A tissue traction device and a method for using the tissue traction device

Abstract

The embodiment of the present invention provides a tissue traction device and a method for using the tissue traction device, and relates to the technical field of medical devices. The tissue traction device provided by the embodiment of the present invention includes an outer tube assembly, a clamp seat, a clamp body and a cable assembly. The clamp seat is connected to the distal end of the outer tube assembly, the clamp body is used to clamp tissue, and the clamp body can be movably matched with the clamp seat. A first connecting structure is provided on the clamp body, and a second connecting structure is provided on the clamp seat. The first connecting structure is used to connect with the second connecting structure so that the clamp body is in a clamping and locking state. The cable assembly passes through the outer tube assembly, and the distal end of the cable assembly is connected to the clamp body so that the clamp body can be manipulated by the cable assembly. When the clamp body is in a clamping and locking state, the outer tube assembly remains connected to the clamp seat, so that when used in this way, the proximal end of the outer tube assembly extending outside the body can be operated to push and pull the clamp body in the body, thereby achieving traction of the tissue, and can better achieve an improvement in the surgical field of view.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a tissue traction device and a method for using the tissue traction device. Background Art

[0002] Endoscopic submucosal dissection (ESD) refers to the use of a modified needle knife under endoscopy to directly peel the mucosa from the submucosal layer. It evolved from endoscopic mucosal resection (EMR). Both ESD and EMR can remove lesions with an ordinary single-channel endoscope. However, EMR has the disadvantages of not being able to remove larger lesions in one piece, and it is difficult to conduct detailed pathological analysis on the fragmented specimens removed, the tumor stage is unclear, and there is a high risk of tumor recurrence. ESD has a high complete resection rate and good safety, which has expanded the indications for the resection of early gastrointestinal cancer and other tumors, and has gradually become a widely accepted minimally invasive surgical treatment method.

[0003] However, ESD has the problems of longer operation time, greater risk and more difficult operation than EMR. At the same time, EMR rarely bleeds during the operation, but during the ESD operation, if you are not careful, the field of vision will be covered with blood, and you have to stop bleeding and flush the field of vision continuously. Therefore, in order to obtain a good surgical field of vision, various endoscopic assisted traction technologies have emerged, such as dental floss traction. However, dental floss traction may damage tissues, and it is difficult to accurately grasp tissues. It can only pull but not push, and its ability to improve the surgical field of vision is limited. Summary of the invention

[0004] The purpose of the present invention includes, for example, providing a tissue traction device that can improve the technical problems in the prior art of difficulty in accurately grasping tissues and limited ability to improve surgical fields of view.

[0005] The purpose of the present invention also includes providing a method for using a tissue traction device, which can improve the technical problems in the prior art of difficulty in accurately grasping tissues and limited ability to improve surgical fields of view.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] An embodiment of the present invention provides a tissue traction device, which includes an outer tube assembly; a clamp seat, which is connected to the distal end of the outer tube assembly; a clamp body, which is used to clamp tissue and can movably cooperate with the clamp seat; a first connecting structure is provided on the clamp body, and a second connecting structure is provided on the clamp seat, and the first connecting structure is used to connect with the second connecting structure so that the clamp body is in a clamping and locking state; and a cable assembly, which passes through the outer tube assembly and the distal end of the cable assembly is connected to the clamp body so that the clamp body can be manipulated by the cable assembly; wherein the outer tube assembly is used to maintain connection with the clamp seat when the clamp body is in the clamping and locking state so as to manipulate the clamp body to pull the tissue.

[0008] Optionally, the tissue traction device also includes a first handle and a second handle that are slidably connected to each other, the proximal end of the outer tube assembly is detachably connected to the first handle, and the proximal end of the pull cable assembly is connected to the second handle, so that when the first handle and the second handle slide relative to each other, the pull cable assembly moves relative to the outer tube assembly.

[0009] Optionally, a clamping protrusion is provided at the proximal end of the outer tube assembly, and a clamping groove is provided at the first handle, and the clamping groove is clamped with the clamping protrusion;

[0010] Alternatively, the proximal end of the outer tube assembly is threadedly connected to the first handle;

[0011] Alternatively, a breakable portion is disposed at the proximal end of the outer tube assembly, and the breakable portion is used to break to separate the outer tube assembly from the first handle.

[0012] Optionally, the outer tube assembly includes a spring tube, a connecting tube and a fixed tube connected in sequence, the fixed tube is connected to the proximal end of the connecting tube, and the outer diameter of the fixed tube is larger than the outer diameter of the connecting tube to form the clamping protrusion; a groove connected to the clamping groove is opened on the first handle, the connecting tube is accommodated in the groove, and the distal end of the connecting tube extends outside the groove to be connected to the proximal end of the spring tube; the distal end of the spring tube is connected to the clamp seat.

[0013] Optionally, a support cap is provided at the distal end of the outer tube assembly, and the clamp seat is rotatably connected to the support cap, so that the clamp body is driven to rotate by the rotation of the cable assembly relative to the outer tube assembly.

[0014] Optionally, a first annular groove is formed on the inner circumferential wall of the support cap; the clamp seat includes a seat body and a support arm arranged on the seat body, one end of the support arm extends out of the outer circumferential wall of the seat body and is clamped in the first annular groove, so that when the support arm rotates along the first annular groove, the clamp seat rotates relative to the support cap, and when the clamp body is in the clamping and locking state, one end of the support arm is clamped in the first annular groove to keep the clamp seat connected to the support cap.

[0015] Optionally, the support arm is arranged obliquely relative to the axis of the seat body, and the proximal end of the support arm is located inside the seat body, and the distal end of the support arm is located outside the seat body, so that the distal end of the support arm extends out of the outer wall of the seat body and is stuck in the first annular groove.

[0016] Optionally, the support arm includes a first arm portion and a second arm portion connected to each other, the first arm portion and the second arm portion are respectively inclined relative to the axis of the base body, and the angle between the first arm portion and the axis is greater than the angle between the second arm portion and the axis; the second arm portion is connected to the base body, the first arm portion is located at the distal end of the second arm portion, and the distal end of the first arm portion is clamped in the first annular groove.

[0017] Optionally, the support arm also includes a third arm portion arranged at the proximal end of the second arm portion, the second connecting structure includes a limiting notch arranged at the proximal end of the third arm portion, and the first connecting structure includes a limiting protrusion arranged on the clamp body, and when the clamp body is in the clamping and locking state, the limiting protrusion is snapped into the limiting notch to limit the clamp body from sliding toward the distal end relative to the clamp seat.

[0018] Optionally, a slide groove is also provided on the seat body, the second connecting structure includes a proximal wall of the slide groove, the first connecting structure includes a first sliding protrusion arranged on the clamp body, the first sliding protrusion slides with the slide groove, and when the clamp body is in the clamping and locking state, the first sliding protrusion contacts the proximal wall of the slide groove to limit the clamp body from sliding proximally relative to the clamp seat.

[0019] Optionally, when the clamp is in an open state, the angle formed between the first arm portion and the axis of the seat body is α, and the angle formed between the second arm portion and the axis of the seat body is β; 20°≤α≤80°, 0°≤β≤60°.

[0020] Optionally, the inner circumferential wall of the support cap is provided with a second sliding protrusion, the outer circumferential wall of the clamp seat is provided with a second annular groove, and the second sliding protrusion cooperates with the second annular groove to enable the support cap to be rotatably connected to the clamp seat.

[0021] Optionally, the clamp seat includes a seat body and an insert, the distal end of the insert is embedded in the proximal end of the seat body, the proximal end of the outer peripheral wall of the insert is provided with a step portion, and the step portion and the proximal end surface of the seat body form the second annular groove.

[0022] Optionally, the clamp body includes a first clamp arm and a second clamp arm, the proximal end of the first clamp arm and the proximal end of the second clamp arm are rotatably connected, and the proximal end of the first clamp arm and / or the proximal end of the second clamp arm are connected to the cable assembly; a first slide groove is provided on the first clamp arm, a second slide groove is provided on the second clamp arm, a fixed shaft is provided on the clamp seat, the fixed shaft passes through the first slide groove and the second slide groove, the first clamp arm and the second clamp arm slide along the first slide groove and the second slide groove respectively relative to the fixed shaft, so that the clamp body can switch between an open state and a closed state.

[0023] Optionally, a hook structure is provided on the first clamp arm and the second clamp arm, and the first connection structure includes a hook provided on the clamp seat, and when the clamp body is in the clamping and locking state, the hook structure is engaged with the hook.

[0024] Optionally, the clamp body also includes a connecting shaft, and the proximal end of the first clamp arm and the proximal end of the second clamp arm are rotatably connected via the connecting shaft; the distal end of the cable assembly is sleeved with the connecting shaft, and the distal end of the cable assembly has a notch, so that when the tension applied to the distal end of the cable assembly reaches a preset value, the connecting shaft disengages from the notch to allow the distal end of the cable assembly to detach from the clamp body.

[0025] Optionally, the distal end of the cable assembly is a wire buckle, the wire buckle is sleeved with the connecting shaft, and when the tension applied to the wire buckle reaches a preset value, the wire buckle is deformed to enlarge the notch, and the connecting shaft is detached from the wire buckle from the notch.

