CN110251186A - A chuck structure of tissue clip for endoscope - Google Patents

Abstract

A collet structure for tissue clips for endoscopes, belonging to the technical field of medical aids, in which the eccentric holes at the tail ends of two clamping arms are misaligned so that the positioning parts at the tail ends of the two clamping arms can also pass through the tail ends The left and right eccentric force of the misaligned round hole fixes the positioning piece in the positioning hole of the clamp seat to ensure the integrity of the closure and solve the phenomenon that the clamping arm is disengaged. Since the end of the clamp seat is also equipped with a tapered structure that gradually narrows, It can ensure that the movable pin shaft becomes tighter and tighter during the backward movement, ensures that the clamping arm is stable in the locked state, and will not be released and opened again, and can be conveniently rotated in the human body according to the operation angle. Compared with the structure of the clamp seat of some living body sampling forceps, the positioning hole and the curved hook are used to replace the convex structure in the inner wall of the traditional clamp seat. The structure of the present invention is simpler, the processing is easy, and the processing cost is low. The operation is convenient, the production difficulty is reduced, and the closure stability and use safety are further improved.

Description

A chuck structure of tissue clip for endoscope

technical field

The invention belongs to the technical field of medical aids, and relates to a tissue clip for an endoscope, in particular to a chuck structure of a tissue clip for an endoscope.

Background technique

In recent years, endoscopic tissue closure technology has become a surgical treatment for patients with acute digestive tract tissue wound surface repair and hemostasis due to its less traumatic, fast growth of tissue closure, low frequency of rebleeding, few complications, and definite curative effect. The most effective and most clinically applicable method. Endoscopic metal tissue clips are one of the more widely used means of tissue closure. Skilled operations on appropriate cases can effectively close tissue growth and prevent tissue re-tearing, reduce adverse reactions, and greatly improve the tearing rate of digestive tract tissue. The safety and effectiveness of endoscopic treatment of fissures and bleeding. The closing principle of the tissue clip is the same as that of surgical tissue suture or ligation. They are both physical and mechanical methods. The mechanical force generated when the tissue clip is closed is used to close and ligate the surrounding tissue and bleeding blood vessels, thereby closing the tissue and the bleeding site. To block the blood flow and close the tissue to achieve the purpose of closed growth, it is suitable for the treatment of non-varicose veins, active tissue tearing and bleeding, and visible tissue separation lesions after tissue closure and growth.

Chinese patent application number 201410222753.7 discloses a hemostatic clip. The clip body of the hemostatic clip is composed of two clamping arms. The tail ends of the two clamping arms are connected by movable pins. There is a chute, the fixed pin shaft passes through the chute, and the two clamping arms reciprocate along the chute to form the opening and closing of the clip body. When the pin shaft of the chute is in the pull structure, the two clamping arms are locked In the closed position, the end of the chute is provided with a bending structure. When the clamping arm moves so that the fixed pin is located in the bending structure, the clamping seat is provided with a protrusion matching the hook structure. When the two clamping arms When in the locked closed position, the hook structures at the tail ends of the two clamping arms are buckled on the protrusion, and the two clamping arms are in the locked closed position. If too much tissue is clamped, the curved hooks at the tail ends of the two clamping arms The hook structure cannot be buckled on the protrusion, and there will be a risk of falling off. The position of the protrusion on the holder is difficult to process, difficult to produce, and relatively high in cost. However, the existing tissue clips are inconvenient to place and fix the clips, so there is an urgent need to design a tissue clip that is easy to operate, safe to use, and stable and effective to close.

Contents of the invention

The purpose of the present invention is to solve the problem that when the existing hemostatic clamp clamps too much tissue, the hook structure at the tail end of the two clamping arms cannot be buckled on the protrusion, the clamping stability is poor, and there is a risk of falling off. The starting position is difficult to process, the production is difficult, and the production cost is high. A chuck structure for endoscope tissue clips is proposed, which can make it easy to operate, reduce production difficulty, and further improve closure stability and use safety. .

