WO2022143990A1

WO2022143990A1 - Suture cutting device

Info

Publication number: WO2022143990A1
Application number: PCT/CN2021/143720
Authority: WO
Inventors: 吴能标; 高国庆; 王永胜
Original assignee: 杭州德诺电生理医疗科技有限公司
Priority date: 2020-12-31
Filing date: 2021-12-31
Publication date: 2022-07-07
Also published as: CN114680967A

Abstract

Disclosed is a suture cutting device, having a proximal end and a distal end which are opposite to each other. The suture cutting device comprises: a handle disposed at the proximal end; a sheath disposed at the distal end, the sheath being tubular, a window being formed on the side wall of the sheath, and a suture passing through the sheath from the window; a cutting member fixed into the sheath, and comprising a cutting edge used for cutting the suture and facing the distal end; and a sliding block disposed in the sheath, the suture in the sheath being connected to the sliding block, and under the control of the handle, the sliding block driving the suture to slide towards the proximal end with respect to the sheath, so that the suture contacts the cutting edge.

Description

Thread cutting device

technical field

The present application relates to the technical field of medical devices, and in particular, to a thread cutting device.

Background technique

During surgery, after knotting to hold the thread in place, the excess thread needs to be removed. This can be done using scissors or similar tools during open surgery or on the surface of the skin. In minimally invasive surgery, however, most of the work is done through small openings such as catheters, and standard surgical scissors are too large to cut through the opening to remove the wire body.

Devices have been developed that have the ability to cut the wire body by means of a mechanism provided on the end of a long rod that fits into these confined spaces. When the thread is trimmed, these devices can easily cause the indwelling thread knot to be too long, making the absorption time of the thread knot long, and the foreign body of the indwelling thread is likely to cause a foreign body reaction.

technical solutions

The present application provides a thread cutting device having opposite proximal ends and distal ends, the thread cutting device comprising:

a handle, arranged at the proximal end;

a sheath, disposed at the distal end, the sheath is tubular, a window is formed on the side wall of the sheath, and the wire is used to pass through the sheath from the window;

a cutting member, secured in the sheath, including a distally facing cutting edge for cutting the wire; and

The slider is arranged in the sheath, the wire in the sheath is connected with the slider, and the slider can drive the wire relative to the sheath under the control of the handle Slide proximally so that the wire contacts the cutting edge.

During the operation, when the thread tail of the thread body needs to be cut, the thread cutting device provided in the present application can be used, wherein the slider drives the thread body at the thread end to slide toward the proximal end, so that the thread body contacts the cutting The blade realizes the tangent function. The slider is used to drive the wire body to move to the proximal end so that the wire body contacts the cutting edge, so that the length of the wire tail after tangent is shorter, which is beneficial to shorten the absorption time of the wire tail and reduce the foreign body reaction caused by the indwelling wire body.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic structural diagram of a thread cutting device provided by the present application.

FIG. 2 is a cross-sectional view of the thread cutting device shown in FIG. 1 along the line A-A.

FIG. 3 is an exploded view of the thread cutting device shown in FIG. 1 .

FIG. 4 is an enlarged view of some parts of FIG. 3 .

FIG. 5 is a schematic structural diagram of another perspective view of the sleeve of the thread cutting device in FIG. 3 .

FIG. 6 is a schematic structural diagram of another perspective view of the slider of the thread cutting device in FIG. 3 .

FIG. 7 is a schematic structural diagram of the wire tangent assembly shown in the structure shown in FIG. 1 after penetrating the wire body.

FIG. 8 is a cross-sectional view of the distal end portion along the line A-A in a non-tangent state after the thread cutting device in FIG. 1 is inserted into the thread body.

FIG. 9 is a sectional view of the distal end part along line A-A in a state where the thread cutting device in FIG. 8 is inserted into the thread body and the thread cutting is completed.

FIG. 10 is a schematic structural diagram of the thread cutting device shown in FIG. 1 after disassembling one side shell of the casing.

Embodiments of the present invention

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

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

Where a numerical range is disclosed in this application, unless otherwise indicated, the range is continuous and includes the minimum and maximum values of the range and every value between those minimum and maximum values. Still further, where a range refers to an integer, only integers from the minimum value to and including the maximum value of the range are included. Furthermore, where multiple ranges are provided to describe a feature or characteristic, such ranges can be combined.

As used in this application, the terms "distal" and "proximal" refer to the clinician or operator at the time of surgery. "Distal" or "remotely" refers to a location away from or in a direction away from a clinician or operator. "Proximal" or "proximally" refers to a position proximate to or towards the clinician or operator.

