Mechanism for preventing forcep opening of anastomat from being opened by mistake and endoscope cutting anastomat

Abstract

The utility model provides an anastomat forcep opening mistaken opening prevention mechanism and an endoscope cutting anastomat, and relates to the technical field of medical instruments, the anastomat forcep opening mistaken opening prevention mechanism comprises a button assembly and a limiting assembly, the button assembly is provided with a limiting part, an anastomosis handle assembly of the anastomat is provided with a positioning part, and when the limiting part is in positioning connection with the positioning part, the limiting part is connected with the positioning part. The anastomosis mechanism is in a closed state; the limiting assembly is in transmission connection with a cutting mechanism of the anastomat, and when the cutting mechanism feeds, the limiting assembly abuts against the button assembly so that the limiting part and the positioning part can be locked to be in a positioning connection state; through the limiting part and the positioning part, positioning connection of the button assembly and the anastomosis handle assembly can be achieved, through the limiting assembly in transmission connection with the cutting mechanism, when the cutting mechanism feeds, the limiting part and the positioning part can be locked to be in the positioning connection state, then the anastomosis handle assembly is locked, and the situation that in the feeding process, the anastomosis handle assembly is not damaged is effectively avoided. The anti-mistaken-opening effect is remarkable, and the safety and the reliability in use are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a mechanism for preventing accidental opening of the clamp jaws of a stapler and a laparoscopic cutting stapler. Background Technology

[0002] Laparoscopic staplers are widely used as medical devices in laparoscopic surgery.

[0003] Existing disposable laparoscopic staplers typically include a staple cartridge, an anvil, a cutting blade, a cannula, a stapler handle, and a firing handle. During surgery, the stapler handle rotates the anvil, closing it onto the staple cartridge to complete the anastomosis. The firing handle then feeds the cutting blade to complete the cutting. However, existing staplers are prone to misoperation during the cutting blade's feed, which can cause the staple cartridge and anvil to open accidentally, posing a safety risk. Utility Model Content

[0004] The purpose of this utility model is to provide a mechanism for preventing accidental opening of the jaws of a stapler and a laparoscopic cutting stapler, so as to solve the above-mentioned technical problems existing in the prior art; the preferred technical solutions among the many technical solutions provided by this utility model can produce many technical effects, as detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This utility model provides a mechanism to prevent accidental opening of the jaws of a stapler, comprising a button assembly and a limiting assembly. The button assembly has a limiting portion, and the stapler handle assembly for controlling the opening and closing of the stapler mechanism has a positioning portion adapted to the limiting portion. When the limiting portion and the positioning portion are positioned and connected, the stapler mechanism is in a closed state. The limiting assembly is drivenly connected to the cutting mechanism of the stapler. When the cutting mechanism advances, the limiting assembly abuts against the button assembly to lock the limiting portion and the positioning portion into a positioned connection state.

[0007] Preferably, the button assembly includes a reset button and a first compression spring, wherein: the reset button is rotatably mounted on the support mechanism of the anastomosis device, the limiting part is configured as a limiting groove, and the limiting groove is disposed on the reset button; the two ends of the first compression spring abut against the support mechanism and the reset button respectively.

[0008] Preferably, the limiting mechanism includes a limiting member and an elastic member, wherein: the limiting member is movably mounted on the support mechanism of the stapler; both ends of the elastic member abut against the limiting member and the support mechanism respectively; the limiting member abuts against the cutting mechanism; when the cutting mechanism is in the retracted position, the limiting member is in a first position and the elastic member is in a deformed state; when the cutting mechanism advances, the limiting member moves to a second position under the action of the elastic member; the reset button is provided with a first abutting surface, and the limiting member is provided with a second abutting surface adapted to the reset button; when the limiting member is in the second position, the first abutting surface abuts against the second abutting surface to lock the limiting part and the positioning part into a positioning connection state.

