A device for grasping sutures

Abstract

A device for grabbing sutures comprises a capture net, a connecting tube, a connector, a support member, and a connecting wire. The capture net has a retracted state and an expanded state. The connecting tube is connected to one end of the capture net. The connector is connected to the other end of the capture net. The support member has a hollow passageway connected to the connecting tube, one end of the support member is connected to the connecting tube, and the other end of the support member is a free end. The support member is located within the capture net, and the free end of the support member is used to engage with the connector on the capture net in the expanded state. One end of the connecting wire is connected to the connector, and the other end is located outside the connecting tube. The connecting wire is used to move axially along the connecting tube to switch the capture net between the retracted state and the expanded state. The state switching of the capture net is achieved by the connecting wire, so that the capture net can grab sutures.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a device for grasping sutures. Background Art

[0002] Patent foramen ovale is a congenital heart structural abnormality. It is a disease caused by the failure of a heart channel that should close naturally after birth. The foramen ovale is located between the left and right atria during fetal development and is used to conduct the mother's umbilical vein blood for fetal development. The foramen ovale usually closes completely two months after birth. Patent foramen ovale affects one in four adults and is one of the most common congenital heart abnormalities in adults. Based on the diameter of the foramen ovale, it can be further divided into three types: large patent foramen ovale (≥4.0mm), medium patent foramen ovale (2.0-3.9mm) and small patent foramen ovale (≤1.9mm).

[0003] Most patients do not experience obvious symptoms due to the small amount of blood shunted within the heart. However, if the right atrial pressure exceeds that of the left atrial pressure due to various reasons, such as strenuous exercise, coughing, or diving, a patent foramen ovale can cause significant right-to-left abnormal shunt, leading to clinical syndromes such as paradoxical embolism and symptoms such as unexplained headaches, dizziness, dyspnea, or limb weakness.

[0004] In recent years, interventional suturing has been a common method for treating patent foramen ovale. However, because interventional procedures are performed at the distal end of a blood vessel, delivering medical devices for treatment presents significant challenges in suturing the heart over long distances. A key challenge is catching the suture during the suturing process, and currently, no suture catching device exists. Clinically available devices for catching foreign bodies are primarily designed for larger objects and are incapable of catching sutures smaller than 1 mm. Therefore, a device capable of catching sutures is crucial. Summary of the Invention

[0005] The present application provides a device for grabbing sutures, the main purpose of which is to achieve grabbing of sutures.

[0006] An embodiment of the present application provides a device for grabbing sutures, comprising:

[0007] A catching net having a contracted state and an expanded state;

[0008] A connecting pipe having a head end and a tail end, wherein the tail end is connected to one end of the catching net;

[0009] A connecting piece connected to the other end of the catching net;

[0010] a support member having a hollow passage communicating with the connecting tube, one end of the support member being connected to the tail end, the other end of the support member being a free end, and the support member being located within the capture net, the free end of the support member being configured to abut or sleeve against the connecting member on the capture net in the expanded state; and

[0011] A connecting wire, one end of which passes through the connecting tube and the support member into the catching net and is connected to the connecting member or the catching net at the connecting member, and the other end of which is located outside the connecting tube, and the connecting wire is used to move axially along the connecting tube to switch the catching net between the contracted state and the expanded state.

[0012] Wherein, the catching net is strip-shaped in the contracted state and column-shaped in the expanded state; and / or the supporting member is tubular.

[0013] In which, the support member includes a plurality of support petals adjacent to each other in the circumferential direction, the support petals are elastic, and the support member has a storage state and a support state. In the storage state, the plurality of support petals are enclosed to form a tubular structure, and in the support state, the plurality of support petals are radially spread out into an umbrella-shaped structure.

[0014] In which, the support member includes an inner tube and an outer tube that are connected to each other, the inner tube is used to abut or connect with the connecting member on the capture net in the expanded state, and the outer tube includes a plurality of support petals adjacent to each other in the circumferential direction, and the support petals are elastic. The support member has a storage state and a support state. In the storage state, the plurality of support petals are enclosed to form a tubular structure, and in the support state, the plurality of support petals are radially spread out into an umbrella-shaped structure.

[0015] The feature of the invention is that the length of the support member is 3mm-15mm.

[0016] In which, the capture net includes a first network segment and a second network segment, the first network segment is located on the side away from the connecting pipe, and the second network segment is located on the side close to the connecting pipe. Multiple support bars are provided in the first network segment or the second network segment, and any one end of the multiple support bars is fixed to the first network segment or the second network segment, and the other end of the multiple support bars is a free end. The support bars are used to play a supporting role between the first network segment and the second network segment when the capture net is in the unfolded state.

[0017] The number of braided strands of the capture net is 12-108; and / or the capture net is a single-layer net or a multi-layer net; and / or the capture net is elastic.

[0018] Wherein, the capture net is a double-layer net; the weaving density of the net far away from the connecting tube in the double-layer net is greater than the weaving density of the net close to the connecting tube in the double-layer net.

[0019] The capture net further includes a transfer tube, one end of which is connected to any one layer of the double-layer net, and the other end of which is connected to the other layer of the double-layer net.

[0020] The number of braided wire strands of the capture net is 12-108, the diameter of the braided wire is 0.08mm-0.2mm, and the inner diameter of the tail end of the connecting tube is 1mm-1.5mm.

