阅读说明：本技术 一种包含限位悬臂的穿刺管组件及其使用方法 (Puncture tube assembly comprising limiting cantilever and application method thereof ) 是由 曾国庆 于 2020-09-21 设计创作，主要内容包括：本发明公开了一种包含限位悬臂的穿刺管组件,包含密封组件和中空管组件；所述密封组件包含第一密封组件和第二密封组件；所述第二密封包含第二密封仓,所述第二密封仓包含仓体近端和仓体远端以及在其间延伸的壁部分,所述中空管组件的近端与所述仓体远端连接并形成密封；所述中空管组件包含外导管和内导管；所述外导管包含外导管近端和外导管远端及在其间延伸的外导管壁；所述外导管道还包括轴向滑轨,所述滑轨包含滑轨顶壁,所述滑轨顶壁包含第一限位悬臂和第二限位悬臂。(The invention discloses a puncture tube assembly comprising a limiting cantilever, which comprises a sealing assembly and a hollow tube assembly; the seal assembly comprises a first seal assembly and a second seal assembly; the second seal comprises a second sealed cartridge comprising a cartridge body proximal end and a cartridge body distal end and a wall portion extending therebetween, the proximal end of the hollow tube assembly being connected to and forming a seal with the cartridge body distal end; the hollow tube assembly comprises an outer conduit and an inner conduit; the outer catheter comprises an outer catheter proximal end and an outer catheter distal end and an outer catheter wall extending therebetween; the outer guide pipe way further comprises an axial slide rail, the slide rail comprises a slide rail top wall, and the slide rail top wall comprises a first limiting cantilever and a second limiting cantilever.)

1. A puncture tube assembly including a spacing cantilever, comprising a sealing assembly and a hollow tube assembly; the seal assembly comprises a first seal assembly and a second seal assembly; the second seal comprising a second capsule comprising a capsule proximal end and a capsule distal end and a wall portion extending therebetween, wherein:

1) the near end of the hollow pipe assembly is connected with the far end of the bin body to form sealing; the hollow tube assembly comprises an outer conduit and an inner conduit; the outer catheter comprises an outer catheter proximal end and an outer catheter distal end and an outer catheter wall extending therebetween; the outer guide pipe further comprises an axial slide rail, the slide rail comprises a slide rail top wall, and the slide rail top wall comprises a first limiting cantilever and a second limiting cantilever; the first limiting cantilever and the second limiting cantilever are alternately and approximately uniformly distributed on the top wall of the sliding rail along the axial direction of the outer guide pipe; a radial cutting groove penetrating through the top wall of the sliding rail is formed between the first limiting cantilever and the second limiting cantilever; the first limiting cantilever comprises a first cantilever root, a first cantilever end and a first cantilever body extending between the first cantilever root and the first cantilever end; the second limiting cantilever comprises a second cantilever root, a second cantilever end and a second cantilever body extending between the second cantilever root and the second cantilever end; the first limiting cantilever and the second limiting cantilever have certain elasticity; the first cantilever body and the second cantilever body are aligned on the inner side of the slide rail, and the end head of the first cantilever comprises a first outer bulge which exceeds the top wall of the slide rail; the end of the second cantilever comprises a second outer bulge beyond the top wall of the sliding rail;

2) the inner catheter comprises an inner catheter proximal end and an inner catheter distal end and an inner catheter wall extending therebetween, an outer surface of the inner catheter proximal end comprising a circumferential ledge; the inner catheter is mounted inside the outer catheter, the outer circumference of the inner catheter wall is matched with the size and shape of the second hollow channel, the circumferential lug is matched with the shape and size of the sliding rail, and the inner catheter can move axially relative to the outer catheter;

3) the tube tail sealing element is arranged at the far end of the outer tube and comprises a near-end elastic ring and a far-end elastic ring; the sealing element is arranged outside the cylindrical surface of the tail of the outer catheter, wherein the near-end elastic ring is matched with the outer surface of the tail of the outer catheter to form air seal, and the far-end elastic ring is matched with the outer surface of the wall of the inner catheter to form air seal;

2. the puncture tube assembly of claim 1, wherein: the first limiting cantilever and the second limiting cantilever comprise a natural state and an elastic deformation state; in a natural state, the first limiting cantilever and the second limiting cantilever are aligned on the inner side of the sliding rail, and the inner guide pipe can axially move relative to the outer guide pipe; and under the elastic deformation state, simultaneously applying pressure towards the inside of the slide rail to the first cantilever end and the adjacent second cantilever end, and simultaneously axially moving the inner guide pipe to enable the annular lug to align with the radial cutting groove, so that the first cantilever body and the second cantilever body rotate and bend towards the inside of the slide rail, and the annular lug is embedded between the deformed first cantilever body and the deformed second cantilever body.

3. The puncture tube assembly of claim 2, wherein: the hollow tube assembly further comprises a film, the film is adhered to the outer surface of the top wall of the sliding rail, the film and the outer guide tube form air tight seal, and gas in the outer guide tube is prevented from leaking to the outside through the radial cutting groove.

4. The spike assembly of claim 3, wherein: the lock assembly is arranged outside the outer catheter and the film; the lock assembly comprises a lock body, an adjusting knob and a pressure plate; the lock body comprises a cylinder part and a U-shaped wall part connected with the cylinder part, and an inner hole defined by the cylinder part is matched with the outer diameter of the fixed pipe; the U-shaped space defined by the U-shaped wall part is matched with the shape and the size of the slide rail; the U-shaped wall portion comprises a top wall and a threaded hole penetrating through the top wall; the adjusting knob is arranged in the threaded hole, the far end of the adjusting screw is fixedly connected with the pressure plate, and the pressure plate can radially move in the U-shaped space by rotating the adjusting screw.

5. The puncture tube assembly of claim 4, wherein the lock assembly comprises a locked state and an unlocked state; in a locked state, the pressure plate is pushed to move towards the axis of the outer guide pipe by rotating the adjusting screw, so that pressure towards the inside of the slide rail is applied to the first cantilever end and the adjacent second cantilever end, the first cantilever and the second cantilever body rotate and bend towards the inside of the slide rail, the annular lug is embedded between the first cantilever body and the second cantilever body, and the axial movement of the inner guide pipe relative to the outer guide pipe is limited; in an unlocking state, the pressure plate is pulled to move towards the direction far away from the axis of the outer guide pipe by rotating the adjusting screw, the extrusion force to the first limiting cantilever and the second limiting cantilever is not generated, and the first limiting cantilever and the second limiting cantilever are elastically reset; the inner catheter is axially movable relative to the outer catheter and the lock assembly is axially movable along the outer catheter.

6. A method of adjusting the length of a hollow tube assembly of the spike assembly of claim 5 comprising the steps of:

s1: the lock assembly is set to be in an unlocking state, so that the lock assembly does not generate extrusion force for the first and second limiting cantilevers;

s2: axially moving the inner guide pipe to generate axial relative displacement with the outer guide pipe, thereby adjusting the length of the hollow pipe assembly to a proper position;

s3: moving the inner catheter axially to align the circumferential lug with the radial cut-out slot, setting the lock assembly to a locked state, applying pressure to the first boom tip and its adjacent second boom tip towards the interior of the sled, causing the first boom body and the second boom body to rotate and bend towards the interior of the sled, thereby causing the circumferential lug to embed between the deformed first boom body and the second boom body, thereby limiting axial movement of the inner catheter relative to the outer catheter.

