CN114680967A

CN114680967A - Thread cutting device

Info

Publication number: CN114680967A
Application number: CN202011640703.2A
Authority: CN
Inventors: 吴能标; 高国庆; 王永胜
Original assignee: Hangzhou Dinova EP Technology Co Ltd
Current assignee: Hangzhou Dinova EP Technology Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2022-07-01
Also published as: WO2022143990A1

Abstract

The application discloses tangent line device includes: the handle is arranged at the proximal end of the thread cutting device; the sheath is arranged at the far end of the thread cutting device, the sheath is tubular, a window is formed in the side wall of the sheath, and a thread body is used for penetrating through the sheath from the window; a cutting member fixed in the sheath and including a distally facing cutting edge for cutting the wire body; and the sliding block is arranged in the sheath, a wire body in the sheath is connected with the sliding block, and the sliding block drives the wire body to slide towards the near end relative to the sheath under the control of the handle, so that the wire body is in contact with the cutting edge. The tangent line device that provides in this application can design the slider size according to actual need, on the basis of guaranteeing the operation security, can make tangent line back line tail reserve length shorter, is favorable to shortening line tail absorption time, reduces the foreign matter reaction that the indwelling line body leads to.

Description

Thread cutting device

Technical Field

The application relates to the technical field of medical equipment, in particular to a wire cutting device.

Background

After tying a knot to secure the wire in place during surgery, the excess wire needs to be cut. This can be done during open surgery or on the skin surface using scissors or similar tools. However, in minimally invasive surgery, most of the work is done through a small opening such as a cannula, and standard surgical scissors are too large to cut a wire through the opening.

Devices have been developed that have the ability to cut the wire body by means of a mechanism provided on the end of an elongate rod adapted to these narrow spaces. When trimming, these devices cause very easily to keep somewhere the knot tail overlength of line for the knot absorbs time long, keeps somewhere the line body foreign matter and leads to the foreign matter reaction easily.

Disclosure of Invention

The application provides a tangent line device includes:

the handle is arranged at the proximal end of the thread cutting device;

the sheath is arranged at the far end of the thread cutting device, the sheath is tubular, a window is formed in the side wall of the sheath, and a thread body is used for penetrating through the sheath from the window;

a cutting member fixed in the sheath and including a distally facing cutting edge for cutting the wire body; and

the sliding block is arranged in the sheath, a wire body in the sheath is connected with the sliding block, and the sliding block can drive the wire body to slide towards the near end relative to the sheath under the control of the handle, so that the wire body is in contact with the cutting edge.

In the operation process, when the line tail of the line body needs to be cut, the line cutting device provided by the application can be adopted, wherein the sliding block drives the line body at the line tail to slide towards the near end, so that the line body is in contact with the cutting blade to realize the line cutting function. The slider is used for driving the line body to make the line body contact cutting edge to the near-end motion, and the part that the slider is located the line body distal end (the part that is used for in the slider to the near-end pulling line body) can set up less at axial size for the length of tangent line back line tail is shorter. In practice, however, too short a tail may cause the knot to loosen and need to be re-tied; if the knot is loosened after the operation is finished, extremely serious operation complications can be caused, and the operation needs to be performed again. Consequently, the tangent line device that provides in this application can design the slider size according to actual need, on the basis of guaranteeing the operation security, can make tangent line back line tail reserve length shorter, is favorable to shortening line tail absorption time, reduces the foreign matter reaction that the indwelling line body leads to.

The application provides a cutting device can be used for the cutting of body surface line body to and the cutting of line body among the surgery operation. The cutting device adopts a cutting driving mode that the sliding block moves towards the near end, so that the cutting device is connected among the sheath at the far end, the sliding block and the handle at the near end by adopting a flexible device, and under the condition that the cutting device is connected among the sheath, the sliding block and the handle by adopting the flexible device, the flexible part can enter the body of a patient along a blood vessel through body surface puncture to reach a target position, namely, the body of the patient is cut by adopting an intervention mode, and the application range of the cutting device is favorably expanded.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a thread cutting device provided in the present application.

Fig. 2 is a cross-sectional view of the thread cutting apparatus shown in fig. 1 taken along line a-a.

Fig. 3 is an exploded view of the tangent device shown in fig. 1.

Fig. 4 is an enlarged view of a portion of the components in fig. 3.

Fig. 5 is another perspective view of the sleeve of fig. 3.

FIG. 6 is another structural diagram of the slider shown in FIG. 3.

