CN111938780B

CN111938780B - Elongated tube assembly including radial retention block for surgical use

Info

Publication number: CN111938780B
Application number: CN202010826841.3A
Authority: CN
Inventors: 张媛
Original assignee: Shandong Nandao North Digital Technology Co ltd
Current assignee: Shandong Nandao North Digital Technology Co.,Ltd.
Priority date: 2020-08-17
Filing date: 2020-08-17
Publication date: 2021-10-08
Anticipated expiration: 2040-08-17
Also published as: CN113576619A; CN111938780A

Abstract

The invention discloses an elongated tube assembly containing a radial fixture block for a surgical operation, which comprises an outer sleeve, an inner sleeve and the radial fixture block, wherein the outer sleeve is fixedly connected with the inner sleeve; the outer cannula including an outer cannula proximal end and an outer cannula distal end and an outer cannula wall extending therebetween, the outer cannula distal end proximal region including a radial channel penetrating the outer cannula wall; the inner sleeve comprises an inner sleeve proximal end and an inner sleeve distal end and an inner sleeve wall extending therebetween, the inner sleeve being mounted inside the outer sleeve for axial movement relative thereto; the outer surface of the inner sleeve wall comprises a plurality of axially and uniformly distributed outer ring teeth; the radial clamping block comprises a clamping block proximal end, a clamping block distal end and an arc-shaped clamping block body extending between the clamping block proximal end and the clamping block distal end, and the inner arc side surface of the arc-shaped clamping block body comprises a locking tooth matched with the outer ring tooth; the inner sleeve is mounted in the outer sleeve and can move axially relative to the outer sleeve, the radial clamping block is mounted in the radial through groove, and the locking teeth are meshed with the outer ring teeth.

Description

Elongated tube assembly including radial retention block for surgical use

Technical Field

The invention relates to a minimally invasive surgical instrument, in particular to an elongated tube assembly containing a radial clamping block for surgical operation.

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 cannula assembly and a needle. 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 cannula 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 cannula assembly as a passage for the instrument 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. Cannula assemblies typically consist 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 cannula assembly penetrates from outside the body cavity to inside the body cavity to serve as a passage for instruments to and from 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 cannula assembly is secured to the abdominal wall of a patient, the hollow cannula 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 external section of the body cannot be reserved too long or too short, which is inconvenient for inserting the instruments, especially when the cannula assembly is used as a main operation hole and needs to be repeatedly switched, the length H1 of the external section of the body is too short, which is inconvenient for operating the instruments 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 pipe of the sleeve pipe 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 present invention, an elongate tube assembly for surgical use including a radial cartridge is provided, including an outer sleeve, an inner sleeve, and a radial cartridge. The outer sleeve includes an outer sleeve proximal end and an outer sleeve distal end and an outer sleeve wall extending therebetween, the outer sleeve distal end proximal region including a radial channel penetrating the outer sleeve wall. The inner sleeve comprises an inner sleeve proximal end and an inner sleeve distal end and an inner sleeve wall extending therebetween, the inner sleeve being mounted inside the outer sleeve for axial movement relative thereto; the outer surface of the inner sleeve wall comprises a plurality of axially and uniformly distributed outer ring teeth. The radial clamping block comprises a clamping block proximal end, a clamping block distal end and an arc-shaped clamping block body extending between the clamping block proximal end and the clamping block distal end, and the inner arc side surface of the arc-shaped clamping block body comprises a locking tooth matched with the outer ring tooth. The inner sleeve is mounted in the outer sleeve and can move axially relative to the outer sleeve, the radial clamping block is mounted in the radial through groove, and the locking teeth are meshed with the outer ring teeth.

In one embodiment, the elongated tube assembly further comprises an elastic ring, the elastic ring is wrapped outside the outer sleeve and the radial clamping block and is in a stretching state and generates a hoop tension, and the hoop tension enables the radial clamping block to move towards the axial direction of the outer sleeve.

In another scheme, the outer surface of the outer sleeve wall in the region adjacent to the distal end of the outer sleeve comprises a circumferential groove, the outer arc side surface of the arc-shaped clamping block body comprises an outer groove, and the elastic ring is wrapped in the circumferential groove and the outer groove.

In another scheme, each outer ring tooth comprises an outer ring tooth root and an outer ring tooth tip, and when the inner sleeve is axially moved, the outer ring tooth tips push the locking teeth to enable the radial clamping blocks to move towards the direction away from the axis of the outer sleeve, so that the elastic ring is forced to stretch and deform; after the locking tooth crosses the outer ring tooth top, the elastic ring recovers to enable the radial clamping block to move towards the direction of the outer sleeve axis, and then the locking tooth is matched with the next outer ring tooth root.

In yet another aspect, the elongate tube assembly further comprises a sleeve lock comprising a sleeve tail and a sleeve head and a sleeve tube extending therebetween, the sleeve lock being mounted on the exterior of the outer sleeve for axial movement relative thereto.