In addition, the direction of the rotation center axis of objects such as cylinders and tubes is defined as the axial direction, and the direction perpendicular to the axial direction is defined as the radial direction. These definitions are only for the convenience of expression and do not constitute a limitation to the present application.

The present application provides a thread cutting device for cutting a thread body, which is a thread body that can be implanted in the body, such as a surgical suture thread in the body or on the body surface, a metal wire for attachment of an intrabody implant, and the like. For example, after the thread is knotted in the body or on the body surface, when the thread at the end of the thread needs to be cut off, or when the thread is connected to the implant in the body, after the implant is released in the body, it is necessary to connect the thread to the thread. When cutting to disconnect the connection between the implant and the delivery device, the thread cutting device provided in this application can be used to cut the thread body. Short, it is beneficial to provide a suitable length of the wire tail, shorten the absorption time of the wire tail, and reduce the foreign body reaction caused by the indwelling wire body.

As shown in FIGS. 1-3 , the thread cutting device 10 includes a cutting assembly 100 disposed at the distal end of the thread cutting device 10 , and a handle 800 disposed at the proximal end of the thread cutting device 10 . The cutting assembly 100 is used for approximating and cutting the wire body at the distal end, and the handle 500 is used for the clinician to hold and control the cutting action of the cutting assembly 100 .

Please refer to FIGS. 4 to 7 together, the cutting assembly 100 includes a sheath 110 , a cutting member 130 and a sliding block 150 . The sheath 110 has a tubular shape. The sheath 110 is formed with openings at the proximal end and the distal end, respectively, and a window 113 is formed in the side wall of the sheath 110 . The wire body 90 ( FIGS. 8-9 ) can be passed through the sheath 110 from the window 113 . A cutter 130 is secured in the sheath 110 and includes a distally facing cutting edge 132 for cutting the wire body 90 . The slider 150 is disposed in the sheath 110 and is used for connecting with the wire body 90 in the sheath 110 . Under the control of the handle 800 , the slider 150 drives the wire body 90 to slide toward the proximal end relative to the sheath, so that the wire body 90 contacts the cutting edge 132 , thereby realizing the tangent effect.

The slider 150 is used to drive the wire body 90 to move proximally so that the wire body 90 contacts the cutting edge 132 . The moving range of the slider 150 towards the proximal end can be set to be smaller, and after the wire body 90 is connected to the slider 150, the axial dimension of the part of the slider 150 at the distal end of the wire body 90 can be set smaller, so that after the thread is cut The length of the line tail is shorter. But in fact, too short thread tails may cause the knots to loosen and need to be re-tied; if the knots loosen after the operation, it will cause extremely serious surgical complications and require reoperation. Therefore, in the thread cutting device 10 provided in this application, the size of the slider can be designed according to actual needs, and on the basis of ensuring the safety of the operation, the reserved length of the thread tail after thread cutting can be shortened, which is beneficial to shorten the absorption time of the thread tail and reduce the Foreign body reaction caused by indwelling thread.

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

The cutting member 130 is fixed in the sheath 110, and the sheath 110 may be made of a metal material with good biocompatibility such as stainless steel. The cutting member 130 and the sheath 110 may be made of the same material. In some embodiments, the material of the cutting member 130 and the sheath 110 may be different, and the hardness of the cutting member 130 may be greater than that of the sheath 110 .

In order to facilitate device assembly, 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. During assembly, the conduit 111 and the tail pipe 117 are sleeved with each other and can be fixed by welding or bonding. It can be understood that, in the modified embodiment, the sheath 110 can also be an integral structure.

The wire conduit 111 is tubular and is sleeved on the periphery of the cutting member 130 and the slider 150 . An opening 112 is formed at the distal end of the wire conduit 111 , and a window 113 is formed on the side wall of the wire conduit 111 . In this embodiment, the path of the wire body passing through the wire conduit 111 is as follows: passing through the opening 112 , connecting the slider 150 , and then passing through the window 113 ; or passing through the window 113 , connecting the slider 150 , and passing through the window 113 The opening 112 passes through. 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, and the wire is used to pass through the two windows in sequence.

The cutting member 130 is fixed inside the wire conduit 111 . Specifically, two oppositely arranged fixing grooves 114 are formed on the inner wall of the wire conduit 111 . The cutting member 130 is in the shape of a sheet, a protrusion 133 is formed on both sides of the main body 131 , and the two protrusions 133 are respectively accommodated in the two fixing grooves 114 . In this embodiment, the fixing grooves 114 extend in the axial direction, so that the cutting members 130 are arranged in the axial direction. In a modified embodiment, the fixing grooves 114 of other structures may be provided according to the specific shape of the cutting member 130 , or the cutting member 130 may be fixed in other ways. In the modified embodiment, the included angle between the fixing groove 114 and the axis is greater than 0 degrees, that is, the fixing groove 114 and the cutting member 130 are disposed obliquely in the sheath 110 .

