阅读说明：本技术 具有形成电容通道的滑环组件的外科轴组件
(Surgical shaft assembly with slip ring assembly forming capacitive channel
) 是由 D·C·耶茨
F·E·谢尔顿四世 于 2018-05-24 设计创作，主要内容包括：外科轴组件包括滑环组件。该滑环组件具有第一连接器、安装在第一连接器上的第一导体以及位于第一导体上的第一防水绝缘层。滑环组件具有能够相对于第一连接器旋转的第二连接器、安装在第二连接器上的第二导体以及位于第二导体上的第二防水绝缘层。滑环组件还具有位于第一防水绝缘层和第二防水绝缘层之间的电介质层。第一导体和第二导体被配置为能够在第一导体和第二导体之间形成电容通道。(The surgical shaft assembly includes a slip ring assembly. The slip ring assembly has a first connector, a first conductor mounted on the first connector, and a first waterproof insulating layer on the first conductor. The slip ring assembly has a second connector rotatable relative to the first connector, a second conductor mounted on the second connector, and a second waterproof insulating layer on the second conductor. The slip ring assembly also has a dielectric layer between the first and second waterproof insulating layers. The first conductor and the second conductor are configured to form a capacitive channel therebetween.)
1. A surgical shaft assembly comprising a slip ring assembly, the slip ring assembly comprising:
a first connector;
a first conductor mounted on the first connector;
a first waterproof insulating layer on the first conductor;
a second connector rotatable relative to the first connector;
a second conductor mounted on the second connector;
a second waterproof insulating layer on the second conductor;
a dielectric layer between the first and second waterproof insulating layers; and is
Wherein the first conductor and the second conductor are configured to form a capacitive channel between the first conductor and the second conductor.
2. The surgical shaft assembly of claim 1, wherein at least one of said first connector and said second connector comprises a slip ring.
3. The surgical shaft assembly of claim 1, wherein said dielectric layer is fixedly attached to said first layer of waterproof insulation.
4. The surgical shaft assembly of claim 1, wherein said dielectric layer comprises PZT.
5. The surgical shaft assembly of claim 1, wherein at least one of said first and second layers of waterproof insulation comprises a lubricious material.
6. The surgical shaft assembly of claim 1 further comprising a control circuit electrically connected to said first conductor.
7. The surgical shaft assembly of claim 6, further comprising an end effector electrically connected to said second conductor, wherein said control circuit is configured to deliver power and signals to said end effector through said capacitive channel.
8. A slip ring assembly for use with a surgical shaft assembly, the slip ring assembly comprising:
a first connector;
a first conductor mounted on the first connector;
a first dielectric layer on the first conductor;
a second connector rotatable relative to the first connector;
a second conductor mounted on the second connector;
a second dielectric layer on the second conductor; and is
Wherein the first conductor and the second conductor are configured to form a capacitive channel between the first conductor and the second conductor.
9. The slip ring assembly of claim 8, further comprising a third dielectric layer on the first dielectric layer.
10. The slip ring assembly of claim 9, wherein the second dielectric layer and the third dielectric layer are spaced apart such that a gap is formed between the second dielectric layer and the third dielectric layer.
11. The slip ring assembly of claim 10, wherein the second dielectric layer comprises vapor deposited PZT.
12. The slip ring assembly of claim 11, wherein the first dielectric layer comprises an epoxy material.
13. The slip ring assembly of claim 12, wherein the third dielectric layer comprises a PZT wafer.
14. The slip ring assembly of claim 8, further comprising a control circuit electrically connected to the first conductor.
15. A surgical shaft assembly, comprising:
a first shaft portion comprising:
a first slip ring;
a plurality of first conductors mounted on the first slip ring; and
a first waterproof insulating layer on the first slip ring;
a second shaft portion rotatable relative to the first shaft portion, wherein the second shaft portion comprises:
a second slip ring;
a plurality of second conductors mounted on the second slip ring;
a second waterproof insulating layer on the second slip ring; and
a dielectric layer between the first and second waterproof insulating layers; and is
Wherein the plurality of first conductors and the plurality of second conductors are configured to enable formation of a plurality of capacitive channels between the plurality of first conductors and the plurality of second conductors.
16. The surgical shaft assembly of claim 15, further comprising a control circuit electrically connected to said plurality of first conductors.
17. The surgical shaft assembly of claim 16, further comprising an end effector electrically connected to said plurality of second conductors, wherein said control circuit is configured to deliver power and signals to said end effector through said plurality of capacitive channels.
18. The surgical shaft assembly of claim 15, wherein said dielectric layer is fixedly attached to said first layer of waterproof insulation.
19. The surgical shaft assembly of claim 15, wherein said dielectric layer comprises PZT.
20. The surgical shaft assembly of claim 15, wherein at least one of said first and second layers of waterproof insulation comprises a lubricious material.
21. A surgical instrument, comprising:
a surgical end effector;
a control circuit; and
a connector assembly, the connector assembly comprising:
a first connector comprising a first conductor electrically coupled to the surgical end effector; and
a second connector comprising a second conductor spaced apart from the first conductor, wherein the second conductor is electrically coupled to the control circuit, wherein the first connector is rotatable relative to the second connector, wherein the first conductor is capacitively coupled to the second conductor, thereby defining a capacitive channel between the first conductor and the second conductor for transmitting electrical signals between the surgical end effector and the control circuit.
22. A surgical instrument, comprising:
a surgical end effector;
an energy source; and
a connector assembly, the connector assembly comprising:
a first connector comprising a first conductor electrically coupled to the surgical end effector; and
a second connector comprising a second conductor spaced apart from the first conductor, wherein the second conductor is electrically coupled to the energy source, wherein the first connector is rotatable relative to the second connector, wherein the first conductor is capacitively coupled to the second conductor, thereby defining a capacitive channel between the first conductor and the second conductor for transmitting energy from the energy source to the surgical end effector.
Technical Field
The present disclosure relates to surgical instruments and, in various instances, to surgical stapling and cutting instruments and staple cartridges therefor that are designed for stapling and cutting tissue.
Background
In motorized surgical stapling and cutting instruments, it may be useful to measure the position and speed of the cutting member in an initial predetermined time or displacement to control the speed. The measurement of position or velocity at an initial predetermined time or displacement may be used to assess tissue thickness and adjust the velocity of the remaining stroke based on this comparison to a threshold value.
While several devices have been developed and used, it is believed that no one prior to the inventors has developed or used a device as described in the appended claims.
Disclosure of Invention
The shaft assembly may be used with a surgical instrument. The shaft assembly defines a longitudinal axis that extends longitudinally through the shaft assembly. The shaft assembly includes a proximal shaft portion including a first sensor and a second sensor. The shaft assembly further includes a distal shaft portion rotatable about the longitudinal axis and relative to the proximal shaft portion. The distal shaft portion includes a housing, a first magnet rotatable with the housing, a clutch assembly rotatable relative to the housing to transition the shaft assembly between an articulation engaged state and an articulation disengaged state, and a second magnet rotatable with the clutch assembly. The shaft assembly further includes a control circuit configured to detect a transition from the articulation engaged state to the articulation disengaged state based on output signals from the first sensor and the second sensor.
