Tissue clamping system

Abstract

The present application relates to a kind of tissue clamping systems, including tissue clamping instrument and driving component, tissue clamping instrument includes clamping part, first support part, second support part and constraint part, clamping part includes at least two support arms and with at least two clamping arms one-to-one corresponding at least two support arms, at least two support arms are arranged on first support part, at least two clamping arms are arranged on second support part, second support part includes guide piece, constraint part is threaded first support part and is fixedly connected with first support part, driving component is threaded constraint part and driving component is detachably connected with second support part, driving component is used to drive at least two support arms relative constraint part and be radially unfolded or closed, make at least two clamping arms relative constraint part and be radially unfolded or closed;In closed state, the distal end of constraint part is housed in guide piece, so that in the instant that support arm is just unfolded, the distal end of constraint part is housed in the guide piece.The clamping effect of the tissue clamping system is better.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and in particular to a tissue clamping system. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Mitral valve disease is a common condition among the elderly. Transcatheter mitral valve repair products are currently available on the market.

[0004] Existing transcatheter mitral valve repair products all operate on the principle of using a clamping device to clamp the anterior and posterior leaflets of the mitral valve, reducing the valve opening area and thus treating regurgitation. Some existing products use mechanically locked clamping devices, which require unlocking during interventional procedures to perform the clamping operation, making the procedure complex. Furthermore, because they are mechanically locked, the clamping stress is uncontrollable, leading to significant damage to the valve leaflets. To avoid this problem, some products employ an elastic clamping method, clamping the leaflets between elastic clamping arms to alleviate clamping stress and reduce leaflet damage. Before leaflet capture, a mechanism is needed to open the elastic clamping arms. These elastic clamping arms have a degree of flexibility and poor stability, potentially leading to misalignment during opening and affecting the final valve clamping effect.

[0005] To address the aforementioned problems, those skilled in the art would readily conceive of improving and optimizing the elastic clamping arm. However, the clamping effect still requires further optimization. Summary of the Invention

[0006] Therefore, it is necessary to provide a tissue clamping system with better clamping effect.

[0007] A tissue clamping system includes a tissue clamping device and a driving component. The tissue clamping device includes a clamping portion, a first support portion, a second support portion, and a restraining portion. The clamping portion includes at least two support arms and at least two clamping arms corresponding to the at least two support arms. The at least two support arms are disposed on the first support portion, and the at least two clamping arms are disposed on the second support portion. The second support portion includes a guide member. The restraining portion passes through the first support portion and is fixedly connected to the first support portion. The driving component passes through the restraining portion and is detachably connected to the second support portion. The driving component is used to drive the at least two support arms to expand or close radially relative to the restraining portion, so that the at least two clamping arms expand or close radially relative to the restraining portion. In the closed state, the distal end of the restraining portion is received in the guide member, such that at the instant the support arm expands, the distal end of the restraining portion is received in the guide member.

[0008] In one embodiment, when the included angle between the two support arms is 60° to 150°, the distal end of the constraint portion is housed in the guide member.

[0009] In one embodiment, when the included angle between the two support arms is 120°, the distal end of the constraint portion is received in the guide.

[0010] In one embodiment, the tissue clamping device further includes a sealing portion fitted onto the restraining portion.

[0011] In one embodiment, one end of the support arm is rotatably connected to the first support portion, one end of the clamping arm is fixedly connected to the second support portion, and the other end of the support arm is rotatably connected to the other end of the clamping arm.

[0012] In one embodiment, the support arm includes a curved section and a straight section, one end of the curved section being fixedly connected to the straight section and the other end being rotatably connected to the clamping arm; or, one end of the curved section being fixedly connected to the straight section and the end of the straight section away from the curved section being rotatably connected to the clamping arm.

[0013] In one embodiment, the curved segment is bent in the closed position, and the degree of bending of the curved segment increases as the clamping arm and the support arm move from the closed position to the open position.

