A snare device that can be quickly released

Abstract

The invention discloses a snare device that can be quickly released, comprising a handle, a guide wire, an unlocking piece and an outer sleeve; wherein the guide wire comprises a fixed end, a free end and a shaping section, the fixed end is fixed to the handle, the shaping section can be pre-shaped into a desired shape before surgery and can be straightened when subjected to a tensile force; the unlocking piece can be movably connected to the handle and has a locked state and an unlocked state, the free end is locked to the handle by the unlocking piece under the snare state, and the shaping section is in a ring shape; in the unlocked state, the unlocking piece releases the free end, the handle is subjected to an outward pulling force to drive the free end to separate from the handle, under the action of the pulling force, the shaping section and the free end are pulled into a straight line with the fixed end, and the guide wire is switched to a linear guide wire state. The snare guide wire can be quickly transformed from the snare state to the guide wire state in the blood vessel, which is convenient for rapid withdrawal of the snare guide wire during surgery.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a snare device that can be quickly released. Background Art

[0002] With the development of the medical industry, minimally invasive interventional surgery is becoming more and more popular, especially cardiovascular surgery, which uses stents and other devices. After the stent is delivered to the lesion site, if the stent needs to be unloaded, it is often necessary to use a snare guide wire to pull out the stent; or when the subclavian artery is acupunctured and fenestrated, it is difficult to acupuncture and fenestrate due to the obstruction of the stent. At this time, the snare guide wire is often needed to tighten the stent so that the stent is no longer close to the blood vessel wall, leaving the necessary space for acupuncture and fenestration. When in use, the snare guide wire is used to tighten the stent and other devices to achieve traction, tightening, and pulling out. Although the snare guide wire can solve key problems in these application scenarios, due to its own design defects, it also introduces new problems and risks, such as difficulty in releasing the snare guide wire from the stent. In addition, the existing snare guide wire usually does not have a release function, and it is always in a snare state before and after use. In this way, after the snare is pulled and tightened and the relevant instruments are pulled out, it is often compressed by instruments, tissues, etc., causing the snare to be unable to be separated from the instrument, making it difficult to remove the snare from the blood vessel, which will prolong the operation time and increase the risk of surgery. In order to facilitate the release of the snare guidewire, in existing surgeries, doctors often temporarily fold the guidewire in half to form a snare to form a snare guidewire, and use the snare guidewire to tighten the stent and other instruments to achieve pulling, tightening, and pulling out. Since the guidewire is temporarily folded in half, its two ends are not fixed, that is, the snare guidewire will not always be in the snare state before and after use, and the guidewire can be switched from the snare state to the guide wire state, thereby separating the snare guidewire from the instrument. However, in this method, on the one hand, the outer dimensions of the guidewire are not well matched with the inner cavity dimensions of the vascular sheath, which may cause serious bleeding; on the other hand, temporary bending of the guidewire may cause the guidewire to rupture, and the guidewire may be broken under stress during the operation, causing secondary damage to the patient. Therefore, the present invention is derived from this. Summary of the invention

[0003] In view of at least one of the above problems, the present invention aims to provide a snare device that can be quickly released, so that the snare guidewire can be quickly transformed from a snare state to a guidewire state in a blood vessel, thereby facilitating the rapid evacuation of the snare guidewire during surgery.

[0004] The technical solution of the present invention is:

[0005] The snare device capable of rapid release of the present invention comprises a handle, a guide wire, an unlocking member and an outer sleeve;

[0006] Wherein, the guide wire comprises a fixed end, a free end and a shaping section located between the fixed end and the free end, the fixed end is fixed to the handle, and the shaping section can be pre-shaped into a desired shape before surgery and can be straightened when subjected to a tensile force;

[0007] The unlocking member is movably connected to the handle and has a locked state and an unlocked state. When the unlocking member is switched from the locked state to the unlocked state, the free end is switched from being fixed to being released and can be separated from the handle under the action of a pulling force, and the guide wire is changed from a snare state to a guide wire state.

