阅读说明：本技术 一种止血夹用的夹头组件及止血夹 (Clamping head component for hemostatic clamp and hemostatic clamp ) 是由 寇鹏 宗林新 黎洁 张忠民 于 2020-05-27 设计创作，主要内容包括：本发明提供一种止血夹用的夹头组件及止血夹,其包括：套筒,套筒的一端内具有径向设置的挡位销,套筒的另一端具有内径小于套筒内径的缩口部；夹头,置于套筒内且可伸出套筒,夹头包括可张开和闭合的两个夹片,两个夹片分别置于挡位销的两侧,两个夹片具有通过销轴相连的连接部,且连接部上穿设销轴的孔为长孔；夹片的内侧壁具有第一导向面,在两个夹片张开或闭合过程中,第一导向面与挡位销接触导向。本发明通过第一导向面与挡位销接触导向,使两个夹片张开至最大,缩短了夹头的尺寸。(The invention provides a cartridge assembly for a hemostatic clip and a hemostatic clip, comprising: the sleeve is provided with a radially arranged stop pin in one end, and the other end of the sleeve is provided with a necking part with the inner diameter smaller than that of the sleeve; the clamping head is arranged in the sleeve and can extend out of the sleeve, the clamping head comprises two clamping pieces which can be opened and closed, the two clamping pieces are respectively arranged on two sides of the stop pin, the two clamping pieces are provided with connecting parts which are connected through a pin shaft, and a hole through which the pin shaft penetrates on the connecting parts is a long hole; the inside wall of clamping piece has first spigot surface, and in two clamping pieces opened or closed processes, first spigot surface and fender position pin contact direction. According to the invention, the first guide surface is in contact with the gear pin for guiding, so that the two clamping pieces are expanded to the maximum, and the size of the chuck is shortened.)

1. A cartridge assembly for a hemostatic clip, comprising: the sleeve is provided with a radially arranged stop pin in one end, and the other end of the sleeve is provided with a necking part with the inner diameter smaller than that of the sleeve; the clamping head is arranged in the sleeve and can extend out of the sleeve, the clamping head comprises two clamping pieces which can be opened and closed, the two clamping pieces are respectively arranged on two sides of the stop pin, the two clamping pieces are provided with connecting parts which are connected through a pin shaft, and a hole through which the pin shaft penetrates on the connecting parts is a long hole; the inner side walls of the clamping pieces are provided with first guide surfaces, and the first guide surfaces are in contact with the gear pins for guiding in the opening or closing process of the two clamping pieces; the pin shaft is pushed along the axial direction of the sleeve, so that the chuck is driven to move outwards of the sleeve, and the first guide surface is in contact with the gear pin for guiding, so that the two clamping pieces are expanded to the maximum; and pulling back the pin shaft along the axial direction of the sleeve to drive the chuck to move inwards to close the two clamping pieces, and if the connecting part is continuously pulled to move into the necking part, axially locking the chuck.

2. The cartridge assembly for a hemostatic clip of claim 1, wherein: the outer side wall of the clamping piece is provided with a second guide surface, the inner wall of the sleeve is provided with a protruding limiting part, and the second guide surface is in contact guiding with the limiting part in the movement process of the clamping piece.

3. The cartridge assembly for a hemostatic clip of claim 2, wherein: the connecting part is provided with a convex hook part which is contacted and limited with the limiting part in the movement process of the clamping piece.

4. The cartridge assembly for a hemostatic clip of claim 1, wherein: the first guide surface is an arc surface.

5. The cartridge assembly for a hemostatic clip of claim 1, wherein: the two clamping pieces are independent structures or connected integral structures.

6. The cartridge assembly for a hemostatic clip of claim 1, wherein: the connecting part is provided with a protruding hook part, and the necking part is provided with a protruding edge matched with the hook part.