The tail pipe 117 has a tubular shape and is used to be sleeved with the proximal end of the wire-passing pipe 111 . The interior of the tail pipe 117 is used for accommodating other components, and the proximal end of the tail pipe 117 is provided with an opening. Preferably, in this embodiment, the tail pipe 117 is sleeved on the periphery of the wire-passing pipe 111 , so that the interference between the tail pipe and the fixing groove 114 (ie, the cutting member 130 ) can be avoided. It can be understood that, in other embodiments, the tail pipe can also be embedded in the wire conduit 111. In this case, in order to avoid interference between the distal end of the tail pipe 117 and the fixing groove 114, the length or thickness of the wire passage needs to be increased. In other embodiments, the cutting member 130 may also be provided in the tail pipe, that is, a fixing groove for fixing the cutting member 130 is provided in the tail pipe.

Please refer to FIGS. 4 and 6 to 9 together, the slider 150 is formed with a channel 152 , the wire body 90 is used to pass through the opening 112 , the channel 152 and the window 113 , and both ends of the wire body 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 , the channel 152 includes a first threading port 153 and a second threading port 154 formed on the outer wall of the main body 151 , and a communication cavity 159 extending in the body 151 . The first thread opening 153 and the second thread opening 154 are respectively formed on opposite sides of the axis of the main body 151 . The communication cavity 159 communicates the first threading port 153 and the second threading port 154 . The first threading port 153 is provided corresponding to the opening 112, and the second threading port 154 is provided corresponding to the window 113, thereby reducing the resistance of the wire. Preferably, in this embodiment, the size of the window 113 is larger than the size of the second thread opening 154 . More preferably, the projection of the second thread opening 154 on the side wall of the sheath is within the range of the window 113 .

As shown in FIG. 8 to FIG. 9 , the extending direction of the communication cavity 159 of the channel 152 is inclined compared to the axis of the cutting assembly 100 , and the communication cavity 159 and the axis form two complementary angles, wherein the angle toward the proximal end is relatively high. small, the smaller included angle is preferably in the range of 20° to 70°. The smaller the included angle is, the closer the extension direction of the channel 152 is to the axis, the lower the resistance to the proximal pulling wire body 90, and the longer the axial length of the channel. In this embodiment, since the cutting member 130 is arranged in the axial direction , the smaller the angle, the closer the wire body 90 extends in the channel 152 to the cutting edge 132, and the more difficult the cutting is; The shorter the axial length, the less difficult it is to cut. In some embodiments, in order to reduce the resistance of the pulling wire, the channel 152 is rounded, especially at the corners.

In some embodiments, the distal end of the main body 151 of the slider 150 is hook-shaped, the hook-shaped distal end forms the aforementioned channel 152 , and the hook-shaped distal end is used for pulling the wire body 90 to move proximally.

As shown in FIG. 8 , when the slider 150 does not slide toward the proximal end relative to the sheath 110, the thread cutting device 10 does not perform a cutting action, and the clinician can pass the thread through the sheath 110 and the slider 150, hold the thread The free end of the body 90 protruding from the window 113 allows the sheath 110 to move relative to the free end of the wire body 90, such as pulling the free end of the wire body 90 proximally, or holding the free end and pushing the cutting assembly distally 100 until the distal end of the sheath 110 reaches the target cutting site (eg, body tissue or implant). When the slider 150 does not slide proximally relative to the sheath 110 , the proximal edge of the second threading port 154 is closer to the distal end than the proximal edge of the window 113 , that is, the slider 150 can be seen from the window 113 . The main body 151 on the proximal side of the second threading port 154 . The frictional force generated when the free end of the wire body 90 passes through the window 113 and is pulled toward the proximal end by the clinician is mainly concentrated on the proximal edge of the window 113 where the wire body 90 contacts.

In the present embodiment, the proximal edge of the second threading port 154 is closer to the distal end than the proximal edge of the window 113 , which is beneficial to adjust the extension direction of the distal wire body 90 at the proximal edge of the window 113 to be more gentle and smoother. Close to the direction of the axis, so that the extension directions of the distal wire body 90 and the proximal wire body 90 at the proximal edge of the window 113 are similar, reducing the bending angle of the wire body 90 at the proximal edge of the window 113, which is beneficial to reduce the wire body 90 The frictional force generated at the window 113 during the process of pulling the free end to the proximal end makes the pulling wire smoother and labor-saving, and shortens the operation time.

