A hemostatic clip and auxiliary system

Abstract

The object of the present invention is to provide a hemostatic clip and an auxiliary system, comprising a first clip, a second clip, a tightening tube, an intermediate clip, a central axis assembly, a traction assembly, a control handle and at least two partitions, the traction assembly is respectively connected to the control handle and the central axis assembly, the central axis assembly is connected to the tightening tube, the proximal ends of the first clip and the second clip are connected to the traction assembly, the proximal end of the intermediate clip passes through the tightening tube and is fixedly connected to the central axis assembly, the first clip and the second clip are arranged on both sides of the intermediate clip, the first clip and the intermediate clip form a first clip, the second clip and the intermediate clip form a second clip, the control handle is used to open or close the first clip and the second clip corresponding to the first clip and / or the second clip, the partition is arranged in the tube cavity of the tightening tube, and is located between the first clip and the intermediate clip, and between the second clip and the intermediate clip, which can reduce the risk of device failure caused by interference between the first clip, the second clip and the intermediate clip.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a hemostatic clip and an auxiliary system. Background Art

[0002] With the development and application of digestive endoscopy diagnosis and treatment technology, the technology of minimally invasive treatment of various benign and malignant gastrointestinal lesions under endoscopy has also been promoted and applied. The safe and effective closure of gastrointestinal tissue defects / perforations during surgery is a key issue that must be solved. At present, the main endoscopic suturing instruments include hemostatic clips and endoscopic suturing devices.

[0003] The medical devices on the market used to close large or complex-shaped tissue defects or perforations include anastomotic clips and endoscopic staplers. However, the former is expensive and a permanent implant, while the latter is large in size, cumbersome to operate, has a limited field of view, and is also expensive. Neither of these two products has been widely promoted in China.

[0004] Compared with anastomotic clips and endoscopic staplers, hemostatic clips are widely used in closed treatment surgeries of large-area or complex-shaped tissue defects or perforations because of their detachable clamp heads, low prices, and easy operation. This hemostatic clip has three flaps, namely, a first flap, a second flap, and a middle flap. The first flap and the second flap can be opened or closed independently relative to the middle flap. During surgery, the first flap and the middle flap are first used to clamp one side of the tissue defect or perforation, and then the second flap and the middle flap are used to clamp the other side of the tissue defect or perforation, so that the entire tissue defect or perforation is closed. However, after the first and second flaps of this hemostatic clip are clamped in sequence, the first flap, the second flap, and the middle flap are prone to interference, resulting in the inability of the clamp head of the hemostatic clip to separate and fall off, causing instrument failure, affecting surgical efficiency, and seriously leading to surgical failure.

[0005] Therefore, there is an urgent need to improve the existing hemostatic clip to reduce the risk of interference between the first clip, the second clip and the middle clip, which may lead to device failure. Summary of the invention

[0006] The object of the present invention is to provide a hemostatic clip and an auxiliary system to reduce the interference among the first clip, the second clip and the middle clip, and reduce the risk of device failure.

[0007] In order to solve the above technical problems, the present invention provides a hemostatic clip, comprising a first clip, a second clip, a tightening tube, an intermediate clip, a central axis assembly, a traction assembly, a control handle and at least two separators, wherein the control handle is connected to the proximal end of the traction assembly, the distal end of the traction assembly is connected to the proximal end of the central axis assembly, the distal end of the central axis assembly is connected to the tightening tube, the proximal ends of the first clip and the second clip are arranged in the tightening tube, the proximal ends of the first clip and the second clip are connected to the traction assembly, the proximal end of the intermediate clip passes through the tightening tube and is fixedly connected to the central axis assembly, and the first clip and the first Two clips are arranged on both sides of the middle clip, the first clip and the middle clip form a clip, and the second clip and the middle clip form a clip, the control handle is used to control the first clip and the second clip to move back and forth in the tightening tube through the traction assembly, so that the distal ends of the first clip and / or the second clip are close to or away from the middle clip, thereby opening or closing the clips corresponding to the first clip and / or the second clip, and the separator is arranged in the tube cavity of the tightening tube, and is located between the first clip and the middle clip, and between the second clip and the middle clip.

[0008] Optionally, there are two separators, and the two separators are plate-shaped and arranged in parallel.

[0009] Optionally, a limiting groove is provided on the tightening tube, and the limiting groove cooperates with the proximal ends of the first clip and the second clip to limit the proximal movement of the first clip and the second clip relative to the tightening tube.

[0010] Optionally, a limiting protrusion is provided on a surface of the first clip and the second clip away from the tube wall of the tightening tube, and a blocking piece cooperating with the limiting protrusion is provided on the distal end surface of the tightening tube, and the blocking piece and the limiting protrusion cooperate with each other to limit the movement of the first clip and the second clip toward the proximal end of the tightening tube.

[0011] Optionally, the central axis assembly includes a sheath front end tube, a connecting piece and a pull ring, the proximal end of the sheath front end tube is connected to the traction assembly, and the distal end of the sheath front end tube is detachably connected to the tightening tube via the connecting piece, the traction assembly is used to drive the pull ring to move toward the distal end, and the pull ring separates the connecting piece from the tightening tube and the sheath front end tube during the process of moving toward the distal end, and the proximal end of the intermediate clip is arranged in the lumen of the sheath front end tube and is fixedly connected to the lumen of the sheath front end tube.

[0012] Optionally, the connecting piece is an elastic piece, and when the elastic piece is released, the connecting piece is connected to the tightening tube and the front end tube of the sheath tube; when the elastic piece is compressed, the connecting piece is separated from the tightening tube and the front end tube of the sheath tube.

[0013] Optionally, the proximal end of the tightening tube is arranged on the distal end of the front end tube of the sheath tube, two insertion holes are opened on the tightening tube, and a limiting hole corresponding to the insertion holes is opened on the front end tube of the sheath tube. The elastic member is a type of spring pin. When the spring pin is released, the two ends of the spring pin pass through the insertion hole and the limiting hole. When the spring pin is compressed, the two ends of the spring pin come out of the insertion hole and the limiting hole.

[0014] Optionally, the traction assembly includes a sheath, two core wires, two hooks and two connecting pins, the proximal end of the sheath is connected to the control handle, the distal end of the sheath is fixedly connected to the central axis assembly, the two core wires are arranged in the lumen of the sheath, the proximal end of the core wire is connected to the control handle, the distal end of the core wire is fixedly connected to the hooks, the two hooks are respectively connected to the first clip and the second clip through the connecting pins, and the control handle is used to pull the first clip and the second clip to reciprocate in the tightening tube through the two core wires.

[0015] Optionally, if the force applied to the connection between the hook and the connecting pin is greater than a preset force, the hook and the connecting pin are separated.

[0016] Optionally, a first pin hole corresponding to the hook is provided on the first clip, and a second pin hole corresponding to the hook is provided on the second clip. Before the connecting pin is connected to the hook and the first clip and the second clip, the connecting pin is tubular and has a plurality of cutting grooves formed on the connecting pin. The cutting grooves extend from both ends of the connecting pin to the middle part of the connecting pin. After the connecting pin is connected to the hook and the first clip and the second clip, the connecting pin passes through the first pin hole and the hook, and the outer diameters of the two ends of the connecting pin are greater than the outer diameter of the middle part of the connecting pin.

[0017] Optionally, the hook is in the shape of a sheet, a deformation groove is provided on the hook, and the connecting pin is arranged through the deformation groove.

