Surgical suture catching net and its catching device, suturing system

Abstract

The application discloses a surgical suture catching net and a catching device and a suturing system thereof, and relates to the technical field of medical devices. The surgical suture catching net comprises a net main body which is woven by metal wires and is contracted; the net main body comprises a first contraction part and a second contraction part which are opposite to each other, and the second contraction part is used for being fixed with a distal end of a push-pull rod; the net main body has an unfolded state and a contracted state, and the contracted state is formed by elastic deformation of the net main body in the unfolded state; the net main body in the unfolded state has a cavity which is surrounded by a distal end part, a proximal end part and a circumferential side part; the distal end part is in a convex structure; the second contraction part is used for being pulled to the proximal end by the push-pull rod so as to force the first contraction part to move to the distal end, and the net main body in the unfolded state is contracted into a strip-shaped net main body. When the catching net is contracted, the net main body in the unfolded state is elastically deformed, the first contraction part is forced to move to the distal end, and the situation that the catching net is stuck at the end of a sheath and cannot be completely contracted into the sheath is avoided.

Description

Technical Field

[0001] This application relates to the field of medical device technology, specifically to a surgical suture catching net and its catching device and suturing system. Background Technology

[0002] The foramen ovale is a physiological passage in the atrial septum of the heart during fetal development, allowing blood to flow from the right atrium to the left atrium, bypassing the non-functional pulmonary circulation. After birth, as pulmonary circulation develops and left atrial pressure increases, the foramen ovale functionally closes in most people and fuses anatomically within the first year. If fusion is not achieved by age 3, a patent foramen ovale (PFO) is formed, which occurs in approximately 20%-25% of adults.

[0003] One approach to treating patent foramen ovale (PFO) clinically involves using a patent foramen ovale (PFO) suture system. During suturing, a puncture needle is inserted from the right atrium into the left atrium, and the suture is threaded through the needle. The suture is pushed distally until it enters the catcher, which then captures the suture end and guides it out through the PFO suture from the left atrium, ensuring both ends of the suture are on the right atrium. Tightening the suture "locks" the PFO suture, closing the cavity and achieving the ideal "intervention without implantation" effect. However, when pulling the catcher back into the sheath to capture the suture, it may become stuck at the sheath end, preventing complete retraction and potentially causing surgical failure. Utility Model Content

[0004] This application provides a surgical suture catching net and its catching device and suturing system, which can solve the problem of the catching device getting stuck during pullback.

[0005] According to one aspect of this application, one embodiment provides a surgical suture catching net, comprising: The main body of the net is made of woven and bundled metal wires; The net body includes a first gathering part and a second gathering part, the second gathering part being used to fix the distal end of the push-pull rod. The net body has an unfolded state and a contracted state. The contracted state is formed by the elastic deformation of the net body in the unfolded state. The net body in the contracted state is strip-shaped. The unfolded mesh body has a cavity, which is formed by a distal end, a proximal end, and a circumferential side portion connecting the distal end and the proximal end. The distal end has an outward convex structure. The first gathering portion is located in the middle of the distal end. The proximal end is used for a puncture needle to pass through to deliver the suture into the mesh body. The second gathering portion is located in the middle of the proximal end. The second gathering portion is used to be pulled proximally by the push-pull rod so that the proximal end is pushed distally, and the first gathering portion is forced to move distally, shrinking the unfolded mesh body into a strip-shaped mesh body.

[0006] In one embodiment, the distal end has a conical convex structure, and the angle between the line connecting the center of the first convergent portion and the center of the second convergent portion and the distal end is a first angle, which is less than 90 degrees.

[0007] In one embodiment, the first included angle is 30 degrees to 85 degrees.

[0008] In one embodiment, the proximal end is conical, and the angle between the line connecting the center of the first convergent portion and the center of the second convergent portion and the proximal end is a second angle, which is greater than 90 degrees.

[0009] In one embodiment, the second included angle is 100 degrees to 150 degrees.