7. A hemostatic clamp, which is characterized in that: the method comprises the following steps: a handle assembly, a tube assembly and a cartridge assembly for a hemostatic clip as set forth in any one of claims 1-6, the tube assembly including an outer sleeve and a zipper assembly disposed through the outer sleeve;

one end of the outer sleeve is connected with the handle assembly, and the other end of the outer sleeve is connected with the sleeve in the chuck assembly through the clamp spring; one end of the zipper assembly is connected with the handle assembly, the other end of the zipper assembly is connected with the pin shaft in the chuck assembly, and a breakable weak part is arranged at the connection position of the other end of the zipper assembly and the pin shaft.

8. The hemostatic clip of claim 7, wherein: the other end of the sleeve is provided with a clamping hole, the end part of the clamp spring is provided with a bending part, and the bending part is clamped in the clamping hole.

9. The hemostatic clip of claim 7, wherein: the outer sleeve is a spring tube.

10. The hemostatic clip of claim 7, wherein: the handle assembly comprises a handle rod and a handle arranged on the handle rod in a sliding mode, the handle rod is connected with the outer sleeve through a rotating nut, and the zipper assembly is connected with the handle rod and the handle; and the handle rod and the handle are provided with limiting components which are matched with each other and limit the axial direction of the handle.

Technical Field

The invention relates to the technical field of medical instruments, in particular to a clamping head component for a hemostatic clamp and the hemostatic clamp.

Background

In clinical medicine, the gastrointestinal system often causes bleeding due to diseases, accidental injuries, and injuries during treatment. Currently, the commonly used hemostasis methods include injection, medicine spraying, high-frequency electrocoagulation, laser and argon gas burning, and hemostasis by closing the bleeding position with a hemostatic clamp. The method for performing closed hemostasis on the bleeding position by using the hemostatic clamp has the advantages of small trauma, high hemostasis speed, low incidence rate of re-bleeding, few complications and definite curative effect, and is the most effective and clinically-applied method for non-operative treatment of gastrointestinal bleeding. The hemostatic clamp can also close mucosa injury of the alimentary canal to a certain degree to promote wound healing, and can also close a fistula with a small alimentary canal to avoid an open surgery.

Some hemostatic clamp products in the market cannot be opened again after being closed, and cannot be opened for repositioning when the clamp is positioned incorrectly, so that the operation difficulty is increased; some rotating performance is poor, and when the angle of the clamp needs to be adjusted in the operation process, the rotating performance is difficult to adjust due to poor torque transmission performance caused by the limitation of the structure of the clamp and the conveyor; in addition, some clips are too long to be left at the tail of the clip of a human body after being closed and released, are easy to cause discomfort of a patient in a narrow digestive tract, and have the risks of scratching the tissue wall of the digestive tract, perforating and causing secondary bleeding.

Therefore, there is a need for a hemostatic clamp that is small in size and easy to open and close for retention in the body.

Disclosure of Invention

In view of the above-mentioned disadvantages of the prior art, an object of the present invention is to provide a clip head assembly for a hemostatic clip and a hemostatic clip, which are used to solve the problems of the prior art that the size of the closed clip in the retention body is too large and the opening and closing of the retention body is not easy to be repeatedly adjusted.

To achieve the above and other related objects, the present invention provides a cartridge assembly for a hemostatic clip, comprising:

the sleeve is provided with a radially arranged stop pin in one end, and the other end of the sleeve is provided with a necking part with the inner diameter smaller than that of the sleeve;

the clamping head is arranged in the sleeve and can extend out of the sleeve, the clamping head comprises two clamping pieces which can be opened and closed, the two clamping pieces are respectively arranged on two sides of the stop pin, the two clamping pieces are provided with connecting parts which are connected through a pin shaft, and a hole through which the pin shaft penetrates on the connecting parts is a long hole; the inner side walls of the clamping pieces are provided with first guide surfaces, and the first guide surfaces are in contact with the gear pins for guiding in the opening or closing process of the two clamping pieces;

the pin shaft is pushed along the axial direction of the sleeve, so that the chuck is driven to move outwards of the sleeve, and the first guide surface is in contact with the gear pin for guiding, so that the two clamping pieces are expanded to the maximum; and pulling back the pin shaft along the axial direction of the sleeve to drive the chuck to move inwards to close the two clamping pieces, and if the connecting part is continuously pulled to move into the necking part, axially locking the chuck.

