CN119924945A - Tighten the detachable snare - Google Patents

Abstract

The present invention relates to the field of snare technology, in particular to a tensioned and detachable snare, comprising an outer tube, a ferrule, a cable and a butt joint tube assembly, wherein one end of the ferrule is a snare portion, and the other end is a connecting portion, and the area surrounded by the inner peripheral wall of the snare portion is a snare hole, and the butt joint tube assembly comprises a front tube and a rear tube that are detachably and fixedly connected to each other, and after the snare hole in the snare portion snares the diseased tissue, the cable is pulled backward to make the snare portion enter a tightening ring, and the area of the snare hole is reduced to snare the diseased tissue, and the tightening ring uses its own elasticity to hold the ferrule, and the outer tube, the cable and the rear tube can be withdrawn from the clamp channel hole, so that the clamp channel hole can be vacated when the ferrule snares the diseased tissue, so as to facilitate the entry of other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 joint tube assembly, the snare can be equipped with ferrules of various models and specifications, and has good interchangeability, and the surgeon can select a suitable loop head according to the hardness and thickness of the lesion to perform surgery.

Description

Tensioning detachable snare

The application is the divisional application of the patent with the application number of 202310439156.9

Technical Field

The invention relates to the technical field of snares, in particular to a tightening detachable snares.

Background

The snare mainly comprises a ferrule, a guy cable, a handle component and the like, and is matched with the endoscope when in use, and the handle component controls the ferrule through the guy cable so as to cut polyps or other superfluous tissues in the digestive tract;

In actual operation, the loop is inserted into the patient's alimentary canal through the forceps channel hole of the endoscope, and then the operator adjusts the position of the loop through the handle assembly to cover the polyp and resect the polyp, but in actual operation, the current loop device is difficult to successfully resect some thick and hard polyps, and because the forceps channel Kong Youhui of the endoscope is occupied by the loop device during operation, the operator cannot insert other instruments (such as biopsy forceps, injection needles, mucous membrane incision knives and the like) from the forceps channel hole to cooperate with the loop device under the condition that the polyps are bound by the loop device.

Disclosure of Invention

The invention aims to solve the technical problem that other instruments cannot be inserted into a forceps channel hole of an endoscope to be matched with a snare under the condition that a polyp is sleeved by the snare in the prior art, and provides a tightening detachable snare.

The technical scheme adopted by the invention for solving the technical problems is that the tightening detachable snare comprises:

An outer tube;

The device comprises a ferrule, a sleeve and a sleeve, wherein a tightening ring is sleeved outside the ferrule, the front end part of the tightening ring is opposite to the distal end part of the outer tube, one end of the ferrule is a sleeve part positioned outside the front end of the tightening ring, the other end of the ferrule is a connecting part positioned at the rear end of the tightening ring, and a region surrounded by the inner peripheral wall of the sleeve part is a sleeve hole;

The inhaul cable can be arranged in the outer tube in a forward and backward moving way;

The butt joint pipe group is provided with a front pipe and a rear pipe which are detachably and fixedly connected with each other, the front pipe is fixedly connected with the connecting part, the front end of the inhaul cable is fixedly connected with the rear pipe, when the inhaul cable moves backwards, the butt joint pipe group pulls the ferrule to enable the snare to gradually enter the tightening ring so that the area of the trepanning hole of the snare gradually becomes smaller, and when the inhaul cable moves forwards, the butt joint pipe group pushes the ferrule to enable the snare to gradually withdraw from the tightening ring so that the area of the trepanning hole of the snare gradually becomes larger.

Further, the gripping ring is resilient and arranged such that the ferrule can rest in any position on the path of movement into or out of the gripping ring.

Further, one of the front pipe and the rear pipe is provided with an external thread section, the other is provided with an internal thread section matched with the external thread section, and the external thread section and the internal thread section are in threaded connection.

Further, the external thread section is an external thread section of double-thread, and the internal thread section is an internal thread section of double-thread.

Further, the front pipe and the rear pipe are clamped.

Further, one of the front pipe and the rear pipe is provided with a plug, the other is provided with a jack, and the plug is clamped in the jack;

The plug comprises a thick section and a thin section, wherein the thick section and the thin section are connected with each other, the cross section area of the thin section is smaller than that of the thick section, the jack comprises a large hole and a small hole, the large hole and the small hole are connected with each other, the butt joint pipe group is located at the position where the small hole is located and can elastically deform to allow the thick section to enter or leave the large hole through the small hole, and 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.

