Snare device with bendable head end

Abstract

The utility model relates to the technical field of medical instruments, in particular to a snare device with a bendable head end, which comprises a memory snare section arranged at the front end of a memory pipeline. The memory snare section comprises a first mounting cavity formed in the memory pipeline, and a plurality of connecting parts are arranged in the first mounting cavity; the connecting part close to the front end of the memory pipeline is connected with the inner wall of the front end of the first mounting cavity through a first spring, and the connecting part close to the rear end of the memory pipeline is connected with the inner wall of the rear end of the first mounting cavity through a second spring. The memory snare section at the front end of the memory pipeline is bent or straightened, so that the direction of extending out of the contraction coil is changed, the memory snare can adapt to polyps with poor view exposure, the polyps are smoothly cut off, the operation difficulty is greatly reduced, focuses can be better treated, and the operation efficiency is improved. Meanwhile, mucous membrane injury and even perforation risks caused by the rotating mirror are also reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a snare device with a flexible head end. Background Technology

[0002] In existing endoscopic treatments of gastrointestinal polyps or tumors, snares are commonly used endoscopic accessories. They are mainly used for the removal of gastrointestinal polyps, but also for the removal of raised or flat lesions, and even the removal of early-stage gastrointestinal cancers.

[0003] In existing snare devices, the metal snare can only protrude directly in front of the operating endoscope. However, the location of lesions in clinical practice is diverse and variable. When the endoscope is inserted deeper, the maneuverability of the endoscope is reduced. For some lesions in the posterior or high position of the digestive tract, it is difficult to achieve a good exposure field by operating the endoscope, thus affecting the smooth completion of the surgical procedure. Utility Model Content

[0004] The purpose of this invention is to provide a snare device with a flexible head end, which can change the direction of the protruding retractable coil by bending or straightening the snare segment at the front end of the memory tube.

[0005] The technical solution of this utility model:

[0006] A flexible snare device includes a memory snare section disposed at the front end of a memory tube; the memory snare section includes a first mounting cavity formed inside the memory tube, and a plurality of connecting parts are disposed in the first mounting cavity; the connecting parts near the front end of the memory tube are connected to the front inner wall of the first mounting cavity via a first spring, and the connecting parts near the rear end of the memory tube are connected to the rear inner wall of the first mounting cavity via a second spring; the plurality of connecting parts are connected in series via a guide wire; by tightening or loosening the guide wire, the front end of the memory tube can be straightened or bent.

[0007] Furthermore, the rear end of the connecting part has a protrusion, and the front end of the connecting part has a groove that mates with the protrusion; when the guide wire is tightened, the protrusion can be embedded in the groove.

[0008] Furthermore, the protrusion has a wire guide hole that communicates with the groove for the wire to pass through.

[0009] Furthermore, a mounting base is fixed to the rear end of the memory tube, and a second mounting cavity is provided on the mounting base. A control rod is provided in the second mounting cavity, and a base is rotatably connected to the lower end of the control rod. A third spring is sleeved on the control rod; one end of the third spring is fixed to the base, and the other end is fixed to the top inner wall of the second mounting cavity.

[0010] The front end of the guidewire is fixed to the protrusion of the connection part near the front end of the memory tube, and the rear end is fixed to the control rod. Rotating the control rod can tighten or loosen the guidewire.

[0011] Furthermore, the lower end of the control lever is connected to the base via a bearing.

[0012] Furthermore, the upper end of the control lever penetrates the mounting base and is fixed with a handle.

[0013] Furthermore, a placement groove is provided on the bottom inner wall of the second mounting cavity, and guide grooves are provided on both sides of the placement groove. A limit pin is connected to the guide groove via a fourth spring. The head of the limit pin is arc-shaped, and an insertion hole for inserting the limit pin is provided on the base.

[0014] Furthermore, the upper end of the control lever is connected to the mounting base via a linear bearing.

[0015] Furthermore, a shrink coil is provided inside the channel of the memory pipe.

[0016] Furthermore, the memory pipe has a push-pull device for driving the shrink coil at the rear end of the mounting base, and the push-pull device has an electrocoagulation interface.

[0017] The beneficial effects of this utility model are:

[0018] (1) The guide wire can be tightened or loosened by rotating the control lever, so that the front end of the memory tube is straightened or bent.

[0019] (2) After adjusting the state of the memory ring segment, press the control lever down so that the base is embedded in the placement slot. Since the head of the limit pin is arc-shaped, the limit pin moves to compress the fourth spring. When the insertion hole is aligned with the limit pin, the limit pin is inserted into the insertion hole due to the reset action of the fourth spring, thereby limiting the base and the control lever, preventing the limit lever from rotating, and thus fixing the state of the memory ring segment.

