A hemostatic clip

Abstract

The present invention relates to a hemostatic clip, in which a clamp assembly is connected to a traction mechanism by means of interference fit, and when the connection between the clamp assembly and the traction mechanism needs to be released, only an external force that can overcome the interference fit force between the two needs to be provided. The hemostatic clip has a simple structure and is easy to use, and when the connection is released, there is no breakage of the structural parts, and there is no risk of broken objects remaining in the body and entering the wound to cause inflammation.

Description

Technical Field

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

[0002] With the continuous advancement of endoscopic minimally invasive technology, endoscopic submucosal dissection (ESD), endoscopic retrograde cholangiopancreatography (ERCP), natural orifice endoscopic surgery (NOTES) and other endoscopic treatment surgeries have been widely carried out. Safe and effective closure of defects or perforations in digestive tract tissues during surgery is a key issue that must be addressed in various endoscopic minimally invasive surgeries.

[0003] A hemostatic clip is a device used to close defects or perforations in lumen tissue. The clamp of the hemostatic clip in the prior art can realize the opening, closing and rotating functions. After being transported to the target position, the clamp is driven to move by a traction mechanism to realize the opening, closing and rotating functions, and clamp the tissue at the target position. After that, the clamp is separated from the traction mechanism and retained in the body until the tissue at the target position grows completely to close the defect or perforation at the position, and then falls off and is discharged from the body through the digestive tract.

[0004] The chuck of the hemostatic clip in the prior art can be connected to the traction mechanism through a hook, and the connection between the two can be released by breaking the hook, but once the broken hook falls into the wound, it will cause inflammation and other problems. Alternatively, the chuck can be connected to the traction mechanism through the cooperation of the ball head and the connecting yoke, and the connection can be released by the deformation of the connecting yoke, but the processing technology of the connecting yoke is complicated. Summary of the invention

[0005] The object of the present invention is to provide a hemostatic clip, aiming to simplify the structure of the hemostatic clip and ensure that there is no risk of broken material remaining during use.

[0006] To achieve the above object, the present invention provides a hemostatic clip, comprising:

[0007] The traction device comprises a traction mechanism and an isolation mechanism, wherein the distal end of the traction mechanism is provided with an inner hole, and the isolation mechanism is arranged outside the distal end of the inner hole;

[0008] A clamping device, comprising a tightening tube and a clamp assembly; the tightening tube is provided with a first locking portion; the clamp assembly is partially arranged inside the tightening tube and comprises a clip and a coupling portion; the clip is arranged on the coupling portion, and the proximal end of the clip is provided with a second locking portion for connecting with the first locking portion; wherein the proximal end of the coupling portion is inserted into the inner hole and has an interference fit with the inner hole, and the isolation mechanism prevents the second locking portion from connecting with the first locking portion, so as to allow the traction mechanism to drive the clamp assembly to move along the axial direction of the tightening tube under the action of an external force, so that the clamp assembly switches between a closed state and an open state; and,

[0009] A first limiting portion, used to limit the maximum distance that the clamp assembly moves in a direction close to the proximal end of the tightening tube;

[0010] The hemostatic clip is configured such that when the clamp assembly is in the closed state and the first limit portion prevents the clamp assembly from continuing to move in the direction close to the proximal end of the tightening tube, and the traction mechanism is subjected to a pulling force greater than a first predetermined value, the proximal end of the engaging portion disengages from the inner hole, and at the same time the isolation mechanism releases the constraint on the proximal end of the clip, so that the second locking portion is connected to the first locking portion.

[0011] Optionally, the isolation mechanism includes a first retaining wall, which extends axially along the traction mechanism; there are two first retaining walls, which are symmetrically arranged in the circumferential direction of the inner hole and are used to constrain the proximal end of the clip to the inner side of the first retaining wall to isolate the second locking portion and the first locking portion.

[0012] Optionally, the clamping device also includes a second limiting portion, which is arranged on the tightening tube and located on the distal side of the engaging portion, and is used to limit the maximum distance that the clamp assembly can move in a direction away from the proximal end of the tightening tube, so as to prevent the clamp assembly from escaping from the distal end of the tightening tube.

[0013] Optionally, the first locking portion includes a locking hole arranged on the tube wall of the tightening tube; the second locking portion includes a clamping block;

[0014] The second limiting portion is also used to limit the relative position of the clamp assembly and the tightening tube in the circumferential direction so that the clamping block can be clamped into the locking hole.

[0015] Optionally, the second limiting portion extends in the radial direction of the tightening tube and forms two channels with the tube wall of the tightening tube;

[0016] The number of the clips is two, and the distal end of one of the clips passes through one of the channels to extend out from the distal end of the tightening tube.

[0017] Optionally, the second limiting portion includes a pin; or the second limiting portion includes two second retaining walls disposed at the distal end of the tightening tube, and the two second retaining walls are symmetrically arranged in the circumferential direction of the tightening tube.

[0018] Optionally, the hemostatic clip further comprises a receiving sleeve assembly, which is detachably connected to the proximal end of the tightening tube, communicates with the tightening tube, and is configured to be rotatable relative to the tightening tube; the traction device is partially disposed inside the receiving sleeve assembly and is capable of moving along the axial direction of the receiving sleeve assembly;

[0019] The hemostatic clip is configured such that the traction mechanism can drive the clamp assembly to rotate around the axis of the traction mechanism under the action of an external force, while the tightening tube rotates.

[0020] Optionally, the first limiting portion includes a first limiting surface and a second limiting surface, and the first limiting surface is arranged on the engaging portion and is used to abut against the second limiting surface;

[0021] A first step surface is formed on the outer wall of the tightening tube, and a second limit surface is formed on the inner wall of the tightening tube; a first connecting hole is also provided on the tightening tube, and the first connecting hole is located at the proximal side of the first step surface and the second limit surface;

[0022] The hemostatic clip also includes an elastic connector; the elastic connector includes a base and a rod, the base is arranged inside the socket assembly, and a through hole for the traction mechanism to pass through is opened on the base; the rod is arranged on a side of the base close to the distal end of the socket assembly and extends along the axial direction of the socket assembly, and a bending wing is formed at the distal end of the rod; the bending wing passes through the first connecting hole and extends to the outside of the tightening tube;

[0023] The distal end of the socket assembly is formed with a third limiting portion protruding inwardly; the distal end of the socket assembly is sleeved on the proximal outer surface of the tightening tube, and the third limiting portion is constrained between the bending wing and the first step surface.