Technical Field

The invention relates to a minimally invasive surgical instrument, in particular to a puncture outfit structure.

Background

A puncture instrument is a surgical instrument used in minimally invasive surgery (especially hard-tube endoscopic surgery) for establishing an artificial passage into a body cavity. Typically consisting of a spike assembly and a spike. The general clinical use mode is as follows: a small opening is cut on the skin of a patient, the puncture needle penetrates through the puncture tube assembly, and then the puncture needle penetrates through the abdominal wall through the skin opening to enter a body cavity. Once inside the body cavity, the needle is removed, leaving the puncture tube assembly as a passage for instruments into and out of the body cavity.

In the hard tube laparoscopic surgery, a pneumoperitoneum machine is usually adopted to continuously perfuse gas (such as carbon dioxide gas) into the abdominal cavity of a patient and maintain a stable gas pressure (about 13-15 mmHg) so as to obtain a sufficient operation space. The puncture tube assembly typically consists of a hollow tube, a housing, a sealing membrane (also known as an instrument seal) and a zero seal (also known as a self-seal). The puncture tube assembly penetrates from the outside of the body cavity to the inside of the body cavity and is used as a passage for instruments to enter and exit the body cavity. The housing connects the hollow tube, zero seal and sealing membrane into a sealed system. The zero seal generally does not provide a seal for the inserted instrument, but automatically closes and forms a seal when the instrument is removed. The sealing membrane grips the instrument and forms a seal as the instrument is inserted.

When the puncture tube assembly is secured to the abdominal wall of a patient, the hollow tube thereof may be divided into an extracorporeal section (length H1), a body wall section (length H2) and an intracorporeal section (length H3). The length H2 of the body wall segment varies, and when applied to different patients, the abdominal wall thickness varies from patient to patient, e.g., the difference between obese patients and the smaller abdominal wall thickness is greater; the wall section H2 varies for different puncture positions and puncture angles even when used with the same patient. The length H1 of the extracorporeal section cannot be reserved too long or too short, which is inconvenient for inserting the instrument, and especially when the puncture tube component is used as a main operation hole and needs to be repeatedly switched, the puncture tube component is too short which is inconvenient for operating the instrument at different inclination angles. The length H3 of the in-vivo section is not changed greatly generally, and is reserved for 20-30 mm. The length of the hollow tube of the puncture tube assembly in the prior art is fixed, and the requirements of different scene in the field cannot be met.

Disclosure of Invention

In one aspect of the invention, the puncture outfit of the hollow tube component comprising the annular limiting cantilever comprises a hollow tube component and a sealing component, wherein the proximal end of the hollow tube component is connected with the distal end of the sealing component to form an air seal; the puncture outfit also comprises a puncture needle penetrating through the puncture tube assembly; the hollow tube assembly includes an outer conduit and an inner conduit; the outer catheter comprises an outer catheter proximal end and an outer catheter distal end and an outer catheter wall extending therebetween, the outer catheter wall defining a first hollow channel; the outer catheter comprises a U-shaped cutting groove penetrating through the wall of the outer catheter, and the U-shaped cutting groove defines an annular limiting cantilever; the outer surface of the outer catheter wall comprises a plurality of U-shaped cutting grooves which are distributed on the outer surface of the outer catheter wall along the axial direction of the outer catheter wall, and each U-shaped cutting groove defines a circumferential limiting cantilever. The inner catheter comprises an inner catheter proximal end, an inner catheter distal end and an inner catheter wall extending therebetween, the outer surface of the inner catheter wall comprises a plurality of outer convex rings which are uniformly distributed on the outer surface of the inner catheter wall along the axial direction of the inner catheter wall, and two adjacent outer convex rings define an outer concave ring. The inner conduit is mounted within the outer conduit with the inner conduit wall having a peripheral size and shape matching the first hollow passage, the inner conduit being axially movable relative to the outer conduit.

In one aspect, the circumferentially-limited cantilever comprises a cantilever root and a cantilever tip and a cantilever body extending therebetween, the circumferentially-limited cantilever extending circumferentially along the outer catheter, an inner side of the circumferentially-limited cantilever being flush with an inner surface of the outer catheter wall, the cantilever tip comprising an outer protrusion extending outwardly beyond a cylinder defined by an outer surface of the outer catheter wall.

In still another scheme, the annular limiting cantilever has a width dimension P1 along the axial direction, and the outer concave ring has a width dimension X1 along the axial direction, wherein P1 ≦ X1.

In yet another aspect: the annular limiting cantilever has certain elasticity and comprises a natural state and an elastic deformation state; in a natural state, the inner side of the annular limiting cantilever is flush with the inner surface of the wall of the outer guide pipe, and the inner guide pipe can axially move relative to the outer guide pipe; under the elastic deformation state, pressure towards the axis of the outer guide pipe is applied to the end head of the cantilever, the inner guide pipe is axially moved at the same time, the annular limiting cantilever is aligned to the outer concave ring, the annular limiting cantilever can rotate towards the inside of the outer guide pipe and is bent and deformed, and therefore the end head of the cantilever is embedded into the outer concave ring, and axial movement of the inner guide pipe relative to the outer guide pipe is limited.

In yet another aspect, a thin film tube is included, the thin film tube comprising a thin film tube proximal end and a thin film tube distal end and a thin film tube wall extending therebetween, the thin film tube distal end comprising a thin film tube sealing aperture; the thin film tube wall is wrapped outside the outer guide tube and forms air seal with the outer guide tube, and the thin film tube sealing hole forms air seal with the outer surface of the inner guide tube.

In yet another aspect, a lock assembly is provided outside the outer catheter and the thin film tube, the lock assembly including an unlocked state and a locked state; in a locking state, the lock assembly applies extrusion force towards the axis of the outer guide pipe to the annular limiting cantilever to force the annular limiting cantilever to rotate and bend towards the inside of the outer guide pipe, so that the end head of the cantilever is embedded into the outer concave ring, and the axial movement of the inner guide pipe relative to the outer guide pipe is limited; under the unlocking state, the lock assembly wraps the outer surface of the outer catheter, extrusion force to the annular limiting cantilever is not generated, the inner catheter can move axially relative to the outer catheter, and the lock assembly can move axially along the outer catheter.

In another scheme, the lock assembly comprises a lock body, a lever handle and a limiting block, wherein the lever handle and the limiting block extend from two ends of the lock body; the locking piece body is formed into a locking piece hole through prefabricated curling, and the locking piece forms inward curled locking force.

In yet another aspect, the size of the locking element aperture is smaller than the outer diameter of the outer catheter, and the lock assembly includes a natural state, a locked state and an unlocked state; in a natural state, the handles and the limiting blocks at the two ends of the locking piece body are limited in a staggered mode by the inward curling force of the locking piece body; in a locked state, the lock assembly is wrapped outside the outer guide pipe and the thin film pipe, the inward curling force of the lock body applies extrusion force towards the axis of the outer guide pipe to the annular limiting cantilever to force the annular limiting cantilever to rotate and bend towards the inside of the outer guide pipe, and then the end head of the cantilever is embedded into the outer concave ring, so that the axial movement of the inner guide pipe relative to the outer guide pipe is limited; in an unlocking state, the two lever handles are pressed, the locking piece hole can be enlarged, extrusion force to the annular limiting cantilever is not generated, the inner catheter can axially move relative to the outer catheter, and meanwhile, the lock assembly can axially move along the outer catheter; when the two lever handles are released, the lock body is restored to form a locking state, and then inward curling force of the lock body applies extrusion force towards the axis of the outer guide pipe to the annular limiting cantilever to force the annular limiting cantilever to rotate and bend towards the inside of the outer guide pipe, so that the end head of the cantilever is embedded into the outer concave ring.

