Sheath assembly, medical wire cutting device, and medical lock and cut integrated device

Abstract

The application provides a sheath assembly, a medical incision device and a medical lock and incision integrated device. The sheath assembly comprises a sheath body and a supporting inner tube. The sheath body has a first inner cavity penetrating in the axial direction. The supporting inner tube is arranged in the first inner cavity. The supporting inner tube is spirally wound by a material around the axial direction and comprises a plurality of spiral turns arranged in the axial direction. Each spiral turn comprises two end faces oppositely arranged in the axial direction. When the supporting inner tube is in a curved state, the adjacent two end faces of the adjacent two spiral turns are in surface contact to resist each other on the inner side of the curved part of the supporting inner tube, so that the supporting inner tube can maintain a curved steady state, thereby the supporting inner tube can withstand the force when the incision line is cut, and the stable and sufficient supporting force is provided for the incision line, the possibility of the sheath assembly jumping or yawing is reduced, and the risk of tissue damage or tearing in the patient's body caused by the sheath assembly jumping or yawing is reduced.

Description

Technical Field

[0001] This application relates to the field of medical devices, specifically to a sheath assembly, a medical tangent device, and a medical locking and cutting integrated device. Background Technology

[0002] During surgery, it is often necessary to tie and fix medical sutures (including but not limited to sutures, repair sutures used as artificial tendineae, repair sutures for edge-to-edge repair of valves, etc.) and remove excess medical sutures.

[0003] Traditional surgery is performed under direct vision through an incision, with the surgeon typically tying knots manually to secure the sutures before removing excess material. With advancements in technology, minimally invasive and interventional procedures are becoming increasingly common, such as laparoscopic surgery and transcatheter interventional procedures. These procedures require only a small incision in the patient's body to insert instruments like endoscopes or interventional catheters to the intended site for treatment.

[0004] In this type of surgery, the operator usually needs to remotely operate through the small operating window outside the patient's body to lock and remove excess medical sutures.

[0005] Existing medical suture cutting devices typically include a handle, a suture cutting assembly, and a sheath. The suture cutting assembly includes a blade and a drive mechanism connected to the blade. The drive mechanism is inserted into the sheath, and the handle can be operated to pull the drive mechanism proximally to actuate the blade and cut the medical suture (such as a suture). Because it needs to be inserted into the human body, both the sheath and the drive mechanism must be flexible enough to adapt to the physiological and anatomical structure of the body's lumens. However, when the sheath is in a bent state and the drive mechanism is pulled proximally to cut the suture, the sheath's support is insufficient. Under the pulling force of the internal drive mechanism, the bent portion of the sheath may exhibit abnormal jumping or swaying, causing the distal end of the medical suture cutting device to pull on the suture, posing a risk of tearing internal tissue. Summary of the Invention

[0006] The purpose of this application is to provide a sheath assembly, a medical suture device, and a medical locking and cutting integrated device that can reduce the risk of damage or tearing of tissues in the body.

[0007] In a first aspect, this application provides a sheath assembly, including a sheath body and a supporting inner tube. The sheath body has a first inner cavity extending axially. The supporting inner tube passes through the first inner cavity. The supporting inner tube is formed by spirally winding a material around an axial direction, including a plurality of spiral coils arranged axially, each spiral coil including two end faces arranged opposite each other axially. When the supporting inner tube is in a bent state, on the inner side of the bent portion of the supporting inner tube, the adjacent end faces of two adjacent spiral coils are in surface contact to abut against each other.

[0008] Secondly, this application provides a medical tangential device, including a sheath assembly, a tangential component, and a base component as described above; the base component is connected to the distal end of the sheath assembly, the base component includes a support extending axially, and a mating component connected to the support, the mating component having a tangential surface; the tangential component includes a blade holder slidably sleeved on the support and located distal to the tangential surface, a blade fixedly connected to the blade holder, and a tangential inner core connected to the blade holder to drive the blade holder to move axially, the tangential inner core being movably inserted into the inner support tube of the sheath assembly.

[0009] Thirdly, this application provides a medical suture cutting integrated device, including a medical suture cutting device, a suture pin component, and a suture locking component as described above; the sheath body further includes a second inner cavity extending axially; the base component further includes a first base, and the distal end of the support member is fixedly connected to the first base; the suture pin component includes a suture pin body and a suture pressing component movably connected to the suture pin body, the suture pin body being detachably disposed within the first base; the suture locking component includes a push rod and a suture locking core connected to the proximal end of the push rod; the distal end of the push rod is detachably connected to the suture pin body, the suture locking core is movably disposed within the second inner cavity, and the suture locking core drives the push rod to move forward to drive the suture pressing component to move relative to the suture pin body to lock the medical suture located between the suture pressing component and the suture pin body; the medical suture cutting device is used to cut the medical suture extending from the suture pin body.

[0010] The sheath assembly, medical suture cutting device, and medical locking-cutting integrated device provided in this application, by inserting a supporting inner tube inside the sheath body, and setting the supporting inner tube to include multiple spiral coils arranged along the axial direction, each spiral coil including two end faces arranged opposite each other along the axial direction, when the sheath assembly is in a bent state, and the tangent core inserted in the supporting inner tube is pulled proximally to cut the medical suture, on the inner side of the bent part of the supporting inner tube, the adjacent end faces of two adjacent spiral coils are in surface contact and can abut and support each other, so that the supporting inner tube can maintain a bent stable state, the supporting inner tube can withstand the force of the tangent, and provide stable and sufficient support force for the tangent, ensuring the shape stability of the bent part of the supporting inner tube and the sheath assembly, reducing the possibility of the sheath assembly jumping or swinging, and reducing the risk of tissue damage or tearing in the patient's body caused by the jumping or swinging of the sheath assembly. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some implementation methods provided by the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a three-dimensional assembly schematic diagram of a medical locking and cutting integrated device provided in one embodiment of this application;

[0013] Figure 2 yes Figure 1 An axial sectional view of the medical locking and cutting integrated device shown.

[0014] Figure 3a yes Figure 1 A partial exploded three-dimensional diagram of the medical locking and cutting integrated device shown.

[0015] Figure 3b yes Figure 3a A further exploded perspective view of the medical locking and cutting integrated device shown;

[0016] Figure 4 yes Figure 1 The diagram shows a three-dimensional assembly of the medical locking and cutting integrated device with the sleeve removed from one perspective.

[0017] Figure 5 yes Figure 1 The diagram shows a three-dimensional assembly of the medical locking and cutting integrated device with the sleeve removed from another perspective.