[0014] In one embodiment, the clamping arm includes a connecting section and two support sections. The two ends of the connecting section are respectively connected to the two support sections, and the end of the connecting section is the free end of the clamping arm. Each support section includes a bending segment and an extension segment. One end of the bending segment is connected to the extension segment, and the other end is connected to the connecting section. The end of the bending segment away from the extension segment is not in the same plane as the extension segment, so that the connecting section is away from the axial central axis of the tissue clamping device.

[0015] In one embodiment, the extension segment includes a curved rod and a straight rod connected to the curved rod, with one end of the curved rod away from the straight rod connected to the curved segment.

[0016] In one embodiment, there are two clamping arms. In the closed state, the connection between the bent rod and the bent segment of one clamping arm abuts against the connection between the bent rod and the bent segment of the other clamping arm.

[0017] The aforementioned tissue clamping system is provided with a constraint part and a second support part including a guide. The driving component passes through the constraint part, and in the closed state, the distal end of the constraint part is housed in the guide. The constraint part and the guide cover the driving component, which can form a good constraint and reinforcement effect on the driving component. This is beneficial to the stability of the force on the support arm and the clamping arm at the moment the support arm is just unfolded, so that no displacement occurs during subsequent further opening and closing, resulting in a better clamping effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the open state of a tissue clamping system according to an embodiment;

[0019] Figure 2 This is a schematic diagram of the closed state of a tissue clamping system according to an embodiment;

[0020] Figure 3 This is a schematic diagram showing the connection state of the support arm and the clamping arm in one embodiment.

[0021] Figure 4 This is a schematic diagram illustrating the connection state of the support arm and clamping arm according to another embodiment.

[0022] Figure 5 This is a schematic diagram of the support arm in one embodiment;

[0023] Figure 6 This is a schematic diagram of the clamping arm in one embodiment;

[0024] Figure 7 A schematic diagram of the clamping arm from another angle in one embodiment;

[0025] Figure 8 This is a schematic diagram showing the positional relationship of the two clamping arms in the closed state according to an embodiment;

[0026] Figure 9 This is a schematic diagram of the clamping arm in one embodiment;

[0027] Figure 10 for Figure 8 A schematic diagram showing the positional relationship of the two clamping arms at another angle;

[0028] Figure 11 This is a partial structural schematic diagram of the clamping arm according to one embodiment;

[0029] Figure 12 This is a partial structural schematic diagram of the clamping arm according to one embodiment;

[0030] Figure 13 This is a schematic diagram of the open state of a tissue clamping system according to an embodiment;

[0031] Figures 14-17This is a schematic diagram of the implantation process of a tissue closure device according to one embodiment. Detailed Implementation

[0032] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0034] In the field of interventional medical devices, "distal" is defined as the end furthest from the operator during surgery, and "proximal" is defined as the end closest to the operator during surgery. "Axial" refers to the direction parallel to the line connecting the distal and proximal centers of the medical device.

[0035] Please see Figure 1 One embodiment of the tissue clamping system 1 includes a tissue clamping device 100 and a driving component 200. Figure 1 In the illustrated state, the drive component 200 is not visible, but it is represented by a dashed line to clearly illustrate the interaction between the drive component 200 and other components. The tissue clamping device 100 is used to clamp tissue, wherein the aforementioned tissue includes, but is not limited to, the leaflets of the mitral valve, the leaflets of the tricuspid valve, etc. The drive component 200 is used to drive the tissue clamping device 100, enabling the tissue clamping device 100 to move between an open position and a closed position, that is, to change between an open state and a closed state, so as to grasp and clamp the tissue. Figure 1 The status shown is that it is in the open state. Figure 2 The state shown is the closed state.

[0036] The tissue clamping device 100 includes a clamping part 10, a first support part 20, a second support part 30, and a restraint part 40.

[0037] The clamping part 10 includes at least two support arms 110 and at least two clamping arms 120 corresponding to the at least two support arms 110. Figure 1In the illustrated embodiment, there are two support arms 110 and two clamping arms 120. The two support arms 110 are disposed on the first support portion 20. Specifically, the two support arms 110 are symmetrically arranged about the axial central axis of the first support portion 20. The two clamping arms 120 are disposed on the second support portion 30. Specifically, the two clamping arms 120 are symmetrically arranged about the axial central axis of the second support portion 30. The axial central axes of the first support portion 20 and the second support portion 30 are collinear with or coincide with the axial central axis II of the tissue clamping device 100.