In another aspect, a puncture tube assembly, comprising: comprising the hollow tube assembly of any of claims 1-8, further comprising a sealing assembly, the proximal end of the hollow tube assembly being coupled to and forming a hermetic seal with the distal end of the sealing assembly.

In one aspect of the present invention, a hollow tube assembly for a puncture instrument is provided, comprising an outer catheter and an inner catheter. The outer catheter comprises an outer catheter proximal end and an outer catheter distal end and an outer catheter wall extending therebetween, the outer catheter wall defining a first hollow channel; the outer conduit further comprises an axial slide rail, the slide rail comprising a first slide rail side wall, a slide rail channel defined by a second slide rail side wall and a slide rail top wall and communicating with the first hollow channel. The inner catheter comprises an inner catheter proximal end and an inner catheter distal end and an inner catheter wall extending therebetween, an outer surface of the inner catheter proximal end comprising a circumferential lug. The inner conduit is mounted inside the outer conduit, the inner conduit wall having an outer circumference sized and shaped to mate with the second hollow channel, the circumferential ledge having an outer shape and size to mate with the slide rail, the inner conduit being axially movable relative to the outer conduit.

In one scheme, the top wall of the sliding rail comprises a first limiting cantilever and a second limiting cantilever; the first limiting cantilever and the second limiting cantilever are alternately and approximately uniformly distributed on the top wall of the sliding rail along the axial direction of the outer guide pipe; and a radial cutting groove penetrating through the top wall of the sliding rail is arranged between the first limiting cantilever and the second limiting cantilever.

In another aspect, the first constraining boom comprises a first boom root and a first boom tip and a first boom body extending therebetween; the second limiting cantilever comprises a second cantilever root, a second cantilever end and a second cantilever body extending between the second cantilever root and the second cantilever end; the first limiting cantilever and the second limiting cantilever have certain elasticity.

In another scheme, the root of the first cantilever is connected with the top wall of the slide rail close to the side wall of the first slide rail into a whole, and the root of the second cantilever is connected with the top wall of the slide rail close to the side wall of the second slide rail into a whole; the first cantilever body and the second cantilever body are aligned on the inner side of the slide rail, and the end head of the first cantilever comprises a first outer bulge which exceeds the top wall of the slide rail; the second cantilevered end includes a second outer projection beyond the top wall of the slide rail.

In another scheme, the first limiting cantilever and the second limiting cantilever comprise a natural state and an elastic deformation state; in a natural state, the first limiting cantilever and the second limiting cantilever are aligned on the inner side of the sliding rail, and the inner guide pipe can axially move relative to the outer guide pipe; and under the elastic deformation state, simultaneously applying pressure towards the inside of the slide rail to the first cantilever end and the adjacent second cantilever end, and simultaneously axially moving the inner guide pipe to enable the annular lug to align with the radial cutting groove, so that the first cantilever body and the second cantilever body can rotate and bend towards the inside of the slide rail, the annular lug is embedded between the deformed first cantilever body and the deformed second cantilever body, and the axial movement of the inner guide pipe relative to the outer guide pipe is limited.

In yet another aspect, the hollow tube assembly further includes a film adhered to the outer surface of the top wall of the slide rail, and the film forms a hermetic seal with the outer tube to prevent gas in the outer tube from leaking to the outside through the radial cut-off groove.

In another scheme, the medical patch further comprises a lock assembly arranged outside the outer catheter, wherein the lock assembly is wrapped outside the outer catheter and the patch; the lock assembly includes an unlocked state and a locked state; in a locked state, the lock assembly simultaneously applies pressure towards the interior of the slide rail to the first cantilever end and the adjacent second cantilever end, so that the first cantilever body and the second cantilever body rotate and bend towards the interior of the slide rail, and the annular lug is embedded between the deformed first cantilever body and the deformed second cantilever body; under the unlocking state, the lock assembly is wrapped outside the outer catheter and the film, the extrusion force for the first limiting cantilever and the second limiting cantilever is not generated, the first limiting cantilever and the second limiting cantilever elastically reset, and the inner catheter can axially move relative to the outer catheter.

In another embodiment, the tube comprises a tube tail sealing element arranged at the distal end of the outer tube, wherein the tube tail sealing element comprises a proximal elastic ring and a distal elastic ring; the sealing element is arranged outside the cylindrical surface of the tail of the outer catheter, wherein the near-end elastic ring is matched with the outer surface of the tail of the outer catheter to form air seal, and the far-end elastic ring is matched with the outer surface of the wall of the inner catheter to form air seal.

In yet another aspect, a puncture tube assembly comprises a hollow tube assembly as described in any of the preceding claims, further comprising a sealing assembly, wherein the proximal end of the hollow tube assembly is connected to the distal end of the sealing assembly and forms a gas tight seal.

In another aspect, a method for adjusting the length of a hollow tube assembly of a puncture tube assembly comprises the steps of:

s1: the lock assembly is set to be in an unlocking state, so that the lock assembly does not generate extrusion force for the first and second limiting cantilevers; s2: axially moving the inner guide pipe to generate axial relative displacement with the outer guide pipe, thereby adjusting the length of the hollow pipe assembly to a proper position;

s3: moving the inner catheter axially to align the circumferential lug with the radial cut-out slot, setting the lock assembly to a locked state, applying pressure to the first boom tip and its adjacent second boom tip towards the interior of the sled, causing the first boom body and the second boom body to rotate and bend towards the interior of the sled, thereby causing the circumferential lug to embed between the deformed first boom body and the second boom body, thereby limiting axial movement of the inner catheter relative to the outer catheter.

In one aspect of the invention, a puncture tube assembly is provided, comprising a seal assembly and a hollow tube assembly; the seal assembly comprises a first seal assembly and a second seal assembly; the second seal comprises a second capsule comprising a proximal capsule end and a distal capsule end and a wall portion extending therebetween. The near end of the hollow pipe component is connected with the far end of the bin body to form sealing. The hollow tube assembly includes an outer conduit and an inner conduit. The outer catheter comprises an outer catheter proximal end and an outer catheter distal end and an outer catheter wall extending therebetween; the outer guide pipe further comprises an axial slide rail, the slide rail comprises a slide rail top wall, and the slide rail top wall comprises a first limiting cantilever and a second limiting cantilever; the first limiting cantilever and the second limiting cantilever are alternately and approximately uniformly distributed on the top wall of the sliding rail along the axial direction of the outer guide pipe; and a radial cutting groove penetrating through the top wall of the sliding rail is arranged between the first limiting cantilever and the second limiting cantilever. The inner catheter comprises an inner catheter proximal end and an inner catheter distal end and an inner catheter wall extending therebetween, an outer surface of the inner catheter proximal end comprising a circumferential ledge; the inner conduit is mounted inside the outer conduit, the inner conduit wall having an outer circumference sized and shaped to mate with the second hollow channel, the circumferential ledge having an outer shape and size to mate with the slide rail, the inner conduit being axially movable relative to the outer conduit.