[0026] Optionally, the distal end of the cable assembly comprises a first clamping arm and a second clamping arm which are arranged opposite to each other, and a through hole for clamping the connecting shaft and a notch communicating with the through hole are formed between the first clamping arm and the second clamping arm.

[0027] Optionally, the first clamp arm and the second clamp arm extend from both ends of the connecting shaft respectively; the distal end of the cable assembly includes a first release portion and a second release portion, the first release portion and the second release portion are respectively sleeved on both ends of the connecting shaft, and the first clamp arm and the second clamp arm are clamped between the first release portion and the second release portion.

[0028] Optionally, the clamp body includes at least two clamp arms, which are arranged around the axis of the clamp seat; the proximal ends of the at least two clamp arms are connected to each other, and when the clamp arms slide relative to the clamp seat in a direction from the distal end to the proximal end, the clamp arms contact the clamp seat so that the clamp arms have a tendency to close.

[0029] Optionally, the clamp arm includes a connecting portion, an intermediate portion and a clamping portion connected in sequence, the clamping portion is used to clamp the tissue, and the connecting portions of the at least two clamp arms are connected to each other; the intermediate portion is used to interfere with the clamp seat so that when the clamp arm slides relative to the clamp seat in a direction from the distal end to the proximal end, the clamp arm has a tendency to close.

[0030] Optionally, the middle portion is elastic, and when the clamp arm slides relative to the clamp seat in a direction from the proximal end to the distal end, the middle portion causes the clamp arm to have a tendency to open.

[0031] Optionally, the clamp body further comprises a connecting piece, and the connecting parts of the at least two clamp arms are respectively connected to the connecting piece; the connecting piece is connected to the distal end of the cable assembly.

[0032] Optionally, the connecting piece has at least two connecting protrusions, the connecting portion is provided with a clamping hole, and the clamping holes of the at least two clamping arms correspond one-to-one to the at least two connecting protrusions; the distal end of the cable assembly has a clamping gap and a connecting groove, the proximal end of the connecting portion is clamped in the clamping gap, and the proximal end of the connecting piece is clamped in the connecting groove; when the pulling force applied to the distal end of the cable assembly reaches a preset value, the connecting piece is disengaged from the connecting groove, and the connecting portion is disengaged from the clamping gap, and the distal end of the connecting portion expands outward to be clamped with the clamp seat.

[0033] Optionally, the connecting portions of the at least two clamping arms are integrally formed.

[0034] Optionally, the distal end of the cable assembly is detachably connected to the clamp body, and when the tension applied to the distal end of the cable assembly reaches a preset value, the distal end of the cable assembly is detached from the clamp body.

[0035] Optionally, a connecting hole is provided on the clamp body, and the axis of the connecting hole extends along the line connecting the proximal end and the distal end of the clamp body. The distal end of the cable assembly has a slot arranged along the circumference of the cable assembly. The distal end of the cable assembly passes through the connecting hole, and the clamp body is clamped in the slot. When the tension applied to the distal end of the cable assembly reaches a preset value, the distal end of the cable assembly disengages from the connecting hole.

[0036] Optionally, a hook hole is opened at the proximal end of the clamp body, and the distal end of the cable assembly is hooked with the hook hole, and when the tension applied to the distal end of the cable assembly reaches a preset value, the distal end of the cable assembly is disengaged from the hook hole.

[0037] An embodiment of the present invention further provides a method for using a tissue traction device. The method for using the tissue traction device comprises:

[0038] The distal end of the tissue traction device is sent into the body along the forceps channel of the endoscope;

[0039] Operating the handle of the tissue traction device so that the clamp body of the tissue traction device clamps the tissue and switches the clamp body to a clamping and locking state;

[0040] Disconnecting the handle from the outer tube assembly of the tissue traction device;

[0041] The endoscope is withdrawn, the clamp body remains connected to the outer tube assembly, and the proximal end of the outer tube assembly is located outside the body, so that the clamp body is driven by the outer tube assembly to pull the tissue.

[0042] Optionally, the step of disengaging the handle from the outer tube assembly of the tissue traction device comprises:

[0043] The distal end of the outer tube assembly is cut off to separate the outer tube assembly from the handle.

[0044] Optionally, a breakable portion is provided at the proximal end of the outer tube assembly, and the step of disengaging the handle from the outer tube assembly of the tissue traction device comprises:

[0045] The outer tube assembly is disconnected from the breakable portion to separate the outer tube assembly from the handle.

[0046] The beneficial effects of the tissue traction device and the method for using the tissue traction device according to the embodiments of the present invention include, for example:

[0047] The embodiment of the present invention provides a tissue traction device, which includes an outer tube assembly, a clamp seat, a clamp body and a cable assembly. The clamp seat is connected to the distal end of the outer tube assembly, the clamp body is used to clamp tissue, and the clamp body can be movably matched with the clamp seat. A first connection structure is provided on the clamp body, and a second connection structure is provided on the clamp seat, and the first connection structure is used to connect with the second connection structure, so that the clamp body is in a clamping and locking state. The cable assembly passes through the outer tube assembly, and the distal end of the cable assembly is connected to the clamp body, so that the clamp body can be manipulated by the cable assembly. When in use, the cable assembly is pulled relative to the outer tube assembly to move the clamp body relative to the clamp seat, so that the clamp body is opened or closed, and the repeated opening and closing adjustment of the clamp body is used to achieve accurate grasping of tissue. When the clamp body is in a clamping and locking state, the outer tube assembly remains connected to the clamp seat, so that the proximal end of the outer tube assembly extending outside the body can be operated to push and pull the clamp body in the body, thereby achieving traction of tissue, and can better achieve the improvement of surgical field of view, thereby helping to shorten the operation time and reduce the risk of surgery.

[0048] An embodiment of the present invention also provides a method for using a tissue traction device, which clamps tissue under direct vision of the endoscope by operating a handle, thereby ensuring the accuracy of tissue clamping and switching the clamp body to a clamping and locking state to ensure the stability of tissue clamping. Then, after the handle is detached from the outer tube assembly, the endoscope is withdrawn to allow the outer tube assembly to leave the clamp channel of the endoscope. In this way, other surgical instruments can be delivered into the body through the clamp channel of the endoscope for surgical operations. At the same time, since the proximal end of the outer tube assembly is located outside the body, the clamp body can be driven by the outer tube assembly to pull the tissue during the operation to obtain a good surgical field of view, thereby helping to shorten the operation time and reduce surgical risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0050] Figure 1 A schematic diagram of the overall structure of a tissue traction device provided by an embodiment of the present invention;

[0051] Figure 2 A schematic cross-sectional view of a local structure of a first tissue traction device provided by an embodiment of the present invention when the clamp is in an open state;

[0052] Figure 3 A schematic cross-sectional view of a local structure of a first tissue traction device provided by an embodiment of the present invention when the clamping body is in a clamping and locking state at a first viewing angle;

[0053] Figure 4 A schematic diagram of the structure of a handle in a tissue traction device provided by an embodiment of the present invention;

[0054] Figure 5 A schematic cross-sectional view of a local structure of a first tissue traction device provided by an embodiment of the present invention when the clamp is in a closed state;

[0055] Figure 6 A schematic diagram of another proximal structure of an outer tube assembly provided in an embodiment of the present invention;

[0056] Figure 7 for Figure 2 A magnified schematic diagram of the local structure at position VII in the middle;

[0057] Figure 8 A schematic cross-sectional view of a local structure of the first tissue traction device provided by an embodiment of the present invention when the clamping body is in a clamping and locking state at a second viewing angle;

[0058] Fig. 9 A schematic structural diagram of a first clamp provided by an embodiment of the present invention;

[0059] Fig.10 A schematic structural diagram of a second clamp provided by an embodiment of the present invention;

[0060] Fig.11 A schematic structural diagram of a third clamp provided by an embodiment of the present invention;

[0061] Fig.12 A schematic structural diagram of a fourth clamp provided by an embodiment of the present invention;

[0062] Fig.13 A schematic diagram of the structure of the first tissue traction device provided by an embodiment of the present invention after the cable assembly is separated from the clamp body;

[0063] Fig.14 A schematic cross-sectional view of a partial structure of a second tissue traction device provided by an embodiment of the present invention;

[0064] Fig.15 A schematic diagram of the partial structure of another cable assembly provided in an embodiment of the present invention.