[0018] Optionally, the sheath includes a first proximal sheath, a second proximal sheath, a distal sheath and a connecting tube, the proximal end of the connecting tube being fixedly connected to the distal ends of the first proximal sheath and the second proximal sheath, respectively, the distal end of the connecting tube being fixedly connected to the proximal end of the distal sheath, the distal end of the distal sheath being fixedly connected to the front end tube of the sheath, the proximal ends of the first proximal sheath and the second proximal sheath being fixedly connected to one of the control handles, respectively, and after the two core wires pass through the distal sheath and the connecting tube, they pass through the first proximal sheath and the second proximal sheath, respectively, and are connected to the control handle.

[0019] The present invention also provides an auxiliary system, comprising an endoscope and the above-mentioned hemostatic clip, wherein the endoscope is used for conveying and pulling the hemostatic clip.

[0020] The hemostatic clip and auxiliary system provided by the present invention have the following beneficial effects:

[0021] By arranging the partition in the tube cavity of the tightening tube and making the partition between the first clip and the middle clip, and the second clip and the middle clip, the first clip, the second clip and the middle clip can be separated from each other and not in direct contact, so that the first clip and the middle clip, and the second clip and the middle clip can be avoided from interfering with each other, so that it is convenient to control the first clip and the second clip to move back and forth in the tightening tube by the control handle, so that the first clip formed by the first clip and the middle clip is repeatedly opened and closed, and the second clip formed by the second clip and the middle clip is repeatedly opened and closed, and the middle clip is convenient to be pulled out from the first clip and the second clip, thereby reducing the risk of operating inconvenience caused by interference between the first clip, the second clip and the middle clip. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the structure of the hemostatic clip in the first embodiment of the present invention;

[0023] Figure 2 is a cross-sectional view of the first clamp, the second clamp, the tightening tube, the middle clamp and the central axis assembly in the first embodiment of the present invention;

[0024] Figure 3 is a cross-sectional view of the first clamp, the second clamp and the tightening tube in the first embodiment of the present invention;

[0025] Figure 4 is a schematic structural diagram of a tightening tube in Embodiment 1 of the present invention;

[0026] Figure 5 is a left side view of the tightening tube in the first embodiment of the present invention;

[0027] Figure 6 is a front view of the tightening tube in the first embodiment of the present invention;

[0028] Figure 7 is a schematic diagram of the structure in which the first clip, the second clip and the middle clip are closed in Embodiment 1 of the present invention;

[0029] Figure 8 is a cross-sectional view of a chuck and a central shaft assembly in Embodiment 1 of the present invention;

[0030] Fig. 9 It is a structural schematic diagram of a chuck and a central shaft assembly in Embodiment 1 of the present invention;

[0031] Fig.10 is another structural schematic diagram of the chuck and the middle shaft assembly in the first embodiment of the present invention;

[0032] Fig.11 is a schematic structural diagram of a central axis assembly in Embodiment 1 of the present invention;

[0033] Fig.12 is a structural schematic diagram of a traction assembly in Embodiment 1 of the present invention;

[0034] Fig.13 is a schematic structural diagram of a hook in Embodiment 1 of the present invention;

[0035] Fig.14 is a schematic structural diagram of a hook and a first clip in Embodiment 1 of the present invention;

[0036] Fig.15 is a schematic structural diagram of the connecting pin before the connecting pin is connected to the hook and one of the first clip or the second clip in the first embodiment;

[0037] Fig.16 is a schematic structural diagram of the connecting pin after the connecting pin is connected to the hook and one of the first clip or the second clip in the first embodiment;

[0038] Fig.17 is a schematic diagram of the structure of the control handle in the first embodiment;

[0039] Fig.18 is an exploded view of the control handle 180 in the first embodiment;

[0040] Fig.19 is a schematic structural diagram of the first clamp formed by the first clamp and the middle clamp in the first embodiment of the present invention after being closed;

[0041] Fig. 20 It is a schematic structural diagram of the first clamp formed by the first clamp and the middle clamp and the second clamp formed by the second clamp and the middle clamp in the first embodiment of the present invention after being closed;

[0042] Fig.21It is a schematic diagram of the structure of the hemostatic clip in the process of the hook being separated from the connecting pin and the tightening tube and the front end tube of the sheath tube being separated in the first embodiment of the present invention;

[0043] Fig. 22 It is a partial structural schematic diagram of the hemostatic clip in the process of the hook being separated from the connecting pin and the tightening tube and the front end tube of the sheath tube being separated in the first embodiment of the present invention;

[0044] Fig.23 It is another partial structural schematic diagram of the hemostatic clip in the process of the hook being separated from the connecting pin and the tightening tube and the front end tube of the sheath tube being separated in the first embodiment of the present invention;

[0045] Fig.24 is a schematic diagram of the structure of the hemostatic clip in the second embodiment;

[0046] Fig.25 is an axonometric view of the hemostatic clip in the second embodiment;

[0047] Fig.26 is a partial enlarged schematic diagram of the hemostatic clip in the second embodiment;

[0048] Fig. 27 is a schematic diagram of the structure of the hemostatic clip in the second embodiment;

[0049] Fig.28 is a schematic diagram of the structure of the first clamp formed by the first clamp and the middle clamp after being closed;

[0050] Fig.29 It is a schematic structural diagram of a first clamp formed by a first clamp and a middle clamp, and a second clamp formed by a second clamp and a middle clamp after being closed;

[0051] Fig.30 It is a schematic diagram of the structure after the chuck is separated from the middle shaft assembly, the traction assembly and the control handle.

[0052] Description of reference numerals:

[0053] 110-first clamping piece; 120-second clamping piece; 130-limiting protrusion; 140-tightening tube; 141-limiting groove; 142-blocking piece; 143-insertion hole; 150-middle clamping piece;

[0054] 160-middle axis assembly; 161-front end tube of sheath tube; 162-limiting hole; 163-connecting piece; 164-pull ring;

[0055] 170-traction assembly; 171-sheath; 171a-first proximal sheath; 171b-second proximal sheath; 171c-distal sheath; 172-connecting tube; 173-core wire; 174-hook; 175-deformation groove; 176-connecting pin; 177-cutting groove;

[0056] 180-control handle; 181-handle body; 182-handle pull ring; 183-limit buckle; 184-limit part; 185-limit tube; 186-limit buckle; 187-limit slot, 190-separator. DETAILED DESCRIPTION

[0057] The hemostatic clip and auxiliary system proposed by the present invention are further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the accompanying drawings are in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0058] Embodiment 1

[0059] This embodiment provides a hemostatic clip. Figure 1 and Figure 2 , Figure 1 is a schematic diagram of the structure of the hemostatic clip in the first embodiment of the present invention, Figure 2 1 is a cross-sectional view of the first clip 110, the second clip 120, the tightening tube 140, the middle clip 150 and the central axis assembly 160 in the first embodiment of the present invention. The hemostatic clip includes the first clip 110, the second clip 120, the tightening tube 140, the middle clip 150, the central axis assembly 160, the traction assembly 170 and the control handle 180. The control handle 180 is connected to the traction assembly 170, the distal end of the traction assembly 170 is connected to the proximal end of the central axis assembly 160, the distal end of the central axis assembly 160 is connected to the tightening tube 140, the proximal ends of the first clip 110 and the second clip 120 are arranged in the tightening tube 140, and the first clip 110 and the second clip 120 are arranged in the tightening tube 140. 0 and the proximal end of the second clip 120 are connected to the traction assembly 170, the proximal end of the middle clip 150 passes through the tightening tube 140 and is fixedly connected to the central axis assembly 160, the first clip 110 and the second clip 120 are arranged on both sides of the middle clip 150, the first clip 110 and the middle clip 150 form a first clip, and the second clip 120 and the middle clip 150 form a second clip, and the control handle 180 is used to control the first clip 110 and the second clip 120 to reciprocate in the tightening tube 140 through the traction assembly 170, so as to open or close the first clip and the second clip.