[0021] In which, the connecting tube includes a first connecting tube and a second connecting tube connected to each other, the end of the first connecting tube away from the second connecting tube is respectively connected to the catching net and the support member, and the outer diameter of the first connecting tube is smaller than the outer diameter of the second connecting tube; and / or, the side of the connecting member close to the connecting wire is provided with a groove for accommodating the connecting wire and the support member.

[0022] The second connecting tube includes a rigid tube and a flexible tube connected to each other, one end of the rigid tube away from the flexible tube is connected to the first connecting tube, and the length of the rigid tube is shorter than that of the flexible tube.

[0023] In which, a developing part is provided on the connecting tube; and / or, the device also includes a grabbing handle, a push-pull part and a locking structure; a first channel and a second channel are provided in the grabbing handle, the head end of the connecting tube is fixed in the first channel, part of the push-pull part can be moved into the second channel, and the rest of the push-pull part is located outside the grabbing handle; the end of the connecting wire away from the catching net is connected to the push-pull part in the second channel, and the push-pull part is used to push or pull the connecting wire to realize the state switching of the catching net; the locking structure is used to lock the position of the push-pull part.

[0024] It also includes a guide tube, which is fixed to the second channel in the grab handle. Along the axial direction of the connecting tube, the guide tube includes a first tube body, a second tube body and a third tube body connected in sequence. The first tube body and the third tube body are both tapered tubes. From the side away from the second tube body to the side close to the second tube body, the diameters of the first tube body and the second tube body are continuously reduced, and the diameter of the second tube body is adapted to the diameter of the connecting wire.

[0025] According to the suture-grabbing device of the aforementioned embodiment, the connectors connect the ends of the capture net, ensuring the structural stability of the net. The support members provide support for the deployed capture net, ensuring the net's thickness and space, and preventing the net from collapsing when tightened solely by its own self-tension, which could lead to a loss of the required thickness and space. The connectors allow the capture net to be switched between different positions, further facilitating its suture-grabbing function. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the cross-sectional structure of the grabbing device in the embodiment of the present application;

[0027] Figure 2 This is a schematic diagram of the three-dimensional structure of the support member in the embodiment of the present application;

[0028] Figure 3 This is a schematic diagram of the planar structure of the capture net in the embodiment of the present application;

[0029] Figure 4 Schematic diagram of the planar structure of the gripping device in the embodiment of the present application (1);

[0030] Figure 5 Schematic diagram of the planar structure of the gripping device in the embodiment of the present application (II);

[0031] Figure 6 Schematic diagram of the three-dimensional structure of the capture net in the embodiment of the present application (1);

[0032] Figure 7 Schematic diagram of the three-dimensional structure of the capture net in the embodiment of the present application (II);

[0033] Figure 8 Schematic diagram of the cross-sectional structure of the connecting pipe in the embodiment of the present application;

[0034] Figure 9 This is a schematic diagram of the planar structure of the second connecting pipe in the embodiment of the present application;

[0035] Figure 10 This is a schematic diagram of the three-dimensional structure of the guide tube in the embodiment of the present application;

[0036] Figure 11 This is a schematic diagram of the three-dimensional structure of the grabbing device and the suturing device used in conjunction with each other in an embodiment of the present application;

[0037] Figure 12 This is a schematic diagram of the planar structure of the grabbing device and the stapler used in conjunction with each other in an embodiment of the present application;

[0038] Figure 13 Schematic diagram of the working principle of the grabbing device in the embodiment of the present application (1);

[0039] Figure 14 Schematic diagram of the working principle of the grabbing device in the embodiment of the present application (II);

[0040] Figure 15 Schematic diagram of the working principle of the grabbing device in the embodiment of the present application (3);

[0041] Figure 16 Schematic diagram (four) of the working principle of the grabbing device in the embodiment of the present application;

[0042] Figure 17 Schematic diagram of the working principle of the grabbing device in the embodiment of the present application (V);

[0043] Figure 18 Schematic diagram (six) of the working principle of the grabbing device in the embodiment of the present application;

[0044] Figure 19 Schematic diagram of the working principle of the grabbing device in the embodiment of the present application (VII);

[0045] Figure 20 Schematic diagram of the working principle of the grabbing device in the embodiment of the present application (eight);

[0046] Figure 21 Schematic diagram (9) of the working principle of the gripping device in the embodiment of the present application.

[0047] Explanation of reference numerals: 100. Grabbing device, 10. Grabbing net, 11. First net segment, 12. Second net segment, 13. Support bar, 14. First net body, 15. Second net body, 16. Transfer tube, 20. Connecting tube, 21. Head end, 22. Tail end, 23. First connecting tube, 231. Outlet, 24. Second connecting tube, 241. Inlet, 242. Rigid tube, 243. Flexible tube, 25. Developing member, 30. Connecting member, 40. Support member, 41. Inner tube, 42. Outer tube, 421. Support flap, 422. Outer tube body, 50. Connecting wire, 60. Grasping handle, 61. First channel, 62. Second channel, 63. Locking hole, 70. Push-pull member, 80. Locking structure, 90. Guide tube, 91. First tube body, 92. Second tube body, 93. Third tube body, 200. Suturing device, 210. Suturing handle, 220. Main tube, 230. Mesh storage tube, 240. Puncture needle, 250. Suture, 300. Foramen ovale. DETAILED DESCRIPTION

[0048] The present application will be further described in detail below through specific embodiments in conjunction with the accompanying drawings, wherein similar elements in different embodiments are numbered with similar elements.