[0020] This invention changes the direction of the protruding shrink coil by bending or straightening the memory loop segment at the front end of the memory tube, making it adaptable to polyps with poor field of vision, thus facilitating the smooth removal of polyps. This greatly reduces the difficulty of operation, enables better treatment of lesions, and also reduces the risk of mucosal damage or even perforation caused by rotating the endoscope. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a first-view structural diagram of the first mounting cavity.

[0023] Figure 3 This is a schematic diagram of the second-view structure of the first mounting cavity.

[0024] Figure 4 This is a structural diagram of the connecting part.

[0025] Figure 5 This is a diagram of the internal structure of the mounting base.

[0026] Figure 6 This is a schematic diagram of the placement slot.

[0027] In the diagram: 1. Memory pipe, 2. Memory loop section, 21. First mounting cavity, 22. Connecting part, 23. First spring, 24. Second spring, 3. Guide wire, 221. Protrusion, 222. Mounting seat, 4. Second mounting cavity, 41. Control rod, 42. Base, 43. Third spring, 44. Bearing, 45. Handle, 46. Placement groove, 47. Guide groove, 48. Fourth spring, 49. Limiting pin, 410. Arc, 411. Linear bearing, 412. Shrink coil, 5. Push-pull device, 6. Electrocoagulation interface, 7. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] like Figures 1-6 As shown, this utility model provides a first embodiment of a snare device with a flexible head end, including a snare segment 2 disposed at the front end of a memory tube 1; the memory snare segment 2 includes a first mounting cavity 21 opened inside the memory tube 1, and a plurality of connecting parts 22 are disposed in the first mounting cavity 21; the connecting parts 22 near the front end of the memory tube 1 are connected to the inner wall of the front end of the first mounting cavity 21 via a first spring 23, and the connecting parts 22 near the rear end of the memory tube 1 are connected to the inner wall of the rear end of the first mounting cavity 21 via a second spring 24; the plurality of connecting parts 22 are connected in series via a guide wire 3; by tightening or loosening the guide wire 3, the front end of the memory tube 1 can be straightened or bent.

[0030] The rear end of the connecting part 22 has a protrusion 221, and the front end of the connecting part 22 has a groove 222 that cooperates with the protrusion 221. The connecting part 22 at the frontmost end does not have the groove 222. When the guide wire 3 is tightened, the protrusion 221 can be embedded in the groove 222.

[0031] The protrusion 221 has a wire guide hole (not shown) that communicates with the groove 222, for the guide wire 3 to pass through.

[0032] A mounting base 4 is fixed to the rear end of the memory tube 1. A second mounting cavity 41 is provided on the mounting base 4. A control rod 42 is provided in the second mounting cavity 41. The lower end of the control rod 42 is rotatably connected to a base 43. A third spring 44 is sleeved on the control rod 42. One end of the third spring 44 is fixed to the base 43, and the other end is fixed to the top inner wall of the second mounting cavity 41.

[0033] The front end of the guide wire 3 is fixed to the protrusion 221 of the connecting part 22 near the front end of the memory tube 1, and the rear end is fixed to the control rod 42. Rotating the control rod 42 can tighten or loosen the guide wire 3.

[0034] This embodiment has the following working principle: When it is necessary to straighten the memory ring segment 2, the rotating control rod 42 drives the guide wire 3 to tighten, thereby driving the protrusion 221 of the connecting part 22 to be embedded in the groove 222, so that the memory ring segment 2 is in a straight state; during this process, the first spring 23 is in a stretched state and the second spring 24 is in a compressed state.

[0035] When the memory ring segment 2 needs to be bent, the control lever 42 is rotated in the opposite direction to loosen the guide wire 3, thereby causing the protrusion 221 of the connecting part 22 to disengage from the groove 222, allowing the memory ring segment 2 to return to its bent state. Alternatively, without applying force to the control lever 42, since the first spring 23 is in a stretched state and the second spring 24 is in a compressed state, the first spring 23 and the second spring 24 have a forward elastic force due to the reset action, thereby causing the protrusion 221 of the connecting part 22 to disengage from the groove 222, allowing the guide wire 3 to loosen. As the guide wire 3 loosens, the control lever 42 automatically rotates in the opposite direction. Then, the control lever 42 can be manually rotated to adjust the tension of the guide wire 3, and the memory ring segment 2 can be gradually bent.

[0036] Based on the previous embodiment, the present invention provides a second embodiment in which the lower end of the control lever 42 is connected to the base 43 via a bearing 45, so that the base 43 does not rotate together when the control lever 42 rotates.

[0037] Based on any of the above embodiments, the present invention provides a third embodiment in which the upper end of the control lever 42 penetrates the mounting base 4 and is fixed with a handle 46, which allows the control lever 42 to be easily grasped and rotated manually.