[0060] Specifically, the reciprocating movement of the first clamp 110 and the second clamp 120 in the tightening tube 140 means that the first clamp 110 and the second clamp 120 move from the proximal end to the distal end, or from the distal end to the proximal end in the tightening tube 140 .

[0061] When the first clip 110 moves distally in the tightening tube 140, the distal end of the first clip 110 moves away from the middle clip 150, so that the first clip 110 and the middle clip 150 form a first clamp open. When the first clip 110 moves proximally in the tightening tube 140, the distal end of the first clip 110 approaches the middle clip 150, so that the first clip 110 and the middle clip 150 form a first clamp closed. Similarly, when the second clip 120 moves toward the distal end in the tightening tube 140, the distal end of the second clip 120 can also be moved away from the middle clip 150, so that the second clip formed by the first clip 110 and the middle clip 150 is opened; when the second clip 120 moves toward the proximal end in the tightening tube 140, the distal end of the second clip 120 can also be moved close to the middle clip 150, so that the second clip formed by the second clip 120 and the middle clip 150 is closed. That is to say, in this embodiment, when any one of the first clip 110 and the second clip 120 moves toward the distal end in the tightening tube 140, the first clip and the second clip corresponding to the first clip 110 and the second clip 120 can be opened; when any one of the first clip 110 and the second clip 120 moves toward the proximal end in the tightening tube 140, the first clip 110 and the second clip 120 respectively formed with the middle clip 150 can be closed.

[0062] The middle clip 150 mainly plays a role of fixing and supporting.

[0063] refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 , Figure 3 is a cross-sectional view of the first clip 110, the second clip 120 and the tightening tube 140 in the first embodiment of the present invention, Figure 4 is a schematic structural diagram of the tightening tube 140 in the first embodiment of the present invention, Figure 5 1 is a left side view of the tightening tube 140 in the first embodiment of the present invention. Figure 6 It is a front view of the tightening tube 140 in the first embodiment of the present invention. The hemostatic clip also includes at least two partitions 190. The partitions 190 are arranged in the lumen of the tightening tube 140 and are located between the first clip 110 and the middle clip 150, and between the second clip 120 and the middle clip 150.

[0064] By arranging the separator 190 in the lumen of the tightening tube 140 and positioning the separator 190 between the first clip 110 and the middle clip 150, and between the second clip 120 and the middle clip 150, the first clip 110, the second clip 120 and the middle clip 150 can be separated from each other and not in direct contact. Thus, when the middle clip is pulled out, the situation in the prior art where the middle clip cannot be pulled out due to direct contact and mutual interference between the first clip and the second clip can be avoided, thereby The control handle 180 controls the first clamp 110 and the second clamp 120 to move back and forth in the tightening tube 140, so that the first clamp formed by the first clamp 110 and the middle clamp 150 is repeatedly opened and closed, and the second clamp formed by the second clamp 120 and the middle clamp 150 is repeatedly opened and closed, and the middle clamp 150 is easily withdrawn from the first clamp 110 and the second clamp 120, thereby reducing the interference between the first clamp 110, the second clamp 120 and the middle clamp 150.

[0065] Specifically, Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the number of the separators 190 is two, and both of the separators 190 are plate-shaped, and the two sides of the separators 190 are respectively fixedly connected to the tube wall of the tightening tube 140, and the two separators 190 are parallel to each other. In other embodiments, one side of each separator 190 is fixedly connected to the tube wall of the tightening tube 140, and the other side of the separator 190 is a free end. In other words, as long as the first clamp 110, the second clamp 120 and the middle clamp 150 are provided with a separator 190 that can completely separate the first clamp 110 from the middle clamp 150, and the second clamp 120 from the middle clamp 150, or partially separate them, it will be sufficient.

[0066] In other embodiments, the number of the separators 190 may be more than one. When the number of the separators 190 is four, the implementation method may be: one side of the separator 190 is fixedly connected to the tube wall of the tightening tube 140, the other side of the separator 190 is a free end, the free end of the separator 190 is not fixedly connected to the tube wall of the tightening tube, two separators 190 form a group to separate the first clip 110 from the middle clip 150, and another two separators 190 form a group to separate the second clip 120 from the middle clip 150. In this embodiment, the separator 190 is a plate-like rib or plate-like edge extending from the tube wall of the tightening tube 140 to the inside of the tube cavity and arranged along the axial direction of the tightening tube 140. For another example, when there are three separators 190, one side of each separator 190 is fixedly connected to the tube wall of the tightening tube 140, and the other side of the separator 190 is a free end, wherein two separators 190 form a group to separate the first clip 110 from the middle clip 150, and another separator 190 separates the second clip 120 from the middle clip 150, wherein the three separators 190 are all plate-like ribs or plate-like edges extending from the tube wall of the tightening tube 140 to the inside of the tube cavity and arranged along the axial direction of the tightening tube 140. Among the three separators 190, the two sides of the separator 190 used to separate the second clip 120 from the middle clip 150 can also be fixedly connected to the tube wall of the tightening tube 140 respectively.

[0067] In this embodiment, the separators 190 are all plate-shaped, and the two sides of the separators 190 are respectively fixedly connected to the tube wall of the tightening tube 140, so that the first clamp 110 and the middle clamp 150, and the second clamp 120 and the middle clamp 150 can be completely separated; one side of the separator 190 is fixedly connected to the tube wall of the tightening tube 140, and the other side of the separator 190 is a free end, so that the first clamp 110 and the middle clamp 150, and the second clamp 120 and the middle clamp 150 can be completely separated. The middle clip 150 is partially separated. Although the separator 190 fails to directly separate the first clip 110 from the middle clip 150, and the second clip 120 from the middle clip 150, the separator 190 has a certain thickness, and there is still a certain gap between the first clip 110 and the middle clip 150, and the second clip 120 and the middle clip 150. Therefore, interference between the first clip 110 and the middle clip 150, and the second clip 120 and the middle clip 150 can also be avoided.

[0068] The separator 190 is arranged along the axial direction of the tightening tube 140. A plurality of separators 190 may be arranged in sequence and at intervals along the axial direction of the tightening tube 140, or one separator 190 may be arranged along the axial direction of the tightening tube 140, as long as the separator 190 can separate the first clamp 110 from the middle clamp 150, and the second clamp 120 from the middle clamp 150. That is, in the axial direction of the tightening tube 140, the separators 190 may be arranged continuously or at intervals, and the lengths of each separator 190 along the axial direction of the tightening tube 140 may be different.

[0069] like Figure 6 As shown, the axial length of the separator 190 is smaller than the axial length of the tightening tube, so as to facilitate the processing of the tightening tube 140 and the connection between the tightening tube 140 and the separator 190 and the middle shaft assembly 160 .

[0070] In this embodiment, the tightening tube 140 and the separator 190 can be formed in one piece or by welding. The tightening tube 140 and the separator 190 can also be formed by folding and welding at least two metal plates.

[0071] In this embodiment, the separator 190 is preferably slidably connected to the first clip 110, the second clip 120 and the middle clip 150. In this way, while avoiding interference between the first clip 110 and the middle clip 150, and the second clip 120 and the middle clip 150, it can also improve the smoothness of repeated movement of the first clip 110, the middle clip 150 and the second clip 120, improve the operating experience, and improve the surgical efficiency.