The shaft assembly may be used with a surgical instrument. The shaft assembly defines a longitudinal axis that extends longitudinally through the shaft assembly. The shaft assembly includes a proximal shaft portion including a first sensor and a second sensor. The shaft assembly further includes a distal shaft portion rotatable about the longitudinal axis and relative to the proximal shaft portion. The distal shaft portion includes a housing, a first magnet rotatable with the housing, a clutch assembly rotatable relative to the housing to transition the shaft assembly between an articulation engaged state and an articulation disengaged state, and a second magnet rotatable with the clutch assembly. The shaft assembly also includes a control circuit configured to detect a transition from the articulation engaged state to the articulation disengaged state based on a relative rotational position of a distal shaft portion of the shaft assembly and the clutch assembly.
The shaft assembly may be used with a surgical instrument. The shaft assembly defines a longitudinal axis that extends longitudinally through the shaft assembly. The shaft assembly includes a proximal shaft portion including a first sensor configured to generate a first output signal and a second sensor configured to generate a second output signal. The shaft assembly also includes a distal shaft portion. The distal shaft portion includes a clutch assembly rotatable with the distal shaft portion about the longitudinal axis and relative to the proximal shaft portion. The clutch assembly is also rotatable relative to the distal shaft portion to transition the shaft assembly between an articulated engaged state and an articulated disengaged state. The clutch assembly rotates with the distal shaft portion to vary the first output signal. Rotation of the clutch assembly relative to the distal shaft portion varies the second output signal. The shaft assembly further includes a control circuit in electrical communication with the first sensor and the second sensor, wherein the control circuit is configured to detect a change in the second output signal that occurs without a corresponding change in the first output signal, and wherein the detected change indicates a transition between the articulation engaged state and the articulation disengaged state.
The surgical instrument includes a surgical end effector, a control circuit, and a connector assembly. The connector assembly includes a first connector including a first conductor electrically coupled to the surgical end effector, and a second connector including a second conductor spaced apart from the first conductor, wherein the second conductor is electrically coupled to the control circuit, wherein the first connector is rotatable relative to the second connector, wherein the first conductor is capacitively coupled to the second conductor, thereby defining a capacitive channel between the first conductor and the second conductor for transmitting electrical signals between the end effector and the control circuit.
The surgical instrument includes a surgical end effector, an energy source, and a connector assembly. The connector assembly includes a first connector including a first conductor electrically coupled to the surgical end effector, and a second connector including a second conductor spaced apart from the first conductor, wherein the second conductor is electrically coupled to the energy source, wherein the first connector is rotatable relative to the second connector, wherein the first conductor is capacitively coupled to the second conductor, thereby defining a capacitive channel between the first conductor and the second conductor for transmitting energy from the energy source to the end effector.
Drawings
The novel features believed characteristic of the various aspects described herein are set forth with particularity in the appended claims. Various aspects, however, both as to organization and method of operation, may best be understood by reference to the following description taken in conjunction with the accompanying drawings.
Fig. 1 is a perspective view of a surgical instrument having a shaft assembly and an end effector according to one or more aspects of the present disclosure.
Fig. 2 is an exploded assembly view of a portion of the surgical instrument of fig. 1, according to one aspect of the present disclosure.
Fig. 3 is an exploded view of an end effector of the surgical instrument of fig. 1, according to one aspect of the present disclosure.
Fig. 4 is a perspective view of an RF cartridge and an elongate channel adapted for use with the RF cartridge according to one aspect of the present disclosure.
Fig. 5 is an exploded assembly view of portions of the interchangeable shaft assembly of the surgical instrument of fig. 1, according to one aspect of the present disclosure.
FIG. 6 is another exploded assembly view of portions of the interchangeable shaft assembly of FIG. 1, according to one aspect of the present disclosure.
FIG. 7 is a cross-sectional view of a portion of the interchangeable shaft assembly of FIG. 1 according to one aspect of the present disclosure.
FIG. 8 is a perspective view of a portion of the shaft assembly of FIG. 1 with the switch drum omitted for clarity.
FIG. 9 is another perspective view of the interchangeable shaft assembly portion of FIG. 1 with a switch drum mounted thereon.
Fig. 10 is a perspective partial cut-away view of a slip ring assembly according to one aspect of the present disclosure.
Fig. 11 is a cross-sectional view of a portion of the slip ring assembly of fig. 10, according to one aspect of the present disclosure.
Fig. 12 is a cross-sectional view of a portion of a slip ring assembly according to one aspect of the present disclosure.
FIG. 13 is a block diagram of circuitry of a surgical instrument illustrating interfaces between control circuitry, a power source, a slip ring assembly, and an end effector, according to one aspect of the present disclosure.
Detailed Description
The applicant of the present application owns the following U.S. patent applications filed on even date herewith and each incorporated herein by reference in its entirety:
-U.S. patent application serial No. ________ entitled "information STATE DETECTION mechanism sms"; attorney docket number END8176 USNP/170049;
-U.S. patent application serial No. __________ entitled "SURGICAL SHAFT ASSEMBLIES WITH INCREASED CONTACT PRESSURE"; attorney docket number END8177 USNP/170050;
-U.S. patent application Ser. No. __________ entitled "METHOD OF COATING SLIP RINGS"; attorney docket number END8179 USNP/170052M;
-U.S. patent application serial No. __________ entitled "SURGICAL SHAFT ASSEMBLIES WITH WATERTIGHT HOUSINGS"; attorney docket number END8180 USNP/170053; and
-U.S. patent application serial No. __________ entitled "SURGICAL SHAFT ASSEMBLIES WITH FLEXIBLE INTERFACES"; attorney docket number END8223 USNP/170126.
Certain aspects are shown and described to provide an understanding of the structure, function, manufacture, and use of the disclosed apparatus and methods. Features illustrated or described in one example may be combined with features of other examples, and modifications and variations are within the scope of the disclosure.
The terms "proximal" and "distal" are relative to a clinician manipulating a handle of a surgical instrument, where "proximal" refers to a portion closer to the clinician and "distal" refers to a portion further from the clinician. For convenience, the spatial terms "vertical," "horizontal," "upper," and "lower" used with respect to the drawings are not intended to be limiting and/or absolute, as the surgical instrument may be used in many orientations and positions.
The term "comprises" (and any form of "comprising", such as "comprises" and "comprising)", "has" (and "has)", such as "has" and "has)", "contains" (and any form of "containing", such as "comprises" and "containing)", and "containing" (and any form of "containing", such as "containing" and "containing", are open-ended verbs. Thus, a surgical system, device, or apparatus that "comprises," "has," "contains," or "contains" one or more elements possesses those one or more elements, but is not limited to possessing only those one or more elements. Likewise, an element of a system, apparatus, or device that "comprises," "has," "includes," or "contains" one or more features has those one or more features, but is not limited to having only those one or more features.
Exemplary devices and methods are provided for performing laparoscopic and minimally invasive surgical procedures. However, such devices and methods may be used for other surgical procedures and applications, including, for example, open surgical procedures. The surgical instrument may be inserted through a natural orifice or through an incision or puncture formed in tissue. For example, the working or end effector portions of these instruments can be inserted into the body directly or through an access device having a working channel through which the end effector and elongate shaft of the surgical instrument can be advanced.
Fig. 1-9 illustrate a motor-driven surgical instrument 10 for cutting and fastening, which may or may not be reusable. In the illustrated example, the surgical instrument 10 includes a housing 12 including a handle assembly 14 configured to be grasped, manipulated and actuated by a clinician. The housing 12 is configured to be operably attached to an interchangeable shaft assembly 200 having an end effector 300 operably coupled thereto that is configured to perform one or more surgical tasks or procedures. In accordance with the present disclosure, various forms of interchangeable shaft assemblies may be effectively employed in connection with robotically controlled surgical systems. The term "housing" may encompass a housing or similar portion of a robotic system that houses or otherwise operatively supports at least one drive system configured to be capable of generating and applying at least one control motion that may be used to actuate the interchangeable shaft assembly. The term "frame" may refer to a portion of a hand-held surgical instrument. The term "frame" may also refer to a portion of a robotically-controlled surgical instrument and/or a portion of a robotic system that may be used to operably control a surgical instrument. The interchangeable shaft assemblies may be used with various robotic systems, instruments, components and methods disclosed in U.S. patent 9,072,535 entitled "SURGICAL STAPLING INSTRUMENTS WITH ROTATABLE STAPLE DEPLOYMENT ARRANGEMENTS," which is hereby incorporated by reference in its entirety.