[0010] In one embodiment, the metal wire is a shape memory alloy with elasticity; The main body of the net is woven from multiple strands of the metal wires, and one end of each strand of the metal wires is gathered to form a shaft-shaped second gathering portion. The line connecting the center of the first gathering portion and the center of the second gathering portion coincides with the central axis of the second gathering portion.

[0011] In one embodiment, one end of each of the multiple strands of metal wires is gathered and enclosed to form a second gathering portion with an axle hole, for inserting and fixing the distal end of the push-pull rod. The line connecting the center of the first gathering portion and the center of the second gathering portion coincides with the central axis of the axle hole.

[0012] In one embodiment, the axial length of the circumferential side portion is 3mm-30mm, and the axial length of the circumferential side portion is 1 / 5 of the outer circumferential diameter of the circumferential side portion.

[0013] According to another aspect of this application, one embodiment provides a surgical suture catching device, including a push-pull rod and a surgical suture catching net as described above; The second converging part is fixed to the distal end of the push-pull rod. The push-pull rod is used to push the capture net out of the sheath tube to form the net body in the unfolded state. The push-pull rod is also used to pull the capture net back into the sheath tube to form the net body in the contracted state.

[0014] According to another aspect of this application, one embodiment provides a surgical suture suturing system, including a suturing device and a surgical suture capture device as described above; the suturing device includes a puncture needle and a suture, the puncture needle being used to pass through the target tissue and the proximal end to deliver the suture into the mesh body.

[0015] According to the surgical suture capturing net and its capturing device and suturing system of the above embodiments, the net body has an unfolded state and a contracted state, and the contracted state is formed by the elastic deformation of the net body in the unfolded state. During suturing, the puncture needle is passed through the proximal end to deliver the suture into the net body. After the puncture needle is withdrawn, the push-pull rod is pulled, and the sheath sleeved on the push-pull rod will apply a distal pushing force to the proximal end of the net body in the unfolded state, so that the net body in the unfolded state will undergo elastic deformation. Because the distal end has an outward convex structure, the deformation will force the first gathering part to move distally, thereby shrinking the net body in the unfolded state into a strip-shaped net body. This helps to avoid the capture net getting stuck at the end of the sheath and not being able to be completely gathered into the sheath, ensuring the smooth progress of the operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a capture net according to one embodiment; Figure 2 This is a schematic diagram illustrating the connection between a capture net and a push-pull rod in one embodiment. Figure 3 This is a schematic diagram illustrating the structure in which the proximal edge of a capture net contacts the tissue to be sutured, according to one embodiment. Figure 4 This is a schematic diagram of the structure after the proximal end is attached to the tissue to be sutured, according to one embodiment. Figure 5 This is a schematic diagram of the structure of a surgical suture suture capture device according to one embodiment; Figure 6 This is a schematic diagram of the structure of a suture system according to one embodiment; Figure 7 This is a schematic diagram of the structure of a portion of the capture net after it is retracted into the sheath, according to one embodiment. Explanation of reference numerals in the attached figures: 1-Distal end; 2-Circumferential side; 3-Proximal end; 4-First gathering part; 5-Second gathering part; 6-Push-pull rod; 7-Sheath; 8-Tissue to be sutured; 9-Net body; 10-Grabbing control handle; 11-Punch needle; 12-Suture control handle. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0018] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0019] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. Unless otherwise specified, the terms "connection" and "linkage" used in this application include both direct and indirect connections (linkages).

[0020] One approach to treating patent foramen ovale (PFO) clinically involves using a patent foramen ovale (PFO) suture system. During suturing, a puncture needle is inserted from the right atrium into the left atrium, and the suture is threaded through the needle. The suture is pushed distally until it enters the catcher, which then captures the suture end and guides it out through the PFO suture from the left atrium, ensuring both ends of the suture are on the right atrium. Tightening the suture "locks" the PFO suture, closing the cavity and achieving the ideal "intervention without implantation" effect. However, when pulling the catcher back into the sheath to capture the suture, it may become stuck at the sheath end, preventing complete retraction and potentially causing surgical failure.