Fig. 7 is a schematic structural view of the thread cutting assembly shown in fig. 1 after the thread body is threaded.

Figure 8 is a cross-sectional view of the distal portion of the thread cutting device of figure 1 in an uncut state after it has been threaded into a body of a thread.

Figure 9 is a partial cross-sectional view of the distal portion of the cutting device of figure 8 taken along line a-a after the cutting device has been threaded into a body.

Fig. 10 is a schematic structural view of the thread cutting device shown in fig. 1, in which a side housing of the housing is disassembled.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present application. It is apparent, however, to one skilled in the art that the present application may be practiced without these specific details or with an equivalent arrangement.

Where a range of values is disclosed herein, unless otherwise stated, the range is continuous and includes both the minimum and maximum values of the range and each value therebetween. Further still, where a range refers to integers, only integers from the minimum to and including the maximum of that range are included. Further, where multiple ranges are provided to describe a feature or characteristics, such ranges can be combined.

As used herein, the terms "distal" and "proximal" define a position or orientation relative to a clinician or clinician's handle (e.g., a handle assembly). "distal" or "distally" refers to a location away from the clinician or clinician's handle or in a direction away from the clinician or clinician. "proximal" or "proximally" refers to a location proximate to or in a direction toward the clinician's or clinician's handle.

In addition, the direction of the rotation center axis of an object such as a cylinder or a pipe is defined as an axial direction, and the direction perpendicular to the axial direction is defined as a radial direction. The definitions are for convenience only and do not limit the present application.

The present application provides a thread cutting device for cutting a thread body, which is an implantable thread body, such as a surgical suture in or on the body surface, a metal thread to which an implant is attached in vivo, or the like. For example, the line body is after internal or the body surface is tied a knot, when the line body of line knot line tail need cut off, perhaps be connected with the line body on the internal implant, the implant is after internal release is accomplished, need cut off the line body on the implant in order to break off the implant and conveyor between the time being connected, the tangent line device that can adopt this application to provide cuts the line body, after the tangent line is accomplished to the line body, it is shorter to reserve in internal line tail (the free end of the line body), be favorable to providing suitable line tail length, shorten line tail absorption time, reduce the foreign matter reaction that the line body leads to of keeping somewhere.

As shown in fig. 1-3, the thread cutting device 10 includes a cutting assembly 100 disposed at a distal end of the thread cutting device 10, and a handle 800 disposed at a proximal end of the thread cutting device 10. Wherein the cutting assembly 100 is configured to approximate and cut a wire body at a distal end, and the handle 500 is configured to be held by a clinician and to manipulate the cutting action of the cutting assembly 100.

Referring to fig. 4 to 7, the cutting assembly 100 includes a sheath 110, a cutting element 130 and a slider 150. The sheath 110 is tubular, the sheath 110 is open at the proximal end and the distal end, respectively, and a window 113 is formed on the side wall of the sheath 110, and the wire body 90 (fig. 8-9) is used for passing through the sheath 110 from the window 113; a cutting member 130, fixed in the sheath 110, comprising a distally directed cutting edge 132 for the cutting wire body 90; the sliding block 150 is disposed in the sheath 110, the wire body 90 in the sheath 110 is connected to the sliding block 150, and the sliding block 150 drives the wire body 90 to slide towards the proximal end relative to the sheath under the control of the handle 800, so that the wire body 90 contacts the cutting edge 132, thereby achieving a tangent effect.

The slider 150 is used for driving the wire body 90 to move towards the near end so that the wire body 90 contacts the cutting edge 132, the moving range of the slider 150 towards the near end can be set to be smaller, and after the wire body 90 is connected with the slider 150, the axial size of the part, located at the far end of the wire body 90, of the slider 150 can be set to be smaller, so that the length of the tail of the tangent line is shorter. In practice, however, too short a thread tail may cause the knot to loosen and need to be tied again; if the knot is loosened after the operation is finished, extremely serious operation complications can be caused, and the operation needs to be performed again. Consequently, the tangent line device 10 that provides in this application can design the slider size according to actual need, on the basis of guaranteeing the operation security, can make tangent line back line tail reserve length shorter, is favorable to shortening line tail absorption time, reduces the foreign matter reaction that the indwelling line body leads to.

The cutting member 130 includes a body 131 and a cutting edge 132 disposed on the body 131. Preferably, the cutting member 130 is a blade, and the material thereof may be a metal material with good biocompatibility, such as stainless steel. The cutting edge 132 faces distally for cutting the wire body moving from the distal end to the proximal end.

