CN107049379B

CN107049379B - Sleeve assembly comprising automatic reset lock catch

Info

Publication number: CN107049379B
Application number: CN201710410234.7A
Authority: CN
Inventors: 谢万彬; 朱莫恕
Original assignee: 5r Med Technology Chengdu Co ltd
Current assignee: 5r Med Technology Chengdu Co ltd
Priority date: 2017-06-03
Filing date: 2017-06-03
Publication date: 2023-05-26
Anticipated expiration: 2037-06-03
Also published as: CN107049379A

Abstract

The invention relates to a sleeve component comprising an automatic resetting lock catch, which comprises an instrument seal, a zero seal, a first fixing piece, a second fixing piece, a top shell, a lower shell and a hollow sleeve connected with the lower shell; the zero seal is clamped between the lower shell and the second firmware and is mutually fixed to form a zero seal assembly; the zero seal assembly further comprises a lock member which is limited between the lower shell and the second firmware in a clearance fit manner, wherein the lock member comprises a button, a lock member frame and an elastic reset arm, and the button, the lock member frame and the elastic reset arm are connected to form a whole and a single part and are made of plastic materials; the unlocking external force is applied to drive the button, and the corresponding movement of the locking piece enables the first locking part, the second locking part and the third locking part to be unlocked, so that the instrument sealing assembly and the zero sealing assembly can be separated from each other; and removing the unlocking external force, and driving the locking piece to reset by the elastic reset arm.

Description

Sleeve assembly comprising automatic reset lock catch

Technical Field

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

Background

A puncture device is a surgical instrument used in minimally invasive surgery (especially hard endoscopic surgery) to create an artificial channel into a body cavity. The penetrator typically comprises a cannula assembly and a needle. The clinical general use mode is as follows: a small opening is firstly cut on the skin of a patient, then a puncture needle penetrates through the sleeve assembly, the distal end of the puncture needle exceeds the distal end of the sleeve assembly, and then the puncture needle penetrates through the body wall through the skin opening and enters the body cavity. The surgeon holds the puncture outfit and applies a large puncture operating force for overcoming the resistance to puncturing and cutting the tissue and the resistance to expanding and swelling the tissue. When the distal end of the needle and cannula assembly is entirely penetrating the patient's body wall, the resistance suddenly disappears, and the physician may not be able to stop the application of force or the distal end of the needle may accidentally damage the patient's internal tissue due to inertia. To reduce this risk of accidental trauma, numerous designers have made numerous innovative designs that create three broad categories of knife-protected lancets, knife-free lancets, and visible lancets. Various puncture needles have advantages and disadvantages, and surgeons often comprehensively consider and formulate a reasonable method for establishing a puncture channel and select the puncture needle matched with the puncture channel according to the type of the operation, the operation position and the condition of a patient.

In hard endoscopic surgery, a stable pneumoperitoneum is often created and maintained to obtain sufficient surgical space. The cannula assembly is typically comprised of a cannula, a housing, a sealing membrane (also known as an instrument seal) and a zero seal (also known as an auto seal). The cannula penetrates from outside the body cavity into the body cavity as a passageway for instruments to enter and exit the body cavity. The zero seal typically does not provide a seal to 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 when the instrument is inserted.

In the disclosed prior art sleeve assemblies, the instrument seal is typically coupled to the housing to form a first seal assembly, the zero seal is coupled to the sleeve to form a second seal assembly, and the first and second seal assemblies are coupled by a quick lock mechanism. The quick locking mechanism is convenient to assemble the first sealing component and the second sealing component together and automatically lock, and meanwhile, the quick locking mechanism can be released by one hand so as to split the first sealing component and the second sealing component. This design is typically intended to facilitate the removal of tissue from a patient during surgery. For example, after a tissue sample is obtained from a patient using an instrument during surgery, the first seal assembly is removed by releasing the quick-lock mechanism, and the sample is removed from the body with only a zero seal, without having to seal with the instrument. This makes it easier to remove the sample and less damaging to the sample.

The quick locking mechanism is realized in a plurality of modes: a spring-actuated rotary latch member to achieve a quick lock connection is disclosed in chinese patent application 200410092127.8 (entitled "rotary latch system for trocars") filed on 9/30 2004. In chinese invention application 201410072509.7 (entitled "improved puncture outfit") filed on 1/3/2014, the first and second sealing assemblies of the prior art are not tightly connected, resulting in leakage; and a scheme for realizing quick lock connection by the spring-driven horizontally-moving lock plug body is provided. Chinese invention application 201410335388.0 (entitled "minimally invasive puncture device") filed on 7/15 2014 discloses a spring-driven bi-directional releasable rotary locking member for quick-lock connection. There are many improvements disclosed for the quick lock connection between the first and second seal assemblies that are not described in detail for economy. While the search for simpler, more reliable, faster to operate quick lock mechanisms continues.

Disclosure of Invention

To solve one or more of the problems of the prior art, it is an object of the present invention to provide a cannula assembly including an automatic reset lockout including an instrument seal, a zero seal, a first fastener, a second fastener, a top housing, a lower housing, and a hollow cannula connected thereto; the instrument seal is clamped between the top shell and the first fixing piece and mutually fixed to form an instrument seal assembly, and the zero seal is clamped between the lower shell and the second fixing piece and mutually fixed to form a zero seal assembly; wherein: the zero seal assembly further includes a lock that is limited in a clearance fit between the lower housing and a second retainer, the lock moving in a transverse plane that is generally perpendicular to the hollow sleeve axis; the lock piece comprises a button, a lock piece frame and an elastic reset arm, wherein the button, the lock piece frame and the elastic reset arm are connected to form a whole and are made of plastic materials; the first fixing piece and the locking piece are matched with each other to form a first locking part, a second locking part and a third locking part, and the first locking part, the second locking part and the third locking part are matched with each other to fix the instrument sealing assembly and the zero sealing assembly together; the unlocking external force is applied to drive the button, and the corresponding movement of the locking piece enables the first locking part, the second locking part and the third locking part to be unlocked, so that the instrument sealing assembly and the zero sealing assembly can be separated from each other; and removing the unlocking external force, and driving the locking piece to reset by the elastic reset arm.

Preferably, the lock further comprises a transverse shaft passing through the button and being substantially perpendicular to the axial direction of the sleeve assembly; the locking piece comprises a first locking hook, a second locking hook and a third locking hook, wherein the first locking hook and the second locking hook are arranged at the near-end position of the locking piece frame along the transverse axis direction and are rigidly connected with the locking piece frame into a whole, and the third locking hook is arranged at the far-end position of the locking piece frame along the transverse axis direction and is connected with the locking piece frame into a whole through a flexible arm; the first firmware comprises a first lock catch, a second lock catch and a third lock catch, the first lock catch and the first lock hook are matched to form the first locking part, the second lock catch and the second lock hook are matched to form the second locking part, and the third lock catch and the third lock hook are matched to form the third locking part; and the unlocking external force is applied to drive the button to transversely move towards the direction in the sleeve assembly, the first lock hook and the second lock hook move in the same direction as the button to unlock, and the flexible arm elastically deforms and drives the third lock hook to move in the opposite direction to the button to unlock.