In another scheme, the sleeve lock can axially move to the locking position along the outer sleeve, when the sleeve lock moves to the locking position, the sleeve head covers the outer part of the radial clamping block, and the radial clamping block is limited to move towards the direction away from the axis of the outer sleeve, so that relative movement of the locking teeth and the outer ring teeth is prevented, and axial movement of the inner sleeve relative to the outer sleeve is further limited.

In another aspect, the sleeve lock may be axially movable along the outer sleeve to an unlocking position, and when the sleeve lock is moved to the unlocking position, the radial latch is completely exposed outside the sleeve lock, and the radial latch may move in a direction away from the axis of the outer sleeve. In another scheme, the sealing device further comprises a sealing ring, wherein the sealing ring is fixed outside the proximal end of the inner sleeve, and the sealing ring is in contact with the inner wall of the outer sleeve, so that the proximal end of the inner sleeve and the outer sleeve form air seal.

In another aspect, a cannula assembly is provided, comprising: comprising the elongated tubular assembly of any one of claims 1-8, further comprising a sealing assembly, the proximal end of the elongated tubular assembly being coupled to and forming a gas tight seal with the distal end of the sealing assembly. .

In one aspect of the present invention, a cannula assembly is provided comprising a seal assembly and an elongated 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 proximal end of the elongated tube assembly is connected to and forms a seal with the distal end of the cartridge body. The elongated tube assembly includes an outer sleeve, a self-adaptive latch, and a traveling bolt. The outer sleeve comprises an outer sleeve proximal end, an outer sleeve distal end and an outer sleeve wall extending between the outer sleeve proximal end and the outer sleeve distal end, the outer surface of the outer sleeve wall comprises a first rib and a second rib extending from the outer sleeve distal end to the outer sleeve proximal end, a radial through groove is arranged between the first rib and the second rib and penetrates through the outer sleeve wall in the area adjacent to the outer sleeve distal end, the radial through groove comprises a proximal limiting edge and a distal limiting edge, and the outer sleeve further comprises a first sliding groove penetrating through the first rib and a second sliding groove penetrating through the second rib. The self-adaptive lock catch comprises a lock catch proximal end, a lock catch distal end and an arc lock catch body extending between the lock catch proximal end and the lock catch distal end, the self-adaptive lock catch is installed in the radial through groove, the lock catch proximal end is matched with the proximal limit edge, the lock catch distal end is matched with the distal limit edge, and the self-adaptive lock catch moves radially in the direction far away from the axis of the pipe. The movable bolt comprises a movable bolt tail, a movable bolt head and a bolt body extending between the movable bolt tail and the movable bolt head, and two sides of the bolt body comprise a first side lug and a second side lug; the movable bolt is arranged between the first rib and the second rib, wherein the first side lug is matched with the first sliding groove, and the second side lug is matched with the second sliding groove; the moving bolt is axially movable relative to the outer sleeve.

In one version, the moving bolt includes a locked position and an unlocked position; when the moving bolt moves to the locking position, the bolt head covers the outer part of the self-adaptive lock catch to limit the self-adaptive lock catch to move towards the direction far away from the axis of the outer sleeve; when the movable bolt moves to the unlocking position, the self-adaptive lock catch is completely exposed out of the movable bolt, and the self-adaptive lock catch can move towards the direction far away from the axis of the outer sleeve.

In yet another aspect, the elongate tube assembly further includes an inner sleeve including an inner sleeve proximal end and an inner sleeve distal end and an inner sleeve wall extending therebetween, the inner sleeve being mounted within the outer sleeve for axial movement relative to the outer sleeve. (ii) a

In another embodiment, the outer surface of the inner sleeve wall includes a plurality of axially uniformly distributed outer ring teeth, and the inner arc side of the arc-shaped latch body includes locking teeth matched with the outer ring teeth, and the locking teeth can be engaged with any one of the outer ring teeth, so as to limit the inner sleeve from moving axially relative to the outer sleeve.

In yet another aspect, the outer sleeve includes a circumferential cut that cuts away a portion of the wall in the vicinity of the radial channel and forms a first cut and a first circumferential recess through the first bead, while forming a second cut and a second circumferential recess through the second bead; the self-adaptive lock catch comprises a first elastic arm and a second elastic arm, wherein the first elastic arm and the second elastic arm extend outwards from the circumferential direction of the arc lock catch body, the first elastic arm is installed in a first circumferential concave pit and penetrates through a first cut, and the second elastic arm is installed in a second circumferential concave pit and penetrates through a second cut.