[0008] In the snaring state, the free end is locked on the handle by the unlocking member, the two ends of the shaping section are spaced side by side and are arranged in the opposite direction in the outer sleeve, and the middle part of the shaping section is exposed outside the end of the outer sleeve away from the handle and forms a ring shape;

[0009] In the unlocked state, the unlocking member releases the free end, and the handle is driven by the outward pulling force to drive the free end away from the handle, and under the action of the pulling force, the shaping section and the free end are pulled into a straight line with the fixed end, and the guide wire is switched to a linear guide wire state.

[0010] Optionally, the outer sleeve is a flexible tube;

[0011] A fixing hole with an axis parallel to the axis of the outer sleeve in the straight tube state is provided at a fixed position on the handle avoiding the fixed end. A clamping hole for clamping the free end is provided in the unlocking member. The unlocking member can rotate relative to the handle around a direction parallel to the axis of the outer sleeve in the straight tube state and move closer to or away from the outer sleeve, or can move linearly relative to the handle along a direction parallel to the axis of the outer sleeve in the straight tube state to move closer to or away from the outer sleeve, so as to compress or expand the clamping hole and enable the unlocking member to switch between the locked state and the unlocked state.

[0012] Optionally, the fixing hole includes a connecting hole and a locking hole arranged in sequence along its axial direction, the connecting hole is in a straight tube shape, and the inner diameter of the locking hole gradually decreases along the switching direction from the unlocked state to the locked state;

[0013] The unlocking member includes a connecting portion, a clamping portion and an operating portion. The connecting portion is in the shape of a straight tube and is connected to the inner wall of the connecting hole. The clamping hole is opened in the clamping portion. The clamping portion is squeezed by the inner wall of the locking hole in the direction of switching from the unlocking state to the locking state, and compresses the clamping hole to clamp the free end. The operating portion is always outside the fixing hole for the user to operate to realize the switching of the unlocking member between the locking state and the unlocking state.

[0014] Optionally, the unlocking member is threadedly matched with the fixing hole, the outer wall surface of the connecting portion has an external thread, and the inner wall surface of the connecting hole has a matching internal thread; or

[0015] An elastic buckle protruding outward is provided on the outer wall surface of the connecting part, and two clamping holes are opened on one side wall of the fixing hole, which are arranged at intervals along the axial direction of the fixing hole and penetrate the side wall. The elastic buckle selects to engage with one of the clamping holes in the locked state and the unlocked state respectively.

[0016] Optionally, the clamping portion includes at least two elastic clamping members arranged circumferentially along an end of the connecting portion away from the operating portion, one end of any one of the clamping members is fixed to the end of the connecting portion away from the operating portion, an avoidance groove extending in the direction of the extension line of the axis of the connecting portion is formed between any two adjacent ends of the clamping members away from the connecting portion, and a recessed portion extending in the direction of the extension line of the axis of the connecting portion and in an arc shape is formed on the inner side surface of any one of the clamping members, and all the recesses of all the clamping members define the clamping hole.

[0017] Optionally, the clamping hole passes through the clamping portion and extends through the connecting portion and the operating portion in sequence.

[0018] Optionally, the operating portion is disposed at an end of the handle away from the outer sleeve and the unlocking member is switched to a locked state when the clamping portion moves toward the outer sleeve.

[0019] Optionally, the outer sleeve is a flexible tube;

[0020] The unlocking member can rotate relative to the handle about an axis direction perpendicular to the outer sleeve in a straight tube shape, so as to switch the unlocking member between the locked state and the unlocked state;

[0021] In the snare state, the free end is wrapped around the unlocking member in the locked state.

[0022] Optionally, the outer sleeve has two guide holes spaced side by side and axially penetrating therein, and the shaping section includes a shaping body portion in the middle and penetrating portions at both ends;

[0023] In the trap state, the penetration parts at both ends of the shaping section are respectively penetrated in the two guide holes and are tightly matched with the inner walls of the corresponding guide holes, and any of the penetration parts overcomes the friction between it and the inner wall of the corresponding guide hole under the action of tension and moves relatively.

[0024] Optionally, the fixed end and the handle are fixedly connected as one body by insert injection molding, bonding or welding; and / or

[0025] The guide wire is made of memory metal material.