Further, the ferrule is formed by bending a core wire made of a metal material, a wire is arranged 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.

Further, the inner peripheral wall of the tightening ring is provided with anti-slip teeth for being embedded into the spiral groove.

Further, the wire is a stainless steel wire.

Further, the material of the tightening ring is TPU polyurethane.

The detachable snare is pulled backwards after the loop is sleeved with the pathological tissue through the sleeve hole in the snare portion, so that the snare portion enters the tightening ring, the sleeve hole area is reduced to be sleeved with the pathological tissue, the tightening ring tightly holds the loop through the elasticity of the tightening ring, when the rear tube is detached from the front tube, the loop is still enabled to tighten the pathological tissue, meanwhile, the outer tube, the pull rope, the rear tube and the like can withdraw from the forceps hole, only the snare portion of the loop, the front tube and the tightening ring are reserved, the tightening ring is restrained on the pathological tissue, and therefore the forceps hole can be vacated under the condition that the loop is sleeved with the pathological tissue, and other instruments can enter into operations conveniently, namely, the snare can realize two functions of ligation and excision of the pathological tissue, and pathological tissue is excised under normal conditions.

Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the application, which proceeds with reference to the accompanying drawings.

Drawings

The invention will be further described with reference to the drawings and examples.

FIG. 1 is a schematic view of the tensioning of the detachable snare of the present invention;

FIG. 2 is an enlarged schematic view of a portion of FIG. 1A;

FIG. 3 is a schematic view of the snare portion having a gradually increasing area of the snare hole;

FIG. 4 is a schematic illustration of the female and male thread segments disengaged;

FIG. 5 is a schematic illustration of a plug and jack engaged;

FIG. 6 is a schematic view of the plug and jack disengaged;

FIG. 7 is a schematic illustration of the mating of the crimp ring with the ferrule;

Fig. 8 is an enlarged partial schematic view of B in fig. 7.

In the figure, 1, an outer tube;

2. ferrule, 21, snare part, 211, trepanning hole, 22, connecting part, 2a, core wire, 2b, wire, 2c, spiral groove;

3. A tightening ring, 31, anti-slip teeth;

4. A guy cable;

5, butt-joint pipe group, 51, front pipe, 511, internal thread section, 512, jack, 512a, big hole, 512b, small hole, 52, rear pipe, 521, external thread section, 522, plug, 522a, thick section, 522b, thin section;

6. handle assembly, 61, core bar, 62, slip ring.

Detailed Description

The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only those features which are relevant to the invention, and orientation and reference (e.g., up, down, left, right, etc.) may be used solely to aid in the description of the features in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.

As shown in fig. 1-8, a tightening detachable snare comprises an outer tube 1, a ferrule 2, a pull-cord 4, and a docking tube set 5;

the rear end of the outer tube 1 may be connected to the handle assembly 6, and the handle assembly 6 may specifically be any type of snare or a handle assembly 6 on an electric snare in the prior art, for example, the handle assembly 6 may include a core bar 61 and a slip ring 62, the rear end of the outer tube 1 is fixedly connected to the front end of the core bar 61, the slip ring 62 is slidably mounted on the core bar 61, and the rear end of the cable 4 is fixedly connected to the slip ring 62;

The ring 2 is sleeved with a tightening ring 3 which is elastically held tightly outside the ring 2, the front end part of the tightening ring 3 is opposite to the distal end part of the outer tube 1, one end of the ring 2 is a ring sleeve part 21 positioned outside the front end of the tightening ring 3, the other end of the ring 2 is a connecting part 22 positioned at the rear end of the tightening ring 3, and the area surrounded by the inner peripheral wall of the ring sleeve part 21 is a sleeve hole 211 for sleeve polyps or other pathological tissues;

The inhaul cable 4 can be arranged in the outer tube 1 in a back and forth moving way, but not limited to a steel wire rope or a synchronous rotating steel wire rope, the synchronous rotating steel wire rope can transmit long-distance load, has higher tensile strength, fatigue resistance, impact toughness resistance, good corrosion resistance and softness, and has good synchronous rotating performance, can transmit rotating force for a long distance, can precisely control the back and forth movement of the ferrule 2, and can drive the ferrule 2 to rotate, and the problems of operation delay and the like do not occur;