Preferably, the outer side wall of the clamping piece is provided with a second guide surface, the inner wall of the sleeve is provided with a protruding limiting part, and the second guide surface is in contact with the limiting part for guiding in the movement process of the clamping piece.

Preferably, the connecting part is provided with a convex hook part, and the hook part is in contact with the limiting part for limiting in the movement process of the clamping piece.

Preferably, the first guide surface is an arc surface.

Preferably, the two clamping pieces are independent structures or connected integral structures.

Preferably, the connecting part is provided with a protruding hook part, and the necking part is provided with a protruding edge matched with the hook part.

The present invention also provides a hemostatic clip, comprising: the handle assembly, the tube assembly and the chuck assembly for the hemostatic chuck as described in any one of the above, the tube assembly includes an outer sleeve and a zipper assembly arranged in the outer sleeve;

one end of the outer sleeve is connected with the handle assembly, and the other end of the outer sleeve is connected with the sleeve in the chuck assembly through the clamp spring; one end of the zipper assembly is connected with the handle assembly, the other end of the zipper assembly is connected with the pin shaft in the chuck assembly, and a breakable weak part is arranged at the connection position of the other end of the zipper assembly and the pin shaft.

Preferably, the other end of the sleeve is provided with a clamping hole, the end part of the clamp spring is provided with a bent part, and the bent part is clamped in the clamping hole.

Preferably, the outer sleeve is a spring tube.

Preferably, the handle assembly comprises a handle rod and a handle arranged on the handle rod in a sliding manner, the handle rod is connected with the outer sleeve through a rotating nut, and the zipper assembly is connected with the handle rod and the handle; and the handle rod and the handle are provided with limiting components which are matched with each other and limit the axial direction of the handle.

As described above, the cartridge assembly for a hemostatic clip and the hemostatic clip according to the present invention have the following advantageous effects: the first guide surface on the clamping piece is contacted with the stop pin, so that the guide of the chuck in the opening process is realized, and the stable opening and closing clamping is facilitated; in addition, the gear pin is in contact with the first guide surface, and the gear pin helps the two clamping pieces to be opened to the maximum angle, so that the length of the two clamping pieces is effectively shortened, the length of the clamping head remained in the body is shortened, and the clamping head is convenient to use.

Drawings

Fig. 1 is a view of an embodiment of the hemostatic clamp of the present invention.

Figure 2 is a diagram of one embodiment of a clip in the chuck assembly.

Fig. 3 is a perspective view of the collet assembly in an open position.

Fig. 4 is a plan view of fig. 3.

Fig. 5 is a perspective view of the closed state of the jaw assembly.

Fig. 6 is a plan view of fig. 5.

FIG. 7 shows the jaw assembly in a closed locked position.

Figure 8 is a schematic view of the connection of the collet assembly to the tube assembly.

Fig. 9 is a view showing a state in which the coupling pin is stopped in the cartridge assembly.

Fig. 10 shows a state in which the chuck assembly is separated from the zipper assembly.

Fig. 11 shows a schematic end view of a pull shaft in a zipper assembly.

Figure 12 shows the chuck assembly separated from the tube assembly.

Fig. 13 shows a schematic view of a handle assembly.

Fig. 14 shows an embodiment of the axial locking of the handle lever and the handle.

Fig. 15 shows another embodiment of the axial locking of the handle lever to the handle.