Preferably, the first firmware comprises a first lip, the second firmware comprises a second lip, and the first lip and the second lip are matched with each other to form a lip fit; the lip engagement primarily limits lateral movement of the instrument seal assembly and the zero seal assembly, while the first, second, and third locking portions primarily limit axial movement of the instrument seal assembly and the zero seal assembly.

Preferably, the first fastener comprises a lower annular wall in contact with the zero seal and forming an airtight seal at the contact location.

Preferably, the latch frame includes a first latch member, a second latch member and a third latch member; each latch member includes a proximally-facing angled cam surface and an opposite latch surface; the first firmware comprises a first lower extension arm, a second lower extension arm and a third lower extension arm, wherein the first lower extension arm, the second lower extension arm and the third lower extension arm are arranged corresponding to the lock piece; each lower extension arm includes a cam surface and a latch surface; the first, second and third latch members are distributed to cooperate with the first, second and third lower extension arms to form the first, second and third latch portions.

Preferably, the lock further comprises a transverse shaft passing through the button and being substantially perpendicular to the axial direction of the sleeve assembly; the lock piece frame is formed by a closed annular structure; the first locking component is arranged at the far end position of the locking piece frame along the transverse axis direction, and the second locking component and the third locking component are arranged at two sides of the near end position of the locking piece frame along the transverse axis direction; and the first, second and third locking parts move in the same direction with the button to unlock, the unlocking external force is removed, and the elastic reset arm drives the locking piece to reset.

Preferably, the lock further comprises a transverse shaft passing through the button and being substantially perpendicular to the axial direction of the sleeve assembly; the lock piece frame is formed into a non-closed fork-shaped structure by a first locking arm and a second locking arm which are arranged on two sides of the button, the first locking arm comprises a first cam part and a first elastic arm part, and the second locking arm comprises a second cam part and a second elastic arm part; the first locking component is arranged at the near end position of the locking piece along the transverse axis direction, the second locking component is arranged at the far end of the first locking arm, and the third locking component is arranged at the far end of the second locking arm; applying unlocking external force to drive the button to move towards the inside of the sleeve assembly along the transverse shaft, wherein the first locking component and the button move in the same direction to unlock; the first cam part and the second cam part are mutually pressed with the lower shell or the second firmware to force the first elastic arm part and the second elastic arm part to elastically deform, so that the first locking arm and the second locking arm do integral offset movement to unlock the second locking component and the third locking component; and removing the unlocking external force, and driving the locking piece to reset by the elastic reset arm.

Drawings

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

FIG. 1 is a perspective view of a first embodiment of the puncture instrument according to the present invention;

FIG. 2 is an exploded view of the cannula assembly and the needle of the penetrator of FIG. 1;

FIG. 3 is a partial cross-sectional view of the sleeve assembly of FIG. 1;

FIG. 4 is an exploded view of the zero seal assembly of the sleeve assembly of FIG. 3;

FIG. 5 is a perspective view of the lock of the zero seal assembly shown in FIG. 4;

FIG. 6 is a schematic view of the lock assembly of the zero seal assembly of FIG. 4;

FIG. 7 is a schematic illustration of the assembled zero seal assembly of FIG. 4;

FIG. 8 is a schematic view of an instrument seal assembly of the cannula assembly of FIG. 3;

FIG. 9 is a partial cross-sectional view of the shackle and shackle mating portion of the sleeve assembly;

FIG. 10 is a schematic illustration of a latch in an initial state;

FIG. 11 is a schematic illustration of a latch in an unlocked state;

FIG. 12 is a schematic view of a zero seal assembly of another embodiment;

FIG. 13 is a schematic view of another embodiment instrument seal assembly;

FIG. 14 is a partial cross-sectional view of a sleeve assembly of another embodiment;

FIG. 15 is a partial cross-sectional view of a sleeve assembly of yet another embodiment;

FIG. 16 is a schematic view of an instrument seal assembly of the cannula assembly of FIG. 15;

FIG. 17 is an exploded view of the zero seal assembly of the sleeve assembly of FIG. 15;

FIG. 18 is a perspective view of the lock of the zero seal assembly of FIG. 17;

FIG. 19 is a reverse perspective view of the lock of FIG. 18;

FIG. 20 is a schematic view of the lock assembly of the zero seal assembly of FIG. 17;

FIG. 21 is a schematic view of the assembled zero seal assembly of FIG. 17;

FIG. 22 is a partial cross-sectional view of the shackle and shackle mating portion of the sleeve assembly of FIG. 15 in an unlocked state;

FIG. 23 is a partial cross-sectional view of the shackle and shackle mating portion of the sleeve assembly shown in FIG. 15;

FIG. 24 is an exploded view of a zero seal assembly of another embodiment;

FIG. 25 is a perspective view of the lock of the zero seal assembly of FIG. 24;

FIG. 26 is a reverse perspective view of the latch of FIG. 25;

FIG. 27 is a schematic view of the lock assembly of the zero seal assembly of FIG. 24;

FIG. 28 is an enlarged partial schematic view of FIG. 27;

FIG. 29 is a schematic view of the zero seal assembly of FIG. 27 in an unlocked condition;

FIG. 30 is an enlarged partial schematic view of FIG. 29;

FIG. 31 is a schematic view of a right hand grip of a prior art penetrator in clinical use;

FIG. 32 is a schematic view of a left hand grip during clinical use of a prior art penetrator;

FIG. 33 is a front projection view of the penetrator 1000;

FIG. 34 is a left side projection view of the penetrator 1000;

FIG. 35 is a proximal-to-distal projection of the penetrator 1000;

FIG. 36 is a schematic view of a right hand grip of the present invention in clinical application;

FIG. 37 is a schematic view of a left hand grip of the present invention in clinical use;

throughout the drawings, like reference numerals designate identical 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 may 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 invention.

Referring to fig. 1-2, for convenience of description, the party closer to the operator is defined as the proximal end, and the party farther from the operator is defined as the distal end. The central axis defining the sleeve assembly 200 is referred to as the longitudinal axis 10, the direction generally parallel to the longitudinal axis 10 is referred to as the axial direction, the axis defining the button through the sleeve assembly 200 and generally perpendicular to the longitudinal axis 10 is referred to as the transverse axis 20, and the direction generally parallel to the transverse axis 20 is referred to as the transverse direction.