Fig. 1 is a perspective view of a surgical instrument 10 having an interchangeable shaft assembly 200 operably coupled thereto according to one aspect of the present disclosure. The housing 12 includes an end effector 300 comprising a surgical cutting and fastening device configured to operatively support a surgical staple cartridge 304 therein. Housing 12 may be configured for use with interchangeable shaft assemblies that include end effectors adapted to support different sizes and types of staple cartridges, having different shaft lengths, sizes, and types. Housing 12 may be used with a variety of interchangeable shaft assemblies, including assemblies configured to apply other motions and forms of energy, such as Radio Frequency (RF) energy, ultrasonic energy, and/or motions, to end effector arrangements suitable for use in connection with various surgical applications and procedures. The end effector, shaft assembly, handle, surgical instrument, and/or surgical instrument system may utilize any suitable fastener or fasteners to fasten tissue. For example, a fastener cartridge including a plurality of fasteners removably stored therein can be removably inserted into and/or attached to an end effector of a shaft assembly.
The handle assembly 14 may include a pair of interconnectable handle housing segments 16, 18 interconnected by screws, snap features, adhesives, or the like. The handle housing sections 16, 18 cooperate to form a pistol grip 19 that can be grasped and manipulated by a clinician. The handle assembly 14 operatively supports a plurality of drive systems configured to be capable of generating and applying control motions to corresponding portions of the interchangeable shaft assembly operatively attached thereto.
Fig. 2 is an exploded assembly view of a portion of the surgical instrument 10 of fig. 1, according to one aspect of the present disclosure. The handle assembly 14 may include a frame 20 that operatively supports a plurality of drive systems. The frame 20 may operatively support a "first" or closure drive system 30 that may impart closing and opening motions to the interchangeable shaft assembly 200. The closure drive system 30 may include an actuator such as a closure trigger 32 pivotally supported by the frame 20. The closure trigger 32 is pivotally coupled to the handle assembly 14 by a pivot pin 33 such that the closure trigger 32 can be manipulated by a clinician. The closure trigger (32) may pivot from a start or "unactuated" position to an "actuated" position and more specifically to a fully compressed or fully actuated position when the clinician grasps the pistol grip portion 19 of the handle assembly 14.
The handle assembly 14 and the frame 20 can operatively support a firing drive system 80 configured to apply firing motions to corresponding portions of the interchangeable shaft assembly attached thereto. The firing drive system 80 may employ an electric motor 82 located in the pistol grip portion 19 of the handle assembly 14. The motor 82 may be a DC brushed motor having a maximum rotational speed of about 25,000 RPM. In other constructions, the motor may include a brushless motor, a cordless motor, a synchronous motor, a stepper motor, or any other suitable electric motor. The electric motor 82 may be powered by a power source 90 that may include a removable power pack 92. The removable battery pack 92 may include a proximal housing portion 94 configured to be attachable to a distal housing portion 96. The proximal housing portion 94 and the distal housing portion 96 are configured to operably support a plurality of batteries 98 therein. Batteries 98 may each include, for example, a Lithium Ion (LI) or other suitable battery. The distal housing portion 96 is configured for removable operative attachment to a control circuit board 100 that is operatively coupled to the electric motor 82. A number of batteries 98 connected in series may power the surgical instrument 10. The power source 90 may be replaceable and/or rechargeable.
The electric motor 82 may include a rotatable shaft (not shown) operatively interfacing with a gear reducer assembly 84 mounted in meshing engagement with drive teeth 122 of a set or rack on the longitudinally movable drive member 120. The longitudinally movable drive member 120 has a rack of drive teeth 122 formed thereon for meshing engagement with the corresponding drive gear 86 of the gear reducer assembly 84.
In use, the polarity of the voltage provided by the power source 90 may operate the electric motor 82 in a clockwise direction, wherein the polarity of the voltage applied by the battery to the electric motor may be reversed to operate the electric motor 82 in a counterclockwise direction. When the electric motor 82 is rotated in one direction, the longitudinally movable drive member 120 will be driven axially in the distal direction "DD". When the electric motor 82 is driven in the opposite rotational direction, the longitudinally movable drive member 120 will be driven axially in the proximal direction "PD". The handle assembly 14 may include a switch that may be configured to enable the polarity applied to the electric motor 82 by the power source 90 to be reversed. The handle assembly 14 may include a sensor configured to detect the position of the longitudinally movable drive member 120 and/or the direction in which the longitudinally movable drive member 120 is moving.
Actuation of the electric motor 82 is controlled by a firing trigger 130 pivotally supported on the handle assembly 14. The firing trigger 130 may be pivotable between an unactuated position and an actuated position.
Turning back to fig. 1, the interchangeable shaft assembly 200 includes an end effector 300 that includes an elongate channel 302 configured to operatively support a surgical staple cartridge 304 therein. The end effector 300 may include an anvil 306 pivotally supported relative to the elongate channel 302. The interchangeable shaft assembly 200 can include an articulation joint 270. The construction and operation of the end effector 300 and ARTICULATION joint 270 is set forth in U.S. patent application publication No. 2014/0263541 entitled ARTICULATABLE SURGICAL INSTRUMENTC PRIMING AN ARTICULATION LOCK, which is incorporated herein by reference in its entirety. The interchangeable shaft assembly 200 can include a proximal housing or nozzle 201 comprised of nozzle portions 202, 203. The interchangeable shaft assembly 200 can include a closure tube 260 extending along a shaft axis SA that can be used to close and/or open the anvil 306 of the end effector 300.
Turning back to FIG. 1, the closure tube 260 is translated distally (direction "DD") to close the anvil 306, for example, in response to actuation of the closure trigger 32, in the manner described in the aforementioned reference U.S. patent application publication 2014/0263541. The anvil 306 is opened by translating the closure tube 260 proximally. In the anvil open position, the closure tube 260 is moved to its proximal position.
Fig. 3 is an exploded view of one aspect of an end effector 300 of the surgical instrument 10 of fig. 1, according to one or more aspects of the present disclosure. The end effector 300 may include an anvil 306 and a surgical staple cartridge 304. In this non-limiting example, an anvil 306 is coupled to the elongate channel 302. For example, an aperture 199 can be defined in the elongate channel 302 that can receive a pin 152 extending from the anvil 306 and allow the anvil 306 to pivot from an open position to a closed position relative to the elongate channel 302 and the surgical staple cartridge 304. The firing bar 172 is configured to translate longitudinally into the end effector 300. The firing bar 172 may be constructed of one solid section or, in various examples, may comprise a laminate material including, for example, a stack of steel plates. The firing bar 172 includes an E-shaped cross beam 178 and a cutting edge 182 at a distal end thereof. In various aspects, the E-beam may be referred to as an I-beam. The distal protruding end of the firing bar 172 may be attached to the E-beam 178 member in any suitable manner and may (among other things) help space the anvil 306 from the surgical staple cartridge 304 positioned in the elongate channel 302 when the anvil 306 is in the closed position. The E-beam 178 can also include a sharp cutting edge 182 that can be used to sever tissue as the E-beam 178 is advanced distally by the firing bar 172. In operation, the E-beam 178 can also actuate or fire the surgical staple cartridge 304. The surgical staple cartridge 304 can comprise a molded cartridge body 194 that holds a plurality of staples 191 disposed on staple drivers 192 located in respective upwardly opening staple cavities 195. The wedge sled 190 is driven distally by the E-beam 178 to slide over the cartridge tray 196, which holds the various components of the surgical staple cartridge 304 together. The wedge sled 190 cams staple drivers 192 upward to extrude staples 191 into deforming contact with the anvil 306 while the cutting edge 182 of the E-beam 178 severs clamped tissue.