[0072] refer to Figure 4 and Figure 7 , Figure 71 is a schematic diagram of the structure of the first clip 110, the second clip 120 and the middle clip 150 in the first embodiment of the present invention, and a limiting groove 141 is provided on the tightening tube 140. Specifically, when the proximal ends of the first clip 110 and the second clip 120 move to the limiting groove 141, under the compression of the tightening tube 140, the proximal ends of the first clip 110 and the second clip 120 are inserted into the limiting groove 141, so that the limiting groove 141 and the proximal ends of the first clip 110 and the second clip 120 cooperate with each other, restricting the first clip 110 and the second clip 120 from continuing to move toward the proximal end, thereby preventing the first clip 110 and the second clip 120 from passing through the proximal end of the tightening tube 140. In this way, the risk of the first clip 110 and the second clip 120 passing through the proximal end of the tightening tube 140 can be reduced, and the reliability of the hemostatic clip can be improved. The proximal ends of the first clip 110 and the second clip 120 cooperate with the limiting groove 141 , and the proximal ends of the first clip 110 and the second clip 120 may be clamped in the limiting groove 141 .

[0073] In order to further prevent the first clip and the second clip from being transmitted from the proximal end of the tightening tube, the first clip 110 and the second clip 120 are provided with a limiting protrusion 130 on one side away from the tube wall of the tightening tube 140, which plays a double limiting role. Figure 2 , Figure 3 , Figure 4 and Figure 7 The distal end surface of the tightening tube 140 is provided with a blocking piece 142 that cooperates with the limiting protrusion 130, and the blocking piece 142 cooperates with the limiting protrusion 130 to limit the first clip 110 and the second clip 120 from moving toward the proximal end of the tightening tube 140. In this way, the first clip 110 and the second clip 120 can be further prevented from passing through the proximal end of the tightening tube 140, and the reliability of the auxiliary hemostatic clip can be further improved. Specifically, when the proximal ends of the first clip 110 and the second clip 120 move to the limiting groove 141, after the limiting groove 141 cooperates with the proximal ends of the first clip 110 and the second clip 120, the limiting protrusion 130 can further limit the proximal movement of the first clip 110 and the second clip 120 to prevent the first clip 110 and the second clip 120 from passing through the proximal end of the tightening tube 140. In this way, a double limiting effect can be achieved, reducing the risk of the first clip 110 and the second clip 120 passing through the proximal end of the tightening tube 140.

[0074] In other embodiments, the limiting protrusion 130 may also be arranged on one surface of the tube wall of the first clamp 110 and the second clamp 120 close to the tightening tube 140. As long as the first clamp 110 and the second clamp 120 move toward the proximal end of the tightening tube 140 until the limiting protrusion 130 cooperates with the distal end of the tightening tube 140 and / or cooperates with the blocking piece 142 arranged on the distal end of the tightening tube 140, the first clamp 110 and the second clamp 120 can be limited from further moving toward the proximal end.

[0075] The outer diameter of the tightening tube 140 is 2.2-2.6 mm, and the length is 5-8 mm. The first clamp 110, the second clamp 120 and the tightening tube 140 can be made of titanium alloy or stainless steel. The opening angle between the first clamp 110, the second clamp 120 and the middle clamp 150 is 15-75°.

[0076] Hemostatic Clip Reference Figure 8 , Fig. 9 , Fig.10 and Fig.11 , Figure 8 It is a cross-sectional view of the chuck and the central axis assembly 160 in the first embodiment of the present invention, wherein the tightening tube 140, the first clip 110 and the second clip 120 constitute the chuck of the hemostatic clip. Fig. 9 is a structural schematic diagram of the chuck and the middle shaft assembly 160 in the first embodiment of the present invention, Fig.10 is another structural schematic diagram of the chuck and the middle shaft assembly 160 in the first embodiment of the present invention, Fig.11 1 is a schematic structural diagram of a central axis assembly 160 in the first embodiment of the present invention. The central axis assembly 160 includes a sheath front end tube 161 , a connector 163 and a pull ring 164 .

[0077] The proximal end of the sheath tube front end tube 161 is connected to the traction assembly 170 (refer to Figure 1), and the distal end of the sheath front end tube 161 is detachably connected to the tightening tube 140 through the connecting piece 163. The traction assembly 170 is used to drive the pull ring 164 to move toward the distal end, and the pull ring 164 separates the connecting piece 163 from the tightening tube 140 and the sheath front end tube 161 during the movement toward the distal end. The proximal end of the intermediate clip 150 is disposed in the lumen of the sheath front end tube 161 and is fixedly connected to the lumen of the sheath front end tube 161, so that the pull ring 164 can be driven to move toward the distal end by the traction assembly 170, thereby separating the connecting piece 163 from the sheath front end tube 161 and the tightening tube 140, and further separating the sheath front end tube 161 and the tightening tube 140. When the front end tube 161 of the sheath tube and the tightening tube 140 have been separated, the first clamp 110 and the second clamp 120 have clamped the tissue. If the middle axis assembly 160 continues to move proximally as a whole under the action of the traction assembly 170, the axis assembly can be separated from the chuck, and the middle clamp 150 can be separated from the first clamp 110 and the second clamp 120.

[0078] The connecting piece 163 is an elastic piece. When the elastic piece is released, the connecting piece 163 is respectively connected to the tightening tube 140 and the front end tube 161 of the sheath tube, thereby connecting the tightening tube 140 and the front end tube 161 of the sheath tube; when the elastic piece is pressurized, the connecting piece 163 is separated from the tightening tube 140 and the front end tube 161 of the sheath tube, thereby separating the tightening tube 140 and the front end tube 161 of the sheath tube.

[0079] like Figure 8 As shown, the proximal end of the tightening tube 140 is sleeved on the distal end of the sheath front end tube 161, and two insertion holes 143 are provided on the tightening tube 140, and a limiting hole 162 corresponding to the insertion holes 143 is provided on the sheath front end tube 161. The elastic member is a spring pin of a type. When the spring pin is released, the two ends of the spring pin are arranged through the insertion holes 143 and the limiting holes 162, thereby limiting the axial movement of the tightening tube 140 relative to the sheath front end tube 161, and in particular, limiting the axial separation of the tightening tube 140 and the sheath front end tube 161. When the spring pin is compressed, the two ends of the spring pin are disengaged from the insertion holes 143 and the limiting holes 162.

[0080] The spring pins can be bent from metal materials such as stainless steel. The pull ring 164 can be a metal ring or a plastic ring.

[0081] The sheath tube front end tube 161 can be fixedly connected to the middle clamp 150 by welding, and can also be fixedly connected to the traction assembly 170 by welding. The sheath tube front end tube 161 can be a metal tube, such as a stainless steel tube.

[0082] The sheath tube front end tube 161 has a length of 3-8 mm and can be made of stainless steel or titanium alloy.

[0083] refer to Fig.11 The middle clip 150 is in sheet shape and can be formed by cutting a metal sheet.