[0065] Icons: 10-tissue traction device; 100-outer tube assembly; 110-spring tube; 120-connecting tube; 130-fixing tube; 140-support cap; 151-first ring groove; 152-second sliding protrusion; 160-incision; 200-pull cable assembly; 210-pull cable; 220-release piece; 221-slot; 222-matching part; 223-connecting groove; 224-wire buckle; 225-first clamping arm; 226-second clamping arm; 300-clamping seat; 310-seat body; 312-slide groove; 320-support arm; 321-first arm part; 322-second arm part; 323-third arm part; 324-limiting notch; 330-inlay Component; 331-step portion; 340-fixed axis; 350-second annular groove; 360-hooking; 400-clamping body; 410-first clamping arm; 411-first sliding groove; 412-bending hook structure; 420-second clamping arm; 421-second sliding groove; 430-limiting protrusion; 440-first sliding protrusion; 450-connecting component; 451-connecting protrusion; 452-hooking hole; 460-connecting axis; 470-connecting hole; 481-connecting portion; 482-middle portion; 483-clamping portion; 490-hook hole; 500-handle; 510-first handle; 511-hooking groove; 512-groove; 520-second handle; 600-matching component. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0067] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0068] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0069] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0070] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0071] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0072] Figure 1 This is a schematic diagram of the overall structure of the tissue traction device 10 provided in this embodiment. Figure 2 This is a schematic cross-sectional view of a local structure of the first tissue traction device 10 provided in this embodiment when the clamp body 400 is in an open state. Figure 3 This is a schematic diagram of a partial structural cross-section of the first tissue traction device 10 provided in this embodiment when the clamp body 400 is in a clamped and locked state at a first viewing angle. Figure 1-Figure 3 The present embodiment provides a tissue traction device 10, which includes an outer tube assembly 100, a clamp seat 300, a clamp body 400 and a cable assembly 200. The clamp seat 300 is connected to the distal end of the outer tube assembly 100, and the clamp body 400 is used to clamp tissue, and the clamp body 400 can be movably matched with the clamp seat 300. A first connection structure is provided on the clamp body 400, and a second connection structure is provided on the clamp seat 300. The first connection structure is used to connect with the second connection structure so that the clamp body 400 is in a clamping and locking state. The cable assembly 200 passes through the outer tube assembly 100, and the distal end of the cable assembly 200 is connected to the clamp body 400, so that the clamp body 400 is manipulated by the cable assembly 200. When in use, the cable assembly 200 is pulled relative to the outer tube assembly 100 to move the clamp body 400 relative to the clamp seat 300, so that the clamp body 400 is opened or closed, and the repeated opening and closing adjustment of the clamp body 400 is used to achieve accurate grasping of tissue. When the clamp body 400 is in a clamped and locked state, the outer tube assembly 100 remains connected to the clamp seat 300. When used in this way, the proximal end of the outer tube assembly 100 extending outside the body can be operated to push and pull the clamp body 400 inside the body, thereby achieving traction of the tissue and better improving the surgical field of view.

[0073] It should be noted that in the description of this embodiment, the "proximal end" of a component refers to the end of the component close to the outside of the human body when in use, and the "distal end" of a component refers to the end of the component close to the inside of the human body when in use. Since the clamp body 400 is located inside the human body and the handle 500 is located outside the human body when in use, the proximal end of the cable assembly 200 is the end of the cable assembly 200 close to the handle 500, and the distal end of the cable assembly 200 is the end of the cable assembly 200 close to the clamp body 400. Similarly, the proximal end of the outer tube assembly 100 is the end of the outer tube assembly 100 close to the handle 500, and the distal end of the outer tube assembly 100 is the end of the outer tube assembly 100 close to the clamp body 400.

[0074] The tissue traction device 10 provided in this embodiment is further described below:

[0075] Figure 4 This is a schematic diagram of the structure of the handle 500 of the tissue traction device 10 provided in this embodiment. Figure 1 and Figure 4 In this embodiment, the tissue traction device 10 further includes a first handle 510 and a second handle 520 that are slidably connected to each other. The proximal end of the outer tube assembly 100 is detachably connected to the first handle 510, and the proximal end of the cable assembly 200 is connected to the second handle 520, so that when the first handle 510 and the second handle 520 slide relative to each other, the cable assembly 200 moves relative to the outer tube assembly 100. At the same time, since the distal end of the cable assembly 200 is connected to the clamp body 400, and the distal end of the outer tube assembly 100 is connected to the clamp seat 300, when the cable assembly 200 moves relative to the outer tube assembly 100, the clamp body 400 moves relative to the clamp seat 300, so that the clamp body 400 is in an open state (such as Figure 2 ) and the closed state (as shown Figure 5 to switch between the two modes.

[0076] Specifically, when the second handle 520 moves in the first direction relative to the first handle 510, the cable assembly 200 moves in the first direction relative to the outer tube assembly 100, thereby pushing the clamp body 400 to move in the first direction relative to the clamp seat 300, so that the clamp body 400 switches to the open state. When the second handle 520 moves in the second direction relative to the first handle 510, the cable assembly 200 moves in the second direction relative to the outer tube assembly 100, thereby pushing the clamp body 400 to move in the second direction relative to the clamp seat 300, so that the clamp body 400 switches to the closed state. It should be noted that in this embodiment, the first direction is the direction from the proximal end to the distal end, in other words, the first direction is the direction from the handle 500 to the clamp body 400; the second direction is the opposite direction of the first direction, that is, the direction from the distal end to the proximal end, in other words, the second direction is the direction from the clamp body 400 to the handle 500.

[0077] Since the proximal end of the outer tube assembly 100 is detachably connected to the first handle 510, when the distal end of the cable assembly 200 is disengaged from the clamp body 400 and the clamp body 400 is in a clamped and locked state, the proximal end of the outer tube assembly 100 can be disassembled from the first handle 510 to achieve the separation of the outer tube assembly 100 from the first handle 510. At the same time, after the cable assembly 200 is pulled out of the outer tube assembly 100, the distal end of the outer tube assembly 100 still remains connected to the clamp seat 300, so as to form a traction structure for traction tissue through the outer tube assembly 100, the clamp seat 300 and the clamp body 400. Therefore, when the outer tube assembly 100 is separated from the first handle 510, only the traction structure for traction of the tissue formed by the outer tube assembly 100, the clamp seat 300 and the clamp body 400 is connected to the tissue in the body of the tissue traction device 10. At this time, the endoscope can be withdrawn to allow the outer tube assembly 100 to leave the clamp channel of the endoscope. In this way, in subsequent operations, the endoscope can be re-inserted into the human body, and surgical instruments can be inserted into the body along the clamp channel of the endoscope to perform surgical operations under direct vision of the endoscope. At the same time, during the surgical operation, the tissue is pulled by the traction structure to obtain a good surgical field of view, thereby playing the role of a second hand under the endoscope.

[0078] Optionally, the proximal end of the outer tube assembly 100 is snap-fitted with the first handle 510. The snap-fitting method is used to realize the detachable connection between the outer tube assembly 100 and the first handle 510, so that the disassembly process of the outer tube assembly 100 and the first handle 510 is simpler, thereby reducing the burden during the surgical operation. It can be understood that in other embodiments, other structures can also be used to realize the detachable connection between the outer tube assembly 100 and the first handle 510, such as screw connection.

[0079] Specifically, a snap-fitting protrusion is provided at the proximal end of the outer tube assembly 100, and a snap-fitting groove 511 snap-fitted with the snap-fitting protrusion is provided on the first handle 510. Before the clamp body 400 is switched to the clamping and locking state, the snap-fitting protrusion is clamped in the snap-fitting groove 511, and the outer tube assembly 100 and the first handle 510 are in a connected state. Therefore, the relative movement of the cable assembly 200 and the outer tube assembly 100 can be achieved through the first handle 510 and the second handle 520, thereby realizing the manipulation of the clamp body 400; when the clamp body 400 is switched to the clamping and locking state, the snap-fitting protrusion is removed from the snap-fitting groove 511, so that the outer tube assembly 100 and the first handle 510 can be separated, and then the pulling structure can be separated from the first handle 510, the second handle 520 and the cable assembly 200.

[0080] Optionally, the outer tube assembly 100 includes a spring tube 110, a connecting tube 120 and a fixed tube 130 connected in sequence. The fixed tube 130 is connected to the proximal end of the connecting tube 120, and the outer diameter of the fixed tube 130 is larger than the outer diameter of the connecting tube 120 to form a snap-on protrusion. The first handle 510 is provided with a groove 512 connected to the snap-on groove 511, the connecting tube 120 is accommodated in the groove 512, and the distal end of the connecting tube 120 extends outside the groove 512 to be connected to the proximal end of the spring tube 110. The distal end of the spring tube 110 is connected to the clamp seat 300. Specifically, the proximal end of the spring tube 110 is fixedly welded to the distal end of the connecting tube 120, and the proximal end of the connecting tube 120 is fixedly welded to the distal end of the fixed tube 130.

[0081] It should be noted that in the description of this embodiment, “connection” should be understood in a broad sense, and it can be a direct connection or an indirect connection through an intermediate connection member 450 , and it can be a fixed connection or a movable connection.

[0082] Specifically, the spring tube 110, the connecting tube 120 and the fixing tube 130 are all circular tubular parts, and the outer diameter of the connecting tube 120 is smaller than the outer diameter of the fixing tube 130. Therefore, the outer peripheral surface of the fixing tube 130 can be regarded as the proximal end of the outer peripheral surface of the connecting tube 120 protruding radially, and then the model layer is clamped and protruded. The first handle 510 is provided with a groove 512 connected to the clamping groove 511. The groove 512 is provided on the side wall of the first handle 510, and its proximal end is connected to the clamping groove 511, and the distal end passes through the distal end surface of the first handle 510. The width of the groove 512 matches the radial dimension of the connecting tube 120, and the width of the clamping groove 511 matches the radial dimension of the fixing tube 130. Since the radial dimension of the connecting tube 120 is smaller than the radial dimension of the fixing tube 130, the width of the groove 512 is smaller than the width of the clamping groove 511, so that the fixing tube 130 can be clamped in the clamping groove 511, and when the outer tube assembly 100 receives a push-pull force, the fixing tube 130 will not fall out of the clamping groove 511. The clamping groove 511 and the groove 512 both penetrate the side wall of the first handle 510, that is, the side wall has an opening connected with the clamping groove 511 and the groove 512. When it is necessary to disassemble the outer tube assembly 100 from the first handle 510, the fixing tube 130 and the connecting tube 120 can be taken out from the opening.