The E-beam 178 may include an upper pin 180 that engages the anvil 306 during firing. The E-beam 178 can also include a middle pin 184 and a foot 186 that can engage various portions of the cartridge body 194, the cartridge tray 196, and the elongate channel 302. When the surgical staple cartridge 304 is positioned within the elongate channel 302, the slot 193 defined in the cartridge body 194 can be aligned with the longitudinal slot 197 defined in the cartridge tray 196 and the slot 189 defined in the elongate channel 302. In use, the E-beam 178 can slide through the aligned longitudinal slots 193, 197, and 189, as shown in fig. 3, wherein the foot 186 of the E-beam 178 can engage a groove extending along the bottom surface of the elongate channel 302 along the length of the slot 189, the middle pin 184 can engage the top surface of the cartridge tray 196 along the length of the longitudinal slot 197, and the upper pin 180 can engage the anvil 306. In this instance, the E-beam 178 can separate or limit the relative movement between the anvil 306 and the surgical staple cartridge 304 as the firing bar 172 moves distally to fire the staples from the surgical staple cartridge 304 and/or incise tissue trapped between the anvil 306 and the surgical staple cartridge 304. The firing bar 172 and the E-beam 178 can then be retracted proximally, allowing the anvil 306 to be opened to release the two stapled and severed tissue portions.
Referring to fig. 4, in at least one arrangement, an interchangeable shaft assembly can be used in conjunction with RF staple cartridge 1700 as well as with surgical staple/fastener staple cartridges.
The RF surgical cartridge 1700 comprises a cartridge body 1710, the cartridge body 1710 being sized and shaped to be removably received and supported within the elongate channel 1602. For example, the cartridge body 1710 can be configured to removably remain in snap engagement with the elongate channel 1602. In at least one aspect, the cartridge body 1710 includes a centrally disposed elongate slot 1712, the elongate slot 1712 extending longitudinally through the cartridge body to accommodate the longitudinal travel of the knife therethrough.
The cartridge body 1710 is formed with a centrally disposed raised electrode pad 1720. An elongated slot 1712 extends through the center of the electrode pad 1720 and serves to divide the pad 1720 into a left pad segment 1720L and a right pad segment 1720R. A right flexible circuit assembly 1730R is attached to the right pad segment 1720R and a left flexible circuit assembly 1730L is attached to the left pad segment 1720L. For example, in at least one arrangement, the right flexible circuit 1730R includes a plurality of wires 1732R, the plurality of wires 1732R may include, for example, wider wires/conductors for RF purposes and thinner wires for conventional suture purposes, which are supported or attached or embedded with a right insulator sheath/member 1734R attached to the right pad 1720R. In addition, right flex circuit assembly 1730R includes a "first phase" proximal right electrode 1736R and a "second phase" distal right electrode 1738R. Likewise, the left flexible circuit assembly 1730L includes a plurality of wires 1732L, the plurality of wires 1732L may include, for example, wider wires/conductors for RF purposes and thinner wires for conventional stitching purposes, supported or attached or embedded in a left insulator sheath/member 1734L attached to the left pad 1720L. In addition, left flexible circuit assembly 1730L includes a "first phase" proximal left electrode 1736L and a "second phase" distal left electrode 1738L. Left and right wires 1732L, 1732R are attached to a distal microchip 1740 mounted to the distal end portion of the cartridge body 1710.
The elongate channel 1602 includes a channel circuit 1670 supported in a recess 1621, the recess 1621 extending from a proximal end of the elongate channel 1602 to a distal location 1623 in the elongate channel bottom portion 1620. The channel circuit 1670 includes a proximal contact portion 1672, the proximal contact portion 1672 contacting the distal contact portion 1169 of the flexible shaft circuit strip to make electrical contact therewith. A distal end 1674 of the channel circuit 1670 is received within a corresponding wall recess 1625 formed in one of the channel walls 1622 and is folded over and attached to an upper edge 1627 of the channel wall 1622. A series of corresponding exposed contacts 1676 are provided in the distal end 1674 of the channel circuit 1670. The end of the flexible cartridge circuit 1750 is attached to the distal microchip 1740 and to the distal end portion of the cartridge body 1710. The other end is folded over the edge of the deck surface 1711 and includes bare contacts configured to enable electrical contact with the bare contacts 1676 of the channel circuits 1670. Thus, when the RF cartridge 1700 is installed in the elongate channel 1602, the electrode and distal microchip 1740 are powered and communicate with the on-board circuit board through the contacts between the flexible cartridge circuit 1750, the flexible channel circuit 1670, the flexible shaft circuit, and the slip ring assembly.
Fig. 5 is another exploded assembly view of portions of an interchangeable shaft assembly 200 according to one aspect of the present disclosure. The interchangeable shaft assembly 200 includes a firing member 220 supported for axial travel within the shaft spine 210. The firing member 220 includes an intermediate firing shaft portion 222 that is configured to be attached to a distal portion or rod 280. The intermediate firing shaft 222 can include a longitudinal slot 223 in a distal end thereof that can be configured to receive a tab 284 on a proximal end 282 of the knife bar 280. The longitudinal slot 223 and the proximal end 282 may be sized and configured to allow relative movement therebetween and may include a slip joint 286. The sliding joint 286 can allow the intermediate firing shaft portion 222 of the firing member 220 to move to articulate the end effector 300 without moving, or at least substantially moving, the rod 280. Once the end effector 300 has been properly oriented, the intermediate firing shaft portion 222 can be advanced distally until the proximal side wall of the longitudinal slot 223 comes into contact with the tab 284 in order to advance the distal lever 280. Advancement of the distal lever 280 causes the E-beam 178 to be advanced distally to fire a staple cartridge positioned within the channel 302.
In addition to the above, the shaft assembly 200 includes a clutch assembly 400 that can be configured to selectively and releasably couple the articulation driver 230 to the firing member 220. In one form, the clutch assembly 400 includes a lock collar or lock sleeve 402 positioned about the firing member 220, wherein the lock sleeve 402 is rotatable between an engaged position in which the lock sleeve 402 couples the articulation driver 230 to the firing member 220 and a disengaged position in which the articulation driver 230 is not operably coupled to the firing member 220. When the locking sleeve 402 is in its engaged position, distal movement of the firing member 220 can move the articulation driver 230 distally, and, correspondingly, proximal movement of the firing member 220 can move the articulation driver 230 proximally. When the locking sleeve 402 is in its disengaged position, movement of the firing member 220 is not transmitted to the articulation driver 230; and, thus, the firing member 220 may move independently of the articulation driver 230.
