Tensioning detachable snare

Abstract

The invention relates to the technical field of snare, in particular to a detachable tensioning snare which comprises an outer pipe, a ferrule, an inhaul cable and a butt joint pipe set, one end of the ferrule is a ferrule part, the other end of the ferrule is a connecting part, the area defined by the inner circumferential wall of the ferrule part is a sleeving hole, and the butt joint pipe set is provided with a front pipe and a rear pipe which are detachably and fixedly connected. After a diseased tissue is sleeved with the sleeving hole in the sleeve part, the inhaul cable is pulled backwards to enable the sleeve part to enter the tightening ring, the area of the sleeving hole is reduced to loop and tie the diseased tissue, the tightening ring tightly holds the sleeve ring through the elasticity of the tightening ring, and the outer tube, the inhaul cable, the rear tube and the like can be withdrawn from the forceps channel hole, so that the forceps channel hole can be vacated under the condition that the diseased tissue is sleeved with the sleeve ring; other instruments can conveniently enter for operation; meanwhile, due to the detachable design of the butt joint pipe set, the snare can be provided with ferrules of various types and specifications, interchangeability is good, and an operator can select a proper loop head to conduct an operation according to the hardness and thickness of a lesion.

Description

[0001] This application is a divisional application of patent application number: 202310439156.9 Technical Field

[0002] The invention relates to the technical field of snares, in particular to a tensioned and detachable snare. Background Art

[0003] The snare is mainly composed of a loop, a cable and a handle assembly. When used, it cooperates with the endoscope. The handle assembly controls the loop through the cable to remove polyps or other excess tissues in the digestive tract.

[0004] During the actual operation, the snare is inserted into the patient's digestive tract through the forceps hole of the endoscope, and then the surgeon adjusts the position of the snare through the handle assembly to trap the polyp and remove the polyp. However, during the actual operation, it is difficult for the current snare to successfully remove some large and hard polyps. During the operation, the forceps hole of the endoscope will be occupied by the snare, and the surgeon cannot insert other instruments (such as biopsy forceps, injection needles and mucosal cutters, etc.) through the forceps hole to cooperate with the snare when the polyp is entangled by the snare. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in order to solve the problem in the prior art that other instruments cannot be inserted through the forceps channel hole of the endoscope to cooperate with the snare when the polyp is ligated by the snare, a tensioned and detachable snare is provided.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a tensioned and detachable snare, comprising:

[0007] External pipe;

[0008] The ferrule is provided with a tightening ring elastically hugging the outside of the ferrule, the front end of the tightening ring is arranged opposite to the distal end of the outer tube, one end of the ferrule is a snare part located outside the front end of the tightening ring, and the other end is a connecting part located at the rear end of the tightening ring, and the area surrounded by the inner peripheral wall of the snare part is a snare hole;

[0009] A cable is arranged inside the outer tube so as to be movable forward and backward;

[0010] And a butt-jointed tube assembly, comprising a front tube and a rear tube which are detachably fixedly connected to each other, the front tube and the connecting part are fixedly connected, and the front end of the cable and the rear tube are fixedly connected; when the cable moves backward, the butt-jointed tube assembly pulls the ferrule to make the snare part gradually enter the tightening ring, so that the area of ​​the snare hole of the snare part gradually decreases; when the cable moves forward, the butt-jointed tube assembly pushes the ferrule to make the snare part gradually withdraw from the tightening ring, so that the area of ​​the snare hole of the snare part gradually increases.

[0011] Furthermore, the tightening ring is elastic and is arranged so that the ferrule can stay at any position on the moving path of entering or exiting the tightening ring.

[0012] Furthermore, one of the front tube and the rear tube is provided with an external thread section, and the other is provided with an internal thread section matching the external thread section, and the external thread section and the internal thread section are threadedly connected.

[0013] Furthermore, the external thread segment is an external thread segment with a double-thread, and the internal thread segment is an internal thread segment with a double-thread.

