CN111928037A

CN111928037A - Rotary buckle type telescopic sleeve assembly

Info

Publication number: CN111928037A
Application number: CN202010784016.1A
Authority: CN
Inventors: 曾国庆
Original assignee: Chongqing Chengyi Technology Co ltd
Current assignee: Chongqing Chengyi Technology Co ltd
Priority date: 2020-08-06
Filing date: 2020-08-06
Publication date: 2020-11-13

Abstract

The invention discloses a rotary buckle type telescopic sleeve assembly, which comprises an upper shell, a lower shell assembly, an instrument seal and a zero seal, wherein the instrument seal and the zero seal are arranged between the upper shell and the lower shell assembly; the first sleeve proximal end is connected with the lower shell component, the second sleeve proximal end is mounted inside the first sleeve, and the first sleeve and the second sleeve comprise a first rotary clamping state, a second rotary clamping state and an active state; under the first and second rotary clamping states, the second sleeve can rotate around the axis of the sleeve relative to the first sleeve but cannot move axially; in the active state, the second sleeve is axially movable relative to the first sleeve.

Description

Rotary buckle type telescopic sleeve assembly

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 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 are typically comprised of a cannula, 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 sleeve, 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 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 sleeve 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, a rotating snap-in retractable sleeve assembly is provided that includes an upper housing and a lower housing assembly, and an instrument seal and a zero seal mounted between the upper housing and the lower housing assembly. The lower housing component includes a first sleeve including a first sleeve proximal end and a first sleeve distal end and a first sleeve wall extending therebetween, and a second sleeve including a second sleeve proximal end and a second sleeve distal end and a second sleeve wall extending therebetween. The first sleeve proximal end is connected with the lower housing component, the second sleeve proximal end is mounted inside the first sleeve, and the first sleeve and the second sleeve comprise a first rotary clamping state, a second rotary clamping state and an active state. Under the first and second rotary clamping states, the second sleeve can rotate around the axis of the sleeve relative to the first sleeve but cannot move axially; in the active state, the second sleeve is axially movable relative to the first sleeve.

In one embodiment, the outer surface of the proximal end of the second sleeve comprises a first outer rib and a first outer notch with a thickness H; the inner surface of the first sleeve wall comprises a first group of inner ribs, and the first group of inner ribs comprises a near-end inner groove and a far-end inner groove which are arranged at a distance of B1; wherein H is less than or equal to B1.

In yet another alternative, the first external bead and the proximal internal groove cooperate to form a first rotational snap-fit that is rotatable about the cannula axis and non-axially movable.

In yet another alternative, the first external ribs and the distal internal grooves cooperate to form a second rotational snap-fit that is rotatable about the cannula axis and non-axially movable.

In another scheme, the distribution area angle of the first group of inner ribs in the circumferential direction of the first sleeve is A1, and the distribution area angle of the first outer notches in the circumferential direction of the second sleeve is ANG1, wherein ANG1 is more than or equal to A1; when the first group of inner ribs are aligned with the first outer notches, the second sleeve can axially move relative to the first sleeve.

In yet another embodiment, the system further comprises a casing seal mounted to the first pipe end. The cannula seal comprises a proximal elastomeric ring having an inner diameter Dt1 and a distal elastomeric ring having an inner diameter Dt 3; the far-end elastic ring is in interference fit with the first outer cylindrical surface. In yet another alternative, the cannula seal is made of a thermoset elastomer or a thermoplastic elastomer material, and the interference fit between the distal resilient ring of the cannula seal and the first outer cylindrical surface presses against the cannula seal to form a peak rotational force F1; a rotary external force F2 is exerted on the first sleeve and the second sleeve, and when F2 is less than or equal to F1, the first sleeve and the second sleeve do not generate relative rotary displacement; when F2 is larger than F1, the first sleeve and the second sleeve generate relative rotation displacement.

In one aspect of the present invention, a rotating snap-in retractable sleeve assembly is provided that includes an upper housing and a lower housing assembly, and an instrument seal and a zero seal mounted between the upper housing and the lower housing assembly. The lower housing component includes a first sleeve including a first sleeve proximal end and a first sleeve distal end and a first sleeve wall extending therebetween, and a second sleeve including a second sleeve proximal end and a second sleeve distal end and a second sleeve wall extending therebetween. The first sleeve wall comprises an inner convex rib and an inner notch, the near end of the second sleeve comprises an outer convex rib and an outer notch, the shape and the size of the inner convex rib are matched with those of the outer notch, and the shape and the size of the outer convex rib are matched with those of the inner notch; the inner ribs include proximal inner grooves and distal inner grooves. The proximal end of the first sleeve is connected to the lower housing assembly and the proximal end of the second sleeve is mounted within the first sleeve. The sleeve assembly comprises a shortest state, and when the sleeve assembly is in the shortest state, the outer convex ribs and the inner grooves at the near end are matched with each other to form a rotary buckle fit which can rotate around the axis of the sleeve and cannot move axially.