The locking sleeve 402 may include a cylindrical or at least substantially cylindrical body including a longitudinal bore 403 defined therein configured to receive the firing member 220. The locking sleeve 402 may include diametrically opposed, inwardly facing locking projections 404 and outwardly facing locking members 406. The lock protrusion 404 can be configured to selectively engage with the firing member 220. More specifically, when the locking sleeve 402 is in its engaged position, the locking protrusions 404 are located within the drive slots 224 defined in the firing member 220 such that a distal pushing force and/or a proximal pulling force may be transmitted from the firing member 220 to the locking sleeve 402. When the locking sleeve 402 is in its engaged position, the second locking member 406 is received within the drive slot 232 defined in the articulation driver 230 such that a distal pushing force and/or a proximal pulling force applied to the locking sleeve 402 may be transmitted to the articulation driver 230. In fact, when the locking sleeve 402 is in its engaged position, the firing member 220, the locking sleeve 402, and the articulation driver 230 will move together. On the other hand, when the locking sleeve 402 is in its disengaged position, the locking protrusions 404 may not be located within the drive notch 224 of the firing member 220, and thus, the distal pushing force and/or the proximal pulling force may not be transmitted from the firing member 220 to the locking sleeve 402. Accordingly, the distal pushing force and/or the proximal pulling force may not be transmitted to the articulation driver 230. In such circumstances, the firing member 220 can slide proximally and/or distally relative to the locking sleeve 402 and the proximal articulation driver 230.
The shaft assembly 200 also includes a switch drum 500 rotatably received on the closure tube 260. The switching drum 500 includes a hollow shaft segment 502 having a shaft boss 504 formed thereon for receiving the outwardly projecting actuating pin 410 therein. In various circumstances, the actuation pin 410 extends through the slot 267 into a longitudinal slot 408 provided in the locking sleeve 402 to facilitate axial movement of the locking sleeve 402 as it engages the articulation driver 230. The rotary torsion spring 420 is configured to be able to engage a boss 504 on the switch drum 500 and a portion of the nozzle housing 203 as shown in fig. 5 to apply a biasing force to the switch drum 500. Referring to fig. 5 and 6, the switch drum 500 may further include at least partially circumferential openings 506 defined therein, which may be configured to receive circumferential mounts extending from the nozzle halves 202, 203 and allow relative rotation, but not translation, between the switch drum 500 and the proximal nozzle 201. The mount also extends through an opening 266 in the closure tube 260 to be seated in the recess 211 in the spine 210. However, rotation of the nozzle 201 to the point where the mount reaches the end of its corresponding opening 506 in the switch drum 500 will result in rotation of the switch drum 500 about the shaft axis SA-SA. Rotation of the switch drum 500 will ultimately result in rotation of the actuation pin 410 and locking sleeve 402 between their engaged and disengaged positions. Thus, the nozzle 201 may be used to operably engage and disengage an articulation drive system from a firing drive system in a variety of ways as described in further detail in U.S. patent application serial No. 13/803,086.
Shaft assembly 200 can include a slip ring assembly 600, which can be configured to conduct electrical power to and/or from end effector 300, and/or send signals to and/or from end effector 300, for example. Slip ring assembly 600 may include a proximal connector flange 604 mounted to a base flange 242 extending from base 240 and a distal connector flange 601 positioned within a slot defined in nozzle halves 202, 203. The proximal connector flange 604 can comprise a first face and the distal connector flange 601 can comprise a second face, wherein the second face is positioned adjacent to and movable relative to the first face. The distal connector flange 601 is rotatable relative to the proximal connector flange 604 about the shaft axis SA-SA. The proximal connector flange 604 may include a plurality of concentric or at least substantially concentric conductors 602 defined in a first face thereof. The connector 607 may be mounted on the proximal side of the connector flange 601 and may have a plurality of contacts, where each contact corresponds to and makes electrical contact with one of the conductors 602. This configuration allows for relative rotation between the proximal connector flange 604 and the distal connector flange 601 while maintaining electrical contact therebetween. For example, the proximal connector flange 604 may include an electrical connector 606 that may place the conductor 602 in signal communication with a circuit board mounted to the shaft base 240. In at least one example, a wire harness including a plurality of conductors may extend between the electrical connector 606 and the circuit board. U.S. patent application serial No. 13/800,067 entitled "STAPLE CARTRIDGE TISSUE thicknes SENSORSYSTEM," filed on 3, 13, 2013, is incorporated herein by reference in its entirety. U.S. patent application serial No. 13/800,025 entitled "STAPLE CARTRIDGE TISSUE thicknes SENSOR SYSTEM," filed on 3/13/2013, is hereby incorporated by reference in its entirety. More details regarding slip ring assembly 600 may be found in U.S. patent application serial No. 13/803,086.
The interchangeable shaft assembly 200 can include a proximal portion that can be fixedly mounted to the handle assembly 14, and a distal portion that can rotate about a longitudinal axis. The rotatable distal shaft portion may be rotated relative to the proximal portion about the slip ring assembly 600. The distal connector flange 601 of the slip ring assembly 600 may be positioned within the rotatable distal shaft portion. Also, in addition to the above, the switch drum 500 may be positioned within a rotatable distal shaft portion. When the rotatable distal shaft portion is rotated, the distal connector flange 601 and the switch drum 500 may be rotated in synchronization with each other. In addition, the switch drum 500 is rotatable relative to the distal connector flange 601 between a first position and a second position. When the switch drum 500 is in its first position, the articulation drive system may be operably disengaged from the firing drive system and, as a result, operation of the firing drive system may not articulate the end effector 300 of the shaft assembly 200. When the switch drum 500 is in its second position, the articulation drive system can be operably engaged with the firing drive system such that operation of the firing drive system can articulate the end effector 300 of the shaft assembly 200. When the switch drum 500 is moved between its first position and its second position, the switch drum 500 moves relative to the distal connector flange 601.
In various examples, the shaft assembly 200 can include at least one sensor configured to detect a position of the switch drum 500. The distal connector flange 601 may include, for example, a hall effect sensor 605, and the switch drum 500 may include, for example, a magnetic element such as permanent magnet 505. The hall effect sensor 605 may be configured to detect the position of the permanent magnet 505. The permanent magnet 505 may move relative to the hall effect sensor 605 when the switch drum 500 is rotated between its first position and its second position. In various examples, the hall effect sensor 605 can detect a change in the magnetic field generated when the permanent magnet 505 moves. The hall effect sensor 605 may be in signal communication with a control circuit, for example. Based on the signal from the hall effect sensor 605, a microcontroller on the control circuit can determine whether the articulation drive system is engaged or disengaged from the firing drive system.
By using a universal wire to transmit power and signals between the fixed shaft portion and the rotatable shaft portion of the shaft assembly, the surgical instrument may not be able to effectively use the rotatable shaft assembly because the wire may become twisted or even damaged due to repeated rotation of the shaft assembly. One way to overcome this drawback may be to use a ring assembly instead of wires to transmit power and signals to the rotatable shaft portion. For example, a first flange having an electrode may be attached to the fixed shaft portion, and a second flange having an electrode may be rotatable relative to the electrode of the first flange. A gap must be formed between the first flange and the second flange to allow the second flange to rotate relative to the first flange. In order to maintain the electrical connection during rotation of the rotatable shaft portion, the electrodes of the first and second flanges may be exposed at an interface therebetween. The gap may allow water and/or other bodily fluids to enter the region between the first flange and the second flange where the electrode interface is located. As a result, the electrode interface may be exposed to water and other bodily fluids during surgery. Upon contacting the exposed electrodes, water and/or bodily fluids may cause signal noise or even loss of power/signal.