Fig. 1-9 depict the overall structure and assembly of a first embodiment of the puncture instrument of the present invention. Fig. 1-3 depict the overall structure of the penetrator 1000. A typical penetrator 1000 includes a needle 100 and a cannula assembly 200. Cannula assembly 200 includes instrument seal assembly 300 and zero seal assembly 400. The instrument seal assembly 300 includes a first fixture 310, a top cover 370 and a sealing membrane assembly 320 sandwiched therebetween. The seal assembly 400 includes a body 410, a lock 430, a zero seal 450, a second firmware 470, and a valve assembly 490. It will be appreciated by those skilled in the art that it is important that the instrument seal assembly 300 and the zero seal assembly 400 remain securely connected and reliably sealed during insertion of the cannula assembly 200 into the abdominal wall, as well as during normal operation. However, it may be more convenient for the surgeon to remove the instrument seal assembly 300 when taking a sample, such as when taking sample tissue from the abdominal cavity, so that the sample tissue passes through the zero seal 450 only, rather than simultaneously passing through the zero seal 450 and the seal membrane assembly 320. The mode can be used for taking out the sample more easily in the taking-out process, and meanwhile, the condition that the sample tissue is damaged due to extrusion is reduced.

The structure and composition of the instrument seal assembly 300 is depicted in greater detail in fig. 3 and 8. The first fastener 310 includes a planar wall portion 311 and a central hole 313 therethrough. The first fastener 310 further includes a proximally extending upper annular wall 314 and an upper housing 315 connected to the wall portion 311, and a distally extending lower annular wall 316 and a first lip 317, the upper housing 315 and the first lip 317 being connected and smoothly transitioning. The top cover 370 comprises a top housing 371 and a through hole 373 therethrough, the top cover 370 further comprising a proximal flat 372 and an inner annular wall 374 extending distally from the interior of the top housing 371. The seal stack film assembly 320 includes a seal film 330 and a protective sheet 340, wherein the protective sheet 340 may be secured to the seal film 330 by adhesive or other mechanical means, in this example, the protective sheet 340 is embedded onto the seal film 330. The sealing membrane 330 includes sealing membrane proximal 334 and distal sealing aperture 338 and a sealing wall extending therebetween. The seal membrane proximal end 334 is secured between the upper annular wall 314 and the inner annular wall 374. The first fixing member 310 and the top cover 370 may be fixed in various manners, such as interference fit, ultrasonic welding, gluing, fastening, etc. The connection mode is shown in this embodiment, the top case 371 and the upper case 315 are fixed by ultrasonic welding. This fixation places the proximal end 334 of the sealing membrane assembly 320 in compression. The central bore 313, the distal seal bore 338 and the through bore 373 are substantially aligned to form a passageway for the ingress and egress of instruments.

The structure and composition of the zero seal assembly 400 is depicted in greater detail in fig. 3 and 4. The body 410 includes an elongated tube 412, the elongated tube 412 including an open distal end 419 and a hollow cannula 413 coupled to the body housing 411 extending through the distal end 419. The distal end 419 is defined by the cannula lip 414. The body 410 also includes an inner wall 426 supporting a zero seal and a valve mounting hole 427 in communication with the inner wall. The valve element 496 is mounted in the valve body 492 to form a valve assembly 490 and is mounted together in the mounting bore 427.

Referring to fig. 5, the lock 430 includes a lock frame 432, the frame 432 including a frame proximal face 433 and a frame distal face 434 (not shown), the lock frame 432 defining a central throughbore 431. In this example, the latch frame 432 is a planar, approximately annular, closed structure, however, one of ordinary skill will recognize that the latch frame may be comprised of other shaped ribs, beams or walls, or may be a non-closed structure. The lock 430 further includes a first return arm 437, a second return arm 438 and a button 436 integrally connected to the frame 432. The lock 430 further includes a first rigid latch hook 442 extending proximally, a second rigid latch hook 444, and a third rigid latch hook 446, wherein the first latch hook 442 and the second latch hook 444 are disposed at a proximal location along the transverse axis 20 of the lock frame 432 and are directly coupled to the frame 432, the coupling being rigid; and the third latch hook 446 is disposed at a distal end of the latch frame 432 in the direction of the transverse axis 20 and is indirectly connected to the frame 432 by a first flexible arm 447 and a second flexible arm 448, which are flexible. The first, second, and third latch hooks 442 (444, 446) each include a lead-in slope, a locking plane, and a cantilever, the lead-in slopes of the first, second, and third latch hooks 442 (444, 446) each being longitudinally downward, the locking planes of the first and second latch hooks being oriented in a proximal direction along the transverse axis 20, and the locking plane of the third latch hook 446 being oriented in a distal direction along the transverse axis 20.

Referring to fig. 4 and 7, the second fixture 470 includes a planar wall portion 471 and a central bore 473 therethrough, and further includes a housing wall 472 coupled to the wall portion 471, a proximally extending second lip 474 and a distally extending mounting post 478. In this example, the second lip 474 includes a cylindrical lip 474a and a flat lip 474b. The second fastener 470 further includes a clearance through hole 475 through the wall portion 471 and a clearance through hole 476 through the second lip 474, the clearance through hole 475 and clearance through hole 476 being sized and positioned to accommodate the first, second, and third shackle of the locking member 430.

With continued reference to fig. 4-7, the body 410 further includes a plurality of stop bars 422, a plurality of stop posts 423, a plurality of hollow fixed posts 428, and a button mounting location 424. The zero seal 450 includes a flange portion 456, a zero seal wall 454 extending proximally from the flange, and a distally extending duckbill 453. Referring now to FIG. 6, the zero seal 450 is mounted onto the body 410 with the flange portion 456 in contact with the inner wall 426. With continued reference to fig. 6, the locking member 430 is mounted to the body 410 with the distal face 434 of the locking member 430 mated with the stop bead 422; the button 436 mates with the button mount 424; the first reset arm 437 and the second reset arm 438 are in contact with the outside of the hollow stationary post 428 and in an initial compressed state; the first flexible arm 447 and the second flexible arm 448 are in contact with the limiter post 423 and are in an initial compressed state. Referring now primarily to fig. 4 and 7, the second firmware 470 is secured with the body 410. The second fixing member 470 and the main body 410 may be fixed in various manners, such as interference fit, ultrasonic welding, adhesive bonding, and fastening. In this embodiment 4 mounting posts 478 have an interference fit with 4 hollow fixing posts 428. The flange portion 456 of the zero seal 450 is sandwiched between the inner wall 426 and the second fastener 470 and the flange 456 is in a compressed state. The locking member 430 is sandwiched between the spacing rib 422 and the second securing member 470 in a clearance fit state, wherein the first, second and third locking hooks 442, 444 and 446 pass through the clearance through-

holes

475 and 476 and protrude beyond the second lip 474, and the button 436 protrudes beyond the main body housing 411.