[0024] Optionally, the first limiting portion includes a first limiting surface and a second limiting surface, and the first limiting surface is arranged on the engaging portion and is used to abut against the second limiting surface;

[0025] A second step surface is formed on the distal outer wall of the socket assembly, and a second connecting hole is also provided on the socket assembly, and the second connecting hole is located at the distal side of the second step surface;

[0026] The hemostatic clip further comprises an elastic connector; the elastic connector comprises a base and a rod, the base is arranged inside the receiving sleeve assembly, and a through hole for the traction mechanism to pass through is opened on the base; the rod is arranged on one side of the base close to the distal end of the receiving sleeve assembly and extends along the axial direction of the receiving sleeve assembly, and a bending wing is formed at the distal end of the rod; the bending wing passes through the second connecting hole and extends to the outside of the receiving sleeve assembly;

[0027] The proximal end of the tightening tube is formed with a fourth limiting portion protruding inwards;

[0028] The proximal end of the tightening tube is sleeved on the distal outer surface of the socket assembly, and the fourth limiting portion is constrained between the bending wing and the second step surface; at the same time, the distal end surface of the socket assembly is used to abut against the first limiting surface to form the second limiting surface.

[0029] Optionally, the traction mechanism comprises a core wire and a connecting tube; the core wire passes through the through hole; the connecting tube is arranged at the distal end of the core wire and has the inner hole, and the outer diameter of the proximal end of the connecting tube is larger than the aperture of the through hole;

[0030] The hemostatic clip is configured such that when the proximal end of the engaging portion escapes from the inner hole, the proximal end of the connecting tube abuts against the base, and the traction mechanism is subjected to a pulling force greater than a second predetermined value, the bending wing deforms to release the connection between the socket assembly and the tightening tube.

[0031] Optionally, the hemostatic clip further comprises a handle assembly, the handle assembly comprising a gripping portion, a sliding portion and a rotating portion; the gripping portion is provided with a slide groove extending in the axial direction; the sliding portion is arranged on the slide groove and can slide along the slide groove; the rotating portion is rotatably arranged on the distal end of the gripping portion; the proximal end of the traction mechanism passes through the proximal end of the socket assembly and further extends into the interior of the handle assembly to be connected with the sliding portion and the rotating portion of the handle assembly;

[0032] The hemostatic clip is configured such that when the sliding portion slides along the sliding groove, the sliding portion drives the traction mechanism to move axially along the sleeve assembly to drive the chuck assembly to move axially along the tightening tube; when the rotating portion rotates relative to the holding portion, the rotating portion drives the traction mechanism to rotate to drive the chuck assembly and the tightening tube to rotate.

[0033] Optionally, the traction mechanism includes a core wire, a connecting tube, a first connecting block and a second connecting block; wherein the connecting tube is arranged at the distal end of the core wire and has the inner hole; the first connecting block and the second connecting block are both arranged at the proximal end of the core wire, and the second connecting block is located on the proximal side of the first connecting block; the first connecting block is connected to the rotating part and is configured to rotate synchronously with the rotating part and can move relative to the rotating part in the axial direction; the second connecting block is connected to the sliding part and is configured to remain relatively stationary with the sliding part in the axial direction and can rotate relative to the sliding part in the circumferential direction; and / or,

[0034] The socket assembly includes an axially connected sleeve and a spring tube, the distal end of the sleeve is connected to the proximal end of the tightening tube, the proximal end of the spring tube is provided with a positioning tube, the positioning tube is located on the distal side of the first connecting block, and is connected to the rotating part of the handle assembly. The positioning tube is configured to remain relatively stationary with the rotating part in the axial direction and can rotate relative to the rotating part in the circumferential direction.

[0035] Compared with the prior art, the hemostatic clip of the present invention has the following advantages:

[0036] The aforementioned hemostatic clip comprises a traction device, a clamping device and a first limiting portion; the traction device comprises a traction mechanism and an isolation mechanism; the distal end of the traction mechanism is provided with an inner hole; the isolation is arranged outside the distal end of the inner hole; the clamping device comprises a tightening tube and a clamp assembly; the tightening tube is provided with a first locking portion; the clamp assembly is partially arranged inside the tightening tube and comprises a clip and a coupling portion; the clip is arranged on the coupling portion, and the proximal end of the clip is provided with a second locking portion for connecting with the first locking portion; wherein the proximal end of the coupling portion is inserted into the inner hole and has an interference fit with the inner hole, and the isolation mechanism prevents the second locking portion from connecting with the first locking portion to allow The traction mechanism allows the chuck assembly to move along the axial direction of the tightening tube under the action of external force, so that the chuck assembly switches between a closed state and an open state; the first limit portion is used to limit the maximum distance of the chuck assembly moving in the direction of the proximal end of the tightening tube; the hemostatic clip is configured so that when the chuck assembly is in the closed state and the first limit portion prevents the chuck assembly from continuing to move in the direction close to the proximal end of the tightening tube, and the traction mechanism is subjected to a tensile force greater than a first predetermined value, the proximal end of the engagement portion is disengaged from the inner hole, and the isolation mechanism releases the constraint on the proximal end of the clip, so that the second locking portion is connected to the first locking portion. The engagement portion is connected to the inner hole by interference fit, and the structure is simple. When the connection is released, only a tensile force that can overcome the interference fit force needs to be applied, and there will be no breakage of the structural components, and there will be no problem of broken components remaining in the body and entering the wound, which is safe and reliable. In particular, the isolation constrains the proximal end of the clamp so that the clamp assembly can reciprocate along the axial direction of the tightening tube, and the position of the clamp assembly is repeatedly adjusted to better clamp the target tissue. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention.