[0083] It should be noted that, in the present embodiment, the outer tube assembly 100 is detachably connected to the first handle 510 at the proximal end thereof so as to achieve the purpose of separating the outer tube assembly 100 from the first handle 510. It is understandable that, in actual use, the outer tube assembly 100 and the first handle 510 can also be separated by shearing or the like, or a breakable portion is provided at the proximal end of the outer tube assembly 100, and the outer tube assembly 100 and the first handle 510 are separated by breaking the breakable portion. For example, the breakable portion is provided as follows: Figure 6The cutout 160 shown can be set at the proximal end of the connecting tube 120, so that the wall thickness of the connecting tube 120 at the cutout 160 is smaller, which is convenient for the outer tube assembly 100 to be disconnected from there, or the proximal end of the outer tube assembly 100 is made of an easy-to-break material to form an easy-to-break portion, which can make the proximal end of the outer tube assembly 100 more easily disconnected from the easy-to-break portion.

[0084] Please refer to Figure 2 and Figure 3 In this embodiment, a support cap 140 is provided at the distal end of the outer tube assembly 100, and the clamp seat 300 is rotatably connected to the support cap 140, so that the clamp body 400 is driven to rotate by the rotation of the cable assembly 200 relative to the outer tube assembly 100. Specifically, the support cap 140 is fixedly connected to the distal end of the spring tube 110. By arranging the clamp seat 300 and the support cap 140 to be rotatably connected, before the clamp body 400 clamps the tissue, the clamp body 400 can be rotated by rotating the handle 500 and then by the cable assembly 200 to adjust the clamping angle. Optionally, the support cap 140 is welded and fixed to the distal end of the spring tube 110.

[0085] Optionally, a first annular groove 151 is formed on the support cap 140, and the clamp seat 300 includes a base body 310 and a support arm 320 disposed on the base body 310. One end of the support arm 320 extends out of the outer peripheral wall of the base body 310 and is clamped in the first annular groove 151, so that when the support arm 320 rotates along the first annular groove 151, the clamp seat 300 rotates relative to the support cap 140. Moreover, when the clamp body 400 is in a clamping and locking state, one end of the support arm 320 is still clamped in the first annular groove 151, so that the clamp seat 300 and the support cap 140 remain connected.

[0086] Optionally, the support arm 320 is arranged to be inclined relative to the axis of the seat body 310, and the proximal end of the support arm 320 is located on the inner side of the seat body 310, and the distal end of the support arm 320 is located on the outer side of the seat body 310, that is, the distal end of the support arm 320 extends out of the outer peripheral wall of the seat body 310, and the distal end of the support arm 320 is stuck in the first annular groove 151, so that the movement of the support arm 320 relative to the support cap 140 along the first direction or the second direction is limited by the first annular groove 151, and at the same time, the support arm 320 can rotate around the axis relative to the first annular groove 151, thereby realizing the rotational connection between the clamping seat 300 and the support cap 140.

[0087] It should be noted that in this embodiment, the rotational connection between the clamp seat 300 and the support cap 140 is achieved by setting the support arm 320 to be clamped in the first annular groove 151. It can be understood that in other embodiments, other structural parts can also be used to achieve the rotational connection between the clamp seat 300 and the support cap 140.

[0088] Please refer to Figure 2 , Figure 3 and Figure 5 In this embodiment, the support arm 320 includes a first arm portion 321 and a second arm portion 322 connected to each other. The first arm portion 321 and the second arm portion 322 are respectively arranged to be inclined relative to the axis of the seat body 310, and the angle between the first arm portion 321 and the axis is greater than the angle between the second arm portion 322 and the axis. The second arm portion 322 is connected to the seat body 310, and the first arm portion 321 is located at the distal end of the second arm portion 322, and the distal end of the first arm portion 321 is clamped in the first annular groove 151.

[0089] Specifically, a notch is provided at the proximal end of the seat body 310, and the notch is a first notch, and the arm 320 is provided at the first notch. The two sides of the second arm portion 322 are respectively connected to the two sides of the first notch along the circumference of the seat body 310, and under the action of external force, the angle between the second arm portion 322 and the axis of the seat body 310 is adjustable. The first arm portion 321 is provided at the distal end of the second arm portion 322, and the distal end of the first arm portion 321 extends out of the outer peripheral wall of the seat body 310, that is, the distance from the distal end of the first arm portion 321 to the axis of the seat body 310 is greater than the radial dimension of the outer peripheral wall of the seat body 310, so that the distal end of the first arm portion 321 is clamped in the first annular groove 151 and can rotate along the slide groove 312.

[0090] Figure 7 for Figure 2 The enlarged schematic diagram of the local structure at Ⅶ in the middle. Please refer to Figure 7 and Figure 2 Optionally, when the clamp 400 is in an open state, the angle formed between the first arm 321 and the axis of the seat 310 is α, 20°≤α≤80°; the angle formed between the second arm 322 and the axis of the seat 310 is β, 0°≤β≤60°.

[0091] In this embodiment, α=50°, β=20°. Thus, when the clamp body 400 is switched to the clamping and locking state, the angle between the first arm portion 321 and the axis of the base body 310 and the angle between the second arm portion 322 and the axis of the base body 310 change. At this time, the angle between the first arm portion 321 and the axis of the base body 310 is 20°, and the angle between the second arm portion 322 and the axis of the base body 310 is 0° (e.g., Figure 3 As shown in the figure, the distal end of the first arm 321 can still be inserted into the first annular groove 151, so that the clamping seat 300 and the supporting cap 140 are in a connected state. At the same time, when the clamping body 400 is in a closed state, the angle between the first arm 321 and the seat 310 is 30°, and the angle between the second arm 322 and the seat 310 is 0°.

[0092] It can be understood that in other embodiments, the angles α and β can also be set as needed, for example, α=20°, 25°, 30°, 35°, 40°, 45°, 55°, 60°, 65°, 70°, 75° or 80°, β=0°, 5°, 10°, 15°, 25°, 30°, 35°, 40°, 45°, 55° or 60°, which can meet the requirement that when the clamp body 400 is switched to the clamping and locking state, there is still a sufficient angle between the first arm portion 321 and the axis of the seat body 310, so that the distal end of the first arm portion 321 is clamped in the first annular groove 151.

[0093] Figure 8 This is a schematic diagram of a partial structural cross-section of the first tissue traction device 10 provided in this embodiment when the clamp body 400 is in a clamped and locked state at a second viewing angle. Figure 2 , Figure 3 , Figure 5 and Figure 6 In this embodiment, the support arm 320 also includes a third arm portion 323 arranged at the proximal end of the second arm portion 322, the second connecting structure includes a limiting notch 324 opened at the proximal end of the third arm portion 323, and the first connecting structure includes a limiting protrusion 430 arranged on the clamp body 400. When the clamp body 400 is in a clamping and locking state, the limiting protrusion 430 is inserted into the limiting notch 324 to limit the clamp body 400 from sliding toward the distal end relative to the clamp base 300.

[0094] Optionally, the seat body 310 is further provided with a slide groove 312, and the clamp body 400 is provided with a first sliding protrusion 440 that slides with the slide groove 312. Specifically, the second connection structure also includes a proximal end of the slide groove 312, and the first connection structure also includes a first sliding protrusion 440. When the clamp body 400 is in a clamping and locking state, the first sliding protrusion 440 abuts against the proximal wall of the slide groove 312 to limit the clamp body 400 from sliding toward the proximal end relative to the clamp seat 300. In this way, the clamp body 400 is kept in a clamping and locking state through the limiting action between the first sliding protrusion 440 and the limiting protrusion 430 and the clamp seat 300, thereby ensuring that the clamp body 400 always clamps the tissue when being pulled by the outer tube assembly 100.

[0095] Specifically, there are two support arms 320, which are arranged opposite to each other along the radial direction of the seat body 310. Accordingly, there are two limiting notches 324, and there are two limiting protrusions 430 arranged on the clamp body 400. There are two slide grooves 312 arranged on the seat body 310, which are arranged opposite to each other along the radial direction of the seat body 310. Accordingly, there are two first sliding protrusions 440. The slide groove 312 extends along the axial direction of the seat body 310, so that when the first sliding protrusion 440 slides in the slide groove 312, the clamp body 400 switches between an open state, a closed state, and a locked state. Optionally, along the circumference of the seat body 310, the support arms 320 and the slide groove 312 are alternately arranged, and accordingly, the first sliding protrusion 440 and the limiting protrusion 430 are alternately arranged along the circumference of the seat body 310. It is understandable that in other embodiments, the number of supporting arms 320 and sliding slots 312 may be set according to needs.