In one embodiment, the sleeve assembly further comprises an active state, wherein the inner rib is aligned with the outer notch, and the second sleeve is axially movable relative to the first sleeve when the outer rib is aligned with the inner notch.

In yet another aspect, the cannula assembly further comprises a longest position in which the external ribs and the internal distal recesses mate with each other to form a rotational snap fit that is rotatable about the cannula axis and non-axially moveable.

In yet another aspect, the cannula assembly may transition from a shortest state to an active state and then from the active state to a longest state.

In another embodiment, the pipe joint further comprises a casing seal mounted at the first pipe end. The cannula seal comprises a proximal elastomeric ring having an inner diameter Dt1 and a distal elastomeric ring having an inner diameter Dt 3; the far-end elastic ring is in interference fit with the first outer cylindrical surface. In another embodiment, the sleeve seal is made of a thermosetting elastomer or thermoplastic elastomer material, and the interference fit between the distal elastic ring of the sleeve seal and the first outer cylindrical surface forms a rotational peak force F1; a rotary external force F2 is exerted on the first sleeve and the second sleeve, and when F2 is less than or equal to F1, the first sleeve and the second sleeve do not generate relative rotary displacement; when F2 is larger than F1, the first sleeve and the second sleeve generate relative rotation displacement.

In one aspect of the present invention, a method for adjusting a length of a cannula assembly is provided, comprising the steps of:

s1: rotating the second sleeve to align the inner convex rib with the outer gap and align the outer convex rib with the inner gap;

s2: axially moving the second sleeve so that the side of the bead aligns with the distal groove;

s3: the second cannula is rotated so that the male ribs mate with the distal female grooves to form a rotational snap fit that can rotate about the cannula axis but cannot move axially.

In one aspect of the present invention, a swivel snap-in lower housing assembly is provided that includes a lower housing, a first bushing, and a second bushing. The lower housing includes a distal shell with one end of the transition shell connected to the distal shell and the other end extending and connected to the first cannula. The first cannula includes a first cannula proximal end and a first cannula distal end with a first cannula wall extending therebetween, and the second cannula includes a second cannula proximal end and a second cannula distal end with a second cannula wall extending therebetween. The second sleeve proximal end comprises a first external convex rib, a second external convex rib and a first external annular groove therebetween; the second sleeve proximal end further comprises a first outer notch that breaks the first outer rib from the second outer rib. The first sleeve proximal end comprises a first proximal end inner convex rib and a first distal end inner convex rib, and the shapes and the sizes of the first proximal end inner convex rib and the first distal end inner convex rib are matched with the first outer notch. The lower housing component comprises a shortest state, and when the lower housing component is in the shortest state, the first near-end inner convex rib and the first outer annular groove are mutually matched to form a first rotating buckle fit which can rotate around the axis of the sleeve and cannot axially move.

In one arrangement, the second sleeve is axially movable relative to the first sleeve when the first proximal internal bead or the first distal internal bead is aligned with the first external notch.

In yet another aspect, the cannula assembly further includes a longest position wherein the first distal inner rib and the first outer annular groove mate with each other to form a second rotational snap fit that is rotatable about the cannula axis and non-axially moveable.

In yet another aspect, a cannula assembly is provided comprising any of the lower housing assemblies described above, and further comprising an upper housing, an instrument seal and a zero seal sandwiched between the upper housing and the lower housing and in a compressed state, the upper housing and the lower housing assembly being connected to each other to form an integrated sealing system.

In one aspect of the invention, a rotatably telescoping lower housing assembly is provided that includes a lower housing, a first sleeve and a second sleeve. The lower shell comprises a far-end shell, one end of the transition shell is connected with the far-end shell, and the other end of the transition shell extends and is connected with the first sleeve; the first cannula includes a first cannula proximal end and a first cannula distal end with a first cannula wall extending therebetween, and the second cannula includes a second cannula proximal end and a second cannula distal end with a second cannula wall extending therebetween. The inner surface of the wall of the first sleeve comprises m (m is more than or equal to 3) inner convex ribs, the m inner convex ribs are uniformly distributed along the axial direction of the first sleeve, and two adjacent inner convex ribs define an inner annular groove; from the near end to the far end, the inner convex ribs are sequentially a first inner convex rib, a second inner convex rib … … and an m-th inner convex rib, and the inner annular grooves are sequentially a first inner annular groove, a second inner annular groove … … and an m-1-th inner annular groove. The outer surface of the second sleeve proximal end comprises a first outer convex rib and a first outer gap, and the first outer convex rib can be matched with the inner annular groove to form a rotary buckle fit which can rotate around the sleeve axis and cannot move axially.

In one scheme, the lower shell component comprises a rotating clamping state and an active state; in the rotating and clamping state, the first outer convex rib of the second sleeve is matched with any inner annular groove to form rotating buckle fit which can rotate around the axis of the sleeve and cannot move axially; in an active state, the inner convex rib is aligned with the first outer notch of the second sleeve, and the second sleeve can axially move relative to the first sleeve.