The technical solution of the present invention is: a collet structure of an endoscope tissue clip, comprising a fixed cap, a spring tube arranged at the tail end of the fixed cap, and a steel wire and a connecting rod arranged inside the spring tube and connected to the handle; It is characterized in that: the front end of the fixed cap is connected with a chuck main part, and the chuck main part is composed of a cylindrical clamp seat, a clamping arm, a steel wire buckle, a fixed pin shaft and a movable pin shaft, and the cylindrical clamp There are two U-shaped grooves in the vertical direction of the axis center of the front end of the seat, and the rear ends of the U-shaped grooves are respectively provided with a first positioning hole and a second positioning hole, and the fixed pin is arranged on the cylindrical clamp seat. In the horizontal direction of the axis of the front end, the fixed pin is provided with a first clamping arm and a second clamping arm, and the first clamping arm and the second clamping arm are opened and arranged in two U-shaped grooves , the heads of the first clamping arm and the second clamping arm are provided with occlusal ends, and the two bonding surfaces of the first clamping arm and the second clamping arm are respectively provided with a first chute and a The second chute, the inner tail end of the first clamping arm is provided with a first hook, the inner tail end of the second clamping arm is provided with a second hook, the tail of the first clamping arm A first eccentric hole is provided, and a second eccentric hole is provided at the tail of the second clamping arm. The first clamping arm and the second clamping arm are mirror-symmetrically arranged with the fixed pin axis as the center. The fixed pin The shaft is passed through the first chute and the second chute, the movable pin is set in the first eccentric hole and the second eccentric hole, and the wire buckle is set inside the cylindrical clamp seat, One end of the steel wire buckle is clamped with the movable pin shaft through a hook, and the other end of the steel wire buckle is connected with the connecting rod through a spring buckle, and the steel wire rope and the connecting rod are driven to move backward under the pulling of the handle. The connecting rod drives the wire buckle and the movable pin to move backward, and the movable pin drives the first clamping arm and the second clamping arm to close and move backward, and the movable pin moves to the limit position of the pin in the active position of the pin , the first hook on the first clamping arm is snapped into the first positioning hole, the second hook on the second clamping arm is snapped into the second positioning hole, and the tail end of the cylindrical clamping seat The inner wall is provided with a gradually narrowing tapered surface structure, and the movable pin shaft becomes tighter and tighter during the backward movement, so that the two clamping arms will not open again in the locked state.

The occlusal ends of the first clamping arm and the second clamping arm are engaged in a zigzag shape, and the heads of the two clamping arms are spherical after being closed.

The first eccentric hole and the second eccentric hole are arranged eccentrically and dislocated on the movable pin shaft. After the two clamping arms are closed, the hook structures of the respective clamping arms are tensioned and clamped into the positioning holes on the cylindrical clamping seat. , to obtain closure stability.

The inner diameters of the fixed cap and the spring tube are both larger than the maximum outer diameter of the steel thread buckle.

The side surfaces of the first clamping arm and the second clamping arm are gradually widened from the distal end to the proximal end.

Both the first chute and the second chute are composed of a straight groove part and an elbow part. When the two clamping arms merge, the straight groove parts on the two clamping arms intersect to form an angle, and the elbow parts overlap.

The beneficial effects of the present invention are: the chuck structure of a tissue clip for endoscope provided by the present invention improves the chuck structure of the traditional hemostatic clip, and forms the eccentric holes at the tail ends of the two clamping arms to form a dislocation fit, so that the two The positioning piece at the end of the clamping arm can also be fixed in the positioning hole of the clamp seat through the left and right eccentric force of the misaligned round hole at the end to ensure the integrity of the closure and solve the phenomenon of the clamping arm being disengaged. The end is also equipped with a gradually narrowing tapered surface structure, which can ensure that the movable pin shaft is getting tighter and tighter during the backward movement, ensuring that the clamping arm is stable in the locked state and will not be released again. It is convenient to rotate in the human body. Compared with the structure of the existing clamp seat of the living body sampling forceps, the present invention replaces the raised structure in the inner wall of the traditional clamp seat by the positioning hole and the crotch hook. The structure of the present invention is simpler, the processing is easy, the processing cost is low, the operation is convenient, the production difficulty is reduced, and the closure stability and use safety are further improved.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the use state of the present invention.