In one aspect, the first stop boom comprises a first boom root and a first boom tip and a first boom body extending therebetween; the second limiting cantilever comprises a second cantilever root, a second cantilever end and a second cantilever body extending between the second cantilever root and the second cantilever end; the first limiting cantilever and the second limiting cantilever have certain elasticity; the first cantilever body and the second cantilever body are aligned on the inner side of the slide rail, and the end head of the first cantilever comprises a first outer bulge which exceeds the top wall of the slide rail; the second cantilevered end includes a second outer projection beyond the top wall of the slide rail.

In another embodiment, the first and second limiting cantilevers comprise a natural state and an elastic deformation state; in a natural state, the first limiting cantilever and the second limiting cantilever are aligned on the inner side of the sliding rail, and the inner guide pipe can axially move relative to the outer guide pipe; and under the elastic deformation state, simultaneously applying pressure towards the inside of the slide rail to the first cantilever end and the adjacent second cantilever end, and simultaneously axially moving the inner guide pipe to enable the annular lug to align with the radial cutting groove, so that the first cantilever body and the second cantilever body rotate and bend towards the inside of the slide rail, and the annular lug is embedded between the deformed first cantilever body and the deformed second cantilever body.

In yet another aspect, the hollow tube assembly further includes a film adhered to the outer surface of the top wall of the slide rail, and the film forms a hermetic seal with the outer tube to prevent gas in the outer tube from leaking to the outside through the radial cut-off groove.

In another scheme, the medical patch further comprises a lock assembly arranged outside the outer catheter and the patch; the lock assembly comprises a lock body, an adjusting knob and a pressure plate; the lock body comprises a cylinder part and a U-shaped wall part connected with the cylinder part, and an inner hole defined by the cylinder part is matched with the outer diameter of the fixed pipe; the U-shaped space defined by the U-shaped wall part is matched with the shape and the size of the slide rail; the U-shaped wall portion comprises a top wall and a threaded hole penetrating through the top wall; the adjusting knob is installed in the threaded hole, the far end of the adjusting screw is fixed with the pressure plate, and the pressure plate can move radially in the U-shaped space by rotating the adjusting screw.

In yet another aspect, the lock assembly includes a locked state and an unlocked state; in a locked state, the pressure plate is pushed to move towards the axis of the outer guide pipe by rotating the adjusting screw, so that pressure towards the inside of the slide rail is applied to the first cantilever end and the adjacent second cantilever end, the first cantilever and the second cantilever body rotate and bend towards the inside of the slide rail, the annular lug is embedded between the first cantilever body and the second cantilever body, and the axial movement of the inner guide pipe relative to the outer guide pipe is limited; in an unlocking state, the pressure plate is pulled to move towards the direction far away from the axis of the outer guide pipe by rotating the adjusting screw, the extrusion force to the first limiting cantilever and the second limiting cantilever is not generated, and the first limiting cantilever and the second limiting cantilever are elastically reset; the inner catheter is axially movable relative to the outer catheter and the lock assembly is axially movable along the outer catheter.

In another embodiment, the tube comprises a tube tail sealing element arranged at the distal end of the outer tube, wherein the tube tail sealing element comprises a proximal elastic ring and a distal elastic ring; the sealing element is arranged outside the cylindrical surface of the tail of the outer catheter, wherein the near-end elastic ring is matched with the outer surface of the tail of the outer catheter to form air seal, and the far-end elastic ring is matched with the outer surface of the wall of the inner catheter to form air seal.

In one aspect of the present invention, a spike assembly comprising an inner catheter and an outer catheter comprises a sealing assembly and a hollow tube assembly; the seal assembly comprises a first seal assembly and a second seal assembly; the second seal comprises a second capsule comprising a proximal capsule end and a distal capsule end and a wall portion extending therebetween. Comprises an outer catheter, an inner catheter and a thin film tube. The outer catheter comprises an outer catheter proximal end and an outer catheter distal end and an outer catheter wall extending therebetween, the outer catheter wall defining a first hollow channel; the inner catheter includes an inner catheter proximal end and an inner catheter distal end and an inner catheter wall extending therebetween. The inner conduit is mounted within the outer conduit with the inner conduit wall having a peripheral size and shape matching the first hollow passage, the inner conduit being axially movable relative to the outer conduit. The thin film tube comprising a thin film tube proximal end and a thin film tube distal end and a thin film tube wall extending therebetween, the thin film tube distal end comprising a thin film tube sealing aperture; the thin film tube wall is wrapped outside the outer guide tube and forms air seal with the outer guide tube, and the thin film tube sealing hole forms air seal with the outer surface of the inner guide tube. In one embodiment, the outer surface of the inner conduit wall comprises a plurality of outer convex rings uniformly distributed on the outer surface of the inner conduit wall along the axial direction thereof, and two adjacent outer convex rings define an outer concave ring;

in still another scheme, the height Hd1 of the convex ring is more than or equal to 0.3mm and less than or equal to Hd1 and less than or equal to 0.5 mm.

In yet another aspect, the outer catheter includes a U-shaped cut-out through the outer catheter wall, the U-shaped cut-out defining a circumferential stop cantilever; the outer surface of the outer catheter wall comprises a plurality of U-shaped cutting grooves, the plurality of U-shaped cutting grooves are distributed on the outer surface of the outer catheter wall along the axial direction of the outer catheter wall, and each U-shaped cutting groove defines a circumferential limiting cantilever; the circumferentially-limited cantilever comprises a cantilever root and a cantilever tip and a cantilever body extending therebetween, the circumferentially-limited cantilever extends in a circumferential direction of the outer catheter, an inner side of the circumferentially-limited cantilever is flush with an inner surface of the outer catheter wall, and the cantilever tip comprises an outer protrusion extending outwardly beyond a cylinder defined by an outer surface of the outer catheter wall.

In still another scheme, the annular limiting cantilever has a width dimension P1 along the axial direction, and the outer concave ring has a width dimension X1 along the axial direction, wherein P1 ≦ X1.

In another scheme, the annular limiting cantilever has certain elasticity, and the annular limiting cantilever comprises a natural state and an elastic deformation state; in a natural state, the inner side of the annular limiting cantilever is flush with the inner surface of the wall of the outer guide pipe, and the inner guide pipe can axially move relative to the outer guide pipe; under the elastic deformation state, pressure towards the axis of the outer guide pipe is applied to the end head of the cantilever, the inner guide pipe is axially moved at the same time, the annular limiting cantilever is aligned to the outer concave ring, the annular limiting cantilever can rotate towards the inside of the outer guide pipe and is bent and deformed, and therefore the end head of the cantilever is embedded into the outer concave ring, and axial movement of the inner guide pipe relative to the outer guide pipe is limited.

In yet another aspect, the medical device further comprises a lock assembly disposed outside the outer catheter and the thin film tube, the lock assembly including an unlocked state and a locked state; in a locking state, the lock assembly applies extrusion force towards the axis of the outer guide pipe to the annular limiting cantilever to force the annular limiting cantilever to rotate and bend towards the inside of the outer guide pipe, so that the end head of the cantilever is embedded into the outer concave ring, and the axial movement of the inner guide pipe relative to the outer guide pipe is limited; under the unlocking state, the lock assembly wraps the outer surface of the outer catheter, extrusion force to the annular limiting cantilever is not generated, the inner catheter can move axially relative to the outer catheter, and the lock assembly can move axially along the outer catheter.