[0049] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various embodiments. Furthermore, the steps or actions in the method description may be reordered or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various sequences in the specification and drawings are provided solely for the purpose of clearly describing a particular embodiment and are not intended to be mandatory, unless otherwise specified.

[0050] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).

[0051] The suture grasping device designed in this application is used in conjunction with a suture device to grasp the suture in the suture device. A specific application scenario is illustrated using the human heart foramen ovale closure surgery as an example. In addition to structural heart surgery, the suture grasping device can also be used in other areas requiring suturing, such as arteriovenous suture surgery.

[0052] like Figures 1-12 As shown, an embodiment of the present invention provides a device for grabbing sutures, including: a grabbing net 10, a connecting tube 20, a connecting member 30, a supporting member 40 and a connecting wire 50.

[0053] The capture net 10 has a retracted state and an expanded state.

[0054] The connecting pipe 20 has a head end 21 and a tail end 22, and the tail end 22 is connected to one end of the catching net 10. The connecting piece 30 is connected to the other end of the catching net 10.

[0055] The support member 40 has a hollow passage connected to the connecting tube 20. One end of the support member 40 is connected to the tail end 22, and the other end of the support member 40 is a free end. The support member 40 is located in the capture net 10. The free end of the support member 40 is used to abut or sleeve against the connecting member 30 on the capture net 10 in the unfolded state.

[0056] One end of the connecting wire 50 passes through the connecting tube 20 and the support member 40 and enters the capture net 10. It is connected to the connection member 30 or the capture net 10 at the connection member 30. For example, the connecting wire 50 and the connection member 30 are fixedly connected. The other end of the connecting wire 50 is located outside the connecting tube 20. The connecting wire 50 is used to move along the axial direction of the connecting tube 20 to switch the capture net 10 between a retracted state and an expanded state.

[0057] The suture-grabbing device (hereinafter referred to as the suture-grabbing device 100) of the embodiment of the present invention connects the ends of the suture net 10 via the connector 30, ensuring the structural stability of the suture net 10. The support member 40 provides support for the suture net 10 in its unfolded state, ensuring the sufficient thickness of the suture net 10 and preventing the suture net 10 from collapsing when tightened solely due to its own self-tension, thereby preventing the suture net 10 from being able to maintain its sufficient thickness. The connecting thread 50 allows the suture net 10 to be switched between different states, thereby facilitating the suture-grabbing function of the suture net 250.

[0058] More preferably, in this embodiment of the present invention, the length of the support member 40 is 3 mm to 15 mm, where the length refers to the length along the axial direction of the connecting tube 20. The material of the support member 40 can be, for example, stainless steel with a certain degree of rigidity. Due to the support function of the support member 40 for the capture net 10 in the deployed state, the length of the support member 40 can be equivalent to the thickness of the capture net 10 in the deployed state. The thickness is set within this range to ensure safety under X-ray during needle removal (the capture net 10 is made of metal, and only the metal instrument or plastic material with metal added can be seen under X-ray, that is, the capture net 10 can be seen, but not the internal tissue of the heart). If the length of the support member 40 is less than 3 mm, that is, the thickness of the capture net 10 is less than 3 mm, the needle body can easily pass through the capture net 10 during needle removal, thereby puncturing surrounding tissue and causing harm to the patient. When the thickness of the capture net 10 exceeds 15 mm, due to the size of the human heart atrium, it will be difficult to deploy the capture net 10. Furthermore, the radial rigidity of the capture net 10 will be weakened, which is detrimental to both practicality and safety. Therefore, only when the thickness of the capture net 10 is between 3 mm and 15 mm can the needle remain inside the capture net 10 during needle removal, and is unlikely to contact other tissues of the patient, thus ensuring safety. The deployed capture net 10, for example, is cylindrical. In other embodiments, the shape of the capture net 10 in the unfolded state may also be elliptical or other special shapes.

[0059] Specifically, in an embodiment of the present invention, the capture net 10 is strip-shaped in the collapsed state, facilitating its storage and movement. In the expanded state, the capture net 10 is cylindrical, providing ample space for the puncture needle 240 in the suturing device 200 to operate, preventing the puncture needle 240 from penetrating into undesirable tissue. Furthermore, the cylindrical shape of the capture net 10 facilitates contact with and provides support for human tissue (e.g., cardiac tissue surrounding the foramen ovale 300). The capture net 10 in the expanded state is used to capture the suture 250, while the capture net 10 in the collapsed state is used to further capture the suture 250. Alternatively, the support member 40 is tubular, similar to a support tube. The design of the support member 40 can provide support for the capture net 10 in the expanded state, maintaining its cylindrical shape. The support tube can be welded to the tail end 22 of the connecting tube 20 to achieve a secure connection. The outer diameter of the support tube can be greater than, less than, or equal to the inner diameter of the connecting tube 20, and the inner diameter of the support tube can be greater than, equal to, or less than the inner diameter of the connecting tube 20, as long as it does not affect the movement of the connecting wire 50. When the support member 40 is tubular, the structure is simple and easy to process and use.

