Tangential device

Abstract

The application discloses a thread cutting device, which comprises a pipe body, a transmission assembly, a cutter head and a driving assembly. The distal end of the pipe body is provided with a threading channel for the wire body to pass through, and the threading channel passes through the inner cavity of the pipe body. The transmission assembly is arranged in the inner cavity of the pipe body. The cutter head is arranged at the distal end of the transmission assembly and is used for moving in the inner cavity of the pipe body and cutting the wire body in the threading channel. Under the driving action of the driving assembly, the transmission assembly can rotate around the axial direction of the transmission assembly relative to the pipe body and move along the axial direction of the transmission assembly relative to the pipe body, so as to drive the cutter head to move along the axial direction of the transmission assembly to approach or move away from the wire body. The thread cutting device can make the cutter head realize axial thrust cutting and axial rotation cutting around the transmission assembly at the same time, which is beneficial to overcoming the transmission and consumption of the axial torque of the transmission assembly during the movement of the transmission assembly in the body conveying channel, and greatly improves the thread cutting efficiency and success rate of the thread cutting device.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a tangent device. Background Technology

[0002] Interventional surgery is a relatively new surgical procedure that utilizes minimally invasive instruments under imaging guidance. Common procedures include cardiac interventional surgery and oncology interventional surgery. In interventional surgery, a suture device is typically used to cut the sutures implanted in the patient's body. Traditional suture devices use a drive shaft to propel the cutting head axially. However, directly driving the drive shaft to move the cutting head axially is inefficient, easily causing bends in the delivery channel. Furthermore, the axial torque transmission efficiency of the drive shaft is significantly reduced at these bends. The larger the bend angle, the lower the axial torque transmission efficiency, resulting in low cutting efficiency and low success rate, which fails to meet the actual needs of users. Summary of the Invention

[0003] Therefore, it is necessary to provide a tangent device with high tangent efficiency and success rate.

[0004] A tangent device, comprising:

[0005] The tube body has a threading channel at its distal end for the thread to pass through, the threading channel passing through the inner cavity of the tube body;

[0006] A transmission assembly, which passes through the inner cavity of the tube body;

[0007] A cutting head, disposed at the distal end of the transmission assembly, is used to move within the inner cavity of the tube and cut the thread in the threading channel; and

[0008] A drive assembly is connected to the transmission assembly. Under the driving action of the drive assembly, the transmission assembly can rotate relative to the tube body around the axis of the transmission assembly while moving relative to the tube body along the axis of the transmission assembly, thereby driving the cutter head to move closer to or away from the wire body along the axis of the transmission assembly.

[0009] As can be seen from the above technical solutions, the embodiments of the present invention have at least the following advantages and positive effects:

[0010] When the wire cutting device provided in this application is used, the wire to be cut is first passed through the wire passage of the tube. Then, under the driving action of the drive component, the transmission component can rotate relative to the tube about the axis of the transmission component and in a first direction, while moving relative to the tube along the axis of the transmission component. This drives the cutter head to approach the wire along the axis of the transmission component, thereby enabling the cutter head to cut the wire. After the cutter head has finished cutting the wire, under the driving action of the drive component, the transmission component can rotate relative to the tube about the axis of the transmission component and in a second direction opposite to the first direction, while moving relative to the tube along the axis of the transmission component in the opposite direction. This drives the cutter head away from the wire along the axis of the transmission component for reuse of the wire cutting device. At the same time, it prevents one end of the wire from being clamped between the cutter head and the inner wall of the tube after the cutter head cuts the wire. Compared to the traditional cutting device where the cutter head advances and cuts along the axial direction of the transmission assembly, the cutting device of this application, by coupling the rotational motion of the transmission assembly relative to the tube body around the axial direction of the transmission assembly, and the axial movement of the transmission assembly relative to the tube body along the axial direction of the transmission assembly, enables the cutter head to simultaneously perform axial advance cutting along the transmission assembly and axial rotation cutting around the transmission assembly. This helps to overcome the axial torque transmission loss during the movement of the transmission assembly in the internal conveying channel, and eliminates the need to consider the axial torque loss of the transmission assembly when it passes through the bends in the internal conveying channel, greatly improving the cutting efficiency and success rate of the cutting device. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the tangent device in one embodiment;

[0013] Figure 2 for Figure 1 A partial structural schematic diagram of the tangent device is shown;

[0014] Figure 3 for Figure 1 A partial structural cross-sectional view of the tangent device shown;

[0015] Figure 4 for Figure 1 The exploded view of a partial structure of the tangent device shown;

[0016] Figure 5 for Figure 3 Enlarged view of point A in the middle;

[0017] Figure 6 for Figure 1 A schematic diagram of the third transmission component of the tangential device shown;

[0018] Figure 7 for Figure 1 The diagram shows the structure of the tangential device after the combination of the locking mechanism and the elastic element.