In yet another aspect, each of the outer ring teeth includes an outer ring tooth root and an outer ring tooth tip, and when the moving bolt is in the unlocking position, the inner sleeve is axially moved, and the outer ring tooth tip pushes the lock tooth to move the adaptive lock catch away from the axis of the outer sleeve, so that the first spring arm and the second spring arm are elastically deformed; after the lock tooth crosses the outer ring tooth crest, the elastic restoration of the first elastic arm and the second elastic arm enables the self-adaptive lock catch to move towards the direction of the outer sleeve axis, and then the lock tooth is matched with the tooth root of the next outer ring. In still another scheme, the height Hd1 of the outer ring teeth 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 another scheme, the device further comprises a sealing ring which is fixed outside the proximal end of the inner sleeve, and the sealing ring is in contact with the inner wall of the outer sleeve to enable the proximal end of the inner sleeve and the outer sleeve to form air seal

In a further aspect, a method of adjusting the length of an elongated tube assembly of a cannula assembly as in claim 5 is provided, comprising the steps of:

s1: moving the movable bolt from the far end to the near end until the self-adaptive lock catch is completely exposed out of the movable bolt;

s2: axially moving the inner sleeve to produce axial relative displacement with the outer sleeve, thereby adjusting the length of the elongated tube assembly to a proper position;

s3: and slightly moving the inner sleeve to enable the locking teeth and the outer ring teeth to be meshed with each other, and then moving the movable bolt from the near end to the far end until the bolt head of the movable bolt covers the outer part of the self-adaptive lock catch, so that the movement of the self-adaptive lock catch is limited, and the axial movement of the extension pipe relative to the base pipe is further limited.

In one aspect of the present invention, a cannula assembly is provided comprising a seal assembly and an elongated 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 proximal end of the elongated tube assembly is connected to and forms a seal with the distal end of the cartridge body. The elongated tube assembly includes an outer sleeve, an inner sleeve, and a radial cartridge. The outer cannula includes an outer cannula proximal end and an outer cannula distal end and an outer cannula wall extending therebetween, the outer cannula distal region including a radial through slot penetrating the outer cannula wall, the radial through slot including a proximal stop edge and a distal stop edge. The inner sleeve comprises an inner sleeve proximal end and an inner sleeve distal end and an inner sleeve wall extending therebetween, the inner sleeve being mounted inside the outer sleeve for axial movement relative thereto; the outer surface of the inner sleeve wall comprises a plurality of axially and uniformly distributed outer ring teeth. The radial clamping block comprises a clamping block proximal end, a clamping block distal end and an arc-shaped clamping block body extending between the clamping block proximal end and the clamping block distal end, and the inner arc side surface of the arc-shaped clamping block body comprises a locking tooth matched with the outer ring tooth. The inner sleeve is mounted in the outer sleeve and can axially move relative to the outer sleeve, the radial clamping block is mounted in the radial through groove, and the near end of the clamping block is matched with the near-end limiting edge; the far end of the fixture block is matched with the far-end limiting edge, so that the radial fixture block is limited to move along the axial direction; and the locking teeth are meshed with the outer ring teeth. In one embodiment, the elongated tube assembly further comprises an elastic ring, the elastic ring is wrapped outside the outer sleeve and the radial clamping block and is in a stretching state and generates a hoop tension, and the hoop tension enables the radial clamping block to move towards the axial direction of the outer sleeve.

In another scheme, two radial through grooves and two radial clamping blocks are respectively arranged in the radial through grooves.

In yet another aspect, the elongate tube assembly further comprises a sleeve lock comprising a sleeve tail and a sleeve head with a sleeve tube extending therebetween; the sleeve lock is mounted on the exterior of the outer sleeve for axial movement relative thereto.

In yet another aspect, the sleeve lock includes a locked position and an unlocked position; when the sleeve lock moves to the locking position, the sleeve head wraps the outer part of the radial clamping block to limit the radial clamping block to move towards the direction far away from the axis of the outer sleeve; when the sleeve lock moves to the unlocking position, the radial clamping block is completely exposed outside the sleeve lock, and the radial clamping block can move towards the direction far away from the axis of the outer sleeve.

In another embodiment, each of the outer ring teeth includes an outer ring tooth root and an outer ring tooth tip, and when the sleeve lock moves to the unlocking position and the inner sleeve is axially moved, the outer ring tooth tip pushes the locking tooth to move the radial clamping block in a direction away from the axis of the outer sleeve, so that the elastic ring is forced to be stretched and deformed; after the locking tooth crosses the outer ring tooth top, the elastic ring recovers to enable the radial clamping block to move towards the direction of the outer sleeve axis, and then the locking tooth is matched with the next outer ring tooth root.

In still another scheme, the height Hd1 of the outer ring teeth 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 another scheme, the sealing device further comprises a sealing ring, wherein the sealing ring is fixed outside the proximal end of the inner sleeve, and the sealing ring is in contact with the inner wall of the outer sleeve, so that the proximal end of the inner sleeve and the outer sleeve form air seal.