[0026] Compared with the prior art, the advantages of the present invention are:

[0027] The quickly releasable snare device of the present invention uses an unlocking piece arranged on the handle to quickly clamp or release the free end of the guide wire. In the unlocked state, the handle is pulled outward to drive the guide wire to move together, so that the snare state is quickly changed to the guide wire state, thereby realizing the rapid separation of the snare guide wire and the stent. The snare guide wire is connected in a mechanical manner and is tightly clamped by friction, which is safe and reliable and can achieve rapid release. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0029] Figure 1 This is an overall structural diagram of a snare device (a guide wire is in a snare state) that can be quickly released according to an embodiment of the present invention;

[0030] Figure 2 for Figure 1 A cross-sectional view of the middle handle and unlocking piece and a partial guide wire and outer sleeve;

[0031] Figure 3 A schematic structural diagram of one structure of an unlocking member of a snare device capable of quick release according to an embodiment of the present invention;

[0032] Figure 4 It is a partial structural schematic diagram of an outer sleeve and a guide wire according to an embodiment of the present invention;

[0033] Figure 5 It is a schematic diagram of a snare device that can be quickly released and a vascular sheath that cooperates with an interventional stent and a guide wire that is tightly wrapped around the stent according to an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the guidewire state of the quickly releasable snare device after being released according to an embodiment of the present invention.

[0035] Among them: 10, handle; 20, guide wire; 21, fixed end; 22, free end; 23, shaping section; 231, shaping body part; 232, penetration part; 30, unlocking piece; 31, connecting part; 32, holding part; 320, clamping piece; 321, avoidance groove; 33, operating part; 34, clamping hole; 40, outer sleeve; 41, guide hole; 50, blood sheath tube; 60, stent; 70, blood vessel. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0037] See also Figures 1 to 6 The snare device that can be quickly released according to the embodiment of the present invention includes a handle 10, a guide wire 20, an unlocking piece 30 and an outer sleeve 40. The guide wire 20 includes three parts: a free end 22 and a fixed end 21 located at both ends, and a shaping section 23 located in the middle. The fixed end 21 is fixed on the handle 10, that is, it is an integral structure with the handle 10. The guide wire 20 is made of a memory metal material such as a nickel-titanium alloy material, so that the shaping section 23 can be artificially shaped into a desired shape according to actual hand needs before surgery, and can be straightened under the action of external forces such as tension. For example, as Figure 1As shown, the shaping section 23 is shaped into a shape similar to an ear washing bulb, and the friction between the guide wire 20 and the bracket 60 is used to achieve the tightening of the bracket 60. The fixed end 21 is the entire part fixed in the handle 10, and the free end 22 is the part located in the handle 10 fixed by the unlocking member 30 when the guide wire 20 is in a entrapped state. In the embodiment of the present invention, the shaping section 23 does not only refer to the part exposed outside the outer sleeve 40, but all except the fixed end 21 and the free end 22. Therefore, the shaping section 23 in the embodiment of the present invention includes the parts at both ends that are inserted into the outer sleeve (for the convenience of description, these two parts are described as the insertion part 232) and the main body part located in the middle that can be pre-shaped before surgery (similarly, for the convenience of description, this part is described as the shaping body part 231). It should be noted that the outer tube 40 in the embodiment of the present invention is a flexible tube such as a conventional medical silicone tube currently available on the market, and the penetration portion 232 is not completely fixed in the outer tube 40, but can be pulled out of the outer tube 40, that is, the penetration portion 232 is movably penetrated in the outer tube 40, and can be moved in and out of the outer tube 40 according to the tightness of the sleeve to adjust the size of the ring and thus adjust the tightness of the sleeve. The unlocking member 30 is movably connected to the handle 10 and has a locked state and an unlocked state. When the unlocking member 30 is switched from the locked state to the unlocked state, the free end 22 is switched from being fixed to being released and can be separated from the handle 10 under the action of a pulling force, and the guide wire 20 is changed from the snare state to the guide wire state. In the entrapped state, the free end 22 is locked on the handle 10 by the unlocking member 30, and the two ends of the shaping section 23, namely the penetration parts 232, are spaced side by side and penetrated in the outer sleeve 40 in opposite directions. The middle part of the shaping section 23, namely the shaping body part 231, is exposed outside the end of the outer sleeve 40 away from the handle 10 and forms a ring shape, which can be tightly wrapped around the bracket 60 and other instruments. In the unlocked state, the unlocking member 30 releases the free end 22, that is, the free end 22 is no longer locked. At this time, the free end 22 is no longer constrained by the unlocking member 30, and the operator can pull the handle 10 outward, that is, in the direction away from the outer sleeve 40. Since the fixed end 21 of the guide wire 20 is fixed to the handle 10 as a whole, and the entire guide wire 20 (including the fixed end 21, the shaping section 23 and the free end 22) are integrated, the free end 22 is not constrained when the unlocking member 30 is in the unlocked state, so it can be pulled together with the handle 10 when it is pulled outward. The handle 10 is pulled out and the connection between the penetration portion 232 and the outer sleeve 40 is movably connected, and is not fixed. The pulling force is sufficient to overcome the friction between the penetration portion 232 and the outer sleeve 40, so that the penetration portion 232 on one side of the free end 22 is disengaged from the outer sleeve 40, and the shaping section 23 enters into the outer sleeve 40 and is straightened under the action of the pulling force, so that the free end 22 can be pulled together with the shaping section 23 to be in the same straight line with the fixed end 21, thereby realizing the switching of the guide wire 20 from the snare state to the guide wire state.In the snare device of the embodiment of the present invention, the guide wire 20 can be quickly switched from the snare state to the guide wire state during the operation, so as to realize the release function of the snare guide wire 20, and the structure is simple and the operation is also convenient.