[0018] Figure 6 This is a three-dimensional assembly diagram of the base component removing the sleeve in the medical locking and cutting integrated device;

[0019] Figure 7 This is a schematic axial cross-sectional view of the removal sleeve of the base component in the medical locking and cutting integrated device;

[0020] Figure 8 This is a partial three-dimensional exploded view of the base components;

[0021] Figure 9 , Figure 10 , Figure 11 It is a three-dimensional schematic diagram of the first matrix in the matrix component from different perspectives;

[0022] Figure 12 This is a three-dimensional assembly diagram of the locking pin component in a medical locking and cutting integrated device from one perspective;

[0023] Figure 13 This is a three-dimensional assembly diagram of the locking pin component in a medical locking and cutting integrated device from another perspective;

[0024] Figure 14 This is a three-dimensional exploded view of the locking pin component;

[0025] Figure 15 This is a three-dimensional assembly diagram of the sheath assembly (with part of the outer tube hidden);

[0026] Figure 16 This is a schematic cross-sectional view of the sheath assembly;

[0027] Figure 17 This is a three-dimensional schematic diagram of the supporting inner tube in the sheath assembly when it is in a straight state.

[0028] Figure 18 yes Figure 17 The diagram shows a cross-sectional view of the inner support tube along the axial direction.

[0029] Figure 19 This is a schematic diagram of the inner tube being supported in a bent state;

[0030] Figure 20 yes Figure 19 A schematic cross-sectional view of the curved inner support tube along the axial direction.

[0031] Figure 21 yes Figure 20 A magnified schematic diagram of a partial area of ​​the curved section of the supporting inner tube;

[0032] Figure 22 It is an axial cross-sectional view of the second base, outer tube, supporting inner tube, and connecting parts assembled together;

[0033] Figure 23 This is a three-dimensional assembly diagram of the sheath assembly and connectors;

[0034] Figure 24 and Figure 25 A schematic diagram illustrating the process of locking medical wires using a medical locking and cutting integrated device;

[0035] Figure 26 A schematic diagram of the tangent line of a medical locking and cutting integrated device;

[0036] Figure 27 This is a schematic diagram showing the separation of the locking pin component from the first base.

[0037] Figure 28 A three-dimensional schematic diagram of the medical suture after it has been fixed to the locking pin component and detached from the first substrate. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0039] Furthermore, the following descriptions of the embodiments are with reference to the accompanying illustrations, which illustrate specific embodiments in which this application can be implemented. Directional terms used in this invention, such as "up," "down," "front," "rear," "left," "right," "inner," "outer," and "side," are merely for reference to the accompanying illustrations. Therefore, the directional terms used are for better and clearer explanation and understanding of this application, and are not intended to indicate or imply that the referred device or element must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0040] Orientation Definitions: For clarity, during the procedure, the end closer to the operator is referred to as the "proximal end," and the end farther from the operator is referred to as the "distal end." "Axial" refers to the direction parallel to the line connecting the center of the distal end and the proximal end of the medical device. "Radial" refers to the direction perpendicular to or approximately perpendicular to the axial direction. "Circumferential" refers to the direction surrounding the axial direction. These definitions are for convenience only and should not be construed as limiting this application.

[0041] Please see Figure 1 One embodiment of this application provides a medical locking and cutting integrated device 100 for locking medical sutures 200 and cutting off excess medical sutures 200.

[0042] Please see Figure 2 , Figure 3a , Figure 3b , Figure 4 and Figure 5 The medical suture cutting integrated device 100 includes a medical suture cutting device 101, a locking pin component 20, and a suture locking component 30. The medical suture cutting device 101 includes a base component 10, a suture cutting component 50, and a sheath assembly 70. The locking pin component 20 is detachably mounted on the base component 10. The suture locking component 30 is detachably connected to the locking pin component 20 and is used to drive the locking pin component 20 to lock the medical suture 200. The suture cutting component 50 in the medical suture cutting device 101 is slidably connected to the base component 10 and is used to cut off excess medical suture 200 extending from the locking pin component 20. The suture cutting component 50 passes through the sheath assembly 70. The sheath assembly 70 is connected to the base component 10 to support the suture cutting component 50.

[0043] Please refer to the following: Figures 6 to 8 , combined Figures 2 to 5The base component 10 includes a first base 11, a support member 13, and a mating member 15. The distal end of the support member 13 is fixedly connected to the first base 11. The mating member 15 is disposed on the support member 13.

[0044] Please refer to the following: Figures 12 to 14 , combined Figures 2 to 5 The locking pin component 20 includes a locking pin body 21 and a pressure wire member 23 movably connected to the locking pin body 21. The locking pin body 21 is detachably disposed within the first base 11.

[0045] Please refer to the following: Figures 2 to 5 The suture locking component 30 includes a push rod 31, the distal end of which is detachably connected to the locking pin body 21, and the two have a self-locking structure 210 that cooperates with each other. The push rod 31 moves forward to drive the pressure member 23 to move relative to the locking pin body 21, thereby locking the medical suture 200 located between the pressure member 23 and the locking pin body 21. The self-locking structure 210 is used to prevent the push rod 31 from moving backward under the action of the medical suture 200. Here, "forward" refers to movement from proximal to distal, and "reverse" refers to movement from distal to proximal. During the subsequent suture cutting process, the medical suture 200 needs to be pulled proximally. The suture clamping member 23 tends to move in the opposite direction under the influence of the medical suture 200. Without the self-locking structure 210, the push rod 31 might be driven to move in the opposite direction by the suture clamping member 23, leading to a decrease in the locking force of the locking pin component 20 on the medical suture 200, or even causing the medical suture to loosen from the locking pin component and the locking pin component to fall off. It is precisely because of the self-locking structure 210 that after the push rod 31 moves forward to drive the suture clamping member 23 to move relative to the locking pin body 21 to lock the medical suture 200 located between the suture clamping member 23 and the locking pin body 21, the pulling force on the medical suture 200 during the suture cutting process is insufficient to overcome the self-locking effect of the self-locking structure 210. The push rod 31 maintains the position of locking the medical suture 200 and will not move in the opposite direction under the influence of the medical suture 200. In this embodiment, the self-locking structure 210 includes an external thread 311 (e.g., ...) located at the distal end of the push rod 31. Figure 2 and Figure 3b (as shown) and a threaded hole 211 (as shown) located near the end of the locking pin body 21 and adapted to the external thread. Figure 2 As shown in the diagram, the push rod 31 and the locking pin body 21 achieve self-locking through a threaded self-locking structure 210. Rotating the push rod 31 unlocks the connection between the push rod 31 and the locking pin body 21, while stopping the rotation of the push rod 31 establishes self-locking between the internal and external threads, making the operation simple and convenient. It can be understood that the self-locking structure 210 is not limited to a threaded connection; the push rod 31 and the locking pin body 21 can also achieve self-locking through other methods, such as a snap-fit ​​connection.