[0038] Figure 1 is a schematic diagram of the structure of the hemostatic clip provided according to the first embodiment of the present invention, in which the clamp assembly is in an open state;

[0039] Figure 2 is a schematic diagram of the structure of the hemostatic clip provided according to the first embodiment of the present invention, in which the clamp assembly is in a closed state;

[0040] Figure 3 is a partial structural schematic diagram of the hemostatic clip provided according to the first embodiment of the present invention;

[0041] Figure 4 is a partial cross-sectional view of the hemostatic clip provided by the first embodiment of the present invention;

[0042] Figure 5 is a partial cross-sectional view of the hemostatic clip provided according to the first embodiment of the present invention, Figure 4 and Figure 5 The cutting planes are different, and the pins and elastic connectors are not shown in the figure;

[0043] Figure 6 1 is a partial structural schematic diagram of the hemostatic clip provided according to the first embodiment of the present invention, in which the second locking portion is connected to the first locking portion;

[0044] Figure 7 It is a schematic diagram of the matching relationship between the connecting tube and the first retaining wall of the hemostatic clip provided in the first embodiment of the present invention;

[0045] Figure 8 is a partial schematic diagram of the hemostatic clip provided according to the first embodiment of the present invention, and mainly shows the proximal structure of the traction mechanism and the proximal structure of the socket assembly;

[0046] Fig. 9 1 is a schematic diagram of the matching relationship between the tightening tube and the second limiting portion of the hemostatic clip provided in accordance with the first embodiment of the present invention, wherein (a) is a schematic diagram of the second retaining wall not being bent, and (b) is a schematic diagram of the second retaining wall being bent to form the second limiting portion;

[0047] Fig.10 is a schematic structural diagram of a joint portion provided according to Embodiment 1 of the present invention;

[0048] Fig.11 1 is a schematic structural diagram of an elastic connector of a hemostatic clip provided in accordance with the first embodiment of the present invention;

[0049] Fig.12 is a schematic structural diagram of a handle assembly of a hemostatic clip provided in accordance with Embodiment 1 of the present invention;

[0050] Fig.13 is an exploded schematic diagram of a handle assembly of a hemostatic clip provided in accordance with the first embodiment of the present invention;

[0051] Fig.14 is a partial cross-sectional view of the hemostatic clip provided according to the second embodiment of the present invention;

[0052] Fig.15 is a partial cross-sectional view of the hemostatic clip provided according to the second embodiment of the present invention, Fig.15 The cross-section of Fig.14 The cross-sections are different, and the elastic connector is not shown in the figure;

[0053] Fig.16 It is a cross-sectional view of the tightening tube of the hemostatic clip provided in accordance with the first embodiment of the present invention. DETAILED DESCRIPTION

[0054] The following is an explanation of the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the present embodiment only illustrate the basic concept of the present invention in a schematic manner, and only the components related to the present invention are shown in the figure instead of being drawn according to the number, shape and size of the components in the actual implementation. The type, quantity and proportion of each component in the actual implementation can be a random change, and the component layout type may also be more complicated.

[0055] In addition, each embodiment of the following description has one or more technical features, but this does not mean that the user of the present invention must implement all the technical features in any embodiment at the same time, or can only implement part or all of the technical features in different embodiments separately. In other words, under the premise that implementation is possible, those skilled in the art can selectively implement part or all of the technical features in any embodiment according to the disclosure of the present invention and according to the design specifications or implementation requirements, or selectively implement a combination of part or all of the technical features in multiple embodiments, thereby increasing the flexibility of the implementation of the present invention.

[0056] As used in this specification, the singular forms "a", "an", and "the" include plural objects, and the plural form "plurality" includes more than two objects, unless the content clearly indicates otherwise. As used in this specification, the term "or" is generally used to include the meaning of "and / or", unless the content clearly indicates otherwise, and the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be a connection between the internal parts of two elements or an interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0057] In order to make the purpose, advantages and features of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0058] In this article, the terms "proximal" and "distal" refer to the relative orientation, relative position, and direction of components or actions relative to each other from the perspective of a doctor using the medical device. Although "proximal" and "distal" are not restrictive, "proximal" usually refers to the end of the medical device that is close to the doctor during normal operation, and "distal" usually refers to the end that first enters the patient's body.

[0059] Embodiment 1

[0060] Please refer to Figures 1 to 6 The present embodiment provides a hemostatic clip, which includes a traction device, a clamping device and a first limiting portion. The traction device includes a traction mechanism 1100 and an isolation mechanism. The distal end of the traction mechanism 1100 is provided with an inner hole 1101. In this embodiment, the isolation mechanism preferably includes a first retaining wall 1200, which is arranged outside the distal end of the inner hole 1101 and extends along the axial direction of the traction mechanism 1100. The clamping device includes a tightening tube 2100 and a clamp assembly 2200. The tightening tube 2100 is provided with a first locking portion. The clamp assembly 2200 is partially arranged inside the tightening tube 2100 and includes a clip 2210 and a joint 2220. The clip 2210 is arranged on the joint 2220, and the proximal end of the clip 2210 is provided with a second locking portion for connecting with the first locking portion. The proximal end of the engagement portion 2220 is inserted into the inner hole 1101 and is interference fit with the inner hole 1101, and the proximal end of the clip 2210 is constrained on the inner side of the first retaining wall 1200 to prevent the second locking portion from connecting with the first locking portion, thereby allowing the traction mechanism 1100 to drive the clamp assembly 2200 to move along the axial direction of the tightening tube 2100 under the action of external force, so that the clamp assembly 2200 switches between the closed state and the open state. The first limiting portion is used to limit the maximum distance that the clamp assembly 2200 moves in the direction close to the proximal end of the tightening tube 2100.

[0061] It should be noted that the first retaining wall 1200 extends along the axial direction of the traction mechanism 1100, including the situation that the first retaining wall 1200 is parallel to the axial direction of the traction mechanism 1100, and also including the situation that the first retaining wall 1200 forms an angle with the axis of the traction mechanism 1100 but can still limit the proximal end of the clip 2210 to the inner side of the first retaining wall 1200. The "inner side" refers to the side of the first retaining wall 1200 close to the axis of the traction mechanism 1100. The first retaining wall 1200 constrains the proximal end of the clip 2210 to its inner side, thereby isolating the second locking portion and the first locking portion and preventing the two from being connected.