In yet another embodiment, the casing length of the lower housing component comprises m-1 length settings; when the first outer bead of the second sleeve is mated with the first inner annular groove, the sleeve length of the lower housing assembly is Lt1, referred to as the initial length; when the first outer convex rib of the second sleeve is matched with the second inner annular groove, the length of the sleeve of the lower shell component is Lt 2; and by analogy, when the first external convex rib of the second sleeve is matched with the m-1 th internal annular groove, the length of the sleeve of the lower shell component is Lt (m-1).

In still another embodiment, the length of the casing Lt (m-1) satisfies the following relationship:

Lt(m-1)＝Lt1+(m-1)*P2

wherein:

lt (m-1) -the length of the casing pipe when the first external convex rib is matched with the m-1 internal annular groove;

lt 1-the length of the sleeve when the first outer bead is mated with the first inner annular groove;

m is the number of the inner convex rib;

p2-spacing of two adjacent inner annular grooves.

In another aspect, the length L1 of the first sleeve satisfies the relationship:

3*Lt1/8≤L1≤Lt1/3，(m-1)*P2＜L1

wherein:

l1 — length of first sleeve;

m is the number of the inner convex rib;

p2-spacing of two adjacent inner annular grooves.

In one aspect of the invention, a trocar assembly 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 tube assembly 1;

FIG. 2 is a side projection view of the cannula assembly 1;

FIG. 3 is a cross-sectional view 2-2 of tube assembly 1;

FIG. 4 is a simulated view of the cannula assembly 1 secured to the abdominal wall;

FIG. 5 is a perspective view of the lower housing assembly 40 a;

fig. 6 is a perspective view of the lower housing 100;

FIG. 7 is a projection view of the first cannula 200 from the distal end to the proximal end;

FIG. 8 is a cross-sectional view of 8-8 of FIG. 7;

FIG. 9 is a proximal to distal projection view of the second cannula 300;

FIG. 10 is a cross-sectional view 10-10 of FIG. 9;

FIG. 11 is a cross-sectional view of the lower housing assembly 40 a;

FIG. 12 is a projection view of the first cannula 200a from the distal end to the proximal end;

FIG. 13 is a proximal to distal projection view of the second cannula 300 a;

FIG. 14 is a cross-sectional view of the lower housing assembly 40 b;

FIG. 15 is a projection view of the second cannula 300b from the proximal end to the distal end;

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

FIG. 17 is a projection view of the first cannula 200b from the distal end to the proximal end;

FIG. 18 is a cross-sectional view taken at 18-18 of FIG. 17;

FIG. 19 is a cross-sectional view of the lower housing assembly 40 c;

FIG. 20 is a projection view of the first cannula 200c from the distal end to the proximal end;

FIG. 21 is a cross-sectional view 21-21 of FIG. 21;

FIG. 22 is a cross-sectional view of the lower housing assembly 40 d;

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. 1-3 depict a cannula assembly 1 for laparoscopic surgery. The cannula assembly 1 includes an axis 2 and, arranged axially in series, an upper housing 30, an instrument seal 10, a zero seal 20 and a lower housing 40. Wherein the instrument seal 10 and the zero seal 20 are made of a super elastic material such as silicone rubber, etc. The upper and

lower housings

30 and 40 are made of a rigid thermoplastic plastic such as polycarbonate. The instrument seal 10 includes a sealing lip 11 defined by a sealing membrane 17 and a sealing membrane outer flange 19. The zero seal 20 comprises a zero seal flange 29 and a zero seal body 27 connected thereto and extending distally, a pair of seal sheets 21 connected to the zero seal body 27 and extending distally to form a "duck bill" shaped openable and closable duck bill valve. The upper housing 30 includes an open cannula assembly inlet 31 defined by a proximal housing 37 and an upper retaining ring 33 coupled to the upper housing 30 and extending distally. The lower housing 40 comprises a distal housing 47, a lower retaining ring 43 coupled to the distal housing 47 and extending proximally, and a transition housing 45 coupled to the distal housing 47 and extending distally to form a cannula 50, the cannula 50 comprising a cannula passage 53 defined by a cannula wall 51, the cannula wall 51 extending distally and forming a cannula lip 55, the cannula lip 55 defining an open cannula outlet 57. In this example, the instrument seal 10 and zero seal 20 are mounted between an upper housing 30 and a lower housing 40. Wherein the zero seal flange 29, the sealant membrane outer flange 19 are sandwiched between the lower retainer ring 43 and the upper retainer ring 33 in a compressed state, the upper housing 30 further comprises an attachment post 39 connected to the proximal housing 37 and extending distally, the lower housing 40 further comprises an attachment hole 49 matching the shape and location of the attachment post, the attachment post 39 and the attachment hole 49 are in an interference fit, thereby connecting the upper housing 30, the instrument seal 10, the zero seal 20 and the lower housing 40 as an integral sealing system. In this example, the upper housing and the lower housing are connected to form a whole through the fixing column and the fixing hole in an interference manner, but various manners such as threaded connection, rotary buckle connection, glue bonding and the like can be adopted.