[0046] Please refer to the following: Figures 2 to 5 ,and Figure 26The tangent member 50 is slidably connected to the support member 13. The tangent member 50 is used to cooperate with the mating member 15 to cut the medical suture 200 extending from the self-locking nail body 21.

[0047] Taking the medical suture 200 as an example of a repair suture for an artificial chordae tendineae, after the suture is cut, the locking pin body 21 is easily dislodged from the first base 11 under the pull of the heartbeat. During this process, the pull of the heartbeat on the medical suture 200 is towards the distal end, and the force of the medical suture 200 on the pressure member 23 is also towards the distal end, which will make the locking pin member 20 squeeze the medical suture 200 even tighter.

[0048] Specifically, please refer to Figures 9 to 11 , combined Figures 3b to 6 The first base 11 includes a first mounting portion 111 and a second mounting portion 113 fixedly connected. The first mounting portion 111 is located at the proximal end of the first base 11. The first mounting portion 111 has an axially penetrating through groove 1111 for receiving the support member 13. The proximal end of the first mounting portion 111 has a step 1113 for engaging with the tangential member 50. In this embodiment, the step 1113 is formed by removing a portion of material radially from the proximal end of the first mounting portion 111. The second mounting portion 113 has an axially penetrating receiving groove 1131 for receiving the locking pin body 21.

[0049] Please refer to Figures 3 to 4. Figure 8 The support member 13 extends axially. The proximal end of the support member 13 is fixedly connected to the through groove 1111. The support member 13 has an axially extending through channel 131 communicating with the receiving groove 1131 for inserting the push rod 31. The through channel 131 communicates with the threaded hole 211 (e.g., ...). Figure 2 (As shown). The push rod 31 is movably inserted into the insertion channel 131. The insertion channel 131 provides limiting and guiding functions for the push rod 31.

[0050] Please refer to the following: Figures 1 to 7 The base component 10 also includes a second base 16 and a sleeve 17. The second base 16 is fixed to the proximal end of the support member 13. The mating member 15 is located between the tangential member 50 and the second base 16. The sleeve 17 is sleeved over the first base 11, the tangential member 50, the mating member 15, and the second base 16. The two ends of the sleeve 17 are respectively fixedly connected to the first base 11 and the second base 16. The second base 16 and the first base 11 jointly support the sleeve 17. The sleeve 17 is provided with a wire hole 171 for leading out the medical suture 200 extending from the locking nail body 21. The sleeve 17 is generally cylindrical. The sleeve 17 improves the uniformity and smoothness of the surface of the medical locking and cutting integrated device 100, thereby improving the smoothness of the medical locking and cutting integrated device 100 in blood vessels. In this embodiment, combined with Figures 9 to 11The outer contour of the second mounting portion 113 of the first base 11 is circular and has a large diameter to allow the distal end face of the sleeve 17 to fit. The outer contour of the distal end of the first mounting portion 111 is roughly circular, but with a slightly smaller diameter to fit with the inner wall of the sleeve 17. It is understood that the shape of the sleeve 17 is not limited.

[0051] The base component 10 also includes positioning elements 18. The mating component 15 has a first positioning hole 151, and the sleeve 17 has a second positioning hole 173 penetrating the side wall of the sleeve 17. The positioning elements 18 pass through the first positioning hole 151 and the second positioning hole 173 to fix the mating component 15 and the sleeve 17 together, thereby facilitating the assembly of the base component 10. In this embodiment, the mating component 15 has two first positioning holes 151, two second positioning holes 173, and two positioning elements 18. The two first positioning holes 151 are symmetrically arranged with respect to the axis along the same diameter of the mating component 15. It is understood that the number of positioning elements 18 in this application is not limited.

[0052] The locking pin body 21 is fitted into the receiving groove 1131 with a clearance. The clearance between the inner wall of the receiving groove 1131 and the outer wall of the locking pin body 21 is preferably [0.03, 0.15] mm, more preferably [0.06, 0.10] mm, so that the locking pin body 21 can be easily inserted into and removed from the receiving groove 1131.

[0053] Please see Figure 12 , Figure 13 , Figure 14 , combined Figures 1 to 5 The locking pin body 21 includes a first mounting portion 214 and a second mounting portion 215. The first mounting portion 214 is located at the proximal end of the locking pin body 21. In this embodiment, the first mounting portion 214 is generally frustum-shaped to facilitate the detachment of the locking pin body 21 from the first base 11. A threaded hole 211 (e.g.) Figure 13 (As shown) is located near the end of the first mounting portion 214, enabling a detachable connection between the first mounting portion 214 and the push rod 31. The first mounting portion 214 is dimensionally reduced in all directions compared to the second mounting portion 215, with "all directions" including radial and axial directions.

[0054] The second mounting portion 215 of the locking pin body 21 is fitted with the inner wall of the receiving groove 1131 with a clearance (e.g.) Figure 2 (As shown). A mutually compatible anti-rotation structure is also provided between the first base 11 and the second mounting part 215. The anti-rotation structure is used to prevent the locking nail body 21 from rotating relative to the first base 11. Therefore, when the medical locking and cutting integrated device 100 performs the locking operation, the locking nail body 21 does not rotate, and the push rod 31 rotates and moves axially relative to the locking nail body 21.

[0055] In this embodiment, the anti-rotation structure between the first base 11 and the second mounting portion 215 consists of at least one pair of mating planes. Specifically, the first base 11 has two opposing planes on the inner wall of the receiving groove 1131. The second mounting portion 215 of the locking pin body 21 includes a first outer surface 2151 (e.g., ...) that is interconnected. Figure 13 As shown), the second outer surface 2152 (as shown) Figure 13 As shown), the third outer surface 2153 (as shown) Figure 12 (as shown) and the fourth outer surface 2154 (as shown) Figure 12 (As shown). The first outer surface 2151 and the third outer surface 2153 are disposed opposite to each other, and the second outer surface 2152 and the fourth outer surface 2154 are disposed opposite to each other. The first outer surface 2151 and the third outer surface 2153 are arc surfaces, and the second outer surface 2152 and the fourth outer surface 2154 are planes. The second outer surface 2152 has a non-rotational fit with a plane in the receiving groove 1131 of the first base 11, and the fourth outer surface 2154 has a non-rotational fit with another plane in the receiving groove 1131 of the first base 11. In other words, the non-rotational structure between the first base 11 and the second mounting part 215 consists of two pairs of mating planes. It can be understood that this application does not limit the first outer surface 2151 and the third outer surface 2153 to be arc surfaces, nor does it limit the second outer surface 2152 and the fourth outer surface 2154 to be planes; the non-rotational fit between the second mounting part 215 and the inner wall of the first base 11 is sufficient. It is understood that the anti-rotation structure 216 may also include, but is not limited to, structures such as protrusions and grooves that extend axially and are mutually adapted.