[0038] According to some preferred embodiments of the present invention, the unlocking member 30 can rotate relative to the handle 10 around an axis parallel to the outer sleeve in a straight tube state (because the outer sleeve 40 in the embodiment of the present invention is a hose and can be bent, the outer sleeve 40 in a straight tube state is used for description) and move toward or away from the outer sleeve 40. Exemplarily, the unlocking member 30 is threadedly connected to the handle 10, and the unlocking member 30 can rotate relative to the handle 10 and move toward or away from the outer sleeve 40, thereby realizing the switching of the unlocking member 30 between the unlocked state and the locked state. More specifically, as Figure 2 and Figure 3 As shown, a fixing hole (not marked) with an axis parallel to the axis of the outer sleeve 40 in the straight tube state is opened at a fixed position of the handle 10 away from the fixed end 21. The fixing hole includes a connecting hole (not marked) and a locking hole (not marked) arranged in sequence along its axial direction. The connecting hole is in the shape of a straight tube, and the inner diameter of the locking hole gradually decreases along the switching direction from the unlocked state to the locked state. That is, the locking hole is in the switching direction from the unlocked state to the locked state, that is, Figure 2 The tapered hole shown is a tapered hole that tapers from bottom to top. Correspondingly, the unlocking member 30 includes a connecting portion 31, a clamping portion 32 and an operating portion 33. The connecting portion 31 is also in the shape of a straight tube and is connected to the inner wall of the connecting hole. The clamping portion 32 is squeezed by the inner wall of the locking hole in the direction of switching from the unlocking state to the locking state and contracts to clamp the free end 22. That is to say, the clamping portion 32 is also in the shape of a cone like the locking hole. The operating portion 33 is located at one end of the connecting portion 31 away from the clamping portion 32. The operating portion 33 is used for the user to operate so that the unlocking member 30 moves relative to the handle 10 and thus switches the unlocking member 30 between the unlocking state and the locking state. The operating portion 33 is always outside the fixing hole, so that it is convenient for the operator to operate. In the embodiment of the present invention, the connecting portion 31 and the connecting hole are preferably connected by a threaded connection, which has a simple structure, is easy to process and is easy to operate. As a replaceable embodiment, the connection portion 31 and the connecting hole can also be connected in other ways, such as snap-fitting. An elastic snap (not shown) is provided on the connection portion 31. In this case, two through and spaced snap holes (not shown) can be opened on the side wall of the fixing hole. The elastic snap can be snapped with one of the snap holes in the unlocked state and the locked state respectively. That is to say, one of the snap holes serves as a hole for snapping with the elastic snap in the unlocked state, and the other serves as a hole for snapping with the elastic snap in the locked state. In this embodiment, the unlocking member 30 can move linearly relative to the handle 10 toward or away from the outer sleeve 40 along a direction parallel to the axis of the outer sleeve in the straight tube state. In the above two embodiments, the operating portion 33 is preferably arranged as follows: Figure 2 The handle 10 shown is on the end away from the outer sleeve, that is, when the unlocking member 30 moves toward the outer sleeve 40, the unlocking state can be switched to the locked state. Optionally, the operating portion 33 can also be arranged on the side