[0038] Based on any of the above embodiments, this utility model provides a fourth embodiment. A placement groove 47 is formed on the bottom inner wall of the second mounting cavity 41. Guide grooves 48 are formed on both sides of the placement groove 47. A limiting pin 410 is connected to the guide groove 48 via a fourth spring 49. The head of the limiting pin 410 is arc-shaped 411. An insertion hole for inserting the limiting pin 410 is formed on the base 43. After adjusting the state of the memory ring segment 2, the control rod 42 is pressed down, causing the base 43 to embed into the placement groove 47. Because the head of the limiting pin 410 is arc-shaped 411, the limiting pin 410 moves and compresses the fourth spring 49. When the insertion hole aligns with the limiting pin 410, the reset action of the fourth spring 49 causes the limiting pin 410 to insert into the insertion hole, thereby limiting the base 43 and, consequently, limiting the control rod 42, preventing rotation of the control rod 42, and thus fixing the state of the memory ring segment 2.

[0039] Based on the previous embodiment, the present invention provides a fifth embodiment in which the upper end of the control rod 42 is connected to the mounting base 4 via a linear bearing 412, which facilitates the rotation and up-down movement of the control rod 42.

[0040] Based on any of the above embodiments, the present invention provides a sixth embodiment in which a shrink coil 5 is provided in the channel of the memory pipe 1 for covering the lesion.

[0041] Based on the previous embodiment, the present invention provides a seventh embodiment, wherein the memory pipe 1 has a pusher 6 for driving the shrink coil 5 at the rear end of the mounting base 4; the pusher 6 has an electrocoagulation interface 7, which can meet the operation of electrocoagulation and thermal cutting, and can be used for electrocution treatment by simply connecting a conventional electrocoagulation device.

[0042] The bearings, linear bearings, shrink coils, push-pull devices, and electrocoagulation interfaces in this utility model are all existing technologies, which are already clearly understood by those skilled in the art, and will not be described in detail here.

[0043] The above description is only a preferred embodiment of the present utility model and should not be construed as a limitation of this application. All equivalent changes and modifications made within the scope of the patent application of the present utility model should be included in the scope of the present utility model.

Claims

1. A snare device having a bendable head end, characterized in that, The memory snare section is provided at the front end of the memory conduit, and includes a first installation cavity opened in the memory conduit, and a plurality of connecting portions are arranged in the first installation cavity; the connecting portion near the front end of the memory conduit is connected with the inner wall of the front end of the first installation cavity through a first spring, and the connecting portion near the rear end of the memory conduit is connected with the inner wall of the rear end of the first installation cavity through a second spring; the plurality of connecting portions are connected in series through a guide wire; the front end of the memory conduit is straightened or bent by tightening or loosening the guide wire.

2. A flexible tip snare device according to claim 1, wherein, The rear end of the connecting portion has a convex portion, and the front end of the connecting portion has a groove matched with the convex portion; when the guide wire is tightened, the convex portion can be embedded in the groove.

3. A flexible tip snare device according to claim 2, wherein, A wire guide hole is opened in the convex portion and communicates with the groove, and the guide wire passes through the wire guide hole.

4. The flexible tip snare device of claim 1, wherein, The rear end of the memory conduit is fixed with a mounting seat, a second installation cavity is opened in the mounting seat, a control rod is arranged in the second installation cavity, the lower end of the control rod is rotatably connected with a base, and a third spring is sleeved on the control rod; one end of the third spring is fixed with the base, and the other end is fixed with the top inner wall of the second installation cavity. The front end of the guide wire is fixed with the convex portion of the connecting portion near the front end of the memory conduit, and the rear end is fixed with the control rod; the guide wire is tightened or loosened by rotating the control rod.

5. A flexible tip snare device according to claim 4, wherein, The lower end of the control rod is connected with the base through a bearing.

6. A flexible tip snare device according to claim 4 or 5, wherein, The upper end of the control rod penetrates the mounting seat and is fixed with a handle.

7. The flexible tip snare device of claim 4, wherein, A placing groove is opened in the bottom inner wall of the second installation cavity, guide grooves are opened in the two sides of the placing groove, a limiting pin is connected in the guide groove through a fourth spring, the head of the limiting pin is arc-shaped, and a plug hole is opened in the base for the limiting pin to be inserted.

8. A flexible tip snare device according to claim 7, wherein, The upper end of the control rod is connected with the mounting seat through a linear bearing.

9. The flexible tip snare device of claim 4, wherein, A shrinkage coil is arranged in the channel of the memory conduit.

10. The flexible tip snare device of claim 9, wherein, The rear end of the memory conduit has a push-pull device for driving the shrinkage coil, and the push-pull device has an electrocoagulation interface. The rear end of the memory conduit has a push-pull device for driving the shrinkage coil, and the push-pull device has an electrocoagulation interface.

Images