In another scheme, the lock assembly comprises a lock body, a lever handle and a limiting block, wherein the lever handle and the limiting block extend from two ends of the lock body; the locking piece body is formed into a locking piece hole through prefabricated curling, and the locking piece forms inward curled locking force.

In yet another aspect, the size of the locking element aperture is smaller than the outer diameter of the outer catheter, and the lock assembly includes a natural state, a locked state and an unlocked state; in a natural state, the handles and the limiting blocks at the two ends of the locking piece body are limited in a staggered mode by the inward curling force of the locking piece body; in a locked state, the lock assembly is wrapped outside the outer guide pipe and the thin film pipe, the inward curling force of the lock body applies extrusion force towards the axis of the outer guide pipe to the annular limiting cantilever to force the annular limiting cantilever to rotate and bend towards the inside of the outer guide pipe, and then the end head of the cantilever is embedded into the outer concave ring, so that the axial movement of the inner guide pipe relative to the outer guide pipe is limited; in an unlocking state, the two lever handles are pressed, the locking piece hole can be enlarged, extrusion force to the annular limiting cantilever is not generated, the inner catheter can axially move relative to the outer catheter, and meanwhile, the lock assembly can axially move along the outer catheter; when the two lever handles are released, the lock body is restored to form a locking state, and then inward curling force of the lock body applies extrusion force towards the axis of the outer guide pipe to the annular limiting cantilever to force the annular limiting cantilever to rotate and bend towards the inside of the outer guide pipe, so that the end head of the cantilever is embedded into the outer concave ring.

In another aspect, a method for adjusting the length of a hollow tube assembly of a puncture tube assembly comprises the steps of:

s1: applying external force to pinch two lever handles of the lock component and keeping pinching force, expanding the hole of the lock component and not generating extrusion force to the annular limiting cantilever;

s2: maintaining the pinching pressure while axially moving the inner conduit to cause axial relative displacement with respect to the outer conduit, thereby adjusting the length of the hollow tube assembly to a desired position;

s3: the locking assembly is released, and the locking assembly body is restored to form a locking state, so that the locking assembly applies extrusion force towards the axis of the outer guide pipe to the annular limiting cantilever to force the annular limiting cantilever to rotate and bend towards the inside of the outer guide pipe, and the end head of the cantilever is embedded into the outer concave ring, so that the inner guide pipe is limited from moving axially relative to the outer guide pipe.

In one aspect of the present invention, a puncture instrument is provided that includes a puncture tube assembly and a puncture needle extending through the puncture tube assembly.

Drawings

For a fuller understanding of the nature of the present invention, reference should be made to the following detailed description taken together with the accompanying figures in which:

FIG. 1 is an exploded view of a seal assembly 2;

FIG. 2 is a cross-sectional view of the seal assembly 2;

FIG. 3 is a cross-sectional view of the seal assembly 2 at 90 from FIG. 2;

fig. 4 is an exploded view of the hollow tube assembly 3;

FIG. 5 is a perspective view of an outer catheter 500;

FIG. 6 is a perspective view of an inner catheter 600;

FIG. 7 is a side view of the mating assembly of the outer catheter 500 and the inner catheter 600;

FIG. 8 is an enlarged view of 8-8 of FIG. 7;

FIG. 9 is an enlarged view of 9-9 of FIG. 8;

FIG. 10 is an enlarged view of the cross-sectional view 10-10 of FIG. 7;

FIG. 11 is a schematic view of the cross-sectional view of FIG. 10 after the retainer arms are elastically deformed;

FIG. 12 is a cross-sectional view of the thin film tube 50;

FIG. 13 is a perspective view of the spike assembly 1;

fig. 14 is a perspective view of the lock assembly 800;

fig. 15 is an exploded view of the hollow tube assembly 3 a;

FIG. 16 is a perspective view of an outer catheter 500 a;

FIG. 17 is a perspective view of the inner catheter 600 a;

FIG. 18 is a perspective view of the mating assembly of the outer catheter 500a and the inner catheter 600 a;

fig. 19 is a side view of the mating assembly of the outer catheter 500 and the inner catheter 600;

FIG. 20 is a cross-sectional view 20-20 of FIG. 19;

FIG. 21 is an enlarged view of 21-21 of FIG. 20;

fig. 22 is a side view of the lock assembly 900;

FIG. 23 is a perspective view of the puncture tube assembly 1 a;

the same reference numbers will be used throughout the drawings to refer to identical or similar parts or elements.

Detailed Description

Embodiments of the present invention are disclosed herein, however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms. Therefore, the disclosure herein is not to be interpreted as limiting, but merely as a basis for the claims and as a basis for teaching one skilled in the art how to employ the present invention. Embodiments of the present disclosure will now be described in detail with reference to the drawings, where for convenience, the party proximal to the operator is defined as the proximal end and the party distal from the operator is defined as the distal end.

Figures 1-13 depict a puncture tube assembly 1 for use in laparoscopic procedures. The spike assembly 1 comprises a sealing assembly 2 and a hollow tube assembly 3. Fig. 1-3 depict the structure and composition of the seal assembly 2. The seal assembly 2 may be divided into a first seal assembly 100 and a second seal assembly 200. The first seal assembly 100 is also referred to as an instrument seal assembly, and when an external instrument is inserted, the central bore of the first seal assembly grips the instrument to form an air tight seal. The second sealing assembly is also called a zero sealing assembly, when an external instrument is not inserted, the zero sealing assembly automatically closes to form sealing, when the external instrument is inserted, the zero sealing assembly opens, and no sealing is formed between the zero sealing assembly and the instrument. The locking groove 239 of the component 200 and the locking hook 112 of the component 100 are fastened in a matching manner. The hook 112 and the slot 239 can be quickly detached by one hand. The connection between the assembly 100 and the assembly 200 is implemented in a variety of ways. Besides the structure shown in the embodiment, the structure can also adopt a threaded connection, a rotary buckle or other quick locking structures. Alternatively, the assembly 100 and the assembly 200 may be designed in a configuration that is not quickly detachable.

Fig. 4-10 depict the structure and composition of hollow tube assembly 3, which hollow tube assembly 3 includes an outer catheter 500 and an inner catheter 600. Fig. 5 depicts the structure and composition of the outer catheter 500. The outer catheter 500 includes an outer catheter proximal end 510 and an outer catheter distal end 530 with an outer catheter wall 520 extending therebetween. The outer catheter wall 520 defines a first hollow channel 521. The outer catheter wall 520 comprises a U-shaped cut-out 540, the U-shaped cut-out 540 extending through the outer catheter wall 520 defining a circumferential stop cantilever 550. The circumferentially-oriented stop boom 550 includes a boom root 551 and a boom tip 559 and a boom body 555 extending therebetween. The circumferential stop cantilever 550 extends in the circumferential direction of the outer catheter, the inner side of the circumferential stop cantilever being flush with the inner surface of the outer catheter wall; the cantilever tip 559 includes an outer protrusion 558, the outer protrusion 558 extending outwardly beyond the cylinder defined by the outer surface of the outer catheter wall. In one implementation, the outer surface of the outer catheter wall 520 comprises a plurality of U-shaped cut-off grooves 540, the plurality of U-shaped cut-off grooves 540 are evenly distributed on the outer surface of the outer catheter wall along the axial direction thereof, and each U-shaped cut-off groove 540 defines a circumferential limit cantilever 550; two adjacent U-shaped cut-out slots 540 define a circumferential cross-piece 560.