Referring to fig. 3 and 4, when cannula assembly 1 is inserted into a body cavity from outside the body cavity, a pneumoperitoneum machine is usually used to continuously infuse gas (e.g., carbon dioxide gas) into the body cavity of a patient and maintain a constant gas pressure (about 13-15 mmHg) to obtain a sufficient surgical operation space for instruments to pass into and out of the body cavity. When no external instrument is inserted, the pair of sealing sheets 21 of the zero seal 20 is closed, and the zero seal 20 forms a zero seal assembly with the lower fixing ring 43, the transition housing 45 and the sleeve 50, so that gas in the body cavity is prevented from leaking out of the body through the sleeve assembly. When the external instrument is inserted, the external instrument opens the zero seal, gas in the body cavity can flow to the area between the zero seal and the sealing membrane through the zero seal, but the sealing lip 11 tightens the instrument, preventing gas from leaking through the sealing membrane. In this example, the sealing membrane and the zero seal are in direct contact and form a non-removable sealing system, however, the sealing membrane and the zero seal may not be in direct contact, and two separate and quick-release instrument seal assemblies and zero seal assemblies may be formed. For example, CN201610630336.5 entitled "a crimp-type piercer sealing system" discloses a structure comprising an instrument sealing assembly (first sealing assembly) and a zero sealing assembly (second sealing assembly). It will be appreciated by those skilled in the art that there are numerous implementations of the instrument seal and zero seal disclosed in the prior art, such as the four-lobed instrument seal assembly disclosed in US8029475, such as the pleated instrument seal assembly disclosed in US7789861, such as the instrument seal assembly comprising a woven cloth disclosed in US6482181, such as the four-lobed zero seal disclosed in US5443452, such as the duckbill zero seal disclosed in US8034032, and the like. Other disclosed instrument seals, zero seals and housings therefor may be used in place of the instrument seals, zero seals, upper housings, lower housings, etc. described herein with minor adaptations.

Referring now to fig. 4, when cannula assembly 1 is secured to the abdominal wall of a patient, cannula 50 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 sleeve 50 of the sleeve assembly 1 is fixed, which cannot meet the requirements of different scenes.

5-11 depict an improved lower housing assembly 40a including a lower housing 100, a first sleeve 200, and a second sleeve 300. Referring first to fig. 5-6, the lower housing 100 includes a distal housing 47 with a lower retaining ring 43 connected to the distal housing 47 and extending proximally; transition housing 45 is connected at one end to the distal housing and at its other end extends to form a cannula mount wall 46, cannula mount wall 46 extending proximally and being connected to cannula stop wall 44, cannula stop wall 44 defining lower housing throughbore 41.

Referring to fig. 7-8, the first cannula 200 includes a first cannula proximal end 210 and a first cannula distal end 230 with a first cannula wall 220 extending therebetween, an inner surface of the first cannula wall 220 including a first internal bead 250. The first inner rib 250 is formed by rotating a first inner rib section around the axis of the first sleeve. The first sleeve wall inner surface comprises a first inner cylindrical surface 229 with a diameter Dn1, the first inner rib 250 comprises a first inner rib cylindrical surface 259 with a diameter Dn2, and the first inner rib 250 has an angular distribution area A1 in the circumferential direction of the first sleeve 200. The inner ribs 250 comprise a proximal inner rib 251, a middle inner rib 253 and a distal inner rib 255; wherein the proximal inner ribs 251 and the intermediate inner ribs 253 define proximal inner grooves 252 having a spacing B1, and the intermediate inner ribs 253 and the distal inner ribs 255 define distal inner grooves 254 having a spacing B1. The first cannula distal end 230 includes a cylindrical tube 240.

The second cannula 300 includes a second cannula proximal end 310 and a second cannula distal end 330 and a second cannula wall 320 extending therebetween. The inner surface of the second sleeve wall defines a hollow tube. The outer surface of the second cannula proximal end 310 includes a first outer bead 340 having a thickness H, where H ≦ B1. The first external bead 340 is formed by rotating the first external bead section around the axis of the second sleeve. The second sleeve wall includes a first outer cylindrical surface 329 having a diameter Dw1, and the first outer rib 340 includes a first outer rib cylindrical surface 349 having a diameter Dw 2. The first external bead 340 includes a first external notch 350, which has an angular distribution area of ANG1 in the circumferential direction of the second casing 300.

Referring now to fig. 11, the first cannula proximal end 210 is coupled to the lower housing 100. In this example, the outer surface of the first cannula proximal end 210 matches the shape and size of the cannula mounting wall 46, and in one embodiment, glue is used to bond the first cannula proximal end 210 and the cannula mounting wall 46 together. Alternatively, the exterior of the proximal end 210 of the first cannula is secured as a unit by interference with the interior wall of the cannula retaining wall 44.