[0084] refer to Fig.12 , Fig.13 and Fig.14 , Fig.12 is a schematic diagram of the structure of the traction assembly 170 in the first embodiment of the present invention, Fig.13 is a schematic diagram of the structure of the hook 174 in the first embodiment of the present invention, Fig.14 It is a structural schematic diagram of the hook 174 and the first clip 110 in Example 1 of the present invention. The traction assembly 170 includes a sheath 171, two core wires 173, two hooks 174 and two connecting pins 176. The proximal end of the sheath 171 is connected to the control handle 180, and the distal end of the sheath 171 is fixedly connected to the central axis assembly 160 (the distal end of the sheath front end tube 161). The two core wires 173 are arranged in the lumen of the sheath 171, the proximal end of the core wire 173 is connected to the control handle 180, and the distal end of the core wire 173 is fixedly connected to the hook 174. The two hooks 174 are respectively connected to the first clip 110 and the second clip 120 through the connecting pins 176. The control handle 180 is used to pull the first clamp 110 and the second clamp 120 to reciprocate in the tightening tube 140 through the two core wires 173, so as to open or close the first clamp formed by the first clamp 110 and the middle clamp 150, and the second clamp formed by the second clamp 120 and the middle clamp 150. If the force applied to the connection between the hook 174 and the connecting pin 176 is greater than a preset force, the hook 174 and the connecting pin 176 are separated.

[0085] When the force applied to the connection between the hook 174 and the connecting pin 176 is greater than the preset force, the hook 174 and the connecting pin 176 are separated, so that the indirect connection between the hook 174 and the first clip 110 or the second clip 120 through the connecting pin 176 is invalidated, thereby disconnecting the traction assembly 170 from the first clip 110 and the second clip 120. Since the connection between the traction assembly 170 and the first clip 110 and the second clip 120 can be disconnected, the connection between the middle shaft assembly 160 and the tightening tube 140 can be disconnected, so that the first clip 110, the second clip 120 and the tightening tube 140 can be separated from the middle clip 150, the middle shaft assembly 160, the traction assembly 170 and the control handle 180.

[0086] Specifically, if the force applied to the connection between the hook 174 and the connecting pin 176 is greater than a preset force, the hook 174 will be released from the connecting sheath, thereby invalidating the connection between the first clip 110 or the second clip 120 and the hook 174 .

[0087] refer to Fig.15 and Fig.16 , Fig.15 1 is a schematic diagram of the structure of the connecting pin 176 before the connecting pin 176 is connected to the hook 174 and one of the first clip 110 or the second clip 120 in the first embodiment. Fig.16 1 is a schematic diagram of the structure of the connecting pin 176 after the connecting pin 176 is connected to the hook 174 and one of the first clip 110 or the second clip 120 in the first embodiment. The first clip 110 is provided with a first pin hole corresponding to the connecting pin 176, and the second clip 120 is provided with a second pin hole corresponding to the connecting pin 176. Before the connecting pin 176 is connected to the hook 174 and the first clip 110 and the second clip 120, the connecting pin 176 is tubular, and a plurality of cutting grooves 177 are provided on the connecting pin 176. The cutting grooves 177 extend from both ends of the connecting pin 176 to the middle part of the connecting pin 176. After the connecting pin 176 is connected to the hook 174 and the first clip 110 and the second clip 120, the connecting pin 176 passes through the first pin hole and the hook 174, and the outer diameters of both ends of the connecting pin 176 are greater than the outer diameter of the middle part of the connecting pin 176.

[0088] In the process of connecting the hook 174 and the first clip 110 through the connecting pin 176, one connecting pin 176 is passed through the first pin hole and the hook 174, and the other connecting pin 176 is passed through the second pin hole and the hook 174, and force is applied to both ends of the two connecting pins 176 to make the two ends of the connecting pin 176 flip in the direction away from the axis of the connecting pin 176, so that the outer diameter of the two ends of the connecting pin 176 is greater than the outer diameter of the middle part of the connecting pin 176, thereby limiting the first clip 110 and the hook 174 or the second clip 120 and the hook 174 arranged between the two ends of the connecting pin 176 from separating from each other, so that the first clip 110 and the hook 174 are connected by the connecting pin 176, and the second clip 120 and the hook 174 are connected by the connecting pin 176.

[0089] Specifically, before the connecting pin 176 is connected to the hook 174 and one of the first clip 110 or the second clip 120, the length of the connecting pin 176 along the axial direction is between 2 and 3 mm. The connecting pin 176 is a stainless steel metal tube. The stainless steel metal tube can be formed by laser cutting, and the cutting groove 177 on the stainless steel metal tube can also be processed by laser cutting. The connecting pin 176 has the advantages of simple processing, convenient operation and high reliability.

[0090] refer to Fig.13 and Fig.14 The hook 174 is in a sheet shape, and a deformation groove 175 is formed on the hook 174, and the connecting pin 176 is arranged through the deformation groove 175. When the force applied to the connection between the hook 174 and the connecting pin 176 is greater than a preset force, the deformation groove 175 is deformed, so that the hook 174 is separated from the connecting pin 176.

[0091] The hook 174 and the core wire 173 are fixedly connected by laser welding.

[0092] refer to Fig. 9 and Fig.10 The pull ring 164 is arranged in the front end metal tube of the sheath tube 171, and a core wire 173 and the elastic member on one side are arranged through the pull ring 164. The core wire 173 is made of stainless steel or titanium alloy.

[0093] refer to Fig.12 The sheath tube 171 includes a first proximal sheath tube 171a, a second proximal sheath tube 171b, a distal sheath tube 171c and a connecting tube 172. The proximal end of the connecting tube 172 is fixedly connected to the distal ends of the first proximal sheath tube 171a and the second proximal sheath tube 171b, respectively. The distal end of the connecting tube 172 is fixedly connected to the proximal end of the distal sheath tube 171c. The distal end of the distal sheath tube 171c is fixedly connected to the sheath tube front end tube 161. The proximal ends of the first proximal sheath tube 171a and the second proximal sheath tube 171b are fixedly connected to one of the control handles 180. After passing through the distal sheath tube 171c and the connecting tube 172, the two core wires 173 pass through the first proximal sheath tube 171a and the second proximal sheath tube 171b, respectively, and are connected to the control handle 180. In this way, the first clamp 110 and the second clamp 120 can be controlled respectively by two control handles 180, which can improve the flexibility of the instrument. In addition, the two control handles 180 can be operated by two people, which requires lower proficiency of doctors in endoscopic surgery, reduces the difficulty of surgery, and facilitates the promotion and application of endoscopic frontal treatment surgery.

[0094] Among them, the front end tube 161 of the sheath can be fixedly connected to the distal end of the distal sheath 171c by laser welding, the distal end of the connecting tube 172 can be fixedly connected to the proximal end of the distal sheath 171c by welding, and the proximal end of the connecting tube 172 can be fixedly connected to the first proximal sheath 171a and the second proximal sheath 171b by welding respectively.

[0095] The outer diameters of the first proximal sheath tube 171a, the second proximal sheath tube 171b, the distal sheath tube 171c and the connecting tube 172 are 2 to 2.4 mm. The lengths of the first proximal sheath tube 171a and the second proximal sheath tube 171b are 50 to 150 mm. The length of the distal sheath tube 171c is 120 to 250 mm. The length of the connecting tube 172 is 10 to 30 mm.