Referring to fig. 8, the first firmware 310 further includes a first buckle 319a, a second buckle 319b, and a third buckle 319c that are matched with the first, second, and third locking hooks of the locking member 430. The first lip 317 includes a cylindrical lip 317a and a flat lip 317b that match the shape and size of the second lip 474. Referring now to fig. 9, the instrument seal assembly 300 and the zero seal assembly 400 are coupled together to form the cannula assembly 200, wherein the first latch hook 442 and the first clasp 319a mate to form a first locking feature, the second latch hook 444 and the second clasp 319b mate to form a second locking feature, and the third latch hook 446 and the third clasp 319c mate to form a third locking feature. And the annular wall 316 contacts and forces the zero seal wall 454 in a compressed state such that the connection area between the instrument channel defined by the instrument seal assembly 300 and the instrument channel defined by the zero seal assembly 400 forms an airtight seal. In one aspect, the first lip 317 and the second lip 474 mate with each other to form a lip fit; the lip engagement primarily limits lateral movement of the instrument seal assembly and the zero seal assembly, while the first, second, and third locking portions primarily limit axial movement of the instrument seal assembly and the zero seal assembly. Those skilled in the art will recognize that other limiting means may be employed to achieve similar functionality.

Fig. 10 depicts a morphology of lock 430 in an initial state or locked state. Fig. 11 depicts a morphology of lock 430 in a compressed or unlocked state. The locking action process is as follows: when the instrument seal assembly 300 is snapped down toward the zero seal assembly 400, the first catch 319a presses axially downward against the lead-in chamfer 443a of the first shackle 442 to create a force component F that is laterally upward (as viewed from the perspective of FIG. 11) ₁ While the second latch 319b presses the lead-in slope 445a of the second latch hook 444 axially downward to generate a laterally upward force component F ₂ The component force F ₁ And component force F ₂ The entire lock frame 432 is driven laterally upward until the first and

second shackle

442, 444 are concealed within the second lip 474. The lock frame 432 is moved laterally upward as a whole so that the first and second return

arms

437 and 438 continue to compress and undergo a large elastic deformation; and the overall lateral upward movement of the latch frame 432 reduces the spacing between the post 423 and the latch frame 432, compressing the first and second

flexible arms

447, 448 to displace the third latch hook 446 laterally downward (as viewed in the perspective of fig. 11) until the third latch hook 446 is concealed within the second lip 474. After the first, second and

third catches

319a, 319b, 319c are fully extended axially downward beyond the leading-in inclined surfaces of the first, second and third shackle, the force component F ₁ And F ₂ The first, second and second return

arms

437, 438, 447, 448 snap back to return such that the locking plane 442b of the first latch hook 442 engages the first catch 319a, the locking plane 444b of the second latch hook 444 engages the second catch 319b, and the locking plane 446b of the third latch hook 446 engages the third catch 319 c. Thereby securing the instrument seal assembly 300 and the zero seal assembly 400 together (as shown in fig. 9).

The unlocking action process is as follows: with continued reference to fig. 9-11, when an unlocking force F is applied to the button 436 laterally upward (as viewed from the perspective of fig. 11) ₃ The lock frame 432 is driven to move laterally upward as a whole until the first and

second shackle

442, 444 are concealed inside the second lip 474. The lock frame 432 is moved laterally upward as a whole so that the first and second return

arms

flexible arms

447, 448 to displace the third latch hook 446 laterally downward until the third latch hook 446 is concealed within the second lip 474. At this time, the first locking buckle 319a and the second locking buckle The connection of one latch hook 442 is disconnected, the connection of the second latch 319b and the second latch hook 444 is disconnected, and the connection of the third latch 319c and the third latch hook 446 is disconnected. So that the instrument seal assembly 300 can be separated from the zero seal assembly 400. Removing the unlocking force F ₃ The first 437, second 438, first 447 and second 448 flexible arms spring back rapidly to drive the latch 430 back.

In the prior art disclosed at present, a large number of locking parts or quick locking mechanisms for realizing quick connection and disconnection between an instrument sealing assembly and a zero sealing assembly are provided, wherein the quick locking mechanism mainly composed of movable locking parts (movable locking part mechanism for short) is convenient to disassemble and reassemble, and has wide application. Typical application cases include: rotary latching systems such as disclosed in US 8029475; bidirectionally unlockable rotary latch members such as disclosed in chinese patent No. 201410335388.0; double-return font locking schemes such as those disclosed in chinese invention 201310202250.9; such as the horizontally moving lock insert solution disclosed in chinese patent No. 201410072509.7, etc. The quick locking mechanism is convenient to disassemble and reassemble as much as possible and has small force for disassembly and reassembly on the premise of ensuring reliable connection so as to obtain better operation experience, and meanwhile, the production and manufacture of the quick locking mechanism are as simple as possible so as to save cost. The movable locking mechanisms disclosed so far generally have the common feature that they are mainly constituted by a spring-driven translational or rotational locking member, which usually comprises only two locking portions. It will be appreciated by those skilled in the art that the springs are limited to the structural features of the sleeve assembly itself, which typically need to be of a slim size, and even if they are of a slim construction, they typically require a relatively large installation space, resulting in significant limitations in the design and installation of other components (e.g., zero seals, movable locks or valve assemblies, etc.). Often a tiny spring complicates the assembly of the sleeve assembly and makes robotic automated assembly difficult. In addition, based on the related mechanical principle, the two limiting points can only limit translational movement but not rotational movement taking the two limiting points as axes, that is, the structure of the two locking portions is usually unstable, and the two locking portions must be compensated by increasing the locking contact area and increasing the locking force, so that the operation experience of disassembly or reassembly is poor.

It will be appreciated by those skilled in the art that the lock of the present invention comprises a single piece of plastic material with which the lock frame is integrally connected and the resilient return arm is formed, and that no additional spring drive is required, thereby saving installation space and simplifying assembly operations. At the same time, the lock and other parts can be designed more complex, since there is no need to leave a spring installation space. In this embodiment, the first fastener 310 and the locking member 430 cooperate to form a first locking portion, a second locking portion, and a third locking portion, the first, second, and third locking portions cooperating to secure the instrument seal assembly and the zero seal assembly together. The device has the advantages that the connection between the instrument sealing assembly and the zero sealing assembly is firmer and smoother, the locking force of the connection can be reduced, and the operation experience of disassembly or reassembly is better. The locking piece can be integrally formed in an injection molding mode, elastic parts such as springs are not required to be additionally arranged, and the number of parts and assembly procedures are effectively reduced. The injection molding plastic material includes, but is not limited to, polyamide (PA), polyamide+glass fiber, polycarbonate (PC), polymethyl methacrylate (PMMA), polypropylene (PP), cyclic Olefin Copolymer (COC), acrylonitrile-butadiene-styrene copolymer (ABS), etc.