[0014] Furthermore, the front tube and the rear tube are clamped.

[0015] Furthermore, one of the front tube and the rear tube is provided with a plug, and the other is provided with a socket, and the plug is snap-fitted into the socket;

[0016] The plug includes a thick section connected to each other and a thin section with a smaller cross-sectional area than the thick section. The jack includes a large hole connected to each other and a small hole with a smaller cross-sectional area than the large hole. The butt-joint tube assembly is located at the position where the small hole is located and can be elastically deformed to allow the thick section to pass through the small hole to enter or leave the large hole. When the plug is clamped in the jack, the thick section is located in the large hole and the thin section is located in the small hole.

[0017] Furthermore, the ferrule is formed by bending a core wire of a metal material, a wire is provided on the core wire, and the wire is spirally wound around the core wire along the length direction of the core wire to form a spiral groove.

[0018] Furthermore, the inner circumferential wall of the tightening ring is provided with anti-slip teeth for embedding in the spiral groove.

[0019] Furthermore, the wire is stainless steel wire.

[0020] Furthermore, the tightening ring is made of TPU polyurethane.

[0021] The beneficial effect of the present invention is that after the tightened and detachable snare of the present invention has caught the diseased tissue in the trap hole in the trap part, the cable is pulled backward to make the snare part enter the tightening ring, the trap hole area is reduced to trap the diseased tissue, and the tightening ring uses its own elasticity to hold the snare tightly, so when the rear tube is removed from the front tube, the snare still binds the diseased tissue tightly, and at the same time, the outer tube, the cable and the rear tube can be withdrawn from the clamp hole, and only the snare part, the front tube and the tightening ring of the snare are retained. At this time, the tightening ring is constrained on the diseased tissue, so that the clamp hole can be vacated when the snare is caught on the diseased tissue, so as to facilitate the entry of other instruments for surgery. That is, the snare of the present invention can realize the two functions of ligating and removing the diseased tissue. Under normal circumstances, the diseased tissue The tissue is removed by the loop; once it is found that the ligated component cannot be successfully removed by the loop, there is no need to withdraw the snare as a whole. The snare can be retained in the patient's body to continue to maintain the ligation function on the lesion tissue, so that the lesion tissue protrudes, and the outer tube, pull rope and rear tube of the snare are withdrawn to leave a vacant clamp hole for other instruments to enter the patient's body. The tissue trapped by the snare will stand out, which is convenient for the surgeon to quickly and accurately locate the lesion tissue, and provide convenience for other instruments to remove the lesion tissue, thereby improving the efficiency of the operation; at the same time, due to the detachable design of the butt tube group, the snare can be equipped with loops of various models and specifications, with good interchangeability. The surgeon can select the appropriate loop head according to the hardness and thickness of the lesion to perform the operation.

[0022] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 is a schematic diagram of a tensioned and detachable snare of the present invention;

[0025] Figure 2 yes Figure 1 A is a partial enlarged schematic diagram;

[0026] Figure 3 It is a schematic diagram that the area of ​​the trap hole of the trap portion gradually increases;

[0027] Figure 4 It is a schematic diagram when the internal thread section and the external thread section are disengaged;

[0028] Figure 5 This is a schematic diagram of the plug and the jack when they are connected;

[0029] Figure 6 It is a schematic diagram of the plug and the socket being disengaged;

[0030] Figure 7 It is a schematic diagram of the cooperation between the tightening ring and the ferrule;

[0031] Figure 8 yes Figure 7 A partial enlarged schematic diagram of B in the figure.