[0062] It can be understood that there are two clips 2210. When the hemostatic clip is used to clamp the target tissue in the human body, the operator applies a pulling force to the traction mechanism 1100 at the proximal end of the traction mechanism 1100, so that the clamp assembly 2200 moves in a direction close to the proximal end of the tightening tube 2100, so that the tube wall of the tightening tube 2100 applies pressure to the clips 2210, so that the distal ends of the two clips 2210 approach each other, so that the clamp assembly 2200 can be switched to the closed state. Conversely, when the operator applies a thrust to the traction mechanism 1100, the clamp assembly 2200 moves in a direction away from the proximal end of the tightening tube 2100 until the tube wall of the tightening tube 2100 no longer applies pressure to the clips 2210, and the clamp assembly 2200 switches to the open state. The pulling force refers to the direction of the force from the distal end of the tightening tube 2100 to the proximal end, and the pushing force refers to the direction of the force from the proximal end of the tightening tube 2100 to the distal end. The “chuck assembly 2200 moves in a direction close to the proximal end of the tightening tube 2100” means that the movement direction of the chuck assembly 2200 is from the distal end of the tightening tube 2100 to the proximal end; the “chuck assembly 2200 moves in a direction away from the proximal end of the tightening tube 2100” means that the movement direction of the chuck assembly 2200 is from the proximal end of the tightening tube 2100 to the distal end.

[0063] When the chuck assembly 2200 is in the closed state, and the first limit portion prevents the chuck assembly 2200 from continuing to move in the direction close to the proximal end of the tightening tube 2100, the operator applies a pulling force greater than the first predetermined value to the traction mechanism 1100, so that the proximal end of the engagement portion 2220 is disengaged from the inner hole 1201, and at the same time, the first retaining wall 1200 releases the constraint on the proximal end of the clip 2210, so that the second locking portion is connected to the first locking portion. At this point, the chuck assembly 2200 is locked and maintained in the closed state. The "first predetermined value" is determined based on the interference fit force between the proximal end of the engagement portion 2220 and the inner hole 1201, as long as the pulling force applied to the traction mechanism 1100 is greater than the first predetermined value, the interference fit force can be overcome.

[0064] In the present embodiment, the engaging portion 2220 of the clamp assembly 2200 is interference fit with the traction mechanism 1100, and has a simple structure. When releasing the connection between the two, it is only necessary to apply a pulling force to the traction mechanism 1100 that can overcome the interference fit force. This is convenient and easy to operate, and there is no possibility of structural parts breaking, and there will be no problem of broken structures remaining in the body and entering the wound to cause inflammation, thereby improving the safety of use.

[0065] In this embodiment, the first limiting portion includes a first limiting surface and a second limiting surface, the first limiting surface is arranged on the joint portion 2220, and the second limiting surface is arranged on the inner wall of the tightening tube 2100 and is located on the proximal side of the first locking portion, for abutting against the first limiting surface.

[0066] The clamping device further includes a second limiting portion, which is disposed on the tightening tube 2100 and is located at the distal end side of the engaging portion 2220, and is used to restrict the maximum distance of the clamp assembly 2200 moving in a direction away from the proximal end of the tightening tube 2100, so as to prevent the clamp assembly 2200 from escaping from the distal end of the tightening tube 2100. In addition, the second limiting portion is also configured to limit the relative position of the clamp assembly 2200 and the tightening tube 2100 in the circumferential direction, so that the second locking portion is aligned with the first locking portion in the circumferential direction, so that the two can be smoothly connected.

[0067] Furthermore, the hemostatic clip further comprises a sleeve assembly 3000, which is detachably connected to the proximal end of the tightening tube 2100 and communicates with the tightening tube 2100. The traction device is partially arranged inside the sleeve assembly 3000 and can move along the axial direction of the sleeve assembly 3000. The "detachably connected" means that the sleeve assembly 3000 and the tightening tube 2100 can be disconnected under predetermined conditions. In addition, the sleeve assembly 3000 is also configured to be able to rotate relative to the tightening tube 2100, so that when the traction mechanism 1100 rotates under the action of external force, the clamp assembly 2200 and the tightening tube 2100 can be driven to rotate synchronously, so that the operator can adjust the position of the clamp assembly 2200 conveniently.

[0068] In addition, the hemostatic clip further includes a handle assembly 4000, which is used to connect with the proximal end of the traction mechanism 1000 and the proximal end of the socket assembly 3000. The operator can apply force to the traction mechanism 1100 by operating the handle assembly 4000, thereby driving the clamping device to perform various actions.

[0069] Next, this article will introduce in detail the structures of the various components of the hemostatic clip described in this embodiment and the assembly relationship between them in conjunction with the drawings.

[0070] Please refer to Figures 3 to 5, and in combination with 7, the traction mechanism 1100 includes a core wire 1110 and a connecting tube 1120. The connecting tube 1120 is arranged on the distal end of the core wire 1110, and has the inner hole 1101, and the outer diameter of the connecting tube 1120 is greater than the outer diameter of the core wire 1110. Preferably, the connecting tube 1120 includes a distal segment 1121 and a proximal segment 1122, the distal segment 1121 is cylindrical, and the proximal segment 1122 is a conical structure with a cross section gradually decreasing from the distal end to the proximal end, such as a cylindrical structure, which is convenient for connection with the core wire 1110. The inner diameter of the inner hole 1101 can be uniform, or the inner hole 1101 is set as a stepped hole.

[0071] The first retaining wall 1200 is disposed on the distal end of the connecting tube 1120. In one implementation, there are two first retaining walls 1200, which are symmetrically disposed in the circumferential direction of the connecting tube 1120, and one first retaining wall 1200 is used to limit the proximal end of one clip 2210 inside the clip 2210.

[0072] Please refer to Figure 8 , the traction mechanism 1100 also includes a first connection block 1130 and a second connection block 1140. The first connection block 1130 and the second connection block 1140 are both arranged at the proximal end of the core wire 1110, and the second connection block 1140 is located at the proximal side of the first connection block 1130. The first connection block 1130 has a non-rotational shape, for example, the cross section of the first connection block 1130 is a triangle, a quadrilateral, a regular hexagon, etc. The cross section of the second connection block 1140 can be circular. The first connection block 1130 and the second connection block 1140 are both connected to the handle assembly 4000, and the specific connection relationship will be described later. Preferably, the core wire 1110 includes a core wire body and a core wire sleeve coated on the outer surface of the core wire body. The purpose of setting the core wire sleeve is to reduce the friction force received by the traction mechanism 1100 when it moves along the axial direction of the socket assembly 3000, and reduce the probability of the core wire 1110 bending.