In a further aspect, a method of adjusting the length of an elongate tube assembly of a cannula assembly as in claim 8 is provided, comprising the steps of:

s1: moving the sleeve lock from the far end to the near end until all the radial clamping blocks are exposed outside the sleeve lock;

s3: the inner sleeve is slightly moved to enable the locking teeth and the outer ring teeth to be meshed with each other, and then the sleeve lock is moved from the near end to the far end until a sleeve head of the sleeve lock is wrapped outside the radial clamping block, so that the radial clamping block is limited to move, and the inner sleeve is further limited to move axially relative to the outer sleeve.

In one aspect of the invention, a puncture instrument is provided that includes a cannula assembly and a puncture needle extending through the cannula 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 an exploded view of elongated tube assembly 3;

FIG. 4 is a perspective view of the outer sleeve 300;

FIG. 5 is a perspective view of the adaptive latch 500;

figure 6 is a side view of elongate tube assembly 3;

FIG. 7 is a cross-sectional view taken from 7-7 of FIG. 6;

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

FIG. 9 is an enlarged cross-sectional view taken at 9-9 of FIG. 7;

FIG. 10 is a perspective view of cannula assembly 1;

figure 11 is an exploded view of the elongate tube assembly 3 a;

FIG. 12 is a perspective view of the outer sleeve 300 a;

fig. 13 is a perspective view of the radial latch 500 a;

FIG. 14 is a perspective view of the sleeve lock 80;

figure 15 is a side view of the elongate tube assembly 3 a;

FIG. 16 is a cross-sectional view of 16-16 of FIG. 15;

FIG. 17 is an enlarged view of 17-17 of FIG. 16;

FIG. 18 is an enlarged cross-sectional view taken at 18-18 of FIG. 16;

FIG. 19 is a perspective view of the cannula assembly 1 a;

FIG. 20 is a perspective view of the modified lower capsule 230;

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.

Fig. 1-13 depict a cannula assembly 1 for laparoscopic surgery. The cannula assembly 1 includes a seal assembly 2 and an elongate tube assembly 3. Fig. 1-2 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 262 of the component 200 and the locking hook 112 of the component 100 are matched and fastened. The hook 112 and the slot 262 are matched to be quickly disassembled 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, a threaded connection or other quick-locking structure can be adopted. Alternatively, the assembly 100 and the assembly 200 may be designed in a configuration that is not quickly detachable.

1-2, the first seal assembly 100 comprises a first seal housing 110, a first seal cartridge 190 and an instrument seal assembly 180 sandwiched therebetween. The housing wall 191 of the first seal cartridge 190 is secured to the housing wall 111 of the first seal mount 110 by ultrasonic welding, such that the proximal end 181 of the instrument seal assembly 180 forms an air tight seal with the perimeter of the first seal mount.

1-2, the second seal assembly 200 comprises a second seal cartridge 230, a second seal housing 260 and a zero seal 250 sandwiched therebetween. The second capsule 230 comprises a proximal cartridge body end 232 and a distal cartridge body end 234 and a wall portion 235 extending therebetween. The second capsule 230 further comprises an inner wall 236 and an air valve mounting hole 237 communicating with the inner wall. The valve spool 280 is mounted in the valve body 270 and together in the mounting hole 237. The flange 256 of the zero seal 250 is sandwiched between the inner wall 236 and the second seal housing 260, and the 4 mounting posts 268 of the second seal housing 260 in this embodiment are in interference fit with the 4 mounting holes 238 (not shown) of the second cartridge 230, such that the flange 256 forms an air tight seal with the inner wall 236. In this embodiment, the zero seal 250 includes a single slit duckbill 253, which duckbill 253 opens when an external instrument is passed through the zero seal 250, and which duckbill 253 automatically closes when the instrument is removed.

Fig. 4-7 depict the structure and composition of elongate tube assembly 3, which elongate tube assembly 3 includes outer sleeve 300, inner sleeve 400, and adaptive latch 500. Fig. 4 depicts the structure and composition of the outer sleeve 300. The outer cannula 300 includes an outer cannula proximal end 310 and an outer cannula distal end 330 and an outer cannula wall 320 extending therebetween. The outer sleeve wall 320 defines a first hollow passage 321. The exterior of the outer sleeve wall 320 includes first ribs 340 and second ribs 350 extending from the distal end of the outer sleeve to the proximal end thereof. The radial through slots 360 are disposed between the first ribs 340 and the second ribs 350 and penetrate the outer cannula wall in the area adjacent the outer cannula distal end 330. The radial channel 360 includes a proximal limit edge 361 and a distal limit edge 369. The outer sleeve 300 further comprises a circumferential cut 370, the circumferential cut 370 cutting away a portion of the tubular wall in the vicinity of the radial channel 360 and forming a first cut 341 and a first circumferential recess 371 through the first ribs 340, and a second cut 351 and a second circumferential recess 373 through the second ribs 350. The first cutout 341 includes a first top edge 343, and the second cutout 351 includes a second top edge 353 (refer to fig. 9).