The butt-joint tube group 5 is provided with a front tube 51 and a rear tube 52, the front tube 51 is fixedly connected with the connecting part 22 of the ferrule 2, the front end of the guy cable 4 is fixedly connected with the rear tube 52, the front tube 51 is detachably and fixedly connected with the rear tube 52, when the guy cable 4 moves backwards as shown in fig. 1, the butt-joint tube group 5 pulls the ferrule 2 to enable the snare portion 21 to gradually enter the tightening ring 3 so that the area of the hitching hole 211 of the snare portion 21 is gradually reduced, and when the guy cable 4 moves forwards as shown in fig. 3, the butt-joint tube group 5 pushes the ferrule 2 to enable the snare portion 21 to gradually withdraw from the tightening ring 3 so that the area of the hitching hole 211 of the snare portion 21 is gradually increased.

The tightening detachable snare is characterized in that after a sleeve hole 211 in a snare part 21 is sleeved with pathological tissues, a pull rope 4 is pulled backwards to enable the snare part 21 to enter a tightening ring 3, the sleeve hole 211 is reduced in area to sleeve and tighten the pathological tissues, as shown in fig. 4, the tightening ring 3 is used for tightly clamping the snare 2 by self elasticity, so that when a rear tube 52 is detached from a front tube 51, the snare 2 is still tightened with pathological tissues, meanwhile, an outer tube 1, the pull rope 4, the rear tube 52 and the like can be withdrawn from a forceps channel hole, only the snare part 21, the front tube 51 and the tightening ring 3 of the snare 2 are reserved, and at the moment, the tightening ring 3 is restrained on the pathological tissues, so that the forceps channel hole can be vacated under the condition that the snare 2 is sleeved with the pathological tissues, and other instruments can enter the operation, meanwhile, the snare can be provided with the snare 2 with various types of specifications due to the detachable design of a butting tube group 5, and an operator can select a proper snare head according to the hardness and thickness of pathological tissues to perform the operation.

In some examples, the tightening ring 3 is elastic and is configured such that the ferrule 2 can stay at any position on the moving path into or out of the tightening ring 3, so as to prevent the ferrule 2 from slipping off the lesion tissue due to forward displacement of the ferrule 2 relative to the tightening ring 3 after the separation of the front tube 51 and the rear tube 52;

The material of the tightening ring 3 can be but not limited to TPU polyurethane, and has better hardness, elasticity, tearing strength and tensile strength, preferably, the material of the tightening ring 3 is medical TPU polyurethane, the outer circumferential surface of the tightening ring 3 is smooth, such as a cylindrical surface, the end surface of the tightening ring 3 is flat, such as a plane, and an inner hole formed by the inner circumferential surface of the tightening ring 3 and the outer circumferential surface of the tightening ring 3 are coaxially arranged without eccentricity.

Regarding the detachable fixed connection between the front tube 51 and the rear tube 52, the following detachable forms may be employed, but are not limited thereto:

In the first detachable form, as shown in fig. 2 and 4, one of the front pipe 51 and the rear pipe 52 is provided with an external thread section 521, the other is provided with an internal thread section 511 matched with the external thread section 521, that is, when the front pipe 51 is provided with the external thread section 521, the rear pipe 52 is provided with the internal thread section 511, when the front pipe 51 is provided with the internal thread section 511, the rear pipe 52 is provided with the external thread section 521, the external thread section 521 is in threaded connection with the internal thread section 511, when the rear pipe 52 is driven to rotate in one direction by the guy rope 4, the rear pipe 52 is screwed on the front pipe 51, and when the rear pipe 52 is driven to rotate in the other direction by the guy rope 4, the rear pipe 52 is gradually separated from the front pipe 51 until the guy rope 4 is separated, so as to accurately control the assembly and disassembly of the front pipe 51 and the rear pipe 52, and avoid the problems of operation delay and the like;

The external thread section 521 can also be an external thread section 521 with double threads, and the corresponding internal thread section 511 is an internal thread section 511 with double threads, wherein the external thread section 521 and the internal thread section 511 adopt double threads, the double thread lead is twice that of the single thread lead, the quick assembly and disassembly between the front pipe 51 and the rear pipe 52 can be realized, and the rear pipe 52 is smoother when being disassembled from the front pipe 51.