The sheath 110 has the cutting member 130 fixed therein, and the sheath 110 may be made of a metallic material having good biocompatibility, such as stainless steel. The cutting element 130 and the sheath 110 may be made of the same material, and in some embodiments, the cutting element 130 and the sheath 110 are made of different materials to increase the stiffness of the cutting element 130.

In order to facilitate the assembly of the device, the sheath 110 is formed by assembling two discrete components, specifically, the sheath 110 includes a wire conduit 111 disposed at the distal end and a tail pipe 117 disposed at the proximal end, and after the assembly is finished, the wire conduit 111 and the tail pipe 117 are sleeved with each other and can be welded or bonded to each other. It is understood that in a modified embodiment, the sheath 110 is a unitary structure.

The wire-passing tube 111 is tubular and is sleeved on the cutting element 130 and the periphery of the slider 150, an opening 112 is formed at the distal end of the wire-passing tube 111, and a window 113 is formed on the side wall of the wire-passing tube 111. In the present embodiment, the path of the wire body through the wire passing tube 111 is: the sliding block passes through the opening 112, is connected with the sliding block 150 and then passes through the window 113; or through the window 113 and out of the opening 112 after the slider 150 is attached. In a modified embodiment, the distal end of the sheath 110 is closed without forming an opening, and two windows are formed on the side wall of the sheath 110 through which the wire body is sequentially passed.

The cutting member 130 is fixed inside the bobbin 111, 2 fixing grooves 114 are formed on the inner wall of the bobbin 111, the cutting member 130 is in the shape of a sheet, and two sides of the body 131 are respectively accommodated in one fixing groove 114. In the present embodiment, the fixing groove 114 extends in the axial direction such that the cutting member 130 is disposed in the axial direction. In the modified embodiment, the fixing groove 114 having another structure may be provided according to the specific shape of the cutter 130, or the cutter 130 may be fixed in another manner. In a modified embodiment, the angle between the fixation groove 114 and the axis is greater than 0 degrees, i.e. the fixation groove 114 and the cutting member 130 are arranged obliquely in the sheath 110.

The tail pipe 117 is tubular and is sleeved at the near end of the wire passing pipe 111, other components are contained in the tail pipe 117, and the near end of the tail pipe 117 is provided with an opening.

Referring to fig. 4, 6-9, the sliding block 150 forms a channel 152, the wire 90 is used to pass through the opening 112, the channel 152 and the window 153, and two ends of the wire 90 are used to extend out of the sheath 110.

Specifically, the slider 150 includes a main body 151, a channel 152 is formed on the main body 151, and the channel 152 includes a first threading opening 153 and a second threading opening 154 formed on the main body 151. The first threading opening 153 is disposed corresponding to the opening 112, and the second threading opening 154 is disposed corresponding to the window 113, thereby reducing the resistance of the thread pulling.

As shown in fig. 8 to 9, the extending direction of the channel 152 is inclined relative to the axis of the cutting assembly 100, and the channel 152 forms two angles with the axis, wherein the smaller angle is preferably in the range of 20 ° to 70 °. The smaller the angle, the closer the channel 152 extends to the axis, the less resistance to pulling the wire body 90 proximally, and the longer the axial length of the channel, in this embodiment, because the cutting element 130 is axially disposed, the smaller the angle, the closer the wire body 90 extends in the channel 152 to the cutting edge 132, and the greater the difficulty of cutting; the larger the angle, the more perpendicular the channel 152 extends to the axis, the greater the pull resistance, the shorter the channel axial length, and the less difficult the cutting. In some embodiments, to reduce pull line resistance, the channels 152 are rounded, particularly at the corners.

In some embodiments, the distal end of the body 151 of the slider 150 is hook-shaped, the hook-shaped distal end forming the aforementioned channel 152, the hook-shaped distal end being used to pull the wire body 90 proximally.

As shown in fig. 8, in a state that the slider 150 is not slid proximally relative to the sheath 110, the wire cutting device 10 is not performing a cutting action, and a clinician can pass the wire body through the sheath 110 and the slider 150, hold the free end of the wire body 90 extending from the window 113, and cause the sheath 110 and the free end of the wire body 90 to perform a relative motion, such as pulling the free end of the wire body 90 proximally, or holding the free end, and push the cutting assembly 100 distally until the distal end of the sheath 110 reaches a target cutting position (such as body tissue or an implant). In a state where the slider 150 is not slid proximally with respect to the sheath 110, the proximal edge of the second threading opening 154 is located more distally than the proximal edge of the window 113, i.e., the main body 151 of the slider 150 on the proximal side of the second threading opening 154 can be seen from the window 113. The friction generated when the free end of the wire body 90 is pulled proximally by the clinician after passing out of the window 113 is mainly concentrated on the edge of the proximal end of the window 113 where the wire body 90 contacts.

