Thread cutter

Abstract

This invention relates to a suture cutter for cutting sutures, comprising a handle, a tube, a connecting member, a suture adjusting mechanism, and a cutter. The proximal end of the tube is connected to the handle; the connecting member is connected to the distal end of the tube, and the connecting member can be slidably threaded through the suture and can slide on the suture under a pushing force; the suture adjusting mechanism is movably mounted on the handle and can be detachably connected to the suture. When connected to the suture, the suture adjusting mechanism can move relative to the handle under an external force to tension the suture. After tensioning, and after the external force is removed, the suture adjusting mechanism is limited on the handle and remains stationary relative to the handle, thereby locking the relative position of the handle and the suture; the cutter is slidably mounted on the connecting member and can slide on the connecting member under a driving force, thereby cutting the suture threaded through the connecting member. The suture cutter of this invention helps to reduce the length of sutures retained in the patient's body.

Description

Technical Field

[0001] This invention relates to the technical field of medical devices, and more particularly to a wire cutter. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] In some surgeries that require tying knots, the excess suture attached to the knot needs to be cut after the knot is tied. For example, in the implantation of a biodegradable PFO occluder (patent foramen ovale), after the pre-formed knot of the occluder is locked, the suture attached to the knot is cut, and the excess suture is then removed from the patient's body. When using a common suture cutter to cut the suture attached to the knot, a relatively long portion of the suture remains attached to the knot and remains inside the patient's body. The longer the suture remains in the body, the greater the risk of thrombosis. Summary of the Invention

[0004] Therefore, it is necessary to provide a thread cutter that helps reduce the length of thread left in the patient's body.

[0005] A wire cutter for cutting wire, comprising:

[0006] handle;

[0007] A tube body, the proximal end of which is connected to the handle;

[0008] A connecting member is connected to the distal end of the tube body. The connecting member can be slidably passed through the line body and can slide on the line body under the action of thrust.

[0009] A cable adjusting mechanism is detachably connected to the cable extending from the connecting member. The cable adjusting mechanism is movably mounted on the handle. When the cable adjusting mechanism is connected to the cable, it can move relative to the handle under the action of an external force to tension the cable. After the cable adjusting mechanism has tensioned the cable and the external force has been removed, the cable adjusting mechanism is limited on the handle and remains stationary relative to the handle, so that the relative position of the handle and the cable is locked in the direction from the distal end to the proximal end.

[0010] A cutting tool is slidably disposed on the connecting member. Under the action of a driving force, the cutting tool can slide on the connecting member to cut the wire passing through the connecting member.

[0011] During the use of the aforementioned wire cutter, after the thread is threaded through the distal end of the connecting member, the distal end of the connecting member slides under the action of external force and abuts against the knot, thereby locking the relative position of the connecting member, the locking wire, and the adjusting wire in the direction from the proximal end to the distal end. After the distal end of the connecting member abuts against the knot of the locking wire, the adjusting mechanism connects with the thread passing through the connecting member. The adjusting mechanism is wound around the thread under the action of external force to tighten the thread, and after the external force is removed, the adjusting mechanism is limited on the handle and remains stationary relative to the handle, thereby locking the relative position of the handle and the thread in the direction from the distal end to the proximal end.

[0012] With the relative positions of the connecting component and the thread locked in the direction from the proximal end to the distal end, and the relative positions of the handle and the thread locked in the direction from the distal end to the proximal end, the thread cutter and the thread form a unified structure. This unified structure moves synchronously with the heartbeat. During this synchronous movement, the relative motion between the thread cutter and the thread is small or nonexistent. This helps avoid a large relative motion between the thread cutter and the thread, which would cause the blade to be far from the knot when cutting the thread. Consequently, it helps to reduce the distance between the cut and the knot, thus minimizing the length of the thread remaining in the patient's body (i.e., the distance from the cut of the locking thread and the adjusting thread to the knot), thereby reducing the risk of thrombosis in the remaining portion of the thread. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] in:

[0015] Figure 1 This is a state diagram of the implantation process of a biodegradable occluder in one embodiment;

[0016] Figure 2 for Figure 1 Enlarged view of A in the middle;

[0017] Figure 3 A perspective view of a wire cutter according to one embodiment;

[0018] Figure 4 for Figure 3 Enlarged view of B in the middle;

[0019] Figure 5This is a diagram showing the state in which the distal end of the wire cutter abuts against the knot during use, according to one embodiment.

[0020] Figure 6 for Figure 5 Enlarged view of C in the middle;

[0021] Figure 7 A cross-sectional view of a wire cutter in one embodiment when the distal end of the wire cutter abuts against a knot;

[0022] Figure 8 A cross-sectional view of a wire cutter cutting a wire body according to an embodiment;

[0023] Figure 9 A cross-sectional view of a connecting member according to one embodiment;

[0024] Figure 10 This is a schematic diagram of the structure of a wire cutter according to one embodiment;

[0025] Figure 11 A perspective view of a fixed handle according to one embodiment;

[0026] Figure 12 for Figure 10 Sectional view along DD;

[0027] Figure 13 for Figure 12 Enlarged view of E in the middle;

[0028] Figure 14 A cross-sectional view of a portion of the structure of a wire cutter according to an embodiment;

[0029] Figure 15 for Figure 12 Enlarged view of F in the middle;

[0030] Figure 16 This is an exploded perspective view of the movable handle and the cable adjustment mechanism in one embodiment;

[0031] Figure 17 This is a cross-sectional view of a unidirectional tooth in one embodiment;

[0032] Figure 18 This is a partial cross-sectional view of the wire cutter section structure in a stereoscopic view, representing another embodiment. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of the embodiments of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0036] In the field of interventional medical devices, the end of a medical device implanted in the human or animal body that is closer to the operator is generally called the "proximal end," and the end that is farther from the operator is called the "distal end." Based on this principle, the "proximal end" and "distal end" of any component of a medical device are defined. "Axial direction" generally refers to the length of the medical device during delivery, while "radial direction" generally refers to the direction of the medical device that is not parallel to its "axial direction." Based on this principle, the "axial direction" and "radial direction" of any component of a medical device are defined. "Circumferential direction" refers to the circumferential direction, that is, the axial direction surrounding a tubular structure or cylinder.