[0021] This application uses a push-pull rod to apply a pushing force from the proximal end to the distal end of the unfolded net body through a sheath sleeve fitted on the push-pull rod. The unfolded net body undergoes elastic deformation. Because the distal end has an outward convex structure, the deformation forces the first gathering part to move distally. This allows the unfolded net body to be contracted into a strip-shaped net body, which helps to avoid the capture net getting stuck at the end of the sheath and not being able to be completely retracted into the sheath, thus ensuring the smooth progress of the operation.

[0022] The following describes some embodiments of the surgical suture catching net, catching device, and suturing system provided in this application, with reference to the accompanying drawings.

[0023] Please see Figures 1 to 7 This application provides a surgical suture catching net, including a net body 9 and other functional components as needed, which are described in detail below.

[0024] In this embodiment, the net body 9 is woven and bundled from metal wires. The net body 9 includes a first bundled portion 4 and a second bundled portion 5, which are opposite each other. The second bundled portion 5 is used to fix the distal end of the push-pull rod 6. The net body 9 has an unfolded state and a contracted state. The contracted state is formed by the elastic deformation of the net body 9 in the unfolded state. The net body 9 in the contracted state is strip-shaped. The net body 9 in the unfolded state has a cavity, which is surrounded by a distal end 1, a proximal end 3, and a circumferential side portion 2 connecting the distal end 1 and the proximal end 3. The distal end 1 has an outward convex structure. The first bundled portion 4 is located in the middle of the distal end 1. The proximal end 3 is used for the puncture needle 11 to pass through to deliver the suture into the net body 9. The second bundled portion 5 is located in the middle of the proximal end 3. The second bundled portion 5 is used to be pulled towards the proximal end by the push-pull rod 6 so that the proximal end 3 is pushed towards the distal end, and the first bundled portion 4 is forced to move towards the distal end, thus contracting the unfolded net body 9 into a strip-shaped net body 9.

[0025] It is understood that this application does not limit the specific weaving method, weaving density, or diameter of the metal wires; any method can be used to capture the sutures. For example, the diameter of the metal wire can be set to 0.08mm-0.2mm, and the number of strands can be 12-108. In this application, the first gathering part 4 and the second gathering part 5 are the sections where the ends of the metal wires are gathered together. The first gathering part 4 can be formed by gathering the distal ends of each metal wire and welding them to a metal fixing component. In this application, the distal end 1 is the end of the net body 9 in its unfolded state near the distal end, and the proximal end 3 is the end of the net body 9 in its unfolded state near the proximal end. In this application, the distal end is the end where the sutures and capturing net enter the patient's body, and the proximal end is the end near the patient's body. In this application, the circumferential side part 2 has a cylindrical structure, and correspondingly, the distal end 1 and proximal end 3 have a shape similar to a disc. In this application, the distal end portion 1 has an outwardly convex structure, that is, the distal end portion 1 protrudes from the end of the circumferential side portion 2 toward the distal end. In one embodiment, the distal end portion 1 and the circumferential side portion 2, and the proximal end portion 3 and the circumferential side portion 2 are connected by a circular arc transition, which is more conducive to elastic deformation from the unfolded state to the contracted state.