[0056] The locking pin body 21 has a receiving cavity 217 for accommodating the crimping member 23. The receiving cavity 217 extends from the first mounting portion 215 to the second mounting portion 215. The receiving cavity 217 penetrates the second mounting portion 215 at its distal end opposite to the first mounting portion 214, i.e., the distal opening of the locking pin body 21, to facilitate the assembly and disassembly of the crimping member 23 and the locking pin body 21. The inner wall of the receiving cavity 217 is provided with a crimping groove 2171. The crimping groove 2171 has a bottom wall 2173. When the push rod 31 moves forward, it drives the crimping member 23 to gradually approach the bottom wall 2173 until the gap between the crimping member 23 and the bottom wall 2173 is less than the diameter of the medical suture 200, thereby locking the medical suture 200 located between the crimping member 23 and the bottom wall 2173.

[0057] The locking pin body 21 also includes a guide portion 218 provided on the side wall of the receiving cavity 217. The wire clamping member 23 is movably connected to the guide portion 218 and is movable along the guide portion 218. The guide portion 218 is used to guide the movement of the wire clamping member 23 relative to the locking pin body 21. The guide portion 218 gradually approaches the bottom wall 2173 from its proximal end to its distal end. The guide portion 218 includes a first guide portion 2181 and a second guide portion 2183. The first guide portion 2181 is located at the proximal end of the guide portion 218 and is inclined relative to the axial direction of the locking pin body 21. The second guide portion 2183 extends along the axial direction of the locking pin body 21.

[0058] The locking pin body 21 also includes a lead-out hole 219 communicating with the receiving cavity 217. The lead-out hole 219 extends from the first surface 2151 of the second mounting portion 215 to the first mounting portion 214, and is used to lead the medical thread 200 out from the receiving cavity 217. The lead-out hole 219 is inclined relative to the axial direction. The ratio between the length of the lead-out hole 219 and the length of the locking pin body 21 is preferably in the range of [1 / 3, 1 / 2], and the ratio between the width of the lead-out hole 219 and the maximum width of the locking pin body 21 is preferably in the range of [1 / 3, 1]. This arrangement of the lead-out hole 219 minimizes the weight and volume of the locking pin body 21, and reduces the impact on human tissue after the locking pin member 20 locking the medical thread 200 is released.

[0059] The wire pressing member 23 is movably received in the receiving cavity 217 and movably connected to the guide portion 218. In this embodiment, the wire pressing member 23 includes a wire pressing portion 231 and a connecting portion 233 fixedly connected. The wire pressing portion 231 can be pressed against the bottom wall 2173 of the wire pressing groove 2171. The outer diameter of the wire pressing portion 231 is larger than the outer diameter of the connecting portion 233. The connecting portion 233 can roll within the guide portion 231, and the wire pressing portion 231 and the connecting portion 233 are coaxially arranged.

[0060] The wire clamping member 23 also includes a limiting part 235 fixed to the connecting part 233 to prevent the connecting part 233 from disengaging from the guide part 18. In this embodiment, the guide part 18 is a guide groove penetrating the locking pin body 21, the connecting part 233 passes through the guide groove, the limiting part 235 is located outside the locking pin body 21, and the diameter of the limiting part 235 is greater than the opening height of the guide groove. In this embodiment, the guide part 18 is formed on the second surface 2152 and the fourth surface 2154. In other embodiments, the guide part 18 can be a guide rail provided on the inner wall of the receiving cavity 217, the connecting part 233 can be received in the receiving cavity 217 and can roll along the guide rail, and the limiting part 235 can be omitted.

[0061] The locking pin component 20 also includes an end cap 25, which is fixedly disposed at the distal end of the second mounting portion 215 to close the distal end of the locking pin body 21. The end cap 25 also limits the movement of the wire clamping member 23 on the guide portion 218 to prevent the wire clamping member 23 from detaching from the locking pin body 21. The locking pin body 21 and the end cap 25 are separately disposed to facilitate the assembly and disassembly of the wire clamping member 23. The end cap 25 is provided with a wire inlet hole 251 for inserting a medical suture 200 into the receiving cavity 217.

[0062] Since the locking component 20 (including the locking body 21, the pressure wire 23 and the end cap 25) is ultimately implanted into the human body, the material of the locking component 20 includes, but is not limited to, biocompatible materials such as stainless steel, pure titanium, nickel titanium, and cobalt chromium alloy, with pure titanium and stainless steel being preferred.

[0063] Please see Figures 2 to 7 , combined Figures 24 to 25 The push rod 31 of the locking member 30 is movably inserted into the insertion channel 131. When the push rod 31 rotates, causing it to move synchronously axially towards the distal end (i.e., forward direction), it pushes the suture clamping member 23 to move along the guide portion 218 from the proximal end to the distal end (i.e., forward movement), gradually pressing the medical suture 200 into the suture clamping portion 231 and the suture clamping groove 2171 of the suture clamping member 23. Then, the suture cutting member 50 moves axially towards the proximal end, cutting off the excess medical suture 200 on the mating member 15. During the suture cutting process, due to the push rod 31... The self-locking effect of the external thread and the threaded hole 211 of the locking pin body 21, and the continuous pushing of the distal end of the push rod 31 against the suture pressing member 23, prevents the suture pressing member 23 from moving towards the proximal end, so that the suture pressing part 231 of the suture pressing member 23 and the bottom wall 2173 of the suture pressing groove 2171 always maintain a minimum gap to press the medical suture 200 tightly. Even if the medical suture 200 is pulled towards the proximal end or subjected to other external forces during the operation, it can prevent the medical suture 200 from loosening and ensure reliable locking.