[0032] In the figure: 1. outer tube;

[0033] 2. ferrule, 21. ferrule portion, 211. ferrule hole, 22. connecting portion, 2a. core wire, 2b. wire material, 2c. spiral groove;

[0034] 3. Tightening ring, 31. Anti-slip teeth;

[0035] 4. Cable;

[0036] 5, butt-jointed tube assembly, 51, front tube, 511, internal thread section, 512, jack, 512a, large hole, 512b, small hole, 52, rear tube, 521, external thread section, 522, plug, 522a, thick section, 522b, thin section;

[0037] 6. Handle assembly, 61. Core rod, 62. Slip ring. DETAILED DESCRIPTION

[0038] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention, and directions and references (e.g., up, down, left, right, etc.) may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0039] like Figure 1-8 As shown, a tensioned and detachable snare comprises an outer tube 1, a ferrule 2, a cable 4 and a butt-joint tube assembly 5;

[0040] The rear end of the outer tube 1 can be connected to the handle assembly 6. The handle assembly 6 can be any handle assembly 6 on a snare or electric snare in the prior art, which is not limited in this embodiment. For example, the handle assembly 6 may include a core rod 61 and a slip ring 62. The rear end of the outer tube 1 is fixedly connected to the front end of the core rod 61. The slip ring 62 is slidably mounted on the core rod 61. The rear end of the cable 4 is fixedly connected to the slip ring 62.

[0041] The ferrule 2 is provided with a tightening ring 3 elastically hugging the outside of the ferrule 2, the front end of the tightening ring 3 is arranged opposite to the distal end of the outer tube 1, one end of the ferrule 2 is a snare portion 21 located outside the front end of the tightening ring 3, and the other end is a connecting portion 22 located at the rear end of the tightening ring 3, and the area surrounded by the inner circumferential wall of the snare portion 21 is a snare hole 211 for snare polyps or other diseased tissues;

[0042] The cable 4 can be arranged in the outer tube 1 so as to move forward and backward; the cable 4 can be, but is not limited to, a steel wire rope or a synchronously rotating steel wire rope. The synchronously rotating steel wire rope can transmit loads over long distances, has high tensile strength, fatigue resistance and impact toughness, good corrosion resistance, good softness, and good synchronous rotation performance, can transmit rotational force over long distances, accurately control the forward and backward movement of the ferrule 2, and drive the ferrule 2 to rotate, without problems such as operation delays;

[0043] The butt-joint tube assembly 5 comprises a front tube 51 and a rear tube 52, the front tube 51 and the connection portion 22 of the ferrule 2 are fixedly connected, the front end of the cable 4 and the rear tube 52 are fixedly connected, and the front tube 51 and the rear tube 52 are detachably fixedly connected; Figure 1 As shown, when the cable 4 moves backward, the connecting pipe assembly 5 pulls the ring 2 so that the ring portion 21 gradually enters the tightening ring 3, so that the area of ​​the ring hole 211 of the ring portion 21 gradually decreases; Figure 3 As shown, when the cable 4 moves forward, the connecting tube assembly 5 pushes the ferrule 2 to make the snare portion 21 gradually withdraw from the tightening ring 3, so that the area of ​​the snare hole 211 of the snare portion 21 gradually increases.

[0044] After the detachable snare has captured the diseased tissue in the trap hole 211 in the trap portion 21, the pull rope 4 is pulled backwards to make the trap portion 21 enter the tightening ring 3, and the area of ​​the trap hole 211 is reduced to trap the diseased tissue. Figure 4 As shown, the tightening ring 3 uses its own elasticity to hold the loop 2 tightly, so when the rear tube 52 is removed from the front tube 51, the loop 2 still binds the diseased tissue. At the same time, the outer tube 1, the pull rope 4 and the rear tube 52 can be withdrawn from the clamp hole, leaving only the snare portion 21 of the loop 2, the front tube 51 and the tightening ring 3. At this time, the tightening ring 3 is constrained on the diseased tissue, so that the clamp hole can be vacated when the loop 2 is wrapped around the diseased tissue, so as to facilitate the entry of other instruments for surgery; at the same time, due to the detachable design of the butt tube group 5, the snare can be equipped with loops 2 of various models and specifications, with good interchangeability. The operator can select a suitable loop head according to the hardness and thickness of the lesion to perform the surgery.