[0037] Please refer to the following: Figure 1 and Figure 2 This embodiment uses the locking wire 11 and adjusting wire 12 of the biodegradable plug 100 as examples to illustrate the technical solution involved in this embodiment. Specifically, in this embodiment, the wire cutter 300 (see...) Figure 3 The cut lines are the locking line 11 and the adjusting line 12 of the biodegradable plug 100. In the attached drawings, to distinguish between the locking line 11 and the adjusting line 12, the locking line 11 is shown in red and the adjusting line 12 is shown in blue.

[0038] Since this embodiment uses the wire cutter 300 to cut the locking wire 11 and adjusting wire 12 of the biodegradable occluder 100, in order to better understand the technical solution of the wire cutter 300 in this embodiment, before describing the structure of the wire cutter 300, the implantation process of the biodegradable occluder 100 will be briefly described.

[0039] Please refer to the following: Figure 1 and Figure 2 During the implantation of the biodegradable occluder 100, a delivery channel is first established from inside the patient's body to the outside via the delivery sheath 200, and then the biodegradable occluder 100 is delivered to the implantation site through the delivery channel. Throughout the implantation process, the proximal ends of the locking wire 11 and the adjustment wire 12 remain outside the patient's body. After the biodegradable occluder 100 is placed at the implantation site, the locking wire 11 and the adjustment wire 12 extend from the implantation site through the delivery channel to the outside of the patient's body.

[0040] After the biodegradable occluder 100 achieves the desired shape at the implantation site, the locking wire 11 is retracted, thereby forming a shape on the adjustment wire 12 as shown. Figure 2 The knot 13 shown is used to lock the position of the adjustment line 12, thereby fixing the shape of the biodegradable occluder 100. Then, using a suture cutter, the adjustment line 12 and the locking line 11 are cut near the knot 13 by being delivered along the delivery channel of the delivery sheath 200. The portion of the adjustment line 12 and the locking line 11 located in the patient's body from the proximal end to the cut is then removed from the patient's body.

[0041] Please see Figure 3 This disclosure discloses a thread cutter 300, the distal end of which can be inserted into the patient's body to cut the portions of the locking thread 11 and the adjusting thread 12 located near the knot 13.

[0042] Please refer to the following: Figure 3 and Figure 4 One embodiment of the wire cutter 300 includes a handle 31, a tube 32, a connecting member 33, a wire adjusting mechanism 34, and a cutter 35.

[0043] The handle 31 is connected to the proximal end of the tube body 32, allowing the operator to hold it.

[0044] The tube 32 extends axially to facilitate insertion into the patient's body. The tube 32 is designed for... Figure 4 The connecting member 33 shown in the figure is a load-bearing structure, and the far end of the tube body 32 is connected to the connecting member 33.

[0045] Please see Figure 4 The connecting member 33 has a distal end 331, and the proximal end of the connecting member 33 is inserted into the tube body 32 and fixedly connected to the tube body 32. During use, the connecting member 33 can be slidably threaded through the locking wire 11 and the adjusting wire 12. After the connecting member 33 is slidably threaded through the locking wire 11 and the adjusting wire 12, it can slide into the delivery sheath 200 under external force, and can slide until its distal end 331 abuts against the knot 13.

[0046] Back Figure 3 The cable adjusting mechanism 34 is movably mounted on the handle 31, and can move relative to the handle 31 under the action of an external force. After the external force is removed, the cable adjusting mechanism 34 is limited on the handle 31 and remains stationary relative to the handle 31. During use, the cable adjusting mechanism 34 can be detachably connected to the locking wire 11 that passes through the connecting member 33.

[0047] Back Figure 4 The cutting tool 35 is slidably disposed on the connecting member 33. Under the action of driving force, the cutting tool 35 slides on the connecting member 33, thereby cutting the locking line 11 and the adjusting line 12 passing through the connecting member 33.

[0048] The usage process of the wire cutter 300 in this embodiment is as follows:

[0049] After the knot 13 formed by the locking wire 11 of the biodegradable occluder 100 locks the adjusting wire 12, the operator operates on the proximal ends of the locking wire 11 and the adjusting wire 12 outside the patient's body and on the connecting member 33 to allow the connecting member 11 to be slidably threaded through by the locking wire 11 and the adjusting wire 12.

[0050] Please refer to the following: Figure 5 and Figure 6 After the connecting member 33 is slidably threaded through the locking wire 11 and the adjusting wire 12, the operator applies a pushing force to the handle 31 or the tube 32 to make the connecting member 33 slide along the locking wire 11 and the adjusting wire 12, and enter the patient's body through the delivery channel of the delivery sheath 200, and make the connecting member 33 slide to such a position. Figure 6 The distal end 331 shown abuts against the knot 13, thereby locking the relative position of the connecting member 33 with the locking line 11 and the adjusting line 12 in the proximal-to-distal direction. In other embodiments, the connecting member 33 can also be operated to slide on the locking line 11 and the adjusting line 12, so that the distal end 331 abuts against human tissue, thereby locking the relative position of the connecting member 33 with the locking line 11 and the adjusting line 12 in the proximal-to-distal direction.

[0051] After the distal end 331 of the connecting member 33 abuts against the knot 13, the locking wire 11 and adjusting wire 12, which pass through the connecting member 33, are connected to the adjusting mechanism 34. Then, with the adjusting mechanism 34 connected to the locking wire 11 and adjusting wire 12, an external force is applied to the adjusting mechanism 34 to move it relative to the handle 31, thereby tensioning the locking wire 11 and adjusting wire 12. After the locking wire 11 and adjusting wire 12 are in a tensioned state, the external force applied to the adjusting mechanism 34 is released, and the adjusting mechanism 34 is limited on the handle 31 and remains stationary relative to the handle 31, thereby locking the relative position of the handle 31 and the locking wire 11 and adjusting wire 12 in the direction from the distal end to the proximal end.

[0052] With the relative positions of the connecting member 33 and the locking line 11 and the adjusting line 12 locked in the proximal-to-distal direction, and the relative positions of the handle 31 and the locking line 11 and the adjusting line 12 locked in the distal-to-proximal direction, the operator applies a driving force to the tool 35, causing the tool 35 to move on the connecting member 33. Figure 7 Slide to the position shown Figure 8 At the indicated location, the locking wire 11 and adjusting wire 12 on the connecting member 33 are then cut. After the locking wire 11 and adjusting wire 12 are cut, the operator removes the portion of the locking wire 11 and adjusting wire 12 from the proximal end to the cut opening out of the patient's body.