In a second detachable form, as shown in fig. 5 and 6, one of the front pipe 51 and the rear pipe 52 is provided with a plug 522, the other is provided with an insertion hole 512, and the plug 522 is clamped in the insertion hole 512, that is, when the plug 522 is arranged on the front pipe 51, the insertion hole 512 is arranged on the rear pipe 52, and when the insertion hole 512 is arranged on the front pipe 51, the plug 522 is arranged on the rear pipe 52;

Taking the jack 512 arranged on the front pipe 51 and the plug 522 arranged on the rear pipe 52 as an example, the plug 522 comprises a thick section 522 and a thin section 522b with a smaller cross section than the thick section 522a, which are connected with each other, the jack 512 comprises a big hole 512a and a small hole 512b with a smaller cross section than the big hole 512a, a step surface is formed between the big hole 512a and the small hole 512b, one end surface of the thick section 522a close to the step surface is in contact with, is abutted against or leaves a gap, the butt joint pipe group 5 is elastically deformed at the position of the small hole 512b so as to allow the thick section 522a to enter or leave the big hole 512a through the small hole 512b, a plurality of gaps are formed at intervals along the circumference of the rear end of the front pipe 51, and the gaps extend from the outer wall of the front pipe 51 to the inner wall of the small hole 512b, so that the thick section 522a can easily elastically deform to enter or leave the small hole 512b;

When the stay rope 4 drives the rear pipe 52 to move forwards, the plug 522 on the thick section 522a forces the front pipe 51 to elastically deform at the position of the small hole 512b until the thick section 522a completely reaches the large hole 512a, the thin section 522b is correspondingly positioned in the small hole 512b, so that the rear pipe 52 is clamped with the front pipe 51, when the stay rope 4 drives the rear pipe 52 to move backwards, the plug 522 on the thick section 522a moves towards the inside of the small hole 512b, so that the front pipe 51 elastically deforms at the position of the small hole 512b until the front pipe 51 completely leaves the small hole 512b, and the rear pipe 52 and the front pipe 51 are separated.

A third detachable form, in which a front pipe 51 and a rear pipe 52 are rotationally clamped, the rear pipe 52 is provided with a clamping column, the rear end part of the front pipe 51 is provided with a rotary clamping groove, the rotary clamping groove is provided with an inlet section parallel to the axis of the front pipe 51 and a circumferential section perpendicular to the axis of the front pipe 51, and the inlet section is communicated with the circumferential section;

During the clamping, the clamping column is aligned with the inlet section, then the rear pipe 52 is moved forwards until the clamping column reaches the circumferential section along the inlet section, then the rear pipe 52 is rotated to drive the clamping column to enter the circumferential section, so that the clamping column is staggered with the inlet section, further the front pipe 51 and the rear pipe 52 are rotationally clamped, during the disassembly, the rear pipe 52 is rotated to enable the clamping column to rotate to be aligned with the inlet section along the circumferential section, and then the rear pipe 52 is moved backwards, so that the rear pipe 52 is separated from the front pipe 51.

In some examples, as shown in fig. 7 and 8, the ferrule 2 is formed by bending a core wire 2a made of metal material, the core wire 2a is provided with a wire rod 2b, the material of the core wire 2a can be a shape memory alloy, so that the front end of the ferrule 2 can be automatically unfolded after leaving the tightening ring 3, the material of the core wire 2a can be nickel-titanium alloy, for example, a plurality of strands of nickel-titanium wires are braided or twisted to form the core wire 2a, the wire rod 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 ferrule 2 has the anti-slip characteristic, in some existing technologies, some polyps without pedicles, flat and poor in operation position easily have the problem of slipping when the snare is performed, thus affecting the normal operation, and some snares are inconvenient for medical staff to quickly adjust the state of the snares, and some snares cannot quickly recover after cutting a part of polyps, thus affecting the operation efficiency. Therefore, the ferrule 2 with the spiral wound wire 2b can perfectly solve the technical problems, because the spiral wound wire 2b not only can make the ferrule 2 have the anti-slip characteristic when the polyp is sleeved, the sleeve hole 211 in the sleeve portion 21 is beneficial to successfully sleeve some sessile, flat and poor-operative polyps, but also can increase the friction force between the ferrule 2 and the tightening ring 3, reduce or avoid the occurrence of the phenomenon that the ferrule 2 slips off the pathological tissues, and can also improve the restoring force of the ferrule 2, so that the sleeve portion 21 can be quickly restored when leaving the tightening ring 3.