Fig. 2 is a schematic diagram of the structure of the chuck main part of the present invention in an opened state.

Fig. 3 is a schematic diagram of the closed state structure of the chuck main part of the present invention.

Fig. 4 is a schematic structural diagram of the state where the steel thread buckle and the movable pin are separated in the present invention.

Fig. 5 is a schematic top view of the structure of the present invention.

Fig. 6 is a schematic structural diagram of the clamping arm in the present invention.

In the figure: chuck main part 1, first clamping arm 1A, second clamping arm 1B, first chute 1C, second chute 1D, second hook 1E, first hook 1F, first eccentric Hole 1G, second eccentric hole 1H, cylindrical clamp seat 2A, first positioning hole 2B, second positioning hole 2C, tapered surface structure 2D, wire buckle 3, fixed cap 4, spring tube 5, fixed pin shaft 6, movable Pin 7, pin movable position 7A, pin limit position 7B, crotch 8, connecting rod 9, handle 10, steel wire rope 11, limit ring 12, spring buckle 13.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing:

As shown in Figures 1-6, a collet structure of an endoscope tissue clip includes a fixed cap 4, a spring tube 5 arranged at the tail end of the fixed cap 4, and a spring tube 5 arranged inside and connected to a handle 10 The steel wire rope 11 and the connecting rod 9; the front end of the fixed cap 4 is connected with a chuck main part 1, and the chuck main part 1 is composed of a cylindrical clamp seat 2A, a clamping arm, a steel wire buckle 3, a fixed pin shaft 6 and a movable pin shaft 7 connection structure, two U-shaped grooves are provided in the vertical direction of the front axis of the cylindrical clamp seat 2A, the rear ends of the U-shaped grooves are respectively provided with a first positioning hole 2B and a second positioning hole 2C, and the fixed pin shaft 6 is provided In the horizontal direction of the axis center of the front end of the cylindrical clamp seat 2A, the first clamping arm 1A and the second clamping arm 1B are arranged on the fixed pin shaft 6, and the first clamping arm 1A and the second clamping arm 1B are opened and set. In the two U-shaped grooves, the heads of the first clamping arm 1A and the second clamping arm 1B are provided with occlusal ends, and the two bonding surfaces of the first clamping arm 1A and the second clamping arm 1B are respectively A first chute 1C and a second chute 1D are provided, a first hook 1F is provided at the inner end of the first clamping arm 1A, and a second hook 1E is provided at the inner end of the second clamping arm 1B. The tail of the first clamping arm 1A is provided with a first eccentric hole 1G, and the tail of the second clamping arm 1B is provided with a second eccentric hole 1H. The first clamping arm 1A and the second clamping arm 1B are used to fix the pin shaft 6 It is set symmetrically in the mirror image of the center, the fixed pin shaft 6 is set in the first chute 1C and the second chute 1D, the movable pin 7 is set in the first eccentric hole 1G and the second eccentric hole 1H, and the wire buckle 3 is set in the Inside the cylindrical clamp seat 2A, one end of the steel wire buckle 3 is clamped with the movable pin 7 through the hook 8, and the other end of the steel wire buckle 3 is connected with the connecting rod 9 through the spring buckle 13, and the wire rope is driven under the pull of the handle 10. 11 and the connecting rod 9 move backward, the connecting rod 9 drives the wire buckle 3 and the movable pin shaft 7 to move backward, and the movable pin shaft 7 drives the first clamping arm 1A and the second clamping arm 1B to close and move backward , when the movable pin 7 moves to the pin limit position 7B at the pin active position 7A, the first hook 1F on the first clamping arm 1A snaps into the first positioning hole 2B, and the second clamping arm 1B The second hook 1E is clipped into the second positioning hole 2C, and the inner wall of the tail end of the cylindrical clamp seat 2A is provided with a tapered surface structure 2D that gradually narrows, and the movable pin shaft 7 becomes tighter and tighter during the backward movement. In order to prevent the two clamping arms from opening again in the locked state. The occlusal ends of the first clamping arm 1A and the second clamping arm 1B are matched in a zigzag shape, and the heads of the two clamping arms are spherical after they are closed. The first eccentric hole 1G and the second eccentric hole 1H are arranged eccentrically and dislocated on the movable pin shaft 7. After the two clamping arms are closed, the hook structures of the respective clamping arms are tensioned and clamped to the positioning on the cylindrical clamping seat 2A. inside the hole for closure stability. The inner diameters of the fixed cap 4 and the spring tube 5 are larger than the maximum outer diameter of the steel thread buckle 3 . The side surfaces of the first clamping arm 1A and the second clamping arm 1B are gradually widened from the distal end to the proximal end. Both the first chute 1C and the second chute 1D are composed of a straight groove part and an elbow part. When the two clamping arms merge, the straight groove parts on the two clamping arms intersect to form an angle, and the elbow parts overlap.

