Tissue fixing device with clutch locking function

Abstract

The invention relates to a tissue fixing device with a clutch locking function. The tissue fixing device comprises a supporting mechanism, a clutch mechanism and a locking control assembly. The supporting mechanism comprises a fixed connecting assembly and a driving assembly capable of axially moving, and the driving assembly controls opening and closing actions of the clamping mechanism through axial displacement. The clutch mechanism transmits axial thrust and pulling force to the driving assembly by driving the operating rod. The locking control assembly achieves position locking of the driving assembly through cooperation of the sliding driving part and the limiting part, and when the sliding driving part is located at the initial position, the limiting part is engaged to lock axial movement; and unlocking when sliding to a preset position. Clutch transmission and sliding type mechanical locking are combined, so that the driving performance of quick response of the clamping mechanism is guaranteed, and the tissue clamping stability is guaranteed through a double-locking mechanism.

Description

[0001] The present application is a divisional application of the original application with the application number 2021115966679 (application date: December 24, 2021, and the invention name: driving control mechanism of a tissue fixation device and the tissue fixation device). TECHNICAL FIELD

[0002] The present application relates to the technical field of medical devices, in particular to a tissue fixation device with clutch locking function. BACKGROUND

[0003] The most common treatment for mitral regurgitation relies on prosthetic valve replacement, as well as valve repair reshaping, such as posterior leaflet quadrangular resection, chord folding, edge-to-edge repair technology, artificial chord implantation technology. These technologies usually rely on open heart surgery, in which the patient's chest is usually opened by sternal incision, and the patient is placed on cardiopulmonary bypass.

[0004] Valve clamp instruments developed according to the principle of surgical valve edge-to-edge suture technology are currently the most recognized because of their high safety, simple technical principle and great feasibility.

[0005] The tissue fixation devices in the prior art generally have the technical contradiction that the response speed and the positioning stability are difficult to balance. Taking a typical valve clamping instrument as an example, its driving mode mainly includes two types: one type adopts a direct telescopic driving structure, such as the linear sliding of a sliding groove driving part in a guide sliding groove, which can achieve fast opening and closing response, but lacks an effective mechanical locking mechanism, so it is easy to drift in the clamping state due to the influence of the tissue reaction force or external vibration, resulting in attenuation of the clamping force and even loosening of the instrument; the other type adopts other locking structures, which can maintain clamping stability, but are often complex in structure and inconvenient to operate, making it difficult to achieve the coordination of fast driving and instant locking. This technical defect directly restricts the operation reliability of minimally invasive surgical instruments in complex environments, especially in clinical applications such as heart valve repair, which requires high clamping precision, and the prior art cannot meet the dual requirements of fast response and stable locking. SUMMARY

[0006] In order to solve the above technical problems, the present application provides a tissue fixation device with clutch locking function, which adopts the cooperation form of fixed connection components and driving components that can move relatively in the axial direction, achieves the purpose of fast driving the clamping mechanism to realize opening and closing, and at the same time cooperates the operating rod of the clutch mechanism and the threaded connection of the driving component to realize the transmission of axial push-pull force, ensuring the directness of operation, and maintaining the stability of the clamping state through the self-locking property of the thread. The locking control component can effectively lock the driving component when it slides to different positions, preventing the loosening of the clamping mechanism and realizing the stable clamping of the tissue.

[0007] Specifically, the following options are included: A tissue fixation device with a clutch locking function includes: a clamping mechanism, a support mechanism, a clutch mechanism, and a locking control component; The support mechanism includes a fixed connection assembly and a drive assembly that can move axially relative to it. The drive assembly drives the opening and closing of the clamping mechanism by moving axially relative to the fixed connection assembly. The drive assembly includes a first limiting part and a transmission rod clutch end. The clutch mechanism includes a lever, which transmits axial thrust and pull to the drive assembly by driving the lever, thereby controlling the opening and closing of the clamping mechanism; The locking control component includes a slider and a locking component; the sliding drive portion of the slider is slidably disposed on the outside of the fixed connection component; the locking component includes a second limiting portion that matches the first limiting portion; when the sliding drive portion is in the initial position, the second limiting portion contacts the first limiting portion, restricting the axial movement of the drive component relative to the fixed connection component; when the sliding drive portion slides from the initial position to the first preset position, the second limiting portion can radially disengage from the first limiting portion.