[0064] The locking wire component 30 also includes a locking wire core 33 fixedly connected to the proximal end of the push rod 31. The locking wire core 33 is used to drive the push rod 31 to rotate and move axially. The locking wire core 33 is a flexible body with anti-torsional support force, preferably a laser-cut tube, spring, stainless steel wire, or multi-layer solid mandrel. In this embodiment, stainless steel wire is used for the locking wire core 33. By driving the locking wire core 33 to rotate, the push rod 31 can be driven to rotate and move. When the locking wire core 33 is rotated in a preset direction, the locking wire core 33 drives the push rod 31 to move forward towards the distal end, and the push rod 31 can drive the wire pressing component 23 to move relative to the locking pin body 21. After the wire is cut, the locking wire core 33 is rotated in the opposite direction, and the locking wire core 33 drives the push rod 31 to move backward towards the proximal end, and the distal end of the push rod 31 separates from the locking pin body 21.

[0065] Please refer to it again. Figures 2 to 5 , combined Figure 26The tangent component 50 includes a tool holder 51, a blade 53, and a drive component 55. The tool holder 51 is used to support the blade 53, and the drive component 55 is used to drive the blade 53 to move.

[0066] The tool holder 51 is located between the first base 11 and the mating member 15. The tool holder 51 is slidably sleeved on the support member 13, allowing it to move along the support member 13. The tool holder 51 has a mounting groove 511 for mounting the cutting blade 53. The tool holder 51 also includes a third mounting portion 512 and a fourth mounting portion 514. The fourth mounting portion 514 protrudes axially from the distal end face of the third mounting portion 512. The proximal end of the third mounting portion 512 has a through hole 5120 for through which the support member 13 passes. The third mounting portion 512 is anti-rotatingly connected to the support member 13. Preferably, in combination... Figure 8 As shown, the support member 13 includes two opposing planes 135 and two opposing arc surfaces 137. The outline of the through hole 5120 is adapted to the shape of the support member 13, and the cooperation between the planes prevents the tool holder 51 from rotating relative to the support member 13.

[0067] The fourth mounting portion 514 is mounted on the step 1113 and can slide along the axial direction of the first base 11. The step 1113 provides support for the blade holder 51 and also guides the axial movement of the blade holder 51, which helps to improve the stability of the movement of the blade holder 51. In addition, the shapes of the step 1113 and the fourth mounting portion 514 are complementary and compatible, and the two share radial and axial space, thereby reducing the radial dimension and axial length of the distal end of the medical locking and cutting integrated device 100, which helps to reduce the volume and weight of the medical locking and cutting integrated device 100.

[0068] The blade 53 is fixedly housed within the mounting slot 511. After assembly, a gap 530 exists between the blade 53 and the support member 13 (e.g., ...). Figure 2 As shown), for the medical suture 200 (such as) for the self-locking nail body 21. Figure 1 , Figure 4 and Figure 5 (As shown) It protrudes and is located below blade 53. Blade 53 has a cutting edge 531. See also Figure 4 The mating component 15 also has a tangent surface 153 positioned opposite the cutting edge 531. The cutting edge 531 and the tangent surface 153 cooperate to cut the medical suture 200 extending from the suture hole 219 of the self-locking staple body 21. During the cutting process of the tangent component 50, the tangent surface 153 provides abutment for the medical suture 200, facilitating the cutting edge 531 to cut the medical suture 200. In this embodiment, the tangent surface 153 is planar. It can be understood that the tangent surface 153 can also be curved.

[0069] The driving component 55 is fixedly connected to the blade holder 51, driving the blade holder 51 to move along the support member 13 toward the mating member 15, so that the blade 53 cooperates with the mating member 15 to cut the medical suture 200 extending from the suture outlet hole 219 of the self-locking nail body 21. The driving component 55 includes a connecting rod 551, a guide member 553, and a suture cutting core 555. The connecting rod 551 is fixedly connected between the guide member 553 and the third mounting portion 512 of the blade holder 51. The suture cutting core 555 is fixedly connected to the guide member 553 and is used to drive the connecting rod 551, the guide member 553, and the blade holder 51 to move axially.

[0070] More specifically, the proximal end of the third mounting portion 512 of the tool holder 51 is provided with a connecting hole 5121. The connecting rod 551 is fixedly connected to the connecting hole 5121, thereby achieving a fixed connection between the connecting rod 551 and the tool holder 51. The mating part 15 is also provided with a guide hole 155, through which the connecting rod 551 passes (e.g., ...). Figure 8 (As shown). In this embodiment, the guide hole 155 is generally semi-waist-shaped and passes through the peripheral wall of the mating member 15. The inner wall of the guide hole 155 guides the movement of the connecting rod 551 relative to the support member 13. The connecting rod 551 is a rigid body with a certain length, preferably a rigid body such as a stainless steel tube or stainless steel rod; in this embodiment, a stainless steel rod is used. In this embodiment, there are two connecting rods 551, and the support member 13 is located between the two connecting rods 551. The two connecting rods 551 are symmetrically arranged about the central axis of the support member 13, which improves the stability of the movement of the tool holder 51 relative to the support member 13. It is understood that this application does not limit the number of connecting rods 551.

[0071] The guide member 553 is slidably sleeved on the support member 13, and is fixedly connected to the proximal end of the connecting rod 551. The guide member 553 is used to guide the movement of the tool holder 51. The guide member 553 is located between the mating member 15 and the second base 16. Please refer to the following: Figure 2 In this way, the portion of the support member 13 located between the first base 11 and the mating member 15 serves as a guide rail for the axial movement of the tool holder 51, and the portion of the support member 13 located between the mating member 15 and the second base 16 serves as a guide rail for the axial movement of the guide member 553. The guide member 553 also has a through hole 5531 adapted to the shape of the support member 13 to ensure anti-rotation and guiding functions. The shape of the guide member 553 includes, but is not limited to, circles, ellipses, etc.

[0072] The tangent core 555 is fixedly connected to the proximal end of the guide 553. The mating component 15 is located between the tool holder 51 and the guide 553. The tangent core 555 is a flexible body with torsional support, preferably a laser cutting tube, spring, stainless steel wire, or multi-layer solid mandrel; in this embodiment, stainless steel wire is used. The tangent core 555 applies axial driving force to the guide 553, which drives the connecting rod 551 to move axially, thereby driving the tool holder 51 and the blade 53 to move.

[0073] Please see Figure 15 , Figure 16 , combined Figures 1 to 3b The sheath assembly 70 includes a sheath body 71 and a supporting inner tube 73. The sheath body 71 includes an outer tube 711 and a reinforcing mesh tube 713. The outer tube 711 is welded to the reinforcing mesh tube 713. The outer tube 711 is used to mount the supporting inner tube 73, and the reinforcing mesh tube 73 is used to improve the strength of the outer tube 711. The outer tube 711 has a first inner cavity 701 and a second inner cavity 703 that extend axially. The supporting inner tube 73 passes through the first inner cavity 701, and the tangential inner core 55 is movably passed through the supporting inner tube 73. The locking inner core 33 is movably passed through the second inner cavity 703.