Description of the element reference numerals

1	Handle assembly
		11	Handle bar
11a	Positioning boss
		11b	Positioning rib
12	Handle (CN)
		13	Rotary nut
14	Protective tube
		15	Lock catch
15a	Clamp arm
		15b	Clamping groove
2	Outer sleeve
		21	Spring tube
22	Connecting pipe
		23	Connecting head
3	Chuck component
		31	Clamping piece
31a	First guide surface
		31b	Second guide surface
31c	Long hole
		31d	Hook part
32	Sleeve barrel
		32a、32b	Limiting part
32c	Necking part
		32d	Fastening hole
33	Pin shaft
		34	Gear pin
4	Zipper assembly
		41	Stretching rod
41a	Weakened portion
		42	Connecting pipe
43	Stretching shaft
		5	Clamp spring
5a	A bent part

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

Please refer to fig. 1 to 15. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions that the present disclosure can be implemented, so that the present disclosure is not limited to the technical essence, and any structural modifications, ratio changes, or size adjustments should still fall within the scope of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

For ease of description, the end of the handle assembly that is located is referred to herein as the proximal end, i.e., the end that is closer to the operator is the proximal end, and the end that is further from the handle assembly is referred to as the distal end.

As shown in fig. 1 to 15, the present invention provides a hemostatic clip, which includes: handle components 1, pipe assembly and cartridge subassembly 3, the pipe assembly includes outer tube 2 and wears to locate the interior zip fastener subassembly 4 of outer tube, through operation handle components 1, transmits cartridge subassembly 3 with moment of torsion and push-and-pull power through outer tube 2 and zip fastener subassembly 4, realizes rotation, repeated closure, lock of hemostatic clamp and release function. A core of the present embodiment is to design the clamping head assembly 3 of the hemostatic clamp to have a large opening angle and a small size.

As shown in fig. 2 and 7, the cartridge assembly 3 for a hemostatic clip of the present embodiment includes:

a sleeve 32, one end of the sleeve 32 is provided with a radially arranged gear pin 34, and the other end of the sleeve 32 is provided with a necking part 32c with the inner diameter smaller than that of the sleeve; the chuck is arranged in the sleeve 32 and can extend out of the sleeve 32, the chuck comprises two clamping pieces 31 which can be opened and closed, the two clamping pieces 31 are respectively arranged at two sides of the stop pin 34, the two clamping pieces 31 are provided with connecting parts which are connected through a pin shaft 33, and a hole through which the pin shaft 33 passes on the connecting parts is a long hole 31 c; the inner side wall of the clamping piece 31 is provided with a first guide surface 31a, and the first guide surface 31a is in contact with the stop pin 34 to guide in the opening or closing process of the two clamping pieces 31;

as shown in fig. 3 and 4, when the pin 33 is pushed in the axial direction of the sleeve 32, the collet is driven to move outward of the sleeve 32, and the first guide surface 31a is in contact with the stop pin 34 for guiding, so that the two clamping pieces 31 are expanded to the maximum; as shown in fig. 5 and 6, pulling back the pin 33 in the axial direction of the sleeve 32 brings the collet into the sleeve 32 to close the two jaws 31, and as shown in fig. 7, pulling on the connecting portion moves into the mouth portion 32c to lock the collet in the axial direction.

In this embodiment, the stop pin 34 is disposed in the sleeve 32, as shown in fig. 3 and 4, the first guide surface 31a is disposed on the inner side wall of the clip 31, and when the chuck 31 moves outward of the sleeve 32, the stop pin 34 is always in contact with the first guide surface 31a, so as to expand the two clips 31, and expand the two clips 31 to the maximum angle, that is, the two clips can be expanded to the maximum when the size of the clips is fixed, and accordingly, the size of the clips can be shortened when the expansion angle is fixed, that is, the size of the chuck left in the body can be reduced, and the use safety can be ensured.