As shown in Figure 1-6, a kind of collet structure of endoscope tissue clip, the length of cylindrical holder 2 is equal to 5.3mm, can be conveniently used in the tissue of operating deeper part; There is a fixed pin shaft 6, the tail ends of the first clamping arm 1A and the second clamping arm 1B are connected by a movable pin shaft 7, and the middle parts of the two clamping arms are respectively provided with a first chute 1C and a second chute 1D , the occlusal ends of the two clamping arms cooperate in a zigzag shape, and reciprocate along the U-shaped groove on the cylindrical clamping seat 2 to form the opening and closing of the main part 1 of the chuck.

As shown in Figure 1, a collet structure of a tissue clip for an endoscope, the tail end of the spring tube 5 is provided with a limit ring 12 for preventing the operating handle 10 from slipping, which not only prevents the operating handle 10 from slipping from the cylindrical holder 2 It can also be hung up for storage when not in use.

As shown in Figure 2, a chuck structure of a tissue clip for an endoscope, the two clamping arms 1A, 1B are in an open state, at this time, the tissue clip can be aligned with the body tissue that needs to be clamped. The handle can be turned, thereby driving the rotation of the tissue clip body.

As shown in Figure 3, a chuck structure of a tissue clip for an endoscope, after identifying the tissue clamping position, move the handle backward to operate the wire rope 11, at this time, the two clamping arms 1A, 1B slide along the The track formed by groove 1C, 1D and fixed pin 7 retreats while closing. The ends of the chute 1C, 1D are provided with bending structures 1E, 1F. When the clamping arm moves so that the fixed pin 7 is located in the bending structure, it ensures that the two clamping arms 1A, 1B are closed when they move backward. At the same time lock the ends of the chute 1C, 1D. At the same time, the tail ends of the two clamping arms are provided with hook structures 1E, 1F, and the cylindrical clamp seat 2A is provided with positioning holes 2B, 2C adapted to the hook structures. When the two clamping arms are in the locked closed position At this time, the hook structures at the tail ends of the two clamping arms are buckled in the positioning holes, that is, at this position, the clamping arms 1A, 1B will not open again. The sides of the clamping arms 1A and 1B are gradually widened from the far end to the proximal end, which can increase the strength of the root of the tissue clip and ensure the reliability of normal use. The proximal end refers to the end close to the operating handle, and the distal end refers to the end near the One end of the target lesion.