[0019] The annotations in the attached figures are explained as follows:

[0020] 10. Tangent device; 20. Thread body;

[0021] 100. Tube body; 200. Transmission assembly; 300. Cutting head; 400. Housing; 500. Drive assembly; 600. First fixing head; 700. Second fixing head; 800. Locking assembly; 900. Locking element;

[0022] 101. Threading channel; 201. Motion conversion structure; 202. First threaded part; 203. Second threaded part; 110. First outer tube; 120. Second outer tube; 111. Cable routing cavity; 112. First opening; 113. Second opening; 210. First transmission component; 220. Second transmission component; 410. First housing; 420. Second housing; 510. Third transmission component; 520. Knob; 610. First hollow cavity; 710. Second hollow cavity; 730. Fastener; 512. First fixing hole; 720. Second fixing hole; 820. Lock; 810. Lock switch; 821. Main body; 822. Pawl; 430. Through groove; 532. Locking hole; 534. Racket tooth; 830. Elastic element; 823. First mounting groove; 824. Second mounting groove; 910. Connector. Detailed Implementation

[0023] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0024] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] like Figure 1 As shown, this application provides a suture cutting device 10, which can be used to cut sutures 20 implanted into the patient's body during interventional surgery. Figure 2 The suture 20 can be a suture, a wire, or other suture. In addition, the suture cutting device 10 can also be used to cut the suture 20 on the patient's body surface.

[0028] like Figure 2 and Figure 3 As shown, the wire cutting device 10 includes a tube body 100, a transmission assembly 200, a cutting head 300, and a drive assembly 500. The distal end of the tube body 100 is provided with a threading channel 101 for the wire body 20 to pass through, and the threading channel 101 passes through the inner cavity of the tube body 100. The transmission assembly 200 passes through the inner cavity of the tube body 100. The cutting head 300 is provided at the distal end of the transmission assembly 200 and is used to move in the inner cavity of the tube body 100 and cut the wire body 20 in the threading channel 101.

[0029] The drive assembly 500 is connected to the transmission assembly 200. Under the driving action of the drive assembly 500, the transmission assembly 200 can rotate relative to the tube 100 around the axis of the transmission assembly 200 and move relative to the tube 100 along the axis of the transmission assembly 200, thereby driving the cutter head 300 to move closer to or away from the line body 20 along the axis of the transmission assembly 200.

[0030] When using the wire cutting device 10 provided in this application, the wire 20 to be cut is first passed through the wire passage 101 of the tube 100. Then, under the driving action of the drive assembly 500, the transmission assembly 200 can rotate relative to the tube 100 around the axis of the transmission assembly 200 and along the first direction, while also moving relative to the tube 100 along the axis of the transmission assembly 200. This drives the cutter head 300 to approach the wire 20 along the axis of the transmission assembly 200, thereby enabling the cutter head 300 to cut the wire 20. When the cutter head 300 finishes cutting the wire... After the wire 20 is cut, under the driving action of the drive assembly 500, the transmission assembly 200 can rotate relative to the tube 100 around the axis of the transmission assembly 200 and in a second direction opposite to the first direction, while moving in the opposite direction relative to the tube 100 along the axis of the transmission assembly 200, thereby driving the cutter head 300 away from the wire 20 along the axis of the transmission assembly 200 for reuse by the wire cutting device 10, while preventing one end of the wire 20 from being clamped between the cutter head 300 and the inner wall of the tube 100 after the cutter head 300 cuts the wire 20. Compared to the traditional cutting device where the cutter head advances and cuts along the axial direction of the transmission assembly, the cutting device 10 of this application, by coupling the rotational movement of the transmission assembly 200 relative to the tube 100 around the axial direction of the transmission assembly 200, and the movement of the transmission assembly 200 relative to the tube 100 along the axial direction of the transmission assembly 200, enables the cutter head 300 to simultaneously perform axial advance cutting along the axial direction of the transmission assembly 200 and axial rotation cutting around the transmission assembly 200. This helps to overcome the axial torque transmission loss during the movement of the transmission assembly 200 in the internal conveying channel, and eliminates the need to consider the axial torque loss of the transmission assembly 200 when it passes through the bends in the internal conveying channel, greatly improving the cutting efficiency and success rate of the cutting device 10.

[0031] For ease of understanding, in this embodiment, the first direction is defined as the clockwise direction when looking from the proximal end (the end away from the cutter head 300) of the transmission assembly 200 to the distal end (the end connected to the cutter head 300), and the second direction is the counterclockwise direction when looking from the proximal end of the transmission assembly 200 to the distal end of the transmission assembly 200.

[0032] Furthermore, the tangent device 10 also includes a motion conversion structure 201, which is disposed on the side where the tube body 100 and the transmission assembly 200 face each other. The transmission assembly 200 includes a steel cable. The motion conversion structure 201 is used to convert the rotational motion of the transmission assembly 200 relative to the tube body 100 about the axis of the transmission assembly 200 into a combination of the rotational motion of the transmission assembly 200 relative to the tube body 100 about the axis of the transmission assembly 200 and the movement of the transmission assembly 200 relative to the tube body 100 along the axis of the transmission assembly 200.