[0008] Furthermore, the control lever includes a control lever clutch end and an external force drive shaft, and the control lever clutch end and the transmission rod clutch end are axially fixed relative to each other through a screw connection of internal and external threads.

[0009] Furthermore, the fixed connection assembly is provided with a locking tongue cavity; the locking member includes a locking tongue positioning member; and the sliding drive part is provided with an unlocking opening. When the sliding drive unit is in the initial position, the unlocking opening is misaligned with the locking tongue cavity, and the second limiting part contacts the first limiting part, restricting the axial movement of the drive component relative to the fixed connection component; When the sliding drive unit slides to the first preset position, the unlocking opening aligns with the latch cavity, and the latch positioning member can move radially, causing the second limiting part to disengage from the first limiting part, thereby releasing the lock on the drive assembly.

[0010] Furthermore, the locking control component also includes an unlocking actuator; The unlocking drive is connected to the sliding drive and is used to provide a driving force to the sliding drive toward a first preset position.

[0011] Furthermore, the unlocking drive component is a pull wire; the pull wire passes through the double-hole connection hole of the sliding drive part, and by pulling the pull wire, the sliding drive part slides from the initial position to the first preset position.

[0012] Furthermore, the first limiting part is a plurality of arc-shaped grooves arranged along the axial direction of the drive assembly; The latch positioning member has a spherical or cylindrical structure, and the end of the latch positioning member is a second limiting part that matches the arc-shaped groove.

[0013] Furthermore, the first limiting part is a first threaded locking part provided on the outer surface of the driving component; The locking component further includes a locking threaded sleeve and a threaded unlocking elastic component, and the second limiting part is a second threaded locking part disposed inside the locking threaded sleeve and matching the first threaded locking part.

[0014] Furthermore, the locking threaded sleeve is a sleeve structure with a sidewall slot, and the threaded unlocking elastic element is located in the sidewall slot and provides a compressive force to expand the sidewall slot.

[0015] Furthermore, the slider also includes an elastic reset part, the proximal end of which is axially fixed relative to the fixed connection assembly; the elastic reset part applies a biasing force toward the initial position to the sliding drive part during the sliding drive part sliding from the initial position to the first preset position.

[0016] Furthermore, the unlocking drive component is a push rod, and the elastic reset part is an elastic compression component located near the end of the sliding drive part. The push rod is used to push the sliding drive part from the initial position to the first preset position to release the lock on the drive component.

[0017] Furthermore, it also includes a limiting sleeve, which is connected to the fixed connection assembly. The limiting sleeve has a limiting snap-fit ​​portion that matches the proximal end of the elastic reset portion to restrict the axial movement of the proximal end of the elastic reset portion.

[0018] As described above, the present invention has the following beneficial effects: 1) This application achieves the purpose of quickly driving the clamping mechanism to open and close by adopting a combination of a fixed connection component and a drive component that can move directly relative to each other axially. The axial push and pull force is transmitted through the threaded connection between the control lever of the clutch mechanism and the drive component, ensuring the directness of operation, and the stability of the clamping state is maintained through the self-locking characteristic of the thread.

[0019] 2) The locking control component can effectively lock the drive component when it slides to different positions, preventing the clamping mechanism from loosening and achieving stable clamping of the tissue.