[0053] During the use of the aforementioned cutting tool 35 to cut the locking wire 11 and adjusting wire 12, the relative positions of the connecting member 33 and the locking wire 11 and adjusting wire 12 are locked in the direction from the proximal end to the distal end, and the relative positions of the handle 31 and the locking wire 11 and adjusting wire 12 are locked in the direction from the distal end to the proximal end, thus forming an integral structure with the thread cutter 300 and the locking wire 11 and adjusting wire 12. This integral structure moves synchronously with the heart under the action of cardiac force. During the synchronized movement of the entire structure following the heart's movement, the relative movement between the suture cutter 300 and the locking thread 11 and adjusting thread 12 is small or nonexistent. This helps avoid a large relative movement between the suture cutter 300 and the locking thread 11 and adjusting thread 12, which would cause the cutter 35 to be far from the knot 13 when cutting the locking thread 11 and adjusting thread 12. This, in turn, helps to reduce the distance between the cut and the knot 13, thus minimizing the length of the portion of the locking thread 11 and adjusting thread 12 remaining in the patient's body (i.e., the portion from the cut of the locking thread 11 and adjusting thread 12 to the knot 13). The shorter the length of the portion of the locking thread 11 and adjusting thread 12 remaining in the patient's body, the lower the risk of thrombosis in that portion.

[0054] Please see Figure 7In one embodiment, the connecting member 33 is provided with multiple wiring channels 332. The multiple wiring channels 332 are evenly distributed circumferentially. The wiring channels 332 are used for slidably threading the locking wire 11 and the adjusting wire 12. Each wiring channel 332 includes an inlet 3321 through which the locking wire 11 and the adjusting wire 12 can slide in, and an outlet 3322 through which the locking wire 11 and the adjusting wire 12 can slide out. The outlet 3322 is located distal to the distal end 321 of the tube body 32. During the threading of the locking wire 11 and the adjusting wire 12 through the connecting member 33, the proximal ends of the locking wire 11 and the adjusting wire 12 first enter through the inlet 3321 and then exit through the outlet 3322. Those skilled in the art will understand that in other embodiments, the multiple wiring channels 332 may also be non-uniformly distributed circumferentially. Those skilled in the art will also understand that the number of wiring channels 332 can be at least one, as long as it allows for the slidable threading of the locking wire 11 and the adjusting wire 12.

[0055] Please continue reading. Figure 7 In this embodiment, the outlet 3322 of the wiring channel 332 is located on the far side of the distal end 321 of the tube body 32, so that the locking wire 11 and the adjusting wire 12 passing through the connecting member 33 can extend to the outside of the connecting member 33 and the tube body 32 after passing through the outlet 3322. When the cutter 35 is subjected to driving force, such as Figure 8 As shown, when sliding past the outside of the outlet 3322, the cutter 35 is able to cut the portions of the locking line 11 and the adjusting line 12 located at the outlet 3322.

[0056] Since the locking wire 11 and the adjusting wire 12 are made of biodegradable materials, they are quite flexible, which makes it difficult for them to be pushed through the wire routing channel 332. Therefore, the shorter the length of the wire routing channel 332, the easier it is to reduce the difficulty of threading the locking wire 11 and the adjusting wire 12 through the wire cutter 300.

[0057] In this embodiment, the length of the connecting member 33 does not exceed 1 / 20 of the length of the tube body. The inlet 3321 and outlet 3322 of the wiring channel 332 are both located on the connecting member 33. The outlet 3322 is located on the far side of the far end 321 of the tube body 32, which makes the axial length of the portion of the locking wire 11 and the adjusting wire 12 passing through the wire cutter 300 shorter, which helps to reduce the difficulty of passing the locking wire 11 and the adjusting wire 12 through the wire cutter 300.

[0058] Please return Figure 7In one embodiment, the cutter 35 is annular in shape. The cutter 35 is slidably fitted onto the connecting member 33. When the cutter 35 is not subjected to external force, the cutting edge 351 of the cutter 35 is located on the far side of the outlet 3322 and has an axial distance from the outlet 3322. This ensures that the cutting edge 351 has an axial distance from the portions of the locking line 11 and the adjusting line 12 located at the outlet 3322, which helps to prevent the cutting edge 351 from cutting the portions of the locking line 11 and the adjusting line 12 located at the outlet 3322 before the connecting member 33 abuts against the knot 13.

[0059] Please continue reading. Figure 7 In one embodiment, the blade 351 faces the proximal end. During the process of the connecting member 33 sliding towards the knot 13 on the locking and adjusting line 12 (i.e., sliding towards the distal end), it is beneficial to avoid the blade 351 scraping against the inner wall of the delivery sheath 200, which would cause the material of the inner wall of the delivery sheath 200 to fall off and enter the blood circulation, causing embolism.

[0060] Please refer to the following: Figure 7 and Figure 8 After the relative positions of the wire cutter 300, the locking wire 11, and the adjusting wire 12 are locked, the blade 35 slides on the connecting member 33 under the action of the driving force. When the blade 351 passes through the outlet 3322, it cuts the portion of the locking wire 11 and the adjusting wire 12 at the outlet 3322.

[0061] In one embodiment, the cutter 35 is a closed ring. In other embodiments, the cutter 35 may also be an open ring, as long as the cutter 35 is slidably fitted onto the connecting member 33 and can cut the locking line 11 and the adjusting line 12 under the action of driving force.

[0062] Please see Figure 8 In one embodiment, the diameter of the blade 351 is smaller than the outer diameter of the distal end 321 of the tube body 32, and the diameter of the blade 351 is larger than the inner diameter of the distal end 321 of the tube body 32. During the process of the cutter 35 cutting the locking line 11 and the adjusting line 12, the blade 351 of the cutter 35 can abut against the distal end 321 of the tube body 32. This arrangement prevents the locking line 11 and the adjusting line 12 from moving synchronously with the blade 35 during the process of the cutter 35 cutting the locking line 11 and the adjusting line 12, thereby increasing the probability that the cutter 35 can cut the locking line 11 and the adjusting line 12 in a single cut, which helps to save surgical time.