[0073] The traction mechanism 1100 further includes a reinforcing sleeve 1150, which is sleeved on the portion of the core wire 1100 between the first connection block 1130 and the second connection block 1140, and the axial ends of the reinforcing sleeve 1150 are respectively connected to the first connection block 1130 and the second connection block 1140. The reinforcing sleeve 1150 can increase the strength of the traction mechanism 1100 and reduce bending.

[0074] Please focus on Figures 3 to 5, the tightening tube 2100 may be a cylindrical structure and have a first inner cavity that is axially through, and the first inner cavity is used to load the chuck assembly 2200. The first locking portion includes a locking hole 2101 arranged on the tube wall of the tightening tube 2100. In this embodiment, the tightening tube 2100 includes a first segment and a second segment, wherein the first segment is located at the distal end side of the second segment, and the outer diameter of the first segment is greater than the outer diameter of the second segment, so that a first step surface 2102 is formed on the outer wall of the tightening tube 2100. Preferably, the locking hole 2101 is arranged at the proximal end of the first segment. The second segment is also provided with a first connecting hole 2103, that is, the locking hole 2101 is located at the distal end side of the first step surface 2102, and the first connecting hole 2103 is located at the proximal end side of the first step surface 2102. The first step surface 2102 and the first connecting hole 2103 are both used for matching and connecting with the socket assembly 3000, which will be described in detail later. A third step surface 2104 is formed on the inner wall of the tightening tube 2100 .

[0075] The second limiting portion is disposed at the distal end of the tightening tube 2100 and extends in the radial direction of the tightening tube 2100, and the second limiting portion and the tube wall of the tightening tube 2100 together form two channels 2105 (such as Fig. 9 Optionally, as shown in (b) in FIG. Figures 3 to 5 As shown, the second limiting portion includes a pin shaft 2300, and the axial ends of the pin shaft 2300 are respectively connected to the tube wall of the tightening tube 2100, so that two mutually isolated channels 2105 are formed between the pin shaft 2300 and the tube wall. Fig. 9 As shown, the second stop portion includes two second retaining walls 2106 disposed at the distal end of the tightening tube 2100. The two second retaining walls 2106 can be symmetrically disposed and abut against each other. During processing, a portion of the material can be cut from the complete pipe to form the two second retaining walls 2106. At this time, the portion of the pipe without the second retaining wall 2106 is used as the tightening tube 2100, and the second retaining wall 2106 extends along the axial direction of the tightening tube 2100. Then, a force is applied to the second retaining wall 2106 to bend toward the inner side of the tightening tube 2100 until it extends along the radial direction of the tightening tube 2100.

[0076] Fig.10 FIG. 2 shows a schematic diagram of the structure of the joint 2220. Fig.10As shown, the joint portion 2220 includes a first connecting shaft 2221, a third connecting block 2222 and a second connecting shaft 2223, the first connecting shaft 2221 and the second connecting shaft 2223 are respectively connected to the third connecting block 2222, and the first connecting shaft 2221 is perpendicular to the axial direction of the tightening tube 2100, and the axial ends of the first connecting shaft 2221 are respectively extended out of the third connecting block 2222 and are used to connect to the middle of the clip 2210 (such as Figure 3 and Figure 4 The third connecting block 2222 may be a block structure with rectangular surfaces, and its proximal surface is perpendicular to the axial direction of the tightening tube 2100. Of course, in other implementations, the surfaces of the third connecting block 2222 are not limited to rectangular, and may be other shapes, such as circular, elliptical, etc. The distal end of the second connecting shaft 2222 is connected to the third connecting block 2222 and is parallel to the axial direction of the tightening tube 2100. The proximal end of the second connecting shaft 2223 is used to be inserted into the inner hole 1101 of the traction mechanism 1100 and has an interference fit with the inner hole 1101.

[0077] like Figure 3 and Figure 4 As shown, the middle parts of the two clips 2210 are respectively connected to the axial ends of the first connecting shaft 2221, so that the distal end and the proximal end of the clip 2210 are both free ends. The clip 2210 is configured to be elastic, and a block 2211 is provided on the proximal outer surface of the clip 2210 to serve as the second locking portion. The "free end" refers to the distal end and the proximal end of the clip 2210 that are not fixed to other mechanisms. The "outer surface" refers to the surfaces of the two clips 2210 that are away from each other, that is, when they are assembled to the tightening tube 2100, the surface of the clip 2210 facing the inner wall of the tightening tube 2100.

[0078] When the clamp assembly 2200, the tightening tube 2200 and the traction device are assembled into one body, the distal ends of the two clips 2210 extend out of the tightening tube 2100 from the two channels 2105 at the distal end of the tightening tube 2200. At the same time, the proximal end of the third connecting shaft 2223 of the joint 2220 is inserted into the inner hole 1101 of the traction mechanism 1100, and the proximal ends of the two clips 2210 are respectively embedded in the inner side of the first retaining wall 1200 to isolate the block 2211 and the locking hole 2101. In this way, before the joint 2220 is separated from the traction mechanism 1100, the operator repeatedly applies a pushing force or a pulling force to the traction mechanism 1100 to switch the clamp assembly 2200 between the open state and the closed state. After the target tissue to be clamped enters between the two clamping pieces 2210, the operator continues to apply a pulling force to the traction mechanism 1100 to move the clamp assembly 2200 toward the proximal end of the tightening tube 2100 to clamp the target tissue. When the proximal surface of the third connecting block 2222 of the joint 2220 abuts against the third step surface 2104 of the tightening tube 2100, the clamp assembly 2200 cannot continue to move toward the direction close to the tightening tube 2100. In other words, the proximal surface of the third connecting block 2222 constitutes the first limiting surface, and the third step surface 2104 constitutes the second limiting surface. Then the operator continues to apply a pulling force greater than the first predetermined value to the traction mechanism 1100 to overcome the interference fit force between the joint portion 2220 (specifically the second connecting shaft 2223) and the inner hole 1101, so that the traction mechanism 1100 and the joint portion 2220 are separated from each other, and at the same time, the first retaining wall 1200 releases the restriction on the proximal end of the clip 2210, and the block 2211 at the proximal end of the clip 2210 is inserted into the locking hole 2101, so that the clamp assembly 2200 is locked. It can be understood that due to the existence of the second limiting portion, the clamp assembly 2200 can basically only move along the axial direction of the tightening tube 2100 without circumferential rotation, so that the locking hole 2101 and the block 2211 are aligned in the circumferential direction and can be connected smoothly.