Fig. 12-14 depict another implementation, the cannula assembly 200a includes an instrument seal assembly 300a and a zero seal assembly 400a. The sleeve assembly 200a is substantially identical in construction and composition to the sleeve assembly 200, with the primary difference being the manner in which the interface between the instrument channel defined by the instrument seal assembly and the instrument channel defined by the zero seal assembly forms an airtight seal. In this embodiment, the zero seal assembly 400a includes an upper annular lip 478a extending proximally, the upper annular lip 478a including a seal ring securing slot 478b and further including a positioning aperture 478c; the instrument seal assembly 300a includes a lower annular lip 318a and a locating post 318c. Referring now to fig. 14, the instrument seal assembly 300a and the zero seal assembly 400a are coupled together, the locating post 318c mates with the locating hole 478c, and the sealing ring 460a fits within the securing slot 478b between the upper annular lip 478a and the lower annular lip 318a such that the interface between the instrument channel defined by the instrument seal assembly 300a and the instrument channel defined by the zero seal assembly 400a forms an airtight seal.

Fig. 15-20 depict a sleeve assembly 500 according to a second embodiment of the present invention. The sleeve assembly 500 includes an instrument seal assembly 600 and a zero seal assembly 700.

The structure and composition of the instrument seal assembly 600 is depicted in fig. 15 and 16. The instrument seal assembly 600 includes a first fastener 610, a top cover 370 and a sealing membrane assembly 320 sandwiched therebetween. The first fastener 610 includes a planar wall portion 612 and a central bore 618 therethrough. The wall portion 612 includes a proximal face 611 and a distal face 613, and the upper annular wall 314 is integral with the wall portion 612 and extends proximally. The first fastener 610 also includes an upper housing 315, the upper housing 315 being integral with and smoothly transitioning with the wall portion 612. The seal membrane proximal end 334 is secured between the upper annular wall 314 and the inner annular wall 374. The top case 371 is secured to the upper housing 315 by ultrasonic welding. This fixation places the proximal end 334 of the sealing membrane assembly 320 in compression. The central bore 618, the distal seal bore 338 and the through bore 373 are substantially aligned to form a passageway for the ingress and egress of instruments. The first fastener 610 further includes a first lower extension arm 684, a second lower extension arm 683, and a third lower extension arm 682. Each lower extension arm 684 (683, 682) includes a downwardly facing cam surface 684a (683 a,682 a) and a latch surface 684b (683 b,682 b), and the first, second, and third lower extension arms 684 (683, 682) are disposed in a triangular approximately uniform arrangement over the distal face 613 of the first firmware 610.

The structure and composition of the zero seal assembly 700 is depicted in fig. 15 and 17. The seal assembly 700 includes a body 710, a lock 760, a zero seal 450, a second firmware 770, and a valve assembly 490. The body 710 includes an elongated tube 412, the elongated tube 412 including an open distal end 419 and a hollow cannula 413 coupled to the body housing 411 extending through the distal end 419. The body 410 also includes an inner wall 426 supporting a zero seal and a valve mounting hole 427 in communication with the inner wall. The valve element 496 is mounted in the valve body 492 to form a valve assembly 490 and is mounted together in the mounting bore 427.

Referring to fig. 18-19, the lock 760 includes a lock frame 761 and a button 769 coupled thereto, the lock frame 761 defining a central throughbore 768. The latch frame 761 includes a first latching member 764, a second latching member 763 and a third latching member 762. The first, second, third latching members 764 (763, 762) mate with the first, second, and third lower extension arms 684 (683, 682), respectively, of the instrument seal cartridge 600. The first, second and third latching members 764 (763, 762) are triangularly arranged in correspondence with the first, second and third lower extension arms 684 (683, 682). The lock 760 also includes a transverse shaft 20a passing through the button 769 and generally perpendicular to the axial direction of the sleeve assembly 500. More precisely, the first locking member 764 is disposed at a distal end position of the lock frame 761 along the transverse axis 20a, and the second, third locking members (763, 762) are disposed at both sides of the proximal end position of the lock frame 761 along the transverse axis 20a. The first, second and third latching members 764 (763, 762) each include a proximally facing cam surface 764a (763 a,762 a); likewise, the first, second and third latch members 764 (763, 762) include distally facing latch surfaces 764b (763 b,762 b) that are shaped and dimensioned to mate with the latch surfaces 684b (683 b,682 b) of the first, second and third lower extension arms 684 (683, 682). The lock 760 also includes a reset arm 766 integral with the lock frame 761. The return arm 766 includes a resilient cantilever 766a and a resilient tip 766b, the resilient cantilever 766a being an elongated arm with good resilient capabilities. In one implementation, the resilient tip 766b includes a blunt or spherical surface to facilitate sliding back and forth along an axial fit on the outer surface of the inner wall 426. The lock frame 761 also includes a guide slot 765, the guide slot 765 including a guide slot proximal end 765a and a guide slot distal end 765b.

Referring to fig. 17, the second retainer 770 includes a planar wall portion 771 and a central bore 773 therethrough, and further includes a housing wall 772 coupled to the wall portion 771 and a distally extending mounting post 778. The second firmware 770 further includes a clearance through hole 775 extending through the wall portion 771, the clearance through hole 775 being sized and positioned to accommodate the first, second and third lower extension arms 684 (683, 682).

Referring to fig. 15, 17, 20 and 21, the main body 710 further includes a plurality of hollow fixing posts 721, a plurality of limit ribs 722,2 positioning posts 723 and a button mounting position 724. Referring now to FIG. 15, the zero seal 450 is mounted onto the body 710 with the flange portion 456 in contact with the inner wall 426. Referring now to fig. 19-20, the lock 760 is mounted to the body 710 with the lock frame 761 sandwiched between the stop bar 722 and the wall portion 771; the button 769 mates with the button mount 724; the positioning column 723 is matched with the guide groove 765; the return arm 766 is in contact with the inner wall 426 and is in a pre-compressed state. Referring now to fig. 20, an interference fit of 4 mounting posts 778 with 4 hollow fixing posts 721 secures the second firmware 770 with the body 710. The flange portion 456 of the zero seal 450 is sandwiched between the inner wall 426 and the second retainer 770 and the flange 456 is in a compressed state. The lock 760 is sandwiched between the stop bar 722 and the second fastener 770 and is in a clearance fit.