[0096] refer to Fig.17 and Fig.18 , Fig.17 is a schematic diagram of the structure of the control handle 180 in the first embodiment, Fig.18 1 is an exploded view of the control handle 180 in the first embodiment, wherein the first proximal sheath tube 171a and the second proximal sheath tube 171b are respectively fixedly connected to a control handle. The control handle 180 comprises a handle body 181, a handle pull ring 182 and a limit buckle 183, wherein the handle pull ring 182 is sleeved on the handle body 181 and can reciprocate relative to the handle body 181. The limit buckle 183 is engaged with the distal end of the handle body 181. The first proximal sheath tube 171a and the second proximal sheath tube 171b are fixedly connected with the corresponding limit buckle 183 and the handle body 181. The handle body 181 has a control cavity with a distal opening, and the limit buckle 183 has a limit cavity, wherein the proximal and distal ends of the limit cavity are provided with openings. The proximal end of the limit cavity is in communication with the control cavity. The core wire 173 passes through the corresponding limit cavity and the control cavity in sequence and is fixedly connected with the handle pull ring 182. The handle pull ring 182 can be driven to reciprocate relative to the handle body 181 to drive the core wire 173 to reciprocate, thereby pulling the first clamp 110 and the second clamp 120 to reciprocate.

[0097] Specifically, the traction assembly further includes a limiting ring, the proximal end of the first proximal sheath 171a is fixedly connected to the limiting ring, the proximal end of the second proximal sheath 171b is fixedly connected to the limiting ring, a limiting portion is provided in the limiting cavity of the limiting buckle 183, the limiting portion is annular, the two limiting rings connected to the first proximal sheath 171a and the second proximal sheath 171b are provided in the corresponding limiting cavity, and the limiting portion is used to limit the limiting ring to move distally relative to the limiting buckle 183. A limiting tube is extended from the distal end of the handle body, the limiting tube is provided in the limiting cavity, and the limiting tube is used to limit the limiting ring to move proximally relative to the limiting buckle 183. In this way, under the joint action of the limiting buckle 183 and the limiting cavity, the limiting ring is limited to move in the limiting cavity, thereby limiting the movement of the first proximal sheath 171a or the second proximal sheath 171b fixedly connected to the limiting ring. Wherein, the limiting ring can be made of metal material.

[0098] A limiting buckle is extended from the proximal end of the limiting buckle 183 , and a limiting slot engaged with the limiting buckle is provided on the handle body 181 . The limiting buckle 183 and the handle body 181 are fixedly connected by the engagement between the limiting buckle and the limiting slot.

[0099] The control handle 180 is made of ABS plastic.

[0100] In this embodiment, the first clip 110 and the second clip 120 can be opened and closed repeatedly independently.

[0101] Specifically, since the two control handles 180 for controlling the repeated opening and closing of the first clamp 110 or the second clamp 120 are independent of each other, and the process and principle of the control handle 180 controlling the first clamp 110 or the second clamp 120 are similar, the following only uses the control handle 180 driving the first clamp 110 to repeatedly open and close as an example to illustrate the principle of repeated opening and closing of the first clamp 110 and the second clamp 120.

[0102] By toggling the handle pull ring 182 of the control handle 180 to move the handle pull ring 182 toward the proximal end relative to the handle body 181, the handle pull ring 182 can pull the core wire 173 toward the proximal end relative to the handle body 181, and pull the first clamp 110 toward the proximal end through the core wire 173, so that the distal end of the first clamp 110 is close to the middle clamp 150, so that the first clamp formed by the first clamp 110 and the middle clamp 150 is closed. The core wire 173, the hook 174 and the connecting pin 176 can be pulled toward the proximal end by the handle pull ring 182, and then the first clamp 110 can be pulled toward the proximal end by the connecting pin 176. In the process of toggling the handle pull ring 182 to move the handle pull ring 182 toward the proximal end relative to the handle body 181, before the proximal end of the first clip 110 cooperates with the limiting groove 141 in the tightening tube 140, the handle pull ring 182 can be toggled to move the handle pull ring 182 toward the distal end relative to the handle body 181, so that the distal end of the first clip 110 is away from the middle clip 150, so that the first clip formed by the first clip 110 and the middle clip 150 is opened. In this way, according to the needs of the operation, during use, the handle pull ring 182 can be toggled to move the handle pull ring 182 toward the proximal end or toward the distal end relative to the handle body 181, so that the first clip formed by the first clip 110 and the middle clip 150 is closed or opened, which can improve the operability of the hemostatic clip, facilitate the doctor's operation, and improve the efficiency of the operation.

[0103] In this embodiment, the first clip 110, the second clip 120 and the tightening tube 140 can be separated from the central shaft assembly 160 and the pulling assembly 170. The tightening tube 140, the first clip 110 and the second clip 120 constitute the clamp head of the hemostatic clip.

[0104] First, the first clip 110 and the second clip 120 can be controlled to close respectively by the two control handles 180. Specifically, since the two control handles 180 for controlling the closing of the first clip 110 or the second clip 120 are independent of each other, and the process and principle of the control handles 180 controlling the first clip 110 or the second clip 120 are similar, the following only takes the control handle 180 driving the first clip 110 to close as an example to illustrate the process of closing the first clip 110 and the second clip 120.

[0105] By toggling the handle pull ring 182 to move the handle pull ring 182 toward the proximal end relative to the handle body 181, the handle pull ring 182 can pull the core wire 173 toward the proximal end relative to the handle body 181, and pull the first clip 110 toward the proximal end relative to the handle body 181 through the core wire 173, and at the same time make the distal end of the first clip 110 close to the middle clip 150, so that the first clip 110 and the middle clip 150 The first clamp formed by the first clip 110 and the middle clip 150 is closed. When the first clip 110 moves to the proximal end of the first clip 110 and cooperates with the limiting groove 141, the limiting groove 141 restricts the first clip 110 from continuing to move toward the proximal end. At this time, the second clip formed by the first clip 110 and the middle clip 150 is closed. The situation after the first clip formed by the first clip 110 and the middle clip 150 is closed can be referred to. Fig.19 , Fig.19 1 is a schematic diagram of the structure of the first clamp formed by the first clamp 110 and the middle clamp 150 in the first embodiment of the present invention after being closed. The situation in which the first clamp formed by the first clamp 110 and the middle clamp 150 and the second clamp formed by the second clamp 120 and the middle clamp 150 are both closed can be referred to Fig. 20 , Fig. 20 It is a schematic structural diagram of the first clamp formed by the first clamp 110 and the middle clamp 150 and the second clamp formed by the second clamp 120 and the middle clamp 150 in the first embodiment of the present invention after being closed.

[0106] Afterwards, if the handle pull ring 182 is continuously toggled, under the action of the core wire 173, the connection between the core wire 173 and the first clip 110 or the connection between the core wire 173 and the second clip 120 is subjected to a tension greater than a preset force, and the connection between the first clip 110 and the core wire 173 and the connection between the second clip 120 and the core wire 173 will be disconnected. When the tension between the first clip 110 and the second clip 120 is subjected to a tension greater than a preset force, the deformation groove 175 in the hook 174 is deformed, and the hook 174 is separated from the connecting pin 176, thereby disconnecting the connection between the first clip 110 and the second clip 120 and the traction assembly 170.