[0096] Fig. 9 This is a schematic diagram of the structure of the first clamp 400 provided in this embodiment. Figure 1-Figure 9 In this embodiment, the clamp body 400 includes at least two clamp arms, which are arranged around the axis of the clamp seat 300, and when the clamp arm slides relative to the clamp seat 300 in the direction from the distal end to the proximal end, the clamp arm contacts the clamp seat 300, so that the clamp arm has a tendency to be relatively closed. Specifically, there are two clamp arms, which are respectively a first clamp arm 410 and a second clamp arm 420. The proximal end of the first clamp arm 410 is connected to the proximal end of the second clamp arm 420, and the distal end of the first clamp arm 410 is separated from the distal end of the second clamp arm 420. When the distal end of the first clamp arm 410 is away from the distal end of the second clamp arm 420, the clamp body 400 is in an open state. When the distal end of the first clamp arm 410 is close to or contacts the distal end of the second clamp arm 420, the clamp body 400 is in a closed state, and at this time, the tissue can be clamped between the distal end of the first clamp arm 410 and the distal end of the second clamp arm 420.

[0097] It should be noted that in the present embodiment, the number of the clamping arms is two. It is understandable that in other embodiments, the number of the clamping arms may be set as required, for example, the number of the clamping arms may be set to three or four.

[0098] Optionally, the clamp arm includes a connecting portion 481, an intermediate portion 482 and a clamping portion 483 connected in sequence, the clamping portion 483 is used to clamp tissue, and the connecting portions 481 of at least two clamp arms are connected to each other. The intermediate portion 482 is used to contact the clamp seat 300, so that when the clamp arm slides relative to the clamp seat 300 from the distal end to the proximal end, the clamp arm has a tendency to close. Specifically, the connecting portion 481 of the first clamp arm 410 is connected to the connecting portion 481 of the second clamp arm 420, so that the two clamp arms are connected to form a clamp body 400. When the clamp arm slides relative to the clamp seat 300 in the direction from the distal end to the proximal end, the position where the middle portion 482 contacts the clamp seat 300 gradually approaches the clamping portion 483, so that the angle between the middle portion 482 of the first clamp arm 410 and the middle portion 482 of the second clamp arm 420 is reduced, and then the distance between the clamping portion 483 of the first clamp arm 410 and the clamping portion 483 of the second clamp arm 420 is reduced, and the clamp arm has a tendency to switch from an open state to a closed state.

[0099] Optionally, the middle portion 482 is elastic, and when the clamp arm slides relative to the clamp seat 300 in the direction from the proximal end to the distal end, the middle portion 482 causes the clamp arm to have a tendency to open. Specifically, when the clamp arm slides relative to the clamp seat 300 in the direction from the distal end to the proximal end, the middle portion 482 is resisted by the clamp seat 300 and moves in the radial inward direction, so that the distance between the two clamping portions 483 is reduced; when the clamp arm slides relative to the clamp seat 300 in the direction from the proximal end to the distal end, the position where the middle portion 482 resists the clamp seat 300 gradually approaches the connecting portion 481, and the clamping portion 483 opens under the action of the elastic restoring force of the middle portion 482, and the distance between the two clamping portions 483 increases. It can be understood that in other embodiments, a pull rope wrapped around the clamp arm can be provided, and the pull rope can be pulled by the pull rope assembly 200 to manipulate the clamp arm to open or close (such as Fig.10 shown).

[0100] Optionally, the first clamp arm 410 and the second clamp arm 420 are made in one piece. In other words, the connecting portion 481 of the first clamp arm 410 and the connecting portion 481 of the second clamp arm 420 are made in one piece by bending, so that the first clamp arm 410 is connected to the second clamp arm 420. Specifically, two first sliding protrusions 440 are respectively provided on the first clamp arm 410 and the second clamp arm 420, and the first sliding protrusions 440 are formed by folding outwardly a part of the clamp arm. Two limiting protrusions 430 are respectively provided on both sides of the connection between the first clamp arm 410 and the second clamp arm 420, so that the limiting protrusions 430 and the clamp arms are alternately distributed in the circumferential direction of the clamp seat 300.

[0101] It should be noted that, in the present embodiment, the first clamp arm 410 and the second clamp arm 420 are made in one piece. It is understandable that in other embodiments, the connection method of the first clamp arm 410 and the second clamp arm 420 can also be set according to needs. For example, two separate clamp arms are pre-made, and then the connection between the connecting portion 481 of the first clamp arm 410 and the connecting portion 481 of the second clamp arm 420 is achieved by welding (such as Fig.11 shown).

[0102] It should also be noted that, in the present embodiment, the first clamp arm 410 and the second clamp arm 420 are directly connected to form the clamp body 400. It is understandable that, in other embodiments, the clamp body 400 may also be configured to include a connecting piece 450, and the connecting portions 481 of at least two clamp arms are respectively connected to the connecting piece 450, thereby realizing the connection of the proximal ends of at least two clamp arms.

[0103] As an example, Fig.12 FIG. 4 is a schematic diagram showing the structure of the fourth clamping body 400 provided in this embodiment. Fig.12 The connecting member 450 in the fourth clamp body 400 has at least two connecting protrusions 451, and the connecting portion 481 is provided with a clamping hole 452. The clamping holes 452 of at least two clamp arms correspond one-to-one to the at least two connecting protrusions 451, thereby realizing the connection of at least two clamp arms.

[0104] Fig.13 This is a schematic diagram of the structure of the tissue traction device provided in this embodiment after the cable assembly 200 and the clamp body 400 are separated. Fig.13 Combined with reference Figure 1-Figure 9 In this embodiment, the distal end of the cable assembly 200 is detachably connected to the clamp body 400, and when the tension applied to the distal end of the cable assembly 200 reaches a preset value, the distal end of the cable assembly 200 is separated from the clamp body 400. That is, during use, the clamp body 400 is driven to slide relative to the clamp seat 300 by pushing and pulling the cable assembly 200, so that the clamp body 400 switches between an open state and a closed state. At the same time, after the cable assembly 200 is pulled to drive the clamp body 400 to switch from an open state to a closed state, the cable assembly 200 is continued to be pulled to move the clamp body 400 toward the proximal end, the first connection structure cooperates with the second connection structure, and the clamp body 400 is in a clamping and locking state. At this time, the clamp body 400 is fixed relative to the clamp seat 300. When the tension applied to the distal end of the cable assembly 200 reaches a preset value, the distal end of the cable assembly 200 is separated from the clamp body 400.

[0105] It should be noted that, in the present embodiment, the distal end of the cable assembly 200 is detachably connected to the clamp body 400 . It is understandable that, in other embodiments, the distal end of the cable assembly 200 may also be configured to be fixedly connected to the clamp body 400 .

[0106] Optionally, a connecting hole 470 is provided on the clamp body 400, and the axis of the connecting hole 470 extends along the line connecting the proximal end and the distal end of the clamp body 400, that is, the first direction or the second direction. The distal end of the cable assembly 200 has a clamping groove 221 arranged along the circumference of the cable assembly 200, and the connecting hole 470 is penetrated at the distal end of the cable assembly 200, and the frame is clamped in the clamping groove 221. When the tension applied to the distal end of the cable assembly 200 reaches a preset value, the distal end of the cable assembly 200 is disengaged from the connecting hole 470, so that the cable assembly 200 is disengaged from the clamp body 400.

[0107] Specifically, the cable assembly 200 includes a cable 210 and a release member 220 connected to the distal end of the cable 210, and the release member 220 is located at the distal end of the cable assembly 200. The release member 220 is connected to the clamp body 400, and when the tension applied to the release member 220 reaches a preset value, the release member 220 is separated from the clamp body 400. The connecting hole 470 is provided at the connection between the first clamp arm 410 and the second clamp arm 420. The outer peripheral wall of the distal end of the release member 220 is recessed inward to form a clamping groove 221, that is, the outer diameter of the portion of the release member 220 located at the proximal end of the clamping groove 221 and the outer diameter of the portion of the release member 220 located at the distal end of the clamping groove 221 are both larger than the radial dimension of the clamping groove 221. When the clamp body 400 is clamped in the clamping slot 221, the portion of the release member 220 located at the proximal end of the clamping slot 221 is located at the proximal side of the connecting hole 470, and the portion of the release member 220 located at the distal end of the clamping slot 221 is located at the distal side of the connecting hole 470, thereby realizing the connection between the release member 220 and the frame. At the same time, when the pulling force applied to the release member 220 is greater than a preset value, the portion of the release member 220 located at the distal end of the clamping slot 221 and / or the clamp body 400 where the connecting hole 470 is opened are deformed, so that the portion of the release member 220 located at the distal end of the clamping slot 221 is disengaged from the connecting hole 470, thereby separating the cable assembly 200 from the clamp body 400.