of the handle 10 close to the outer sleeve 40. In this case, when the unlocking member 30 moves in the direction away from the outer sleeve 40, the unlocking state can be switched to the locked state. The clamping portion 32 in the above two embodiments includes at least two elastic clamping members 320 circumferentially spaced along one end of the connecting portion 31 away from the operating portion 33. For example, as Figure 3 As shown, in the embodiment of the present invention, there are three clamping members 320, and there is a gap between any adjacent clamping members 320. The gap extends along the extension line direction of the axis of the connecting portion 31, that is, extends along the end of the clamping portion 32 away from the connecting portion 31 toward the connecting portion 31 to provide an escape space for the clamping portion 32 to shrink under the extrusion of the locking hole. In the locked state, the escape groove 321 is squeezed and becomes smaller or even non-existent. Since the clamping member 320 is elastic, when the extrusion of the locking hole is released, that is, switched to the unlocked state, the clamping member 320 is reset under the elastic action, that is, reset outward, and the gap between adjacent clamping members 320 is restored. The inner side surface of any clamping member 320 is provided with an arc-shaped recess extending along the extension line direction of the axis of the connecting portion 31 and radially concave outward, that is, an arc-shaped recess. The arc-shaped recesses on the inner side surfaces of at least two clamping members 320 can enclose a clamping hole 34 with a circular cross section for the free end 22 to clamp. Optionally, in the embodiment of the present invention, the clamping hole 34 only passes through the clamping portion 32. As a preferred embodiment, the clamping hole 34 passes through the clamping portion 32 and extends through the connecting portion 31 and the operating portion 33 in sequence, that is, the clamping hole 34 passes through the entire unlocking member 30. Such a design can facilitate the user to manipulate the free end 22 of the guide wire 20 through the clamping hole 34 at the operating portion 33, and can facilitate the size of the loop when the guide wire 20 is in the snare state to tighten the bracket 60 or other instruments. In another alternative embodiment, the unlocking member 30 can be rotated relative to the handle 10 around an axial direction perpendicular to the outer sleeve 40 in a straight tube shape to achieve the switching of the unlocking member 30 between the locked state and the unlocked state. That is to say, the fixing hole can be set on the side of the handle 10, that is, as shown in the example Figure 2The axes of the fixing holes shown are perpendicular to each other and are in the left-right direction, not in the up-down direction. In this case, the free end 22 of the guide wire 20 in the snare state is wound around the unlocking member 30 in the locked state. Exemplarily, the unlocking member 30 includes a screw-shaped winding member (not shown) and a latch member (not shown) similar to a latch. The winding member and the fixing hole in the handle 10 are rotationally matched, but the relative axial positions of the two do not change, and a winding groove (not shown) is opened on the outer wall surface of the winding member. In the snare state, the free end 22 is wound around the winding groove on the unlocking member 30. The latch member is used to lock the winding member on the handle 10 in the locked state, so that the winding member is fixed relative to the handle 10 to prevent the winding member from rotating in the opposite direction. When unlocking, it is only necessary to remove the latch member from the winding member. The specific structure and working principle are not described or limited.