[0033] The motion conversion structure 201 includes a first threaded portion 202 and a second threaded portion 203. The first threaded portion 202 is disposed on the inner side wall of the tube body 100, and the second threaded portion 203 is disposed on the outer side wall of the transmission assembly 200. The first threaded portion 202 and the second threaded portion 203 are screwed together.

[0034] like Figure 2 As shown, the tube body 100 includes a first outer tube 110 and a second outer tube 120. The second outer tube 120 is disposed near the proximal end of the first outer tube 110. Specifically, the second outer tube 120 passes through the proximal end of the first outer tube 110. A wire-passing channel 101 is provided at the distal end of the first outer tube 110. A transmission assembly 200 passes through the first outer tube 110 and the second outer tube 120. A motion conversion structure 201 is disposed on the side where the first outer tube 110 and the transmission assembly 200 face each other. Specifically, the first outer tube 110 can be a metal tube. The first outer tube 110 and the second outer tube 120 are fixed together by welding. A first threaded portion 202 is provided on the inner sidewall of the first outer tube 110.

[0035] In one embodiment, the second outer tube 120 is a steel cable to improve its strength. It is understood that in other embodiments, the second outer tube 120 may also be a sodium hydroxide tube or made of a polymer material.

[0036] The tube body 100 also includes a smooth outer tube, which is sleeved outside the second outer tube 120 to reduce friction between the second outer tube 120 and the delivery catheter used to house and deliver the tangential device 10 to the patient. In one embodiment, the smooth outer tube may be a Pebax tube, which is thermally fused to the outside of the second outer tube 120.

[0037] A cable routing cavity 111 is provided inside the distal end of the first outer tube 110. The distal end of the first outer tube 110 is also provided with a first opening 112 and a second opening 113 that communicate with the cable routing cavity 111. The first opening 112, the second opening 113, and the cable routing cavity 111 together form a cable passage 101. The cable 20 can extend into the cable routing cavity 111 through the first opening 112 and then extend out of the cable routing cavity 111 through the second opening 113. The shapes of the first opening 112 and the second opening 113 can be circular, semi-circular, or other regular or irregular shapes.

[0038] The first opening 112 is provided on the far end face of the first outer tube 110, so that the first outer tube 110 can be pushed along the line 20 to the position of the line to be cut.

[0039] Furthermore, the position of the first opening 112 relative to the distal end face of the first outer tube 110 is adjustable to adjust the routing angle of the wire 20 at the front end of the cutter head 300, thereby facilitating the cutting of the wire 20 by the cutter head 300. Specifically, the first opening 112 is located near the bottom of the distal end face of the first outer tube 110, that is, the first opening 112 and the second opening 113 are arranged opposite each other.

[0040] like Figure 2 As shown, the transmission assembly 200 includes a first transmission member 210 and a second transmission member 220 connected to each other. The second transmission member 220 is a steel cable. The first transmission member 210 and the second transmission member 220 pass through the tube body 100. The cutter head 300 is located at the distal end of the first transmission member 210. The motion conversion structure 201 is located on the side of the tube body 100 and the first transmission member 210 facing each other. Specifically, the cutter head 300, the first transmission member 210, and the second transmission member 220 can be fixed together by welding, bonding, snap-fitting, or interference fit.

[0041] In this embodiment, the second transmission member 220 in the form of a steel cable has good bending performance, so that the circumferential torque of the second transmission member 220 in the form of a steel cable can be quickly transmitted to the cutter head 300, thereby improving the cutting efficiency and success rate of the wire cutting device 10. At the same time, during the process of the transmission assembly 200 driving the cutter head 300 to move towards the wire body 20 to cut the wire body 20, the axial length of the second transmission member 220 in the form of a steel cable is stretched and lengthened under the pulling action of the first transmission member 210. During the process of the cutter head 300 retracting, the axial length of the second transmission member 220 in the form of a steel cable is retracted. Therefore, the second transmission member 220 in the form of a steel cable can also make the second transmission member 220 have better resilience in the axial direction, avoiding irreversible deformation of the second transmission member 220.

[0042] Specifically, the first transmission member 210 can be a threaded solid push rod, which can be designed to be thinner than a hollow tube transmission member of the same strength. A second threaded portion 203 is provided on the outer wall of the first transmission member 210. The second transmission member 220 is sleeved on the proximal end of the first transmission member 210.

[0043] In one embodiment, the cutter head 300 is a hollow tubular structure with a smaller radial dimension compared to a cutting component in the form of a blade.

[0044] The distal end of the cutter head 300 is provided with a cutting edge, which has a sharp edge and is used to contact and cut the wire body 20.

[0045] In some embodiments, the outer surface of the cutting edge of the blade 300 is provided with an anti-corrosion coating to prevent the cutting edge from being corroded by the patient's bodily fluids during the delivery of the blade 300, which helps to reduce the number of cuts and improve the cutting success rate of the suture cutting device 10.