In the embodiment in which the proximal edge of the second threading port 154 is radially aligned with the proximal edge of the window 113, after the thread 90 passes through the channel 152, the proximal edge of the window 113 is bent and then extends toward the proximal end. The bending angle of the body 90 at the proximal edge of the window 113 is relatively large, the friction force of the pulling wire is relatively large, and the pulling wire is laborious and time-consuming.

In some embodiments, the proximal edge of the second threading port 154 and the proximal edge of the window 113 are rounded to reduce the resistance of the wire.

As shown in FIGS. 8 and 9 , the main body 151 at the distal side of the channel 152 is a reserved portion 158 for pulling the wire body toward the proximal end. The reserved portion 158 extends radially beyond the plane in which the cutting element 130 is located. The length of the wire tail after tangent is the distance between the wire body 90 from the opening 112 to the cutting edge 132 , which is related to the dimension of the channel 152 and the reserved portion 158 along the axial direction on the plane where the cutting member 130 is located. Wherein, the channel 152 is used for the wire body 90 to be cut to pass through, and its dimension in the axial direction can be designed to be small, so long as it can accommodate the wire body 90 . The reserved portion 158 is used to drive the wire body 90 to move toward the proximal end, and its axial dimension can be designed to be smaller, that is, the smaller thickness of the reserved portion 158 does not affect the pulling of the wire toward the proximal end. Therefore, the thread cutting device 10 provided by the present application can ensure a shorter length of the thread tail, which is beneficial to shorten the absorption time of the thread tail and reduce the foreign body reaction caused by the indwelling thread body.

As shown in FIG. 4 and FIGS. 6 to 9 , the first thread opening 153 is irregular in shape, and is formed on the distal end surface and the side wall of the main body 151 . The first threading port 153 has an axial opening portion facing the distal end, and also includes a radial opening portion extending radially outward. It is convenient for threading, and in the process of moving the wire body 90 toward the proximal end relative to the cutting assembly 100 , it is beneficial to reduce frictional resistance, especially when a large number of cutting wire bodies 90 are required at one time, the effect is more obvious.

The axial opening portion of the first threading port 153 toward the distal end is disposed corresponding to the 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 port 153 , so that the radial extension of the wire body 90 in the channel 152 is relatively large. Large, extending from the second threading opening 154 adjacent to the window 113 to the first threading opening 153 disposed radially away from the window 113 , providing sufficient cutting space for the cutting member 130 to facilitate the flexible arrangement of the cutting member 130 in the sheath 110 Location.

In this embodiment, the distal end surface of the slider 150 is flat, and the distal end surface is flush with the distal end of the sheath 110 . In a modified embodiment, the distal surface of the slider 150 may be a curved surface that protrudes toward the distal end. When the slider 150 does not slide toward the proximal end relative to the sheath 110 , the distal surface of the slider 150 may exceed the the distal end of the sheath 110 so that during the proximal movement of the wire 90 relative to the cutting assembly 100, if the cutting assembly 100 is advanced distally in the sheath, the distally protruding distal face of the slider 150 It is beneficial to reduce the friction with the sheath tube during the traveling process, and make the cutting assembly 100 turn more smoothly under the guidance of the sheath tube, which is beneficial to better protect the inner wall of the sheath tube and improve the operation experience. In some embodiments, the distal surface of the slider 150 is an arc surface, such as a partial spherical surface or an ellipsoidal surface.

The main body 151 of the slider 150 is further formed with a receiving groove 155 extending in the axial direction, and the cutting member 130 is received in the receiving groove 155 . During the axial movement of the slider 150 relative to the sheath 110 , the cutting member 130 slides in the receiving groove 155 . Specifically, the extending direction of the receiving groove 155 is consistent with the extending direction of the cutting member 130 , and the sliding block 150 is sleeved on the periphery of the cutting member 130 , so that the position of the sliding block 150 and its channel 152 is limited in the circumferential direction of the sheath 110 position to prevent the slider 150 from rotating.

The distal end of the receiving groove 155 extends to communicate with the channel 152 . During the axial movement of the slider 150 to the proximal limit position, the cutting edge 132 slides through the channel 152 until it abuts against the distal wall of the receiving groove 155 . In this embodiment, the accommodating groove 155 extends along the axial direction, or extends along a position parallel to the axis, the channel 152 is inclined relative to the axis, and the accommodating groove 155 communicates with the channel 152 . The accommodating groove 155 continues to extend to the distal end after intersecting with the channel 152 . When the accommodating groove 155 is in a horizontal position, it exceeds the side wall surface of the channel 152 . The wire body 90 is cut, which improves the success rate of cutting the wire body 90 . In the modified embodiment, the distal end of the accommodating groove 155 extends to communicate with the channel 152 , but on the plane where the accommodating groove 155 is located, the distal end of the accommodating groove 155 does not exceed the sidewall surface of the channel 152 .