[0039] According to some preferred embodiments of the present invention, Figure 4 As shown, two guide holes 41 spaced side by side and axially penetrated are provided in the outer sleeve 40. In the snare state, the two ends of the shaping section 23, namely the penetration parts 232, are respectively penetrated in the two guide holes 41 in a one-to-one correspondence and each penetration part 232 is tightly matched with the inner wall of the corresponding guide hole 41, that is, there is no gap between the penetration part 232 and the guide hole 41, which can effectively prevent blood leakage. It should be noted that the penetration part 232 of the guide wire 20 can slide in the guide hole 41, so that the penetration part 232 on the side of the free end 22 can be pulled out of the guide hole 41 and be in the same straight line with the fixed end 21. Similarly, the shaping section can also be pulled into the guide hole 41 of the outer sleeve 40 close to the fixed end 21 and straightened. That is to say, there is a certain friction between the penetration portion 323 and the inner wall of the guide hole 41 to ensure that blood does not penetrate therebetween, and a certain force such as pulling force or pushing force is needed to overcome the friction between the guide wire 20 and the inner wall of the guide hole 41 so that the guide wire 20 can be separated from the guide hole 41 of the outer tube 40. The specific friction force is not limited and can be selected and designed according to actual needs.

[0040] According to some preferred embodiments of the present invention, the fixed end 21 of the guide wire 20 is fixedly connected to the handle 10 as a whole by insert injection molding, bonding or welding.

[0041] The snare device of the embodiment of the present invention, such as Figure 5As shown, when in use, the guide wire 20 is placed in the outer sleeve 40 and formed into a snare state, the shaping section 23, more specifically the shaping body part 231, is pre-shaped into a shape matching the stent 60 and tightly wraps the stent 60, the unlocking piece 30 is switched to a locked state, and then inserted into the sheath of the blood vessel 70 together, the shaping body part 231 of the shaping section 23 tightly wraps the stent 60 so that the stent 60 does not adhere to the wall of the blood vessel 70, and the stent 60 is smoothly inserted into or out of the lesion position. When the guide wire 20 needs to be released, the unlocking member 30 is switched to the unlocking state so that the free end 22 of the guide wire 20 is no longer constrained. The operator, such as a doctor, pulls the handle 10 outward, and the handle 10 drives the free end 22 to be separated from the handle 10, the outer sleeve 40, and the bracket 60 in sequence. The shaping body part 231 of the shaping section 23 and the penetration part 232 connected to the free end 22 are pulled together into the guide hole 41 in the outer sleeve 40 near the fixed end 21 and are straightened, so that the fixed end 21, the shaping section 23 and the free end 22 are formed as shown in FIG. Figure 6 The straight guidewire state shown is convenient for doctors to quickly extract the snare guidewire from the body, reducing the risk of manual operation and the operation time. In the guidewire state, the guidewire 20 is no longer tightly wrapped around the stent 60 and is separated from the stent 60. At this time, the pulling force of the handle 10 is canceled, and the guidewire 20 and the outer sleeve 40 are not completely separated due to the friction. Finally, the entire snare device enters the sheath of the blood vessel 70 and is taken out of the patient's body together, and finally the blood vessel 70 sheath is separated from the snare device. The doctor does not need to use other tools when releasing the guidewire 20. The guidewire 20 is connected mechanically and tightened by friction, which is safe and reliable and can be released quickly.

[0042] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A snare device that can be quickly released, characterized in that: It includes a handle, a guide wire, an unlocking piece and an outer sleeve; Wherein, the guide wire comprises a fixed end, a free end and a shaping section located between the fixed end and the free end, the fixed end is fixed to the handle, and the shaping section can be pre-shaped into a desired shape before surgery and can be straightened when subjected to a tensile force; The unlocking member is movably connected to the handle and has a locked state and an unlocked state. When the unlocking member is switched from the locked state to the unlocked state, the free end is switched from being fixed to being released and can be separated from the handle under the action of a pulling force, and the guide wire is changed from a snare state to a guide wire state. In the snaring state, the free end is locked on the handle by the unlocking member, the two ends of the shaping section are spaced side by side and are arranged in the opposite direction in the outer sleeve, and the middle part of the shaping section is exposed outside the end of the outer sleeve away from the handle and forms a ring shape; In the unlocked state, the unlocking member releases the free end, and the handle is driven by the outward pulling force to drive the free end away from the handle, and under the action of the pulling force, the shaping section and the free end are pulled into a straight line with the fixed end, and the guide wire is switched to a linear guide wire state.