[0074] The outer tube 711 is preferably made of polymer materials such as polyether block amide (PEBAX) or nylon. The outer tube 711 is connected to the reinforcing mesh tube 713 by, but not limited to, a heat-fusion method. Except for the first inner cavity 701 and the second inner cavity 703, the other parts of the sheath body 71 are filled with the material of the outer tube 711. The reinforcing mesh tube 713 is preferably, but not limited to, a metal braided mesh, such as stainless steel wire braided mesh, nickel-titanium wire braided mesh, or tungsten wire braided mesh. In this embodiment, the reinforcing mesh tube 713 is preferably a tungsten wire braided mesh.

[0075] To accommodate the position of the locking pin body 21 and align with the channel within the support member 13, the second inner cavity 703 is approximately located in the middle of the sheath body 71, with the central axis of the sheath body 71 situated within the second inner cavity 703. The first inner cavity 701 is offset to one side of the second inner cavity 703. The tangential core 555 is movably inserted within the support inner tube 73, i.e., movably inserted within the second inner cavity 703. Although the tangential core 555 is offset relative to the central axis of the sheath body 71, it still transmits tension through the guide member 553 to the two symmetrically arranged connecting rods 551 corresponding to the middle of the support member 13, thus enabling balanced axial movement of the cutter holder 51 and the cutting blade 53.

[0076] It is important to note that the inner support tube 73 is made of flat wire, cord, or strip material spirally wound around the axial direction. Please refer to [link / reference]. Figures 17 to 21The inner support tube 73 includes multiple spiral coils 731 arranged axially, each spiral coil 731 including two end faces 7310 arranged opposite each other axially. The inner support tube 73 has a straight state and a curved state. When the inner support tube 73 is in the straight state, it has a straight structure. When the inner support tube 73 is in the curved state, it has a curved structure and a curved portion. (e.g.,...) Figure 19 , Figure 20 When (as shown), on the inner side of the bent portion of the supporting inner tube 73 (the inner side of the bent portion refers to the side with a relatively small bending radius or the side relatively close to the bending center), between the adjacent end faces 7310 of the two adjacent spiral coils 731 (as shown) Figure 21 (As shown) The surfaces are in contact to resist each other.

[0077] When the lumen of the sheath assembly 70 needs to undergo compliant bending within a blood vessel, and the supporting inner tube 73 is in a bent state, when the tangential core 555 inserted in the supporting inner tube 73 is pulled proximally to cut the medical suture 200, the adjacent end faces 7310 of the two adjacent spiral coils 731 make surface contact under the pulling force of the tangential core 555, and can abut and support each other. This allows the supporting inner tube 73 to maintain a bent stable state, thereby enabling the supporting inner tube 73 to withstand the force of the tangent and providing stable and sufficient support for the tangent. This ensures the morphological stability of the bent portion of the supporting inner tube 73 and the sheath assembly 70, reduces the possibility of the sheath assembly 70 jumping or swaying, and significantly reduces the risk of tissue damage or tearing caused by the jumping or swaying of the sheath assembly 70.

[0078] In this embodiment, the supporting inner tube 73 is preferably, but not limited to, a flat wire spring tube. In contrast to the counterexample of using a round wire spring tube: in a bent state, the adjacent spiral coils of a round wire spring tube make point contact. Under the tension of the tangential inner core, the adjacent spiral coils will slide and misalign with each other, failing to reach a stable bending state, resulting in jumping or swaying. However, after bending, the flat wire spring tube, under the tension of the tangential inner core, creates surface contact between the adjacent end faces 7310 of the two adjacent spiral coils 731, allowing them to abut and support each other, thereby maintaining a stable bending state and preventing jumping or swaying.

[0079] like Figure 18 As shown, let the width of the material be a, the thickness of the material be b, and the inner diameter of the spiral ring be d. When the supporting inner tube 73 is in a straight state, there is an axial gap e between two adjacent spiral rings 731. Wherein:

[0080] 0 < a ≤ 3

[0081] 0 < b ≤ 1

[0082] And b < a

[0083] 0≤e≤0.5.

[0084] The helix angle of spiral ring 731 is c, tanc=2(2b+d) / (a+e), and 30°≤c≤80°.

[0085] The above parameter range setting allows the inner tube 73 to be easily bent, and after bending, it allows reliable surface contact between the adjacent end faces 7310 of the two adjacent spiral coils 731 to achieve mutual abutment and support, thereby maintaining a stable bending state.

[0086] Furthermore, please refer to the following: Figure 2 and Figure 22 The proximal end of the second base 16 is fixedly connected to the distal end of the supporting inner tube 73. In this embodiment, the proximal end of the second base 16 is provided with a material receiving groove 163 to facilitate fusion with the distal end of the outer tube 711. Please refer to [reference needed]. Figure 2 and Figure 23 The proximal end of the supporting inner tube 73 is welded and fixed to the connector 301 located inside the operating handle (not shown). The operating handle is equipped with corresponding operating mechanisms to operate the cutting inner core 555 and the locking inner core 33 respectively. For the sake of brevity, these will not be described in detail here.

[0087] In other embodiments, the sheath body 71 further includes a first inner tube (not shown) and a second inner tube (not shown), both of which pass through the outer tube 711 and are spaced apart. The lumen of the first inner tube forms a first inner cavity 701, and the lumen of the second inner tube forms a second inner cavity 703. A reinforcing mesh tube 713 passes through the outer tube 711 and surrounds the first and second inner tubes. The outer tube 711 is fixed to the first and second inner tubes by, but not limited to, a welding method. The material of the first and second inner tubes is preferably, but not limited to, polytetrafluoroethylene (PTFE).

[0088] It is understood that in some embodiments, the reinforcing mesh 713 may be omitted from the sheath body 71.

[0089] The medical locking and cutting integrated device 100 provided in this application connects the locking pin component 20, the locking suture component 30, and the cutting suture component 50 together through the base component 10, thereby integrating the locking and cutting suture functions into one unit. The locking and cutting suture operations can be completed in a single intervention, which can reduce the number of times the instrument is inserted into the body during surgery, simplify the surgical procedure, and save surgical time. During the cutting suture operation, the distal end of the push rod 31 in the locking pin component 30 and the self-locking structure 210 on the locking pin body 21 of the locking pin component 20 can maintain the position of the locking pin component 20 locking the medical suture 200, ensuring that the medical suture 200 is always locked. In this way, the medical suture 200 is prevented from coming loose from the locking pin component 20, preventing the locking pin component 20 from falling off and eliminating the risk to the human body caused by the falling locking pin component 20.