Aspects of the present disclosure improve a slip ring assembly in a surgical instrument that is exposed to water and/or bodily fluids during operation thereof. In one arrangement, the shaft assembly can include a proximal shaft portion configured to be fixedly connected to the surgical instrument body and a distal shaft portion configured to rotate relative to the proximal shaft portion. The slip ring assembly may include a proximal slip ring in the proximal shaft portion and a distal slip ring in the shaft distal portion. Each of the proximal and distal slip rings may include one or more conductors mounted on each of the proximal and distal slip rings. The conductors on the proximal and distal slip rings may be coated with a waterproof insulating layer to provide a waterproof barrier to prevent water or fluids that may be generated during surgery from reaching the conductors. A dielectric layer (e.g., a high-k dielectric, such as PZT) may be located between the conductors on the proximal and distal slip rings, and the conductors of the proximal and distal slip rings may form a capacitive path therebetween. These capacitive channels may be used to transfer power and signals from the fixed body portion to the rotatable shaft assembly portion (e.g., end effector) using capacitive coupling.
As such, aspects of the present disclosure may advantageously cover the conductors with a waterproof insulation layer by forming a capacitive channel between the conductors in the distal and proximal slip rings rather than a direct connection, which may necessarily expose some portions of the electrodes to the outside. Accordingly, aspects of the present disclosure may prevent signal noise and loss of power and signal by providing an insulating barrier to prevent water or fluid from reaching the electrodes.
Fig. 10 illustrates a perspective partial cut-away view of a slip ring assembly 2000 in accordance with an aspect of the present disclosure, and fig. 11 illustrates a cut-away view of a portion of the slip ring assembly 2000 of fig. 10 in accordance with an aspect of the present disclosure. The slip ring assembly 2000 may be included in a shaft assembly (e.g., shaft assembly 200). Slip ring assembly 2000 may be configured to conduct electrical power to and/or from an end effector (e.g., end effector 300) and/or transmit signals to and/or from an end effector. The slip ring assembly may include a proximal portion 2172 and a distal portion 2174. The proximal portion 2172 can be fixedly connected to a body of a surgical instrument (e.g., the surgical instrument 10) (e.g., the base flange 242 of the proximal shaft portion of the handle assembly 14 or shaft assembly). The distal portion 2174 can be fixedly attached to the distal shaft portion of the shaft assembly. The distal portion 2174 may rotate relative to the proximal portion 2172, e.g., about a longitudinal axis. As shown in fig. 10 and 11, the slip ring assembly 2000 may include a proximal slip ring 2010 and one or more conductors 2020 mounted on the proximal slip ring 2010. Proximal slip ring 2010 and conductor 2020 in proximal portion 2172 may be coated with a first layer of waterproof insulation 2030 to provide a waterproof barrier to prevent water or fluids that may be generated during surgery from reaching conductor 2020. In an exemplary aspect, the first waterproof insulating layer 2030 may cover the entire conductor 2020.
In distal portion 2174, slip ring assembly 2000 may further include a distal slip ring 2110 and one or more conductors 2120 mounted on distal slip ring 2110. The distal slip ring 2110 and conductor 2120 in distal portion 2174 may be coated with a second waterproof insulation layer 2130 to provide a waterproof barrier to prevent water or fluid from reaching the conductor 2120. In an exemplary aspect, the second waterproof insulating layer 2130 can cover the entire conductor 2120. In an exemplary aspect, the first and second waterproof insulating layers 2030 and 2130 can comprise an electrically insulating and waterproof material. In an exemplary aspect, the first and second waterproof insulating layers 2030 and 2130 can also comprise a lubricious material.
Proximal and distal slip rings 2010, 2110 can be positioned within slots defined in nozzle halves (e.g., nozzle halves 202, 203). In an exemplary aspect, the proximal and distal slip rings 2010, 2110 can be fabricated or coated from a non-conductive material. Distal slide ring 2110 is rotatable about shaft axis SA-SA relative to proximal slide ring 2010.
In an example aspect, dielectric layer 2050 can be located between first waterproof insulating layer 2030 and second waterproof insulating layer 2130. In an exemplary aspect, dielectric layer 2050 can be fixedly connected to first waterproof insulation layer 2030 in proximal portion 2172. In an exemplary aspect, dielectric layer 2050 may be in direct contact with second waterproof insulation layer 2130, and second waterproof insulation layer 2130 may comprise a lubricious material such that distal portion 2174 (e.g., distal slip ring 2110 and second waterproof insulation layer 2130) rotates smoothly relative to dielectric layer 2050 with less friction with the contact surfaces of dielectric layer 2050. In another example aspect, an air gap may exist between the dielectric layer 2050 and the second water resistant insulating layer 2130.
In another exemplary aspect, the dielectric layer 2050 can be fixedly attached to the second waterproof insulation layer 2130 in the distal portion 2174. In such a case, in an example aspect, dielectric layer 2050 can be in direct contact with first waterproof insulation 2030, and first waterproof insulation 2030 can comprise a lubricious material such that distal portion 2174 (e.g., distal slip ring 2110 and dielectric layer 2050) smoothly rotates relative to first waterproof insulation 2030 with less friction with the contact surfaces of first waterproof insulation 2030. In another exemplary aspect, an air gap may exist between dielectric layer 2050 and first waterproof insulating layer 2030.
In another exemplary aspect, dielectric layer 2050 can be free of both first and second waterproof insulating layers 2030, 2130, e.g., by being fixedly attached to another component of the surgical instrument (e.g., nozzle halves 202, 203). In this case, dielectric layer 2050 may directly contact at least one of first waterproof insulation layer 2030 and second waterproof insulation layer 2130, and at least one of first waterproof insulation layer 2030 and second waterproof insulation layer 2130 may comprise a lubricious material such that distal portion 2174 (e.g., distal slip ring 2110 and second waterproof insulation layer 2130) smoothly rotates relative to dielectric layer 2050 with less friction. In another exemplary aspect, an air gap may exist between dielectric layer 2050 and first water resistant insulating layer 2030 and/or between dielectric layer 2050 and second water resistant insulating layer 2130.
In an exemplary aspect, the thickness 2025 of conductor 2020 (or conductor 2120) may be in the range of about 0.001 inches to about 0.01 inches, preferably in the range of about 0.003 inches to about 0.008 inches, and more preferably in the range of about 0.004 inches to about 0.006 inches. In another example aspect, the conductors 2020, 2120 may have any other suitable thickness. In an exemplary aspect, vertical distance 2035 between conductor 2020 and dielectric layer 2050 can be very small, for example in the range of about 0.0005 inches to about 0.0015 inches, preferably in the range of about 0.0007 inches to about 0.0013 inches, and more preferably in the range of about 0.0009 inches to about 0.0011 inches. In another example aspect, conductor 2020 and dielectric layer 2050 may have any other suitable distance. In an exemplary aspect, the vertical distance between conductor 2120 and dielectric layer 2050 may be similar to vertical distance 2035. In an exemplary aspect, the thickness 2055 of the dielectric layer 2050 can be very thin, such as in a range from about 0.001 inches to about 0.05 inches, preferably in a range from about 0.005 inches to about 0.03 inches, and more preferably in a range from about 0.01 inches to about 0.02 inches. In another example aspect, dielectric layer 2050 may have any other suitable thickness.
The proximal slip ring 2010 can be fixedly connected to a body of a surgical instrument. For example, the conductors 2020 of the proximal slip ring 2010 and the proximal slip ring 2010 may be connected to the shaft circuit board 2070 (e.g., the shaft circuit board 610) by a first electrical connector 2060 (e.g., electrical connector 606) as shown in fig. 10. Circuit board 2070 may include control circuitry 2080 (e.g., a microchip or microprocessor) configured to control power and signals delivered to an end effector (e.g., end effector 300). The distal slip ring 2110 and the conductors 2120 of the distal slip ring 2110 may be connected to the end effector by a second electrical connector 2160.