[0063] Because the wire diameters of the locking wire 11 and the adjusting wire 12 are small, excessive wear may cause the locking wire 11 and the adjusting wire 12 to break.

[0064] Please see Figure 9In one embodiment, the inlet 3321 is located at the distal end 331 of the connecting member 33, such that the inlet 3321 is located far from the outlet 3322 (i.e., the outlet 3322 is located near the inlet 3321). Furthermore, the angle t between the longitudinal central axis 3323 of the wiring channel 332 and the longitudinal central axis 333 of the connecting member 33 does not exceed 45°.

[0065] This configuration ensures that the locking wire 11 and the adjusting wire 12 are as follows: Figure 7 When the locking wire 11 and adjusting wire 12 are threaded onto the connecting member 33 (i.e., after entering through the inlet 3321 and exiting through the outlet 3322), the angle formed by the locking wire 11 and adjusting wire 12 at the inlet 3321 is relatively large. The larger the angle formed by the locking wire 11 and adjusting wire 12 at the inlet 3321, the less friction the connecting member 33 experiences against the locking wire 11 and connecting wire at the inlet 3321 during the sliding process of the connecting member 33 on the locking wire 11 and adjusting wire 12. This is more conducive to reducing the risk of the connecting member 33 breaking the locking wire and adjusting wire 12, and further helps to avoid the connecting member 33 breaking the locking wire 11 and adjusting wire 12 at a position far from the knot 13, thus helping to avoid the locking wire 11 and adjusting wire 12 remaining in the body for too long.

[0066] With a fixed axial distance between inlet 3321 and outlet 3322, a smaller radial distance between inlet 3321 and outlet 3322 is more conducive to reducing [the impact of the current situation]. Figure 9 The angle t formed by the longitudinal center axis 3323 of the wiring channel 332 and the longitudinal center axis 333 of the connecting member 33 is smaller. The smaller the angle t, the larger the turning angle formed at the outlet 3322 when the locking wire 11 and the adjusting wire 12 are passed on the connecting member 33. Thus, it is more conducive to avoiding the connecting member 33 from breaking the locking wire 11 and the adjusting wire 12 during the sliding process of the connecting member 33 on the locking wire 11 and the adjusting wire 12.

[0067] Please continue reading. Figure 9 The inlet 3321 and outlet 3322 are located on the same side of the longitudinal central axis 333 of the connecting member 33, which helps to reduce the radial distance between the inlet 3321 and outlet 3322. Thus, during the process of the connecting member 33 sliding on the locking line 11 and the adjusting line 12, it helps to prevent the connecting member 33 from breaking the locking line 11 and the adjusting line 12.

[0068] Please see Figure 10 In one embodiment, the handle 31 includes a fixed handle 311 and a movable handle 312, the movable handle 312 being slidably disposed on the fixed handle 311.

[0069] Please see Figure 11The fixed handle 311 includes a guide rod 3111, which extends axially. See also... Figure 10 The guide rod 3111 is connected to the proximal end of the tube body 32. The guide rod 3111 has an axially extending guide groove 3112. The guide groove 3112 penetrates the radially opposite sidewalls of the guide rod 3111. The distal end of the guide rod 3111 has an axially extending through hole 3113, which communicates with the guide groove 3112, allowing the guide groove 3112 to communicate with the cavity of the tube body 32.

[0070] In one embodiment, the fixed handle 311 further includes a first finger ring 3114, which is connected to the proximal end of the guide rod 3111. The first finger ring 3114 allows the operator to insert their finger (thumb), facilitating the operator to apply force to the guide rod 3111 so that the guide rod 3111 and the movable handle 312 can generate relative movement.

[0071] In one embodiment, the maximum width of the first ring 3114 is greater than the maximum width of the guide rod 3111. When the movable handle 312 slides to the proximal end of the guide rod 3111 under the action of an external force, the first ring 3114 can limit the movable handle 312 to prevent the movable handle 312 from falling off the guide rod 3111.

[0072] Those skilled in the art will understand that in other embodiments, the first ring 3114 may be omitted. When the first ring 3114 is omitted, the operator can directly press the proximal end of the guide rod 3111 with their finger (e.g., thumb) when operating the guide rod 3111.

[0073] Please return Figure 10 In one embodiment, the movable handle 312 includes a sleeve 3121, which is slidably fitted onto the... Figure 11 The guide rod 3111 is shown in the figure. The sleeve 3121 is connected to the transmission assembly 37 (see transmission assembly 37). Figure 12 (This will be described in detail below) is driven to connect with the cutter 36. When the sleeve 3121 is subjected to an external force and slides on the guide rod 3111 near the end, the sleeve 3121 applies a driving force to the cutter 35 through the transmission assembly 37, driving the cutter 35 to slide on the connecting member 33 towards the near end, thereby cutting the locking line 11 and the adjusting line 12.

[0074] exist Figure 10 In the illustrated embodiment, the movable handle 312 further includes two second finger rings 3122. The two second finger rings 3122 are connected to the sleeve 3121 and are symmetrically distributed radially on both sides of the sleeve 3121. In this embodiment, by providing two second finger rings 3122 connected to the sleeve 3121, the operator can easily apply force to the sleeve 3121, thereby facilitating relative movement of the sleeve 3121 relative to the guide rod 3111.

[0075] Understandably, in other embodiments, the two second finger rings 3122 may be omitted. After omitting the second finger rings 3122, the operator can also apply force to the sleeve 3121 by pinching the two sides of the sleeve 3121 with his / her fingers, so that the sleeve 3121 moves relative to the guide rod 3111.

[0076] Please see Figure 12 In one embodiment, the wire cutter 300 further includes a transmission assembly 37 for drivingly connecting the movable handle 312 to the cutter 35.

[0077] Please continue reading. Figure 12 The transmission assembly 37 includes a sliding block 371 and a traction line 372. The sliding block is slidably disposed within the guide groove 3112 of the guide rod 3111, and the sliding block 371 is connected to the sleeve 3121. When the sleeve 3121 slides on the guide rod 3111, it can drive the sliding block to slide within the guide groove 3112. The proximal end of the traction line 372 is connected to the sliding block 371. The distal end of the traction line 372 extends axially to the distal end and extends through the through hole 3113 into the cavity of the tube body 32.