[0020] 3) This application achieves sliding control of the drive unit by pulling a cable, and the cable is matched with the cable connection hole. When the cable is released, one end of the foldable cable is released and the other end is pulled, thus pulling the cable out of the double hole. 4) An assisting elastic element is provided. In conjunction with the driving method of this application, by adding an assisting elastic element, the internal force generated by the capture clamp can be partially or completely offset, thereby reducing the friction of the system. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the present invention, the accompanying drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0022] Appendix Figure 1 This is a schematic diagram of the external structure of the drive control mechanism in a locked state according to an embodiment of this application; Appendix Figure 2 This is a schematic diagram of the external structure of the drive control mechanism in the unlocked state according to an embodiment of this application; Appendix Figure 3 This is a schematic diagram of the slider in the extended and compressed states according to an embodiment of this application; Appendix Figure 4 This is a schematic diagram of the structure of the limiting sleeve in the first form of the embodiment of this application; Appendix Figure 5 This is a schematic diagram of the main components of the fixed connection assembly according to an embodiment of this application; Appendix Figure 6 This is a schematic diagram of the internal structure of the locking control component of the first form of this application in the locked state; Appendix Figure 7 This is a schematic diagram of the drive component of the first form according to the embodiments of this application from two perspectives; Appendix Figure 8 This is a schematic diagram of the internal structure and inner cross-section of the joystick according to an embodiment of this application; Appendix Figure 9 This is a schematic diagram of the internal structure of a second-type locking control component in a locked state according to an embodiment of this application. Appendix Figure 10 This is a schematic diagram of the internal structure of a second-type locking control component in the unlocked state according to an embodiment of this application. Appendix Figure 11 This is a schematic diagram of the structure of the driving component in the second form of the embodiment of this application. Appendix Figure 12 This is a structural diagram of the locking threaded sleeve according to an embodiment of this application; Appendix Figure 13This is a schematic diagram of the structure of the second type of limiting sleeve in the embodiments of this application. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. In this embodiment, "proximal end" refers to the direction closer to the operator; "distal end" refers to the direction farther away from the operator. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] This application employs a combination of a fixed connection component and a drive component capable of direct relative axial movement, achieving the purpose of quickly driving the clamping mechanism to open and close. Simultaneously, a locking control component effectively locks the drive component when it slides to different positions, preventing loosening of the clamping mechanism and achieving stable tissue clamping. See the following embodiment for a detailed implementation process: Example 1: This embodiment includes a tissue fixation device with a clutch locking function, wherein the tissue fixation device includes a clamping mechanism 1000 for closing tissue; a support mechanism 2000 for mounting the clamping mechanism 1000; and a clutch mechanism 3000 at the proximal end of the support mechanism 2000 for being detachably connected to a transport control assembly for transporting and controlling the tissue closure device.

[0025] In conventional tissue fixation devices, taking a heart valve clamping and fixation device as an example, the clamping mechanism 1000 includes a pair of closures 1100 and a pair of catchers 1200 corresponding to each closure 1100. The closures 1100 are opened and closed by a drive assembly 2200, while the catchers 1200 are opened and closed by a control line. When clamping tissue, clamping is achieved through the cooperation of the inner side of the closure 1100 and the outer side of the catcher 1200. The fixation device of this application is delivered to a designated location on the heart via a delivery control assembly, for example, to the mitral valve. After reaching the lesion location, the position where the anterior and posterior leaflets of the heart valve cannot properly align is clamped by the cooperation of the closures 1100 and catchers 1200 of the clamping mechanism 1000 in this embodiment, so that the part that cannot properly align is brought together, thereby allowing the mitral valve to close completely or reducing the opening area, thereby alleviating or treating mitral regurgitation.

[0026] After the mitral valve clamping is completed, the fixation device is then separated from the delivery control component by the clutch mechanism 3000, so that the fixation device remains at the lesion site to keep the valve fixed.

[0027] In this embodiment, the support mechanism 2000 includes a fixed connection assembly 2100 and a drive assembly 2200 that can move relative to the fixed connection assembly 2100. The distal end of the drive assembly 2200 is connected to two closure members, so that when the drive assembly 2200 moves relative to the fixed connection assembly 2100, it controls the opening or closing of the closure members 1100. The clamping mechanism 1000 cooperates with the gripper 1200 to clamp tissue. When the drive assembly 2200 moves relative to the fixed connection assembly 2100, the slide drive member can slide relative to the guide slide to drive the two closed clamping parts 1110 to move closer or further apart.

[0028] The drive assembly 2200 specifically includes a drive shaft 2230 and a transmission rod clutch end 2220. Correspondingly, the clutch mechanism 3000 includes a control lever 3100. The control lever 3100 is provided with a control lever clutch end 3120 and an external force drive shaft 3110 for transmitting force. The control lever clutch end 3120 and the transmission rod clutch end 2220 are axially fixed relative to each other. Therefore, the axial thrust and pull can be transmitted to the drive assembly 2200 by driving the control lever 3100, thereby controlling the two closed clamping parts 1110 to move closer or further apart.

[0029] In this embodiment, the lever clutch end 3120 and the transmission lever clutch end 2220 are specifically screwed together by the engagement of internal and external threads, thus enabling the transmission of axial tensile and thrust forces. When it is necessary to separate the lever clutch end 3120 from the transmission lever clutch end 2220, the lever 3100 is controlled to rotate relative to the drive assembly 2200, thereby disengaging the threaded connection between the lever 3100 and the drive assembly 2200.