[0108] It should be noted that the connection method between the distal end of the cable assembly 200 and the clamp body 400 is not limited here. It is understandable that in other embodiments, the structure of the release member 220 can also be set according to needs, for example Fig.11 In the structure shown, a hook hole 490 is provided at the proximal end of the clamp body 400, and the distal end of the cable assembly 200 is hooked with the hook hole 490, and when the tension applied to the distal end of the cable assembly 200 reaches a preset value, the distal end of the cable assembly 200 is separated from the hook hole 490. Specifically, the axis of the hook hole 490 extends along the radial direction of the clamp seat 300, and the release member 220 is a hook-shaped member formed by bending multiple sections. The release member 220 is hooked with the hook hole 490, and when the tension applied to the release member 220 reaches a preset value, the release member 220 is deformed to straighten the portion hooked with the hook hole 490, and then separates from the hook hole 490, thereby realizing the separation of the cable assembly 200 from the clamp body 400.

[0109] Or Fig.12 In the structure shown, the distal end of the cable assembly 200 has a clamping gap and a connecting groove 223. When the tension applied to the distal end of the cable assembly 200 reaches a preset value, the connecting member 450 is disengaged from the connecting groove 223, and the connecting portion 481 is disengaged from the clamping gap, and the distal end of the connecting portion 481 expands outward to engage with the clamp seat 300. Specifically, a through hole is provided on the clamp seat 300, and a clamping gap and a connecting groove 223 are provided on the release member 220. The connecting groove 223 is a spherical groove with a smaller opening. When the connecting member 450 is connected to the connecting groove 223, the connecting portion 481 of the clamp arm is clamped in the clamping gap. When the tension applied to the release member 220 is greater than the preset value, the connecting member 450 is disengaged from the connecting groove 223, and the connecting portion 481 of the clamp arm is disengaged from the clamping gap, and expands outward under the action of its own elastic restoring force to engage with the through hole on the clamp seat 300, so that the clamp body 400 is kept in a clamped and locked state.

[0110] Please continue to refer to Figure 1-Figure 9 In this embodiment, the tissue traction device 10 further includes a fitting member 600 disposed in the support cap 140, and the fitting member 600 has a passage for the release member 220 to pass through. The release member 220 has a fitting portion 222, and the fitting portion 222 is located on the proximal side of the slot 221. Specifically, the concave surface of the outer peripheral surface of the fitting portion 222, that is, along the direction from the proximal end to the distal end, the outer diameter of the fitting portion 222 first decreases and then increases. When the clamp body 400 is in a closed state, the portion of the release member 220 located on the proximal side of the fitting portion 222 passes through the passage of the fitting member 600, and when the clamp body 400 is in a clamped and locked state, the fitting portion 222 passes through the passage of the fitting member 600.

[0111] According to a tissue traction device 10 provided in this embodiment, the working principle of the tissue traction device 10 is as follows:

[0112] The distal end of the tissue traction device 10 penetrates the endoscope clamp channel from the proximal end of the endoscope and extends into the human body along the endoscope clamp channel. The clamp body 400 of the tissue traction device 10 extends out of the endoscope from the distal end opening of the endoscope clamp channel to clamp the tissue. When clamping, the clamp body 400 is first in an open state, and then the clamp body 400 is manipulated to rotate through the cable assembly 200 by rotating the handle 500 to adjust the relative angle between the clamp body 400 and the tissue to be clamped, so as to better clamp. After rotating to a suitable angle, the second handle 520 slides proximally relative to the first handle 510 to pull the cable assembly 200, thereby manipulating the clamp body 400 to switch to a closed state to clamp the tissue. If the clamping is accurate, the cable assembly 200 is further pulled to switch the clamp body 400 to a clamping locking state and separate the cable assembly 200 from the clamp body 400. If the clamping accuracy is poor, the second handle 520 is pushed to slide distally relative to the first handle 510 to push the cable assembly 200 to manipulate the clamp body 400 to switch to an open state. The clamping operation can be repeated until the clamping is accurate.

[0113] After the clamp body 400 is switched to the clamping and locking state and the cable assembly 200 is disengaged from the clamp body 400, the distal end of the outer tube assembly 100 remains connected to the clamp seat 300, and the proximal end of the outer tube assembly 100 is disengaged from the first handle 510. The first handle 510, the second handle 520 and the cable assembly 200 can be separated from the pulling structure to allow the endoscope to be smoothly withdrawn. At this time, the clamp body 400 is located inside the human body and stably clamps the tissue, and the proximal end of the outer tube assembly 100 is located outside the human body. Therefore, during surgical operations, the clamp body 400 can be manipulated by pushing and pulling the proximal end of the outer tube assembly 100 outside the body, thereby achieving tissue traction to improve the surgical field of view.

[0114] Fig.14 FIG. 1 is a schematic diagram showing a partial structural cross-section of a second tissue traction device 10 provided in this embodiment. Fig.14 The second tissue traction device 10 is substantially the same as the first tissue traction device 10 provided in this embodiment, except for the structure of the clamp body 400 , the structure of the clamp seat 300 and the structure of the release member 220 .

[0115] Specifically, in the second tissue traction device 10, a second annular groove 350 is provided on the outer peripheral wall of the clamp seat 300, and a sliding protrusion is provided on the inner peripheral wall of the support cap 140. The sliding protrusion is a second sliding protrusion 152. The second sliding protrusion 152 cooperates with the second annular groove 350 to enable the support cap 140 to be rotatably connected to the clamp seat 300.

[0116] Optionally, the clamp seat 300 includes a seat body 310 and an insert 330, the distal end of the insert 330 is embedded in the proximal end of the seat body 310, the proximal end of the outer peripheral wall of the insert 330 is provided with a step portion 331, and a second annular groove 350 is formed between the step portion 331 and the proximal end surface of the seat body 310. Specifically, the insert 330 is a circular tubular member, the inner peripheral wall of which is a smooth cylindrical surface, and the outer peripheral wall of which includes a first outer wall and a second outer wall arranged along the axial direction, the first outer wall is located at the proximal end of the insert 330, and the radial dimension of the first outer wall is greater than the radial dimension of the second outer wall, so that the step portion 331 is formed at the proximal end of the insert 330 by the first outer wall and the second outer wall, and the step portion 331, the second outer wall and the proximal end surface of the seat body 310 form the second annular groove 350. The second sliding protrusion 152 is disposed at the inner circumferential wall of the distal end of the support cap 140 . In other words, the second sliding protrusion 152 is formed by the distal end of the inner circumferential wall of the support cap 140 protruding radially inward.

[0117] In the second tissue traction device 10 provided in this embodiment, there are two clamp arms, which are respectively a first clamp arm 410 and a second clamp arm 420. The proximal end of the first clamp arm 410 and the proximal end of the second clamp arm 420 are rotatably connected, and the proximal end of the first clamp arm 410 and / or the proximal end of the second clamp arm 420 are connected to the cable assembly 200. The first clamp arm 410 is provided with a first slide groove 411, the second clamp arm 420 is provided with a second slide groove 421, and the clamp seat 300 is provided with a fixed shaft 340, and the fixed shaft 340 is penetrated by the first slide groove 411 and the second slide groove 421 at the same time. In this way, when the cable assembly 200 pushes and pulls the clamp body 400, the first clamp arm 410 and the second clamp arm 420 slide along the first slide groove 411 and the second slide groove 421 relative to the fixed shaft 340, respectively, that is, the first clamp arm 410 slides along the first slide groove 411 relative to the fixed shaft 340, and the second clamp arm 420 slides along the second slide groove 421 relative to the fixed shaft 340. The first slide groove 411 and the second slide groove 421 are arc grooves arranged in opposite directions, so that the first clamp arm 410 and the second clamp arm 420 can be opened or closed. Optionally, the distal ends of the first slide groove 411 and the second slide groove 421 are provided with a bending structure, and when the clamp body 400 is in a clamped and locked state, the fixing pin is located in the bending structure.

[0118] The first connection structure includes a hook structure 412 disposed on the first clamp arm 410 and the second clamp arm 420, and the second connection structure includes a hook 360 disposed on the clamp seat 300. When the clamp body 400 is in a clamping and locking state, the hook structure 412 is engaged with the hook 360, so that the clamp body 400 is kept in a clamping and locking state to ensure clamping stability. Specifically, the hook structure 412 is disposed on both the first clamp arm 410 and the second clamp arm 420, and when the clamp body 400 is in a closed state, the two hook structures 412 overlap, so that when the clamp body 400 is in a clamping and locking state, the two hook structures 412 are simultaneously engaged with the same hook 360. It can be understood that in other embodiments, two hooks 360 can also be disposed on the clamp seat 300, and the hook structures 412 of the two clamp arms are respectively engaged with the two hooks 360.

[0119] Optionally, the clamp body 400 further includes a connecting shaft 460, and the proximal end of the first clamp arm 410 and the proximal end of the second clamp arm 420 are rotatably connected via the connecting shaft 460. The distal end of the cable assembly 200 is sleeved with the connecting shaft 460, and the distal end of the cable assembly 200 has a notch, which is a second notch, so that when the tension applied to the distal end of the cable assembly 200 reaches a preset value, the connecting shaft 460 is disengaged from the second notch, so that the distal end of the cable assembly 200 is separated from the clamp body 400.

[0120] Optionally, the distal end of the cable assembly 200 is provided with a wire buckle 224, the wire buckle 224 is sleeved with a connecting shaft 460, and when the tension applied to the wire buckle 224 reaches a preset value, the wire buckle 224 is deformed to enlarge the second notch, and the connecting shaft 460 is now separated from the wire buckle 224 at the second notch, so that the cable assembly 200 is separated from the clamp body 400. Specifically, the wire buckle 224 is a fan-shaped structure with a notch formed by winding a steel wire.