[0078] Please refer to the following: Figure 12 and Figure 13 In one embodiment, the traction line 372 is formed by folding a linear structure in half to create a closed loop at the distal end. In other embodiments, the traction line 372 may also form a closed loop at its distal end by welding the distal ends of the two branches together or by other connection methods. Of course, in another embodiment, a closed loop may not be formed at the distal end of the traction line 372, provided that the distal end of the traction line 372 is connected to the pull member 373 described in detail below (see [link to details]). Figure 14 Alternatively, the distal end of the traction line 372 can be directly connected to the tool 35, so that the traction line 372 can transmit the driving force applied by the movable handle 312 to the tool 35.

[0079] Please see Figure 13 and Figure 14 In one embodiment, the transmission assembly 37 further includes two pulling members 373. The proximal ends of the two pulling members 373 are located in the cavity of the tube body 32 and are connected to the distal end of the traction line 372, thereby driving the two pulling members 373 to the movable handle 312. The distal ends of the two pulling members 373 extend axially to the outside of the tube body 32 and are connected to the cutter 35. When the movable handle 312 is subjected to an external force and moves proximal relative to the fixed handle 311, the cutter 35 is pulled proximal by the traction line 372 and the pulling members 373 and moves proximal on the connecting member 33, thereby cutting the locking line 11 and the adjusting line 12.

[0080] The proximal ends of the two tension members 373 are connected, forming a continuous structure at the proximal end, and they are separated from each other at the distal end. When installing the two tension members 373 with the traction line 372, the distal ends of the two tension members 373 are inserted into the closed loop at the distal end of the traction line 372, so that the proximal ends of the tension members 373 and the distal ends of the traction line 372 are hooked together, which can save installation time.

[0081] In other embodiments, the transmission assembly 37 may also include only one traction member 373, as long as the two ends of the traction member are connected to the cutter 35 and the traction line 372 respectively, and can transmit a driving force pointing towards the proximal end to the cutter 35, so that the cutter 35 moves towards the proximal end to cut the locking line 11 and the adjusting line 12.

[0082] During the process of the connecting member 33 sliding distally on the locking line 11 and the adjusting line 12, the cutter 35 may collide (or rub) with the inner wall of the delivery sheath 200 (or the inner wall of the blood vessel), which may cause it to slide proximally on the connecting member 33 due to the external force directed towards the proximal end. This may result in the cutter 35 prematurely cutting the locking line 11 and the adjusting line 12 at the outlet 3322 before the connecting member 33 abuts against the knot 13, leaving an excessively long portion of the locking line 11 and the adjusting line 12 remaining in the patient's body.

[0083] To reduce the risk that the cutting tool 35 will cut the locking wire 11 and the adjusting wire 12 before the connecting member 33 comes into contact with the wire knot 13. Figure 14 The wire cutter 300 of the illustrated embodiment also includes an elastic member 36, which is connected to the cutter 35 and the tube 32 respectively. The elastic member 36 can generate a spring force acting on the cutter 35 in a direction from the proximal end to the distal end. During the sliding of the connecting member 33 on the locking wire 11 and the adjusting wire 12 towards the distal end, when the cutter 35 slides towards the proximal end (i.e., towards the outlet 3322) or has a tendency to slide towards the proximal end, the elastic member 36 can generate a spring force acting on the cutter 35, which can prevent the cutter 35 from sliding towards the proximal outlet 3322 to cut the locking wire 11 and the adjusting wire 12, thereby reducing the risk that the cutter 35 will prematurely cut the locking wire 11 and the adjusting wire 12 before the connecting member 33 abuts against the knot 13. However, when the cutter 35 is subjected to a driving force, it can overcome the spring force of the elastic member 36, thereby cutting the locking wire 11 and the adjusting wire 12.

[0084] Please continue reading. Figure 14 In one embodiment, the distal ends of the two tension members 373 extend from the radial gap between the cutter 35 and the connecting member 33 to be connected to the cutter 35. Elastic members 36 are provided in a one-to-one correspondence with the tension members 373. Figure 14In the embodiment shown, the elastic member 36 is a helical spring, which is sleeved on the corresponding tension member 373. The two ends of the helical spring are connected to the blade 351 of the cutter 35 and the tube 32, respectively, thereby reducing the risk of the cutter 35 cutting the locking line 11 and the adjusting line 12 before the connecting member 33 comes into contact with the knot 13.

[0085] Furthermore, the helical spring abuts against the cutting edge 351 of the blade 35, causing the helical spring to overlap with the cutting edge 351 of the blade 35 in the axial direction. This arrangement eliminates the need to increase the radial clearance between the blade 35 and the connecting member 33 to accommodate the helical spring, thus reducing the radial dimension of the blade 35 and facilitating its delivery within the patient's body.

[0086] Please refer to the following: Figure 15 and Figure 16 In one embodiment, the cable adjustment mechanism 34 includes a fixed member 341 and a movable member 342. The fixed member 341 is disposed on the handle 31 and fixed to the movable handle 312. In other embodiments, the fixed member 341 may also be fixed to the fixed handle 311. In the embodiment where the fixed member 341 is fixed to the fixed handle 311, the sleeve 3121 is provided with a clearance groove to avoid interference between the sleeve 3121 and the movable member 342 when the movable handle 312 moves relative to the fixed handle 311.

[0087] Please continue reading. Figure 15 and Figure 16 In one embodiment, the fixing member 341 includes a plurality of one-way teeth 3411. The plurality of one-way teeth 3411 are arranged in a ring and fixedly disposed on the movable handle 312.

[0088] The movable component 342 includes a winding drum 3421 and a plurality of mating teeth 3422 connected to the winding drum 3421. The winding drum 3421 is detachably connected to the locking wire 11 and the adjusting wire 12. In one embodiment, the plurality of mating teeth 3422 are located at one end of the winding drum 3421. The plurality of mating teeth 3422 can engage with a plurality of one-way teeth 3411. When the plurality of mating teeth 3422 engage with the plurality of one-way teeth 3411, and the winding drum 3421 is subjected to a torque in a first direction, the plurality of mating teeth 3422 can move along the plurality of one-way teeth 3411, and the plurality of mating teeth 3422 are limited by the plurality of one-way teeth 3411 in a second direction opposite to the first direction.