[0060] like Figure 2As shown, in other embodiments, the support member 40 includes an inner tube 41 and an outer tube 42 that are connected to each other. The inner tube 41 is used to abut or socket the connecting member 30 of the capture net 10 in the deployed state. The outer tube 42 includes an outer tube body 422 and a plurality of support petals 421 arranged adjacent to each other along the circumference. The support petals 421 are elastic. The support member 40 has a stowed state and a supporting state. In the stowed state, the plurality of support petals 421 enclose a tubular structure. In the supporting state, the plurality of support petals 421 radially spread out to form an umbrella-like structure. Specifically, the support petals 421 have fixed ends and supporting ends along the axial direction of the outer tube body 422. The fixed ends of the plurality of support petals 421 are integrally connected to the tube opening of the outer tube body 422. The supporting ends of the plurality of support petals 421 are used to contact the capture net 10 in the deployed state and provide support. Among them, a plurality of support petals 421 can be enclosed along the circumference of the outer tube body 422 to form a complete tubular structure, in which case the circumferentially adjacent support petals 421 are in contact, or a plurality of support petals 421 are distributed at intervals along the circumference of the outer tube body 422. The support petals 421 are elastic, so that when the support member 40 is placed inside the tube (at this time the capture net 10 is in a contracted state), the support member 40 is in a retracted state, and when the support member 40 is placed outside the tube (at this time the capture net 10 is in an expanded state), the support member 40 is in a supporting state, and the support petals 421 in the support member 40 can be expanded by their own elastic force to provide support for the capture net 10 in the expanded state, and at this time, support can also be provided to the capture net 10 by abutting or sleeved against the inner tube 41 and the connecting member 30. In other embodiments, if the capture net 10 does not require high support strength for the support member 40, the support member 40 can also only include Figure 2 The outer tube 42 in the.

[0061] like Figure 3-Figure 4 As shown, more preferably, in an embodiment of the present invention, the capture net 10 includes a first net segment 11 and a second net segment 12, the first net segment 11 is located on the side away from the connecting pipe 20, and the second net segment 12 is located on the side close to the connecting pipe 20, and a plurality of support bars 13 are provided in the first net segment 11 or the second net segment 12, and any one end of the plurality of support bars 13 is fixed to the first net segment 11 or the second net segment 12, and the other end of the plurality of support bars 13 is a free end, and the support bars 13 are used to play a supporting role between the first net segment 11 and the second net segment 12 when the capture net 10 is in the unfolded state. Figure 3For example, the first net segment 11 can be the upper half of the capture net 10 in the expanded state, and the second net segment 12 can be the lower half of the capture net 10 in the expanded state. One end of the support bar 13 is fixedly connected to the first net segment 11, that is, one end of the support bar 13 is connected to the top surface of the capture net 10 at this time, and the other end of the support bar 13 abuts the bottom surface of the capture net 10 to provide support. The designed support bar 13 can further enhance the support effect of the capture net 10 in the expanded state. In other embodiments, if the support effect of the capture net 10 is not required to be high, the support member 40 can be omitted and only the support bar 13 can be provided to achieve the support effect. Alternatively, one end of the support bar 13 can be fixedly connected to the second net segment 12, that is, one end of the support bar 13 is connected to the bottom surface of the capture net 10 at this time, and the other end of the support bar 13 abuts the side wall of the cylindrical capture net 10 to provide support.

[0062] In an embodiment of the present invention, the number of braided strands of the capture net 10 is 12-108; and / or the capture net 10 is a single-layer or multi-layered net; and / or the capture net 10 is elastic. The number of braided strands of the capture net 10, the number of layers of the capture net 10, and whether the capture net 10 is elastic are three technical features of the capture net 10. In actual use, only one, any two, or all three of these technical features may be present.

[0063] If the number of strands in the capture net 10 is too small, the mesh openings formed on the capture net 10 are too large, making it difficult to grasp the suture 250. If the number of strands in the capture net 10 is too large, a larger connecting tube 20 is required. However, a larger connecting tube 20 may be limited by the internal structure of the human body, making it inapplicable. In addition, the mesh openings of the capture net 10 with a large number of strands are small, making it difficult for the puncture needle 240 to pass through.

[0064] When the capture net 10 is elastic, it is easier to switch from a contracted state to an expanded state. The connecting tube 20 can be made of metal or polymer, and the net body can be made of metal or polymer. When the capture net 10 is elastic, for example, the capture net 10 is made of nickel-titanium alloy.

[0065] like Figure 3 As shown, in some embodiments, the capture net 10 is a single-layer mesh. The thickness of the single-layer mesh in the expanded state is equal to the length of the support member 40 within the capture net 10. The support member 40 ensures that the single-layer mesh has a certain thickness in the expanded state, thereby preventing the doctor from inserting the needle too far during the foramen ovale 300 closure surgery, thereby puncturing the surrounding tissue of the foramen ovale 300 and causing injury to the patient.

[0066] like Figure 6As shown, in some embodiments, the capture net 10 comprises a double-layered mesh. For ease of description, the double-layered meshes are designated as a first mesh 14 and a second mesh 15. When the capture net 10 is deployed, the first mesh 14 is shaped like a thin pancake and has a double-layered structure. The structure of the second mesh 15 is similar to that of the first mesh 14 and will not be further described here.

