阅读说明：本技术 用于在超声乳化仪器机头上安装和拆卸空心针的装置 (Device for mounting and dismounting hollow needle on ultrasonic emulsification instrument handpiece ) 是由 迪特里希·维尔茨 于 2020-02-19 设计创作，主要内容包括：用于在超声乳化仪器机头(14)上安装空心针(12)或从超声乳化仪器机头(14)上拆卸空心针(12)的装置(10)包括具有扭矩限制和止回耦合器(34)的壳体(16)。耦合器(34)在两个耦合面(36)、(38)上配备有对应的耦合释放突起(58)和耦合凹部(56)。所述耦合面(36、38)还具有对应的止回突起(62)和止回凹部(60)。耦合器(34)由驱动部件(32)和旋转轴(18)构成,所述旋转轴具有插接端(22)用于插接到待安装和拆卸的空心针(12)上。(An apparatus (10) for mounting a hollow needle (12) on a phacoemulsification instrument handpiece (14) or removing a hollow needle (12) from a phacoemulsification instrument handpiece (14) includes a housing (16) having a torque limiting and non-return coupler (34). The coupler (34) is provided with corresponding coupling release protrusions (58) and coupling recesses (56) on both coupling faces (36), (38). The coupling surfaces (36, 38) also have corresponding non-return projections (62) and non-return recesses (60). The coupling (34) is formed by a drive part (32) and a rotary shaft (18) having a plug end (22) for plugging onto a hollow needle (12) to be mounted and dismounted.)

1. A device for mounting and dismounting a hollow needle on and from a phacoemulsification machine head, having

A manually operated housing (16),

-a rotation shaft (18) rotatably supported in the housing (16) having a plugging end (22) extending outwardly from an opening (20) of the housing (16) for plugging onto the hollow needle (12), wherein the plugging end (22) has an internal engagement protrusion (24) for engaging with a groove (30) on the outside of the hollow needle for rotating the hollow needle (12) together when the housing (16) is manually rotated,

-a torque limiting and non-return coupling (34) having a contact surface (40) arranged at the rotary shaft (18) as a first coupling surface (36), and

-a drive component (32) arranged coaxially to a rotational shaft (18) in the housing (16), which drive component is coupled with the housing (16) and has a contact face (42) as a second coupling face (38) of the torque-limiting and non-return coupling (34),

-wherein the two coupling surfaces (36, 38) bear against each other with an elastic pretension,

one of the coupling surfaces (38) has at least one coupling-release projection (58) and the other coupling surface (36) has at least one coupling recess (56) which is complementary to the shape of the coupling-release projection (58),

one of the coupling surfaces (38) has at least one non-return projection (62) and the other coupling surface (38) has at least one non-return recess,

-wherein the at least one non-return recess (60), viewed in the circumferential direction of a circular line concentric with the axis of the rotating shaft (18), has a greater extension, in particular a greater than twice extension, than the extension of a non-return protrusion (62) in the circumferential direction of the circular line,

-wherein the at least one non-return projection (62) rests on one of the two ends of the non-return recess (60) that are arranged as seen in the circumferential direction of the circular line when the at least one coupling-release projection (58) enters into the at least one coupling recess (56),

-wherein the height of at least one non-return protrusion (62) is smaller than the height of the at least one coupling-release protrusion (58), seen in the axial extension of the rotating shaft (18), and

-wherein the at least one non-return projection (62) is completely moved out of the at least one non-return recess (60) when the at least one coupling-release projection (58) is moved out of the at least one coupling recess (56) and over or on the coupling face (38) with the non-return recess (60) until the at least one coupling-release projection (58) reenters the at least one coupling recess (56) upon continued rotation of the housing (16).

2. The device according to claim 1, characterized in that the one coupling face (38) has a plurality of coupling release protrusions (58) and the other coupling face (36) has the same number of coupling recesses (56) as the number of coupling release protrusions (58) or has a number of coupling recesses (56) 2 times or 3 times or more the number of coupling release protrusions (58), wherein the relative arrangement of the coupling recesses (56) equal to the number of coupling release protrusions (58) is the same as the relative arrangement of the coupling release protrusions (58).