In this embodiment, the proximal edge of the second threading opening 154 is closer to the distal end than the proximal edge of the window 113, thereby facilitating the adjustment of the extending direction of the distal wire 90 at the proximal edge of the window 113 to be more gentle, and closer to the direction of the axis, thereby the extending directions of the distal wire 90 and the proximal wire 90 at the proximal edge of the window 113 are close, reducing the bending angle of the wire 90 at the proximal edge of the window 113, facilitating the reduction of the friction force generated at the window 113 during the pulling process of the free end of the wire 90 to the proximal end, making the pulling wire smoother and more labor-saving, and shortening the operation time.

In the embodiment where the proximal edge of the second threading opening 154 is aligned in the radial direction with respect to the proximal edge of the window 113, after the wire 90 passes through the channel 152, the wire extends proximally after the proximal edge of the window 113 is bent, the bending angle of the wire 90 at the proximal edge of the window 113 is relatively large, the friction force of the wire is large, and the wire is difficult and time-consuming to pull.

In some embodiments, the proximal edge of the second threading opening 154, as well as the proximal edge of the window 113, are rounded to reduce the resistance to pulling.

As shown in fig. 8 and 9, the body 151 distal to the passage 152 is a provision 158, the provision 158 being adapted to pull the wire body proximally, radially through the plane of the cutting member 130. The length of the tangent tail is the distance from the opening 112 to the cutting edge 132 of the wire body 90, and the distance is related to the axial dimension of the channel 152 and the reserved portion 158 in the plane of the cutting member 130. The channel 152 is used for passing through the wire 90 to be cut, and the size of the channel along the axial direction can be designed to be small, so that the channel can accommodate the wire 90; the reserved part 158 is used for driving the wire body 90 to move towards the proximal end, and the axial size of the reserved part 158 can be designed to be small, namely the thickness of the reserved part 158 is small, so that the proximal pulling of the reserved part 158 is not influenced. Therefore, the utility model provides a tangent line device 10 can guarantee shorter line tail length, is favorable to shortening line tail absorption time, reduces the foreign matter reaction that the indwelling line body leads to.

As shown in fig. 4 and fig. 6 to 9, the first threading opening 153 is irregularly shaped, is formed on the distal end surface and the side wall of the main body 151, has a portion facing the distal end, and further includes a direction facing the radial direction outward, so that the area of the first threading opening 153 is large, which is beneficial for threading, and is beneficial for reducing the frictional resistance during the process that the wire body 90 moves towards the proximal end relative to the cutting assembly 100, especially when a large number of disposable cutting wire bodies 90 are required, the effect is more obvious.

The portion of the first threading opening 153 facing the distal end is disposed corresponding to a side of the opening 112 away from the window 113. That is, the portion of the opening 112 adjacent to the window 113 is blocked by the main body 151 of the slider 150, and the side of the opening 112 away from the window 113 is communicated with the first threading opening 153, so that the wire body 90 has a larger radial extension size in the channel 152, and extends from the second threading opening 154 adjacent to the window 113 to the first threading opening 153 arranged away from the window 113 in the radial direction, so as to provide a sufficient cutting space for the cutting member 130, and facilitate the flexible arrangement of the cutting member 130 in the sheath 110.

In this embodiment, the distal face of the slider 150 is planar and is flush with the distal end of the sheath 110. In the modified embodiment, the distal end surface of the slider 150 is a curved surface protruding toward the distal end, and the curved surface protrudes beyond the distal end of the sheath 110 when the slider 150 does not slide toward the proximal end relative to the sheath 110, so that when the wire 90 moves toward the proximal end relative to the cutting assembly 100, if the cutting assembly 100 pushes toward the distal end in the sheath, the distal end surface protruding toward the distal end of the slider 150 is beneficial to reducing friction with the sheath during advancing, and makes the cutting assembly 100 bend more smoothly under the guidance of the sheath, thereby being beneficial to better protecting the inner wall of the sheath and improving the operation experience. In some embodiments, the distal surface of the slider 150 is a curved surface, such as a partially spherical or ellipsoidal surface.