Conductor 2020 of proximal slip ring 2010 and conductor 2120 of distal slip ring 2110 may form a capacitive path between conductor 2020 and conductor 2120. The control circuitry 2080 can be configured to transmit power and signals (e.g., data or any other signals) to an end effector electrically connected to the distal slip ring 2110 using capacitive coupling through capacitive channels. The control circuit may use the AC current to transfer power and signals to and/or from the end effector.
In one exemplary aspect, the first and second slip rings 2010, 2110 can be annular in shape, as shown in fig. 10. In another exemplary aspect, the first and second slip rings 2010, 2110 can have any other suitable shape. In an example aspect, the conductors 2020, 2120 may comprise metal electrodes. In another exemplary aspect, the conductors 2020, 2120 may comprise any other conductive material. In an example aspect, each of the conductors 2020 on the proximal slip ring 2010 may be mated with one of the conductors 2120 on the distal slip ring 2110, and the mated conductors may face each other. For example, as shown in fig. 11, conductor 2020A mates with conductor 2120A, and conductor 2020B mates with conductor 2120B. In an exemplary aspect, the conductors 2020, 2120 may be concentric circular in shape, as shown in fig. 10, such that the mating conductors (e.g., 2020A-2120A; 2020B-2120B) may continue to face each other as the distal portion 2174 of the slip ring assembly 2000 is rotated, thereby continuously maintaining the capacitive channel formed between the conductor 2020 and the conductor 2120. In another example aspect, the conductors 2020, 2120 may have any other suitable shape.
In an exemplary aspect, dielectric layer 2050 can comprise a high-k dielectric material, such as PZT (lead zirconate titanate), titanium oxide (TiO)2) Tantalum oxide (Ta)2O5) Cerium oxide (CeO)2) And alumina (Al)2O3). These materials may be used alone or in any combination thereof. As used herein, a high-k dielectric material may refer to a dielectric material having a high dielectric constant value k, e.g., a k value greater than that of silicon dioxide, which is about 3.9. In one example aspect, dielectric layer 2050 may comprise a dielectric material having a very high dielectric constant (e.g., greater than about 100 to about 300), such as PZT. By using a dielectric material having a very high dielectric constant, the capacitive channel formed in the slip ring assembly 2000 may be able to have sufficient capacitance while keeping the thickness of the dielectric layer 2050 very thin (e.g., less than 0.03 to 0.05 inches) without suffering unacceptable levels of leakage current or catastrophic breakdown. In another example aspect, dielectric layer 2050 may comprise any other suitable dielectric material (e.g., a medium to low dielectric constant material such as silicon dioxide). In an example, dielectric layer 2050 can be deposited on first waterproof insulating layer 2030 or second waterproof insulating layerOn one of the slip rings above the water insulation layer 2130 (e.g., vapor deposition). In an example, dielectric layer 2050 may be provided as a disk or wafer layer.
In an example aspect, only one of the slip rings 2010, 2110 can include a waterproof insulating layer. For example, if conductors 2120 on distal slip ring 2110 and distal slip ring 2110 are coated with a waterproof insulating layer, conductors 2020 on proximal slip ring 2010 and proximal slip ring 2010 may be directly coated with dielectric layer 2050 (e.g., vapor deposition of a dielectric material) without a separate waterproof insulating layer therebetween. In this case, dielectric layer 2050 may be waterproof and prevent water or fluid from reaching conductor 2020. In another example aspect, if the conductors 2020 on the proximal slip ring 2010 and the proximal slip ring 2010 are coated with a waterproof insulating layer, the conductors 2120 on the distal slip ring 2110 and the distal slip ring 2110 may be directly coated with a dielectric layer 2050 (e.g., vapor deposition of a dielectric material) without a separate waterproof insulating layer therebetween.
Fig. 12 is a cross-sectional view of a portion of a slip ring assembly 2200 in accordance with another aspect of the present disclosure. The slip ring assembly 2200 may be included in a shaft assembly (e.g., the shaft assembly 200). The slip ring assembly 2200 may have a proximal portion 2372 and a distal portion 2374. The proximal portion 2372 can be fixedly connected to a body (e.g., handle assembly 14) of a surgical instrument (e.g., surgical instrument 10). The distal portion 2374 can be rotatable relative to the proximal portion 2372. As shown in fig. 12, the slip ring assembly 2200 may include a proximal slip ring 2210 and one or more conductors 2220 mounted on the proximal slip ring 2210 in a proximal portion 2372. The proximal slip ring 2210 and the conductor 2220 may be coated with a first dielectric layer 2230. In an example aspect, the first dielectric layer can cover the entire conductor 2220. First dielectric layer 2230 may provide a water resistant barrier to prevent water or fluids that may be generated during surgery from reaching conductor 2220.
In an exemplary aspect, the slip ring assembly 2200 may further include a distal slip ring 2310 and one or more conductors 2320 mounted on the distal slip ring 2310 in the distal portion 2374. The distal slip ring 2310 and the conductor 2320 may be coated with a second dielectric layer 2350. In an example aspect, the second dielectric layer 2350 can cover the entire conductor 2320. The second dielectric layer 2350 may provide a water resistant barrier to prevent water or fluids that may be generated during a surgical procedure from reaching the conductor 2320. Conductors 2220, 2320 may form a capacitive path between conductor 2220 and conductor 2320.
In an example aspect, the first dielectric layer 2230 and the second dielectric layer 2350 can include a high-k dielectric material, such as PZT (lead zirconate titanate), titanium oxide (TiO)2) Tantalum oxide (Ta)2O5) Cerium oxide (CeO)2) Alumina (Al)2O3) Or an epoxy material having a high k value (e.g., having a dielectric constant greater than 3.9). These materials may be used alone or in any combination thereof. In an example aspect, at least one of the first dielectric layer 2230 and the second dielectric layer 2350 can comprise a dielectric material having a very high dielectric constant (e.g., greater than about 100 to about 300), such as PZT. In another example aspect, the first dielectric layer 2230 and the second dielectric layer 2350 can comprise any other suitable dielectric material (e.g., a medium to low dielectric constant material, such as silicon dioxide).
In an example aspect, the first dielectric layer 2230 can include a different dielectric material than the second dielectric layer 2350. For example, the first dielectric layer 2230 can comprise an epoxy material, while the second dielectric layer 2350 comprises titanium oxide or PZT (e.g., a vapor deposited dielectric layer). In another example aspect, the first dielectric layer 2230 can comprise the same dielectric material as the second dielectric layer 2350.
In an example aspect, the slip ring assembly 2200 may include a third dielectric layer 2250 that may be fixedly attached to the first dielectric layer 2230. For example, the dielectric disk/wafer may be glued onto first dielectric layer 2230, or a dielectric layer vapor deposited on first dielectric layer 2230. In such a case, in an example, an air gap 2360 may be present between the second dielectric layer 2350 and the third dielectric layer 2250 to facilitate smooth rotation of the distal portion 2374 relative to the third dielectric layer 2250. In another example aspect, there may be no air gap between the second dielectric layer 2350 and the third dielectric layer 2250, and a smooth insulating layer may be coated on the second dielectric layer 2350 or on the third dielectric layer 2250.