[0026] The unfolded mesh body 9 in this application is the mesh body 9 in its natural state, that is, the mesh body 9 is naturally unfolded when it is not squeezed or tightened. For example, the mesh body 9 located outside the sheath 7 can be unfolded. The unfolded mesh body 9 facilitates the insertion of the puncture needle 11. The contracted mesh body 9 in this application is formed by the elastic deformation of the mesh body 9 under the restraint force of the sheath 7. The contracted mesh body 9 is strip-shaped so as to be pulled back into the sheath 7 to realize the retraction of the suture. In this application, the second gathering part 5 is used to be pulled proximally by the push-pull rod 6, such as... Figure 2 As shown, because the sheath 7 is stationary, the proximal end 3 of the unfolded net body 9 is pushed distally by the sheath 7 fitted onto the push-pull rod 6. Driven by this thrust, as... Figure 7As shown, the mesh body 9 begins to retract from the proximal end 3, and then sequentially retracts the circumferential side 2 and the distal end 1, until the distal end 1 is completely retracted, i.e., the mesh body 9 is completely retracted into the sheath tube 7 and is in a contracted state. The contracted mesh body 9 can clamp and fix the suture. While the proximal end 3 retracts, because the mesh body 9 is an elastically deformable integral structure, the proximal end 3 will drive the circumferential side 2 to retract towards the center. The retracted circumferential side 2 will exert a pushing force towards the center on the proximal end of the distal end 1. Because the distal end 1 has an outward convex structure, when its proximal end is subjected to a pushing force towards the center, it will force the first gathering part 4 located in the middle of the distal end 1 to move towards the distal end, which helps to prevent the first gathering part 4 from moving towards the proximal end during retraction and causing jamming. When the proximal end 3 retracts, it gradually enters the sheath 7 under the pull of the push-pull rod 6. After the proximal end 3, the circumferential side 2, and the distal end 1 are all completely retracted, a strip-shaped net body 9 is formed. At this time, the capture net is pulled back into the sheath 7. Because the suture was pushed into the net body 9 by the puncture needle 11 before retraction, and the suture was clamped and fixed by the net body 9 during the retraction process, the suture will also be pulled back into the sheath 7. Continuing to pull the push-pull rod 6 will allow the capture net to bring the end of the suture out of the body.

[0027] The surgical suture capture net in this embodiment includes a net body 9, which has an unfolded state and a contracted state. The contracted state is formed by the elastic deformation of the unfolded net body 9. During suturing, the puncture needle 11 is passed through the proximal end 3 to deliver the suture into the net body 9. After the puncture needle 11 is withdrawn, the push-pull rod 6 is pulled. The sheath 7 sleeved on the push-pull rod 6 will then apply a distal pushing force to the proximal end 3 of the unfolded net body 9, causing the unfolded net body 9 to undergo elastic deformation. Because the distal end 1 has an outward convex structure, the deformation will force the first gathering part 4 to move distally. This allows the unfolded net body 9 to contract into a strip-shaped net body 9, which helps to avoid the capture net getting stuck at the end of the sheath 7 and not being able to completely retract into the sheath 7, ensuring the smooth progress of the surgery.

[0028] In one embodiment, such as Figure 1 As shown, the distal end 1 is conical in shape, and the angle α between the line L connecting the center of the first converging portion 4 and the center of the second converging portion 5 and the distal end 1 is the first included angle, which is less than 90 degrees. Figure 7As shown, during the inward retraction of the distal end 1, it is subjected to a radial thrust towards the center. This thrust generates a force towards the distal end in the direction of the central axis. Because the first included angle is less than 90 degrees, the first constriction portion 4 can be pushed towards the distal end, which is beneficial for the retraction of the distal end 1 and prevents the distal end 1 from getting stuck on the outside of the sheath 7, causing surgical failure. At the same time, it can reduce the risk of instrument damage. In some embodiments, the distal end 1 may not be conical. For example, it may be an arc shape that bulges towards the distal end. The first constriction portion 4 is located at the top of the arc shape. The arc shape is the shape of the axial section of the distal end 1. The axial section is a plane passing through the central axis. The arc shape can also push the first constriction portion 4 towards the distal end during retraction, which is beneficial for the retraction of the distal end 1. In some embodiments, the distal end 1 may also be conical only in the middle part and planar at the outer edge. The angle between the line connecting the center of the first constriction portion 4 and the center of the second constriction portion 5 and the middle part of the cone is less than 90 degrees, or the distal end 1 may also be arc-shaped only in the middle part.

[0029] In one embodiment, the first included angle can be 30 degrees to 85 degrees, and the distal end 1 within this angle range is easier to close. In some embodiments, the first included angle can be 60 degrees, 65 degrees, 70 degrees, 75 degrees, or 80 degrees. In some embodiments, the first included angle can also be less than 30 degrees or greater than 85 degrees, but all must be less than 90 degrees.