[0045] In some examples, the tightening ring 3 is elastic and is configured so that the ring 2 can stay at any position on the moving path of entering or exiting the tightening ring 3; so as to prevent the ring 2 from slipping off the diseased tissue due to the forward displacement of the ring 2 relative to the tightening ring 3 after the front tube 51 and the rear tube 52 are separated;

[0046] The material of the tightening ring 3 may be but is not limited to TPU polyurethane, which has good hardness, elasticity, tear strength and tensile strength. Preferably, the material of the tightening ring 3 is medical grade TPU polyurethane, and the outer peripheral surface of the tightening ring 3 is smooth, such as a cylindrical surface; the end face of the tightening ring 3 is flat, such as a plane, and the inner hole surrounded by the inner peripheral surface of the tightening ring 3 is coaxially arranged with the outer peripheral surface of the tightening ring 3 without eccentricity.

[0047] Regarding the detachable fixed connection between the front tube 51 and the rear tube 52, the following detachable forms may be adopted but are not limited to:

[0048] The first detachable form: Figure 2 and 4 As shown, one of the front tube 51 and the rear tube 52 is provided with an external thread section 521, and the other is provided with an internal thread section 511 matching the external thread section 521, that is, when the front tube 51 is provided with the external thread section 521, the rear tube 52 is provided with the internal thread section 511; when the front tube 51 is provided with the internal thread section 511, the rear tube 52 is provided with the external thread section 521; the external thread section 521 and the internal thread section 511 are threadedly connected; when the rear tube 52 is driven by the cable 4 to rotate in one direction, the rear tube 52 is tightened on the front tube 51; when the rear tube 52 is driven by the cable 4 to rotate in another direction, the rear tube 52 gradually moves away from the front tube 51 until they are separated, and the cable 4 adopts a synchronously rotating steel wire rope to accurately control the loading and unloading of the front tube 51 and the rear tube 52 to avoid problems such as operation delay;

[0049] The external thread section 521 can also be an external thread section 521 with a double-thread, and correspondingly, the internal thread section 511 is an internal thread section 511 with a double-thread; the external thread section 521 and the internal thread section 511 adopt double-thread, and the double-thread lead is twice the single-thread lead, which can realize fast loading and unloading between the front tube 51 and the rear tube 52, and the rear tube 52 is also smoother when removed from the front tube 51.

[0050] The second detachable form: Figure 5 and 6 As shown, one of the front tube 51 and the rear tube 52 is provided with a plug 522, and the other is provided with a socket 512, and the plug 522 is clamped in the socket 512; that is, when the plug 522 is provided on the front tube 51, the socket 512 is provided on the rear tube 52; when the socket 512 is provided on the front tube 51, the plug 522 is provided on the rear tube 52;

[0051] Taking the case where the front tube 51 is provided with a socket 512 and the rear tube 52 is provided with a plug 522 as an example, the plug 522 includes a thick section 522a connected to each other and a thin section 522b with a cross-sectional area smaller than the thick section 522a, the socket 512 includes a large hole 512a connected to each other and a small hole 512b with a cross-sectional area smaller than the large hole 512a, and a step surface is formed between the large hole 512a and the small hole 512b, and an end surface of the thick section 522a close to the step surface contacts, abuts or leaves a gap with the step surface, and the butt joint tube assembly 5 is located at the position where the small hole 512b is located, and can be elastically deformed to allow the thick section 522a to pass through the small hole 512b to enter or leave the large hole 512a, and the rear end of the front tube 51 can also be provided with a plurality of notches spaced along its circumferential direction, and the notches extend from the outer wall of the front tube 51 to the inner wall of the small hole 512b, and can be easily elastically deformed to facilitate the thick section 522a to enter and exit the small hole 512b;