Preferably, the first guide surface 31a is an arc surface, or may be another curved surface or a straight inclined surface, the first guide surfaces 31a on the two clamping pieces 31 are matched with the shift pin 34, and the shift pin 34 gives a resisting force to the two clamping pieces 31 to expand the two clamping pieces 31 to the maximum in the process that the two clamping pieces 31 extend out of the sleeve 32. The curved surface is arranged to be more attached to the cylindrical surface of the gear pin 34, so that the corresponding friction force is reduced, and the stability of the chuck extending out of the sleeve is improved.

In order to further limit the two clamping pieces, as shown in fig. 2 and 4, in this embodiment, the outer side wall of the clamping piece 31 is provided with a second guide surface 31b, the inner wall of the sleeve 32 is provided with protruding limiting parts 32a and 32b, the second guide surface 31b is in contact with the limiting parts 32a and 32b for guiding in the movement process of the clamping piece 31, the inner side of the bottom end of the connecting part of the clamping piece is provided with a protruding hook part 31d, and when the protruding hook part 31d on the two clamping pieces is in contact with the two limiting parts 32a and 32b for limiting, the two clamping pieces 31 are expanded to the maximum. In the embodiment, the second guide surface 31b is in contact with the limiting part and is matched with the first guide surface 31b, so that the clamping piece 31 reciprocates in a limiting channel formed by the gear pin 34 and the limiting parts 32a and 32b, the movement stability of the clamping piece is improved, and the two clamping pieces 31 are prevented from being dislocated in the clamping process; in addition, the hook part 31d is abutted against the limiting parts 32a and 32b, so that the two clamping pieces are axially limited, and the stability of the opening angle is ensured.

In this embodiment, the two clamping pieces 31 are independent structures and are respectively formed by machining, so as to facilitate the machining of the first guide surface and the second guide surface. The two clamping pieces 31 can also be of a connected integral structure, such as formed by bending a spring piece.

In order to ensure the locking of the chuck, in the present embodiment, a protruding hook portion 31d is provided on the connecting portion, and a protruding edge which is engaged with the hook portion 31d is provided at the throat portion 32c, as shown in fig. 7, in the present embodiment, by the protruding edge which forms the throat portion 32c being engaged with the hook portion 31d, after the hook portion 31d retracts to the throat portion 32c, the chuck is prevented from moving forward relative to the sleeve, that is, the chuck is prevented from opening, so that the chuck is in a locked state. When the chuck is locked, i.e., when the hook portion 31d is not retracted to the throat portion 32c, the two jaws in the chuck can be repeatedly opened and closed; and after locking, the chuck is in a permanent closed state.

To open and close the chuck and rotate the chuck assembly, as shown in fig. 1 and 8, the tube assembly of the present embodiment includes an outer tube 2 and a zipper assembly 4 inserted into the outer tube; one end of the outer sleeve 2 is connected with the handle component 1, and the other end of the outer sleeve 2 is connected with a sleeve in the chuck component 3 through a clamp spring 5; one end of the zipper assembly 4 is connected with the handle assembly 1, the other end of the zipper assembly 4 is connected with the pin 33 in the chuck assembly 3, and a breakable weak part 41a (shown in fig. 11) is arranged at the connection part of the other end of the zipper assembly 4 and the pin 33.

Specifically, as shown in fig. 8 and 13, in the present embodiment, the handle assembly 1 includes a handle bar 11 and a handle 12 slidably disposed on the handle bar 11, the handle bar 11 is connected to the outer sleeve 2 through a swivel nut 13, a protection tube 14 is disposed between the outer sleeve 2 and the swivel nut 13, and the zipper assembly 4 is connected to both the handle bar 11 and the handle 12; and the handle rod 11 and the handle 12 are provided with limiting components which are matched with each other to limit the axial direction of the handle 12. In the embodiment, the handle 12 is pushed to slide along the handle rod 11, and the push-pull force is transmitted to the two clamping pieces 1 in the chuck component 3 through the zipper component 4, so that the repeated closing, locking and releasing functions of the two clamping pieces are realized; the handle bar 11 and the handle 12 are rotatable relative to the swivel nut 13, and by rotating the handle bar 11, torque is transmitted to the two jaws 1 in the chuck assembly 3 through the fastener assembly 4, thereby rotating the chuck.