The main body 151 of the slider 150 is further formed with a cutting groove 155 extending in the axial direction, and the cutting member 130 is received in the cutting groove 155, and the cutting member 130 slides in the cutting groove 155 during the axial movement of the slider 150 with respect to the sheath 110. Specifically, the extending direction of the cutting groove 155 is the same as the extending direction of the cutting element 130, and the sliding block 150 is sleeved on the periphery of the cutting element 130, so that the position of the sliding block 150 and the channel 152 thereof is limited in the circumferential direction in the sheath 110, and the sliding block 150 is prevented from rotating.

The distal end of the cutting slot 155 extends to communicate with the channel 152, and during axial movement of the slider 150 to the proximal limit, the cutting edge 132 slides through the channel 152 until it abuts the distal end of the cutting slot 155. In this embodiment, the cutting groove 155 extends axially or in a position parallel to the axis, the channel 152 is disposed obliquely with respect to the axis, the cutting groove 155 is communicated with the channel 152 and continues to extend distally after intersecting and communicating with the channel 152, and the cutting element 130 more easily cuts off the wire 90 in the cutting groove 155 on the distal side of the channel 152 when the cutting groove 155 is located horizontally beyond the sidewall of the channel 152, thereby improving the success rate of cutting the wire 90. In a modified embodiment, the distal end of the cutting groove 155 extends to communicate with the channel 152, but is not provided at a portion that is distal beyond the side wall of the channel 152 in the horizontal position of the cutting groove 155.

To facilitate device assembly, the proximal end of the cutting flutes 155 extend through to the proximal face of the body 151.

To facilitate coupling of the slider 150 to the handle 800 via a pull member, which allows the handle 800 to manipulate the slider 150 proximally, the slider 150 includes a link member 156 coupled to the body 151, and the pull member is coupled to the link member 156. A pulling member, which may be a rigid member or a flexible member 200 in this embodiment, is connected between the slider 150 and the handle 800. In embodiments where the retractor is rigid, the retractor is not bendable and can be used for body surface or linear body cutting in surgery.

In this embodiment, the pulling member is a flexible member 200, and the flexible member 200 has flexibility and can be bent along the trend of a blood vessel, so that the flexible member can be suitable for interventional operation and enters a patient body to perform linear body cutting in a channel formed by body surface puncture. Correspondingly, a flexible guide tube 300 is further arranged between the cutting assembly 100 and the handle 800, the flexible member 200 is arranged in the guide tube 300 in a penetrating manner, the guide tube 300 is connected between the handle 800 and the sheath 110, the handle 800 comprises an operating member 810 capable of moving along the axial direction, the proximal end of the flexible member 200 is connected with the operating member 810, the distal end of the flexible member 200 is connected with the connecting member 156 of the slider 150, and the operating member 810 can drive the flexible member 200 to pull the slider 150 to move towards the proximal end.

As shown in fig. 4, 8 to 9, the main body 151 of the slider 150 is formed with a receiving hole 157 communicating with the cut groove 155, the connecting member 156 is received in the receiving hole 157, the cut groove 155 communicates with the receiving hole 157 at a position where the connecting member 156 is exposed, and the flexible member 200 is fixed to the connecting member 156 through the cut groove 155 from the proximal end. In the present embodiment, the connection member 156 has a cylindrical shape, and the receiving hole 157 is disposed at the proximal end of the body 151 and extends in a radial direction, and in other embodiments, the connection member 156 is not limited to the cylindrical shape, and the receiving hole 157 is not limited to the proximal end of the body 151 and may extend in other directions.

The flexible member 200 may be wound around the connecting member 156, or welded or bonded to the connecting member 156.

In this embodiment, the distal end of the flexible member 200 is sleeved on the connecting member 156. Specifically, the distal end of the flexible member 200 forms a collar 221, and when the device is assembled, the collar 221 extends into the main body 151 from the cut groove 155, is placed on the outer periphery of the receiving hole 157, and the connector 156 is inserted from one end of the receiving hole 157, and the connector 156 is inserted into the collar 221, so that the collar 221 is sleeved on the surface of the connector 156.

In a modified embodiment, the slider 150 omits the connector 156 and the receiving hole 157, and the flexible member 200 is fixed to the proximal end of the slider 150 by welding or bonding.

As shown in fig. 8-9, in a state where the slider 150 is not slid proximally relative to the sheath 110, i.e., the clinician does not actuate the cutting operation, the proximal end of the cutting element 130 abuts against the distal end of the connecting element 156 in the cutting groove 155 via the collar 221, thereby distally limiting the slider 150 and preventing the slider 150 from being pulled out of the distal end of the sheath 110. In embodiments where the flexible member 200 does not extend between the cutting member 130 and the coupling member 156 (the flexible member 200 otherwise being secured to the coupling member 156), the proximal end of the cutting member 130 directly contacts and abuts the distal end of the coupling member 156 in the cutting slot 155.