[0038] The axial central axis of the driving component 200 is collinear with or coincides with the axial central axis II of the tissue clamping device 100. Under the drive of the driving component 200, the two support arms 110 can be radially extended or closed relative to the axial central axis II of the tissue clamping device 100, and the two clamping arms 120 can be radially extended or closed relative to the axial central axis II of the tissue clamping device 100.

[0039] In one embodiment, one end of the support arm 110 is rotatably connected to the first support portion 20 so that, under the drive of the drive component 200, the support arm 110 can be radially extended or closed relative to the axial central axis II of the tissue clamping device 100.

[0040] In one embodiment, the support arm 110 is made of an elastic metal, such as a nickel-titanium alloy or elastic stainless steel.

[0041] In one embodiment, the support arm 110 is a sheet-like structure, a rod-like structure, or a coil structure, etc.

[0042] One end of the clamping arm 120 is fixedly connected to the second support portion 30, and the end of the support arm 110 away from the first support portion 20 is rotatably connected to the other end of the clamping arm 120, so that when the driving component 200 moves axially, the support arm 110 and the clamping arm 120 can simultaneously radiate outwards and expand or close. That is, the support arm 110 and the clamping arm 120 can be in the open position (e.g., Figure 1 (as shown) and closed position (as shown) Figure 2 (as shown) move between.

[0043] The end of the support arm 110 away from the first support portion 20 is rotatably connected to the other end of the clamping arm 120, for example, by means of a pivot, pin or hinge.

[0044] Please see Figure 3The support arm 110 includes a bent section 111 and a straight section 112. One end of the bent section 111 is fixedly connected to the straight section 112, and the other end is rotatably connected to the clamping arm 120. The end of the straight section 112 away from the bent section 111 is rotatably connected to the first support portion 20. (See also...) Figure 4 In another embodiment, one end of the curved section 111 is fixedly connected to the straight section 112, and the other end is rotatably connected to the first support portion 20. The end of the straight section 112 away from the curved section 111 is rotatably connected to the clamping arm 120.

[0045] Please see Figure 5 In one embodiment, the length of the straight section 112 is L1, and the arc length of the curved section 111 is L2 (not shown), where L2 / L1 = 1 / 5 to 1 / 3. This setting of the lengths of the straight section 112 and the curved section 111 serves two purposes: firstly, it avoids the curved section 111 from being too long, ensuring sufficient spreading force is transmitted to the clamping arm 120, i.e., ensuring the support arm 110 can provide a certain spreading force so that the clamping arm 120 can be spread open during the opening process; secondly, it avoids the curved section 111 from being too short, allowing it to further deform (bend) during the opening process, thus alleviating the problem of excessive stress.

[0046] Please continue reading. Figure 5 In one embodiment, the angle α of the bending segment 111 ranges from 10° to 45°. Within this angle range, it is ensured that under a certain force, the support arm 110 can transmit the spreading force to the clamping arm 120, and the bending segment 111 can deform to a certain extent to alleviate the problem of excessive stress. Here, angle α refers to the angle between the extension line A of the straight segment 112 and the tangent B of the bending segment 111. The tangent B intersects the extension line A at point a, which is the point of tangency of the tangent B.

[0047] When the length of the support arm 110 is fixed, the larger the angle α of the curved section 111, the smaller the capture length of the support arm 110, and the more difficult it is to capture tissue. When the angle α of the curved section 111 is too small, it is difficult to achieve the function of easily opening the clamping arm 120. Therefore, in one embodiment, the length of the straight section 112 is L1, the arc length of the curved section 111 is L2, L2 / L1 = 1 / 5 to 1 / 3, and the angle α of the curved section 111 is in the range of 10° to 45°, so that the clamping arm 120 can be opened more easily and the tissue can be captured more easily, which facilitates operation, makes the operation smooth, and helps to reduce the operation time.