As shown in fig. 8 to 12, the zipper assembly 4 of the present embodiment includes a stretching rod 41, a connecting pipe 42 and a stretching shaft 43, one end of the stretching shaft 43 is connected to the handle assembly 1, the other end of the stretching shaft 43 is connected to the stretching rod 41 through the connecting pipe 42, the end of the stretching rod 41 has a connecting hole, and the pin 33 is inserted into the connecting hole to connect the chuck and the zipper assembly. In order to facilitate the separation of the chuck from the zipper assembly, the weak portion 41a is formed as a hole wall of the coupling hole, and is breakable by a certain pulling force, thereby facilitating the separation of the pin 33 from the coupling hole.

As shown in fig. 1, in the present embodiment, the outer sleeve 2 is formed by sequentially connecting a spring tube 21, a connecting tube 22 and a connector 23, and is mainly a spring tube.

Referring to fig. 9 to 12, in the present embodiment, the axial connection between the collet assembly 3 and the tube assembly is realized by the clamp spring 5, the other end of the sleeve 32 is provided with a clamp hole 32d, and the end of the clamp spring 5 is provided with a bent portion 5a, and the bent portion 5a is clamped in the clamp hole 32 d. The engagement of the snap hole 32d and the bent portion 5a provides for axial connection of the tube assembly to the collet assembly 3 and allows for rotation of the collet relative to the sleeve 32. When the handle assembly is pulled, the weak portion 41a is broken, the connecting rod 41 continues to move to contact with the snap spring 5, so that the bent portion 5a of the snap spring 5 is deformed under the pulling of the connecting rod 41 and is separated from the clamping hole 32d of the sleeve 32, and the release function of the chuck is realized, as shown in fig. 12.

In order to realize the axial limit of the handle rod 11 and the handle 12, one embodiment of the limit assembly is as follows: referring to fig. 15, in this embodiment, a positioning rib 11b is provided on the inner wall of the sliding slot of the handle bar 11 for sliding the handle 12, and a lock catch 15 with a slot 15 b is provided on the handle 12. After the clamp spring 5 is separated from the sleeve 32, the handle 12 is continuously pulled, so that the clamping groove 15 b on the lock catch 15 is clamped into the positioning rib 11b of the handle rod 11, the limit of the handle 12 is realized, and the handle 12 is prevented from moving towards the far end.

In order to realize the axial limit of the handle bar 11 and the handle 12, another embodiment of the limit assembly is as follows: referring to fig. 14, in the present embodiment, a positioning boss 11a is provided on the inner wall of the sliding groove of the handle bar 11 for sliding the handle 12, and a lock catch 15 of two parallel latch arms 15a is provided on the handle 12. After the clamp spring 5 is separated from the sleeve 32, the handle 12 is continuously pulled, so that the positioning boss 11a is clamped between the two parallel clamping arms 15a, the limit of the handle 12 is realized, and the handle 12 is prevented from moving towards a far end.

The specific working process of the hemostatic clamp in this embodiment may be as follows:

the handle 12 is pushed to the far end, the pushing force is transmitted to the long hole 31c of the clamping piece 31 through the zipper assembly 4, as shown in fig. 3 and fig. 4, the clamping piece 31 moves outwards (i.e. moves towards the far end) of the sleeve 32, after the first guide surface 31a of the clamping piece 31 contacts with the cylindrical surface of the stop pin 34, the two clamping pieces 31 are continuously opened outwards, in the process that the two clamping pieces 31 are opened outwards, the second guide surfaces 31b on the two clamping pieces 31 contact with the limiting parts 32a and 32b of the sleeve 32, and when the hook part 31d contacts with the limiting parts 32a and 32b, the clamping piece 31 stops moving and is in the maximum opening angle position.