As shown in Figure 4, a chuck structure of a tissue clip for an endoscope, the inner diameter of the fixed cap 4 and the inner diameter of the distal spring tube 5 are all greater than the maximum outer diameter of the wire buckle 3, so that the detached assembly can be Under the traction force of the steel wire rope 11, it enters into the far-end spring tube 5 to reduce the damage to the human body and the cavity of the endoscope. The ends of the clamping arms 1A, 1B are provided with hook structures 1E, 1F, and the clamping seat 2 is provided with positioning holes 2B, 2C adapted to the hook structures 1E, 1F; when the clamping arms 1A, 1B move so that the ends Hook structure When the hook structures 1E, 1F are buckled in the positioning holes 2B, 2C, the two clamping arms 1A, 1B are in the locked closed position, and the ends of the clamping arms 1A, 1B are provided with movable pin holes 1G, 1H, There is a relative deviation of 1mm between the pin hole and the center to ensure that when the clamping arms 1A, 1B are locked and closed, the hook structures 1E, 1F snap into the positioning holes 2B, 2C completely and will not fall off, thereby forming a double insurance. Ensure that the chuck main part 1 is stable in the locked state, and will not be suddenly released and opened again; the occlusal distal ends of the two clamping arms 1A and 1B are in a zigzag fit, so that the pliers ends of the two clamping arms are synchronously matched , to ensure the effectiveness of the clip body 1 after clamping; the occlusal distal ends of the two clamping arms 1A, 1B are closed to form a spherical end surface to protect the endoscope cavity; the front end 8 of the steel wire buckle 3 is wound around the movable pin 7, the movable pin shaft 7 passes through the end pin holes 1G, 1H of the clamping arms 1A, 1B, and when the tensile force applied on the steel wire buckle 3 reaches a predetermined value of 35-40N, the steel wire buckle 3 is straightened and aligned with the movable pin shaft 7 Disengaged, after the wire buckle 3 is separated from the movable pin shaft 7, the rear portion of the clip body 1 is fixed in the cylindrical holder 2; the fixed cap 4 is provided with a spring buckle 13, and the cylindrical holder 2 and the fixed cap 4 have mutual The overlapping parts are embedded, and the overlapping parts are provided with a slot that can accommodate the spring buckle 13; the spring buckle 13 connects the holder 2 with the fixed cap 4, and when the tension applied on the spring buckle 13 reaches 20 ~30N, the wire buckle 3 and the spring buckle 13 are deformed and straightened out of the slot, and the clamp seat 2 and the fixed cap 4 are separated from each other.

As shown in Figure 5, a chuck structure of a tissue clip for an endoscope, the tail end of the clip seat 2 is provided with a gradually narrowing structure to ensure that the movable pin shaft becomes tighter and tighter during the movement from 7a to 7b. , to ensure that the chuck main part 1 is stable in the locked state and will not be suddenly released and opened again. The holes 1G and 1H at the tail ends of the first and second clamping arms have eccentric structures to ensure that the positioning parts 1E and 1F are fixed after closing The hook structure of the clamp seat fits in the positioning hole, and it is not easy to fall off. The above chute 1C and 1D not only ensure the smooth movement of the chuck main part 1, but also ensure the product integrity and mechanical properties of the chuck main part 1 under stress, and meet the size requirements of the designed opening.

When in use, under the auxiliary monitoring function of the endoscope, the chuck main part 1 is transported to the designated target lesion position, the operating handle 10 is rotated to a suitable angle, and then the operation wire rope 11 is pulled backward, and the chuck main part 1 The torn tissue or blood vessel tissue is effectively clamped and separated from the fixing cap 4, and remains in the patient's body.

Claims (6)

1. the collet structure of a kind of tissue clip for endoscope, comprises fixed cap (4), is arranged on the spring tube (5) of fixed cap (4) tail end, and is arranged on spring tube (5) inside and handle ( 10) A connected steel wire rope (11) and a connecting rod (9); it is characterized in that: the front end of the fixed cap (4) is connected with a chuck main part (1), and the chuck main part (1) is composed of The cylindrical clamping seat (2A), the clamping arm, the wire buckle (3), the fixed pin (6) and the movable pin (7) are connected to form, and the vertical direction of the front end axis of the cylindrical clamping seat (2A) There are two U-shaped grooves, the rear ends of the U-shaped grooves are respectively provided with a first positioning hole (2B) and a second positioning hole (2C), and the fixed pin shaft (6) is arranged on the cylindrical clamp In the horizontal direction of the axis center of the front end of the seat (2A), the fixed pin shaft (6) is provided with a first clamping arm (1A) and a second clamping arm (1B), and the first clamping arm (1A) and the second clamping arm (1B) are opened and arranged in two U-shaped grooves, and the heads of the first clamping arm (1A) and the second clamping arm (1B) are provided with occlusal ends, and the A first chute (1C) and a second chute (1D) are respectively provided on the two bonding surfaces of the first clamping arm (1A) and the second clamping arm (1B), and the first clamping arm ( 1A) is provided with a first hook (1F) at the inner tail end, and a second hook (1E) is provided at the inner tail end of the second clamping arm (1B), and the first clamping arm (1A) The tail of the second clamping arm (1B) is provided with a first eccentric hole (1G), the tail of the second clamping arm (1B) is provided with a second eccentric hole (1H), the first clamping arm (1A) and the second clamping arm (1B) mirror-symmetrically arranged with the fixed pin shaft (6) as the center, the fixed pin shaft (6) passes through the first chute (1C) and the second chute (1D), and the movable pin The shaft (7) is arranged in the first eccentric hole (1G) and the second eccentric hole (1H), the steel thread button (3) is arranged in the inside of the cylindrical holder (2A), and the steel thread button (3) ) is clamped with the movable pin (7) through a hook (8), and the other end of the wire buckle (3) is connected with the connecting rod (9) through a spring buckle (13). The pulling of (10) drives the steel wire rope (11) and the connecting rod (9) to move backward, and the connecting rod (9) drives the steel wire buckle (3) and the movable pin (7) to move backward, and the movable pin (7) moves backward. ) drives the first clamping arm (1A) and the second clamping arm (1B) to close and move backwards, when the movable pin (7) moves to the pin limit (7B) at the pin active position (7A), The first hook (1F) on the first clamping arm (1A) is snapped into the first positioning hole (2B), and the second hook (1E) on the second clamping arm (1B) is snapped into the first positioning hole (2B). In the second positioning hole (2C), the inner wall of the tail end of the cylindrical clamp seat (2A) is provided with a tapered surface structure (2D) that gradually narrows, and the movable pin shaft (7) becomes tighter and tighter during the backward movement. In order to prevent the two clamping arms from opening again in the locked state. 2. The chuck structure of a tissue clip for endoscope according to claim 1, characterized in that: the occlusal ends of the first clamping arm (1A) and the second clamping arm (1B) are serrated Form fit, the heads of the two clamping arms are spherical after closing. 3. The chuck structure of a tissue clip for endoscope according to claim 1, characterized in that: the first eccentric hole (1G) and the second eccentric hole (1H) are eccentrically dislocated and arranged on the movable pin On the shaft (7), after the two clamping arms are closed, the hook structures of the respective clamping arms are tensioned and clamped in the positioning holes on the cylindrical clamping seat (2A), so as to obtain the stability of the closure. 4. The collet structure of a kind of tissue clamp for endoscope according to claim 1, characterized in that: the inner diameters of the fixed cap (4) and the spring tube (5) are greater than the maximum diameter of the wire buckle (3). outside diameter. 5. The chuck structure of a kind of tissue clip for endoscope according to claim 1, characterized in that: the side surfaces of the first clamping arm (1A) and the second clamping arm (1B) are separated by the distal end To the proximal end, it is gradually widened. 6. The chuck structure of a kind of endoscope tissue clip according to claim 1, is characterized in that: described first chute (1C) and second chute (1D) are all made of straight groove part and curved When the two clamping arms are merged, the straight grooves on the two clamping arms intersect to form an angle, and the elbow parts overlap.