[0090] The mitral valve is a one-way valve between the left atrium (LA) and the left ventricle (LV), ensuring blood flows from the left atrium to the left ventricle. A normal, healthy mitral valve has multiple chordae tendineae. The mitral valve leaflets are divided into anterior and posterior leaflets. When the left ventricle is in diastole, both leaflets are open, allowing blood to flow from the left atrium to the left ventricle. When the left ventricle is in systole, the chordae tendineae are stretched, preventing the leaflets from being pushed into the atrium by the blood flow. The anterior and posterior leaflets close properly, ensuring blood flows from the left ventricle through the aortic valve (AV) to the aorta. If the chordae tendineae rupture, when the left ventricle is in systole, the mitral valve cannot return to a fully closed state as it normally would, resulting in incomplete closure. The force of the blood flow can further cause the leaflets to dislodge into the left atrium, causing blood regurgitation.

[0091] The following example of mitral valve chordae tendineae repair surgery, using medical sutures as the repair sutures for artificial chordae tendineae, illustrates the use of the medical locking and cutting integrated device 100 provided in this embodiment in chordae tendineae repair surgery.

[0092] Step 1: First, implant one or more medical sutures (200mm each) into the anterior or posterior leaflet of the mitral valve.

[0093] Step 2: Insert the medical sutures 200 on the valve leaflets into the anchoring element of the anchoring device outside the patient's body, and then insert the anchoring element into the left ventricle and anchor it to the anterior papillary muscle, posterior papillary muscle, or ventricular wall.

[0094] Step 3: Externally, thread all the medical sutures 200 from the valve leaflets into the locking pin component 20 of the medical locking and cutting integrated device 100, and then pass the medical sutures 200 through the outlet hole 219 on the locking pin body 21 and the through hole 171 on the sleeve 17. Figure 1 As shown.

[0095] Step 4: Guided by the medical suture 200, the distal end of the medical locking and cutting integrated device 100 is pushed into the left atrium of the heart via the femoral vein and interatrial septum, moving closer to the anterior or posterior papillary muscles of the left ventricle, while simultaneously pulling the medical suture 200 until the distal end of the medical locking and cutting integrated device 100 reaches the predetermined position within the left ventricle. During this process, the sheath assembly 70 will bend to adapt to the vascular morphology.

[0096] Step 5: Adjust the tightness of each medical suture 200 individually, while simultaneously using ultrasound to determine the state of least mitral regurgitation. Once this state is reached, stop adjusting and maintain the tightness of each medical suture 200. Please refer to [link / reference]. Figure 24 At this point, the pressure member 23 is located near the end of the locking pin body 21. Rotating the locking pin component 30 drives the push rod 31 to move axially towards the distal end against the pressure member 23, continuously pressing the medical suture 200 into the pressure groove 2171 of the locking pin body 21 (e.g., ...). Figure 14 (As shown). When the wire clamping component 23 moves to the limit position of the end cap 25, the medical thread 200 is pressed tightly against the locking pin body 21 by the wire clamping component 23, as shown. Figure 25 As shown.

[0097] Step 6: After compressing the medical suture 200, apply axial tension to the suture core 555. Guided by the support 13, the suture component 50 moves from the distal end to the proximal end, cutting off the excess medical suture 200 on the tangential surface 153 of the mating component 15. Figure 26 As shown. Specifically, during the suture cutting process, the cutting edge 531 of the blade 53 presses against the tangent surface 153, which provides a support for the medical suture 200 and a point of force for the cutting edge 531 of the blade 53, making it easy to cut the medical suture 200. At the same time, since the cutting edge 531 of the blade 53 and the tangent surface 153 are in a mutually pressing relationship, there is no interlacing relationship like that of scissors, and therefore there is no abnormal situation of suture extrusion between the blade 53 and the tangent surface 153. This ensures that the entire medical locking and cutting integrated device 100 can be smoothly withdrawn afterward, avoiding the risk of organ tissue being pulled due to suture extrusion. During the suture cutting process of the suture cutting component 50, the self-locking structure 210 keeps the suture pressing component 23 in the position that locks the medical suture 200, without loosening. It should also be emphasized that when the inner support tube 73 is in a bent state, under the tension of the tangential inner core 555, the adjacent end faces 7310 of the two adjacent spiral coils 731 make surface contact and can abut and support each other, thereby enabling the inner support tube 73 to maintain a bent stable state. This allows the inner support tube 73 to withstand the force of the tangent and provide stable and sufficient support for the tangent, ensuring the shape stability of the bent part of the inner support tube 73 and the sheath assembly 70, reducing the possibility of the sheath assembly 70 jumping or swaying, and significantly reducing the risk of leaflet damage or tearing caused by jumping or swaying of the sheath assembly 70.

[0098] After the tangent is cut, the locking wire component 30 (push rod 31 and locking wire core 33) is rotated, driving the locking wire component 30 to move axially towards the proximal end. The distal end of the push rod 31 separates from the locking pin body 21 of the locking pin component 20. Since the proximal end of the locking pin body 21 has a frustum-shaped structure, under the force of the heartbeat, the locking pin component 20 is easily released from the first base 11, such as... Figure 27 As shown.

[0099] Step 7: Remove the base component 10, locking component 30, cutting component 50, and excess medical suture 200 of the medical locking and cutting integrated device 100 from the patient's body, leaving the locking component 20 inside the patient's body. At this time, the locking component 20 will hold the medical suture 200 (such as...) Figure 28 (As shown) It is fixed to the anterior or posterior papillary muscle or the ventricular wall, and the chordae tendineae complete the reconstruction.

[0100] It is understandable that the medical suture 200 can also be a suture, a repair suture for edge-to-edge repair of valves, etc. The medical locking and cutting integrated device 100 provided in this application can also be used for tissue suturing, edge-to-edge repair of valves, etc., to lock and cut the medical suture 200.

[0101] It is understood that the locking pin component 20 and the suture locking component 30 in the aforementioned medical suture cutting integrated device 100 can be removed, leaving only the medical suture cutting device 101 composed of the base component 10, the suture cutting component 50, and the sheath assembly 70. After the medical suture is locked using an additional suture locking device, the suture cutting device 101 can be inserted into the body alone to cut off any excess medical suture.