[0052] When the cable 4 drives the rear tube 52 to move forward, the plug 522 on the thick section 522a first forces the front tube 51 to produce elastic deformation at the small hole 512b, until the thick section 522a is completely in the large hole 512a, and the thin section 522b is correspondingly located in the small hole 512b, thereby achieving the clamping connection between the rear tube 52 and the front tube 51; when the cable 4 drives the rear tube 52 to move backward, the plug 522 on the thick section 522a moves into the small hole 512b, causing the front tube 51 to produce elastic deformation at the small hole 512b, until it completely leaves the small hole 512b, thereby achieving the separation of the rear tube 52 from the front tube 51.

[0053] The third detachable form: the front tube 51 and the rear tube 52 are rotatably connected, the rear tube 52 is provided with a clamping column, and the rear end of the front tube 51 is provided with a rotatable clamping groove, which is configured to have an inlet section parallel to the axis of the front tube 51 and a circumferential section perpendicular to the axis of the front tube 51, and the inlet section and the circumferential section are connected;

[0054] When engaging, first align the engaging column with the entrance section, then move the rear tube 52 forward until the engaging column reaches the circumferential section along the entrance section, then rotate the rear tube 52 to drive the engaging column into the circumferential section, so that the engaging column will be offset from the entrance section, thereby realizing the rotational engaging of the front tube 51 and the rear tube 52; when disassembling, first rotate the rear tube 52 so that the engaging column rotates along the circumferential section until it is aligned with the entrance section, then move the rear tube 52 backward, and the rear tube 52 can be separated from the front tube 51.

[0055] In some examples, such as Figure 7 and 8As shown, the loop 2 is formed by bending a core wire 2a of a metal material, and a wire 2b is provided on the core wire 2a; the material of the core wire 2a can also be a shape memory alloy, so that the front end of the loop 2 can be automatically unfolded after leaving the tightening ring 3; the material of the core wire 2a can specifically be nickel-titanium alloy, for example, multiple strands of nickel-titanium wires are woven or twisted to form the core wire 2a; the wire 2b is spirally wound around the core wire 2a along the length direction of the core wire 2a to form a spiral groove 2c; so that the loop 2 has an anti-slip feature. In some existing technologies, some existing snares are prone to slipping when some sessile, flat and poorly positioned polyps are being removed, thereby affecting the normal progress of the operation and causing inconvenience to medical staff, and some snares are not easy to quickly adjust their own state. After a part of the polyp is removed, some snares cannot be quickly restored, thereby affecting the efficiency of the operation. Therefore, the loop 2 with the spirally wound wire 2b can perfectly solve the above technical problems, because the spirally wound wire 2b can not only make the loop 2 anti-slip when removing polyps, which is beneficial for the removal hole 211 in the snare part 21 to successfully remove some sessile, flat and poorly positioned polyps, but also increase the friction between the loop 2 and the tightening ring 3, reduce or avoid the phenomenon of the loop 2 slipping off the diseased tissue, and also improve the restoring force of the loop 2, so that the snare part 21 can quickly recover when leaving the tightening ring 3.

[0056] In some examples, the inner wall of the tightening ring 3 is provided with anti-slip teeth 31 for embedding in the spiral groove 2c. The material of the anti-slip teeth 31 is consistent with that of the tightening ring 3, which can greatly increase the tightening effect of the tightening ring 3 on the snare portion 21 for tying human tissue, and avoid the snare portion 21 from loosening after tying human tissue. The anti-slip teeth 31 can also be a barb structure that gradually tilts from front to back toward the axis of the tightening ring 3, so as to further hinder the snare portion 21 from leaving the tightening ring 3 forward, and avoid the snare portion 21 from loosening due to forward movement after tying human tissue; specifically, one end of the anti-slip teeth 31 is a fixed end fixedly connected to or integrally formed with the inner wall of the winding ring 3, and the other end is a free end. The angle between the line between the center point of the free end and the center point of the fixed end and the axis of the winding ring 2 is an acute angle, and the range of the acute angle is preferably 10°-45°.