3. Device according to claim 1 or 2, characterized in that the one coupling face (36) has a greater number of non-return recesses (60) than the non-return projections (62) arranged on the other coupling face (38).

4. Device according to claim 2 or 3, characterized in that the number of non-return recesses (60) is equal to the number of non-return projections (62) or 2 or 3 or more times the number of non-return projections.

5. The device according to one of claims 1 to 4, characterized in that the one coupling surface (38) has three coupling-release projections (58) which are arranged offset by 120 ° from one another, respectively, and the other coupling surface (36) has six coupling recesses (56) which are arranged offset by 60 ° from one another, respectively, and the one coupling surface (38) has three non-return projections (62) which are arranged offset by 120 ° from one another, respectively, and the other coupling surface (36) has six non-return recesses (60) which are arranged offset by 60 ° from one another, respectively, wherein each non-return recess (60) is arranged in line with the center between two coupling recesses (56).

6. Device according to any one of claims 1 to 5, characterized in that at least one or each coupling-release protrusion (58) and at least one or each coupling-release recess (56) are arranged on a first circular line concentric to the rotation axis (18), and at least one or each non-return protrusion (62) and at least one or each non-return recess (60) are arranged on a second circular line concentric to the rotation axis (18) and different from the first circular line.

7. The device according to one of claims 1 to 6, characterized in that a rotary shaft (18) in the housing (16) is rotatably supported by means of bearing bushes (46, 48, 50) and/or the rotary shaft (18) extends through the drive part (32) and/or a helical compression spring (44) is arranged concentrically on the rotary shaft (18), the helical compression spring (44) extending and supporting between a support face in the housing (16) and a support face on the rotary shaft (18).

8. Device according to one of claims 1 to 7, characterized in that at least one or each engaging protrusion (24) and/or at least one or each coupling-releasing protrusion (58) is configured as a ball, and/or at least one or each non-return protrusion (62) and at least one or each non-return recess (60) have contact faces at right angles or substantially at right angles to the coupling faces (36, 38), which contact faces abut against one another when the at least one coupling-releasing protrusion (58) enters into the at least one coupling recess (56).

Technical Field

The present invention relates to a device for mounting a hollow needle on a phacoemulsification machine head and for removing the hollow needle from the phacoemulsification machine head. Such a surgical instrument may be, for example, a phacoemulsification handpiece, a sonotrode handpiece, or a combined sonotrode/aspirator handpiece.

Background

In ophthalmology, surgical instruments are used for treating the crystalline lens, which have a phacoemulsification handpiece with a hollow needle that rotates with the handpiece. It is known to screw a hollow needle onto a handpiece by means of a manually operated tool that limits the torque. As examples of this prior art reference is made to CN-A-108992744, WO-A-2011/149727, US-A-2009/157009 and US-A-2014/0100515. The torque-limiting tools described in these two documents are very complex in construction.

Disclosure of Invention

The object of the invention is to provide a device for mounting a hollow needle on a phacoemulsification machine head and for removing the hollow needle from the phacoemulsification machine head, which is simple to implement and has no torque limitation for removing the hollow needle from the phacoemulsification machine head.

In order to solve this task, the invention proposes a device for mounting and dismounting a hollow needle on and from a phacoemulsification instrument handpiece, said device being equipped with

-a housing for manual operation of the device,

-a rotation shaft rotatably supported in a housing, the rotation shaft having a plugging end extending outwardly from an opening of the housing for plugging onto the hollow needle, wherein the plugging end has an internal engagement protrusion for engaging with a groove on an outer side of the hollow needle for rotating the hollow needle together when the housing is manually rotated,

a torque-limiting and non-return coupling having a contact surface arranged at the axis of rotation as a first coupling surface, and

a drive part arranged coaxially to the rotational axis in the housing, the drive part being coupled with the housing and having a radial contact surface as a second coupling surface of the torque limiting and no-return coupling,

wherein the two coupling surfaces bear elastically against one another with a mutual pretension,

one of the coupling surfaces has at least one coupling-release projection and the other coupling surface has at least one coupling recess which is complementary in shape to the coupling-release projection,

one of the coupling surfaces has at least one non-return projection and the other coupling surface has at least one non-return recess,