The locking action process is as follows: referring to fig. 20 and 22, when the instrument seal assembly 600 is axially snapped down toward the zero seal assembly 700, first the cam surfaces 684a (683 a,682 a) press against the cam surfaces 764a (763 a,762 a) to generate a force component F that is directed laterally upward (as viewed from the perspective of fig. 20) ₅ The component force F ₅ Continuing to compress the return arm 766 laterally upward to a greater elastic deformation and driving the lock frame 761 laterally upward until the cam surfaces 684a (683 a,682 a) clear the cam surfaces 764a (763 a,762 a) and disengage from one another, whereupon the separation F ₅ And vanishes. The engagement of the guide slot 765 with the detent 723 allows the lock frame to move either laterally upward or laterally downward without rotation. Referring now to FIG. 23, when the separation F ₅ After disappearing, the return arm 766 is elastically restored to drive the lock frame 761 to move laterally downward until theLatch surfaces 684b (683 b,682 b) engage the latch surfaces 764b (763 b,762 b) to secure the instrument seal assembly 600 and zero seal assembly 700 together. The zero seal wall 454 passes through the central bore 618 and is in an interference fit to seal the contact area.

The unlocking action process is as follows: with continued reference to fig. 20-23, a laterally upward unlocking force F is applied to the button 769 ₆ The latch frame 761 is actuated to move generally laterally upward (as viewed in the perspective of fig. 20) until the latch surfaces 684b (683 b,682 b) disengage from the latch surfaces 764b (763 b,762 b). So that the instrument seal assembly 600 can be separated from the zero seal assembly 700. The lock frame 761 moves upward and downward integrally to force the return arm 766 to compress and deform more elastically when the external force F is removed ₆ The return arm 766 then springs back rapidly to actuate the return of the lock 760.

The advantages and benefits achieved by this embodiment are substantially the same as those achieved by the first embodiment, and it should be noted that the return arm 766 of the lock 760 of this embodiment is disposed axially, thereby saving valuable lateral space, while being simpler in construction and more advantageous to manufacture.

Fig. 24-30 depict in detail another implementation of a zero seal assembly 700a. The zero seal assembly 700a is substantially identical in structure and composition to the seal assembly 700, with only the structure of the lock being different. Referring to fig. 23, the seal assembly 700a includes a body 710, a lock 860, a zero seal 450, a second firmware 770, and a valve assembly 490. In this example, the body 710 further includes two stop posts 726.

Referring to fig. 25-26, the locking member 860 is a generally U-shaped fork structure including a button 868 and first and second locking

arms

867, 869 that are generally symmetrically disposed on opposite sides of the button 868. The latch 860 includes a first latching member 864, a second latching member 863 and a third latching member 862. The first, second, third latch members 864 (863, 862) mate with the first, second, and third lower extension arms 684 (683, 682), respectively, of the instrument seal cartridge 600. The first, second and third latch members 864 (863, 862) are arranged in a triangular configuration corresponding to the first, second and third lower extension arms 684 (683, 682). The first, second and third latching members 864 (863, 862) each include a proximally facing cam surface 864a (863 a,862 a); likewise, the first, second and third latch members 864 (863, 862) include distally facing latch surfaces 864b (863 b,862 b) shaped and dimensioned to mate with the latch surfaces 684b (683 b,682 b) of the first, second and third lower extension arms 684 (683, 682). The locking element 860 further includes a return arm 866, the return arm 866 including a resilient cantilever 866a and a resilient tip 866b, the resilient cantilever 866a being an elongate arm having good resilient capabilities. The locking element 860 also includes a guide slot 865, the guide slot 865 including a guide slot proximal end 865a and a guide slot distal end 865b. The first lock arm 867 further includes a first cam portion 867a and a first resilient portion 867b; the second lock arm 869 also includes a second cam portion 869a and a second resilient portion 869b.

Referring now to fig. 27-30, the lock 860 is mounted to the body 710, sandwiched between the stop bar 722 and the wall portion 771; the button 868 mates with the button mount 724; the positioning column 723 is matched with the guide groove 865; the return arms 866 are in contact with the inner wall 426 and are in a pre-compressed state. Referring now to the interference fit of 21,4 mounting posts 778 with 4 hollow fixing posts 721, the second retainer 770 is fixed with the body 710. The flange portion 456 of the zero seal 450 is sandwiched between the inner wall 426 and the second retainer 770 and the flange 456 is in a compressed state. The lock 860 is sandwiched between the stop bar 722 and the second fastener 770 in a clearance fit.

During the locking action, referring to fig. 22, when the instrument seal assembly 600 is axially snapped downward toward the zero seal assembly 700a, the cam surface 684a first presses against the cam surface 864a to displace the locking member 860 laterally upward and to elastically deform the return arm 866 more. At the same time, the cam surface 682a presses against the cam surface 862a, forcing the resilient portion 867b to resiliently deform so as to bias the first locking arm 867 laterally outwardly (as indicated by the arrow in fig. 30); also, the cam surface 683a presses against the cam surface 863a, forcing the resilient portion 869b to resiliently deform, causing the first locking arm 869 to deflect laterally outwardly. When the cam surfaces 684a (683 a,682 a) fully clear the cam surfaces 764a (763 a,762 a), the return arms 866 resiliently return, the resilient portions 867b resiliently return, and the resilient portions 869b resiliently return such that the latch surfaces 684b (683 b,682 b) engage the latch surfaces 764b (763 b,762 b) to secure the instrument seal assembly 600 and zero seal assembly 700a together.

During the unlocking action, when a transverse upward unlocking force F is applied to the button 769 ₇ Actuating the latch 860 as a whole laterally upward (as viewed from the perspective of fig. 29) until the latch surface 684b disengages from the latch surface 764 b; simultaneously, the locking member 860 is moved generally laterally upward and the stop post 726 presses against the cam portion 867a and cam portion 869a, causing the resilient portion 867b to resiliently deform to force the first locking arm 867 laterally outward, as well as causing the resilient portion 867b to resiliently deform to force the first locking arm 867 laterally outward until the latch surfaces 683b,682b disengage from the latch surfaces 763b,762b, thereby allowing the instrument seal assembly 600 to be separated from the zero seal assembly 700 a. When the unlocking force F7 is removed, the return arm 866 is elastically returned, and the elastic portion 867b is elastically returned and the elastic portion 869b is elastically returned so that the entire lock 860 is completely returned.

The advantages and benefits achieved by this embodiment are substantially the same as those achieved by the second embodiment, and it should be noted that this embodiment has a greater automatic return of the locking member 860 than the second embodiment due to the second, third locking member 863 (862) being offset laterally outwardly to store energy in said first and second locking

arms

867, 869.