In some examples, the inner peripheral wall of the tightening ring 3 is provided with anti-slip teeth 31 for being embedded in the spiral groove 2c, the material of the anti-slip teeth 31 is consistent with that of the tightening ring 3, the tightening effect of the tightening ring 3 on the snare portion 21 for sleeving human tissues can be greatly increased, loosening of the snare portion 21 after sleeving human tissues is avoided, the anti-slip teeth 31 can also be a barb structure gradually inclined towards the axis of the tightening ring 3 from front to back, so as to further prevent the snare portion 21 from being blocked from moving forwards after the snare portion 21 is forwards, loosening caused by forward movement is avoided, specifically, one end of each anti-slip tooth 31 is a fixed end fixedly connected with the inner peripheral wall of the winding ring 3 or integrally formed, the other end of each anti-slip tooth is a free end, an included angle between a connecting 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 °.

In some examples, the wire 2b is a stainless steel wire with a relatively good elastic capability, which on the one hand can increase the strength of the ferrule 2 and also increase the restoring force of the ferrule 2 and increase the restoring speed of the snare portion 21 when leaving the tightening ring 3.

The above-described tightening of the detachable snare operates as follows:

1) As shown in fig. 1 and 2, before the endoscope is inserted, during the test, the tightening ring 3 is not assembled on the ferrule 2, the handle assembly 6 drives the guy rope 4 to move back and forth, so that the ferrule 2 is pulled into or pushed out of the outer tube 1, the ferrule 2 generates a closing action when being pulled into the outer tube 1, and the ferrule 2 generates a unfolding action when being pushed out of the outer tube 1, so that no adverse condition is confirmed;

2) After the test is completed, as shown in fig. 2, the tightening ring 3 is sleeved from the front end of the ferrule 2, the tightening ring 3 is sleeved on the ferrule 2, at this time, most of the ferrule 2 is positioned at the front end of the tightening ring 3 and is in an unfolding state, then the snare part 21 is pinched by hands to enter a forceps channel hole of an endoscope, after the snare part passes through the forceps channel hole, the snare part 21 is unfolded, particularly, the ferrule made of shape memory alloy has a memory property, and the snare part 21 can be naturally unfolded in a preset state;

3) The movable handle assembly 6 drives the snare part 21 to move to the lesion tissue, the snare part 21 is sleeved on the lesion tissue, the slip ring 62 is operated to tighten the snare 2 at a certain speed, the pull rope 4 pulls the snare 2 to move backwards, and the tightening ring 3 is propped against the outer tube 1 to be kept still in the backward moving process of the snare 2, so that the snare part 21 of the snare 2 gradually enters the tightening ring 3;

4) When the snare portion 21 is tightened, the tightening ring 3 holds the snare 2 tightly so as to prevent the snare portion 21 from loosening after being sleeved on the pathological tissue, and an assistant confirms the hardness and the thickness of the pathological tissue and transmits the hardness and the thickness to an operator;

5) After confirming that the tightening ring 3 is tightened to the collar 2 so that the collar 2 is tightened to the lesion tissue, the handle assembly 6 is rotated and the screwed front tube 51 and rear tube 52 are disconnected from each other as shown in fig. 4 and 6;

6) Withdrawing the outer tube 1, the inhaul cable 4, the rear tube 52 and the like from the forceps channel hole, and reserving the tightening ring 3, the ferrule 2 and the front tube 51, wherein the tightening ring 3 forces the ferrule 2 to be tightened on pathological tissues;

7) At this time, when the lesion tissue is cannulated with the collar 2, a forceps hole is left, and the operator can insert other instruments (for example, biopsy forceps, injection needle, and mucous membrane incision knife) into the forceps hole to perform an operation, and can take out the tissue left in the body, the tightening ring 3, the collar 2, and the anterior tube 51 with the biopsy forceps and the sampling forceps.