The handle 12 can slide along the handle bar 11 as shown in fig. 13. Handle 12 is pulled proximally, pulling force is transmitted to pin 33 through pulling rod 41 of zipper assembly 4, pin 33 applies pulling force to slot 31c of clip 31, so that first guide surface 31a of clip 31 contacts with surface of stop pin 34, second guide surface 31b of clip 31 contacts with limiting portions 32a and 32b, and gradually contracts into sleeve 32, and the two clips 31 are closed, as shown in fig. 5 and 6.

The user can directly drive the chuck to rotate by rotating the handle rod 11 and transmitting the torque to the chuck through the zipper assembly 4.

The handle 12 is pulled continuously, the hook part 31d at the tail part of the clip 31 is retracted continuously under the action of the pulling force until the clip enters the necking part 32c of the sleeve, and the locking function of the clip 31 is realized, as shown in fig. 7. Before the locking function is not implemented, the repeated opening and closing of the chuck can be realized through the push-pull handle.

Continuing to pull handle 12, pin 33 is stopped by the ledge at the throat 32c of sleeve 32, causing clip 31 to stop moving, as shown in fig. 9.

Pulling on the handle 12 causes the weakened portion 41a of the connecting rod 41 to break away from the pin 33, as shown in fig. 10.

The handle 12 is continuously pulled to make the connecting rod 41 contact with the circlip 5, so that the bent portion 5a of the circlip 5 deforms under the pulling of the connecting rod 41 and is separated from the clamping hole 32d of the sleeve 32, and the releasing function of the chuck assembly 3 is realized, as shown in fig. 12.

The handle assembly 1 needs to perform the rotation and push-pull functions according to the application, and needs to have a size design so that the handle assembly 1 can conveniently rotate and push-pull while having sufficient strength. The outer diameter of the outer sleeve 2 is 0.8-3.0 mm, and the length of the part entering the endoscopic forceps channel is 500-2500 mm. The outer sleeve 2 adopts a spring structure, can bear coiling and bending, and can provide stretching force at the same time. The outer surface of the clamping head assembly is round and smooth, the clamping piece 31 has excellent elasticity, and meanwhile, the geometric design of proper bending size is carried out, so that the clamping piece 31 can freely enter and exit the sleeve 32. The zipper assembly 4 can bear coiling and bending, has excellent synchronous rotation performance, and can stably transmit torque. The weak part 41a of the stretching rod 41 is geometrically designed in size so that the stretching rod 41 is broken at 5-40N. The clamp spring 5 is connected with the chuck component 3 and the outer sleeve 2 and deforms or breaks when bearing 5-40N tensile force, so that the chuck component 3 is released.

In the aspect of materials, the materials of all the components are materials with good biocompatibility. The handle component 1 is one or a composite of several materials of PA, PEBAX, PE, PTFE, PP, PC, ABS, silica gel, PVC and PU. The inner surface and the outer surface of the part are smooth, and the functions of pushing, pulling and rotating are realized.

The outer sleeve 2 is of a spring structure, can well bear coiling and bending and provide certain tensile force, and the surface of the spring can be coated with a plastic film. The cross section of the spring can be round or rectangular.

The chuck component 3 is generally made of one or a plurality of materials of medical stainless steel and nickel-titanium alloy. Clip 31 has high elasticity and is capable of elastic deformation. The clamping piece has high hardness and can provide strong clamping force, namely the clamping piece clamps tissues after being locked and cannot fall off.

The clamp spring 5 is made of medical stainless steel or nickel-titanium alloy materials, and has the effects that when certain tensile force is elastically borne, the bending part can deform or break when the specified torque is reached, and the clamp head assembly is released.

Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.