[0102] The above are some embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. A sheath assembly, comprising: The sheath assembly is applied to a medical thread cutting device, and a distal end of the sheath assembly is used to set a base member of the medical thread cutting device; The sheath assembly comprises a sheath body and a supporting inner tube; the sheath body has a first inner cavity penetrating in the axial direction, and the supporting inner tube is arranged in the first inner cavity; the supporting inner tube is spirally wound by a material around the axial direction, and comprises a plurality of spiral turns arranged in the axial direction, each of the spiral turns comprises two end faces oppositely arranged in the axial direction; the supporting inner tube is used to pass through a thread cutting inner core of the medical thread cutting device, and when the supporting inner tube is in a curved state, the adjacent two end faces of the adjacent two spiral turns are in surface contact to resist each other on the inner side of the curved part of the supporting inner tube.

2. The sheath assembly of claim 1, wherein, The material is a flat wire, a wire or a strip; the width of the material is greater than the thickness of the material.

3. The sheath assembly of claim 2, wherein, The cross-sectional shape of the material is rectangular.

4. The sheath assembly of any of claims 1-3, wherein, The supporting inner tube is a flat spring tube.

5. The sheath assembly of claim 4, wherein, The width of the material is a, the thickness of the material is b, the inner diameter of the spiral turn is d, and when the supporting inner tube is in a flat state, the axial gap between the adjacent two spiral turns is e; wherein 0 < a ≤ 3 and 0 < b ≤ 1 and 0 ≤ e ≤ 0.5; the helix angle of the helical turns is c, and 30° ≤ c ≤ 80°.

6. The sheath assembly of claim 1, wherein, The sheath body comprises an outer tube and a reinforcing mesh tube, the outer tube is welded with the reinforcing mesh tube, and the first inner cavity is formed in the outer tube and surrounded by the reinforcing mesh tube.

7. The sheath assembly of claim 6, wherein, The sheath body further comprises a first inner tube, the outer tube is welded with the first inner tube, and the lumen of the first inner tube is the first inner cavity.

8. A medical wire cutting device, characterized by The sheath assembly, the thread cutting member and the base member as claimed in any one of claims 1-7 are included; the base member is connected to the distal end of the sheath assembly, and the base member comprises a support extending in the axial direction and a matching member connected to the support, and the matching member has a thread cutting surface; the thread cutting member comprises a knife seat slidingly sleeved on the support and located on the distal side of the thread cutting surface, a blade fixedly connected to the knife seat, and a thread cutting inner core connected to the knife seat to drive the knife seat to move in the axial direction, and the thread cutting inner core movably passes through the supporting inner tube of the sheath assembly.

9. The medical thread cutting device of claim 8, wherein, The knife seat is provided with a mounting groove, the blade is fixedly accommodated in the mounting groove, and there is a gap between the blade and the support, the blade has a cutting edge, and the cutting edge cooperates with the thread cutting surface to cut the medical thread extending through the gap.

10. The medical thread cutting device of claim 8, wherein, The thread cutting member further comprises a connecting rod and a guide, the connecting rod is fixedly connected to the proximal end of the knife seat, the matching member is provided with a guide hole, and the connecting rod passes through the guide hole; the guide is slidingly sleeved on the support, the guide is fixedly connected to the proximal end of the connecting rod, the thread cutting inner core is fixedly connected to the proximal end of the guide; the matching member is located between the knife seat and the guide.

11. A medical lock and cut integrated device, characterized by The medical thread cutting device, the locking member and the locking wire member as claimed in any one of claims 8-10 are included; the sheath body further comprises a second inner cavity penetrating in the axial direction. The base member further comprises a first base, and a distal end of the support member is fixedly connected to the first base; The locking member comprises a locking body and a line pressing member movably connected to the locking body, and the locking body is detachably arranged in the first base; The line locking member comprises a push rod and a line locking inner core connected to a proximal end of the push rod, a distal end of the push rod is detachably connected to the locking body, the line locking inner core is movably arranged in the second inner cavity, and the line locking inner core drives the push rod to move forward to drive the line pressing member to move relative to the locking body to lock the medical line between the line pressing member and the locking body. The medical line cutting device is used to cut the medical line extending from the locking body.

12. The medical lock-integrated device according to claim 11, wherein The first base comprises a first mounting portion and a second mounting portion fixedly connected to each other, the first mounting portion is located at a proximal end of the first base, a proximal end of the first mounting portion has a step, the knife seat comprises a third mounting portion and a fourth mounting portion, the fourth mounting portion is protruded on a distal end surface of the third mounting portion along an axial direction, and the fourth mounting portion is arranged on the step.

13. The medical lock-integrated device according to claim 12, wherein The second mounting portion is provided with an accommodation groove penetrating through along an axial direction, and the locking body is clearance-fitted in the accommodation groove; the first mounting portion is provided with a through groove penetrating through along an axial direction, and a proximal end of the support member is fixedly connected to the through groove; the support member is provided with a penetrating channel penetrating through along an axial direction and communicating with the accommodation groove, and the push rod is movably arranged in the penetrating channel.

14. The medical lockout integration device of claim 11, wherein, The base member further comprises a second base fixed to a proximal end of the support member, a proximal end of the second base is fixedly connected to a distal end of the sheath body and a distal end of the support inner tube, and the matching member is located between the knife seat and the second base.

15. The medical lock-integrated device according to claim 11, wherein The push rod and the locking body are provided with self-locking structures matched with each other, and the self-locking structures are used to prevent the push rod from moving reversely under the action of the medical line.

16. The medical lock-integrated device according to claim 15, wherein The self-locking structure comprises external threads arranged at a distal end of the push rod and a threaded hole arranged at a proximal end of the locking body and matched with the external threads; The support member is provided with a penetrating channel penetrating through along an axial direction, and the penetrating channel communicates with the threaded hole, and the push rod is movably arranged in the penetrating channel.

17. The medical lock-integrated set according to any one of claims 11 to 16, characterized in that The locking body has a receiving cavity, and the line pressing member is movably arranged in the receiving cavity; the locking body comprises a first mounting portion and a second mounting portion, and the first mounting portion is located at a proximal end of the locking body; the first mounting portion is reduced in size in each direction compared to the second mounting portion; The first base and the second mounting portion of the locking body are clearance-fitted, and the first base and the second mounting portion are provided with rotation-stopping structures matched with each other.

18. The medical lock-integrated device according to claim 17, wherein The locking body further comprises a line outlet hole communicating with the receiving cavity, the line outlet hole extends from the second mounting portion to the first mounting portion, and the line outlet hole is used to lead the medical line out of the receiving cavity.

19. The medical lock-integrated device according to claim 18, characterized in that The ratio between the length of the wire outlet hole and the length of the lock pin body ranges from 1 / 3 to 1 / 2; the ratio between the width of the wire outlet hole and the maximum width of the lock pin body ranges from 1 / 3 to 1.

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