[0030] In one embodiment, such as Figure 1 As shown, the proximal end 3 is conical. The angle β between the line L connecting the center of the first constriction portion 4 and the center of the second constriction portion 5 and the proximal end 3 is the second included angle, which is greater than 90 degrees. Before the puncture needle 11 is inserted, the proximal end 3 of the capture net needs to be pressed against and fixed relative to the tissue 8 to be sutured. When the second included angle is greater than 90 degrees, as... Figure 3 As shown, the support point for the contact between the capture net and the tissue 8 to be sutured is at the outer edge of the proximal end 3. When the capture net retracts and rests against the tissue 8 to be sutured, the included angle decreases, and the proximal end 3 moves closer to the tissue 8 to be sutured, as... Figure 4 As shown, the increased radial dimension of the proximal end of the capture net facilitates the entry of the puncture needle 11 and the delivery of the suture. In some embodiments, the proximal end 3 may also be conical in the middle and planar in the outer edge. The angle between the line connecting the center of the first gathering part 4 and the center of the second gathering part 5 and the middle part of the conical shape is greater than 90 degrees. In this case, after the proximal end 3 is close to the tissue 8 to be sutured, the radial dimension of the proximal end of the capture net can also be increased, which facilitates the entry of the puncture needle 11 and the delivery of the suture.

[0031] In one embodiment, the second included angle is 100-150 degrees, and the proximal end 3 within this angle range is more conducive to the deformation of the proximal end 3 and its contact with the tissue 8 to be sutured. In some embodiments, the second included angle may be 135 degrees, 140 degrees, 145 degrees, or 150 degrees. In some embodiments, the first included angle may also be greater than 90 degrees and less than 100 degrees, or greater than 150 degrees.

[0032] In one embodiment, the metal wire can be a shape memory alloy with elasticity; the mesh body 9 is woven from multiple strands of metal wire, with one end of each strand gathered to form a shaft-shaped second gathering portion 5. The line L connecting the center of the first gathering portion 4 and the center of the second gathering portion 5 coincides with the central axis of the second gathering portion 5. The shape memory alloy has good elasticity, which is beneficial for the gathering deformation of the mesh body 9 and its elastic recovery when pushed out. During manufacturing, multiple strands of metal wire can be woven first, and then shaped into the unfolded mesh body 9 structure. When fixing, the central axis of the push-pull rod 6 can be made to coincide with or approximately coincide with the central axis of the second gathering portion 5. This ensures that the line connecting the center of the first gathering portion 4 and the center of the second gathering portion 5 coincides with the central axis of the push-pull rod 6, which is beneficial for the uniform inward gathering of the mesh body 9 under force and also facilitates the smoother entry of the mesh body 9 into the sheath tube 7.

[0033] In one embodiment, one end of each of the multiple metal wires is gathered and enclosed to form a second gathering portion 5 with a shaft hole, for inserting and fixing the distal end of the push-pull rod 6. The line L connecting the center of the first gathering portion 4 and the center of the second gathering portion 5 coincides with the central axis of the shaft hole. During fixing, the distal end of the push-pull rod 6 can be inserted into the shaft hole and fixed, so that the line L connecting the center of the first gathering portion 4 and the center of the second gathering portion 5 coincides with the central axis of the push-pull rod 6. In this embodiment, the coincidence can be complete or approximately coincident. The fixed connection between the shaft hole and the distal end of the push-pull rod 6 can be achieved by, but is not limited to, welding. In some embodiments, the second gathering portion 5 can also be a columnar structure in which the proximal ends of each metal wire are gathered and compressed together. This columnar structure can be inserted into the hole at the end of the push-pull rod 6 and fixed to fix the second gathering portion 5 to the distal end of the push-pull rod 6. The push-pull rod 6 in this application can also be a solid shaft or a hollow shaft.