As shown in fig. 4, in the present embodiment, the flexible member 200 includes two end portions, an end portion 210 and an end portion 230, and a middle section 220 between the two end portions, the middle section 220 surrounds the connecting member 156 and forms a collar 221, one end portion 210 of the two end portions is fixed to the middle section 220 in the sheath 110, and the end portion 230 is connected to the operation member 810. In this embodiment, the end portion 210 is spirally wound on the surface of the middle section 220 in the sheath 110, so as to achieve a stable connection, and optionally, the end portion 210 and the middle section 220 are fixed by welding.

In a modified embodiment, the end portion 210 is not connected to the intermediate segment 220, and both the end portion 210 and the end portion 230 extend proximally and are directly connected to the operation member 810, which is beneficial to reduce the pulling force on each end portion, reduce the risk of deformation or breakage of the flexible member 200, and improve the reliability of the thread cutting device 10.

In this embodiment, the main body 151 of the slider 150 is substantially cylindrical and wraps around the cutting element 130, and in a modified embodiment, the slider 150 is disposed on one side of the cutting element 130, for example, as a partial cylinder cut along the axial direction, and the proximal end of the slider 150 is connected by the flexible element 200 in other manners, such as welding or bonding.

The thread cutting device 10 further includes a first elastic member 170 accommodated in the sheath 110, a distal end of the first elastic member 170 abuts against a proximal end of the slider 150, a proximal end of the first elastic member 170 abuts against an inner wall of a proximal end of the sheath 110, and a proximal opening diameter of the tail tube 117 of the sheath 110 is smaller than a diameter of the first elastic member 170, so as to prevent the first elastic member 170 from coming out of the proximal end of the sheath 110. After the clinician releases the operating member 810, the first resilient member 170 is adapted to slide distally against the slide 150.

Particularly, in the embodiment where the pulling member is the flexible member 200, even if the operating member 810 moves distally after the clinician releases the operating member 810, the operating member 810 cannot drive the flexible member 200 to move distally synchronously. During the process of pulling the operation member 810, the flexible member 200 and the slider 150 move proximally, and the first elastic member 170 is compressed; after the operation element 810 is released, the first elastic element 170 elastically recovers to drive the slider 150 and the flexible element 200 to move towards the distal end, so that the flexible element 200 is straightened in the axial direction, and the next tangent operation is facilitated.

Referring to fig. 1, 3 and 10, the handle 800 includes a housing 820, and the housing 820 is formed by two housing parts fastened and fixed to each other. The housing 820 is formed with a first sliding groove 821 extending in an axial direction through an inner cavity thereof, the operating member 810 includes a main shaft 811 and a handle 818, the main shaft 811 is received in the housing 820 and connected to the flexible member 200, and the handle 818 is connected to a side surface of the main shaft 811 and extends out of the housing 820 through the first sliding groove 821.

The main shaft 811 extends in the axial direction in the housing 820, and the surface thereof is provided with ribs to improve mechanical strength. Two handles 818 are disposed on two sides of the main shaft 811, and each handle 818 penetrates through the corresponding first sliding slot 821, i.e. two sliding slots 821 are disposed on two sides of the housing 821. In a modified embodiment, the main shaft 811 is provided with a handle 818 and correspondingly the housing 820 is provided with a corresponding slide slot 821.

The distal end of the main shaft 811 is used to connect the flexible member 200, and the distal end of the slider 150 is ensured to be flush with the distal end of the sheath 110 by adjusting the axial length of the flexible member 200.

Since the flexible member 200 is sleeved with the flexible catheter 300, the slider 150 moves towards the proximal end during the process of pulling the flexible member 200, the catheter 300 is also bent accordingly, the proximal end of the sheath 110 is connected to the distal end of the catheter 300, the catheter 300 drives the sheath 110 to retract, i.e. move towards the proximal end, so that the displacement of the handle 818 relative to the housing 820 is larger than the displacement of the slider 150 relative to the sheath 110 during the tangent process, and the bending degree of the catheter 300 is related to the flexibility thereof. The more flexible the catheter 300, the more bending during the tangent line, the more the sheath 110 retracts, and the greater the difference between the displacement of the handle 818 relative to the housing 820 and the displacement of the slider 150 relative to the sheath 110; the less flexible the catheter 300, the less bending during tangent, and the less retracted the sheath 110, the closer the displacement of the handle 818 relative to the housing 820 is to the displacement of the sled 150 relative to the sheath 110.