-wherein the at least one non-return recess-viewed in the circumferential direction of a circular line concentric with the axis of the rotary shaft-has a greater extension, in particular a greater than twice extension, than the extension of the non-return protrusion in the circumferential direction of said circular line,

wherein the at least one non-return projection rests on one of the two ends of the non-return recess, which are arranged, viewed in the circumferential direction of the circular line, when the at least one coupling-release projection enters the at least one coupling recess,

-wherein the height of the at least one non-return projection, viewed in the axial extension of the rotating shaft, is smaller than the height of the at least one coupling-release projection, and

wherein the at least one non-return projection is completely moved out of the at least one non-return recess when the at least one coupling release projection is moved out of the at least one coupling recess and over or on the coupling face with the non-return recess until the at least one coupling release projection again enters into the at least one coupling recess upon continued rotation of the housing.

The invention therefore proposes a device having a manually operable housing which is to be gripped by the fingers of a hand and in which a rotary shaft is rotatably mounted. Furthermore, a drive member is arranged in the housing, which drive member may be part of the housing or may be a separate component from the housing. When the housing is rotated by hand, the drive member rotates together with the housing. Between the drive part and the rotary shaft there is a torque-limiting and non-return coupling with two coupling surfaces which are elastically pressed against one another. One of the coupling surfaces is located on the axis of rotation and the other coupling surface is located on the drive member. Typically, both coupling surfaces are embodied as radial contact surfaces extending radially with respect to the axis of rotation.

The rotary shaft also has a plug end which leads out of an opening of the housing and which forms an accommodating recess which is plugged onto the hollow needle when the hollow needle is to be mounted or dismounted. The hollow needle is typically provided with a recess on its outer side into which an engagement projection on the inner side of the receiving recess of the insertion end enters. Alternatively, the hollow needle may have an engagement projection on its outer side for reception in a recess on the inner side of the receiving recess of the insertion end. In both cases, a form fit is produced, so that when the housing is rotated manually, the hollow needle is also rotated together.

The two coupling surfaces are provided with coupling release protrusions and coupling recesses that are complementary in their shape. In this case, the projections can all be arranged on one coupling surface, while the complementary coupling recesses can all be arranged on the other coupling surface. However, it is also possible to form protrusions and recesses on both coupling surfaces. According to the present invention, at least one coupling release protrusion and at least one coupling recess are required. Due to the elastic pretensioning of the two coupling surfaces, the two coupling surfaces bear against one another and the coupling release projection enters into its associated coupling recess until the torque exceeds a limit value. The magnitude of this value is subject to the construction and, for example, to the forces with which the two coupling surfaces bear against one another on the one hand and to the design (i.e. geometry) of the coupling-release projection and the coupling recess on the other hand. Typically, the coupling release protrusion and the coupling recess are configured as a sphere (e.g., a hemisphere or a half shell).

In order to ensure that the torque limitation is only effective when screwing the hollow needle into the phacoemulsification instrument handpiece (hereinafter referred to as phacoemulsification handpiece for the sake of representation of such an instrument), a non-return means is now provided in the device according to the invention. The non-return means have non-return projections and non-return recesses at the coupling surfaces, wherein it is also possible here for all non-return projections to be arranged on one coupling surface and all non-return recesses to be arranged on the other coupling surface, or for both coupling surfaces to have both non-return projections and non-return recesses. According to the present invention, at least one check protrusion and at least one check recess are required.