The second cannula proximal end 310 is mounted inside the first cannula 200. When the first external ribs 340 and the proximal internal grooves 252 are matched with each other to form a first rotary snap fit which can rotate around the cannula axis but cannot move axially, a first rotary snap state is called (fig. 11); when the first outer ribs 340 and the distal inner grooves 254 are matched with each other to form a second rotary snap fit which can rotate around the axis of the cannula and cannot move axially, a second rotary clamping state is called; when the first inner rib 250 is aligned with the first outer notch 350, the second sleeve is axially movable relative to the first sleeve, referred to as an active state. Preferably H is equal or approximately equal to B1 to reduce axial fit clearance. In one scheme, ANG1 is more than or equal to A1.

As shown in FIG. 11, the lower housing component 40a further includes a boot seal 500 mounted at the proximal end of the second boot, the boot seal 500 including a proximal elastomeric ring 510 having an inner diameter Dt1 and a distal elastomeric ring 530 having an inner diameter Dt 3. The seal 500 is mounted on the exterior of the cylindrical tube 240 with the proximal elastomeric ring 510 mating with the cylindrical tube 240 and the distal elastomeric ring 530 mating with the first outer cylindrical surface 329. In one embodiment, the proximal elastic ring 510 is fixed to the first outer cylindrical surface 329 by glue.

The sleeve seal 500 is made of a thermosetting elastomer or a thermoplastic elastomer. In one design, where Dt3 < Dw1, the distal elastomeric ring 530 of the cannula seal 500 is an interference fit with the first outer cylindrical surface 329. The far-end elastic ring 530 and the first outer cylindrical surface 329 have enough extrusion force to form a rotating peak force F1, the rotating outer force F2 applied on the first sleeve and the second sleeve does not generate relative rotational displacement when F2 is less than or equal to F1; when F2 > F1, the first sleeve and the second sleeve can be relatively rotationally displaced, so that the first rotational snap fit (the second rotational snap fit) is rotationally disengaged from each other, and the second sleeve can axially move relative to the first sleeve until the first inner rib 250 is aligned with the first outer notch 350, i.e., the second sleeve is in an active state. Reasonable interference is selected through an experimental method, and the material and the hardness of the sleeve sealing element 500 are reasonably selected, so that the rotating peak force F1 is controlled within a comfortable and safe range, wherein in a specific scheme, F1 is more than or equal to 10N and less than or equal to 20N. When F1 is less than 10N, the safety factor for preventing the first sleeve and the second sleeve from generating accidental relative rotation is not high enough; when F1 > 20N, the operation comfort of the rotation relative to the first sleeve and the second sleeve is not good enough.

It will be understood by those skilled in the art that when the lower housing assembly 40a is substituted for the lower housing 40 of the cannula assembly 1 to form a new cannula assembly 1a (not shown) for laparoscopic surgery, the surgeon may relatively rotate the first cannula and the second cannula according to the thickness of the abdominal wall of the patient, the position and puncture angle of the cannula assembly, the personal operation habit, etc., so as to change the cannula assembly from the first rotational snap-fit state to the active state and then to the second rotational snap-fit state, thereby changing the overall length of the cannula assembly. The depth of the cannula assembly into the abdominal wall is adjusted to achieve the desired placement of the cannula assembly outer section (length H1), body wall section (length H2) and body inner section (length H3).

12-14 depict an improved lower housing assembly 40b that includes a lower housing 100, a first sleeve 200a, a second sleeve 300a, and a sleeve seal 500. Referring initially to fig. 12 and 14, the first cannula 200a includes a first cannula proximal end 210 and a first cannula distal end 230 with a first cannula wall 220a extending therebetween. The first sleeve wall 220a includes internal ribs 260a (not shown) and internal notches 290a (not shown). The inner ribs 260a include a first set of inner ribs 261a and a second set of inner ribs 263 a. The first set of inner ribs 261a includes a first proximal inner rib 271, a first intermediate inner rib 273 and a first distal inner rib 275; wherein the proximal internal bead 271 and the intermediate internal bead 273 define first proximal internal grooves 272 having a spacing B1, and the intermediate internal bead 273 and the distal internal bead 275 define distal first end internal grooves 274 having a spacing B1. The second set of inner ribs 263a includes a second proximal inner rib 281, a second middle inner rib 283, and a second distal inner rib 285; wherein the proximal internal ribs 281 and the intermediate internal ribs 283 define second proximal internal grooves 282 having a spacing B1, and the intermediate internal ribs 283 and the distal internal ribs 285 define second distal internal grooves 284 having a spacing B1. Inner notch 290a includes a first inner notch 291a and a second inner notch 293 a.