[0009] Preferably, the limiting member is a stop block with a sliding hole, and the support mechanism is provided with a guide post that slides with the sliding hole. The stop block is movably mounted on the guide post through the sliding hole. The elastic member is a second compression spring with its two ends abutting against the stop block and the support mechanism, respectively.

[0010] Preferably, the limiting member is a stop bar with a mounting hole, and the support mechanism is provided with a mounting shaft. The stop bar is rotatably mounted on the mounting shaft through the mounting hole. The elastic member is a torsion spring with a torsion spring on the mounting shaft and its two ends abutting against the stop bar and the support mechanism, respectively.

[0011] This utility model provides a laparoscopic cutting and anastomosis device, including an anastomosis mechanism, a cutting mechanism, a handle mechanism, a support mechanism, and any of the aforementioned anastomosis device anti-accidental opening mechanism.

[0012] Preferably, the handle mechanism includes an anastomosis handle assembly and a firing handle assembly, wherein: the anastomosis handle assembly is hinged to the support mechanism and connected to the anastomosis mechanism, and the positioning part is provided on the side of the anastomosis handle assembly away from the anastomosis mechanism; the firing handle assembly is hinged to the support mechanism and connected to the cutting mechanism.

[0013] Preferably, the anastomosis mechanism includes a jaw assembly and a sleeve assembly, wherein: the jaw assembly includes a staple cartridge seat and an anvil movably hinged to the staple cartridge seat; the sleeve assembly includes a swivel sleeve, an outer sleeve, an inner sleeve, and a fixing seat, the swivel sleeve and the outer sleeve are connected by a connecting piece, the outer sleeve is slidably sleeved on the inner sleeve, the outer sleeve is connected to the fixing seat, the fixing seat is slidably disposed on the support mechanism, and the inner sleeve passes through the outer sleeve and the fixing seat and is fixedly connected to the support mechanism.

[0014] Preferably, the cutting mechanism includes a cutting blade, a firing lever, a rack, and a pull-back handle, wherein: the cutting blade is movably disposed within the inner sleeve; one end of the firing lever is connected to the cutting blade, and the other end of the firing lever passes sequentially through the inner sleeve and the fixing seat, and is connected to the rack; when the cutting blade is in the retracted position, the rack abuts against the limiting component; when the cutting blade is in the forward position, the limiting component separates from the rack and abuts against the button component to lock the limiting part and the positioning part into a positioning connection state; the pull-back handle is slidably disposed on the support mechanism, and the pull-back handle is connected to the rack for returning the rack to its original position.

[0015] Preferably, the support mechanism includes a left support and a right support, which are arranged opposite to each other and form a mounting cavity for mounting the anastomosis mechanism, the cutting mechanism, the handle mechanism and the anastomosis device anti-misoperation jaw opening mechanism.

[0016] The present invention provides a stapler anti-accidental opening mechanism for the jaws and a laparoscopic cutting stapler, which have at least the following beneficial effects:

[0017] The anti-jaw-opening mechanism of the stapler includes a button assembly and a limit assembly. The button assembly and the limit assembly cooperate with each other to prevent the stapler's stapler mechanism from accidentally opening during the cutting action.

[0018] The button assembly is provided with a limiting part, and the anastomosis handle assembly for controlling the opening and closing of the anastomosis mechanism is provided with a positioning part adapted to the limiting part. The limiting assembly is connected to the cutting mechanism of the anastomosis device. In use, the anastomosis mechanism is closed by the anastomosis handle assembly. When closed, the limiting part and the positioning part are positioned and connected. When the cutting mechanism advances, the limiting assembly abuts against the button assembly, thereby locking the limiting part and the positioning part to the positioning connection state. At this time, the anastomosis handle assembly is in the locked state.