[0089] With this configuration, during the use of the wire cutter 300, when the winding drum 3421 is connected to the locking wire 11 and the adjusting wire 12 that pass through the outlet 3322, the movable member 342 rotates relative to the fixed member 341 in the first direction under the torque in the first direction, thereby winding the locking wire 11 and the adjusting wire 12, thereby tensioning the locking wire 11 and the adjusting wire 12. After the locking thread 11 and adjusting thread 12 are tensioned and the torque in the first direction is released, the movable member 342 is limited by the fixed member 341 in the second direction, keeping the locking thread 11 and adjusting thread in a tensioned state and locking the relative position of the handle 31 with the tensioned locking thread 11 and adjusting thread 12. When the distal end 331 of the connecting member 33 abuts against the knot 13, the thread cutter 300 can form an integral structure with the locking thread 11 and adjusting thread 12. This helps to avoid the large amplitude of relative movement between the thread cutter 300 and the locking thread 11 and adjusting thread 12, which would cause the blade 35 to be far away from the knot 13 when cutting the locking thread 11 and adjusting thread 12. This helps to reduce the length of the locking thread 11 and adjusting thread 12 left in the patient's body.

[0090] Please refer to the following: Figure 16 and Figure 17 In one embodiment, each unidirectional tooth 3411 includes a bottom surface 3412 and a top surface 3413, with the bottom surface 3412 located between the surface of the handle 31 and the top surface 3413. The thickness between the bottom surface 3412 and the top surface 3413 gradually increases from zero along a first direction, and after the thickness reaches its maximum value, the thickness remains constant along the first direction. In other embodiments, the thickness between the bottom surface 3412 and the top surface 3413 gradually increases from zero along the first direction.

[0091] When multiple mating teeth 3422 engage with multiple one-way teeth 3411, each mating tooth 3422 is located between two adjacent one-way teeth 3411. The shape of each mating tooth 3422 matches the shape of the gap between its two adjacent one-way teeth 3411. When multiple mating teeth 3422 engage with multiple one-way teeth 3411, each mating tooth 3422 contacts the thicker end of one adjacent one-way tooth 3411 and the top surface 3413 of another adjacent one-way tooth 3411, such that when the mating tooth 3422 is subjected to a torsional force in the first direction, the mating tooth 3422 can slide along the top surface 3413 of the one-way tooth 3411. In the second direction, due to the contact between the mating tooth 3422 and the thicker end of the one-way tooth 3411, interference occurs, thereby limiting the mating tooth 3422 in the second direction.

[0092] This configuration allows the winding drum 3421 to wind the locking wire 11 and the adjusting wire 12 under torque in the first direction, thereby tensioning the locking wire 11 and the adjusting wire 12. Furthermore, after the locking wire 11 and the adjusting wire 12 are tensioned, the torque in the first direction is released, causing the winding drum 3421 to be limited in the second direction, thus locking the relative position of the handle 31 with respect to the locking wire 11 and the adjusting wire 12 in a direction from the proximal end to the distal end.

[0093] In other embodiments, the shape of each mating tooth 3422 may not match the shape of the gap between the two adjacent one-way teeth 3411. As long as when the multiple mating teeth 3422 mesh with the multiple one-way teeth 3411, at least one mating tooth 3422 contacts the thicker end of one of the adjacent one-way teeth 3411 and the top surface 3413 of another adjacent one-way tooth 3411, the mating tooth 3422 can slide along the top surface 3413 of the one-way tooth 3411 when the mating tooth 3422 is subjected to a torque in the first direction, but in the second direction, the mating tooth 3422 is limited by interference from the thicker end of the adjacent one-way tooth 3411.

[0094] Please return Figure 15 and Figure 16 In one embodiment, the fixing member 341 further includes a connecting post 3414, which is surrounded by a plurality of one-way teeth 3411 and is fixedly connected to the handle 31. A winding spool 3421 is rotatably sleeved on the connecting post 3414, and a plurality of mating teeth 3422 on the winding spool 3421 engage with a plurality of one-way teeth 3411 on the outer side of the connecting post 3414.

[0095] Please continue reading. Figure 15 and Figure 16 In one embodiment, the wire adjusting mechanism 34 further includes an elastic element 343, one end of which is connected to the winding drum 3421, and the other end is connected to the movable handle 312 via a connecting post 3414. In other embodiments, the elastic element 343 may also be directly connected to the movable handle 312. In this embodiment, the end of the elastic element 343 connected to the movable handle 312 is surrounded by a plurality of one-way teeth 3411 and avoids contact with the plurality of one-way teeth 3411.

[0096] exist Figure 15 and Figure 16 In the commonly illustrated embodiment, the winding drum 3421 is rotatably connected to the elastic member 343, thereby preventing the elastic member 343 from interfering with the rotation of the winding drum 3421 in the first direction on the movable handle 312. In other embodiments, the connecting post 3414 may be rotatably connected to the elastic member 343, or both the winding drum 3421 and the connecting post 3414 may be rotatably connected to the elastic member 343.

[0097] The mating teeth 3422 and the one-way teeth 3411 remain engaged under the elastic force of the elastic member 343. This arrangement allows the movable member 342 to wind around the connected locking wire 11 and adjusting wire 12 under the torque applied in the first direction by the operator, so that the locking wire 11 and adjusting wire 12 are tensioned. After the torque in the first direction is removed, the multiple mating teeth 3422 are limited in the second direction, thereby locking the relative position of the handle 31 with the proximal ends of the locking wire 11 and adjusting wire 12.

[0098] Please continue reading. Figure 15 and Figure 16 In one embodiment, the winding drum 3421 is provided with at least one wire groove 3423 for receiving the wire wound on the winding drum 3421. The opening of each wire groove 3423 is arranged radially outward along the winding drum 3421. In the radially inward direction of the winding drum 3421, the width of the wire groove 3423 gradually decreases, so that the wire groove 3423 can be detachably connected to the locking wire 11 and the adjusting wire 12 by snap-fit.