[0057] In some examples, the wire 2b is a stainless steel wire, which has relatively good elasticity. On the one hand, it can improve the strength of the loop 2, and on the other hand, it can improve the restoring force of the loop 2 and increase the recovery speed of the loop portion 21 when leaving the tightening ring 3.

[0058] The above-mentioned tensioning and detachable snare is operated as follows:

[0059] 1) If Figure 1 and 2As shown, before inserting the endoscope, a test is performed first. During the test, the tightening ring 3 is not assembled on the ferrule 2. The handle assembly 6 drives the cable 4 to move forward and backward, so that the ferrule 2 is pulled into or pushed out of the outer tube 1. When the ferrule 2 is pulled into the outer tube 1, a closing action is generated, and when the ferrule 2 is pushed out of the outer tube 1, an expansion action is generated, and it is confirmed that there is no adverse condition;

[0060] 2) If Figure 2 As shown, after the test is completed, the tightening ring 3 is inserted from the front end of the ferrule 2, and the tightening ring 3 is set on the ferrule 2. At this time, most of the ferrule 2 is at the front end of the tightening ring 3 and is in an expanded state. Then, the snare part 21 is pinched by hand and enters the clamp hole of the endoscope. After passing through the clamp hole, the snare part 21 is expanded. In particular, the ferrule made of shape memory alloy has a memory property, and the snare part 21 will naturally expand in a preset state;

[0061] 3) The handle assembly 6 is moved to drive the snare portion 21 to move to the lesion tissue, the snare portion 21 is wrapped around the lesion tissue, the slip ring 62 is operated to tighten the ferrule 2 at a certain speed, the cable 4 pulls the ferrule 2 to move backwards, and during the backward movement of the ferrule 2, the tightening ring 3 is pressed against the outer tube 1 and remains motionless, so that the snare portion 21 of the ferrule 2 gradually enters the tightening ring 3;

[0062] 4) When the snare part 21 is tightened, the tightening ring 3 holds the ferrule 2 tightly to prevent the snare part 21 from being loosened after being wrapped around the diseased tissue. The assistant confirms the hardness and thickness of the diseased tissue and communicates it to the operator;

[0063] 5) After confirming that the tightening ring 3 is tightly holding the ferrule 2 and the ferrule 2 is tightly binding the diseased tissue, the handle assembly 6 is rotated, and the threaded front tube 51 and the rear tube 52 are disengaged from each other. Figure 4 and 6 As shown;

[0064] 6) Remove the outer tube 1, the cable 4 and the rear tube 52 from the clamp hole, and keep the tightening ring 3, the ferrule 2 and the front tube 51. The tightening ring 3 forces the ferrule 2 to tighten on the diseased tissue;

[0065] 7) At this time, when the diseased tissue is ligated by the loop 2, the forceps hole is vacated, and the operator can insert other instruments (for example, biopsy forceps, injection needles and mucosal incision knives, etc.) through the forceps hole to perform surgery; the tissues, tightening ring 3, loop 2 and front tube 51 remaining in the body can be removed with biopsy forceps and sampling forceps.

[0066] It is worth noting that the handle assembly 6 can also be equipped with a high-frequency electrical interface. If electrocuting is required, the high-frequency electrical interface of the snare is connected to the high-frequency electrical equipment. The high-frequency electrical interface can be electrically connected to the snare 2 through the front tube 51 and the rear tube 52. After power is turned on, electrocuting, electrocoagulation and other operations can be performed on the diseased tissue.