2. The quick-release snare device according to claim 1, characterized in that: The outer sleeve is a flexible tube; A fixing hole with an axis parallel to the axis of the outer sleeve in the straight tube state is provided at a fixed position on the handle avoiding the fixed end. A clamping hole for clamping the free end is provided in the unlocking member. The unlocking member can rotate relative to the handle around a direction parallel to the axis of the outer sleeve in the straight tube state and move closer to or away from the outer sleeve, or can move linearly relative to the handle along a direction parallel to the axis of the outer sleeve in the straight tube state to move closer to or away from the outer sleeve, so as to compress or expand the clamping hole and enable the unlocking member to switch between the locked state and the unlocked state.

3. The quick-release snare device according to claim 2, characterized in that: The fixing hole includes a connecting hole and a locking hole arranged in sequence along the axial direction thereof, the connecting hole is in a straight tube shape, and the inner diameter of the locking hole gradually decreases along the switching direction from the unlocked state to the locked state; The unlocking member includes a connecting portion, a clamping portion and an operating portion. The connecting portion is in the shape of a straight tube and is connected to the inner wall of the connecting hole. The clamping hole is opened in the clamping portion. The clamping portion is squeezed by the inner wall of the locking hole in the direction of switching from the unlocking state to the locking state, and compresses the clamping hole to clamp the free end. The operating portion is always outside the fixing hole for the user to operate to realize the switching of the unlocking member between the locking state and the unlocking state.

4. The quick-release snare device according to claim 3, characterized in that: The unlocking member is threadedly matched with the fixing hole, the outer wall surface of the connecting portion has an outer thread, and the inner wall surface of the connecting hole has a matching inner thread; or An elastic buckle protruding outward is provided on the outer wall surface of the connecting part, and two clamping holes are opened on one side wall of the fixing hole, which are arranged at intervals along the axial direction of the fixing hole and penetrate the side wall. The elastic buckle selects to engage with one of the clamping holes in the locked state and the unlocked state respectively.

5. The quickly releasable snare device according to claim 3 or 4, characterized in that: The clamping portion includes at least two elastic clamping members arranged circumferentially along one end of the connecting portion away from the operating portion, one end of any one of the clamping members is fixed to the end of the connecting portion away from the operating portion, an avoidance groove extending in the direction of the extension line of the axis of the connecting portion is formed between any two adjacent ends of the clamping members away from the connecting portion, and an arc-shaped recess extending in the direction of the extension line of the axis of the connecting portion is formed on the inner side surface of any one of the clamping members, and all the recesses of all the clamping members define the clamping hole.

6. The quick-release snare device according to claim 5, characterized in that: The clamping hole passes through the clamping portion and extends through the connecting portion and the operating portion in sequence.

7. The quick-release snare device according to claim 3, characterized in that: The operating part is arranged at one end of the handle away from the outer sleeve and the unlocking member is switched to a locked state when the holding part moves toward the outer sleeve.

8. The quick-release snare device according to claim 1, characterized in that: The outer sleeve is a flexible tube; The unlocking member can rotate relative to the handle about an axis direction perpendicular to the outer sleeve in a straight tube shape, so as to switch the unlocking member between the locked state and the unlocked state; In the snare state, the free end is wrapped around the unlocking member in the locked state.

9. The quick-release snare device according to claim 1, characterized in that: The outer sleeve has two guide holes spaced side by side and axially penetrated therein, and the shaping section includes a shaping body portion in the middle and penetrating portions at both ends; In the trap state, the penetration parts at both ends of the shaping section are respectively penetrated in the two guide holes and are tightly matched with the inner walls of the corresponding guide holes, and any of the penetration parts overcomes the friction between it and the inner wall of the corresponding guide hole under the action of tension and moves relatively.

10. The quick-release snare device according to claim 1, characterized in that: The fixed end and the handle are fixedly connected as one body by insert injection molding, bonding or welding; and / or The guide wire is made of memory metal material.

Images