[0046] like Figure 3 As shown, the tangent device 10 also includes a housing 400, which is fitted onto the proximal end of the tube 100. The proximal end of the transmission assembly 200 is disposed within the housing 400, and the drive assembly 500 is disposed within the housing 400. Specifically, the proximal ends of the second outer tube 120 and the second transmission member 220 extend into the housing 400 through the proximal end of the housing 400.

[0047] like Figure 4 As shown, the housing 400 includes a first housing 410 and a second housing 420 that are connected to each other, and the first housing 410 and the second housing 420 are fastened to each other to facilitate the assembly of the housing 400.

[0048] like Figure 3 and Figure 4 As shown, the cutting device 10 also includes a third transmission member 510, the distal end of which is connected to the proximal end of the second transmission member 220. The drive assembly 500 includes a knob 520, which is sleeved on the proximal end of the third transmission member 510. The knob 520 is used to drive the third transmission member 510 to rotate about its axial direction, thereby causing the transmission assembly 200 to rotate relative to the tube 100 about its axial direction and move relative to the tube 100 along its axial direction, thus causing the cutter head 300 to move closer to or further away from the wire body 20 along its axial direction. Specifically, the knob 520 is used by the operator to perform a circumferential rotation operation to drive the transmission assembly 200 to rotate relative to the tube 100 about its axial direction.

[0049] like Figure 4 and Figure 5As shown, the tangent device 10 also includes a first fixing head 600 and a second fixing head 700. Both the first fixing head 600 and the second fixing head 700 are disposed inside the housing 400. The first fixing head 600 is used to fix the tube body 100 inside the housing 400. The second fixing head 700 is located near the first fixing head 600. The third transmission member 510 is connected to the transmission assembly 200 through the second fixing head 700.

[0050] Specifically, in this embodiment, the first fixing head 600 may be, but is not limited to, a cuboid structure. The first fixing head 600 is clamped and fixed inside the outer shell 400. The first fixing head 600 has a first hollow cavity 610, which extends through the proximal and distal ends of the first fixing head 600. The proximal end of the second outer tube 120 of the tube body 100 is fixedly inserted into the first hollow cavity 610 of the first fixing head 600. Optionally, the second outer tube 120 may be fixed to the first hollow cavity 610 of the first fixing head 600 by welding or bonding.

[0051] The second fixing head 700 may be, but is not limited to, a hollow cylindrical structure. The second fixing head 700 has a second hollow cavity 710 that extends through both its proximal and distal ends. The proximal end of the second transmission member 220 of the transmission assembly 200 is fixedly inserted into the second hollow cavity 710 of the second fixing head 700 to achieve connection between the transmission assembly 200 and the second fixing head 700. Optionally, the second transmission member 220 may be fixed to the second hollow cavity 710 of the second fixing head 700 by welding or bonding.

[0052] The connection position between the third transmission component 510 and the second fixed head 700 is adjustable along the axial direction of the transmission assembly 200, so as to flexibly adjust the position of the second fixed head 700 and the cutter head 300 in the axial direction of the transmission assembly 200 according to the axial length of the transmission assembly 200.

[0053] like Figures 5 to 6 As shown, the tangent device 10 also includes a fastener 730. The third transmission member 510 is sleeved on the outside of the second fixing head 700. The side wall of the third transmission member 510 is provided with a first fixing hole 512. The side wall of the second fixing head 700 is provided with at least one second fixing hole 720 spaced along the axial direction of the transmission assembly 200. The fastener 730 can be a threaded fastener. The fastener 730 can pass through the first fixing hole 512 and the second fixing hole 720 to fix the third transmission member 51 to the second fixing head 700.

[0054] Furthermore, the side wall of the second fixing head 700 is provided with a plurality of second fixing holes 720 spaced apart along the axial direction of the transmission assembly 200. The fastener 730 can pass through the first fixing hole 512 and the second fixing holes 720 at different positions to adjust and lock the connection position between the third transmission member 51 and the second fixing head 700 along the axial direction of the transmission assembly 200.

[0055] Initially, the third transmission member 510 and the second fixed head 700 are locked together by fasteners 730. When it is necessary to adjust the connection position of the third transmission member 510 and the second fixed head 700 along the axial direction of the transmission assembly 200, the fasteners 730 are moved out from the first fixing hole 512 and the second fixing hole 720 to release the lock between the fasteners 730 and the third transmission member 510 and the second fixed head 700. Then, the second fixed head 700 is driven to move relative to the third transmission member 510 to adjust the connection position of the third transmission member 510 and the second fixed head 700 along the axial direction of the transmission assembly 200. After the third transmission member 510 and the second fixing head 700 are adjusted to the required position along the axial direction of the transmission assembly 200, the fastener 730 is passed through the first fixing hole 512 and the corresponding second fixing hole 720 to lock the connection position of the third transmission member 510 and the second fixing head 700 along the axial direction of the transmission assembly 200. This allows the cutter head 300 to be positioned close to the wire passage 101 when the knob 520 of the drive assembly 500 is not rotated initially, which helps to reduce the number of rotations of the knob 520.