The relative arrangement of the non-return projections and the non-return recesses is selected according to the invention such that each non-return projection can be moved in its associated non-return recess in one direction of rotation of the housing about the axis of the rotary shaft, wherein this direction of rotation is the direction in which torque limitation is effective. Then, in this rotational direction, when the maximum permissible torque is reached, the coupling release projection is moved out of its coupling recess, whereby the two coupling surfaces are spaced apart by the height of the coupling release projection. In this state, the check projection is also removed from its check recess. According to the invention, the non-return projection is now flatter than the coupling-release projection, i.e. the height of the non-return projection is lower than the height of the coupling-release projection when viewed in the axial extension direction of the rotary shaft. Each non-return recess has two ends or end stops located in the direction of rotation of the housing and opposite to the direction of rotation of the housing. Before the non-return projection which has entered its associated non-return recess reaches the end in the direction of rotation in which the torque limitation is effective, it is already lifted out of the non-return recess when the torque limitation is exceeded, since the coupling release projection has already been moved out of the coupling recess. In contrast, when the coupling release protrusion is positioned in the coupling recess, each of the check projections in the check recess has abutted on the other end portion thereof. The non-return projection in the opposite rotational direction therefore does not allow the coupling release projection to move out of the coupling recess, whereby the torque limitation in this opposite rotational direction is cancelled and therefore deactivated.

The coupling release protrusion and the coupling recess may be arranged on a circular line running concentrically with the axis of the rotation shaft and aligned with each other (i.e., having the same radius). Also, the check protrusion and the check recess may be arranged on a circular line aligned with each other. Typically, however, the circular lines of the coupling release protrusion and the coupling recess are different from the circular lines of the check protrusion and the check recess, but this is not necessarily so.

In a further advantageous embodiment of the invention, it can be provided that the one coupling surface has a plurality of coupling release projections and the other coupling surface has the same number of coupling recesses as the number of coupling release projections or a number of coupling recesses 2 or 3 or more times the number of coupling release projections, wherein the relative arrangement of the coupling recesses equal to the number of coupling release projections is the same as the relative arrangement of the coupling release projections.

In a further advantageous embodiment of the invention, it can be provided that the one coupling surface has a greater number of non-return recesses than the non-return projections arranged on the other coupling surface.

It is also convenient that the number of non-return recesses is equal to the number of non-return projections or 2 or 3 or more times the number of non-return projections.

It is also advantageous if the one coupling surface has three coupling release projections, which are offset by 120 ° in each case, and the other coupling surface has six coupling recesses, which are offset by 60 ° in each case, and the one coupling surface has three non-return projections, which are offset by 120 ° in each case, and the other coupling surface has six non-return recesses, which are offset by 60 ° in each case, wherein each non-return recess is arranged in line with the center between two coupling recesses.

In a further advantageous embodiment of the invention, it can be provided that the or each coupling-release projection and the or each coupling-release recess are arranged on a first circular line which is concentric with the rotational axis, and the or each non-return projection and the or each non-return recess are arranged on a second circular line which is concentric with the rotational axis and which is different from the first circular line. However, the coupling-release recesses and the coupling-release protrusions may also be distributed along a plurality of first circular lines and correspondingly the non-return protrusions and the non-return recesses are also distributed along a plurality of second circular lines.

In a further advantageous embodiment of the invention, it is provided that the rotary shaft in the housing is rotatably mounted by means of a bearing bush, and/or that the rotary shaft extends through the drive part, and/or that a helical compression spring is arranged concentrically on the rotary shaft, which helical compression spring extends and is supported between a support surface in the housing and a support surface on the rotary shaft, and/or that the drive part is pressed against the rotary shaft by means of the helical compression spring.

Finally, it is also conceivable that the at least one or each engagement projection and/or the at least one or each coupling-release projection is configured spherically, and/or that the at least one or each non-return projection and the at least one or each non-return recess have contact faces at right angles or substantially at right angles to the coupling faces, which contact faces bear against one another when the at least one coupling-release projection enters the at least one coupling recess.

The device according to the invention is expediently made entirely or predominantly of plastic material (for example in the form of a plastic injection-molded part), which is particularly suitable for coupling. The more non-return projections are provided, the more anti-slip the coupling surfaces abut against each other when unscrewing the hollow needle.