[0067] More preferably, the first net body 14 and the second net body 15 are an integral structure. In the unfolded state, the first net body 14 and the second net body 15 are spaced apart, and the thickness of the interval between the first net body 14 and the second net body 15 is similar to the length of the support member 40 .

[0068] More preferably, the weaving density of the mesh far away from the connecting tube 20 in the double-layer mesh is greater than the weaving density of the mesh close to the connecting tube 20 in the double-layer mesh, that is, Figure 6 In the embodiment, the braiding density of the first mesh 14 is greater than that of the second mesh 15. When the braiding density of the first mesh 14 is greater, it can better prevent the puncture needle 240 from passing through the first mesh 14, preventing the puncture needle 240 from piercing unnecessary human tissue. When the braiding density of the second mesh 15 is less, it can facilitate the puncture needle 240 from passing through the second mesh 15. For example, the number of braided strands of the first mesh 14 is 100, and the number of braided strands of the second mesh 15 is 30.

[0069] like Figure 7 As shown, preferably, the capture net 10 also includes a transfer tube 16, one end of which is connected to either layer of the double-layer mesh, and the other end of which is connected to the other layer of the double-layer mesh. Transfer tube 16 facilitates the secure connection between the first and second meshes 14, 15, while also providing support to help maintain the capture net 10 in its unfolded state. In other embodiments, the connecting tube 20 may be omitted, and the first and second meshes 14, 15 may be fabricated with different weave densities as needed, and then welded together at their adjacent ends.

[0070] When the capture net 10 is a double-layer mesh, it can be clearly seen under X-ray that when the doctor removes the needle, he only needs to pass the needle tip of the puncture needle 240 through the second mesh 15 close to the connecting tube 20 and the first mesh 14 away from the connecting tube 20. This can prevent the doctor from removing the needle too long and puncturing the surrounding tissues, causing harm to the patient.

[0071] In other embodiments, the capture net 10 can also be configured as a three-layer or four-layer net body according to needs.

[0072] In an embodiment of the present invention, when the number of braided wire strands in the capture net 10 ranges from 12 to 108, the diameter of the braided wire is 0.08 mm to 0.2 mm, and the inner diameter at the tail end 22 of the connecting tube 20 is correspondingly 1 mm to 1.5 mm. If the diameter of the braided wire is too small, it will not meet the support performance requirements of actual use. If the diameter of the braided wire is too large, a thicker connecting tube 20 will be required, which will lead to the need for a thicker conduit (i.e., a tube body that matches the connecting tube 20, such as the net body storage tube 230 described below). Therefore, the diameter of the braided wire is set to 0.08 mm to 0.2 mm. For the designed capture net 10, the inner diameter of the connecting tube 20 at the tail end 22 is limited to 1 mm to 1.5 mm, which facilitates the single-step spot welding of the multiple braided wire strands of the capture net 10 to the inner wall of the tail end 22 of the connecting tube 20. If the inner diameter of the tail end 22 of the connecting tube 20 is too large, the braided wire will need to be welded multiple times, and the braided wire is relatively brittle and easily breaks. If the inner diameter of the tail end 22 of the connecting tube 20 is too small, it is difficult to assemble multiple strands of braided wire into the connecting tube 20, which increases the difficulty of assembly and reduces production efficiency. It is understandable that the entire inner diameter of the connecting tube 20 can also be 1mm-1.5mm, or, more preferably, the inner diameter of the rest of the connecting tube 20 is relatively smaller, so as to better adapt to the diameter of the connecting wire 50, avoid the connecting wire 50 from shaking in the connecting tube 20, and affect the operation of the grasping device 100. The head end 21 of the connecting tube 20 is the wire inlet 241, which is used for the connecting wire 50 to enter the connecting tube 20, and the tail end 22 of the connecting tube 20 is the wire outlet 231, which is used for the connecting wire 50 to pass through the connecting tube 20. The inner wall of the tail end 22 of the connecting tube 20 can be a cylindrical inner wall or a tapered inner wall to provide sufficient operating space for the braided wire. The inner wall of the head end 21 of the connecting tube 20 can also be a tapered inner wall to facilitate the connecting wire 50 to pass through the connecting tube 20. Alternatively, the head end 21 and tail end 22 of the connecting tube 20 can each be configured as a shorter tapered tube to achieve their respective purposes. The three technical features of the capture net 10, namely, the number of braided strands, the diameter of the braided strands, and the inner diameter of the tail end 22 of the connecting tube 20, can be present in practice, with only one, any two, or all three features being present, depending on the application.

[0073] In other embodiments, the braided wire may be welded to the outer wall of the tail end 22 of the connecting tube 20 in addition to being welded to the inner wall of the tail end 22 of the connecting tube 20 .

[0074] like Figure 8 As shown, in an embodiment of the present invention, the connecting tube 20 includes a first connecting tube 23 and a second connecting tube 24 connected to each other, and one end of the first connecting tube 23 away from the second connecting tube 24 is respectively connected to the catching net 10 and the support member 40, and the outer diameter of the first connecting tube 23 is smaller than the outer diameter of the second connecting tube 24; and / or, a groove for accommodating the connecting wire 50 and the support member 40 is provided on the side of the connecting member 30 close to the connecting wire 50.