[0099] In another embodiment, the movable handle 312 or the fixed handle 311 is provided with a plurality of insertion holes (not shown), which are arranged axially. The cable adjustment mechanism 34 includes a movable member 342, but does not include the aforementioned fixed member 341. The movable member 342 is a winding spool 3421 that can be inserted into any one of the plurality of insertion holes. During use, after the movable member 342 is detachably connected to the locking wire 11 and the adjusting wire 12 passing through the outlet 3322 (e.g., the locking wire 11 and the adjusting wire 12 are wound on the movable member 342), the movable member 342 is inserted into one of the plurality of insertion holes to keep the locking wire 11 and the adjusting wire 12 taut and to lock the relative position of the handle and the locking wire 11 and the adjusting wire 12 in the direction from the distal end to the proximal end.

[0100] In other embodiments, the movable component 342 of the adjusting mechanism 34 is a sliding mount, which is slidably mounted on the movable handle 312 or the fixed handle 311 and can be detachably connected to the locking wire 11 and the adjusting wire 12 passing through the outlet 3322. The fixing component 341 of the adjusting mechanism 34 is a bolt. The bolt is threaded onto the movable handle 312 or the fixed handle 311. The bolt and the sliding mount have the same bearing structure, which is the movable handle 312 or the fixed handle 311. Under torque, the bolt can rotate on its bearing structure, thereby pressing against the sliding mount or separating from the sliding mount. When the bolt is separated from the sliding mount, after the sliding mount is connected to the locking wire 11 and the adjusting wire 12 passing through the outlet 3322, the sliding mount can pull the locking wire 11 and the adjusting wire 12 under external force, thereby tensioning the locking wire 11 and the adjusting wire 12. After the locking line 11 and the adjusting line 12 are pulled to tension by the sliding mount, the bolt is tightened and the screw is pressed against the sliding mount, so that the sliding mount is fixed to its load-bearing structure, and the relative position of the handle 31 with the locking line 11 and the adjusting line 12 can be locked in the direction from the distal end to the proximal end.

[0101] Please see Figure 18 In one embodiment, the wire cutter 300 further includes a threading assembly 38, which includes a threading member 381 and a sliding member 382.

[0102] The threading member 381 is rigid, but can deform under external force. That is, the threading member 381 has both rigidity and flexibility. In this embodiment, the rigidity of the threading member 381 is greater than that of the locking wire 11 and the adjusting wire 12, so that the pushing performance of the threading member 381 in the wiring channel 332 is better than that of the locking wire 11 and the adjusting wire 12.

[0103] The sliding member 382 includes a cylindrical structure and is connected to the threading member 381. The sliding member 382 is slidably disposed on the tube body. Under the action of an external force, the sliding member 382 can slide between a first position and a second position, thereby driving the threading member 381. The first position is located distal to the second position. When the sliding member 382 is located at... Figure 18 In the first position shown, the distal end of the threading member 381 can be inserted through the outlet 3322 and then exited through the inlet 3321 under the action of external force, and the part of the threading member 381 that exits through the inlet 3321 can be detachably connected to the locking wire 11 and the adjusting wire 12. When the threading member 381 is connected to the locking wire 11 and the adjusting wire 12, during the process of the sliding member 382 sliding from the first position to the second position under the action of external force, the distal end of the threading member 381 enters the wiring channel 332 from the inlet 3321 and then exits through the outlet 3322, thereby enabling the locking wire 11 and the adjusting wire 12 to be slidably threaded on the connecting member 33.

[0104] Compared to the method of threading the locking wire 11 and adjusting wire 2 without the aid of the threading assembly 38 of this embodiment, in this embodiment, the threading member 381 of the threading assembly 38 is first threaded onto the connecting member 33, and then the portion of the threading member 381 that passes through the inlet 3321 is detachably connected to the locking wire 11 and adjusting wire. The threading member 381 is then driven to move, thereby driving the locking wire 11 and adjusting wire 12 to be threaded onto the connecting member 33. Since the pushing performance of the threading member 381 within the suture channel 332 is better than that within the suture channel 332, the efficiency of the threading member 381 in threading onto the connecting member 33 is higher. Therefore, the threading assembly 38 of this embodiment can improve the efficiency of threading the locking wire 11 and adjusting wire 12 onto the connecting member 33, thereby saving surgical time. Furthermore, before the suture cutter 300 leaves the factory, the threading member 381 can be threaded onto the connecting member 33, which can further save surgical time.

[0105] In one embodiment, the threading member 381 includes two branches 3811 arranged side by side, the distal ends of the two branches 3811 being connected, and the proximal ends of the two branches 3811 being connected to the slider 382. The threading member 381 includes a first interval segment S1, a second interval segment S2, and a third interval segment S3 connected sequentially from distal to proximal. When the slider 382 is located at... Figure 18 In the first position shown, the distal end of the threading member 381 exits through the inlet 3321. Both the first segment S1 and the second segment S2 are located distal to the inlet 3321. The proximal end of the second segment S2 is spaced from the distal end 331 of the connecting member 33, and the maximum gap within the second segment S2 is greater than or equal to twice the diameter of the suture. When the suture consists of multiple threads or strands, the maximum gap within the second segment S2 is greater than or equal to twice the sum of the diameters of the multiple threads or strands. This arrangement facilitates the operator in threading the suture onto the threading member 381, saving surgical time.

[0106] Please continue reading. Figure 18 In one embodiment, the maximum width within the second segment S2 is greater than the maximum width within the first segment S1, and the maximum width within the second segment S2 is greater than the maximum width within the third segment S3. This ensures that during the insertion of the guide member 381 into the wiring channel 332, the narrower first segment S1 enters the wiring channel 332 first, reducing the resistance to the guide member 381 entering the wiring channel 332, and the first segment S1 acts as a guide. Similarly, during the exit of the guide member 381 from the wiring channel 332, the narrower third segment S3 exits the wiring channel 332 first, reducing the resistance to the guide member 381 exiting the wiring channel 332.

[0107] In one embodiment, the threading member 381 is elastic. After the second section S2 passes through the inlet 3321, the portions of the two branches 3811 within the second section S2 are separated from each other, so that the operator can thread the locking wire 11 and the adjusting wire 12 onto the threading member 381.