[0079] Please refer back to Figures 1 to 5 The socket assembly 3000 has an axially connected second inner cavity, and the second inner cavity is used to load the traction device. The socket assembly 3000 includes a sleeve 3100, and in this embodiment, the distal end of the sleeve 3100 forms a third annular stopper 3101 protruding radially inward. The third stopper 3101 is used to cooperate with the tightening tube 2100.

[0080] Specifically, the hemostatic clip further includes an elastic connecting member 5000 (such as Figure 3, Figure 4 and Fig.11 As shown), the elastic connector 5000 includes a base 5100 and a rod 5200. The base 5100 is disposed in the second inner cavity of the socket assembly 3000, and is further provided with a through hole 5110. The aperture of the through hole 5110 is greater than or equal to the outer diameter of the core wire 1110, and is smaller than the outer diameter of the connecting tube 1120, so that the base 5100 is sleeved on the outer surface of the core wire 1110 of the traction device. The rod 5200 is disposed on one side of the base 5100 close to the distal end of the socket assembly 3000, and extends along the axial direction of the socket assembly 3000. The distal end of the rod 5200 is formed with a bending wing 5210 that is bent outward, and the bending angle of the bending wing 5210 is 90°-120° (i.e. Fig.11 The angle α shown in the figure). The bending wing 5210 passes through the first connecting hole 2103 on the tightening tube 2100 to extend out of the tightening tube 2100, and forms a limiting groove between the first step surface 2102. When the distal end of the sleeve 3100 is sleeved on the outer surface of the second segment of the tightening tube 2100, the third limiting portion 3101 of the sleeve 3100 is set at the limiting groove (that is, the third limiting portion 3101 is constrained between the bending wing 5210 and the first step surface 2102), so that the socket assembly 3000 is connected to the tightening tube 2100, and the two can rotate relative to each other. Based on this structure, when the bending wing 5210 is deformed under the action of external force and comes out of the first connecting hole 2103, the connection between the socket assembly 3000 and the tightening tube 2100 can be released.

[0081] Furthermore, please combine Figure 1 , Figure 2 and Figure 8 As shown, the socket assembly 3000 further includes a spring tube 3200. The distal end of the spring tube 3200 is connected to the proximal end of the sleeve 3100, and the proximal end of the spring tube 3200 is provided with a positioning tube 3210, the cross section of the positioning tube 3210 may be circular, and is used to connect with the handle assembly 4000.

[0082] Next, please continue to refer to Figure 1 , Figure 2 and Fig.12, the handle assembly 4000 includes a gripping portion 4100, a sliding portion 4200 and a rotating portion 4300. The gripping portion 4100 is provided with a slide groove 4110 extending in the axial direction, and the sliding portion 4200 is connected to the slide groove 4110 and can slide along the slide groove 4110. The rotating portion 4300 is rotatably arranged at the distal end of the gripping portion 4100. The proximal end of the traction mechanism 1100 (i.e., the proximal end of the core wire 1110) passes through the proximal end of the socket assembly 3000 (so that the first connecting block 1130 is located on the proximal side of the positioning tube 3210), and is respectively connected to the sliding portion 4200 and the rotating portion 4300 of the handle assembly 4000. Furthermore, the hemostatic clip is configured such that when the sliding portion 4200 slides along the slide groove 4110, the sliding portion 4200 drives the traction mechanism 1000 to move axially along the socket assembly 3000. When the rotating portion 4300 rotates relative to the gripping portion 4100, the rotating portion 4300 drives the traction mechanism 1100 to rotate.

[0083] Please refer to Fig.13 The rotating part 4300 is provided with a first limiting cavity 4301 and a second limiting cavity 4302, and the sliding part 4200 is provided with a third limiting cavity 4201. The first limiting cavity 4301, the second limiting cavity 4302 and the third limiting cavity 4201 are connected to each other. The cross-sections of the first limiting cavity 4301 and the third limiting cavity 4201 can be circular, and the cross-section of the second limiting cavity 4302 matches the cross-section of the first connecting block 1300. The positioning tube 3210 of the spring tube 3200 is arranged in the first limiting cavity 4301 and is configured to remain relatively stationary with the rotating part 4300 in the axial direction, and the rotating part 4300 can rotate relative to the positioning tube 3210 to prevent the socket assembly 3000 from being kinked when the traction mechanism 1100 rotates. The first positioning block 1130 of the traction mechanism 1000 is disposed in the second limiting cavity 4302 and is configured to be able to move axially in the second limiting cavity 4302 and also to be able to rotate synchronously with the rotating part 4300. The second positioning block 1140 of the traction mechanism 1100 is disposed in the third limiting cavity 4201 and is configured to remain relatively stationary with the sliding part 4200 in the axial direction and to be able to rotate relative to the sliding part 4200 in the circumferential direction to prevent the traction mechanism 1100 from being kinked when rotating.

[0084] In this embodiment, Fig.13As shown, preferably, the gripping portion 4100 , the sliding portion 4200 and the rotating portion 4300 are all assembled structures, so as to facilitate the assembly of the handle assembly 4000 , the traction mechanism 1000 and the socket assembly 3000 .

[0085] The following describes the method for using the hemostatic clip described in this embodiment.

[0086] After delivering the hemostatic clip to the target position in the body, the operator manipulates the sliding portion 4200 of the handle assembly 4000 to slide in the slide groove 4110 to drive the traction mechanism 1100 to move axially along the sleeve assembly 3000, thereby driving the chuck assembly 2200 to move axially along the tightening tube 2100; and the operator also manipulates the rotating portion 4300 to rotate relative to the holding portion 4100 to drive the clamping device (i.e., the chuck assembly 2200 and the tightening tube 2100) to rotate, so as to adjust the posture of the chuck assembly 2200 until the target tissue enters between the two clips 2210.