[0056] It should be noted that the multiple second fixing holes 720 provided on the side wall of the second fixing head 700 can also ensure that the steel cable is in a taut state during assembly. The taut steel cable is more conducive to overcoming the axial torque transmission loss during the movement of the transmission component 200 in the internal conveying channel, greatly improving the cutting efficiency and success rate of the cutting device 10. It should be noted that "multiple" as used in this application refers to two or more. It can be understood that in other embodiments, the number of second fixing holes 720 may also be one.

[0057] like Figure 3As shown, the cutting device 10 also includes a locking component 800, which has a locked state and an unlocked state. When the locking component 800 is in the locked state, it can prevent the third transmission member 510 from rotating around its own axial direction and in one direction or two opposite directions, so that the transmission component 200 can only drive the cutter head 300 to approach the wire body 20 along the axial direction of the transmission component 200, or restrict the movement of the transmission component 200 together with the cutter head 300 to remain relatively fixed to the tube body 100. When the locking component 800 is in the unlocked state, the third transmission member 510 can rotate around its own axial direction and in two opposite directions, so that the transmission component 200 can drive the cutter head 300 to approach or move away from the wire body 20 along the axial direction of the transmission component 200.

[0058] Specifically, when the locking component 800 is in the locked state, the locking component 800 can prevent the third transmission member 510 from rotating around its own axial direction and along the second direction / or the first direction and the second direction, so that the third transmission member 510 and the transmission component 200 can only rotate unidirectionally along the first direction or their movement is restricted and they cannot rotate, so that the transmission component 200 can only drive the cutter head 300 to approach the line body 20 along the axial direction of the transmission component 200, or so that the movement of the transmission component 200 together with the cutter head 300 is restricted and kept relatively fixed with respect to the tube body 100.

[0059] When the locking component 800 is in the unlocked state, the third transmission component 510 can rotate around its own axis and along the first and second directions. Thus, the transmission component 200 can also rotate freely along the first and second directions under the drive of the third transmission component 510, thereby enabling the transmission component 200 to drive the cutter head 300 to move closer to or away from the line body 20 along the axis of the transmission component 200.

[0060] like Figure 3 , Figures 5 to 7 As shown, in one embodiment, a ratchet 530 is provided circumferentially on the third transmission member 510. The ratchet 530 is provided with a plurality of clasp holes 532 spaced apart circumferentially on the ratchet 530. A through groove 430 is provided on the side wall of the housing 400. The locking assembly 800 includes a latch 820 and a latch switch 810. The latch 820 is disposed inside the housing 400. The latch 820 includes a main body 821 and a pawl 822 connected to the main body 821. The latch switch 810 extends into the housing 400 through the through groove 430 and is connected to the main body 821. The latch switch 810 can drive the latch 820 to move synchronously relative to the housing 400 along the axial direction of the transmission assembly 200.

[0061] When the locking assembly 800 is in the locked state, the pawl 822 engages with at least one locking hole 532, preventing the third transmission member 510 from rotating about its own axis and in one direction, so that the transmission assembly 200 can only drive the cutter head 300 to approach the line body 20 along the axis of the transmission assembly 200. When the locking assembly 800 is in the unlocked state, the pawl 822 disengages from the locking hole 532, and the third transmission member 510 can rotate about its own axis and in two opposite directions, so that the transmission assembly 200 can drive the cutter head 300 to approach or move away from the line body 20 along the axis of the transmission assembly 200.

[0062] Initially, the latch switch 810 is located at one end of the through slot 430, and the pawl 822 of the latch 820 is engaged with the locking hole 532 on the ratchet 530 of the third transmission member 510. The locking component 800 is in a locked state. The locking component 800 can prevent the third transmission member 510 from rotating around its own axis and in the second direction. At this time, the operator can turn the knob 520 in the first direction to drive the third transmission member 510 to rotate around its own axis and in the first direction, thereby driving the transmission component 200 to rotate relative to the tube body 100 around the axis of the transmission component 200 and in the first direction. This, in turn, drives the cutter head 300 to approach the line body 20 along the axis of the transmission component 200, so as to realize the cutting of the cutter head 300 along the axis of the transmission component 200 and the cutting of the rotation around the axis of the transmission component 200.

[0063] When the cutter head 300 needs to be retracted, the locking switch 810 can be driven to move along the axial direction of the transmission assembly 200 and toward the other end of the through groove 430, so that the locking latch 820 moves synchronously within the housing 400 along the axial direction of the transmission assembly 200 and away from the ratchet 530, so that the pawl 822 of the locking latch 820 separates from the locking hole 532, thereby switching the locking assembly 800 from the locked state to the unlocked state. At this time, the third transmission member 510 can rotate around its own axial direction and along the first and second directions. At this time, the operator can rotate the knob 520 in the opposite direction along the second direction to drive the third transmission member 510 to rotate around its axial direction and along the second direction, thereby driving the transmission assembly 200 to rotate relative to the tube 100 around the axial direction of the transmission assembly 200 and along the second direction, thereby driving the cutter head 300 away from the line body 20 along the axial direction of the transmission assembly 200, thus realizing the retraction of the cutter head 300.