In order to facilitate device assembly, the proximal end of the receiving groove 155 penetrates to the proximal end surface of the main body 151 .

In order to facilitate the connection between the slider 150 and the handle 800 through a pulling member, so that the handle 800 can control the slider 150 to move proximally, the slider 150 includes a connecting member 156 connected to the main body 151 , and the pulling member is connected with the connecting member 156 . The pulling member is connected between the slider 150 and the handle 800, and the pulling member may be a rigid member or the flexible member 200 in this embodiment. In the embodiment in which the pulling member is a rigid member, the pulling member cannot be bent and can be used for wire cutting on the body surface or in a surgical operation.

In this embodiment, the pulling member is a flexible member 200, and the flexible member 200 is flexible and can be bent along the direction of the blood vessel, so that it can be applied to interventional surgery, entering the body of the patient through the channel formed by the puncture on the body surface to carry out the thread body. cut. Correspondingly, a flexible conduit 300 is further disposed between the cutting assembly 100 and the handle 800 , the flexible member 200 is passed through the conduit 300 , and the conduit 300 is connected between the handle 800 and the sheath 110 . The handle 800 includes an operating member 810 that can move in the axial direction. The proximal end of the flexible member 200 is connected to the operating member 810, and the distal end of the flexible member 200 is connected to the connecting member 156 of the slider 150. The operating member 810 can drive the flexible member 200 to pull the slider. 150 moves proximally.

As shown in FIGS. 4 , 8 to 9 , the main body 151 of the slider 150 is formed with an accommodating hole 157 that communicates with the accommodating groove 155 , the connecting piece 156 is accommodated in the accommodating hole 157 , and the position where the accommodating groove 155 communicates with the accommodating hole 157 At this point, the connecting member 156 is exposed, and the flexible member 200 is fixed to the connecting member 156 through the receiving groove 155 from the proximal end. In this embodiment, the connecting member 156 is cylindrical, and the accommodating hole 157 is provided at the proximal end of the main body 151 and extends radially. 151 and may extend in other directions.

The flexible member 200 may be wound and fixed on the connecting member 156 , or fixed on the connecting member 156 by welding or bonding.

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. When the device is assembled, the collar 221 extends into the main body 151 from the accommodating groove 155, so that the inner hole formed by the collar 221 is aligned with the accommodating hole 157, and the inner hole formed by the collar 221 is aligned with the accommodating hole 157. One end of the connector 157 is inserted into the connector 156 , 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 flexible member 200 is fixed to the proximal end of the slider 150 by welding or bonding. In this case, the connecting member 156 and the accommodating hole 157 on the slider 150 can be omitted.

As shown in FIGS. 8-9 , when the slider 150 does not slide toward the proximal end relative to the sheath 110 , that is, when the clinician does not drive the tangential operation, the proximal end of the cutting member 130 passes through the sheath in the receiving groove 155 The ring 221 abuts against the distal end of the connecting piece 156 , so as to limit the distal end limit position of the slider 150 and prevent the slider 150 from coming out of the distal end of the sheath 110 . In the embodiment where the flexible member 200 does not extend between the cutting member 130 and the connecting member 156 (the flexible member 200 is fixed to the connecting member 156 in other forms), the proximal end of the cutting member 130 directly contacts and abuts in the receiving groove 155 The distal end of the connector 156 .

As shown in FIG. 4 , in this embodiment, the flexible member 200 includes two ends and a middle section 220 between the two ends, the two ends are respectively the end 210 and the end 230 , and the middle section 220 Located in the sheath, the distal end of which forms the collar 221 for fitting around the connector 156 . One of the two ends 210 is fixed to the middle section 220 in the sheath 110 , and the other end 230 is connected to the operating member 810 . In this embodiment, the end portion 210 is helically wound around the peripheral surface of the middle portion 220 from the distal end of the middle portion 220 , extends to the proximal end and is fixed to the middle portion of the middle portion 220 , so as to realize a stable connection. Optionally, the end portion 210 It is fixed with the middle section 220 by welding.

In the modified embodiment, the end portion 210 is not connected to the middle section 220, and both the end portion 210 and the end portion 230 extend toward the proximal end and are directly connected to the operating member 810, which is beneficial to reduce the tensile force on each end portion. It is beneficial to reduce the risk of deformation or breakage of the flexible member 200 and improve the reliability of the thread cutting device 10 .

In the present embodiment, the main body 151 of the sliding block 150 is substantially cylindrical and covers both sides of the cutting member 130 . In a modified embodiment, the sliding block 150 is disposed on one side of the cutting member 130 , such as cutting along the axial direction. In the latter part of the cylinder, the proximal end of the slider 150 is connected with the flexible member 200 in other ways, such as welding or bonding.