Drawings

Hereinafter, the present invention is explained in more detail based on embodiments and with reference to the drawings. In particular, herein

Figure 1 shows a perspective view of an embodiment of an apparatus for mounting and dismounting a hollow needle on and from a phacoemulsification handpiece,

fig. 2 shows the device of fig. 1 in a side view, showing the device moved onto a hollow needle for mounting on a phacoemulsification handpiece,

figure 3 shows a perspective exploded view of the device structure of figure 1,

figure 4 shows a perspective view of the coupling face of the torque limiting and no-return coupling of the device of figure 1,

figures 5 and 6 show side and cross-sectional views of the coupler at two different twist positions of the two coupling parts,

FIG. 7 shows a side view of the coupler when its coupling partners are engaged, an

Fig. 8 and 9 show sectional views VIII-IX corresponding to fig. 7.

Detailed Description

Various views of an embodiment of an apparatus 10 for mounting a hollow needle 12 on a phacoemulsification handpiece 14 and for detaching the hollow needle 12 from the phacoemulsification handpiece 14 are shown in fig. 1 through 3. The device 10 has a housing 16 gripped by the fingers of a hand, in which a rotary shaft 18 is rotatably supported, the rotary shaft 18 extending outwardly through an opening 20 of the housing 16. This end of the rotary shaft 18 is a plug end 22 which is hollow and has an internal engagement projection 24, which is shown in particular in fig. 1 and 2. Hollow needle 12 has a tapered section 26 with a threaded sleeve 28 attached to tapered section 26. Within the conical section 26, the hollow needle 12 has a recess 30 on its outside, into which the engagement projection 24 engages when the hollow needle 12 is fully seated in the housing 16.

The rotating shaft 18 forms together with the drive part 32 a torque-limiting and non-return coupling 34 (hereinafter referred to as coupling for simplicity) having a first coupling face 36 and a second coupling face 38. The first coupling surface 36 is designed as a radial contact surface 40 on the rotary shaft 18 in the present exemplary embodiment, while the second coupling surface 38 is designed as a radial contact surface 42 of the drive part 32. The two coupling surfaces 36, 38 are elastically tensioned against one another and are formed by means of a spring 44, which is embodied in this embodiment as a helical compression spring. The rotary shaft 18 is rotatably supported in the housing 16 by bearing sleeves 46, 48, 50. Here, the rotary shaft 18 passes through the drive member 32. A spring 44, which is arranged coaxially on the rotational shaft 18, is located on the side of the drive part 32 facing away from the first coupling surface 36. The closure cap 52 is located at the end of the housing 16 facing away from the opening 20 for the plug end 22 of the rotary shaft 18. The spring 44 is supported on the one hand on a support surface (not shown) in the housing 16 and on the other hand on a support surface 45 arranged on the drive part 32 and facing away from the second coupling surface 38 of the drive part 32.

The drive part 32 is arranged in the housing 16 in a form-fitting manner. To this end, the drive member 32 has two circumferential recesses 54 which engage with internal drive lugs (not shown) in the housing 16. Thus, when the housing 16 is rotated, the drive member 32 rotates together in the housing 16, wherein the drive member 32 can move axially on the rotary shaft 18 without the drive lugs of the housing 16 disengaging from the circumferential recesses 54.

The main component of the device 10 is a coupler 34, which is again shown in perspective view in fig. 4. The coupler 34 is ultimately formed by the rotating shaft 18 and the drive member 32. In this embodiment, the first coupling surface 36 has six coupling recesses 56 which selectively interact with three coupling protrusions 58 of the second coupling surface 38. In this embodiment, the first coupling surface 36 also has six non-return recesses 60, which interact with three non-return projections 62 of the second coupling surface 38.

The coupler 34 according to the present invention is used to provide torque limiting in one of two opposite rotational movements of the housing 16. This rotational movement is the rotational movement by which the housing must be rotated to screw on the hollow needle 12. An additional function of the coupling 34 is to eliminate torque limitations in the opposite rotational direction of the housing 16. In the following, such an unspecified torque limitation is also referred to as "no return", which means that the torque limitation is prevented, i.e. cancelled.