[0030] In this embodiment, since the drive assembly 2200 can be directly pushed or pulled forward and backward by the drive lever 3100, rapid positioning and clamping actions can be achieved. However, the prior art currently lacks a mechanism that can effectively lock and unlock at any time, enabling rapid positioning and clamping by unlocking when drive is needed, and locking at any time when the clamping mechanism reaches the preset position without requiring continuous external force to maintain a stable locked state.

[0031] To achieve the above objectives, in this embodiment, a locking control component 4000 is specifically provided. The locking control component includes a slider 4100 and a locking component 4200. The sliding drive portion 4110 of the slider 4100 is slidably sleeved on the outside of the fixed connection component 2100. The locking component 4200 includes a second limiting portion that matches the first limiting portion 2210. When the sliding drive portion 4110 is in the initial position, the second limiting portion at least partially contacts the first limiting portion 2210, thereby restricting the second limiting portion radially. Due to the restriction of the sliding drive portion 4110, the second limiting portion cannot disengage from the first limiting portion 2210 radially, so that the locking component 4200 restricts the axial movement of the drive component 2200 relative to the fixed connection component 2100. When the sliding drive portion 4110 slides from the initial position to the first preset position, the second limiting portion can disengage from the first limiting portion 2210 radially. In conjunction with the aforementioned locking control component, the drive component can be effectively locked when slid to different positions, preventing the clamping mechanism from loosening and achieving stable clamping of the tissue.

[0032] Specifically, in this embodiment, in order to effectively drive the sliding drive unit 4110 to slide between the initial position and the first preset position, the locking control component 4000 further includes an unlocking drive unit 4300. The unlocking drive unit 4300 is connected to the sliding drive unit 4110 and is used to provide a driving force toward the first preset position to the sliding drive unit 4110. In accordance with the above-mentioned settings, in this embodiment, the sliding unit 4100 also includes an elastic reset unit 4120. During the process of the sliding drive unit 4110 sliding from the initial position to the first preset position, the elastic reset unit 4120 applies a biasing force toward the initial position to the sliding drive unit 4110.

[0033] Therefore, the process of the unlocking drive 4300 driving the sliding drive part 4110 toward the first preset position is the process of overcoming the deformation force generated by the elastic reset part 4120.

[0034] In this embodiment, the elastic reset part 4120 is an elastic compression member located near the sliding drive part 4110. Therefore, the process of the sliding drive part 4110 moving towards the first preset position is the process of compressing the elastic reset part 4120. During the compression process, the elastic reset part 4120 generates a thrust that squeezes the sliding drive part 4110 towards the distal end. The unlocking drive part 4300 is a pull wire, and the first preset position is located near the initial position. The proximal end of the elastic reset part 4120 is axially fixed relative to the fixed connection assembly 2100. Therefore, after releasing the unlocking drive part 4300, the sliding drive part 4110 is reset under the push of the elastic reset part 4120. More preferably, the elastic reset part 4120 is a tubular structure with multiple hollow features on its main body. The hollow texture can be diamond-shaped or other shapes. When the tube is subjected to pressure, the hollow texture is compressed, and the axial length of the tube decreases. When the external force is eliminated or reduced, the texture begins to return to its natural state, and the axial length of the tube is restored.

[0035] In another embodiment, the elastic reset part 4120 can also be an elastic tension member located near the proximal end of the sliding drive part 4110. Therefore, the process of the sliding drive part 4110 moving towards the first preset position is the process of stretching the elastic reset part 4120. During the stretching process, the elastic reset part 4120 generates a pulling force that pulls the sliding drive part 4110 towards the proximal end. Correspondingly, the unlocking drive member 4300 is a push rod, with the first preset position located at the distal end of the initial position. The proximal end of the elastic reset part 4120 is axially fixed relative to the fixed connection assembly 2100. Therefore, the unlocking process is the process of the push rod overcoming the pulling force of the elastic reset part 4120 and pushing the sliding drive part 4110 towards the distal end.

[0036] Besides the two implementations of the elastic reset part mentioned above, other methods can be used to unlock by pulling or pushing the sliding drive part, and to reset and lock under the action of the elastic reset part. In this embodiment, it is preferable to use a pull wire to achieve sliding control of the drive part. The pull wire is relatively easier to enter the human body with the device and is also easier to eventually detach.