The thread cutting device 10 further includes a first elastic member 170 accommodated in the sheath 110 . For the inner wall of the proximal end, the diameter of the proximal opening of the tail tube 117 of the sheath 110 is smaller than the diameter of the first elastic member 170 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 elastic member 170 is used to push the slider 150 and slide to the distal end.

Especially in this embodiment where the pulling member is the flexible member 200, after the clinician drives the slider 150 to move proximally through the operating member 810, the operating member 810 is released or even if the operating member 810 is driven to move distally, the operating member 810 Also, the flexible member 200 cannot be driven to move to the distal end synchronously. To this end, the first elastic member 170 is provided in this embodiment. During the process of pulling the operating member 810, the flexible member 200 and the slider 150 move towards the proximal end, and the first elastic member 170 is compressed; after the operating member 810 is released , the first elastic member 170 is elastically restored, and drives the slider 150 and the flexible member 200 to move to the distal end, so that the flexible member 200 is straightened in the axial direction, which is convenient for the next tangent operation.

Please refer to FIG. 1 , FIG. 3 and FIG. 10 together. The handle 800 includes a casing 820 , and the casing 820 is composed of two parts of the casing that are relatively fastened and fixed. The side wall of the housing 820 is formed with a first sliding groove 821 penetrating into the inner cavity thereof, and the first sliding groove 821 extends in the axial direction. The operating member 810 includes a main shaft 811 and a handle 818 . The main shaft 811 is accommodated in the housing 820 and is connected to the flexible member 200 . One end of the handle 818 is connected to the side surface of the main shaft 811 , and the other end extends out of the housing 820 through the first chute 821 .

The main shaft 811 extends in the axial direction in the housing 820, and the surface of the main shaft 811 is provided with reinforcing ribs to improve the mechanical strength. Two sides of the main shaft 811 are respectively provided with the handle 818 , and both sides of the housing 820 are provided with the first chute 821 to correspond to the two handles 818 respectively. Each handle 818 passes through the corresponding first chute 821 . In a modified embodiment, the main shaft 811 can also be provided with only one handle 818 , and correspondingly, the housing 820 is provided with a corresponding chute 821 .

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

Since the flexible member 200 is sheathed with a flexible catheter 300 , the distal end of the catheter 300 is connected to the proximal end of the sheath 110 . During the process of pulling the flexible member 200, the slider 150 moves toward the proximal end, and the catheter 300 will also bend accordingly. The catheter 300 drives the sheath 110 to retract, that is, move toward the proximal end, resulting in the pull handle 818 during the tangent process. The displacement relative to the housing 820 is greater than the displacement of the slider 150 relative to the sheath 110 . The bending degree of the catheter 300 is related to its flexibility. The greater the flexibility of the catheter 300, the greater the bending degree during the tangent process, and the greater the retraction degree of the sheath 110, the displacement of the handle 818 relative to the housing 820 is the same as that of the slider 150 relative to the sheath. The larger the gap between the displacements of the sleeves 110; the smaller the flexibility of the catheter 300, the smaller the degree of bending during the tangent process, and the smaller the retraction degree of the sheath 110, the displacement of the handle 818 relative to the housing 820 is the same as the displacement of the slider 150 relative to the casing 820. The closer the displacement of the sheath 110 is, the smaller the difference.

In this embodiment, during the tangent process, that is, during the process that the handle 800 controls the slider 150 to move proximally, the displacement of the handle 818 relative to the housing 820 is greater than the displacement of the cutting member 130 relative to the slider 150 .

Correspondingly, the proximal end of the sheath 110 is connected to the distal end of the catheter 300 . During the tangent process, the flexible catheter 300 is bent, and the supporting force for the cutting member 130 is limited. When the hardness of the wire body 90 is relatively high, the hardness of the catheter 300 can be increased, so that the bending degree of the catheter 300 is reduced during the tangent process, and the supporting capacity of the catheter 300 to the sheath 110 and the cutting member 130 is improved, thereby improving the cutting The cutting capability of the piece 130.

Referring to FIGS. 1 to 3 and 10 , the sidewall of the housing 820 is formed with a second chute 822 penetrating into the inner cavity thereof. In this embodiment, the second chute 822 extends along the circumferential direction. The handle 800 includes a safety switch 830 inserted in the second sliding slot 822 , and the safety switch 830 can slide along the second sliding slot 822 in the 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 that are connected to each other. The top portion 831 is exposed outside the housing 820 , and the locking portion 835 is protruded from the surface of the top portion 831 . The direction extends in the axial direction inside the housing 820 .