[0034] In one embodiment, the axial length of the circumferential side portion 2 is 3mm-30mm, and the axial length of the circumferential side portion 2 is 1 / 5 of the outer circumferential diameter of the circumferential side portion 2. This not only facilitates the smooth insertion of the puncture needle into the mesh body 9, but also promotes good elastic deformation of the mesh body. In some embodiments, the axial length of the circumferential side portion 2 and the outer circumferential diameter of the circumferential side portion 2 are not limited to the above ranges. In some embodiments, the diameter range of the distal end portion 1 and the proximal end portion 3 can also be set to 5mm-3cm.

[0035] The surgical suture capture net provided in the above embodiment includes a net body 9, which has an unfolded state and a contracted state. The contracted state is formed by the elastic deformation of the unfolded net body 9. During suturing, the puncture needle 11 is passed through the proximal end 3 to deliver the suture into the net body 9. After the puncture needle 11 is withdrawn, the push-pull rod 6 is pulled. The sheath 7 sleeved on the push-pull rod 6 will then apply a distal pushing force to the proximal end 3 of the unfolded net body 9, causing the unfolded net body 9 to undergo elastic deformation. Because the distal end 1 has an outward convex structure, the deformation will force the first gathering part 4 to move distally. This allows the unfolded net body 9 to contract into a strip-shaped net body 9, which helps to avoid the capture net getting stuck at the end of the sheath 7 and failing to completely retract into the sheath 7, ensuring the smooth progress of the surgery.

[0036] Please see Figure 5 This application embodiment also provides a surgical suture capturing device, including a push-pull rod 6 and a surgical suture capturing net as described above; the second gathering part 5 is fixed to the distal end of the push-pull rod 6, the push-pull rod 6 is used to push the capturing net out of the sheath tube 7 to form the net body 9 in an unfolded state, and the push-pull rod 6 is also used to pull the capturing net back into the sheath tube 7 to form the net body 9 in a contracted state.

[0037] The surgical suture capture net in this embodiment is the same as that in the above embodiments, and will not be described again here. The push-pull rod 6 in this embodiment can be made of a material with a certain bending stiffness and elasticity, and it can bend and deform with the bending of the sheath tube 7. The push-pull rod 6 in this embodiment can be connected and fixed to the second gathering part 5 by welding. The capture device in this embodiment may also include other structures or components, such as a capture control handle 10, and the proximal end of the push-pull rod 6 is connected to the capture control handle 10.

[0038] The surgical suture catching device provided in this embodiment includes a net body 9, which has an unfolded state and a contracted state. The contracted state is formed by the elastic deformation of the unfolded net body 9. During suturing, the puncture needle 11 is passed through the proximal end 3 to deliver the suture into the net body 9. After the puncture needle 11 is withdrawn, the push-pull rod 6 is pulled. The sheath 7 sleeved on the push-pull rod 6 will then apply a distal pushing force to the proximal end 3 of the unfolded net body 9, causing the unfolded net body 9 to undergo elastic deformation. Because the distal end 1 has an outward convex structure, the deformation will force the first gathering part 4 to move distally. This allows the unfolded net body 9 to be contracted into a strip-shaped net body 9, which helps to avoid the catching net getting stuck at the end of the sheath 7 and not being able to be completely retracted into the sheath 7, ensuring the smooth progress of the surgery.

[0039] Please see Figure 6This application also provides a suturing system, including a suturing device and a surgical suture capture device as described above; the suturing device includes a puncture needle 11 and a suture, the puncture needle 11 being used to pass through the target tissue and the proximal end 3 to deliver the suture into the mesh body 9.

[0040] The surgical suture capture device in this embodiment is the same as that in the above embodiments, and will not be described again here. The puncture needle 11 in this embodiment is not only used for puncture, but its hollow structure can also form a channel for pushing the suture. This embodiment does not impose specific limitations on the pushing of the suture; the suture can be pushed into the capture net through the puncture needle 11. The suture system in this embodiment may also include other structures or components, such as a suture control handle 12. The proximal end of the puncture needle 11 is connected to the suture control handle 12, and the proximal end of the push-pull rod 6 can pass through the suture control handle 12 and connect to the capture control handle 10. The suture system in this embodiment can be used for, but is not limited to, interventional treatment of patent foramen ovale.