In this embodiment, the displacement of the pull tab 818 relative to the housing 820 is greater than the displacement of the cutting member 130 relative to the sheath 110 during the cutting process, i.e., the process in which the handle 800 controls the slider 150 to move proximally, so that the cutting member 130 can move to the distal most end of the cutting slot 155 to effect cutting in the event that the catheter 300 bends during the cutting process.

Accordingly, the proximal end of the sheath 110 is attached to the distal end of the catheter 300, and the flexible catheter 300 bends during the cutting process, providing limited support for the cutting element 130. In the case that the wire body 90 has a relatively high hardness, the hardness of the catheter 300 may be increased, so that the bending degree of the catheter 300 is reduced in the process of cutting the wire, the supporting capability of the catheter 300 for the sheath 110 and the cutting member 130 is improved, and the cutting capability of the cutting member 130 is improved.

Referring to fig. 1 to 3 and 10, the housing 820 is formed with a second sliding slot 822 penetrating to an inner cavity thereof, and in the present embodiment, the second sliding slot 822 extends along a circumferential direction. The handle 800 includes a safety switch 830 inserted in the second sliding groove 822, and the safety switch 830 is configured to slide along the second sliding groove 822 along a circumferential direction to allow or prohibit the movement of the operating member 810.

The safety switch 830 includes a top portion 831 and a locking portion 835 connected to each other, the top portion 831 is exposed outside the housing 820, the locking portion 835 is protruded on a surface of the top portion 831, in this embodiment, the locking portion 835 is protruded on a bottom surface of the top portion 831 and extends in a radial direction toward an axial direction inside the housing 820.

As shown in fig. 10, for clarity, the reinforcing rib is omitted from the surface of the main shaft 811 in fig. 10, the main shaft 811 extends in the axial direction, the limiting groove 812 and the guide groove 813 are formed to communicate with each other, the guide groove 813 extends in the axial direction, and the limiting groove 812 extends in the direction perpendicular to the axial direction.

In the process of sliding along the second sliding groove 822, the top portion 831 passes through a first position and a second position in the circumferential direction, for example, the first position and the second position are ends of two sides of the second sliding groove 822 in the circumferential direction. When the top 831 slides to the first position along the second sliding slot 822, the locking portion 835 is accommodated in the guiding slot 813, or is located in the extending direction of the guiding slot 813, the locking portion 835 can move axially, and the handle 818 can drive the main shaft 811, the flexible element 200 and the slider 150 to move proximally; when the top portion 831 slides to the second position along the second sliding groove 822, the locking portion 835 is received in the limiting groove 812, and the operating element 810 is locked at the axial position, so that the cutting device 10 cannot perform a cutting function.

As shown in fig. 3, the top portion 831 and the locking portion 835 of the safety switch 830 are separate components, the top portion 831 is exposed on the surface of the housing 820 for the clinician to operate, and the locking portion 835 is fixed to the bottom surface of the top portion 831 in a column shape. In order to prevent the safety switch 830 from being separated from the outer side of the housing 820, a fixing member 833 is connected to one side of the bottom surface of the top portion 831, the fixing member 833 is configured to be received in the housing 820, and the top portion 831 and the fixing member 833 are respectively arranged at two sides of the housing 820 and connected to each other. The locking portion 835 extends from the bottom surface side of the top portion 831 through the fixing member 833 toward the axial direction of the thread cutting device 10.

As shown in fig. 3 and 10, the handle 800 includes a second elastic member 840 accommodated in the housing 820, a proximal end of the second elastic member 840 abuts against a proximal inner wall of the housing 820, a distal end of the second elastic member 840 abuts against a proximal end of the operating member 810, specifically, a distal end of the second elastic member 840 abuts against a proximal end of the handle 818, and after the clinician releases the handle 818, the second elastic member 840 pushes the operating member 810 distally, so that the operating member 810 returns to a non-tangent distal position.

Within the spirit of the present application, the specific technical solutions in the above embodiments may be mutually applicable, and are not described herein.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the scope of the present application, so that the present application is not limited thereto, and all equivalent variations and modifications can be made to the present application.

Claims

1. A wire cutting apparatus, comprising:

the handle is arranged at the proximal end of the thread cutting device;

2. The thread cutting device as claimed in claim 1, wherein said sheath comprises an opening formed at a distal end thereof, said slider is formed with a channel, said thread body is adapted to pass through said opening, said channel and said window, and two ends of said thread body are adapted to protrude from said sheath.