[0075] The connecting tube 20 includes a first connecting tube 23 and a second connecting tube 24, each of which has an outer diameter smaller than that of the second connecting tube 24. Both the first connecting tube 23 and the second connecting tube 24 are made of a rigid material, ensuring that the plane of the capture net 10 remains perpendicular to the connecting tube 20 when deployed, preventing the puncture needle 240 from being unable to fully enter the capture net 10 during the puncture process, thereby causing failure to capture the suture 250. The provision of the second connecting tube 24 further increases the rigidity of the connecting tube 20. Furthermore, because the inner diameter of the second connecting tube 24 matches the inner diameter of the mesh storage tube 230 through which it passes during suturing surgery, this prevents the capture device 100 from wobbling within the mesh storage tube 230 due to the excessively large inner diameter of the mesh storage tube 230 during use, thereby enhancing the transport performance of the capture device 100 within the mesh storage tube 230 and also improving the transport performance of the connecting wire 50. The first connecting tube 23 and the second connecting tube 24 can be fixed by plugging or welding. The inner diameters of the first connecting tube 23 and the second connecting tube 24 can be the same or different, as long as the connection between the first connecting tube 23 and the second connecting tube 24 is smooth and the connecting wire 50 can pass smoothly through the connection between the first connecting tube 23 and the second connecting tube 24.

[0076] Specifically, the connector 30 is a mortise or other cylindrical head structure. In this case, the connector 30 is fixed to one end of the capture net 10, thereby connecting the end of the capture net 10. It is understood that the connector 30 is disposed at the end of the central axis of the capture net 10. When the connector 30 is a mortise, it can be nested with the end of the support member 40 to ensure the stability of the connection between the connector 30 and the support member 40, thereby facilitating the support member 40 to provide better support for the capture net 10 in the deployed state. For example, the end of the support member 40 nests within the mortise, so that when the connecting wire 50 is tightened, the end of the support member 40 is inserted into the mortise and supports the mortise, thereby ensuring that the capture net 10 has a certain thickness in the deployed state and the internal space of the capture net 10 is not compressed.

[0077] In other embodiments, based on the function of the support member 40, one end of the support member 40 can be fixedly connected to the connector 30, and the end of the support member 40 away from the connector 30 is a free end. In other embodiments, the connector 30 can also be a sheet-like structure, such as a circular sheet-like connector 30. In this case, the connecting wire 50 can be fixedly connected to the center of the connector 30. When the connector 30 is a sheet-like structure, it can be made of an elastic material so that when the connector 30 is placed inside the tube (when the capture net 10 is in a contracted state), the connector 30 can be folded and stored. When the connector 30 is placed outside the tube (when the capture net 10 is in an expanded state), the connector 30 can be expanded by its own elastic force so as to abut against the end of the support member 40.

[0078] like Figure 9 As shown, preferably, the second connecting tube 24 includes a rigid tube 242 and a flexible tube 243 connected to each other. The end of the rigid tube 242 away from the flexible tube 243 is connected to the first connecting tube 23. The length of the rigid tube 242 is shorter than that of the flexible tube 243. For example, the length of the rigid tube 242 is 1 cm to 2 cm, while the length of the flexible tube 243 is 2 cm to 10 cm or 10 cm to 200 cm. The rigid tube 242 and the flexible tube 243 can be welded together, and the flexible tube 243 can be braided from multiple stainless steel wires. The rigid tube 242 enhances the rigidity of the second connecting tube 24, ensuring that the axis of the capture net 10 and the second connecting tube 24 are perpendicular when deployed. The flexible tube 243 facilitates movement and bending of the connecting tube 20 within the human body, and also facilitates alignment with the foramen ovale 300 for suturing surgery.

[0079] like Figure 5 As shown, a developing member 25 is provided on the connecting tube 20, for example, a developing ring or a printing developing material is sleeved on the outer wall of the connecting tube 20 and on the side close to the catching net 10, so as to more clearly obtain the position of the catching net 10; and / or Figure 1As shown, the grabbing device 100 also includes a grabbing handle 60, a push-pull member 70, and a locking structure 80. The grabbing handle 60 includes a first channel 61 and a second channel 62 interconnected therein. The head end 21 of the connecting tube 20 is fixed within the first channel 61. Some push-pull members 70 are removably positioned within the second channel 62, while the remaining push-pull members 70 are located outside the grabbing handle 60. The end of the connecting wire 50, away from the capture net 10, is connected to the push-pull member 70 within the second channel 62. The push-pull member 70 is used to push or pull the connecting wire 50 to switch the capture net 10 state. The locking structure 80 is used to lock the position of the push-pull member 70. The push-pull member 70 can be, for example, a push-pull rod, and the end of the connecting wire 50 can be embedded and fixed to the push-pull rod. The locking structure 80 can be, for example, a locking knob. A locking hole 63 is defined on the inner wall of the grabbing handle 60. The locking knob is threadedly connected to the locking hole 63. Rotating the locking knob locks or unlocks the push-pull member 70. In other embodiments, the locking structure 80 may also be a meshing tooth portion between the grab handle 60 and the push-pull member 70. There is no limitation on the specific form of the locking structure 80, as long as it can achieve the locking and unlocking functions.