[0041] The suturing system provided in this embodiment includes a mesh body 9, which has an unfolded state and a contracted state. The contracted state is formed by the elastic deformation of the unfolded mesh body 9. During suturing, the puncture needle 11 is passed through the proximal end 3 to deliver the suture into the mesh body 9. After the puncture needle is withdrawn, the push-pull rod 6 is pulled. The sheath 7 sleeved on the push-pull rod 6 will then apply a distal pushing force to the proximal end 3 of the unfolded mesh body 9, causing the unfolded mesh body 9 to undergo elastic deformation. Because the distal end 1 has an outward convex structure, the deformation will force the first gathering part 4 to move distally. This allows the unfolded mesh body 9 to be contracted into a strip-shaped mesh body 9, which helps to avoid the capture net getting stuck at the end of the sheath 7 and failing to be completely retracted into the sheath 7, ensuring the smooth progress of the operation.

[0042] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the ideas presented.

Claims

1. A surgical suture catching net, characterized in that, include: The main body of the net is made of woven and bundled metal wires; The net body includes a first gathering part and a second gathering part, the second gathering part being used to fix the distal end of the push-pull rod. The net body has an unfolded state and a contracted state. The contracted state is formed by the elastic deformation of the net body in the unfolded state. The net body in the contracted state is strip-shaped. The unfolded mesh body has a cavity, which is formed by a distal end, a proximal end, and a circumferential side portion connecting the distal end and the proximal end. The distal end has an outward convex structure. The first gathering portion is located in the middle of the distal end. The proximal end is used for a puncture needle to pass through to deliver the suture into the mesh body. The second gathering portion is located in the middle of the proximal end. The second gathering portion is used to be pulled proximally by the push-pull rod so that the proximal end is pushed distally, and the first gathering portion is forced to move distally, shrinking the unfolded mesh body into a strip-shaped mesh body.

2. The surgical suture catching net according to claim 1, wherein, The distal end has a conical outward convex structure, and the angle between the line connecting the center of the first converging portion and the center of the second converging portion and the distal end is a first angle, which is less than 90 degrees.

3. The surgical suture catching net according to claim 2, wherein, The first included angle is 30 degrees to 85 degrees.

4. The surgical suture catching net according to claim 1, wherein, The proximal end is conical, and the angle between the line connecting the center of the first converging portion and the center of the second converging portion and the proximal end is a second angle, which is greater than 90 degrees.

5. The surgical suture catching net according to claim 4, wherein, The second included angle is 100 degrees to 150 degrees.

6. The surgical suture catching net according to any one of claims 1-5, wherein, The metal wire is a shape memory alloy with elasticity; The main body of the net is woven from multiple strands of the metal wires, and one end of each strand of the metal wires is gathered to form a shaft-shaped second gathering portion. The line connecting the center of the first gathering portion and the center of the second gathering portion coincides with the central axis of the second gathering portion.

7. The surgical suture catching net according to claim 6, wherein, One end of each of the multiple strands of metal wire is gathered and enclosed to form a second gathering portion with a shaft hole, which is used for inserting and fixing the distal end of the push-pull rod. The line connecting the center of the first gathering portion and the center of the second gathering portion coincides with the central axis of the shaft hole.

8. The surgical suture catching net according to any one of claims 1-5, wherein, The axial length of the circumferential side portion is 3mm-30mm, and the axial length of the circumferential side portion is 1 / 5 of the outer circumferential diameter of the circumferential side portion.

9. A surgical suture catching device, characterized in that Includes a push-pull lever and a surgical suture capture net as described in any one of claims 1-8; The second converging part is fixed to the distal end of the push-pull rod. The push-pull rod is used to push the capture net out of the sheath tube to form the net body in the unfolded state. The push-pull rod is also used to pull the capture net back into the sheath tube to form the net body in the contracted state.

10. A suturing system characterized by, The device includes a suturing apparatus and a surgical suture catching device as described in claim 9; the suturing apparatus includes a puncture needle and a suture, the puncture needle being used to pass through the target tissue and the proximal end to deliver the suture into the mesh body.

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