[0121] It should be noted that the structure of the distal end of the cable assembly 200 is not limited here. It is understandable that in other embodiments, the structure of the distal end of the cable assembly 200 can also be set according to requirements. As an example, Fig.15 The embodiment provides a partial structural diagram of another cable assembly 200. Fig.15 The distal end of the cable assembly 200 includes a first clamping arm 225 and a second clamping arm 226 that are mutually arranged. A through hole for clamping the connecting shaft 460 and a notch communicating with the through hole are formed between the first clamping arm 225 and the second clamping arm 226, and the notch is a third notch. Specifically, the proximal ends of the first clamping arm 225 and the second clamping arm 226 are both connected to the cable 210, the distal ends of the first clamping arm 225 and the distal ends of the second clamping arm 226 are spaced apart to form the third notch, and the middle portion of the first clamping arm 225 and the middle portion of the second clamping arm 226 are spaced apart to form a through hole for clamping the connecting shaft 460.

[0122] Further, the two ends of the connecting shaft 460 extend out of the first clamp arm 410 and the second clamp arm 420 respectively, that is, the two ends of the connecting shaft 460 in the axial direction are respectively located on the side of the first clamp arm 410 away from the second clamp arm 420 and the side of the second clamp arm 420 away from the first clamp arm 410. The distal end of the cable assembly 200 includes two release parts, the two release parts are respectively the first release part and the second release part, the first release part and the second release part are respectively sleeved on the two ends of the connecting shaft 460, and the first clamp arm 410 and the second clamp arm 420 are located between the first release part and the second release part. Specifically, the release part is a steel wire buckle 224, that is, in this embodiment, the number of steel wire buckles 224 is two. Similarly, in other embodiments, the release part can also be set to include a structure of a first clamp arm 225 and a second clamp arm 226. In other words, in other embodiments, the number of the first clamp arm 225 and the second clamp arm 226 are respectively two.

[0123] The tissue traction device 10 provided in this embodiment has at least the following advantages:

[0124] The tissue traction device 10 provided by the embodiment of the present invention is configured such that the outer tube assembly 100 and the clamp seat 300 remain connected when the clamp body 400 is in a clamped and locked state, so that during surgery, the clamp body 400 can be manipulated to pull tissue by pushing and pulling the outer tube assembly 100, thereby obtaining a good surgical field of view, helping to shorten the surgical time and reduce surgical risks. At the same time, before the clamp body 400 is switched to the clamped and locked state, the clamp body 400 can be repeatedly opened and closed, or the clamp body 400 can be manipulated to rotate by the cable assembly 200 to ensure accurate clamping.

[0125] This embodiment also provides a method for using the tissue traction device 10, which can be implemented by the above-mentioned tissue traction device 10. Specifically, the method for using the tissue traction device 10 includes:

[0126] S01: Send the distal end of the tissue traction device 10 into the body along the forceps channel of the endoscope.

[0127] The distal end of the tissue traction device 10 is sent into the body along the forceps channel of the endoscope, and the clamp body 400 of the tissue traction device 10 is extended from the distal end opening of the forceps channel to clamp the tissue.

[0128] SO2: Operate the handle 500 of the tissue traction device 10 to enable the clamp body 400 of the tissue traction device 10 to clamp the tissue and switch the clamp body 400 to a clamping and locking state.

[0129] The handle 500 of the tissue traction device 10 is operated to drive the cable assembly 200 to move, so as to manipulate the clamp body 400 to clamp the tissue through the cable assembly 200. Specifically, before clamping, the handle 500 can be used to drive the clamp body 400 to rotate through the cable assembly 200 to adjust the clamping angle. After the angle adjustment is completed, the cable assembly 200 is pulled by the handle 500 to operate the clamp body 400 to switch to the closed state, so as to clamp the tissue. After accurate clamping, the cable assembly 200 is continued to be pulled to switch the clamp body 400 to the clamping locking state, and sufficient tension is continued to be applied to the cable assembly 200 to separate the distal end of the cable assembly 200 from the clamp body 400.

[0130] S03 : Disconnect the handle 500 from the outer tube assembly 100 of the tissue traction device 10 .

[0131] The distal end of the outer tube assembly 100 is detachably connected to the handle 500, so that the handle 500 can be separated from the outer tube assembly 100 by removing the distal end of the outer tube assembly 100 from the handle 500. It can be understood that in other embodiments, the distal end of the outer tube assembly 100 can also be cut off to separate the outer tube assembly 100 from the handle 500.

[0132] It should be noted that, in the present embodiment, the distal end of the cable assembly 200 can be detached from the clamp body 400. Therefore, even if the proximal end of the cable assembly 200 is connected to the handle 500, the clamp body 400 and the outer tube assembly 100 can be completely detached from the handle 500. It can be understood that in other embodiments, for example, when the distal end of the outer tube assembly 100 is cut off to achieve the detachment of the outer tube assembly 100 from the handle 500, the proximal end of the cable assembly 200 can also be cut off synchronously.

[0133] S04: The endoscope is withdrawn, the clamp body 400 remains connected to the outer tube assembly 100, and the proximal end of the outer tube assembly 100 is located outside the body, so that the clamp body 400 is driven by the outer tube assembly 100 to pull the tissue.

[0134] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A tissue traction device, the distal end of which is used to extend into the body through the forceps channel of an endoscope, characterized in that: include: Outer tube assembly (100); A clamping seat (300), the clamping seat (300) being connected to the distal end of the outer tube assembly (100); A clamp body (400), the clamp body (400) is used to clamp tissue, and the clamp body (400) can movably cooperate with the clamp seat (300); a first connecting structure is provided on the clamp body (400), and a second connecting structure is provided on the clamp seat (300), and the first connecting structure is used to connect with the second connecting structure so that the clamp body (400) is in a clamped and locked state; as well as A cable assembly (200), the cable assembly (200) passing through the outer tube assembly (100), the distal end of the cable assembly (200) being connected to the clamping body (400) so as to manipulate the clamping body (400) through the cable assembly (200); Wherein, the outer tube assembly (100) is used to maintain connection with the clamp seat (300) when the clamp body (400) is in the clamping and locking state, so as to manipulate the clamp body (400) to pull the tissue; A support cap (140) is provided at the distal end of the outer tube assembly (100), and the clamp seat (300) is rotatably connected to the support cap (140) so as to drive the clamp body (400) to rotate by the rotation of the cable assembly (200) relative to the outer tube assembly (100); The inner peripheral wall of the support cap (140) is provided with a first annular groove (151); the clamp seat (300) comprises a seat body (310) and a support arm (320) arranged on the seat body (310); one end of the support arm (320) extends out of the outer peripheral wall of the seat body (310) and is clamped in the first annular groove (151), so that when the support arm (320) rotates along the first annular groove (151), the clamp seat (300) rotates relative to the support cap (140); and when the clamp body (400) is in the clamping and locking state, one end of the support arm (320) is clamped in the first annular groove (151), so that the clamp seat (300) and the support cap (140) remain connected; The tissue traction device (10) further comprises a first handle (510) and a second handle (520) which are slidably connected to each other, the proximal end of the outer tube assembly (100) is detachably connected to the first handle (510), and the proximal end of the cable assembly (200) is connected to the second handle (520), so that when the first handle (510) and the second handle (520) slide relative to each other, the cable assembly (200) moves relative to the outer tube assembly (100); When the clamp body (400) is switched to the clamping and locking state, the first handle (510) can be detached from the outer tube assembly (100); when the clamp body (400) and the outer tube assembly (100) remain connected and the proximal end of the outer tube assembly (100) is located outside the body, the outer tube assembly (100) is used to drive the clamp body (400) to pull the tissue.

2. The tissue traction device according to claim 1, characterized in that: The proximal end of the outer tube assembly (100) is provided with a snap-fitting protrusion, and the first handle (510) is provided with a snap-fitting groove (511), and the snap-fitting groove (511) is snap-fitted with the snap-fitting protrusion; Alternatively, the proximal end of the outer tube assembly (100) is threadedly connected to the first handle (510); Alternatively, a breakable portion is provided at the proximal end of the outer tube assembly (100), and the breakable portion is used to break to disengage the outer tube assembly (100) from the first handle (510).

3. The tissue traction device according to claim 2, characterized in that: The outer tube assembly (100) comprises a spring tube (110), a connecting tube (120) and a fixing tube (130) which are connected in sequence; the fixing tube (130) is connected to the proximal end of the connecting tube (120), and the outer diameter of the fixing tube (130) is greater than the outer diameter of the connecting tube (120) to form the clamping protrusion; the first handle (510) is provided with a groove (512) which is in communication with the clamping groove (511); the connecting tube (120) is accommodated in the groove (512), and the distal end of the connecting tube (120) extends outside the groove (512) to be connected to the proximal end of the spring tube (110); the distal end of the spring tube (110) is connected to the clamping seat (300).