In another aspect of the present invention, a puncture outfit is provided having a contoured design for facilitating gripping operations. More generally, the buttons are disposed on the sleeve assembly while not interfering with the right-hand and left-hand grip areas. As discussed in the background, when a physician holds a needle penetrating the abdominal wall of a patient, the distal end of the needle may accidentally damage tissue inside the patient. Therefore, the ergonomics of the puncture outfit model are important, the puncture outfit model is designed to be convenient for a doctor to hold, and particularly, the puncture outfit model is well matched with various hand shapes and various holding methods, thereby being beneficial to improving the control capability of the doctor when carrying out puncture operation on the holding puncture outfit and reducing the risk of accidental injury. In order to better control the puncturing process, the technique of holding the puncture outfit during the abdominal wall puncture in the operation has been standardized and immobilized so far. Fig. 31-32 depict one of the most common techniques for holding a puncture outfit currently in use. Fig. 31-32 depict the gripping procedure by way of example of a puncture instrument 1000a (illustrated as a 12mm gauge XCEL puncture instrument) that has been mass produced and sold under the trade name "XCEL" as disclosed in US patent 8029475. The penetrator 1000a includes a needle 100a and a cannula assembly 200a. The sleeve assembly 200a includes an instrument seal assembly and a zero seal assembly and a rotational locking system that selectively connects the two together. The sleeve assembly 200a is first defined as having a front side and a rear side opposite the front side of the valve assembly 106, and left and right side sides (as viewed in fig. 31). The rotational locking system comprises a push button 107 protruding from the left side to the outside of the casing assembly housing.

As shown in fig. 31, the right hand 110R holds the puncture outfit 1000a, the palm center of the right hand is tightly attached to the back of the puncture outfit, the middle finger 103 is buckled at the junction of the sleeve of the puncture outfit and the lower casing, and the junction of the palm and the wrist is tightly attached to the top of the puncture outfit, so that the force can be conveniently applied. Meanwhile, the thumb 105 is attached to the intersection area of the left side surface and the front surface of the puncture outfit, and the ring finger 102 and the little finger 101 are attached to the right side surface of the puncture outfit, so that the puncture outfit is controlled at the palm center. And the index finger 104 abuts against the cannula of the puncture outfit to control the direction of puncture and to help control the depth of penetration of the puncture outfit through the abdominal wall, thereby preventing accidents. The standard method of holding the puncture instrument 1000a by a right-handed physician illustrated in fig. 31 is that the protruding button 107 is just in the space between thumb and index finger, which is a good or near perfect operating experience.

Fig. 32 shows a standard procedure for a left-handed physician to grasp the puncture instrument 1000a, and the grasping posture or procedure is difficult to change due to the presence of the air valve assembly 106, and the grasping procedure is substantially the same as that of fig. 31. The left hand 110L holds the puncture outfit 1000a, the left palm center is clung to the back of the puncture outfit, the middle finger 103 is buckled at the junction of the sleeve of the puncture outfit and the lower shell, and the junction of the palm and the wrist is clung to the top of the puncture outfit, so that the force is conveniently applied. Meanwhile, the thumb 105 is attached to the intersection area of the right side surface and the front surface of the puncture outfit, and the ring finger 102 and the little finger 101 are attached to the left side surface of the puncture outfit, so that the puncture outfit is controlled at the palm center. And the index finger 104 abuts against the cannula of the puncture outfit to control the direction of puncture and to help control the depth of penetration of the puncture outfit through the abdominal wall, thereby preventing accidents. The standard method of holding the puncture instrument 1000a by a left-handed physician illustrated in fig. 31, the protruding button 107 interferes with the holding position of the ring finger 102 or the little finger 101, and the operation experience is not perfect or poor.

In the prior art disclosed at present, a plurality of quick locking mechanisms for realizing quick connection and disconnection between an instrument sealing assembly and a zero sealing assembly are arranged, wherein the quick locking mechanism mainly composed of movable locking pieces (the movable locking piece mechanism for short) is convenient to disassemble and reassemble, and is widely applied. The presently disclosed cannula assemblies having a movable locking mechanism typically have its unlocking button disposed in the left-hand region of the cannula assembly, which is well suited for right-handed surgeon handling, but not for left-handed surgeon handling. According to incomplete statistics, people who use left hands in China account for about 8-12% of the general population, the proportion of left hands used in Europe and America is relatively higher, and the proportion of left hands used by doctor groups is higher than that of the general public. However, in the field of medical device design, many medical devices, such as forceps, tweezers, scissors, etc., are designed and manufactured according to the right hand habit, and it is sometimes very inconvenient for a left-handed doctor to use these medical devices. So far, many designers have generally ignored the need for a left-handed doctor.

In addition, locating the button 107 on the side of the cannula assembly 200a presents other problems. For example, when the sleeve assembly 200a is secured to the patient's abdominal wall, typically the back of the sleeve assembly is proximate the patient's skin and the valve assembly 106 faces away from the skin, such that the corners of the valve assembly 106 are prevented from damaging the patient's skin; and because operation at different angles is often required in the operation, the sleeve assembly is often caused to deflect to a certain extent, so that the left side surface or the right side surface of the sleeve assembly is close to the skin of a patient, and the condition that the sleeve assembly is integrally overturned to the front surface of the sleeve assembly to contact the skin of the patient is rare. The button 107 is disposed on the left side of the cannula assembly, and when the cannula assembly is deflected to the left side to contact the patient's skin, the button 107 presses the patient's skin for an extended period of time, which may cause a bruise or other damage.

Fig. 33-35 depict an improved button setup method. The sleeve set 200 is defined to have a front region 210 on one side of the valve assembly 490, a rear region 270 on the opposite side of the front region, and left and

right regions

230 and 250 on both sides. Referring to fig. 35, in greater detail, a first datum plane a is defined through the geometric center of the valve assembly 490 and the axis 10, a second datum plane B is defined through the axis 10 at an angle of 45 ° to the first datum plane a, and a third datum plane C is defined through the axis 10 that is symmetrical to the second datum plane B with respect to the first datum plane a. The second datum surface B and the third datum surface C intersect the housing of the ferrule assembly 200 to divide the housing of the ferrule assembly 200 into 4 substantially equally divided regions, namely the front region 210, the left region 230, the right region 250 and the rear region 270 described above. The button 436 is disposed in the front region 210 on the upper side of the valve assembly 490 (i.e., closer to the proximal end relative to the valve assembly 490). The button 436 may be axially aligned with the valve assembly 490 and then in some cases, both may be disposed axially out of alignment to allow for ease of opening and closing the valve assembly and pressing the button. More precisely, the buttons 436 are provided in reasonable locations in the front area that do not interfere with the standard left-handed and right-handed gripping methods.