[0019] This utility model, through the limiting part and the positioning part, can realize the positioning connection between the button assembly and the anastomosis handle assembly. Through the limiting part, which is connected to the cutting mechanism of the anastomosis device, a resistance force can be applied to the button assembly when the cutting mechanism advances, thereby locking the limiting part and the positioning part to the positioning connection state, and thus locking the anastomosis handle assembly. This can effectively prevent the jaws from opening accidentally during the cutting process, and the anti-accidental opening effect is significant, greatly improving the safety and reliability of use. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a structural schematic diagram of one embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the matching mechanism in the open state according to one embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of an embodiment of the present invention in which the matching mechanism is in a closed state;

[0024] Figure 4 This is a structural schematic diagram from the main perspective of one embodiment of the present invention;

[0025] Figure 5 yes Figure 4 Schematic diagram of the cross-section of aa;

[0026] Figure 6 yes Figure 5 Enlarged view of part A;

[0027] Figure 7 This is a schematic diagram of the structure of the reset button of this utility model;

[0028] Figure 8 This is a structural schematic diagram of the reset button of this utility model from another perspective;

[0029] Figure 9 This is a schematic diagram of the structure of the stop block according to one embodiment of the present invention;

[0030] Figure 10 This is a structural schematic diagram of the stop block from another perspective of one embodiment of the present invention;

[0031] Figure 11 This is a schematic diagram of the internal structure of the body portion of one embodiment of the present invention;

[0032] Figure 12 This is a schematic diagram of the structure of the body portion of one embodiment of the present invention;

[0033] Figure 13 This is a front view schematic diagram of the body portion of one embodiment of the present invention;

[0034] Figure 14 yes Figure 13Schematic diagram of the cross-section of BB;

[0035] Figure 15 yes Figure 14 Enlarged view of part B;

[0036] Figure 16 This is a schematic diagram of the structure of the matching handle assembly of this utility model;

[0037] Figure 17 This is a schematic diagram of the structure of the sleeve portion of this utility model;

[0038] Figure 18 yes Figure 17 CC cross-sectional view;

[0039] Figure 19 yes Figure 17 Enlarged view of part C;

[0040] Figure 20 This is a schematic diagram of the inner sleeve of this utility model;

[0041] Figure 21 yes Figure 20 Enlarged view of part D;

[0042] Figure 22 This is a structural schematic diagram of the fixing base of this utility model;

[0043] Figure 23 This is a structural schematic diagram of the fixing base of this utility model from another perspective;

[0044] Figure 24 This is a schematic diagram of the left support structure according to one embodiment of the present invention;

[0045] Figure 25 This is a schematic diagram of the structure of the right support of this utility model;

[0046] Figure 26 This is a schematic diagram of the rack structure of this utility model;

[0047] Figure 27 This is a schematic diagram of another embodiment of the present invention;

[0048] Figure 28 This is a schematic diagram of another embodiment of the present invention with the matching mechanism in the open state;

[0049] Figure 29 yes Figure 29 Enlarged view of part E;

[0050] Figure 30 This is a schematic diagram of another embodiment of the present invention, in which the matching mechanism is in a closed state;

[0051] Figure 31This is a schematic diagram of the structure of the stop bar according to another embodiment of the present invention;

[0052] Figure 32 This is a schematic diagram of the left support structure according to another embodiment of the present invention.

[0053] Figure Labels

[0054] 1. Anastomosis Mechanism; 11. Staple cartridge seat; 12. Anvil seat; 13. Steering sleeve; 14. Outer sleeve; 15. Inner sleeve; 151. Annular groove; 16. Fixing seat; 161. Fixing hole; 162. First limiting rib; 163. Through hole; 17. Connecting piece; 2. Cutting Mechanism; 21. Cutting blade; 22. Firing lever; 23. Rack; 231. Mounting plate; 24. Pull-back handle; 241. Handle shaft; 3. Handle Mechanism; 31. Anastomosis handle assembly; 311. Positioning part; 32. Firing handle assembly; 4. Support Mechanism; 41. Left support; 411. 412. Guide post; 413. Mounting shaft; 414. Second abutting bar; 42. Right bracket; 421. Limiting surface; 422. Second limiting rib; 5. Anastomosing device anti-misoperation jaw opening mechanism; 51. Button assembly; 511. Reset button; 5111. Limiting part; 5112. First abutting surface; 512. First compression spring; 52. Limiting assembly; 521. Stop block; 5211. Second abutting surface; 5212. Sliding hole; 5213. Abutting surface; 5214. Transition surface; 522. Second compression spring; 523. Stop bar; 5231. Mounting hole; 5232. First abutting bar. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0056] Example 1:

[0057] This utility model provides a mechanism 5 for preventing accidental opening of the jaws of a stapler, as described in the reference. Figures 1 to 24 As shown, the anastomosis clamp anti-misoperation mechanism 5 includes a button assembly 51 and a limit assembly 52.

[0058] The button assembly 51 is provided with a limiting part 5111, and the anastomosis handle assembly 31 of the anastomosis device for controlling the opening and closing of the anastomosis mechanism 1 is provided with a positioning part 311 adapted to the limiting part 5111; when the limiting part 5111 and the positioning part 311 are positioned and connected, the staple cartridge seat 11 and the staple seat 12 of the anastomosis mechanism 1 are in a closed state.

[0059] The limiting component 52 is connected to the cutting mechanism 2 of the anastomosis device. When the cutting mechanism 2 advances, the limiting component 52 abuts against the button component 51, thereby locking the limiting part 5111 and the positioning part 311 to the positioning connection state. At this time, the anastomosis handle component 31 is in the locked state and cannot drive the anastomosis mechanism 1 to open.

[0060] This invention provides a limiting part 5111 on the button assembly 51 and a positioning part 311 on the mating handle assembly 31. The two parts work together to achieve a positioning connection between the button assembly 51 and the mating handle assembly 31. Through the limiting part 52, which is connected to the cutting mechanism 2, when the cutting mechanism 2 starts to move from the initial state and the blade is fed, the limiting part 52 applies a resistance force to the button assembly 51. By locking the positioning connection between the limiting part 5111 and the positioning part 311, the mating handle assembly 31 is locked, which can effectively prevent the jaws from opening accidentally when the blade is fed, making it safe and reliable to use.

[0061] As an optional implementation, the button assembly 51 includes a reset button 511 and a first compression spring 512.

[0062] The reset button 511 is hinged to the support mechanism 4 of the stapler. The limiting part 5111 is a limiting groove, which is set on the reset button 511. The positioning part 311 is a positioning protrusion, which is adapted to the limiting groove.

[0063] The two ends of the first compression spring 512 abut against the support mechanism 4 and the reset button 511, respectively.

[0064] The first compression spring 512 has at least two functions: firstly, it acts as a pressure force, which applies pressure to the reset button 511 to enable the limiting part 5111 and the positioning part 311 to be positioned and connected; secondly, it acts as a return function, which can drive the reset button 511 to return to its original position when the reset button 511 is not pressed.

[0065] As an optional implementation, the limiting mechanism includes a limiting member and an elastic member.

[0066] The limiting member is movably mounted on the support mechanism 4 of the stapler, and the two ends of the elastic member abut against the limiting member and the support mechanism 4 respectively. The limiting member abuts against the cutting mechanism 2.

[0067] The reset button 511 is provided with a first abutting surface 5112, and the limiting member is provided with a second abutting surface 5211. The first abutting surface 5112 is inclined, and the second abutting surface 5211 is adapted to the first abutting surface 5112.

[0068] When the cutting mechanism 2 is in the retracted position (i.e., the cutting mechanism 2 is in the initial state), the limiting member is in the first position. The cutting mechanism 2 limits the relative position of the limiting member to prevent it from moving. At this time, the elastic member is in a deformed state.

[0069] When the cutting mechanism 2 leaves the initial state and begins to feed, the limiting effect of the cutting mechanism 2 on the limiting member is released, the elastic potential energy of the elastic member is released, and a pushing force is applied to the limiting member. The limiting member moves to the second position. At this time, the first abutting surface 5112 abuts against the second abutting surface 5211, the reset button 511 cannot move, and the limiting part 5111 and the positioning part 311 are locked in the positioning connection state.