The second cannula 300a includes a second cannula proximal end 310 and a second cannula distal end 330 and a second cannula wall 320a extending therebetween. Referring to fig. 13 and 14, the second cannula proximal end 310a includes an external bead 360a (not shown) and an external notch 390a (not shown). The outer ribs 360a include a first outer rib 361a and a second outer rib 363 a. The outer notch 390a includes a first outer notch 391a and a second outer notch 393 a. The second sleeve wall includes a first outer cylindrical surface 329 having a diameter Dw 1.

With continued reference to fig. 12-14, the proximal end of the second sleeve is mounted within the interior of the first sleeve, wherein the inner ribs are shaped and dimensioned to mate with the outer notches and the outer ribs are shaped and dimensioned to mate with the inner notches. Specifically, in this example, the first inner rib 261a matches with the first outer notch 391a in shape and size, the second inner rib 363a matches with the second outer notch 393a in shape and size, the first outer rib 361a matches with the first inner notch 291a in shape and size, and the second outer rib 363a matches with the second inner notch 293a in shape and size. When the inner ribs are aligned with the outer notches and the outer ribs are aligned with the inner notches, the second sleeve is axially movable relative to the first sleeve. I.e. the cannula assembly is in an active state.

With continued reference to fig. 12-14, the cannula assembly includes a shortest state in which the external ribs and the proximal internal grooves mate with each other to form a rotational snap fit that is rotatable about the cannula axis and not axially movable, referred to as a first rotational snap fit. Specifically, in this example, the first external ribs 361a mate with the first proximal internal grooves 272, while the second external ribs 363a mate with the second proximal internal grooves 282, forming a rotational snap fit that can rotate about the cannula axis and cannot move axially.

The sleeve assembly further comprises a longest state, and when the sleeve assembly is in the longest state, the outer convex ribs and the inner grooves in the far end are matched with each other to form a rotary buckle fit which can rotate around the axis of the sleeve and cannot move axially. Specifically, in this example, the first external rib 361a mates with the first distal internal groove 274, while the second external rib 363a mates with the second distal internal groove 282, forming a rotational snap fit that is rotatable about the cannula axis and non-axially moveable, referred to as a second rotational snap fit.

It should be readily understood by those skilled in the art that although the first outer bead and the second outer bead (or the first inner bead and the second inner bead) depicted in fig. 12-14 are substantially identical in shape and size, they may be different. Although the outer bead (inner bead) is depicted as being divided into two portions, three portions, or more, may be included. Regardless of the shape and size or number, at least the minimum, active and maximum positions of the cannula assembly are satisfied.

As shown in fig. 14, the lower housing component 40b is configured such that the ferrule seal 500 mates with the first and second ferrules of the ferrule assembly 40a in the same manner, and therefore will not be described in detail. Similarly, the pressing force between the distal elastic ring 530 and the first outer cylindrical surface 329 is enough to form a rotating peak force F1, the rotating external force F2 applied to the first sleeve and the second sleeve does not generate relative rotational displacement when F2 is less than or equal to F1; when F2 is greater than F1, the first sleeve and the second sleeve can generate relative rotational displacement, so that the first rotational snap fit (the second rotational snap fit) is rotationally separated from each other, and when the inner ribs are aligned with the outer notches, the second sleeve can axially move relative to the first sleeve, namely, the second sleeve is in an active state. Reasonable interference is selected through an experimental method, and the material and the hardness of the sleeve sealing element 500 are reasonably selected, so that the rotating peak force F1 is controlled within a comfortable and safe range, wherein in a specific scheme, F1 is more than or equal to 10N and less than or equal to 20N. When F1 is less than 10N, the safety factor for preventing the first sleeve and the second sleeve from generating accidental relative rotation is not high enough; when F1 > 20N, the operation comfort of the rotation relative to the first sleeve and the second sleeve is not good enough.

Fig. 15-19 depict an improved lower housing assembly 40c comprising a lower housing 100, a first sleeve 200b, a second sleeve 300b, and a sleeve seal 500. Referring initially to fig. 15 and 16, the second cannula 300b includes a second cannula proximal end 310b and a second cannula distal end 330 and a second cannula wall 320 extending therebetween. The second cannula proximal end 310b includes a first external bead 361b, a second external bead 362b, a third external bead 363b, and a fourth external bead 364 b. Wherein the first and second outer ribs define a first outer annular groove 371 and the third and fourth outer ribs define a second outer annular groove 372. The second sleeve 300b further comprises a first outer notch 391a and a second outer notch 393 a; the first outer notch and the second outer notch divide the first outer convex rib and the third outer convex rib; and the first outer notch and the second outer notch divide the second outer convex rib and the fourth outer convex rib.

As shown in fig. 17-18, the first cannula 200b includes a first cannula proximal end 210b and a first cannula distal end 230b with a first cannula wall 220 extending therebetween. The first cannula proximal end 210b includes a first proximal internal bead 261b and a second proximal internal bead 263 b; the first cannula distal end 230b includes a first distal inner rib 271b and a second distal inner rib 273 b.