As shown in fig. 3, the inner cannula 400 includes an inner cannula proximal end 410 and an inner cannula distal end 430 with an inner cannula wall 420 extending therebetween. The inner surface of the inner cannula wall defines a second hollow passage 421 and the inner cannula distal end 430 defines an open tube lip 431. The outer surface of the inner sleeve wall 420 comprises a plurality of outer ring teeth 440, the plurality of outer ring teeth 440 are evenly distributed on the outer surface of the inner sleeve wall along the axial direction thereof, the plurality of outer ring teeth 440 form a non-slip region 460, and the non-slip region 460 extends from the outer surface of the inner sleeve proximal end 410 to the inner sleeve distal end 430. In an alternative arrangement, the distance Dx between the non-slip region 460 and the distal end 330 of the inner cannula is 20mm or more and 30mm or less. Each of the outer ring teeth 440 includes an outer ring tip 441 and an outer ring root 449 (see fig. 8).

As shown in fig. 5, the adaptive latch 500 includes a latch proximal end 510 and a latch distal end 530 and an arcuate latch body 520 extending therebetween. The inner arc side of the arc-shaped locking buckle body 520 comprises a locking tooth 540 matched with the outer ring tooth. The locking teeth 540 in this example comprise 3 teeth, however, it may comprise only one tooth, or more teeth. The adaptive latch 500 further includes a first resilient arm 550 and a second resilient arm 560 extending circumferentially outward from the curved latch body 520.

Figures 6-10 depict the assembled relationship of elongate tube assembly 3. The inner sleeve 400 is mounted inside the outer sleeve 300 with the outer sleeve wall 420 sized and shaped to fit within the first hollow passage 321, the inner sleeve being axially movable relative to the outer sleeve. As shown in fig. 6-7, the adaptive latch 500 is mounted in the radial channel 360, wherein the latch proximal end 510 mates with the proximal stop edge 361; the latch distal end 530 mates with the distal stop edge 369 to limit axial movement of the adaptive latch, but the adaptive latch may move radially away from the tube axis. The locking teeth 540 can engage with any of the outer ring teeth 440 to limit axial movement of the inner sleeve relative to the outer sleeve. 7-9, the first resilient arm 550 is mounted in a first circumferential recess 371 and passes through the first cutout 341, and the exterior of the first resilient arm 550 contacts the first top edge 343; the second elastic arm 560 is installed in the second annular recess 373 and passes through the second notch 351, and the outer surface of the second elastic arm 560 contacts the second top edge 353.

As shown in fig. 6-9, the elongate tube assembly 3 further comprises a travel pin 50. The movable bolt 50 includes a movable bolt tail 51, a movable bolt head 53 and a bolt body 52 extending therebetween, and both sides of the bolt body include a first side ear 57 (not shown) and a second side ear 59 (not shown). The shift bolt 50 is mounted between the first rib 340 and the second rib 350, wherein the first side lug 57 mates with the first runner 349 and the second side lug 59 mates with the second runner 359, and the first and second side lugs are movable in the first and second runners such that the shift bolt is axially movable relative to the outer sleeve. Those skilled in the art should readily understand that the first and second side lugs may be a simple sliding groove mechanism formed by a sliding groove and a simple structure such as a cylinder, a rectangular block, etc., and thus will not be described in detail. The movable bolt can move axially along the outer sleeve to a locking position or an unlocking position, and when the movable bolt moves to the locking position, the movable bolt locks the self-adaptive lock catch, so that the inner sleeve is limited to move axially relative to the outer sleeve; the inner sleeve is axially movable relative to the outer sleeve when the movable bolt is moved to the unlocked position.

As shown in fig. 6-9, when the moving bolt 50 moves to the locking position, the bolt head 53 covers the outside of the adaptive lock 500, and limits the adaptive lock 500 from moving away from the axis of the outer sleeve, thereby preventing the lock 540 and the outer ring gear 440 from moving relative to each other, and further limiting the inner sleeve 400 from moving axially relative to the outer sleeve 500. Still referring to fig. 6-9, but imagine that moving the moving bolt 50 from the distal end to the proximal end until the adaptive latch 500 is completely exposed outside of the moving bolt 50, i.e., moving the moving bolt to the unlocked position, the adaptive latch 500 can move away from the outer cannula axis. When the moving bolt is in the unlocking position (neglecting the moving bolt in fig. 8-9), when the inner sleeve 400 is axially moved, the outer ring tooth top 441 pushes the lock tooth 540 so that the adaptive lock catch 500 moves away from the outer sleeve axis, and the first elastic arm 550 and the second elastic arm 560 are forced to elastically deform; after the lock tooth 540 passes over the top of the outer ring tooth 441, the first resilient arm 550 and the second resilient arm 560 resiliently return to allow the self-adaptive latch 500 to move toward the outer sleeve axis, and the lock tooth 540 is matched with the next outer ring tooth root 449. This is repeated so as to achieve axial movement of the inner sleeve relative to the outer sleeve.