[0067] The above-mentioned ideal embodiments of the present invention are for inspiration. Through the above-mentioned description, relevant staff can make various changes and modifications without departing from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A tensioned and detachable snare, characterized in that: include: Outer tube (1); A ferrule (2) is sleeved with a tightening ring (3) elastically clamped to the outside of the ferrule (2); the front end of the tightening ring (3) is arranged opposite to the distal end of the outer tube (1); one end of the ferrule (2) is a snare portion (21) located outside the front end of the tightening ring (3); the other end is a connecting portion (22) located at the rear end of the tightening ring (3); and the area enclosed by the inner peripheral wall of the snare portion (21) is a snare hole (211); A cable (4) is disposed inside the outer tube (1) and is movable forward and backward; and a butt-jointed tube assembly (5), comprising a front tube (51) and a rear tube (52) which are detachably fixedly connected to each other, the front tube (51) and the connecting portion (22) being fixedly connected, and the front end of the cable (4) and the rear tube (52) being fixedly connected; when the cable (4) moves backward, the butt-jointed tube assembly (5) pulls the ferrule (2) so that the trap portion (21) gradually enters the tightening ring (3), so that the area of ​​the trap hole (211) of the trap portion (21) gradually decreases; when the cable (4) moves forward, the butt-jointed tube assembly (5) pushes the ferrule (2) so that the trap portion (21) gradually exits the tightening ring (3), so that the area of ​​the trap hole (211) of the trap portion (21) gradually increases; The ferrule (2) is formed by bending a core wire (2a) made of a metal material, a wire (2b) is provided on the core wire (2a), the wire 2b is a stainless steel wire, and the wire (2b) is spirally wound around the core wire (2a) along the length direction of the core wire (2a) to form a spiral groove (2c); The inner peripheral wall of the tightening ring (3) is provided with anti-slip teeth (31) for embedding into the spiral groove (2c); The snare has two functions of ligating and removing the diseased tissue; The ferrule (2) is used to remove diseased tissue; When the diseased tissue after ligation cannot be successfully removed by the loop (2), the pull rope (4) drives the rear tube (52) and the front tube (51) to gradually move away from each other until they are separated, and the tightening ring (3) forces the loop (2) to tighten on the diseased tissue, thereby continuing to maintain the ligation function on the diseased tissue.

2. The tensioned and detachable snare according to claim 1, characterized in that: The tightening ring (3) is elastic and is arranged so that the ferrule (2) can stay at any position on the moving path of entering or exiting the tightening ring (3).

3. The tensioned and detachable snare according to claim 1, characterized in that: One of the front tube (51) and the rear tube (52) is provided with an external thread section (521), and the other is provided with an internal thread section (511) matching the external thread section (521), and the external thread section (521) and the internal thread section (511) are threadedly connected.

4. The tensioned and detachable snare according to claim 3, characterized in that: The external thread segment (521) is an external thread segment (521) with a double thread, and the internal thread segment (511) is an internal thread segment (511) with a double thread.

5. The tensioned and detachable snare according to claim 1, characterized in that: The front tube (51) and the rear tube (52) are clamped together.

6. The tensioned and detachable snare according to claim 5, characterized in that: One of the front tube (51) and the rear tube (52) is provided with a plug (522), and the other is provided with a socket (512), and the plug (522) is snap-fitted into the socket (512); The plug (522) comprises a thick section (522a) connected to each other and a thin section (522b) having a smaller cross-sectional area than the thick section (522a); the socket (512) comprises a large hole (512a) connected to each other and a small hole (512b) having a smaller cross-sectional area than the large hole (512a); the butt-joint tube assembly (5) is elastically deformable at the location where the small hole (512b) is located, so as to allow the thick section (522a) to pass through the small hole (512b) and enter or leave the large hole (512a); when the plug (522) is snap-fitted into the socket (512), the thick section (522a) is located in the large hole (512a), and the thin section (522b) is located in the small hole (512b).

7. The tensioned and detachable snare according to claim 1, characterized in that: The wire (2b) is stainless steel wire.

8. The tensioned and detachable snare according to claim 1, characterized in that: The tightening ring (3) is made of TPU polyurethane.

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