[0108] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0109] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A wire cutter for cutting wire, characterized in that, include: handle; A tube body, the proximal end of which is connected to the handle; A connecting member is connected to the distal end of the tube body. The connecting member can be slidably passed through the line body and can slide on the line body under the action of thrust. A cable adjusting mechanism is detachably connected to the cable extending from the connecting member. The cable adjusting mechanism is movably mounted on the handle. When the cable adjusting mechanism is connected to the cable, it can move relative to the handle under the action of an external force to tension the cable. After the cable adjusting mechanism has tensioned the cable and the external force has been removed, the cable adjusting mechanism is limited on the handle and remains stationary relative to the handle, so that the relative position of the handle and the cable is locked in the direction from the distal end to the proximal end. A cutting tool is slidably disposed on the connecting member. Under the action of a driving force, the cutting tool can slide on the connecting member to cut the wire passing through the connecting member.

2. The wire cutter as described in claim 1, characterized in that, The cable adjustment mechanism includes a fixed component and a movable component. The fixed component is disposed on the handle and includes multiple one-way teeth. The multiple one-way teeth are fixedly disposed on the handle and arranged in a ring. The movable component includes a winding spool and multiple mating teeth connected to the winding spool. The winding spool can be detachably connected to the cable. The multiple mating teeth can engage with the multiple one-way teeth. When the multiple mating teeth engage with the multiple one-way teeth, and the winding spool is subjected to a torsional force in a first direction, the multiple mating teeth can move along the multiple one-way teeth. The winding spool rotates in the first direction and winds the cable connected to it, thereby tensioning the cable. The mating teeth are limited by the multiple one-way teeth in a second direction opposite to the first direction, so that the relative position of the handle and the tensioned cable is locked in the direction from the distal end to the proximal end.

3. The wire cutter as described in claim 2, characterized in that, Each of the unidirectional teeth includes a bottom surface and a top surface. The bottom surface is located between the surface of the handle and the top surface. The thickness between the bottom surface and the top surface gradually increases from zero along the first direction. When the plurality of mating teeth engage with the plurality of unidirectional teeth, each mating tooth is located between two adjacent unidirectional teeth. At least one mating tooth contacts the thicker end of one of its adjacent unidirectional teeth and the top surface of another adjacent unidirectional tooth. When the mating tooth is subjected to a torque in the first direction, the mating tooth can slide along the top surface. When the torque in the first direction is removed, the mating tooth is held by the thicker end of the adjacent unidirectional tooth, thereby being limited in the second direction.

4. The wire cutter as described in claim 2 or 3, characterized in that, The wire adjusting mechanism also includes an elastic element, which is connected to the winding drum and the handle respectively, and the elastic element is rotatably connected to the winding drum and / or the handle. The mating teeth and the one-way teeth are engaged under the elastic force of the elastic element.

5. The wire cutter as described in any one of claims 2 or 3, characterized in that, The winding drum is provided with at least one groove, which can accommodate the wire wound on the winding drum. The opening of each groove is arranged radially outward along the winding drum. The width of the groove gradually decreases in the radially inward direction of the winding drum so that the groove can engage with the wire.

6. The wire cutter as described in claim 1, characterized in that, The connecting member is provided with a wiring channel, which includes an inlet through which the wire can be slidably inserted and an outlet through which the wire can be slidably exited. The outlet is located on the far side of the distal end of the tube.

7. The wire cutter as described in claim 6, characterized in that, The inlet is located at the far end of the connecting member, the outlet is located near the inlet, and the angle between the longitudinal central axis of the wiring channel and the longitudinal central axis of the connecting member does not exceed 45°.

8. The wire cutter as described in claim 6, characterized in that, The inlet and the outlet are located on the same side of the longitudinal central axis of the connecting member structure.

9. The wire cutter as described in claim 6, characterized in that, The thread cutter further includes a threading assembly, which includes: The threading member is rigid but can deform under external force, and the rigidity of the threading member is greater than that of the wire. A sliding member is connected to the threading member. The sliding member is slidably disposed on the tube body and can drive the threading member to slide between a first position and a second position under the action of an external force, thereby driving the threading member to move. The first position is located far from the second position. When the sliding member is in the first position, the distal end of the threading member can pass through the outlet and then out through the inlet under the action of an external force. The part of the threading member that passes through the inlet can be detachably connected to the wire. When the threading member is connected to the wire, during the process of the sliding member sliding from the first position to the second position under the action of an external force, the distal end of the threading member returns from the inlet to the wiring channel and then passes through the outlet, thereby driving the wire to be slidably threaded on the connecting member.

10. The wire cutter as claimed in claim 9, characterized in that, The threading member includes two branches arranged side by side, the distal ends of the two branches are connected, and the proximal ends of the two branches are connected to the sliding member. The threading member includes a first section, a second section, and a third section connected sequentially from far to near. When the distal end of the threading member passes through the inlet, both the first section and the second section are located far from the inlet, and the proximal end of the second section is spaced from the distal end of the connecting member. The maximum gap within the second section is greater than or equal to twice the diameter of the wire.

11. The wire cutter as claimed in claim 10, characterized in that, The maximum width within the second interval is greater than the maximum width within the first interval, and the maximum width within the second interval is greater than the maximum width within the third interval.

12. The wire cutter as claimed in claim 6, characterized in that, When the cutter is not subjected to external force, the cutting edge of the cutter is located on the far side of the outlet and facing the near end. There is an axial distance between the cutting edge and the outlet. The wire cutter also includes an elastic member, which is connected to the cutter and the tube body respectively. The elastic member can generate a spring force acting on the cutter in the direction from the near end to the far end.

13. The wire cutter as claimed in claim 12, characterized in that, The cutter is ring-shaped and slidably mounted on the connecting member. The wire cutter also includes a transmission assembly, which includes a pulling member for transmitting the driving force to the cutter. The proximal end of the pulling member is connected to the handle, and the distal end of the pulling member extends into the radial gap between the cutter and the connecting member and is connected to the cutter. The elastic member is a helical spring, which is mounted on the pulling member. The two ends of the helical spring are respectively connected to the tube body and the cutting edge of the cutter.

14. The wire cutter as claimed in claim 6, characterized in that, When the cutting tool is not subjected to external force, the cutting edge of the cutting tool is located on the far side of the outlet and facing the near end. The diameter of the cutting edge is smaller than the outer diameter of the far end of the tube body, and the diameter of the cutting edge is larger than the inner diameter of the far end of the tube body. During the process of the cutting tool cutting the line, the cutting edge of the cutting tool can abut against the far end of the tube body.

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