As shown in fig. 6, the inner catheter 600 includes an inner catheter proximal end 610 and an inner catheter distal end 630 with an inner catheter wall 620 extending therebetween. The inner surface of the inner catheter wall defines a second hollow passageway 621 and the inner catheter distal end 630 defines an open tube lip 631. The outer surface of the inner catheter wall 620 comprises a plurality of outer convex rings 640, the plurality of outer convex rings 640 are uniformly distributed on the outer surface of the inner catheter wall along the axial direction of the inner catheter wall, and two adjacent outer convex rings 640 define an outer concave ring 650; the plurality of male rings 640 and female rings 650 form alternating male and female slip resistant zones 660, the slip resistant zones 660 extending from the outer surface of the proximal end 610 of the inner catheter to the distal end 630 of the inner catheter. In an alternative embodiment, the distance Dx between the anti-slip region 660 and the distal end 640 of the inner catheter is 20mm or more and 30mm or less. The circumferential limiting cantilever 550 has a width dimension P1 along the axial direction, and the outer concave ring 650 has a width dimension X1 along the axial direction, wherein P1 is not more than X1.

Fig. 7-8 depict the assembled relationship of the outer catheter 500 and the inner catheter 600. The inner conduit 600 is mounted inside the outer conduit 500 with the inner conduit wall 620 having a peripheral size and shape that matches the first hollow passage 521, the inner conduit being axially movable relative to the outer conduit. In one design, the outer catheter 500 is injection molded from a thermoplastic material, such as nylon, polycarbonate (polycarbonate plus fiberglass), etc., and the circumferential stop cantilever 550 has some flexibility. As shown in fig. 10-11, the circumferential restraining cantilever 550 comprises a natural state and an elastically deformed state. Naturally, as shown in fig. 10, the inner side of the circumferential restraining cantilever 550 is flush with the inner surface of the outer catheter wall, and the inner catheter is axially movable relative to the outer catheter. In the elastically deformed state, as shown in fig. 11, applying pressure to the cantilever tip 559 towards the axis of the outer catheter while axially moving the inner catheter aligns the circumferential stop cantilever 550 with the outer concave ring 650, causes the circumferential stop cantilever 550 to rotate and bend towards the inside of the outer catheter, thereby allowing the cantilever tip 559 to embed into the outer concave ring 650, thereby limiting the axial movement of the inner catheter relative to the outer catheter.

In one design, the height Hd1 of the outward protruding ring 640, wherein Hd1 is greater than or equal to 0.3mm and less than or equal to 0.5mm, when Hd1 is less than 0.3mm, the outward protruding ring is difficult to manufacture, the depth of engagement between the outward protruding ring and the elastically deformed ring-shaped limiting cantilever 550 is too shallow, and the frictional force of the outward protruding ring wrapped on the wound of the abdominal wall of the patient is insufficient; when Hd1 is larger than 0.5mm, the outer diameter of the inner catheter needs to be increased to ensure sufficient strength, so that the damage of the puncture wound is increased, and when the outer convex ring is wrapped on the abdominal wall wound of the patient, the outer convex ring exceeding 0.5mm is easy to cause additional damage to the wound.

The hollow tube assembly 3 further comprises a thin film tube 50. As shown in FIGS. 12-13, the thin film tube 50 comprises a thin film tube proximal end 51 and a thin film tube distal end 53 with a thin film tube wall 52 extending therebetween, the thin film tube wall 52 defining a third hollow passageway 55. The thin film tube distal end 53 contains a thin film tube sealing aperture 59. The membrane tube 50 is mounted outside the outer catheter 500 with the membrane tube wall 52 wrapped around and hermetically sealed to the outside of the outer catheter wall 520, preventing gas in the outer catheter from leaking out of the outer catheter through the U-cut groove 540. In one embodiment, the thin film tube proximal end 51 is bonded to the outer surface of the outer catheter proximal end 510; the thin film tube distal end 53 is bonded to the outer surface of the outer catheter distal end 530. In one alternative, the thin film tube 50 is made of a thermoset elastomeric material (e.g., silicone rubber) or a thermoplastic elastomeric material (e.g., polyurethane), which is flexible and resilient.

The hollow tube assembly 3 further includes a lock assembly disposed outside the outer catheter for applying pressure to the circumferential limiting cantilever towards the axis of the outer catheter, so that the circumferential limiting cantilever is elastically deformed, thereby allowing the circumferential limiting cantilever 550 to rotate and bend towards the inside of the outer catheter, and further allowing the cantilever tip 559 to be embedded in the outer concave ring 650, thereby limiting the axial movement of the inner catheter relative to the outer catheter. The lock assembly includes an unlocked state and a locked state. In a locked state, the lock assembly applies extrusion force towards the axis of the outer catheter to the annular limiting cantilever to force the annular limiting cantilever 550 to rotate and bend towards the inside of the outer catheter, so that the end 559 of the cantilever is embedded into the outer concave ring 650, and the axial movement of the inner catheter relative to the outer catheter is limited; under the unlocking state, the lock assembly wraps the outer surface of the outer catheter and does not generate extrusion force to the annular limiting cantilever, and under the unlocking state, the inner catheter can axially move relative to the outer catheter, and the lock assembly can axially move along the outer catheter.

13-14 depict an automatically retracting lock assembly 800, the lock assembly 800 including a lock body and a lever handle and stop block extending from either end of the lock body; the locking piece body is formed into a locking piece hole through prefabricated curling, and the locking piece forms inward curled locking force. The locking assembly 800 includes a locking assembly body 810, and a lever handle 820 and a stopper 830 extending from both ends of the locking assembly body 810. The lock body 810 is formed with a lock hole 840 by pre-crimping, and the lock 800 forms a locking force of being inwardly crimped. The inward curling force of the lock body 810 alternately defines the handles 820 and the stopping edges 830 at both ends of the lock body 810, and the handles 820 are alternately formed into an approximately V-shape. The lock aperture 840 may be enlarged or reduced by squeezing or releasing the two handles 820.

As shown in FIG. 10, the lock assembly 800 is mounted to the exterior of the outer catheter tube 500 and thin film tube 50 with the lock apertures 840 wrapped around the exterior of the outer catheter tube 500 and thin film tube 50. The size of the locking element bore 840 is smaller than the outer diameter of the outer catheter and the lock assembly 800 includes a natural state, a locked state and an unlocked state. In a natural state, the inward curling force of the locking member 810 alternately limits the handles and the limiting blocks at the two ends of the locking member; in the locked state, the lock assembly 800 is wrapped around the outer catheter 500 and the thin film tube 50, and the inward curling force of the lock body 810 applies a pressing force to the annular limiting cantilever towards the axis of the outer catheter to force the annular limiting cantilever 550 to rotate and bend towards the inside of the outer catheter, so that the cantilever tip 559 is embedded into the outer concave ring 650, and the axial movement of the inner catheter relative to the outer catheter is limited; in the unlocking state, the two lever handles are pressed, the locking piece hole can be enlarged, extrusion force to the annular limiting cantilever is not generated, the inner catheter can axially move relative to the outer catheter in the unlocking state, and meanwhile, the lock assembly can axially move along the outer catheter; when the two lever handles are released and the lock body is restored to the locked state, the inward curling force of the lock body applies a pressing force to the circumferential stop cantilever toward the axis of the outer catheter, forcing the circumferential stop cantilever 550 to rotate and bend toward the inside of the outer catheter, so that the cantilever tip 559 is embedded in the outer concave ring 650, thereby limiting the axial movement of the inner catheter relative to the outer catheter.