[0070] As an optional implementation, the limiting member is set as a stop 521, and the stop 521 is provided with a sliding hole 5212. The left bracket 41 of the bracket mechanism 4 is provided with a guide post 411 that is adapted to the sliding hole 5212. The guide post 411 passes through the sliding hole 5212 and slides with the sliding hole 5212. The stop 521 can move along the axial direction of the guide post 411. In order to ensure the stability of the movement process of the stop 521, the number of guide posts 411 and sliding holes 5212 is set to two.

[0071] The elastic element is configured as a second compression spring 522. A groove is provided on the stop block 521. The second compression spring 522 is disposed in the groove, and its two ends abut against the stop block 521 and the support mechanism 4, respectively.

[0072] Example 2

[0073] Example 2 is based on Example 1:

[0074] This utility model provides a laparoscopic cutting and anastomosis device, such as Figures 1 to 24 As shown, the laparoscopic cutting and anastomosis device includes an anastomosis mechanism 1, a cutting mechanism 2, a handle mechanism 3, a support mechanism 4, and an anastomosis device anti-misoperation mechanism 5.

[0075] The handle mechanism 3 includes a matching handle assembly 31 and a firing handle assembly 32.

[0076] The anastomosis handle assembly 31 is hinged to the support mechanism 4. A connecting rod is provided on the anastomosis handle assembly 31, and the connecting rod is hinged to the anastomosis mechanism 1. A positioning part 311 is provided on the side of the anastomosis handle assembly 31 away from the anastomosis mechanism 1. By pushing and pulling the anastomosis handle assembly 31, the closing and opening control of the jaw assembly of the anastomosis mechanism 1 can be realized.

[0077] The firing handle assembly 32 is hinged to the support mechanism 4 and is connected to the cutting mechanism 2. By pushing and pulling the firing handle assembly 32, the cutting action of the cutting blade of the cutting mechanism 2 can be realized.

[0078] As an optional implementation, the anastomosis mechanism 1 includes a jaw assembly and a sleeve assembly.

[0079] The jaw assembly includes a staple cartridge seat 11 and an anvil seat 12 movably hinged to the staple cartridge seat 11.

[0080] The sleeve assembly includes a steering sleeve 13, an outer sleeve 14, an inner sleeve 15, and a fixing seat 16. The first end of the steering sleeve 13 is hinged to the anvil seat 12, and the second end of the steering sleeve 13 is connected to the outer sleeve 14 via a connecting piece 17. The outer sleeve 14 is slidably fitted onto the inner sleeve 15. An annular mounting groove is provided on the outer wall of the end of the outer sleeve 14 away from the jaw assembly. An annular first limiting rib 162 is provided on the inner wall of the fixing seat 16. The fixing seat 16 is fitted onto the end of the outer sleeve 14, and the first limiting rib 162 is installed within the annular mounting groove. The fixing seat 16 is slidably mounted on the left bracket 41. A fixing plate is provided at the bottom of the 16, and a fixing hole 161 is provided on the fixing plate. The pin passes through the fixing hole 161 to connect with the connecting rod of the matching handle assembly 31. A through hole 163 is provided on the fixing seat 16 along the axial direction of the outer sleeve 14. The first end of the inner sleeve 15 is fixedly connected to the staple cartridge seat 11. The second end of the inner sleeve 15 passes through the outer sleeve 14 and the through hole 163 and is fixedly connected to the right bracket 42. An annular groove 151 is provided on the outer wall of the second end of the inner sleeve 15. A second limiting rib 422 adapted to the annular groove 151 is provided on the right bracket 42. The second limiting rib 422 is installed in the annular groove 151.