Fig. 5 shows a state in which three coupling release protrusions 58 enter three coupling recesses out of six coupling recesses 56. In this state, three check projections 62 also enter three of the six check recesses 60. The drive member 32 is arranged in the housing 16 in a rotationally fixed manner. If the housing 16 is now rotated such that the drive part 32 rotates together in the direction of the arrow 64 (see fig. 5), the drive part 32 drives the rotary shaft 18 as long as the torque given by the strength of the spring 44 and by the pressing of the two coupling surfaces and by the design of the coupling release projection 58 and the coupling recess 56 is not exceeded. Once the torque is exceeded, the coupling release projection 58 moves out of the coupling recess 56, whereby the drive member 32 moves axially within the housing 16 against the force of the spring 44, as shown in fig. 6. In order for it to function in this screwing-type rotational movement of housing 16, check projection 62 must also be able to move out of check recess 60. This is in turn achieved by the check recess 60 having a greater extension than the check projection 62 when viewed in the circumferential direction of the rotary shaft 18. This is shown for example in fig. 5. The check recess 60 is approximately twice as wide as the check projection 62 (viewed in the circumferential direction of the rotary shaft 18).

In the coupled engaged state (see, e.g., fig. 5), check projection 62 rests on one end of check recess 60 and is exposed to the other end of check recess 60. The exposed distance is now sufficient for the drive part 32 to continue to rotate relative to the rotational shaft 18 when the torque limit is reached, whereby the coupling-release projection 58 can move out of the coupling-release recess 56, with the result that the non-return projection 62 is now located above the first coupling surface 36, whereby the drive part 32 can continue to rotate until the coupling-release projection 58 again enters the coupling-release recess 56 which is closest in the rotational direction. Then, the check projection 62 also re-enters the closest check recess 60. This "coupled sliding" process then continues with further rotation of the housing 16, which signals to the user (also by corresponding acoustic means if necessary) that the maximum allowable torque for screwing the hollow needle 12 onto the phacoemulsification handpiece 14 has been reached.

In the opposite case, i.e. when the housing 16 is rotated to unscrew the hollow needle 12, the situation according to fig. 5 or 7 is again obtained as a starting situation. If the housing 16 is now rotated in such a way that the drive part 32 is rotated in the direction of the arrow 66, the non-return projections 62 prevent a relative rotation of the drive part 32 and the rotary shaft 18, since, viewed in the direction of rotation of the arrow 66, they bear directly against the edge of the non-return recess 60 located in the direction of rotation 66.

Fig. 8 and 9 again show the above-described functions. The starting point is fig. 8, which shows the coupler 34 in engagement. Three coupling release protrusions 58 are located in three of the six coupling recesses 56, and three check protrusions 62 enter three of the six check recesses 60, and at their boundaries as viewed in the clockwise direction, with reference to fig. 8. Now, as shown in fig. 9, if the housing 16 is rotated to screw on the hollow needle 12 (see arrow 64), the coupling release protrusion 58 moves out of the coupling recess 56 when the maximum torque is exceeded. Since the height of the check projection 62 is lower than the height of the coupling release projection 58 as viewed in the axial direction, the check projection 62 moves above the coupling surface 36 concerned, i.e. torque limitation is allowed. In the opposite rotational direction, i.e. opposite to arrow 64 of fig. 9, the non-return projection 62 prevents and thus cancels the torque limitation. The drive member 32 thus in any case drives the rotary shaft 18, which facilitates the unscrewing of the hollow needle 12 from the phacoemulsification handpiece 14.

List of reference numerals

10 device

12 hollow needle

14 ultrasonic emulsifying machine head

16 casing

18 rotating shaft of casing

20 opening of the housing

22 plug end of rotating shaft

24 engaging projection

26 tapered section of hollow needle

28 screw sleeve of hollow needle

30 grooves in section 26

32 casing driving part

34 torque limiting and no-return coupling

36 first coupling surface

38 second coupling surface

40 first contact surface

42 second contact surface

44 spring

45 bearing surface on drive member of spring

46 bearing sleeve

48 bearing sleeve

50 bearing sleeve

52 closure cap for a housing

54 circumferential recess on the drive member

56 coupling recess

58 coupling release protrusion

60 check recess

62 non-return projection

64 arrow (rotation direction)

66 arrow (rotation direction)