[0080] like Figure 10 As shown, more preferably, in an embodiment of the present invention, the grasping device 100 further includes a guide tube 90, which is fixed to the second channel 62 in the grasping handle 60. Along the axial direction of the connecting tube 20, the guide tube 90 includes a first tube body 91, a second tube body 92, and a third tube body 93 connected in sequence. The first tube body 91 and the third tube body 93 are both tapered tubes. From the side away from the second tube body 92 to the side close to the second tube body 92, the diameters of the first tube body 91 and the third tube body 93 gradually decrease. The diameter of the second tube body 92 is adapted to the diameter of the connecting wire 50. The second tube body 92 can provide support for the connecting wire 50, and the first tube body 91 or the third tube body 93 can provide a guiding function to facilitate the connecting wire 50 to pass through the second tube body 92 and the connecting tube 20. The connecting wire 50 can be made of metal, such as a harder metal, to further ensure the structural stability of the connecting wire 50.

[0081] like Figure 11-12 and Figure 16The suture device 200 includes a suturing handle 210, a main body tube 220, a mesh storage tube 230, multiple puncture needles 240 and multiple sutures 250. The main body tube 220 has a first chamber and multiple second chambers. The mesh storage tube 230 is fixed in the first chamber, the puncture needle 240 is fixed in the second chamber, and the suture 250 is arranged in the puncture needle 240 in the initial state. The number of puncture needles 240, sutures 250 and second chambers is the same, for example, they are all configured as four. The suture device 200 mentioned here in the present invention is an existing structure, so the specific structure of the suture device 200 will not be described in detail. When the grabbing device 100 is actually used, the grabbing device 100 needs to be used in conjunction with the suturing device 200. The strip-shaped grabbing net 10 and the connecting tube 20 can be inserted into the net storage tube 230 from the tail of the suturing handle 210 and pass out from the other end of the net storage tube 230. After the grabbing net 10 passes through the net storage tube 230, the state switching can be achieved through the connecting wire 50.

[0082] The following combination Figure 13-Figure 21 The following describes the operating principle of the grasping device 100 designed in the present invention. Taking the foramen ovale closure surgery as an example, the specific operating principle of the grasping device 100 is as follows:

[0083] like Figure 13 As shown, the capture net 10 is in a contracted state, the capture net 10 and part of the connecting tube 20 are placed in the net body storage tube 230, and the push-pull member 70 is in a locked state.

[0084] like Figure 14 As shown, the suture device 200 is operated to allow the mesh storage tube 230 to enter the human body and pass through the foramen ovale 300 at the heart. After the mesh storage tube 230 passes through the foramen ovale 300, the entire grasping device 100 is first advanced so that the strip-shaped capture net 10 is completely placed outside the mesh storage tube 230. The push-pull member 70 is then released from its locked state and the push-pull member 70 is operated to pull the connecting wire 50 outward, i.e., move the connecting wire 50 toward the push-pull member 70, causing the capture net 10 to be deployed, and the connecting member 30 to be nested with the support member 40 within the capture net 10. After the capture net 10 is deployed, the push-pull member 70 is locked by the locking structure 80.

[0085] like Figure 15 As shown, the needles are removed, and by operating the stapler 200 , the four puncture needles 240 pass through the second chamber and through the human tissue around the foramen ovale 300 to be sutured.

[0086] like Figure 16 As shown, after the needle is removed, the needle head of the puncture needle 240 penetrates into the capture net 10, and the suture device 200 is continued to be operated to realize the thread removal. The suture 250 first passes through the puncture needle 240 and then passes through the capture net 10, and part of the suture 250 is placed on the outside of the capture net 10.

[0087] like Figure 17 As shown, the needle is retracted and the puncture needle 240 is withdrawn through the stapler 200.

[0088] like Figure 18 As shown, the puncture needle 240 is completely received in the second chamber, leaving only the suture 250 .

[0089] like Figure 19 As shown, the locking structure 80 is operated to release the locking state of the push-pull member 70, and the connecting wire 50 is pushed inward by the push-pull member 70, that is, the connecting wire 50 is pushed to the side away from the push-pull member 70, so that the catching net 10 changes from the expanded state to the contracted state, and then the locking structure 80 is operated to make the push-pull member 70 in the locked state, and then the grabbing handle 60 is used to pull the entire grabbing device 100 outward along the axis of the net body storage tube 230, that is, pull it toward the side close to the grabbing handle 60, wherein the state switching of the catching net 10 will cause the relatively free end of the suture 250 thereon to bend, and be received into the net body storage tube 230 together with the catching net 10.

[0090] like Figure 20 As shown, the grabbing device 100 continues to be pulled outward along the axis of the net storage tube 230, so that part of the suture 250 continues to move outward in the net storage tube 230 along with the capture net 10.

[0091] like Figure 21 As shown, continue to pull the grasping device 100 outward along the axis of the mesh receiving tube 230 until the grasping device 100 is completely withdrawn from the mesh receiving tube 230 in the suture device 200, and the state of the suture 250 after being finally grasped is as shown in FIG. Figure 21 shown.

[0092] The grasping device 100 in the above embodiment designed by the present invention can grasp sutures during the interventional surgery when performing the foramen ovale 300 closure surgery, and has certain convenience and safety in use.