[0081] When the jaw assembly is closed, the fixing seat 16 is moved by the matching handle assembly 31, and the outer sleeve 14 and the steering sleeve 13 move synchronously, thereby pulling the nail seat 12 to rotate closer to the nail cartridge seat 11, so as to close the jaws.

[0082] Conversely, this opens the jaw assembly.

[0083] As an optional implementation, the cutting mechanism 2 includes a cutting blade 21, a firing lever 22, a rack 23, and a pull-back handle 24.

[0084] The cutting blade 21 is movably disposed within the inner sleeve 15; one end of the firing rod 22 is connected to the cutting blade 21, and the other end of the firing rod 22 passes through the inner sleeve 15 and the fixed seat 16 in sequence, and is connected to the rack 23. The end of the rack 23 away from the cutting blade 21 is provided with a mounting plate 231, and the mounting plate 231 is connected to the pull-back handle 24 through the handle shaft 241. The pull-back handle 24 is slidably disposed on the bracket mechanism 4.

[0085] When the cutting blade 21 is in the retracted position (i.e., the initial position), the mounting plate 231 of the rack 23 abuts against the abutting surface 5213 of the stop block 521. At this time, the stop block 521 is in the first position and the second compression spring 522 is in a compressed state.

[0086] When the cutting blade 21 advances, the stop block 521 separates from the rack 23, and the second compression spring 522 pushes the stop block 521 to move, so that its second abutting surface 5211 abuts against the first abutting surface 5112 of the reset button 511, thereby locking the limiting part 5111 and the positioning part 311 in the positioning connection state.

[0087] As an optional implementation, the support mechanism 4 includes a left support 41 and a right support 42, which are arranged opposite to each other and form an installation cavity for mounting the anastomosis mechanism 1, the cutting mechanism 2, the handle mechanism 3 and the anastomosis device anti-misoperation mechanism 5. The support mechanism 4 is the body shell structure of the entire anastomosis device.

[0088] The working process of the laparoscopic cutting stapler is as follows:

[0089] like Figure 2 As shown, in the initial state, the jaw assembly consisting of the pin seat 12 and the pin cartridge seat 11 is in the open state, the rack 23 is in the initial position, the mounting plate 231 of the rack 23 abuts against the abutting surface 5213 of the stop block 521, and the stop block 521 is in the first position.

[0090] When the anastomosis handle assembly 31 rotates counterclockwise around the hinge position, the power provided by the anastomosis handle assembly 31 is transmitted sequentially through the fixed seat 16, the outer sleeve 14, the connecting piece 17 and the steering sleeve 13 to the anastomosis seat 12, causing the anastomosis seat 12 to rotate towards the staple cartridge seat 11, thereby realizing the jaw closing action; at the same time, under the action of the first compression spring 512, the limiting part 5111 of the reset button 511 is positioned and connected with the positioning part 311 of the anastomosis handle assembly 31, fixing the anastomosis handle assembly 31, at which time the jaw is in the closed state.

[0091] like Figure 3 As shown, when the firing handle assembly 32 rotates counterclockwise around the hinge position, the firing handle assembly 32 drives the rack 23 to move forward through the pawl mechanism, and the power is transmitted to the cutting blade 21 through the firing rod 22, causing the cutting blade 21 to advance and perform the cutting action.

[0092] When the rack 23 leaves the initial position, the stop block 521 moves to the second position under the action of the second compression spring 522. At this time, its second abutting surface 5211 abuts against the first abutting surface 5112 of the reset button 511. The reset button 511 is restricted and cannot rotate clockwise. At this time, the jaws cannot open.

[0093] After cutting is completed, use the pull handle 24 to retract the rack 23, firing lever 22, and cutting blade 21 back to the initial position, completing the retraction action. During the retraction, the mounting plate 231 of the rack 23 slides along the transition surface 5214 of the stop block 521 to the abutment surface 5213. The stop block 521 compresses the second compression spring 522. When the rack 23 returns to the initial position, the stop block 521 moves to the first position. At this time, the second abutment surface 5211 of the stop block 521 separates from the first abutment surface 5112 of the reset button 511, and the positioning lock state is released.