[0037] Specifically, when the unlocking drive component 4300 is a pull cable, the sliding drive part 4110 is provided with a pull cable connection hole 4111. The pull cable connection hole 4111 has a double-hole structure. The unlocking drive component 4300 passes through one hole and exits through the other hole. Therefore, the pull cable can pull the sliding drive part 4110 to the proximal end by pulling the spacer between the two holes. When the pull cable is released, one end of the foldable pull cable is released, and the other end is pulled, thus pulling the pull cable out of the double holes. More preferably, there can be multiple pull cable connection holes 4111, which are evenly arranged on the outside of the sliding drive part 4110, corresponding to the number of pull cables. Simultaneously pulling multiple pull cables can achieve stable driving.

[0038] In addition, to prevent the locking control component 4000, which is sleeved on the fixed connection component 2100, from deflection and axial movement towards the other end, in this embodiment, the locking control component 4000 further includes a limiting sleeve 4400. The limiting sleeve 4400 is fixedly connected to the fixed connection component 2100, and the limiting sleeve 4400 has a limiting latching portion 4410 that matches and connects to the proximal end of the elastic reset portion 4120 to restrict the axial movement of the proximal end of the elastic reset portion 4120. Furthermore, the distal end of the sliding drive portion 4110 preferably also has a base clearance opening 4113, which can match the protruding shape of the fixed connection component 2100 to ensure that it can only undergo axial compression and expansion on the fixed connection component 2100 without rotation.

[0039] In this embodiment, preferably, the main body of the limiting sleeve 4400 is a tubular structure, which is fixed to the fixed connection assembly 2100 by welding, bonding or other means. It is provided with a limiting sleeve groove 4410 corresponding to the lug at the proximal end of the elastic reset part 4120, which is used to limit the axial movement and circumferential rotation of the elastic reset part 4120. At the same time, it is provided with a limiting sleeve engaging part 4420, which engages in the grab clamp groove, which is used to limit the axial movement and circumferential rotation of the grab clamp body in this example.

[0040] Furthermore, in order to achieve the following in this embodiment, when the sliding drive unit 4110 is in the initial position, the second limiting part is radially restricted. At this time, the second limiting part is at least partially in contact with the first limiting part 2210, and due to the restriction of the sliding drive unit 4110, the second limiting part cannot be radially disengaged from the first limiting part 2210, so that the locking member 4200 restricts the axial movement of the drive assembly 2200 relative to the fixed connection assembly 2100; when the sliding drive unit 4110 slides from the initial position to the first preset position, the second limiting part can radially disengage from the first limiting part 2210. The specific arrangement and cooperation relationship of the first limiting part and the second limiting part will be described in detail below.

[0041] In this embodiment, the locking member 4200 includes a latch positioning member 4210; the fixed connection assembly 2100 is provided with a latch cavity 2110 for radial movement of the latch positioning member 4210; preferably, the latch positioning member 4210 is a spherical or cylindrical structure, and the end of the latch positioning member 4210 is a second limiting part that matches the arc-shaped limiting groove. That is, the end of the latch positioning member 4210 is directly used as a shape that matches the first limiting part for locking and limiting; specifically, the sliding drive part 4110 is provided with an unlocking opening 4112, which can be a long hole provided on the sliding drive part 4110, the hole diameter of which is greater than the minimum outer diameter of the latch positioning member 4210, but smaller than the maximum outer diameter of the latch positioning member 4210, so that part of the latch positioning member 4210 can extend out, but will not fall out completely.

[0042] This ensures that when the sliding drive unit 4110 is in its initial position, its inner wall is in contact with the outer wall of the fixed connection assembly 2100, thereby restricting the radial movement of the latch positioning member 4210; when the sliding drive unit 4110 is in the first preset position, the unlocking opening 4112 is aligned with the latch cavity 2110, so that the radial movement of the latch positioning member 4210 causes the first limiting part 2210 to disengage from the second limiting part. Preferably, the curvature of the arc-shaped limiting groove can be set such that when the sliding drive unit 4110 is in the first preset position, if the latch positioning member 4210 is still located in the arc-shaped limiting groove, and the drive assembly 2200 is axially displaced, the arc surface of the arc-shaped limiting groove can squeeze the latch positioning member 4210 out of the arc-shaped limiting groove.