It should be noted that the handle assembly 6 may also be provided with a high frequency electrical interface, which may be electrically connected to the ferrule 2 via the front and rear tubes 51, 52, and which may be electrically cut, coagulated, etc. the diseased tissue if electrical cutting is desired.

The above-described preferred embodiments according to the present invention are intended to suggest that, from the above description, various changes and modifications can be made by the worker in question without departing from the technical spirit of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims (8)

1. A tensioning detachable snare, characterized by: comprising the following steps:

An outer tube (1);

The device comprises a ferrule (2), a tightening ring (3) which is elastically held tightly outside the ferrule (2) is sleeved on the ferrule, the front end part of the tightening ring (3) is arranged opposite to the distal end part of an outer tube (1), one end of the ferrule (2) is a snare part (21) positioned outside the front end of the tightening ring (3), the other end of the ferrule is a connecting part (22) positioned at the rear end of the tightening ring (3), and a region surrounded by the inner peripheral wall of the snare part (21) is a trepanning hole (211);

a pull rope (4) which can move back and forth and is arranged in the outer tube (1);

The butt joint pipe group (5) is provided with a front pipe (51) and a rear pipe (52) which are detachably and fixedly connected with each other, the front pipe (51) is fixedly connected with the connecting part (22), the front end of the guy rope (4) is fixedly connected with the rear pipe (52), when the guy rope (4) moves backwards, the butt joint pipe group (5) pulls the ferrule (2) to enable the snare part (21) to gradually enter the tightening ring (3) so that the area of a nesting hole (211) of the snare part (21) gradually becomes smaller, and when the guy rope (4) moves forwards, the butt joint pipe group (5) pushes the ferrule (2) to gradually withdraw the snare part (21) from the tightening ring (3) so that the area of the nesting hole (211) of the snare part (21) gradually becomes larger;

The ferrule (2) is formed by bending a core wire (2 a) made of a metal material, a wire (2 b) is arranged on the core wire (2 a), the wire (2 b) is a stainless steel wire, and the wire (2 b) is spirally wound around the core wire (2 a) along the length direction of the core wire (2 a) to form a spiral groove (2 c);

the inner peripheral wall of the tightening ring (3) is provided with anti-slip teeth (31) which are used for being embedded into the spiral groove (2 c);

the snare has two functions of ligation and excision of lesion tissue;

The ferrule (2) is used for cutting off pathological tissues;

When the ligature lesion tissue cannot be successfully resected by the ferrule (2), the rear tube (52) and the front tube (51) are driven by the inhaul cable (4) to gradually separate until the rear tube and the front tube are separated, the ferrule (2) is forced to be tightly tightened on the lesion tissue by the tightening ring (3), and the ligature function on the lesion tissue is continuously maintained.

2. A tightening detachable snare according to claim 1, wherein the tightening ring (3) has elasticity and is arranged such that the snare (2) can stay in an arbitrary position on a moving path into or out of the tightening ring (3).

3. A tightening detachable snare according to claim 1, wherein one of the front tube (51) and the rear tube (52) is provided with an external thread section (521), 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 screwed.

4. A tightening of a detachable snare according to claim 3, wherein the external thread section (521) is a double threaded external thread section (521) and the internal thread section (511) is a double threaded internal thread section (511).

5. A taut detachable snare according to claim 1, wherein the front tube (51) and rear tube (52) are snap-fit.

6. The taut detachable snare according to claim 5, wherein 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), the plug (522) being snapped into the socket (512);

The plug (522) comprises a thick section (522 a) and a thin section (522 b) with a smaller cross-sectional area than the thick section (522 a), wherein the plug (522) comprises a large hole (512 a) and a small hole (512 b) with a smaller cross-sectional area than the large hole (512 a), the butt joint pipe group (5) is positioned at the position of the small hole (512 b) and can elastically deform so as to allow the thick section (522 a) to enter or leave the large hole (512 a) through the small hole (512 b), and when the plug (522) is clamped in the plug (512), the thick section (522 a) is positioned in the large hole (512 a), and the thin section (522 b) is positioned in the small hole (512 b).

7. A taut detachable snare according to claim 1, wherein the wire (2 b) is a stainless steel wire.

8. A tightening detachable snare according to claim 1, wherein the tightening ring (3) is of TPU polyurethane.