[0064] Furthermore, when the locking component 800 is in the unlocked state, since there is no interaction between the pawl 822 and the locking hole 532, the resistance experienced by the third transmission component 510 is minimal. At this time, the operator can also rotate the knob 520 in the first direction to drive the third transmission component 510 to rotate around the axis of the third transmission component 510 and in the first direction, thereby driving the transmission component 200 to rotate relative to the tube body 100 around the axis of the transmission component 200 and in the first direction, thereby driving the cutter head 300 to approach the line body 20 along the axis of the transmission component 200, so as to realize the cutting of the cutter head 300 along the axis of the transmission component 200 for advancing punching and rotating punching around the axis of the transmission component 200.

[0065] Therefore, through the cooperation of the pawl 822 and the locking hole 532, the operator can rotate the knob 520 in the first direction to drive the cutter head 300 to advance and cut along the axial direction of the transmission component 200 and rotate around the axial direction of the transmission component 200 when the locking component 800 is in the locked state, without having to toggle the locking switch 810 to switch the locking component 800 to the unlocked state to perform the cutting operation of the cutter head 300. In addition, when the knob 520 is rotated at an angle greater than the maximum angle that a normal person's wrist can rotate, the line 20 is still not cut, and if the operator releases his hand at this time, the second transmission component 220 in the form of a steel cable will rebound due to stress, causing the third transmission component 510 to rotate in the opposite direction in the second direction, thereby causing the cutter head 300 to retract. The locking cooperation of the pawl 822 and the locking hole 532 can prevent the third transmission component 510 from rotating in the opposite direction in the second direction, thus allowing the operator to temporarily release his hand from the knob 520 and achieve continuous rotation of the knob 520.

[0066] like Figure 6 As shown, the ratchet 530 is provided with a plurality of ratchet teeth 534 distributed circumferentially along the ratchet 530, and a locking hole 532 is formed between any two adjacent ratchet teeth 534.

[0067] It should be noted that in some embodiments, the shape of the pawl 822 can be adjusted, for example, the pawl 822 can be set as a rectangular structure, and the shape of the locking hole 532 can be adapted to the shape of the pawl 822, so that when the locking component 800 is in the locked state, that is, when the pawl 822 is engaged with the locking hole 532, the locking component 800 can prevent the third transmission member 510 from rotating about its own axial direction and in two opposite directions.

[0068] like Figure 5As shown, the locking assembly 800 also includes an elastic element 830, which is housed within the housing 400. The elastic element 830 drives the latch 820 to move within the housing 400 along the axial direction of the transmission assembly 200 and toward the ratchet 530, so that the pawl 822 engages with the locking hole 532. By providing the elastic element 830, in the natural state (i.e., without operator operation of the latch switch 810), the elastic element 830, under its own elastic force, can drive the latch 820 within the housing 400 along the axial direction of the transmission assembly 200 and toward the ratchet 530, so that the pawl 822 engages with the locking hole 532, thereby keeping the locking assembly 800 in a locked state in its natural state. Furthermore, when it is necessary to switch the state of the locking component 800 to the unlocked state, the operator overcomes the elastic force applied to the latch 820 by the elastic element 830, and the latch 820 is moved along the axis of the transmission component 200 and away from the ratchet 530 within the housing 400 by the latch switch 810, so that the pawl 822 of the latch 820 is separated from the locking hole 532.

[0069] In this embodiment, the elastic element 830 can be a compression spring. The elastic element 830 is located on the side of the main body 821 away from the pawl 822. In this case, the elastic element 830 can use its own compressive elastic restoring force to drive the latch 820 to move within the housing 400 along the axial direction of the transmission assembly 200 and towards the ratchet 530, so that the pawl 822 engages with the locking hole 532. The main body 821 of the latch 820 is also provided with a first mounting groove 823, located on the side of the main body 821 away from the pawl 822. The elastic element 830 abuts against the first mounting groove 823. In one embodiment, the length of the first mounting groove 823 is equal to the initial length of the elastic element 830, or the length of the first mounting groove 823 is less than the initial length of the elastic element 830.

[0070] Furthermore, a protrusion may be provided on the inner sidewall of the housing 400, the protrusion being used to extend to the first mounting groove 823 to abut against one end of the elastic member 830.

[0071] like Figure 7 As shown, a second mounting groove 824 is provided on the main body 821 of the latch 820, and the latch switch 810 is fixed in the second mounting groove 824. In some embodiments, the latch switch 810 can be fixed in the second mounting groove 824 by welding or bonding. Specifically, the second mounting groove 824 is provided on the top of the main body 821, and the pawl 822 is provided on the side of the main body 821. Figure 3 and Figure 4As shown, the tangent device 10 also includes a locking member 900, which is disposed near the proximal end of the third transmission member 510. The locking member 900 is used to prevent the knob 520 from dislodging from the proximal end of the third transmission member 510 during rotation. Specifically, in this embodiment, the locking member 900 is threadedly connected to the proximal end of the third transmission member 510. It can be understood that in other embodiments, the locking member 900 may be integrally formed with the third transmission member 510.