[0094] Rotating the reset button 511 clockwise separates the positioning part 311 of the mating handle assembly 31 from the limiting part 5111 of the reset button 511. The fixing seat 16 moves backward, and the outer sleeve 14, connecting piece 17, and steering sleeve 13 move backward in sync, causing the nail holder 12 to rotate away from the nail cartridge seat 11. The jaws open. When the mating handle assembly 31 returns to the initial position, the jaws opening action is completed.

[0095] Example 3

[0096] The difference between Example 3 and Example 1 is that:

[0097] like Figures 25 to 32 As shown, the limiting member is a stop bar 523, and a mounting hole 5231 is provided in the middle of the stop bar 523. A mounting shaft 412 is provided on the left bracket 41 of the bracket mechanism 4. The mounting shaft 412 is sized to match the mounting hole 5231. The stop bar 523 is rotatably mounted on the mounting shaft 412 through the mounting hole 5231.

[0098] The elastic element is a torsion spring, which is mounted on the mounting shaft 412. A first abutment bar 5232 is provided on the stop bar 523, and a second abutment bar 413 is provided on the left bracket 41. The two ends of the torsion spring abut against the first abutment bar 5232 and the second abutment bar 413, respectively.

[0099] like Figure 28 and Figure 29 As shown, when the stapler is in the initial position, the handle shaft 241 of the pull-back handle 24 abuts against the first end of the stop lever 523, making the stop lever 523 fixed and unable to rotate. At this time, the second end of the stop lever 523 separates from the first contact surface 5112 of the reset button 511, and the reset button 511 can rotate clockwise, that is, the jaws can be opened.

[0100] like Figure 30As shown, when the stapler is in the firing state, the handle shaft 241 of the handle 24 is pulled back away from the initial position, the first end of the handle shaft 241 is separated from the stop bar 523, and the stop bar 523 rotates under the action of the torsion spring until the second end of the stop bar 523 abuts against the first contact surface 5112 of the reset button 511. At this time, the limiting part 5111 and the positioning part 311 are locked to the positioning connection state, the reset button 511 cannot be rotated, and the jaws cannot be opened.

[0101] After the firing action is completed, pull back the handle shaft 241 to drive the rack 23 back to its original position. At this time, the handle shaft 241 acts on the first end of the stop lever 523 again, causing the stop lever 523 to rotate counterclockwise. The second end of the stop lever 523 separates from the first contact surface 5112 of the reset button 511. The reset button 511 can rotate clockwise, and the jaws can open.

[0102] Example 4

[0103] The difference between Example 4 and Example 2 is that:

[0104] The limiting component of the laparoscopic cutting anastomosis device described in Example 4 adopts the structure of Example 3.

[0105] In the description of this application, it should be understood that the terms "upper", "lower", "inner", "outer", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0106] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" or "several" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0107] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0108] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A mechanism for preventing accidental opening of the jaws of a stapler, characterized in that, Includes button components and limiter components, among which: The button assembly is provided with a limiting part, and the anastomosis handle assembly of the anastomosis device for controlling the opening and closing of the anastomosis mechanism is provided with a positioning part adapted to the limiting part. When the limiting part and the positioning part are positioned and connected, the anastomosis mechanism is in a closed state. The limiting component is connected to the cutting mechanism of the anastomosis device. When the cutting mechanism advances, the limiting component abuts against the button component to lock the limiting part and the positioning part into a positioning connection state.

2. The anti-misoperational jaw opening mechanism of the stapler according to claim 1, characterized in that, The button assembly includes a reset button and a first compression spring, wherein: The reset button is rotatably mounted on the support mechanism of the stapler, and the limiting part is configured as a limiting groove, which is located on the reset button; The two ends of the first compression spring abut against the bracket mechanism and the reset button, respectively.