[0107] Afterwards, if the handle pull ring 182 continues to be turned, that is, the core wire 173 and the hook 174 continue to be pulled toward the proximal end, the core wire 173 will drive the pull ring 164 to move toward the proximal end, and the pull ring 164 will separate the connecting piece 163 from the tightening tube 140 and the front end tube 161 of the sheath tube during the process of moving toward the proximal end. Specifically, since the core wire 173 and the elastic member on one side are arranged through the pull ring 164, when the hook 174 is separated from the first clip 110 and the second clip 120, if the core wire 173 is continued to be pulled, the core wire 173 and the hook 174 will drive the pull ring 164 to move toward the proximal end. During the process of the pull ring 164 moving toward the proximal end, the pull ring 164 can make the two ends of the connecting member 163 approach each other, and the two ends of the connecting member 163 are disengaged from the tightening tube 140 and the front end tube 161 of the sheath tube, so that the connecting member 163 is separated from the tightening tube 140 and the front end tube 161 of the sheath tube. The separation of the hook 174 from the connecting pin 176 and the separation of the tightening tube 140 and the front end tube 161 of the sheath tube can be referred to Fig.21 , Fig. 22 and Fig.23 ,in, Fig.21 1 is a schematic diagram of the structure of the hemostatic clip in the process of the hook 174 being separated from the connecting pin 176 and the tightening tube 140 and the front end tube 161 of the sheath tube being separated in the first embodiment of the present invention. Fig. 22 This is a partial structural schematic diagram of the hemostatic clip in the process of the hook 174 being separated from the connecting pin 176 and the tightening tube 140 and the front end tube 161 of the sheath tube being separated in the first embodiment of the present invention. Fig.23 This is another partial structural schematic diagram of the hemostatic clip in the process of the hook 174 being separated from the connecting pin 176 and the tightening tube 140 and the front end tube 161 of the sheath tube being separated in the first embodiment of the present invention.

[0108] Since the core wire 173 can be separated from the first clip 110 and the second clip 120, and the tightening tube 140 can be separated from the connecting piece 163 and the front end tube 161 of the sheath tube in sequence during the process of toggling the handle pull ring 182 to move toward the proximal end relative to the handle body 181, the first clip 110, the second clip 120 and the tightening tube 140 can be separated from the traction assembly 170 and the central axis assembly 160. In this way, during the operation, after the first clip 110, the second clip 120 and the tightening tube 140 are separated from the traction assembly 170 and the core wire 173, the position of the separated clamp can be adjusted by other devices. Since the connecting pin 176 is not separated from the first clip 110 or the second clip 120 when the hook 174 is separated from the connecting pin 176, the connecting pin 176 will be separated from the traction assembly 170 and the central axis assembly 160 along with the first clip 110, the second clip 120 and the tightening tube 140.

[0109] This embodiment further provides an auxiliary system, which includes the hemostatic clip in the above embodiment and an endoscope, wherein the endoscope is used for conveying and pulling the hemostatic clip.

[0110] In this embodiment, the process of closing the defective tissue by the auxiliary system is roughly as follows:

[0111] First, the defective tissue is detected through endoscopy.

[0112] Secondly, the hemostatic clip is delivered to the defective tissue through the endoscope channel, and the first clip 110 and the second clip 120 of the hemostatic clip are released through the endoscope channel. After the release, the first clip 110 and the second clip 120 of the hemostatic clip are in an open state.

[0113] Secondly, by driving the first clip 110 and the second clip 120 of the hemostatic clip to open and close repeatedly, the first clip 110, the second clip 120 and the middle clip 150 clamp the lesion. In the process of clamping the lesion by the clamp head, a control handle 180 can be used to control one of the first clip 110 or the second clip 120 and the middle clip 150 to clamp one side of the defective tissue, so that the first clip 110 and the middle clip 150 are closed and the first clip 110 and the connecting pin 176 are separated from the corresponding hook 174. Through endoscopic traction, the second clip 120 and the middle clip 150 clamp the other side of the defective tissue, and the other control handle 180 is controlled to close the second clip 120 and the middle clip 150 and separate the second clip 120 and the connecting pin 176 from the corresponding hook 174.

[0114] Afterwards, the core wire 173 is pulled by the two control handles 180 to separate the traction assembly 170 from the first clamp 110 and the second clamp 120, and the tightening tube 140 and the front end metal tube of the sheath tube 171 are separated by pulling the core wire 173, so that the middle clamp 150 is pulled out from between the two partitions, avoiding the situation where the first clamp 110 and the second clamp 120 are in direct contact and interference with each other and cannot be pulled out, so that the clamp falls off, and the defective tissue is closed or hemostasis is achieved.

[0115] Embodiment 2

[0116] This embodiment provides a hemostatic clip. The main difference between the hemostatic clip in this embodiment and the hemostatic clip in the first embodiment is that there is only one control handle 180, and one control handle 180 can control the first clip 110 and the second clip 120 respectively, and the sheath tube only includes a single sheath tube, and the proximal end of the single sheath tube is fixedly connected to the control handle. Fig.24 , Fig.25 and Fig.26 , Fig.24is a schematic diagram of the structure of the hemostatic clip in the second embodiment, Fig.25 is an axonometric view of the hemostatic clip in the second embodiment, Fig.26 1 is a partial enlarged schematic diagram of the hemostatic clip in the second embodiment, the control handle 180 includes a handle body 181, two handle pull rings 182 and a limit buckle 183, the two handle pull rings 182 are respectively slidably connected to the handle body 181, and the handle pull ring 182 can reciprocate relative to the handle body 181. The limit buckle 183 is clamped with the distal end of the handle body 181.

[0117] refer to Fig. 27 , Fig. 27 It is a schematic diagram of the structure of the hemostatic clip in the second embodiment. The sheath in the sheath assembly in this embodiment is only a single sheath, and the two core wires in the traction assembly are arranged in the lumen of the sheath. The proximal end of the sheath 171 is fixedly connected to the handle body and the limiting buckle 183. The handle body 181 has a control cavity with a distal opening, and the limiting buckle 183 has a limiting cavity, and the proximal and distal ends of the limiting cavity are provided with openings. The proximal end of the limiting cavity is connected to the control cavity. The two core wires 173 pass through the limiting cavity and the control cavity in turn and are fixedly connected to the corresponding handle pull ring 182. The corresponding core wire 173 can be driven to reciprocate by driving the handle pull ring 182 to move back and forth relative to the handle body 181. For details, refer to Fig.26 , the traction assembly also includes a limiting ring, and the sheath 171 is fixedly connected to the limiting ring. A limiting portion 184 is provided in the limiting cavity of the limiting buckle 183, and the limiting portion 184 is ring-shaped. The limiting ring is arranged in the limiting cavity, and the limiting portion 184 is used to limit the distal movement of the limiting ring relative to the limiting buckle 183. A limiting tube 185 extends from the distal end of the handle body, and the limiting tube 185 is arranged in the limiting cavity, and the limiting tube 185 is used to limit the proximal movement of the limiting ring relative to the limiting buckle 183. In this way, under the joint action of the limiting buckle 183 and the limiting cavity, the limiting ring is limited to move in the limiting cavity, thereby limiting the movement of the sheath fixedly connected to the limiting ring. Wherein, the limiting ring can be made of metal material.

[0118] like Fig.26 As shown, a limiting buckle 186 extends from the proximal end of the limiting buckle 183, and a limiting slot 187 engaged with the limiting buckle 186 is provided on the handle body 181. The limiting buckle 183 and the handle body 181 are fixedly connected by the limiting buckle 186 and the limiting slot 187.

[0119] In this embodiment, the process of controlling the first clamp and the second clamp to open and close relative to the middle clamp by the control handle can be referred to as Fig.28 , Fig.29 and Fig.30 , Fig.28 is a schematic diagram of the structure of the first clamp formed by the first clamp and the middle clamp after closing. Fig.29 It is a schematic diagram of the structure after the first clamp formed by the first clamp and the middle clamp, and the second clamp formed by the second clamp and the middle clamp are closed. Fig.30 It is a schematic diagram of the structure after the chuck is separated from the middle shaft assembly, the traction assembly and the control handle.