As shown in fig. 13, the puncture tube assembly 1 comprises a sealing assembly 2 and a hollow tube assembly 3, and the proximal end of the hollow tube assembly 3 is connected to the distal end of the sealing assembly 2 and forms an airtight seal. The second seal assembly 200 comprises a second seal cartridge 230, wherein the second seal cartridge 230 has a cartridge body distal end 234 that is shaped and dimensioned to mate with the outer catheter proximal end 510, and the cartridge body distal end 234 is connected to and forms an air seal with the outer catheter proximal end 510. In one scheme, the distal end 234 of the bin body is firmly connected with the proximal end 510 of the outer catheter by a glue bonding method to form an airtight seal; another method employs an interference fit to securely couple and form an air tight seal between the distal end 234 of the cartridge body and the proximal end 510 of the outer catheter. The method of connecting the sealing member 2 and the hollow tube member 3 includes various ways in addition to the above-listed methods. For example, a sealing ring is added to the outside of the tip of the outer catheter 500, and the outer catheter tip and the distal end of the cartridge body are securely connected and hermetically sealed by a conventional snap-fit connection or a threaded connection.

It will be appreciated by those skilled in the art that when the puncture tube assembly 1 is used in laparoscopic surgery, the surgeon can vary the overall length of the hollow tube assembly of the puncture tube assembly and adjust the fixed depth of the puncture tube assembly in the abdominal wall according to the thickness of the abdominal wall of the patient, the position and puncture angle of the puncture tube assembly, and the personal operation habit, etc., so that the desired arrangement of the external section (length H1), the internal section (length H2) and the internal section (length H3) of the puncture tube assembly is achieved. The method of adjusting the length of the hollow tube of the puncture tube assembly 1 comprises the steps of:

s1: applying external force to pinch two lever handles of the lock component and keeping pinching force, expanding the hole of the lock component and not generating extrusion force to the annular limiting cantilever;

s2: maintaining the pinching pressure while axially moving the inner conduit to cause axial relative displacement with respect to the outer conduit, thereby adjusting the length of the hollow tube assembly to a desired position;

s3: the locking assembly is released, and the locking assembly body is restored to form a locking state, so that the locking assembly applies extrusion force towards the axis of the outer guide pipe to the annular limiting cantilever to force the annular limiting cantilever to rotate and bend towards the inside of the outer guide pipe, and the end head of the cantilever is embedded into the outer concave ring, so that the inner guide pipe is limited from moving axially relative to the outer guide pipe.

Figures 15-21 depict yet another hollow tube assembly 3 a. The hollow tube assembly 3a includes an outer tube 500a, an inner tube 600a and a film 50 a. Fig. 16 depicts the structure and composition of the outer catheter 500 a. The outer conduit 500a includes an outer conduit proximal end 510a and an outer conduit distal end 530a with an outer conduit wall 520a extending therebetween. The outer conduit wall 520a defines a first hollow channel 521 a. The outer catheter distal end 530a includes an outer catheter tail cylinder 540 a. The outer conduit 500a further includes an axial slide 550a disposed along an axial direction thereof, the slide 550a including a first slide side wall 551a and a second slide side wall 552a integrally connected to the outer conduit wall 520a, and a slide top wall 553a connected to the slide side walls 551a, 552 a. The slide side walls 551a, 552a and the slide top wall 553a define a slide channel 555a that communicates with the first hollow channel 521 a. In this example, the cross section of the slide rail 550a is approximately U-shaped, but may be V-shaped, T-shaped, polygonal, or other non-wall-sealing patterns including openings. The sled 550a defines a sled inlet 557a at the proximal end 510a of the outer catheter, and the sled 550a extends axially into the vicinity of the distal end 530a of the outer catheter to define a wall-sealing sled end 559 a.

The sled top wall 553a also includes a first stop cantilever 560a and a second stop cantilever 570 a. The first stop boom 560a includes a first boom root 561a and a first boom tip 569a with a first boom body 563a extending therebetween. The second retaining bracket 570a includes a second bracket root 571a, a second bracket tip 579a, and a second bracket body 573a extending therebetween. A plurality of said first stop cantilevers 560a and second stop cantilevers 570a are alternately distributed substantially uniformly in the axial direction of the outer guide tube at the sled top wall 553a, and the first stop cantilevers and the second stop cantilevers contain therebetween a radial cut-off groove 590a penetrating the sled top wall 553 a. In one implementation, the first cantilever root portion 561a is integrally connected to the top wall of the slide rail adjacent to the first slide rail side wall, and the second cantilever root portion 571a is integrally connected to the top wall of the slide rail adjacent to the second slide rail side wall. In one implementation, the first boom body 563a and the second boom body 573a are aligned inside the sled, the first boom tip 569a comprising a first outer protrusion 568a beyond the top wall of the sled; the second cantilevered end 579a includes a second outer protrusion 578a that extends beyond the top wall of the slide rail.

As shown in fig. 17, the inner catheter 600a includes an inner catheter proximal end 610a and an inner catheter distal end 630a with an inner catheter wall 620a extending therebetween. The inner surface of the inner conduit wall 620a defines a second hollow passage 621 a. The outer surface of the inner catheter proximal end 610a includes a circumferential ledge 650 a.

Fig. 18-21 depict the assembled relationship of the outer and inner conduits. An inner catheter 600a is mounted inside the outer catheter 500a, the inner catheter wall having an outer circumference sized and shaped to mate with the first hollow channel, the circumferential ledge shaped and sized to mate with the sled, the inner catheter being axially movable relative to the outer catheter. In one embodiment, the outer catheter 500a is injection molded from a thermoplastic material, such as nylon, polycarbonate (polycarbonate plus fiberglass), etc., and the first and second retaining arms 560a and 570a have a certain elasticity. The first and second retaining arms 560a, 570a comprise a natural state and an elastically deformed state. Naturally, the first and second retaining arms 560a, 570a are aligned inside the slide rail and the inner conduit is axially movable relative to the outer conduit. In the elastically deformed state, by simultaneously applying a pressure to the first boom tip 569a and its adjacent second boom tip 579a toward the interior of the slide rail and simultaneously axially moving the inner catheter so that the circumferential lug 650a is aligned with the radial cut-out slot 590a, the first boom body 563a and the second boom body 573a are rotated and flexurally deformed toward the interior of the slide rail, so that the circumferential lug 650a is inserted between the deformed first boom body 563a and the second boom body 573a, thereby restricting the axial movement of the inner catheter relative to the outer catheter.

Referring to fig. 15 and 23, the film 50a includes a film body 53a defined by a film edge 51 a. The adhesive film 50a is adhered to the outer surface of the rail top wall 553a, and the adhesive film 50a forms a hermetic seal with the outer duct 500a to prevent gas in the outer duct from leaking to the outside through the radial direction cutoff groove 590 a.