As shown in FIG. 10 , for the sake of clarity, reinforcing ribs are omitted on the surface of the main shaft 811 in FIG. 10 , the main shaft 811 extends in the axial direction, and the main shaft 811 is formed with a limit groove 812 and a guide groove 813 that 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. Preferably, in a cross-sectional view passing through the axis of the handle 800 , the guide chute 813 and the limiting slot 812 form an L-shape as a whole, that is, one end of the guide chute 813 is vertically connected to the end of the limiting slot 813 . In other embodiments, in the cross-sectional view passing through the axis of the handle 800, the guide groove 813 and the limiting groove 812 can also form a T-shape as a whole. In this case, one end of the limiting groove 812 is vertically connected to the guide groove 812. The axial middle of the chute 813 .

During the sliding process of the top portion 831 along the second chute 822 , it passes through the first position and the second position in the circumferential direction. When the top 831 slides to the first position along the second chute 822, the locking portion 835 is accommodated in the guide chute 813, or is located in the extending direction of the guide chute 813 (ie, the position aligned with the guide chute 813), At this time, the locking portion 835 can move in the axial direction, and the handle 818 can drive the main shaft 811, the flexible member 200 and the slider 150 to move proximally; when the top 831 slides to the second position along the second sliding groove 822, the locking portion 835 and the The guide chute 813 is not aligned, and is limited by the wall of the limiting groove 812, and the position of the operating member 810 in the axial direction is locked. At this time, the cutting device 10 cannot perform cutting action.

As shown in FIG. 3 , the top 831 and the locking portion 835 of the safety switch 830 are discrete components. The top 831 is exposed on the surface of the housing 820 for operation by clinicians. The locking portion 835 is cylindrically fixed on the bottom surface of the top 831 . In order to prevent the safety switch 830 from coming out of the outer casing 820, the bottom side of the top 831 is connected with a fixing member 833, and the fixing member 833 is accommodated inside the casing 820. The top 831 and the fixing member 833 are arranged on the inner and outer sides of the casing 820 and mutually connect. The locking portion 835 passes through the fixing member 833 from the bottom side of the top portion 831 and extends toward the interior of the housing 820 . Preferably, the locking portion 835 extends at least partially along the radial direction of the thread cutting device 10 .

As shown in FIG. 3 and FIG. 10 , the handle 800 further includes a second elastic member 840 accommodated in the housing 820 , the proximal end of the second elastic member 840 abuts against the inner wall of the proximal end of the housing 820 , and the distal The end abuts the proximal end of the operating member 810, specifically, the distal end of the second elastic member 840 abuts the proximal end of the pull handle 818. After the clinician releases the pull handle 818, the second elastic member 840 pushes the operating member 810 to the distal end, so that the The operating member 810 returns to the distal position where the tangent is not performed.

The cutting device provided by the embodiments of the present application can be used for cutting the body surface wire and cutting the wire body in surgery. The cutting device adopts a cutting drive mode in which the slider moves toward the proximal end, so that it is possible for the thread cutting device to be connected between the sheath at the distal end, the slider and the handle at the proximal end by using a flexible device. When the flexible device is connected between the sheath, the slider and the handle, the flexible component can enter the patient's body through the body surface puncture along the blood vessel to reach the target position, that is, use an interventional method to cut the thread in the patient's body It is beneficial to expand the applicable scope of the cutting device.

Within the scope of the spirit of the present application, the specific technical solutions in the above embodiments may be mutually applicable, which will not be repeated here.

What is disclosed above is only the preferred embodiment of the present application, and of course, it cannot limit the scope of the right of the present application. Therefore, the equivalent changes made according to the claims of the present application are still within the scope of the present application.

Claims

A tangent device, having opposite proximal and distal ends, is characterized in that, comprising:

a handle, arranged at the proximal end;

a sheath, disposed at the distal end, the sheath is tubular, a window is formed on the side wall of the sheath, and the wire is used to pass through the sheath from the window;

a cutting member, secured in the sheath, including a distally facing cutting edge for cutting the wire; and