4. The tissue traction device according to claim 1, characterized in that: The support arm (320) is arranged obliquely relative to the axis of the seat body (310), and the proximal end of the support arm (320) is located inside the seat body (310), and the distal end of the support arm (320) is located outside the seat body (310), so that the distal end of the support arm (320) protrudes from the outer peripheral wall of the seat body (310) and is inserted into the first annular groove (151).

5. The tissue traction device according to claim 4, characterized in that: The support arm (320) comprises a first arm portion (321) and a second arm portion (322) which are connected to each other; the first arm portion (321) and the second arm portion (322) are respectively arranged to be inclined relative to the axis of the seat body (310), and the angle between the first arm portion (321) and the axis is greater than the angle between the second arm portion (322) and the axis; the second arm portion (322) is connected to the seat body (310), the first arm portion (321) is located at the distal end of the second arm portion (322), and the distal end of the first arm portion (321) is clamped in the first annular groove (151).

6. The tissue traction device according to claim 5, characterized in that: The support arm (320) further comprises a third arm portion (323) arranged at the proximal end of the second arm portion (322); the second connection structure comprises a limiting notch (324) arranged at the proximal end of the third arm portion (323); the first connection structure comprises a limiting protrusion (430) arranged on the clamp body (400); when the clamp body (400) is in the clamping and locking state, the limiting protrusion (430) is engaged with the limiting notch (324) to limit the clamp body (400) from sliding toward the distal end relative to the clamp seat (300).

7. The tissue traction device according to claim 6, characterized in that: The seat body (310) is also provided with a slide groove (312), the second connection structure includes a proximal wall surface of the slide groove (312), and the first connection structure includes a first sliding protrusion (440) arranged on the clamp body (400), the first sliding protrusion (440) is slidably matched with the slide groove (312), and when the clamp body (400) is in the clamping and locking state, the first sliding protrusion (440) contacts the proximal wall surface to limit the clamp body (400) from sliding toward the proximal end relative to the clamp seat (300).

8. The tissue traction device according to claim 5, characterized in that: When the clamping body (400) is in an open state, the angle formed between the first arm portion (321) and the axis of the seat body (310) is α, and the angle formed between the second arm portion (322) and the axis of the seat body (310) is β; 20°≤α≤80°, 0°≤β≤60°.

9. The tissue traction device according to claim 1, characterized in that: The inner peripheral wall of the support cap (140) is provided with a second sliding protrusion (152), the outer peripheral wall of the clamp seat (300) is provided with a second annular groove (350), and the second sliding protrusion (152) cooperates with the second annular groove (350) to enable the support cap (140) to be rotatably connected to the clamp seat (300).

10. The tissue traction device according to claim 9, characterized in that: The clamp seat (300) comprises a seat body (310) and an insert (330), wherein the distal end of the insert (330) is embedded in the proximal end of the seat body (310), and a step portion (331) is provided at the proximal end of the outer peripheral wall of the insert (330), and the step portion (331) and the proximal end surface of the seat body (310) form the second annular groove (350).

11. The tissue traction device according to claim 1, characterized in that: The clamp body (400) comprises a first clamp arm (410) and a second clamp arm (420), the proximal end of the first clamp arm (410) and the proximal end of the second clamp arm (420) are rotatably connected, and the proximal end of the first clamp arm (410) and / or the proximal end of the second clamp arm (420) are connected to the cable assembly (200); a first slide groove (411) is provided on the first clamp arm (410), and a second slide groove (421) is provided on the second clamp arm (420); a fixed shaft (340) is provided on the clamp seat (300), and the fixed shaft (340) passes through the first slide groove (411) and the second slide groove (421); the first clamp arm (410) and the second clamp arm (420) slide along the first slide groove (411) and the second slide groove (421) respectively relative to the fixed shaft (340), so that the clamp body (400) switches between an open state and a closed state.

12. The tissue traction device according to claim 11, characterized in that: The first connection structure comprises a hook structure (412) provided on the first clamp arm (410) and the second clamp arm (420), and the second connection structure comprises a hook (360) provided on the clamp seat (300); when the clamp body (400) is in the clamping and locking state, the hook structure (412) is engaged with the hook (360).

13. The tissue traction device according to claim 11, characterized in that: The clamp body (400) further comprises a connecting shaft (460), and the proximal end of the first clamp arm (410) and the proximal end of the second clamp arm (420) are rotatably connected via the connecting shaft (460); the distal end of the cable assembly (200) is sleeved with the connecting shaft (460), and the distal end of the cable assembly (200) has a notch, so that when the tension applied to the distal end of the cable assembly (200) reaches a preset value, the connecting shaft (460) is disengaged from the notch, so that the distal end of the cable assembly (200) is detached from the clamp body (400).

14. The tissue traction device according to claim 13, characterized in that: The distal end of the cable assembly (200) is a steel wire buckle (224), the steel wire buckle (224) is sleeved with the connecting shaft (460), and when the tension applied to the steel wire buckle (224) reaches a preset value, the steel wire buckle (224) deforms to enlarge the notch, and the connecting shaft (460) is separated from the steel wire buckle (224) from the notch.

15. The tissue traction device according to claim 13, characterized in that: The distal end of the cable assembly (200) comprises a first clamping arm (225) and a second clamping arm (226) which are arranged opposite to each other, and a through hole for clamping the connecting shaft (460) and a notch communicating with the through hole are formed between the first clamping arm (225) and the second clamping arm (226).

16. The tissue pulling device according to claim 13, characterized in that: The first clamp arm (410) and the second clamp arm (420) extend out from both ends of the connecting shaft (460), respectively; the distal end of the cable assembly (200) comprises a first release portion and a second release portion, the first release portion and the second release portion are respectively sleeved on both ends of the connecting shaft (460), and the first clamp arm (410) and the second clamp arm (420) are clamped between the first release portion and the second release portion.

17. The tissue pulling device according to claim 1, characterized in that: The clamp body (400) comprises at least two clamp arms, and the at least two clamp arms are arranged around the axis of the clamp seat (300); the proximal ends of the at least two clamp arms are connected to each other, and when the clamp arms slide relative to the clamp seat (300) in a direction from the distal end to the proximal end, the clamp arms contact the clamp seat (300), so that the clamp arms have a tendency to close.

18. The tissue pulling device according to claim 17, characterized in that: The clamp arm comprises a connecting portion (481), an intermediate portion (482) and a clamping portion (483) which are connected in sequence, the clamping portion (483) being used to clamp the tissue, and the connecting portions (481) of the at least two clamp arms are connected to each other; the intermediate portion (482) is used to abut against the clamp seat (300) so that when the clamp arm slides relative to the clamp seat (300) in a direction from the distal end to the proximal end, the clamp arm has a tendency to close.

19. The tissue pulling device according to claim 18, characterized in that: The middle portion (482) is elastic, and when the clamp arm slides relative to the clamp seat (300) in a direction from the proximal end to the distal end, the middle portion (482) causes the clamp arm to have a tendency to open.

20. The tissue pulling device according to claim 18, characterized in that: The clamp body (400) further comprises a connecting piece (450), and the connecting portions (481) of the at least two clamp arms are respectively connected to the connecting piece (450); the connecting piece (450) is connected to the distal end of the cable assembly (200).

21. The tissue pulling device according to claim 20, characterized in that: The connecting member (450) has at least two connecting protrusions (451), the connecting portion (481) is provided with a clamping hole (452), and the clamping holes (452) of the at least two clamping arms are clamped with the at least two connecting protrusions (451) in a one-to-one correspondence; the distal end of the cable assembly (200) has a clamping gap and a connecting groove (223), the proximal end of the connecting portion (481) is clamped in the clamping gap, and the proximal end of the connecting member (450) is clamped in the connecting groove (223); when the tension applied to the distal end of the cable assembly (200) reaches a preset value, the connecting member (450) is disengaged from the connecting groove (223), and the connecting portion (481) is disengaged from the clamping gap, and the distal end of the connecting portion (481) expands outward to be clamped with the clamp seat (300).

22. The tissue pulling device according to claim 18, characterized in that: The connecting portion (481) of the at least two clamping arms is integrally formed.

23. The tissue pulling device according to claim 1, characterized in that: The distal end of the cable assembly (200) is detachably connected to the clamp body (400), and when the tension applied to the distal end of the cable assembly (200) reaches a preset value, the distal end of the cable assembly (200) is detached from the clamp body (400).

24. The tissue pulling device according to claim 23, characterized in that: The clamp body (400) is provided with a connecting hole (470), the axis of the connecting hole (470) extending in the direction of a line connecting the proximal end and the distal end of the clamp body (400), the distal end of the cable assembly (200) having a clamping groove (221) arranged along the circumference of the cable assembly (200), the distal end of the cable assembly (200) passing through the connecting hole (470), and the clamp body (400) being clamped in the clamping groove (221); when the tension applied to the distal end of the cable assembly (200) reaches a preset value, the distal end of the cable assembly (200) is disengaged from the connecting hole (470).

25. The tissue pulling device according to claim 23, characterized in that: A hook hole (490) is provided at the proximal end of the clamp body (400), and the distal end of the cable assembly (200) is hooked to the hook hole (490), and when the tension applied to the distal end of the cable assembly (200) reaches a preset value, the distal end of the cable assembly (200) is disengaged from the hook hole (490).

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