[0093] The above specific examples are used to illustrate the present application, which is only used to help understand the present application and is not intended to limit the present application. For those skilled in the art of the present application, based on the concept of the present application, they can also make some simple deductions, modifications or substitutions.

Claims

1. A device for grasping sutures, characterized in that: include: A catching net having a contracted state and an expanded state; A connecting pipe having a head end and a tail end, wherein the tail end is connected to one end of the catching net; A connecting piece connected to the other end of the catching net; a support member having a hollow passage communicating with the connecting tube, one end of the support member being connected to the tail end, the other end of the support member being a free end, and the support member being located within the capture net, the free end of the support member being configured to abut or sleeve against the connecting member on the capture net in the expanded state; as well as A connecting wire, one end of which passes through the connecting tube and the support member into the catching net and is connected to the connecting member or the catching net at the connecting member, and the other end of which is located outside the connecting tube, and the connecting wire is used to move axially along the connecting tube to switch the catching net between the contracted state and the expanded state.

2. The device for grabbing sutures according to claim 1, wherein The catching net is strip-shaped in the contracted state and column-shaped in the expanded state; and / or the supporting member is tubular.

3. The device for grabbing sutures according to claim 2, wherein The support member includes a plurality of support petals adjacent to each other in the circumferential direction, and the support petals are elastic. The support member has a storage state and a support state. In the storage state, the plurality of support petals are enclosed to form a tubular structure. In the support state, the plurality of support petals are radially spread out to form an umbrella-shaped structure.

4. The device for grabbing sutures according to claim 1, wherein The support member includes an inner tube and an outer tube that are connected to each other. The inner tube is used to abut or connect with the connecting member on the capture net in the expanded state. The outer tube includes a plurality of support petals adjacent to each other in the circumferential direction. The support petals are elastic. The support member has a retracted state and a supporting state. In the retracted state, the plurality of support petals are enclosed to form a tubular structure. In the supporting state, the plurality of support petals are radially spread out into an umbrella-shaped structure.

5. The device for grabbing sutures according to any one of claims 1 to 4, characterized in that The length of the support member is 3mm-15mm.

6. The device for grasping sutures according to any one of claims 1 to 4, characterized in that The capture net includes a first net segment and a second net segment, the first net segment is located on a side away from the connecting pipe, and the second net segment is located on a side close to the connecting pipe. Multiple support bars are provided in the first net segment or the second net segment, and any one end of the multiple support bars is fixed to the first net segment or the second net segment, and the other end of the multiple support bars is a free end. The support bars are used to play a supporting role between the first net segment and the second net segment when the capture net is in an unfolded state.

7. The device for grabbing sutures according to claim 1, wherein The number of braided strands of the capture net is 12-108 strands; and / or the capture net is a single-layer net or a multi-layer net; and / or the capture net is elastic.

8. The device for grasping sutures according to claim 7, characterized in that The capture net is a double-layer net; the weaving density of the net far away from the connecting tube in the double-layer net is greater than the weaving density of the net close to the connecting tube in the double-layer net.

9. The device for grasping sutures according to claim 8, characterized in that The capture net further comprises a transfer tube, one end of which is connected to any one layer of the double-layer net body, and the other end of which is connected to the other layer of the double-layer net body.

10. The device for grasping sutures according to claim 7, wherein The number of braided wire strands of the capture net is 12-108, the diameter of the braided wire is 0.08mm-0.2mm, and the inner diameter of the tail end of the connecting tube is 1mm-1.5mm.

11. The device for grasping sutures according to claim 1, wherein The connecting tube includes a first connecting tube and a second connecting tube connected to each other, wherein one end of the first connecting tube away from the second connecting tube is respectively connected to the catching net and the support member, and the outer diameter of the first connecting tube is smaller than the outer diameter of the second connecting tube; and / or, a groove for accommodating the connecting wire and the support member is provided on the side of the connecting member close to the connecting wire.

12. The device for grasping sutures according to claim 11, wherein The second connecting pipe includes a rigid pipe and a flexible pipe connected to each other. One end of the rigid pipe away from the flexible pipe is connected to the first connecting pipe. The length of the rigid pipe is shorter than that of the flexible pipe.

13. The device for grasping sutures according to claim 1, wherein A developing part is provided on the connecting tube; and / or the device further comprises a grabbing handle, a push-pull part and a locking structure; a first channel and a second channel are provided in the grabbing handle, the head end of the connecting tube is fixed in the first channel, part of the push-pull part can be moved into the second channel, and the rest of the push-pull part is located outside the grabbing handle; the end of the connecting wire away from the catching net is connected to the push-pull part in the second channel, and the push-pull part is used to push or pull the connecting wire to achieve the state switching of the catching net; the locking structure is used to lock the position of the push-pull part.

14. The device for grasping sutures according to claim 13, wherein It also includes a guide tube, which is fixed to the second channel in the grab handle. Along the axial direction of the connecting tube, the guide tube includes a first tube body, a second tube body and a third tube body connected in sequence. The first tube body and the third tube body are both tapered tubes. From the side away from the second tube body to the side close to the second tube body, the diameters of the first tube body and the second tube body continuously decrease, and the diameter of the second tube body is adapted to the diameter of the connecting wire.

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