Referring to fig. 7, the elongated tube assembly 3 further comprises a sealing ring 40, wherein the sealing ring 40 is fixed outside the proximal end 410 of the inner cannula, and can be fixed by glue or interference fit with the proximal end 410 of the inner cannula by means of the elastic deformability of the sealing ring 40 itself. The sealing ring 40 contacts the inner wall of the outer sleeve 300 to hermetically seal the inner sleeve proximal end 410 to the outer sleeve 300.

As shown in fig. 10, the cannula assembly 1 comprises a seal assembly 2 and an elongate tube assembly 3, the proximal end of the elongate tube assembly 3 being connected to the distal end of the seal assembly 2 and forming a gas tight seal. The second sealing assembly 200 comprises a second sealing cartridge 230, wherein the second sealing cartridge 230 has a distal cartridge body end 234 with a shape and size matching the proximal outer cannula end 310, and the distal cartridge body end 234 is connected to and forms a gas-tight seal with the proximal outer cannula end 310. In one scheme, the distal end 234 of the bin body is firmly connected with the proximal end 310 of the outer sleeve by a glue bonding method to form a hermetic seal; another method employs an interference fit to securely couple and form an air tight seal between the cartridge body distal end 234 and the outer cannula proximal end 310. In addition to the above-listed methods, the method of attaching the sealing assembly 2 to the elongated tubular assembly 3 can include a variety of means. For example, a sealing ring is added to the exterior of the tip of the outer cannula 300, and the outer cannula tip and the distal end of the cartridge body are securely connected and form an air-tight seal by a conventional snap-fit or threaded connection.

In one design, the height Hd1 of the outer ring gear 440 is equal to the shortest distance between the tooth top and the tooth bottom, wherein 0.3mm Hd1 mm 0.5mm, when Hd1 is smaller than 0.3mm, the outer ring gear is difficult to manufacture, the depth of the engagement between the outer ring gear 440 and the locking teeth 540 is too shallow, and the friction force of the outer ring gear wrapped on the abdominal wall wound of the patient is insufficient; when Hd1 is larger than 0.5mm, the outer diameter of the inner cannula needs to be increased to ensure sufficient strength, so that the puncture wound is damaged, and when the outer ring teeth are wrapped on the abdominal wall wound of a patient, the outer ring teeth with the height of more than 0.5 are easy to cause additional damage to the wound.

It will be appreciated by those skilled in the art that when cannula assembly 1 is used in laparoscopic surgery, the surgeon may vary the overall length of the elongated tube assembly of the cannula assembly and adjust the fixed depth of the cannula assembly in the abdominal wall based on the thickness of the patient's abdominal wall, the position and angle of penetration of the cannula assembly, and the individual handling habits, etc., so that the desired placement of the cannula assembly external section (length H1), the body wall section (length H2), and the internal section (length H3) is achieved. A method of adjusting the length of an elongated tube assembly of a cannula assembly 1, comprising the steps of:

s3: the inner sleeve is slightly moved to enable the locking teeth and the outer ring teeth to be meshed with each other, and then the moving bolt moves from the near end to the far end until the bolt head of the moving bolt covers the outer part of the self-adaptive lock catch, so that the movement of the self-adaptive lock catch is limited, and the axial movement of the inner sleeve relative to the outer sleeve is further limited.

Figures 11-18 depict the structure and composition of yet another elongate tube assembly 3 a. The elongated tube assembly 3a includes an outer sleeve 300a, an inner sleeve 400, a radial spline 500a and a resilient ring 60. Fig. 12 depicts the structure and composition of the outer sleeve 300 a. The outer cannula 300 includes an outer cannula proximal end 310 and an outer cannula distal end 330 and an outer cannula wall 320 extending therebetween. The outer sleeve wall 320 defines a first hollow passage 321. The vicinity of the outer cannula distal end 330 comprises a radial through slot 360a through the outer cannula wall 320, the radial through slot 360a comprising a proximal stop edge 361a and a distal stop edge 369 a. The outer surface of the outer cannula wall in the vicinity of the distal end of the outer cannula also includes circumferential grooves 370 a. In this example, the outer sleeve 300a includes two radial through slots, but may include only one radial through slot, or more radial through slots.

Referring to fig. 13, the radial latch 500a includes a latch proximal end 510a and a latch distal end 530a and an arcuate latch body 520a extending therebetween, and an inner arcuate side surface of the arcuate latch body 520a includes a locking tooth 540a that mates with the outer ring tooth. The outer arc side of the arc-shaped chuck body 520a includes an outer groove 570 a.