Figs. 36-37 illustrate standard right-handed and left-handed grips, respectively, of the penetrator 1000 of the present invention. As shown in fig. 36, the puncture outfit 1000 is held by the right hand 110R, the palm center of the right hand is closely attached to the rear of the puncture outfit, the middle finger 103 is buckled at the junction of the sleeve and the lower casing of the puncture outfit, and the junction of the palm and the wrist is closely attached to the top of the puncture outfit, so that the force can be conveniently applied. Meanwhile, the thumb 105 is attached to the intersection area of the left side surface and the front surface of the puncture outfit, and the ring finger 102 and the little finger 101 are attached to the right side surface of the puncture outfit, so that the puncture outfit is controlled at the palm center. And the index finger 104 abuts against the cannula of the puncture outfit to control the direction of puncture and to help control the depth of penetration of the puncture outfit through the abdominal wall, thereby preventing accidents. As shown in fig. 37, the left hand 110L holds the puncture outfit 1000, the left palm center is tightly attached to the back of the puncture outfit, the middle finger 103 is buckled at the junction of the sleeve and the lower shell of the puncture outfit, and the junction of the palm and the wrist is tightly attached to the top of the puncture outfit, so that the force can be conveniently applied. Meanwhile, the thumb 105 is attached to the intersection area of the left side surface and the front surface of the puncture outfit, and the ring finger 102 and the little finger 101 are attached to the right side surface of the puncture outfit, so that the puncture outfit is controlled at the palm center. And the index finger 104 abuts against the cannula of the puncture outfit to control the direction of puncture and to help control the depth of penetration of the puncture outfit through the abdominal wall, thereby preventing accidents. It is apparent that the buttons 436 are positioned so as not to interfere with the standard left-handed and right-handed gripping methods.

Many different embodiments and examples of the invention have been shown and described. One of ordinary skill in the art will be able to make adaptations to the method and apparatus by appropriate modifications without departing from the scope of the invention. Such as the snap lock mechanism disclosed in other inventions, with slight adaptations, the button arrangement area of the present invention may be employed. Several modifications have been mentioned, and other modifications are conceivable to the person skilled in the art. The scope of the present invention should therefore be determined with reference to the appended claims, rather than with reference to the structures, materials, or acts illustrated and described in the specification and drawings.

Claims

1. A cannula assembly comprising an automatic reset lockout including an instrument seal, a zero seal, a first fastener, a second fastener, a top housing, a lower housing, and a hollow cannula connected thereto; the instrument seal is clamped between the top shell and the first fixing piece and mutually fixed to form an instrument seal assembly, and the zero seal is clamped between the lower shell and the second fixing piece and mutually fixed to form a zero seal assembly; the method is characterized in that:

1) The zero seal assembly further includes a lock that is limited in a clearance fit between the lower housing and a second retainer, the lock moving in a transverse plane that is generally perpendicular to the hollow sleeve axis;

2) The lock piece comprises a button, a lock piece frame and an elastic reset arm, wherein the button, the lock piece frame and the elastic reset arm are connected to form a whole and are made of plastic materials;

3) The first fixing piece and the locking piece are matched with each other to form a first locking part, a second locking part and a third locking part, and the first locking part, the second locking part and the third locking part are matched with each other to fix the instrument sealing assembly and the zero sealing assembly together;

4) The unlocking external force is applied to drive the button, and the corresponding movement of the locking piece enables the first locking part, the second locking part and the third locking part to be unlocked, so that the instrument sealing assembly and the zero sealing assembly can be separated from each other; removing the unlocking external force, and driving the lock to reset by the elastic reset arm;

5) The lock further includes a transverse shaft passing through the button and generally perpendicular to the axial direction of the sleeve assembly;

6) The locking piece comprises a first locking hook, a second locking hook and a third locking hook, wherein the first locking hook and the second locking hook are arranged at the near-end position of the locking piece frame along the transverse axis direction and are rigidly connected with the locking piece frame into a whole, and the third locking hook is arranged at the far-end position of the locking piece frame along the transverse axis direction and is connected with the locking piece frame into a whole through a flexible arm;

7) The first firmware comprises a first lock catch, a second lock catch and a third lock catch, the first lock catch and the first lock hook are matched to form the first locking part, the second lock catch and the second lock hook are matched to form the second locking part, and the third lock catch and the third lock hook are matched to form the third locking part;

8) And the unlocking external force is applied to drive the button to transversely move towards the direction in the sleeve assembly, the first lock hook and the second lock hook move in the same direction as the button to unlock, and the flexible arm elastically deforms and drives the third lock hook to move in the opposite direction to the button to unlock.

2. The cannula assembly of claim 1, wherein: the first firmware comprises a first lip, the second firmware comprises a second lip, and the first lip and the second lip are matched with each other to form lip matching; the lip engagement primarily limits lateral movement of the instrument seal assembly and the zero seal assembly, while the first, second, and third locking portions primarily limit axial movement of the instrument seal assembly and the zero seal assembly.

3. The cannula assembly of claim 2, wherein: the first fastener includes a lower annular wall that is in contact with the zero seal and forms an airtight seal at the contact location.

4. The cannula assembly of claim 1, wherein:

a) The lock piece frame comprises a first lock catch component, a second lock catch component and a third lock catch component; each latch member includes a proximally-facing angled cam surface and an opposite latch surface;

b) The first firmware comprises a first lower extension arm, a second lower extension arm and a third lower extension arm, wherein the first lower extension arm, the second lower extension arm and the third lower extension arm are arranged corresponding to the lock piece; each lower extension arm includes a cam surface and a latch surface;

c) The first, second and third latch members are distributed to cooperate with the first, second and third lower extension arms to form the first, second and third latch portions.

5. The cannula assembly of claim 4, wherein:

a) The lock further includes a transverse shaft passing through the button and generally perpendicular to the axial direction of the sleeve assembly;

b) The lock piece frame is formed by a closed annular structure;

c) The first locking component is arranged at the far end position of the locking piece frame along the transverse axis direction, and the second locking component and the third locking component are arranged at two sides of the near end position of the locking piece frame along the transverse axis direction;

d) And the first, second and third locking parts move in the same direction with the button to unlock, the unlocking external force is removed, and the elastic reset arm drives the locking piece to reset.

6. The cannula assembly of claim 5, wherein:

b) The lock piece frame is formed into a non-closed fork-shaped structure by a first locking arm and a second locking arm which are arranged on two sides of the button, the first locking arm comprises a first cam part and a first elastic arm part, and the second locking arm comprises a second cam part and a second elastic arm part;

c) The first locking component is arranged at the near end position of the locking piece along the transverse axis direction, the second locking component is arranged at the far end of the first locking arm, and the third locking component is arranged at the far end of the second locking arm;

d) Applying unlocking external force to drive the button to move towards the inside of the sleeve assembly along the transverse shaft, wherein the first locking component and the button move in the same direction to unlock; the first cam part and the second cam part are mutually pressed with the lower shell or the second firmware to force the first elastic arm part and the second elastic arm part to elastically deform, so that the first locking arm and the second locking arm do integral offset movement to unlock the second locking component and the third locking component; and removing the unlocking external force, and driving the locking piece to reset by the elastic reset arm.