[0072] The tangent device 10 also includes a connector 910, which is located at the distal end of the housing 400. The proximal end of the tube body 100 and the proximal end of the transmission assembly 200 extend into the housing 400 via the connector 910. Specifically, the proximal end of the second outer tube 120 of the tube body 100 and the proximal end of the second transmission member 220 of the transmission assembly 200 extend into the housing 400 via the connector 910. The connector 910 is held and fixed within the distal end of the housing 400.

[0073] In one embodiment, the nozzle 910 is made of a flexible material. The nozzle 910 may be, but is not limited to, a rubber nozzle. During the use of the wire cutting device 10, there is friction and compression between the tube body 100 and the nozzle 910, which may damage the tube body 100. The flexible material nozzle 910 can effectively reduce the damage to the tube body 100.

[0074] The operation process of the above-mentioned tangent device 10 is as follows:

[0075] Step S1. Pass the thread 20 sequentially through the first opening 112, the threading cavity 111 and the second opening 113 (i.e. the threading channel 101) of the first outer tube 110. The operator holds the free end of the thread 20 with one hand and holds the outer shell 400 of the cutting device 10 with the other hand and pushes the cutting device 10 to push the cutter head 300 to move along the thread 20 to the point where the thread 20 needs to be cut.

[0076] Step S2. Initially, the latch switch 810 is located at one end of the through groove 430, and the pawl 822 of the latch 820 is engaged with the locking hole 532 on the ratchet 530 of the third transmission component 510. The locking component 800 is in the locked state. At this time, the operator can hold the housing 400 of the wire cutting device 10 with his bare hand and use the thumb of the hand holding the housing 400 to hold the latch switch 810 to drive the latch switch 810 to move along the axial direction of the transmission component 200 and toward the other end of the through groove 430, so as to drive the latch 820 to move synchronously within the housing 400 along the axial direction of the transmission component 200 and away from the ratchet 530, so that the pawl 822 of the latch 820 is separated from the locking hole 532, thereby switching the locking component 800 from the locked state to the unlocked state. Alternatively, the operator can also leave the latch switch 810 unoperated to keep the locking component 800 in the locked state. When the locking component 800 is in the locked or unlocked state, the operator can manually rotate the knob 520 in the first direction to drive the third transmission component 510 to rotate around the axis of the third transmission component 510 and in the first direction. This will drive the transmission component 200 to rotate relative to the tube body 100 around the axis of the transmission component 200 and in the first direction. This will then drive the cutter head 300 to approach the line body 20 along the axis of the transmission component 200, so as to realize the cutting head 300 advancing and cutting along the axis of the transmission component 200 and rotating and cutting around the axis of the transmission component 200.

[0077] Step S3. Since the operator's wrist rotation angle is limited, the operator can release the locking switch 810 at this time. As the elastic element 830 elastically resets at this time, the elastic element 830 can drive the locking buckle 820 to move along the axis of the transmission assembly 200 and toward the ratchet 530 within the housing 400 under its own elastic force, so that the pawl 822 is engaged with the locking hole 532. At this time, the third transmission element 510 remains fixed in this position, preventing the cutter head 300 from retracting due to the reverse rotation of the third transmission element 510 in the second direction caused by the rebound of the second transmission element 220 in the form of a steel cable.

[0078] Step S4. Repeat steps S2 and S3 until the cutter head 300 cuts the wire 20.

[0079] Step S5. When it is necessary to retract the cutter head 300, the locking switch 810 can be driven to move along the axial direction of the transmission assembly 200 and toward the other end of the through groove 430, so as to drive the locking latch 820 to move synchronously within the housing 400 along the axial direction of the transmission assembly 200 and away from the ratchet 530, so that the pawl 822 of the locking latch 820 separates from the locking hole 532, thereby switching the locking assembly 800 from the locked state to the unlocked state. At this time, the third transmission member 510 can rotate around its own axial direction and along the first and second directions. At this time, the operator can rotate the knob 520 in the opposite direction along the second direction to drive the third transmission member 510 to rotate around its axial direction and along the second direction, thereby driving the transmission assembly 200 to rotate relative to the tube 100 around the axial direction of the transmission assembly 200 and along the second direction, thereby driving the cutter head 300 away from the line body 20 along the axial direction of the transmission assembly 200, thus realizing the retraction of the cutter head 300.