Figures 15-18 depict the assembled relationship of the elongate tube assembly 3 a. The inner sleeve 400 is mounted inside the outer sleeve 300a, the inner sleeve being axially movable relative to the outer sleeve. The radial latch 500a is mounted in the radial through groove 360a, wherein the latch proximal end 510a is matched with the proximal limit edge 361 a; the cartridge distal end 530a mates with the distal stop edge 369a to limit axial movement of the radial cartridge, but the radial cartridge may move radially away from the tube axis. The locking teeth 540a engage the outer ring teeth 440. In this example, the outer sleeve 300a includes 2 identical radial through slots 360a, and two radial clips 500a are respectively inserted into the radial through slots. The elastic ring 60 is covered outside the outer sleeve 300a and the radial latch 500a, is in a tensile state, and generates a hoop tension force, and the hoop tension force enables the radial latch to move towards the axial direction of the outer sleeve. In one embodiment, the resilient ring 60 is wrapped in the circumferential groove 370a and the outer groove 570a and is under tension and generates a hoop tension that moves the radial catches towards the outer sleeve axis.

The elongated tube assembly 3a further comprises a sleeve lock 80, the sleeve lock 80 comprising a sleeve tail 81 and a sleeve head 83 with a sleeve tube 82 extending therebetween, the sleeve tube defining a fourth hollow tube 89, the sleeve tail 81 further comprising an anti-slip handle 85. The sleeve lock 80 is mounted on the exterior of the outer sleeve 300a for axial movement relative thereto. The sleeve lock 80 includes a locked position and an unlocked position; when the sleeve lock 80 moves to the locking position, the sleeve head 83 wraps the outside of the radial clamping block 500a, and the radial clamping block is limited from moving in the direction away from the axis of the outer sleeve; when the sleeve lock 80 moves to the unlocking position, the radial latch 500a is completely exposed outside the sleeve lock, and the radial latch can move towards the direction away from the axis of the outer sleeve.

In particular, as shown in fig. 16-18, when the sleeve lock 80 is moved to the locking position, any one of the outer ring teeth 440 and the locking teeth 540a are engaged with each other, and the sleeve head 83 is wrapped around the outer portion of the radial latch 500a to limit the radial latch from moving in a direction away from the axis of the outer sleeve, so that the outer ring teeth 440 and the locking teeth 540a cannot be disengaged, thereby limiting the inner sleeve from moving axially relative to the outer sleeve. When the sleeve lock 80 is in the unlocked position (neglecting the sleeve locks in fig. 16-18), when the inner sleeve 400 is axially moved, the outer ring tooth tip 441 pushes the locking teeth 540a to move the radial latch 500a away from the outer sleeve axis, forcing the elastic ring 60 to elongate and deform; after the locking tooth 540a has passed the top of the outer ring tooth 441, the resilient ring 60 is restored such that the radial latch 500a moves in the direction of the outer sleeve axis, and the locking tooth 540a mates with the next outer ring tooth root 449. This is repeated so as to achieve axial movement of the inner sleeve relative to the outer sleeve.

Referring to fig. 16, the elongated tube assembly 3 further comprises a sealing ring 40, wherein the sealing ring 40 is fixed outside the proximal end 410 of the inner cannula, and can be fixed by glue or interference fit with the proximal end 410 of the inner cannula by virtue of the elastic deformability of the sealing ring 40 itself. The sealing ring 40 contacts the inner wall of the outer sleeve 300 to hermetically seal the inner sleeve proximal end 410 to the outer sleeve 300.

Referring to fig. 19, the cannula assembly 1a includes a seal assembly 2 and an elongate tube assembly 3a, the proximal end of the elongate tube assembly 3a being connected to and forming a gas tight seal with the distal end of the seal assembly 2. The second sealing assembly 200 comprises a second sealing cartridge 230, wherein the second sealing cartridge 230 has a distal cartridge body end 234 with a shape and size matching the proximal outer cannula end 310, and the distal cartridge body end 234 is connected to and forms a gas-tight seal with the proximal outer cannula end 310.

It will be appreciated by those skilled in the art that when cannula assembly 1a is used in laparoscopic surgery, the surgeon may vary the overall length of the elongated tube assembly of the cannula assembly and adjust the fixed depth of the cannula assembly in the abdominal wall according to the thickness of the abdominal wall of the patient, the position and angle of penetration of the cannula assembly, and the individual handling habits, etc., so as to achieve the desired arrangement of the external portion (length H1), the internal portion (length H2) and the internal portion (length H3) of the cannula assembly. Cannula assembly 1a may be formed with smaller, more elaborate, and space-saving elongated tube assemblies than cannula assembly 1. The method for adjusting the length of the elongated tube assembly of the sleeve assembly 1a comprises the steps of:

In the case shown, the sleeve assembly is divided into a sealing assembly and an elongated tubular assembly, the outer sleeve of which is connected to the lower capsule of the sealing assembly, but the outer sleeve may also be integrally formed as a single piece with the lower capsule. As shown in fig. 20, in an alternative aspect, the second seal cartridge 230 comprises a cartridge body proximal end 232 and a cartridge body distal end 234, the cartridge body distal end 234 extending distally to form the outer sleeve 300, and a wall portion 235 extending therebetween. The outer cannula 300 includes an outer cannula proximal end 310 and an outer cannula distal end 330 and an outer cannula wall 320 extending therebetween. The outer sleeve wall 320 defines a first hollow passage 321. The vicinity of the outer cannula distal end 330 comprises a radial through slot 360a through the outer cannula wall 320, the radial through slot 360a comprising a proximal stop edge 361a and a distal stop edge 369 a. The outer surface of the outer cannula wall in the vicinity of the distal end of the outer cannula also includes circumferential grooves 370 a.

Those skilled in the art will readily appreciate that the cannula assembly also requires a mating needle. The puncture needle penetrates through the sleeve assembly to form a puncture outfit, then penetrates 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 sleeve 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 sleeve assembly formed by the telescopic bottom shell assembly can be contracted into the shortest length of the initial position, and then is matched with the improved knife-free visual puncture needle to form the puncture needle for penetrating through the abdominal wall, the outer sleeve and the inner sleeve are relatively rotated after the puncture needle is taken away, and further the fixed depth of the sleeve assembly on the abdominal wall is adjusted, so that the external section (length H1), the body wall section (length H2) and the internal section (length H3) of the sleeve assembly reach ideal settings. A retractable needle may also be designed to mate with the retractable cannula 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.

Claims

1. An elongated tube assembly for surgical use comprising a radial cartridge, wherein: comprises an outer sleeve, an inner sleeve and a radial clamping block; the outer cannula including an outer cannula proximal end and an outer cannula distal end and an outer cannula wall extending therebetween, the outer cannula distal end proximal region including a radial channel penetrating the outer cannula wall; the inner sleeve comprises an inner sleeve proximal end and an inner sleeve distal end and an inner sleeve wall extending therebetween, the inner sleeve being mounted inside the outer sleeve so as to be axially movable relative to the outer sleeve; the outer surface of the inner sleeve wall comprises a plurality of axially and uniformly distributed outer ring teeth; the radial clamping block comprises a clamping block proximal end, a clamping block distal end and an arc-shaped clamping block body extending between the clamping block proximal end and the clamping block distal end, and the inner arc side surface of the arc-shaped clamping block body comprises a locking tooth matched with the outer ring tooth; the radial clamping block is arranged in the radial through groove, and the locking teeth are meshed with the outer ring teeth; the elongated tube assembly further comprises an elastic ring, the elastic ring is wrapped outside the outer sleeve and the radial clamping blocks and is in a stretching state and generates hoop tightening force, and the hoop tightening force enables the radial clamping blocks to move towards the axial direction of the outer sleeve.

2. The elongated tube assembly of claim 1, wherein an outer surface of the outer sleeve wall in a region adjacent the distal end of the outer sleeve comprises circumferential grooves, wherein outer arcuate sides of the arcuate clip bodies comprise outer grooves, and wherein the elastomeric ring is encased in the circumferential grooves and the outer grooves.

3. The elongated tube assembly of claim 1, wherein each of the outer ring teeth includes an outer ring tooth base and an outer ring tooth tip, wherein upon axially moving the inner sleeve, the outer ring tooth tips push against the locking teeth to move the radial dogs away from the outer sleeve axis to force the resilient ring to stretch; after the locking tooth crosses the outer ring tooth top, the elastic ring recovers to enable the radial clamping block to move towards the direction of the outer sleeve axis, and then the locking tooth is matched with the next outer ring tooth root.

4. The elongate tube assembly of claim 2, wherein: the elongated tube assembly also includes a sleeve lock including a sleeve tail and a sleeve head and a sleeve tube extending therebetween, the sleeve lock being mounted on an exterior of the outer sleeve for axial movement relative thereto.

5. The elongated tube assembly of claim 4, wherein the sleeve lock is axially movable along the outer sleeve to a locked position, and wherein when the sleeve lock is moved to the locked position, the sleeve head covers an exterior of the radial latch to limit movement of the radial latch in a direction away from an axis of the outer sleeve to prevent relative movement of the lock teeth and the outer ring teeth, thereby limiting axial movement of the inner sleeve relative to the outer sleeve.

6. The elongated tube assembly of claim 5, wherein the sleeve lock is axially movable along the outer sleeve to an unlocked position, and wherein the radial latch is fully exposed outside of the sleeve lock when the sleeve lock is moved to the unlocked position, the radial latch being movable away from the axis of the outer sleeve.

7. The elongate tube assembly of claim 6, wherein: the sealing ring is fixed outside the near end of the inner sleeve and is in contact with the inner wall of the outer sleeve, so that the near end of the inner sleeve and the outer sleeve form air seal.