[0087] Next, the operator applies a pulling force to the sliding portion 4200 to pull back the sliding portion 4200, so that the traction mechanism 1100 drives the clamp assembly 2200 to move in a direction close to the proximal end of the tightening tube 2100, until the distal end surface of the third connecting block 2222 of the joint 2220 abuts against the third step surface 2104 of the tightening tube 2100.

[0088] Next, the operator increases the pulling force to be greater than the first predetermined value to overcome the interference fit force between the proximal end of the coupling portion 2220 (i.e., the proximal end of the second connecting shaft 2223) and the inner hole 1101 of the traction mechanism 1100, so that the coupling portion 2220 and the traction mechanism 1100 are disengaged from each other. At the same time, the first retaining wall 1200 releases the constraint on the proximal end of the clip 2210, so that the block 2211 is inserted into the locking hole 2101 to lock the chuck assembly 2200.

[0089] Next, the operator continues to pull back the sliding portion 4200 until the connecting tube 1120 of the traction mechanism 1100 abuts against the base 5100 of the elastic connecting member 5000 .

[0090] Next, the operator continues to apply a pulling force greater than a second predetermined value, and the connecting tube 1120 transmits the pulling force to the elastic connecting member 5000, so that the bending wing 5210 is deformed and disengaged from the first connecting hole 2103, thereby releasing the connection between the socket assembly 3000 and the tightening tube 2100. The second predetermined value is determined according to the material of the elastic connecting member 5000, and as long as the pulling force greater than the second predetermined value can deform the bending wing 5210, it is sufficient.

[0091] Finally, the operator continues to pull back the sliding portion 4200 to withdraw the socket assembly 3000 and the traction device 1000 from the body.

[0092] Embodiment 2

[0093] Please refer to Fig.14 and Fig.15 The difference between this embodiment and the first embodiment is that the distal end of the sleeve 3100 is inserted into the first inner cavity of the tightening tube 2100 from the proximal end of the tightening tube 2100, and the distal end surface 3101 of the sleeve 3100 constitutes the second limiting surface.

[0094] Specifically, a fourth limiting portion 2107 protruding radially inward is formed at the distal end of the tightening tube 2100. The sleeve 3100 includes a third segment and a fourth segment, the third segment is located at the distal end side of the fourth segment, and the outer diameter of the third segment is smaller than the outer diameter of the fourth segment, so as to form a second step surface 3102 on the outer wall of the sleeve 3100. A second connecting hole 3103 is also provided on the third segment of the sleeve 3100 (that is, the second connecting hole 3103 is located at the distal end side of the second step surface 3102). The bending wing 5210 of the elastic connector 5000 passes through the second connecting hole 3103 and extends out of the sleeve 3100. By inserting the proximal end of the tightening tube 2100 onto the outer surface of the third segment of the sleeve 3100 and limiting the fourth limiting portion 2107 between the bending wing 5210 and the second step surface 3102, the connection between the socket assembly 3000 and the tightening tube 2100 can be achieved, and the two can rotate relative to each other.

[0095] Similar to the first embodiment, when the proximal surface of the third connection block 2222 of the joint portion 2220 abuts against the distal end surface 3101 of the sleeve 3100, the operator applies a pulling force greater than the first predetermined value to the traction mechanism 1100 by manipulating the sliding portion 4200 of the handle assembly 4000, so that the connection tube 1120 and the joint portion of the clamp assembly 2220 can be separated, and the restraint of the proximal end of the clip 2210 by the isolation mechanism can be released, so that the clamp block 2211 can be clamped into the locking hole 2101. And when the operator applies a pulling force greater than the second predetermined value to the traction mechanism 1100, the bending wing 5210 can be deformed to release the connection between the socket assembly 3000 and the tightening tube 2100.

[0096] Optionally, in one implementation, the tightening tube 2100 has a uniform inner diameter over its entire axial length, and a third annular retaining wall is disposed on the proximal end of the tightening tube 2100, and the third retaining wall constitutes the fourth limiting portion (not shown in the figure). Fig.16 As shown, an annular groove 2108 is provided on the inner wall of the proximal end of the tightening tube 2100 , and the inner wall of the tightening tube 2100 located on the proximal side of the annular groove 2108 constitutes the fourth limiting portion 2107 .

[0097] Although the present invention is disclosed as above, it is not limited thereto. Those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A hemostatic clip, characterized in that: include: The traction device comprises a traction mechanism and an isolation mechanism, wherein the distal end of the traction mechanism is provided with an inner hole, and the isolation mechanism is arranged outside the distal end of the inner hole; A clamping device, comprising a tightening tube and a clamp assembly; the tightening tube is provided with a first locking portion; the clamp assembly is partially arranged inside the tightening tube and comprises a clip and a coupling portion; the clip is arranged on the coupling portion, and the proximal end of the clip is provided with a second locking portion for connecting with the first locking portion; wherein the proximal end of the coupling portion is inserted into the inner hole and has an interference fit with the inner hole, and the isolation mechanism prevents the second locking portion from connecting with the first locking portion, so as to allow the traction mechanism to drive the clamp assembly to move along the axial direction of the tightening tube under the action of an external force, so that the clamp assembly switches between a closed state and an open state; and, A first limiting portion, used to limit the maximum distance that the clamp assembly moves in a direction close to the proximal end of the tightening tube; The hemostatic clip is configured such that when the clamp assembly is in the closed state and the first limit portion prevents the clamp assembly from continuing to move in the direction close to the proximal end of the tightening tube, and the traction mechanism is subjected to a pulling force greater than a first predetermined value, the proximal end of the engaging portion disengages from the inner hole, and at the same time the isolation mechanism releases the constraint on the proximal end of the clip, so that the second locking portion is connected to the first locking portion.

2. The hemostatic clip according to claim 1, characterized in that: The isolation mechanism includes a first blocking wall, which extends axially along the traction mechanism; there are two first blocking walls, which are symmetrically arranged in the circumferential direction of the inner hole and are used to constrain the proximal end of the clip to the inner side of the first blocking wall to prevent the second locking portion from being connected to the first locking portion.

3. The hemostatic clip according to claim 1, characterized in that: The clamping device also includes a second limiting portion, which is arranged on the tightening tube and located on the distal side of the engaging portion, and is used to limit the maximum distance that the clamp assembly can move in a direction away from the proximal end of the tightening tube to prevent the clamp assembly from escaping from the distal end of the tightening tube.