[0043] Example 2: The main difference between this embodiment and Embodiment 1 is the way the locking element 4200 is set.

[0044] In this embodiment, the locking member 4200 also includes a latch positioning member 4210; the fixed connection assembly 2100 is provided with a latch cavity 2110 for radial movement of the latch positioning member 4210; Furthermore, in this embodiment, the difference from Embodiment 1 is that the locking member 4200 further includes a locking threaded sleeve 4220 and a threaded unlocking elastic member 4230. Correspondingly, the first limiting part 2210 is a first threaded locking part provided on the outer surface of the driving component 2200; the second limiting part is a second threaded locking part 4221 provided on the inner side of the locking threaded sleeve 4220 and matching the first threaded locking part. That is to say, in this embodiment, the axial restriction between the fixed connection component 2100 and the driving component 2200 is achieved by thread-to-thread mating, thus the positioning is more precise and easier to control than in Embodiment 1. However, to achieve the threaded engagement, the locking threaded sleeve 4220 needs to be pressed by the locking tongue positioning member 4210. In addition, in this embodiment, the transmission rod clutch end 2220 and the first limiting part 2210 are integrally formed. The thread on the transmission rod clutch end 2220 and the thread on the first limiting part 2210 have the same outer diameter and can be formed in one process. The transmission rod clutch end 2220 is threadedly connected to the internal thread of the control rod clutch end 3120 through the thread at the proximal end.

[0045] Preferably, in this embodiment, the locking threaded sleeve 4220 is a sleeve structure with a side wall groove, and the thread unlocking elastic element 4230 is located in the side wall groove and provides a squeezing force to expand the side wall groove; wherein, the locking threaded sleeve 4220 can be a C-shaped sleeve structure, and the thread unlocking elastic element 4230 is disposed at the opening of the C-shaped sleeve, or it can be a locking threaded sleeve 4220 formed by splicing two semi-shell-shaped threaded sleeves, with two thread unlocking elastic elements 4230 respectively disposed between the two semi-shell-shaped threaded sleeves.

[0046] Specifically, the sliding drive unit 4110 is provided with an unlocking opening 4112. The unlocking opening 4112 can be an elongated hole provided on the drive unit 4110. The hole diameter is greater than the minimum outer diameter of the latch positioning member 4210, but smaller than the maximum outer diameter of the latch positioning member 4210. Therefore, part of the latch positioning member 4210 can be extended, but it will not fall out completely.

[0047] This allows the inner wall of the sliding drive unit 4110 to fit against the outer wall of the fixed connection assembly 2100 when it is in the initial position, thereby restricting the radial movement of the locking tongue positioning member 4210; the locking tongue positioning member 4210 presses against the locking threaded sleeve 4220, causing the threaded unlocking elastic member 4230 to be in a compressed state; the locking tongue positioning member 4210 presses against the outer surface of the locking threaded sleeve 4220 to counteract the extrusion force of the threaded unlocking elastic member 4230, so that the second threaded locking part 4221 cooperates with the first threaded locking part to lock.

[0048] When the sliding drive unit 4110 is in the first preset position, the unlocking opening 4112 aligns with the locking tongue cavity 2110, causing the locking tongue positioning member 4210 to move radially and disengage the first limiting part 2210 from the second limiting part. Under the restoring force of the threaded unlocking elastic member 4230, the locking threaded sleeve 4220 tends to open, and the first threaded lock disengages from the second threaded lock part 4221, thereby enabling the drive assembly 2200 to move axially relative to the fixed connection assembly 2100.

[0049] In this document, the directional terms such as front, back, top, and bottom are defined based on the location of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application.