The slider is arranged in the sheath, the wire in the sheath is connected with the slider, and the slider can drive the wire relative to the sheath under the control of the handle Slide proximally so that the wire contacts the cutting edge.
The thread cutting device according to claim 1, wherein the sheath includes an opening formed at the distal end thereof, the slider is formed with a channel, and the wire is used to pass through the opening, the channel and the window, both ends of the wire body are used to extend out of the sheath.
The thread cutting device according to claim 2, wherein the slider comprises a main body, the channel is formed on the main body, and the channel comprises a first threading opening and a second threading hole formed on the outer wall of the main body The first threading port is communicated with the second threading port, the first threading port is provided corresponding to the opening, and the second threading port is provided corresponding to the window.
The thread cutting device according to claim 3, wherein the proximal edge of the second threading port is relative to the proximal end of the window in a state where the slider does not slide toward the proximal end relative to the sheath. The edge is closer to the distal end.
The thread cutting device according to claim 3 or 4, wherein the portion of the first threading opening facing the distal end is disposed corresponding to the side of the opening away from the window.
The thread cutting device according to any one of claims 3-5, wherein the channel further comprises a communication cavity connected between the first threading port and the second connection port, and the communication cavity is connected to the The axes of the body form two complementary angles, wherein the angle towards the proximal end is in the range of 20° to 70°.
The thread cutting device according to any one of claims 1-6, wherein the distal end surface of the sliding block is a curved surface that protrudes toward the distal end, and when the sliding block is not close to the sheath In the state where the end slides, the distal end surface of the slider protrudes beyond the distal end of the sheath.
The thread cutting device according to claim 2, wherein the slider comprises a main body for forming the channel, the main body is further formed with an axially extending receiving groove, and the proximal end of the receiving groove penetrates through The proximal end surface of the main body, the distal end of the receiving groove extends and communicates with the channel, the cutting member is received in the receiving groove, and the slider is axially relative to the sheath. During the movement, the cutting element slides in the receiving groove. During the axial movement of the slider to the proximal limit position, the cutting edge slides through the channel until it abuts the receiving groove. the far end of the slot.
The thread cutting device according to claim 8, wherein the cutting device further comprises a flexible member and a flexible conduit, the flexible member is penetrated through the conduit, and the conduit is connected between the handle and the conduit. Between the sheaths, the handle includes an operating member that can move in the axial direction, the proximal end of the flexible member is connected to the operating member, the distal end of the flexible member is connected to the slider, and the operating member can drive The flexible member pulls the slider to move proximally.
The thread cutting device according to claim 9, wherein the slider comprises a connecting piece connected to the main body, the main body is formed with an accommodating hole communicating with the accommodating groove, and the connecting piece is accommodated in the In the accommodating hole, the flexible member passes through the accommodating groove from the proximal end and is fixed to the connecting member.
The thread cutting device according to claim 10, wherein the distal end of the flexible member is sleeved on the connecting member.
The thread cutting device according to claim 11, wherein the flexible member includes two end portions and a middle section between the two end portions, the middle section includes a portion sleeved on the connecting member, One of the two end portions is fixed to the middle section in the sheath, and the other end portion is connected to the operating member; or, the two end portions are both connected to the operating member.
The thread cutting device according to any one of claims 10 to 12, characterized in that in a state that the sliding block does not slide toward the proximal end relative to the sheath, the proximal end of the cutting member is in the receiving The groove abuts against the distal end of the connector.
The thread cutting device according to any one of claims 1-13, wherein the thread cutting device further comprises a first elastic member accommodated in the sheath, and a distal end of the first elastic member abuts against The proximal end of the slider and the proximal end of the first elastic member abut against the inner wall of the proximal end of the sheath.
The thread cutting device according to any one of claims 9 to 14, wherein the handle comprises a casing, and the wall of the casing is formed with a first chute penetrating into the inner cavity and extending in the axial direction, so The operating member includes a main shaft and a handle, the main shaft is accommodated in the casing and connected to the flexible member, the handle is connected to the side surface of the main shaft, and extends out of the casing through the first chute.
The thread cutting device according to claim 15, wherein during the thread cutting process, the displacement of the pull handle relative to the housing is greater than the displacement of the cutting member relative to the sheath.
The thread cutting device according to claim 15 or 16, wherein the casing is formed with a second chute penetrating into the inner cavity thereof, and the handle comprises a safety switch inserted in the second chute, The safety switch includes a top portion and a locking portion that are connected to each other, the top portion is exposed outside the housing, the locking portion is protruding from the top surface, and the main shaft is formed with a limit groove and a guide chute that communicate with each other. , the guide groove extends in the axial direction, and the limit groove extends in the direction perpendicular to the axial direction;

When the top part slides to the first position along the second chute, the locking part is accommodated in the guide chute, or is located in the extending direction of the guide chute, and the handle can drive the the main shaft, the flexible member and the slider move proximally;

When the top portion slides to the second position along the second sliding groove, the locking portion is accommodated in the limiting groove, and the position of the operating member in the axial direction is locked.
The thread cutting device according to any one of claims 9-14, wherein the handle comprises a casing and a second elastic member accommodated in the casing, the proximal end of the second elastic member abuts against the the inner wall of the proximal end of the housing, and the distal end of the second elastic member abuts the proximal end of the operating member.