3. The anti-misoperational jaw opening mechanism of the stapler according to claim 2, characterized in that, The limiting component includes a limiting member and an elastic member, wherein: The limiting member is movably mounted on the support mechanism of the stapler. The two ends of the elastic member abut against the limiting member and the support mechanism respectively. The limiting member abuts against the cutting mechanism. When the cutting mechanism is in the retracted position, the limiting member is in the first position and the elastic member is in a deformed state. When the cutting mechanism advances, the limiting member moves to the second position under the action of the elastic member. The reset button is provided with a first abutting surface, and the limiting member is provided with a second abutting surface adapted to the reset button. When the limiting member is in the second position, the first abutting surface abuts against the second abutting surface to lock the limiting part and the positioning part into a positioning connection state.

4. The anti-misoperational jaw opening mechanism of the stapler according to claim 3, characterized in that, The limiting member is configured as a stop block, the stop block is provided with a sliding hole, the support mechanism is provided with a guide post that slides with the sliding hole, and the stop block is movably mounted on the guide post through the sliding hole; The elastic element is configured as a second compression spring, and the two ends of the second compression spring abut against the stop block and the support mechanism, respectively.

5. The anti-misoperational jaw opening mechanism of the stapler according to claim 3, characterized in that, The limiting component is configured as a stop bar, the stop bar is provided with a mounting hole, the bracket mechanism is provided with a mounting shaft, and the stop bar is rotatably mounted on the mounting shaft through the mounting hole; The elastic element is a torsion spring, which is mounted on the mounting shaft and its two ends abut against the stop bar and the support mechanism, respectively.

6. A laparoscopic cutting and anastomosis device, characterized in that, It includes an anastomosis mechanism, a cutting mechanism, a handle mechanism, a support mechanism, and a mechanism to prevent accidental opening of the jaws of the anastomosis device as described in any one of claims 1-5.

7. The laparoscopic cutting and anastomosis device according to claim 6, characterized in that, The handle mechanism includes a matching handle assembly and a firing handle assembly, wherein: The anastomosis handle assembly is hinged to the support mechanism, the anastomosis handle assembly is connected to the anastomosis mechanism, and the positioning part is provided on the side of the anastomosis handle assembly away from the anastomosis mechanism; The firing handle assembly is hinged to the support mechanism and is connected to the cutting mechanism.

8. The laparoscopic cutting and anastomosis device according to claim 7, characterized in that, The anastomosis mechanism includes a jaw assembly and a cannula assembly, wherein: The jaw assembly includes a staple cartridge seat and a staple anchor movably hinged to the staple cartridge seat; The sleeve assembly includes a steering sleeve, an outer sleeve, an inner sleeve, and a fixing seat. The steering sleeve is connected to the outer sleeve via a connecting piece. The outer sleeve is slidably sleeved on the inner sleeve. The outer sleeve is connected to the fixing seat. The fixing seat is slidably mounted on the support mechanism. The inner sleeve passes through the outer sleeve and the fixing seat and is fixedly connected to the support mechanism.

9. The laparoscopic cutting and anastomosis device according to claim 8, characterized in that, The cutting mechanism includes a cutting blade, a firing lever, a rack, and a pull-back handle, wherein: The cutting blade is movably disposed within the inner sleeve; One end of the firing rod is connected to the cutting blade, and the other end of the firing rod passes through the inner sleeve and the fixed seat in sequence, and is connected to the rack; When the cutting blade is in the retracted position, the rack abuts against the limiting component. When the cutting blade is in the forward position, the limiting component separates from the rack and abuts against the button component to lock the limiting part and the positioning part into a positioning connection state. The pull-back handle is slidably mounted on the support mechanism and is connected to the rack for returning the rack to its original position.

10. The laparoscopic cutting and anastomosis device according to claim 7, characterized in that, The support mechanism includes a left support and a right support, which are arranged opposite to each other and form a mounting cavity for mounting the anastomosis mechanism, the cutting mechanism, the handle mechanism and the anastomosis device anti-misoperation jaw opening mechanism.

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