3. The thread cutting device as claimed in claim 2, wherein said slider includes a main body, said channel is formed on said main body, said channel includes a first threading opening and a second threading opening formed on said main body, said first threading opening is disposed corresponding to said opening, and said second threading opening is disposed corresponding to said window.

4. The thread cutting device as claimed in claim 3, wherein said second threading port proximal edge is more distal than said window proximal edge in a state where said slider is not slid proximally relative to said sheath.

5. The thread cutting device as claimed in claim 3, wherein a distally facing portion of said first threading opening is disposed to correspond to a side of said opening remote from said window.

6. The thread cutting device as claimed in claim 1, wherein a distal end surface of said slider is curved to project distally, said distal end surface of said slider extending beyond a distal end of said sheath in a state where said slider is not slid proximally relative to said sheath.

7. The thread cutting device as claimed in claim 2, wherein said slider includes a body for defining said passage, said body further defining an axially extending cutting slot, a proximal end of said cutting slot extending through to a proximal end face of said body, a distal end of said cutting slot extending into communication with said passage, said cutting element being received in said cutting slot, said cutting element sliding in said cutting slot during axial movement of said slider relative to said sheath, said cutting edge sliding through said passage until abutting against a distal end of said cutting slot during axial movement of said slider to a proximal limit position.

8. The thread cutting device as claimed in claim 7, wherein said cutting device further comprises a flexible member and a flexible guide tube, said flexible member is disposed through said guide tube, said guide tube is connected between said handle and said sheath, said handle comprises an operating member capable of moving along an axial direction, a proximal end of said flexible member is connected to said operating member, a distal end of said flexible member is connected to said slider, and said operating member is capable of driving said flexible member to pull said slider to move proximally.

9. The thread cutting device as claimed in claim 8, wherein said slider includes a connecting member connected to said main body, said main body being formed with a receiving hole communicating with said cutting groove, said connecting member being received in said receiving hole, said flexible member being fixed to said connecting member from a proximal end through said cutting groove.

10. The tangent device as recited in claim 9, wherein the distal end of the flexible member is sleeved over the attachment member.

11. The tangent device as recited in claim 10, characterized in that the flexible member includes two end portions and a middle section between the two end portions, the middle section surrounding the connecting member, one of the two end portions being secured to the middle section in the sheath; alternatively, both end portions are connected to the operating member.

12. The thread cutting device as claimed in claim 9, wherein a proximal end of said cutting element abuts a distal end of said connecting element in said cutting groove in a state where said slider is not slid proximally relative to said sheath.

13. The thread cutting device as claimed in claim 1, further comprising a first resilient member received within said sheath, a distal end of said first resilient member abutting a proximal end of said slider, a proximal end of said first resilient member abutting an inner wall of a proximal end of said sheath.

14. The thread cutting apparatus as claimed in claim 8, wherein said handle includes a housing defining a first axially extending slot extending through an interior thereof, said operating member including a spindle received in said housing and coupled to said flexible member, and a pull coupled to a side of said spindle and extending out of said housing through said first slot.

15. The thread cutting apparatus as claimed in claim 14, wherein the displacement of said handle relative to said housing during thread cutting is greater than the displacement of said cutting member relative to said sheath.

16. The thread cutting apparatus as claimed in claim 14, wherein said housing is formed with a second slide groove penetrating to an inner cavity thereof, said handle includes a safety switch inserted into said second slide groove, said safety switch includes a top portion and a locking portion connected to each other, said top portion is exposed to an outside of said housing, said locking portion is protrudingly provided on a surface of said top portion, said main shaft is formed with a stopper groove and a guide slide groove connected to each other, said guide slide groove extends in an axial direction, said stopper groove extends in a direction perpendicular to the axial direction; when the top part slides to a first position along the second sliding groove, the locking part is accommodated in the guide sliding groove or positioned in the extending direction of the guide sliding groove, and the handle can drive the main shaft, the flexible part and the sliding block to move towards the near end; when the top part slides to a second position along the second sliding groove, the locking part is accommodated in the limiting groove, and the operating part is locked at the axial position.

17. The thread cutting device as claimed in claim 8, wherein said handle includes a housing and a second resilient member received within said housing, a proximal end of said second resilient member abutting an inner wall of a proximal end of said housing, and a distal end of said second resilient member abutting a proximal end of said operating member.