[0120] The hemostatic clip in the above embodiment adopts a three-petal structure, and the first clip 110 and the second clip 120 can be independently controlled by two control handles 180, which improves the flexibility of using the instrument during surgery. First, the first clip 110 and the middle clip 150 are aligned with the tissue on one side of the wound surface, and then the tissue on one side of the wound surface is firmly grasped and fixed. Afterwards, the second clip 120 is aligned with the tissue on the other side of the wound surface, and the tissue on the other side of the wound surface is firmly grasped and fixed. The grasping process is simple and reliable, and can achieve the closure of tissue defects or perforations with large areas or complex shapes.

[0121] The first clamp 110 and the second clamp 120 can be repeatedly opened and closed, and the number of positioning times is unlimited. The relative position of the instrument and the tissue can be repeatedly adjusted, and the clamp head can be removed after the position is appropriate, which can avoid situations such as unsatisfactory grasping position or damage to the tissue. The middle clamp 150 mainly plays a fixed supporting role, which is convenient for positioning, clamping and pulling the defective tissue. After the first clamp 110 and the second clamp 120 are closed, it can be removed together with the central shaft assembly 160.

[0122] In the above embodiment, the hemostatic clip can be used for endoscopic surgical treatment operated by two people, including hemostasis, perforation closure, fistula closure, repair of defective tissue or as an auxiliary tool for other treatment methods. The term "endoscope" used in this article refers to a medical endoscope for treatment or inspection purposes, including a gastroscope, colonoscope, duodenoscope, small intestine scope, choledochoscope, bronchoscope, or other endoscopes with an operating channel (or working forceps channel). In addition, the hemostatic clip can also be used for two-person double-handle operation under laparoscope or in conjunction with other laparoscope instruments for hemostasis or perforation repair.

[0123] The "proximal end" and "distal end" in the above embodiments refer to the relative orientation, relative position, and direction of the components or actions relative to each other from the perspective of the doctor using the medical device. Although the "proximal end" and "distal end" are not restrictive, the "proximal end" generally refers to the end of the medical device that is close to the doctor during normal operation, and the "distal end" generally refers to the end that first enters the patient's body. In addition, the term "or" in the above embodiments is generally used in a sense including "and / or", unless otherwise explicitly stated. In the above embodiments, "both ends" refer to the proximal end and the distal end.

[0124] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A hemostatic clip, characterized in that: It includes a first clamp, a second clamp, a tightening tube, an intermediate clamp, a middle shaft assembly, a traction assembly, a control handle and at least two separators; The control handle, the traction assembly, the middle axis assembly and the tightening tube are connected in sequence from the proximal end to the distal end, wherein the control handle is connected to the proximal end of the traction assembly, the distal end of the traction assembly is connected to the proximal end of the middle axis assembly, and the distal end of the middle axis assembly is connected to the tightening tube; The proximal ends of the first clip and the second clip are arranged in the tightening tube, the proximal ends of the first clip and the second clip are connected to the traction assembly, the proximal end of the middle clip passes through the tightening tube and is fixedly connected to the middle shaft assembly, the first clip and the second clip are arranged on both sides of the middle clip, the first clip and the middle clip form a first clip, and the second clip and the middle clip form a second clip; The separator is disposed in the lumen of the tightening tube and extends axially along the lumen of the tightening tube, and is located between the first clip and the middle clip, and between the second clip and the middle clip; The control handle controls the first clamp and the second clamp to reciprocate in the tightening tube through the pulling assembly, so that the distal ends of the first clamp and / or the second clamp are close to or away from the middle clamp, thereby opening or closing the first clamp and / or the second clamp; The central axis assembly includes a sheath front end tube and a connecting piece, the proximal end of the sheath front end tube is connected to the traction assembly, the distal end of the sheath front end tube is detachably connected to the tightening tube via the connecting piece, the proximal end of the middle clip is fixedly connected to the sheath front end tube, the traction assembly is used to drive the sheath front end tube to separate the connecting piece from the tightening tube during the process of moving toward the proximal end, and the middle clip moves toward the proximal end with the sheath front end tube.

2. The hemostatic clip according to claim 1, characterized in that: The tightening tube and the partition are integrally formed.

3. The hemostatic clip according to claim 1, characterized in that: The tightening tube and the partition are formed by welding.

4. The hemostatic clip according to claim 1, characterized in that: The number of the separators is two, and the two separators are in a plate shape.

5. The hemostatic clip according to claim 4, characterized in that: The distance between the two separators is in the range of 0.1-0.8 mm.

6. The hemostatic clip according to claim 4, characterized in that: The distance between the two separators is 0.2 mm.

7. The hemostatic clip according to claim 4, characterized in that: The tightening tube and the two separators are formed by folding and welding at least two metal plates.

8. The hemostatic clip according to claim 1, characterized in that: The tightening tube is provided with a limiting groove, and the limiting groove cooperates with the proximal ends of the first clip and the second clip to limit the first clip and the second clip from moving toward the proximal end relative to the tightening tube.

9. The hemostatic clip according to claim 1, characterized in that: A limiting protrusion is arranged on one surface of the first clamp and the second clamp away from the tube wall of the tightening tube, and a blocking piece cooperating with the limiting protrusion is arranged on the distal end surface of the tightening tube, and the blocking piece cooperates with the limiting protrusion to limit the movement of the first clamp and the second clamp toward the proximal end of the tightening tube.

10. The hemostatic clip according to claim 1, characterized in that: The central axis assembly also includes a pull ring, and the traction assembly is used to drive the pull ring to move toward the distal end. During the process of moving toward the distal end, the pull ring separates the connecting piece from the tightening tube and the front end tube of the sheath tube. The proximal end of the middle clip is arranged in the lumen of the front end tube of the sheath tube and is fixedly connected to the lumen of the front end tube of the sheath tube.

11. The hemostatic clip according to claim 10, characterized in that: The connecting piece is an elastic piece. When the elastic piece is released, the connecting piece is connected to the tightening tube and the front end tube of the sheath tube; when the elastic piece is compressed, the connecting piece is separated from the tightening tube and the front end tube of the sheath tube.

12. The hemostatic clip according to claim 1, characterized in that: The traction assembly includes a sheath, two core wires, two hooks and two connecting pins. The proximal end of the sheath is connected to the control handle, and the distal end of the sheath is fixedly connected to the central axis assembly. The two core wires are arranged in the lumen of the sheath, the proximal end of the core wire is connected to the control handle, and the distal end of the core wire is fixedly connected to the hooks. The two hooks are respectively connected to the first clip and the second clip through the connecting pins, and the control handle is used to pull the first clip and the second clip to reciprocate in the tightening tube through the two core wires.

13. The hemostatic clip according to claim 12, characterized in that: The sheath tube includes a first proximal sheath tube, a second proximal sheath tube, a distal sheath tube and a connecting tube. The proximal end of the connecting tube is fixedly connected to the distal ends of the first proximal sheath tube and the second proximal sheath tube, respectively. The distal end of the connecting tube is fixedly connected to the proximal end of the distal sheath tube. The distal end of the distal sheath tube is fixedly connected to the front end tube of the sheath tube. The proximal ends of the first proximal sheath tube and the second proximal sheath tube are fixedly connected to one of the control handles, respectively. After the two core wires pass through the distal sheath tube and the connecting tube, they pass through the first proximal sheath tube and the second proximal sheath tube, respectively, and are connected to the control handle.

14. An auxiliary system, characterized in that: comprising an endoscope, and a hemostatic clip as claimed in any one of claims 1 to 13; The endoscope is provided with an endoscope channel, the hemostatic clip is arranged in the endoscope channel, and the endoscope channel is used for conveying and pulling the hemostatic clip.

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