[0080] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A tangent device, characterized in that, include: The tube body has a threading channel at its distal end for the thread to pass through, the threading channel passing through the inner cavity of the tube body; A transmission assembly is disposed within the inner cavity of the tube body; the transmission assembly includes a first transmission component and a second transmission component connected to each other, the second transmission component being a flexible steel cable. A cutting head is disposed at the distal end of the first transmission member, and the cutting head is used to move in the inner cavity of the tube and cut the wire in the threading channel; as well as A drive assembly is connected to the transmission assembly. Under the driving action of the drive assembly, the transmission assembly can rotate relative to the tube body around the axis of the transmission assembly while moving relative to the tube body along the axis of the transmission assembly, thereby driving the cutter head to move closer to or away from the wire body along the axis of the transmission assembly. The tangent device further includes a housing, a third transmission component, and a locking assembly. The housing is fitted onto the proximal end of the tube body, the proximal end of the transmission assembly is disposed within the housing, and the driving assembly is disposed within the housing. The distal end of the third transmission component is connected to the proximal end of the second transmission component. The driving assembly includes a knob fitted onto the proximal end of the third transmission component. The knob is used to drive the third transmission component to rotate around its axial direction, thereby driving the transmission assembly to rotate relative to the tube body around its axial direction. The locking assembly includes a ratchet and a pawl, the ratchet being disposed in the circumferential direction of the third transmission member, and the pawl being movably disposed within the housing; The locking component has a locked state and an unlocked state. When the locking component is in the locked state, the pawl engages with the ratchet, and the locking component allows the third transmission member to rotate about its own axis in a first direction, while preventing the third transmission member from rotating about its own axis in a second direction opposite to the first direction. This allows the transmission component to drive the cutter head to approach the cable along the axis of the transmission component and prevents the cutter head from moving away from the cable along the axis of the transmission component due to the springback stress of the flexible steel cable. When the locking component is in the unlocked state, the pawl disengages from the ratchet, and the third transmission member can rotate about its own axis in two opposite directions. This allows the transmission component to drive the cutter head to approach or move away from the cable along the axis of the transmission component.

2. The tangent device according to claim 1, characterized in that, The tangent device further includes a motion conversion structure, which is disposed on the side where the tube body and the transmission assembly face each other. The motion conversion structure is used to convert the rotational motion of the transmission assembly relative to the tube body about the axis of the transmission assembly into a combination of the rotational motion of the transmission assembly relative to the tube body about the axis of the transmission assembly and the axial movement of the transmission assembly relative to the tube body along the axis of the transmission assembly.

3. The tangent device according to claim 2, characterized in that, The motion conversion structure includes a first threaded portion and a second threaded portion. The first threaded portion is disposed on the inner side wall of the tube body, and the second threaded portion is disposed on the outer side wall of the transmission assembly. The first threaded portion and the second threaded portion are screwed together.

4. The tangent device according to claim 2, characterized in that, The tube body includes a first outer tube and a second outer tube. The second outer tube is disposed at the proximal end of the first outer tube, and the far end of the first outer tube is provided with the threading channel. The transmission component is disposed inside the first outer tube and the second outer tube, and the motion conversion structure is disposed on the side where the first outer tube and the transmission component face each other.

5. The tangent device according to claim 4, characterized in that, The first outer tube has a wiring cavity at its distal end. The first outer tube also has a first opening and a second opening that communicate with the wiring cavity at its distal end. The first opening, the second opening, and the wiring cavity together constitute the wiring channel. The wire can be inserted into the wiring cavity through the first opening and then extended out of the wiring cavity through the second opening.

6. The tangent device according to claim 2, characterized in that, The motion conversion structure is located on the side where the tube body and the first transmission component face each other.

7. The tangent device according to claim 1, characterized in that, The ratchet is provided with a plurality of circumferentially spaced locking holes, and the side wall of the housing is provided with a through groove. The locking assembly includes a latch and a latch switch. The latch is disposed inside the housing and includes a main body and a pawl connected to the main body. The latch switch extends into the housing through the through groove and is connected to the main body. The latch switch can drive the latch to move synchronously relative to the housing along the axial direction of the transmission assembly. When the locking component is in the locked state, the pawl engages with at least one of the locking holes, and the locking component can prevent the third transmission member from rotating about its own axis and in one direction, so that the transmission component can only drive the cutter head to approach the line body along the axis of the transmission component. When the locking component is in the unlocked state, the pawl separates from the locking hole, and the third transmission component can rotate around its own axis and in two opposite directions, so that the transmission component can drive the cutter head to move closer to or away from the line along the axis of the transmission component.

8. The tangent device according to claim 7, characterized in that, The ratchet is provided with a plurality of ratchet teeth that are spaced apart circumferentially along the ratchet, and a locking hole is formed between any two adjacent ratchet teeth.

9. The tangent device according to claim 7, characterized in that, The locking assembly further includes an elastic element housed within the housing. The elastic element drives the latch to move within the housing along the axial direction of the transmission assembly and toward the ratchet, so that the pawl engages with the locking hole.

10. The tangent device according to claim 9, characterized in that, The main body is also provided with a first mounting groove, which is located on the side of the main body away from the pawl, and the elastic member is held in the first mounting groove.

11. The tangent device according to claim 10, characterized in that, The inner wall of the housing is provided with a protrusion, which extends to the first mounting groove to abut against one end of the elastic member.

12. The tangent device according to claim 1, characterized in that, The distal end of the blade is provided with a cutting edge, which has a sharp edge and is used to contact and cut the wire.

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