In another example aspect, the third dielectric layer 2250 may be fixedly attachable on the second dielectric layer 2350. In such a case, in an example, an air gap may exist between first dielectric layer 2230 and third dielectric layer 2250 to facilitate smooth rotation of distal portion 2374, including third dielectric layer 2250, relative to first dielectric layer 2230. In another example aspect, there may be no air gap between first dielectric layer 2230 and third dielectric layer 2250, and a smooth insulating layer may be coated on first dielectric layer 2230 or on third dielectric layer 2250.
In another example aspect, the third dielectric layer 2250 may be devoid of both the first dielectric layer 2230 and the second dielectric layer 2350, such as by being capable of being fixedly connected to another component of the surgical instrument (e.g., the nozzle half 202, 203). In such a case, in an example, an air gap may exist between at least one of the third dielectric layer 2250, the first dielectric layer 2230, and the second dielectric layer 2350. In another example aspect, there may be no air gaps, and instead, a smooth insulating layer may be present between at least one of third dielectric layer 2250, first dielectric layer 2230, and second dielectric layer 2350.
In an exemplary aspect, third dielectric layer 2250 may comprise a high-k dielectric material, such as, for example, PZT (lead zirconate titanate), titanium oxide (TiO), or the like2) Tantalum oxide (Ta)2O5) Cerium oxide (CeO)2) Alumina (Al)2O3) Or an epoxy material having a high k value (e.g., having a dielectric constant greater than 3.9). These materials may be used alone or in any combination thereof. In an exemplary aspect, third dielectric layer 2250 may comprise a dielectric material having a very high dielectric constant (e.g., greater than about 100 to about 300), such as PZT. In another example aspect, the third dielectric layer 2250 may comprise any other suitable node material (e.g., a medium to low dielectric constant material such as silicon dioxide).
In an example aspect, the dielectric constant of the second dielectric layer 2350 and/or the third dielectric layer 2250 may be greater than the dielectric constant of the first dielectric layer 2230. In another example aspect, the dielectric constant of the first dielectric layer 2230 may be greater than the dielectric constant of the second dielectric layer 2350 and/or the third dielectric layer 2250. In an example aspect, the third dielectric layer 2250 may comprise a different dielectric material than the second dielectric layer 2350. In another example aspect, the third dielectric layer 2250 may comprise the same dielectric material as the second dielectric layer 2350.
In an exemplary aspect, thickness 2225 of conductor 2220 and/or thickness 2325 of conductor 2320 may be in the range of about 0.001 inches to about 0.01 inches, preferably in the range of about 0.003 inches to about 0.008 inches, and more preferably in the range of about 0.004 inches to about 0.006 inches. In another example aspect, conductors 2220, 2320 may have any other suitable thickness. In an exemplary aspect, the thickness 2355 of the second dielectric layer 2350 can be in the range of about 0.001 inch to about 0.01 inch, preferably in the range of about 0.002 inch to about 0.005 inch, and more preferably in the range of about 0.003 inch to about 0.004 inch. In another example aspect, the second dielectric layer 2350 can have any other suitable thickness. In an exemplary aspect, the air gap 2260 (or any other air gap discussed herein) between the third dielectric layer 2250 and the second dielectric layer 2350 may be very thin, e.g., less than 0.01 inches, preferably less than 0.005 inches, and more preferably less than 0.001 inches. In another example aspect, the air gap 2260 may have any other suitable distance.
In an exemplary aspect, vertical distance 2235 between conductor 2220 and third dielectric layer 2250 may be very small, for example, in the range of about 0.0005 inches to about 0.0015 inches, preferably in the range of about 0.0007 inches to about 0.0013 inches, and more preferably in the range of about 0.0009 inches to about 0.0011 inches. In another example aspect, conductor 2220 and third dielectric layer 2250 may have any other suitable distance. In an exemplary aspect, thickness 2255 of third dielectric layer 2250 may be very thin, such as in the range of about 0.001 inches to about 0.01 inches, preferably in the range of about 0.002 inches to about 0.007 inches, and more preferably in the range of about 0.003 inches to about 0.005 inches. In another example aspect, third dielectric layer 2250 may have any other suitable thickness.
The remaining features and characteristics of the slip ring assembly 2200 shown and described with respect to fig. 12 (with the conductors 2220, 2320 mounted on the slip rings 2210, 2310) may be otherwise similar or identical to those described with the embodiments shown in fig. 10-11, including, but not limited to, the components, arrangement, and shape of any of the slip rings 2210, 2310 or the conductors 2220, 2320, as well as the possible presence of the electrical connectors 2060, 2160, shaft circuit board 2070, control circuit 2080 as described and shown herein.
Fig. 13 illustrates a block diagram of circuitry of a surgical instrument showing an interface between control circuitry 2410 (e.g., control circuitry 2080), power source 2420 (e.g., power source 90), slip ring assembly 2450 (e.g., slip ring assemblies 2000, 2200), and end effector 2430 (e.g., end effector 300), according to one aspect of the present disclosure. As shown in fig. 13, the slip ring assembly 2450 can include one or more capacitive channels 2440A-C formed by conductors on the proximal and distal slip rings. Control circuit 2410 may be configured to deliver power and signals to end effector 2430 using capacitive coupling through capacitive channels 2440A-C.
In an example aspect, each capacitive channel 2440A-C can receive/transmit a different type of signal/power. For example, the control circuit 2410 may use a first capacitive path 2440A for a first signal or data, a second capacitive path 2440B for a second signal or data, and a third capacitive path 2440C for power. In another example embodiment, the control circuitry 2410 may use the same capacitive channel to receive/transmit different types of signals/power. For example, the first capacitive path 2440A may be used for both receive/transmit power and signals.
The foregoing description has set forth various aspects of the devices and/or processes via the use of block diagrams, flowcharts, and/or examples, which may include one or more functions and/or operations. Each function and/or operation within such block diagrams, flowcharts, or examples may be implemented, individually and/or collectively, by a wide variety of hardware, software, firmware, or virtually any combination thereof. In one aspect, portions of the subject matter described herein may be implemented via Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), Digital Signal Processors (DSPs), Programmable Logic Devices (PLDs), circuits, registers, and/or software components (e.g., programs, subroutines, logic) and/or a combination of hardware and software components, logic gates, or other integrated formats. Aspects disclosed herein may be equivalently implemented in integrated circuits, in whole or in part, as one or more computer programs running on one or more computers (e.g., as one or more programs running on one or more computer systems), as one or more programs running on one or more processors (e.g., as one or more programs running on one or more microprocessors), as firmware, or as virtually any combination thereof, and designing the circuitry and/or writing the code for the software and/or hardware would be well within the skill of one of skill in the art in light of the present disclosure.
The mechanisms of the subject matter disclosed herein are capable of being distributed as a program product in a variety of forms, and exemplary aspects of the subject matter described herein apply regardless of the particular type of signal bearing media used to actually carry out the distribution. Examples of signal bearing media include the following: recordable media such as floppy disks, hard disk drives, Compact Disks (CDs), Digital Video Disks (DVDs), digital tapes, computer memory, etc.; and a transmission-type medium such as a digital and/or analog communication medium (e.g., a fiber optic cable, a waveguide, a wired communications link, a wireless communication link (e.g., transmitter, receiver, transmission logic, reception logic), etc.).
The foregoing description of these aspects has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. Modifications or variations are possible in light of the above teachings. The aspects were chosen and described in order to explain the principles of the invention and its practical application to enable one skilled in the art to utilize the invention in various aspects and with various modifications as are suited to the particular use contemplated. The claims as filed herewith are intended to define the full scope.
Various aspects of the subject matter described herein are set forth in the following numbered examples:
