Convenient-to-use anti-perforation snare under endoscope

Abstract

The utility model provides an endoscopic anti-perforation snare convenient to use, which belongs to the technical field of snare and comprises a snare body, a sleeve and a ferrule, a first rack is arranged at the top of the sleeve, a driven gear meshed with the first rack is rotatably connected in the snare body through a rotating shaft, a driving gear is sleeved on the rotating shaft, and the driving gear is meshed with the first rack. A sliding block is connected to the snare body in a sliding mode, a sliding groove for the sliding block to slide is formed in the snare body, a second rack meshed with the driving gear is arranged on the sliding block, a plurality of clamping blocks are arranged on the side, away from the driven gear, of the first rack in the length direction of the first rack, and a limiting assembly for automatically limiting the clamping blocks is arranged in the snare body. By arranging the limiting assembly and the clamping block, movement of the catheter is achieved through cooperation of multiple sets of gears and racks, automatic limiting is achieved through the limiting assembly, control can be achieved with one hand, the length of the catheter can be conveniently adjusted and controlled, and the use feeling and the operation feeling of the snare body are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of snares, in particular to an anti-perforation snare under endoscope that is easy to use. Background Art

[0002] The endoscopic anti-perforation snare is a medical device used in endoscopic surgery of the digestive tract. It is mainly used to safely remove polyps or other raised lesions in the digestive tract, and to perform operations such as mucosal resection (EMR) or submucosal dissection (ESD) in the treatment of early cancer. During endoscopic surgery, the doctor will insert the snare into the patient's body through the working channel of the endoscope, use its loop part to surround the lesion tissue, and then tighten the loop to remove or remove the target tissue. However, the existing snare has a fixed length of the sleeve, and the insertion depth is difficult to control when targeting different treatment sites, making it inconvenient to use.

[0003] In order to address the above problems, the existing Chinese patent with announcement number CN219374839U proposes a disposable endoscopic anti-perforation snare, which drives the screw to rotate through a driving member, so that the screw drives the connecting ring to move along the screw, and the connecting ring drives the sleeve to move and retract in the hand-held tube, thereby adjusting the length of the sleeve. When targeting different treatment sites, it is convenient to control the insertion depth, and the use is more convenient and reliable.

[0004] However, although the above-mentioned disposable endoscopic anti-perforation snare can drive the screw to rotate through the driving member, so that the connecting ring drives the sleeve to move, the disposable endoscopic anti-perforation snare needs to drive the worm wheel to rotate by rotating the worm to make the screw rotate. Since the hand-held tube is usually grasped with one hand when in use, this brings certain inconveniences when adjusting the worm, thereby causing the problem of inconvenience in adjusting the catheter. Therefore, the utility model provides an easy-to-use endoscopic anti-perforation snare to meet the demand. Utility Model Content

[0005] The utility model aims to solve the problems existing in the above-mentioned background technology and provides an easy-to-use endoscopic anti-perforation snare.

[0006] The technical problem to be solved by the utility model is to provide an easy-to-use endoscopic anti-perforation snare to solve the problem that the existing snare needs to rotate the worm to drive the worm wheel to rotate so that the screw can be rotated. Since the hand-held tube is usually grasped with one hand when in use, this brings certain inconveniences when adjusting the worm, thereby causing the problem of inconvenience in adjusting the catheter.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0008] An easy-to-use endoscopic anti-perforation snare comprises: a snare body, a sleeve movably arranged inside the snare body, and a ferrule movably arranged in a catheter, wherein a first rack is arranged on the top of the sleeve, a driven gear meshing with the first rack is rotatably connected to the snare body through a rotating shaft, a driving gear is sleeved on the rotating shaft, a slider is slidably connected to the snare body, a sliding groove is arranged on the snare body for the slider to slide, a second rack meshing with the driving gear is arranged on the slider, a side of the first rack facing away from the driven gear is provided with a plurality of blocks along its length direction, and a limiting component for automatically limiting the block is arranged in the snare body.

[0009] Preferably, the limiting component comprises:

[0010] A movable plate is movably arranged in the snare body, a movable groove for the movable plate to move is provided in the snare body, and a limiting block for limiting the positions of the plurality of clamping blocks is fixedly connected to the movable plate;

[0011] A movable rod is fixedly connected to one end of the movable plate away from the limit block, the movable rod is movably connected to the snare body, a spring 1 is sleeved on the movable rod, the spring 1 is located in the movable groove and fixedly connected to the movable plate.

[0012] Preferably, the limiting block and the clamping block have end faces that are wedged into each other and end faces that are clamped to each other.

[0013] Preferably, a driving assembly for driving the movable rod to move is provided in the snare body, and the driving assembly comprises:

[0014] A wedge block 1 and a wedge block 2 are mutually wedged and movably arranged in the snare body. A connecting rod is fixedly connected to the wedge block 1, and an end of the connecting rod facing away from the wedge block 1 is fixedly connected to the movable rod;

[0015] A push rod is fixedly connected to the second wedge block, and one end of the push rod facing away from the second wedge block extends to the outside of the snare body.

[0016] Preferably, the snare body is provided with a first moving groove and a second moving groove for allowing the first wedge block and the second wedge block to move, respectively.

[0017] Preferably, a reset plate is fixedly connected to the push rod, a reset groove for the reset plate to move is provided in the snare body, a second spring is fixedly connected to the bottom of the reset plate, and the second spring is sleeved on the push rod.

[0018] Preferably, a push plate is fixedly connected to the top of the push rod, and a corrugated sleeve sleeved on the push plate and the push rod is fixedly connected to the snare body.

[0019] Preferably, a spring three is fixedly connected between the top of the first rack and the snare body.

[0020] Compared with the prior art, the utility model has at least the following beneficial effects:

[0021] In the above scheme, by setting a limit assembly and a card block, the movement of the catheter is achieved through the cooperation of multiple sets of gears and racks, and automatic limiting is achieved through the limit assembly. It can be operated with one hand, which is convenient for adjusting the length of the catheter and improving the use and operation feel of the snare body.

[0022] In the above scheme, by providing a drive assembly and a bellows, the drive assembly facilitates the collection of the catheter into the snare body, making it easier for medical staff to use it, and the bellows can protect the push plate and the push rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable those skilled in the relevant art to make and use the present disclosure.

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 It is a cross-sectional view of the utility model;

[0026] Figure 3 For this utility model Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0027] Figure 4 For this utility model Figure 2 Schematic diagram of the enlarged structure at point B in the middle.

[0028] [reference numerals]

[0029] 1. snare body; 2. slider; 3. slide groove; 4. corrugated sleeve; 5. ferrule; 6. sleeve; 7. drive assembly; 71. wedge block 1; 72. connecting rod; 73. wedge block 2; 74. push rod; 8. clamping block; 9. limit assembly; 91. limit block; 92. movable plate; 93. spring 1; 94. movable rod; 95. movable groove; 10. movable groove 2; 11. movable groove 1; 12. first rack; 13. second rack; 14. driven gear; 15. driving gear; 16. rotating shaft; 17. reset plate; 18. spring 2; 19. reset groove; 20. spring 3; 21. push plate. DETAILED DESCRIPTION

[0030] like Figures 1 to 4As shown, an embodiment of the utility model provides an easy-to-use endoscopic anti-perforation snare, comprising a snare body 1, a sleeve 6 movably arranged inside the snare body 1, and a ferrule 5 movably arranged in a catheter, a first rack 12 is provided on the top of the sleeve 6, a driven gear 14 meshing with the first rack 12 is rotatably connected in the snare body 1 through a rotating shaft 16, a driving gear is sleeved on the rotating shaft 16, a slider 2 is slidably connected to the snare body 1, a sliding groove 3 for sliding the slider 2 is provided on the snare body 1, a second rack 13 meshing with the driving gear is provided on the slider 2, a side of the first rack 12 away from the driven gear 14 is provided with a plurality of blocks 8 along its length direction, and a limiting component 9 for automatically limiting the block 8 is provided in the snare body 1.

[0031] Specifically, when the length of the catheter needs to be adjusted, the slider 2 is pushed to slide upward along the slide groove 3 by the fingers of the hand grasping the snare body 1, so that the second rack 13 drives the active gear to rotate, and the active gear drives the driven gear 14 to rotate, so that the driven gear 14 drives the first rack 12 to move downward, so that the first rack 12 pushes the catheter to extend out of the snare body 1. After the length is adjusted, the block 8 is limited by the limit assembly 9, that is, the catheter is limited. The overall structure is simple to operate and can be controlled with one hand, which is convenient for adjusting the length of the catheter, improves the use and operation of the snare body 1, and solves the problem that the existing snare needs to rotate the worm to drive the worm wheel to rotate in order to rotate the screw. Since the hand-held tube is usually grasped with one hand when in use, this brings certain inconveniences when adjusting the worm, thereby causing the problem of inconvenience in adjusting the catheter.

[0032] It should be noted that the diameter of the driving gear is smaller than that of the driven gear 14, so as to reduce the moving distance of the second rack 13 and increase the moving distance of the first rack 12, so as to speed up the adjustment speed of the catheter length.

[0033] like Figure 2 and Figure 3As shown, in this embodiment, the limiting assembly 9 includes a movable plate 92, which is movably arranged in the snare body 1, and a movable groove 95 is provided in the snare body 1 for the movable plate 92 to move. A limiting block 91 for limiting a plurality of blocks 8 is fixedly connected to the movable plate 92, and a movable rod 94 is fixedly connected to one end of the movable plate 92 away from the limiting block 91. The movable rod 94 is movably connected to the snare body 1, and a spring 93 is sleeved on the movable rod 94. The spring 93 is located in the movable groove 95 and is fixedly connected to the movable plate 92. There are mutually wedging end faces and mutually clamping end faces between the positioning block 91 and the clamping block 8. Specifically, when the first rack 12 moves downward, the first rack 12 pushes the positioning block 91 to move into the movable groove 95, and drives the movable plate 92 to squeeze the spring 1 93. At this time, the mutually wedging end faces of the positioning block 91 and the clamping block 8 contact each other. At the same time, when the movement of the first rack 12 is stopped, the mutually clamping end faces of the positioning block 91 and the clamping block 8 are fitted together under the action of the spring 1 93, thereby realizing the limiting of the clamping block 8 (for details, please refer to Figure 3 ), that is, the position limitation of the catheter is achieved.

[0034] like Figures 2 to 4 As shown, in this embodiment, a driving assembly 7 for driving the movable rod 94 is provided in the snare body 1, and the driving assembly 7 includes a wedge block 1 71 and a wedge block 2 73 which are wedged with each other, and are movably arranged in the snare body 1. A connecting rod 72 is fixedly connected to the wedge block 1 71, and one end of the connecting rod 72 away from the wedge block 1 71 is fixedly connected to the movable rod 94, and a push rod 74 is fixedly connected to the wedge block 2 73, and one end of the push rod 74 away from the wedge block 2 73 extends to the outside of the snare body 1, and a moving groove 11 and a moving groove 2 10 for the movement of the wedge block 1 71 and the wedge block 2 73 are respectively provided in the snare body 1, a reset plate 17 is fixedly connected to the push rod 74, and a reset groove 19 for the movement of the reset plate 17 is provided in the snare body 1, and a spring 2 18 is fixedly connected to the bottom of the reset plate 17, and the spring 2 18 is sleeved on the push rod 74. The top of the push rod 74 is fixedly connected to a push plate 21, and the snare body 1 is fixedly connected to a corrugated sleeve 4 which is sleeved on the push plate 21 and the push rod 74. Specifically, when it is necessary to shorten the length of the catheter or to put the catheter into the snare body 1, the push plate 21 is pressed by a finger, and the push plate 21 drives the wedge block 2 73 through the push rod 74 to push the wedge block 1 71 to move, so that the wedge block 1 71 drives the movable rod 94 through the connecting rod 72, and the movable rod 94 drives the movable plate 92 to move, so that the upper limit block 91 releases the limit on the card block 8. Similarly, when the push plate 21 is released, the wedge block 2 73 is reset under the elastic force of the spring 2 18, and the limit block 91 can re-position the card block 8 at this time, thereby facilitating the contraction of the catheter and facilitating the use of medical staff. Further, the corrugated sleeve 4 can protect the push plate 21 and the push rod 74.

[0035] like Figure 2and Figure 4 As shown, in this embodiment, a spring three 20 is fixedly connected between the top of the first rack 12 and the snare body 1. Specifically, the spring three 20 can accelerate the resetting of the first spring and the catheter.

[0036] Working principle:

[0037] When the length of the catheter needs to be adjusted, the slider 2 is pushed upward along the slide groove 3 by the fingers of the hand grasping the snare body 1, so that the second rack 13 drives the active gear to rotate, and the active gear drives the driven gear 14 to rotate, so that the driven gear 14 drives the first rack 12 to move downward, so that the first rack 12 pushes the catheter to extend out of the snare body 1. After the length is adjusted, the block 8 is limited by the limit assembly 9, that is, the catheter is limited. The overall structure is simple to operate and can be controlled by one hand, which is convenient for adjusting the length of the catheter, improves the use and operation of the snare body 1, and solves the problem that the existing snare needs to rotate the worm to drive the worm wheel to rotate in order to rotate the screw. Since the hand-held tube is usually grasped by one hand when in use, this brings certain inconveniences when adjusting the worm, thereby causing the problem of inconvenience in adjusting the catheter.

Claims

1. An easy-to-use endoscopic anti-perforation snare, comprising a snare body (1), a sleeve (6) movably arranged inside the snare body (1), and a ferrule (5) movably arranged inside a catheter, characterized in that: A first rack (12) is provided at the top of the sleeve (6); a driven gear (14) meshing with the first rack (12) is rotatably connected in the snare body (1) via a rotating shaft (16); a driving gear is sleeved on the rotating shaft (16); a slider (2) is slidably connected to the snare body (1); a slide groove (3) for the slider (2) to slide is provided on the snare body (1); and a second rack (13) meshing with the driving gear is provided on the slider (2); A plurality of clamping blocks (8) are provided along the length direction of the first rack (12) on the side away from the driven gear (14), and a limiting assembly (9) for automatically limiting the clamping blocks (8) is provided in the snare body (1).

2. The easy-to-use endoscopic anti-perforation snare according to claim 1, characterized in that: The limiting component (9) comprises: A movable plate (92) is movably arranged in the snare body (1), and a movable groove (95) is provided in the snare body (1) for the movable plate (92) to move, and a limiting block (91) for limiting the position of the plurality of the clamping blocks (8) is fixedly connected to the movable plate (92); A movable rod (94) is fixedly connected to one end of the movable plate (92) away from the limit block (91), the movable rod (94) is movably connected to the snare body (1), and a spring (93) is sleeved on the movable rod (94), and the spring (93) is located in the movable groove (95) and fixedly connected to the movable plate (92).

3. The easy-to-use endoscopic anti-perforation snare according to claim 2, characterized in that: The limiting block (91) and the clamping block (8) have end faces that are wedged together and end faces that are clamped together.

4. The easy-to-use endoscopic anti-perforation snare according to claim 2, characterized in that: The snare body (1) is provided with a driving assembly (7) for driving the movable rod (94) to move. The driving assembly (7) comprises: A wedge block 1 (71) and a wedge block 2 (73) are mutually wedged and movably arranged in the snare body (1); a connecting rod (72) is fixedly connected to the wedge block 1 (71); and an end of the connecting rod (72) away from the wedge block 1 (71) is fixedly connected to the movable rod (94); A push rod (74) is fixedly connected to the second wedge block (73), and one end of the push rod (74) facing away from the second wedge block (73) extends to the outside of the snare body (1).

5. The easy-to-use endoscopic anti-perforation snare according to claim 4, characterized in that: The snare body (1) is provided with a first moving groove (11) and a second moving groove (10) for the wedge block (71) and the wedge block (73) to move, respectively.

6. The easy-to-use endoscopic anti-perforation snare according to claim 4, characterized in that: A reset plate (17) is fixedly connected to the push rod (74), a reset groove (19) for the reset plate (17) to move is provided in the snare body (1), a second spring (18) is fixedly connected to the bottom of the reset plate (17), and the second spring (18) is sleeved on the push rod (74).

7. The easy-to-use endoscopic anti-perforation snare according to claim 6, characterized in that: The top of the push rod (74) is fixedly connected to a push plate (21), and the snare body (1) is fixedly connected to a corrugated sleeve (4) sleeved on the push plate (21) and the push rod (74).

8. The easy-to-use endoscopic anti-perforation snare according to claim 1, characterized in that: A spring three (20) is fixedly connected between the top of the first rack (12) and the snare body (1).

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