The hollow tube assembly 3a further comprises a lock assembly arranged outside the outer catheter, the lock assembly is wrapped outside the outer catheter and the film and used for applying pressure towards the inside of the sliding rail to the first limiting cantilever and the second limiting cantilever to enable the first limiting cantilever and the second limiting cantilever to rotate and bend towards the inside of the sliding rail, and then the annular lug is embedded between the first cantilever body and the second cantilever body which deform, so that the inner catheter is limited to move axially relative to the outer catheter. The lock assembly includes an unlocked state and a locked state. In the locked state, pressure is simultaneously applied to the first boom tip 569a and its adjacent second boom tip 579a towards the interior of the slide rail, causing the first boom body 563a and the second boom body 573a to rotate and bendingly deform towards the interior of the slide rail, such that the annular ledge 650a is embedded between the deformed first boom body 563a and the second boom body 573a, thereby limiting axial movement of the inner catheter relative to the outer catheter. Under the unlocking state, the lock assembly is wrapped outside the outer catheter and the film, the extrusion force for the first limiting cantilever and the second limiting cantilever is not generated, the inner catheter can axially move relative to the outer catheter under the unlocking state, and the lock assembly can axially move along the outer catheter.

Fig. 22-23 depict a lock assembly 900. The lock assembly 900 includes a lock body 910, an adjustment knob 980 and a pressure plate 990. The locking body 910 comprises a cylindrical body portion 911 and a U-shaped wall portion 913 connected thereto, the cylindrical body portion 911 defining an inner bore 912 matching the outer diameter of the stationary tube 500 a; the U-shaped space 914 defined by the U-shaped wall portion 913 matches the shape and size of the slide rail 550 a. The U-shaped wall section 913 includes a top wall 915 and a threaded hole 916 extending through the top wall. An adjustment knob 980 includes external threads that mate with threaded holes 916 in which adjustment knob 980 is mounted, and a distal end 989 of an adjustment screw is riveted to clamp plate 990, and rotation of the adjustment screw causes clamp plate 990 to move radially in the U-shaped space.

As shown in fig. 23, the lock assembly 900 is mounted to the exterior of the outer catheter 500a and the patch 50 a. The lock assembly 900 includes a locked state and an unlocked state. Locking state: rotating the adjustment screw 980 urges the pressure plate 990 towards the axial center of the outer catheter, thereby applying a pressure on the first boom tip 569a and its adjacent second boom tip 579a towards the interior of the slide, causing the first boom body 563a and the second boom body 573a to rotate and bend towards the interior of the slide, thereby causing the annular ledge 650a to embed between the deformed first boom body 563a and the second boom body 573a, thereby limiting axial movement of the inner catheter relative to the outer catheter. In an unlocked state, the rotating adjusting screw 980 pulls the pressing plate 990 to move towards a direction far away from the axis of the outer catheter, so that the extrusion force for the first and second limiting cantilevers is not generated, and the first and second limiting cantilevers 560a and 570a elastically reset; the inner catheter is axially movable relative to the outer catheter and the lock assembly is axially movable along the outer catheter.

As shown in fig. 23, the hollow tube assembly 3a further comprises a tube end seal 800 mounted on the distal end of the outer tube, the tube end seal 800 comprising a proximal elastic ring 810 and a distal elastic ring 830. The seal 800 is mounted on the exterior of the outer catheter tail cylinder 540a with the proximal elastomeric ring 810 mating with the outer catheter tail cylinder 540a to form an airtight seal and the distal elastomeric ring 830 mating with the outer surface of the inner catheter wall 620a to form an airtight seal.

As shown in fig. 23, the puncture tube assembly 1a comprises a sealing assembly 2 and a hollow tube assembly 3a, and the proximal end of the hollow tube assembly 3a is connected to the distal end of the sealing assembly 2 and forms an airtight seal. The second seal assembly 200 comprises a second seal cartridge 230, the cartridge body distal end 234 of the second seal cartridge 230 comprising an extension tube portion 2341 shaped and dimensioned to mate with the outer catheter proximal end 510a, the extension tube portion 2341 being coupled to and forming a gas-tight seal with the outer catheter proximal end 510 a. In an alternative arrangement, the outer catheter proximal end 510a and the extension tube portion 2341 are joined together by glue bonding.

It will be appreciated by those skilled in the art that when the puncture tube assembly 1a is used in laparoscopic surgery, the surgeon can change the overall length of the hollow tube assembly of the puncture tube assembly according to the thickness of the abdominal wall of the patient, the position and puncture angle of the puncture tube assembly, and the personal operation habit, etc., and further adjust the fixed depth of the puncture tube assembly in the abdominal wall, so that the desired arrangement of the external section (length H1), the internal section (length H2) and the internal section (length H3) of the puncture tube assembly is achieved. The method of adjusting the length of the hollow tube assembly of the puncture tube assembly 1a comprises the steps of:

s1: the lock assembly is set to be in an unlocking state, so that the lock assembly does not generate extrusion force for the first and second limiting cantilevers; s2: axially moving the inner guide pipe to generate axial relative displacement with the outer guide pipe, thereby adjusting the length of the hollow pipe assembly to a proper position;

s3: moving the inner catheter axially to align the circumferential lug with the radial cut-out slot, setting the lock assembly to a locked state, applying pressure to the first boom tip and its adjacent second boom tip towards the interior of the sled, causing the first boom body and the second boom body to rotate and bend towards the interior of the sled, thereby causing the circumferential lug to embed between the deformed first boom body and the second boom body, thereby limiting axial movement of the inner catheter relative to the outer catheter.

Those skilled in the art will readily appreciate that the spike assembly also requires a mating spike. The puncture needle penetrates through the puncture tube assembly to form a puncture outfit, then the puncture outfit and the puncture outfit penetrate through the abdominal wall through an incision arranged on the abdominal wall of a patient in advance to enter the body cavity, and then the puncture needle is taken away, and the inner catheter is used as a passage for the instruments to enter and exit the body cavity. The introducer needle generally includes a handle portion, a shaft portion and a distal portion. For example, CN201611125444.3 entitled "improved bladeless visual puncture needle" is incorporated herein by reference, which is the puncture needle disclosed in the chinese invention application filed on 12/9/2016. The puncture tube component formed by the telescopic bottom shell component can be contracted into the shortest length at the initial position, and then is matched with the improved knife-free visual puncture needle to form a puncture device for penetrating through the abdominal wall, and the puncture needle is taken away, and then the outer catheter and the inner catheter are rotated relatively, so that the fixed depth of the puncture tube component on the abdominal wall is adjusted, and the external section (length H1), the body wall section (length H2) and the internal section (length H3) of the puncture tube component are ideally arranged. A retractable puncture needle can also be designed to match the retractable puncture tube assembly.

Many different embodiments and examples of the invention have been shown and described. The individual embodiments each contain typically different distinguishing features, which can be interchanged or superimposed on one another. One of ordinary skill in the art can adapt the methods and apparatus described herein by making appropriate modifications without departing from the scope of the invention. Several modifications have been mentioned, and other modifications will occur to those skilled in the art. The scope of the invention should, therefore, be determined with reference to the appended claims, and not be construed as limited to the details of structure, materials, or acts shown and described in the specification and drawings.