[0050] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0051] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A tissue fixation device with a clutch locking function [Mao 1], characterized in that, include: Clamping mechanism (1000), support mechanism (2000), clutch mechanism (300) and locking control assembly (4000); The support mechanism (2000) includes a fixed connection assembly (2100) and a drive assembly (2200) that is axially movable relative to it. The drive assembly (2200) drives the opening and closing of the clamping mechanism (1000) by axially moving relative to the fixed connection assembly (2100). The drive assembly (2200) includes a first limiting part (2210) and a transmission rod clutch end (2220). The clutch mechanism (300) includes a lever (3100), which transmits axial thrust and pull to the drive assembly (2200) by driving the lever (3100), thereby controlling the opening and closing of the clamping mechanism (1000); The locking control assembly (4000) includes a slider (4100) and a locking member (4200); the sliding drive part (4110) of the slider (4100) is slidably disposed on the outside of the fixed connection assembly (2100); the locking member (4200) includes a second limiting part that matches the first limiting part (2210); when the sliding drive part (4110) is in the initial position, the second limiting part contacts the first limiting part (2210) to restrict the axial movement of the drive assembly (2200) relative to the fixed connection assembly (2100); when the sliding drive part (4110) slides from the initial position to the first preset position, the second limiting part can radially disengage from the first limiting part (2210).

2. The tissue fixation device according to claim 1, characterized in that, The control lever (3100) includes a control lever clutch end (3120) and an external force drive shaft (3110). The control lever clutch end (3120) and the transmission rod clutch end (2220) are axially fixed relative to each other by internal and external thread screw connection.

3. The tissue fixation device according to claim 1, characterized in that, The fixed connection assembly (2100) is provided with a locking tongue cavity (2110); the locking member (4200) includes a locking tongue positioning member (4210); the sliding drive part (4110) is provided with an unlocking opening (4112). When the sliding drive unit (4110) is in the initial position, the unlocking opening (4112) is misaligned with the locking tongue cavity (2110), and the second limiting part contacts the first limiting part (2210), restricting the axial movement of the drive assembly (2200) relative to the fixed connection assembly (2100); When the sliding drive part (4110) slides to the first preset position, the unlocking opening (4112) is aligned with the latch cavity (2110), and the latch positioning member (4210) can move radially, so that the second limiting part is disengaged from the first limiting part (2210), thereby releasing the lock on the drive assembly (2200).

4. The tissue fixation device according to claim 1, characterized in that, The locking control assembly (4000) also includes an unlocking drive (4300). The unlocking drive (4300) is connected to the sliding drive (4110) and is used to provide the sliding drive (4110) with a driving force toward a first preset position.

5. The tissue fixation device according to claim 4, characterized in that, The unlocking drive component (4300) is a pull wire; the pull wire is inserted into the double-hole connection hole (4111) of the sliding drive part (4110), and the sliding drive part (4110) is slid from the initial position to the first preset position by pulling the pull wire.

6. The tissue fixation device according to claim 3, characterized in that, The first limiting part (2210) is a plurality of arc-shaped grooves arranged along the axial direction of the drive assembly (2200); The latch positioning member (4210) has a spherical or cylindrical structure, and the end of the latch positioning member (4210) is a second limiting part that matches the arc-shaped groove.

7. The tissue fixation device according to claim 3, characterized in that, The first limiting part (2210) is a first threaded locking part provided on the outer surface of the drive assembly (2200); The locking member (4200) further includes a locking threaded sleeve (4220) and a threaded unlocking elastic member (4230), and the second limiting part is a second threaded locking part (4221) disposed inside the locking threaded sleeve (4220) and matching the first threaded locking part.

8. The tissue fixation device according to claim 7, characterized in that, The locking threaded sleeve (4220) is a sleeve structure with a side wall slot, and the threaded unlocking elastic element (4230) is located in the side wall slot and provides a compressive force to expand the side wall slot.

9. The tissue fixation device according to claim 4, characterized in that, The slider (4100) further includes an elastic reset part (4120), the proximal end of which is axially fixed relative to the fixed connection assembly (2100); during the process of the sliding drive part (4110) sliding from the initial position to the first preset position, the elastic reset part (4120) applies a biasing force toward the initial position to the sliding drive part (4110).

10. The tissue fixation device according to claim 9, characterized in that, The unlocking drive (4300) is a push rod, and the elastic reset part (4120) is an elastic compression member located near the sliding drive part (4110). The push rod is used to push the sliding drive part (4110) to slide from the initial position to the first preset position to release the lock on the drive assembly (2200).

11. The tissue fixation device according to claim 9, characterized in that, It also includes a limiting sleeve (4400), which is connected to the fixed connection assembly (2100). The limiting sleeve (4400) is provided with a limiting snap-fit ​​portion (4410) that matches the proximal end of the elastic reset portion (4120) to limit the axial movement of the proximal end of the elastic reset portion (4120).

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