Referring to fig. 19, the proximal end of the second sleeve is mounted inside the first sleeve, wherein the first proximal inner rib, the first distal inner rib are shaped and sized to match the first outer notch; the shape and the size of the second near-end inner convex rib and the second far-end inner convex rib are matched with the second outer gap. The lower shell component comprises a shortest state, when the lower shell component is in the shortest state, the first near-end inner convex rib and the first outer annular groove are matched with each other to form a first rotating buckle fit which can rotate around the axis of the sleeve and cannot move axially, and meanwhile, the second near-end inner convex rib and the second outer annular groove are matched with each other to form a rotating buckle fit which can rotate around the axis of the sleeve and cannot move axially.

When the first proximal inner rib or the first distal inner rib is aligned with the first outer notch, the second sleeve is axially movable relative to the first sleeve, and the lower housing assembly is in an active state. The lower housing component further comprises a longest state, when the lower housing component is in the longest state, the first far-end inner rib and the first outer annular groove are matched with each other to form a second rotating buckle fit which can rotate around the axis of the sleeve and cannot move axially, and meanwhile, the second far-end inner rib and the second outer annular groove are matched with each other to form a rotating buckle fit which can rotate around the axis of the sleeve and cannot move axially.

As shown in fig. 19, the ferrule seal 500 of the lower housing component 40c mates with the first and second ferrules of the ferrule assembly 40a in the same manner and therefore will not be described in detail. Similarly, the pressing force between the distal elastic ring 530 and the first outer cylindrical surface 329 is enough to form a rotating peak force F1, the rotating external force F2 applied to the first sleeve and the second sleeve does not generate relative rotational displacement when F2 is less than or equal to F1; when F2 is greater than F1, the first sleeve and the second sleeve can generate relative rotational displacement, so that the first rotational snap fit (the second rotational snap fit) is rotationally separated from each other, and when the inner ribs are aligned with the outer notches, the second sleeve can axially move relative to the first sleeve, namely, the second sleeve is in an active state. Reasonable interference is selected through an experimental method, and the material and the hardness of the sleeve sealing element 500 are reasonably selected, so that the rotating peak force F1 is controlled within a comfortable and safe range, wherein in a specific scheme, F1 is more than or equal to 10N and less than or equal to 20N. When F1 is less than 10N, the safety factor for preventing the first sleeve and the second sleeve from generating accidental relative rotation is not high enough; when F1 > 20N, the operation comfort of the rotation relative to the first sleeve and the second sleeve is not good enough.

FIGS. 20-21 depict yet another modified first cannula 200c, the first cannula 200c including a first cannula proximal end 210 and a first cannula distal end 230 and a first cannula wall 220 extending therebetween, an inner surface of the first cannula wall 220 including m (m ≧ 3) inner ribs 250c, the m first inner ribs 250c being uniformly distributed along an axial direction of the first cannula, adjacent two inner ribs 250c defining an inner annular groove 260 c. For convenience, from the proximal end to the distal end, the inner ribs are sequentially a first inner rib, a second inner rib … … and an m-th inner rib, and the inner annular groove is sequentially a first inner annular groove, a second inner annular groove … … and an m-1-th inner annular groove.

Referring to FIG. 22, yet another modified lower housing assembly 40d includes a lower housing 100, a first sleeve 200c and a second sleeve 300. The lower housing assembly 40d differs from the lower housing assembly 40a only by the first sleeve. More precisely, the first casing 200 in the lower housing assembly 40a is replaced with the first casing 200c, constituting a new lower housing assembly 40 d. The lower housing assembly 40d includes a rotatably engaged state and an active state. In the rotationally engaged state, the first outer rib of the second sleeve and any one of the inner annular grooves 260c are matched with each other to form a rotational snap fit which can rotate around the sleeve axis and cannot move axially. In the active state, the inner rib 250c is aligned with the first outer notch of the second sleeve, which is axially movable relative to the first sleeve.

As shown in fig. 22, the casing length of the lower casing component comprises m-1 length settings. When the first outer bead of the second sleeve is mated with the first inner annular groove, the sleeve length of the lower housing assembly is Lt1, referred to as the initial length; when the first outer convex rib of the second sleeve is matched with the second inner annular groove, the length of the sleeve of the lower shell component is Lt 2; and by analogy, when the first external convex rib of the second sleeve is matched with the m-1 th internal annular groove, the length of the sleeve of the lower shell component is Lt (m-1). The width of the inner annular groove 260c is P1, the distance between two adjacent inner annular grooves is P2, and the length Lt (m-1) of the sleeve satisfies the following relation:

Lt(m-1)＝Lt1+(m-1)*P2

it will be appreciated by those skilled in the art that when the lower housing assembly 40d is substituted for the lower housing 40 in the cannula assembly 1 to form a new cannula assembly 1d (not shown) for laparoscopic surgery, the surgeon may relatively rotate the first cannula and the second cannula to align the inner ribs 250c with the first outer notches of the second cannula to disengage the rotating snap, depending on the thickness of the abdominal wall of the patient, the position and puncture angle of the cannula assembly, and the personal handling habits; the second sleeve is moved to a proper position and then rotated to form a rotational snap-fit state, thereby changing the overall length of the sleeve assembly. The depth of the cannula assembly into the abdominal wall is adjusted to achieve the desired placement of the cannula assembly outer section (length H1), body wall section (length H2) and body inner section (length H3).