4. The hemostatic clip according to claim 3, characterized in that: The first locking portion includes a locking hole arranged on the tube wall of the tightening tube; the second locking portion includes a clamping block; The second limiting portion is also used to limit the relative position of the clamp assembly and the tightening tube in the circumferential direction so that the clamping block can be clamped into the locking hole.

5. The hemostatic clip according to claim 4, characterized in that: The second limiting portion extends in the radial direction of the tightening tube and forms two channels with the tube wall of the tightening tube; The number of the clips is two, and the distal end of one of the clips passes through one of the channels to extend out from the distal end of the tightening tube.

6. The hemostatic clip according to claim 5, characterized in that: The second limiting portion includes a pin; or the second limiting portion includes two second retaining walls arranged at the distal end of the tightening tube, and the two second retaining walls are symmetrically arranged in the circumferential direction of the tightening tube.

7. The hemostatic clip according to claim 4, characterized in that: The hemostatic clip further comprises a receiving sleeve assembly, which is detachably connected to the proximal end of the tightening tube, communicates with the tightening tube, and is configured to be rotatable relative to the tightening tube; the traction device is partially disposed inside the receiving sleeve assembly and is capable of moving along the axial direction of the receiving sleeve assembly; The hemostatic clip is configured such that the traction mechanism can drive the clamp assembly to rotate around the axis of the traction mechanism under the action of an external force, while the tightening tube rotates.

8. The hemostatic clip according to claim 7, characterized in that: The first limiting portion includes a first limiting surface and a second limiting surface, the first limiting surface is arranged on the joint portion and is used to abut against the second limiting surface; a first step surface is formed on the outer wall of the tightening tube, and the second limiting surface is formed on the inner wall of the tightening tube; a first connecting hole is also arranged on the tightening tube, and the first connecting hole is located at the proximal side of the first step surface and the second limiting surface; The hemostatic clip also includes an elastic connector; the elastic connector includes a base and a rod, the base is arranged inside the socket assembly, and a through hole for the traction mechanism to pass through is opened on the base; the rod is arranged on a side of the base close to the distal end of the socket assembly and extends along the axial direction of the socket assembly, and a bending wing is formed at the distal end of the rod; the bending wing passes through the first connecting hole and extends to the outside of the tightening tube; The distal end of the socket assembly is formed with a third limiting portion protruding inwardly; the distal end of the socket assembly is sleeved on the proximal outer surface of the tightening tube, and the third limiting portion is constrained between the bending wing and the first step surface.

9. The hemostatic clip according to claim 7, characterized in that: The first limiting portion includes a first limiting surface and a second limiting surface, wherein the first limiting surface is arranged on the joint portion and is used to abut against the second limiting surface; A second step surface is formed on the distal outer wall of the socket assembly, and a second connecting hole is also provided on the socket assembly, and the second connecting hole is located at the distal side of the second step surface; The hemostatic clip further comprises an elastic connector; the elastic connector comprises a base and a rod, the base is arranged inside the receiving sleeve assembly, and a through hole for the traction mechanism to pass through is opened on the base; the rod is arranged on one side of the base close to the distal end of the receiving sleeve assembly and extends along the axial direction of the receiving sleeve assembly, and a bending wing is formed at the distal end of the rod; the bending wing passes through the second connecting hole and extends to the outside of the receiving sleeve assembly; The proximal end of the tightening tube is formed with a fourth limiting portion protruding inwards; The proximal end of the tightening tube is sleeved on the distal outer surface of the socket assembly, and the fourth limiting portion is constrained between the bending wing and the second step surface; at the same time, the distal end surface of the socket assembly is used to abut against the first limiting surface to form the second limiting surface.

10. The hemostatic clip according to claim 8 or 9, characterized in that: The traction mechanism comprises a core wire and a connecting tube; the core wire passes through the through hole; the connecting tube is arranged at the distal end of the core wire and has the inner hole, and the outer diameter of the proximal end of the connecting tube is larger than the aperture of the through hole; The hemostatic clip is configured such that when the proximal end of the engaging portion escapes from the inner hole, the proximal end of the connecting tube abuts against the base, and the traction mechanism is subjected to a pulling force greater than a second predetermined value, the bending wing deforms to release the connection between the socket assembly and the tightening tube.

11. The hemostatic clip according to claim 7, characterized in that: The hemostatic clip further comprises a handle assembly, which comprises a gripping portion, a sliding portion and a rotating portion; the gripping portion is provided with a slide groove extending in the axial direction; the sliding portion is arranged on the slide groove and can slide along the slide groove; the rotating portion is rotatably arranged on the distal end of the gripping portion; the proximal end of the traction mechanism passes through the proximal end of the socket assembly and further extends into the interior of the handle assembly to be connected with the sliding portion and the rotating portion of the handle assembly; The hemostatic clip is configured such that when the sliding portion slides along the sliding groove, the sliding portion drives the traction mechanism to move axially along the sleeve assembly to drive the chuck assembly to move axially along the tightening tube; when the rotating portion rotates relative to the holding portion, the rotating portion drives the traction mechanism to rotate to drive the chuck assembly and the tightening tube to rotate.

12. The hemostatic clip according to claim 11, characterized in that: The traction mechanism comprises a core wire, a connecting tube, a first connecting block and a second connecting block; wherein the connecting tube is arranged at the distal end of the core wire and has the inner hole; the first connecting block and the second connecting block are both arranged at the proximal end of the core wire, and the second connecting block is located at the proximal end side of the first connecting block; the first connecting block is connected to the rotating part and is configured to rotate synchronously with the rotating part and can move relative to the rotating part in the axial direction; the second connecting block is connected to the sliding part and is configured to remain relatively stationary with the sliding part in the axial direction and can rotate relative to the sliding part in the circumferential direction; and / or, The socket assembly includes an axially connected sleeve and a spring tube, the distal end of the sleeve is connected to the proximal end of the tightening tube, the proximal end of the spring tube is provided with a positioning tube, the positioning tube is located on the distal side of the first connecting block, and is connected to the rotating part of the handle assembly. The positioning tube is configured to remain relatively stationary with the rotating part in the axial direction and can rotate relative to the rotating part in the circumferential direction.

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