The length setting of first sleeve 200c has a greater impact on the ease of use of sleeve assembly 1d in the field, and in a preferred embodiment, length L1 of first sleeve 200c satisfies the relationship that length L1 of first sleeve 200c satisfies the relationship:

3*Lt1/8≤L1≤Lt1/3，(m-1)*P2＜L1

when L1 is greater than 3/8 of Lt1, the use of the cannula assembly in the shortest state is inconvenient, and the lengths of the body wall segment (length H2) and the body interior segment (length H3) are insufficient. When L1 is less than 1/3 of Lt1, L1 is too short and the adjustable elongation of the cannula assembly is not significant enough.

Those skilled in the art will readily appreciate that the cannula assembly also requires a mating needle. The needle penetration cannula assembly constitutes a trocar assembly which together then penetrates the abdominal wall of the patient through an incision previously provided therein into the body cavity, and the needle is removed leaving the cannula as a passage for instruments into and out of 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 lower shell assembly can be retracted to the initial position with the shortest length Lt0, the sleeve assembly is matched with the improved knife-free visual puncture needle to form the sleeve needle assembly for penetrating the abdominal wall, the puncture needle is taken away, then the first sleeve and the second sleeve are relatively rotated, and the fixed depth of the sleeve assembly on the abdominal wall is further adjusted, so that the external section (length H1), the body wall section (length H2) and the internal section (length H3) of the sleeve assembly achieve ideal arrangement. 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. 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. The utility model provides a rotatory scalable puncture ware thimble assembly of buckle formula, contains upper portion shell subassembly and lower part shell subassembly to and install the sealed and zero seal of apparatus between upper portion shell and lower part shell subassembly, its characterized in that:

1) the lower housing component including a first sleeve proximal end and a first sleeve distal end and a first sleeve wall extending therebetween, and a second sleeve including a second sleeve proximal end and a second sleeve distal end and a second sleeve wall extending therebetween;

2) the first sleeve proximal end is connected with the lower shell component, the second sleeve proximal end is mounted inside the first sleeve, and the first sleeve and the second sleeve comprise a first rotary clamping state, a second rotary clamping state and an active state;

3) under the first and second rotary clamping states, the second sleeve can rotate around the axis of the sleeve relative to the first sleeve but cannot move axially; in the active state, the second sleeve is axially movable relative to the first sleeve.

2. A block of bushings according to claim 1, characterized in that: the outer surface of the proximal end of the second sleeve comprises a first outer convex rib with the thickness of H and a first outer notch; the inner surface of the first sleeve wall comprises a first group of inner ribs, and the first group of inner ribs comprises a near-end inner groove and a far-end inner groove which are arranged at a distance of B1; wherein H is less than or equal to B1.

3. A block of bushings according to claim 2, characterized in that: the first external ribs and the proximal internal grooves are matched with each other to form a first rotary snap fit which can rotate around the axis of the sleeve and cannot move axially.

4. A block of bushings according to claim 2, characterized in that: the first external convex rib and the far-end internal groove are mutually matched to form a second rotary snap fit which can rotate around the axis of the sleeve and cannot axially move.

5. A block of bushings according to claim 2, characterized in that: the angle of a distribution area of the first group of inner ribs in the circumferential direction of the first sleeve is A1, the angle of a distribution area of the first outer notches in the circumferential direction of the second sleeve is ANG1, wherein ANG1 is more than or equal to A1; when the first group of inner ribs are aligned with the first outer notches, the second sleeve can axially move relative to the first sleeve.

6. The ferrule assembly of claim 2, further comprising a ferrule seal mounted to the first tube end.

7. A block of bushings according to claim 6, characterized in that: the cannula seal comprises a proximal elastomeric ring having an inner diameter Dt1 and a distal elastomeric ring having an inner diameter Dt 3; the far-end elastic ring is in interference fit with the first outer cylindrical surface.

8. A block of bushings according to claim 7, characterized in that: the sleeve sealing element is made of a thermosetting elastomer or a thermoplastic elastomer material, and a distal elastic ring of the sleeve sealing element is in interference fit with the first outer cylindrical surface to form a rotating peak force F1; a rotary external force F2 is exerted on the first sleeve and the second sleeve, and when F2 is less than or equal to F1, the first sleeve and the second sleeve do not generate relative rotary displacement; when F2 is larger than F1, the first sleeve and the second sleeve generate relative rotation displacement.