[0048] In one embodiment, the support arm 110 can be an integral structure made of metal wire or sheet, which has a corresponding curved shape after heat setting treatment, forming a curved section 111 and a straight section 112.

[0049] In one embodiment, as the support arm 110 and clamping arm 120 move from the closed position to the open position, the bending degree of the bending section 111 increases. That is, when the force on the bending section 111 exceeds a certain limit, it can guide the support arm 110 to deform in the bending direction, thus playing a buffering role. When the support arm 110 deforms to a certain extent, the clamping arm 120 is easier to open.

[0050] In one embodiment, such as Figure 6 As shown, the clamping arm 120 is generally an open loop structure. For example, the clamping arm 120 can be an open loop made of nickel-titanium wire. The end of the support arm 110 connected to the clamping arm 120 is bent or coiled to wrap around the clamping arm 120, thereby achieving a rotatable connection between the support arm 110 and the clamping arm 120. This connection method allows the support arm 110 and the clamping arm 120 to pivot relative to each other through the interplay of their own structures, without the use of pivots, pins, or other connecting parts. This pivoting connection method reduces the use of pivots, pins, and other parts, and provides flexible rotation.

[0051] It is understood that the end of the support arm 110 that bends or curls to cover the clamping arm 120 can be the end of the bent section 111 that is away from the straight section 112, or it can be the end of the straight section 112 that is away from the bent section 111.

[0052] Please see Figure 7 In one embodiment, the clamping arm 120 includes two support sections 121 and a connecting section 122, both of which are metal rods. The two ends of the connecting section 122 are respectively connected to the two support sections 121, and the ends of the two support sections 121 furthest from the connecting section 122 are not connected, forming an open loop structure. The end containing the connecting section 122 is the free end of the clamping arm 120. The support arm 110 is rotatably connected to the connecting section 122.

[0053] Please refer to the following: Figure 8 In one embodiment, each support segment 121 includes a curved segment 1211 and an extension segment 1212 connected to the curved segment 1211. The end of the curved segment 1211 away from the extension segment 1212 is curved in a first direction, such that the end of the curved segment 1211 away from the extension segment 1212 and the extension segment 1212 are not in the same plane. Furthermore, because the end of the curved segment 1211 away from the extension segment 1212 is curved in the first direction, the connecting segment 122 of the clamping arm 120 is located away from the axial central axis II of the tissue clamping device 100.

[0054] like Figure 8As shown, in its natural state, the bending segment 1211 bends in the first direction, and the bending of the bending segment 1211 causes the end of the bending segment 1211 away from the extension segment 1212 to be out of the same plane as the extension segment 1212. This causes the free ends of the two clamping arms 120 to be away from the axial central axis II, that is, the two connecting segments 122 of the two clamping arms 120 are away from the axial central axis II and are in a state of mutual separation, making it easier to open the clamping arms 120. The first direction, for example, as... Figure 8 As shown, the direction can be away from the connecting segment 122 of the other clamping arm 120, and the end of the curved segment 1211 away from the extension segment 1212 is not in the same plane as the extension segment 1212.

[0055] In one embodiment, the extension segment 1212 is straight, and the portion of the extension segment 1212 connected to the curved segment 1211 is on the same plane as the extension segment 1212.

[0056] Please see Figure 9 In one embodiment, the extension segment 1212 includes a bent rod 1212A and a straight rod 1212B connected to the bent rod 1212A. The end of the bent rod 1212A away from the straight rod 1212B is connected to the bent segment 1211. Please refer to [further details omitted]. Figure 8 and Figure 10 In one embodiment, in its natural state (also the closed state), the bending rod 1212A bends in the second direction, such that the connection between the bending rod 1212A and the bending segment 1211 of one clamping arm 120 is connected to the connection between the bending rod 1212A and the bending segment 1211 of the other clamping arm 120. Figure 10 The circled portion (indicated by the X) is reliably abutted together to form a holding portion. At the holding portion, due to the elasticity of the clamping arms 120, the two clamping arms 120 provide opposing holding forces, thereby ensuring that the two clamping arms 120 are reliably abutted together. This improves the reliability of the clamping and prevents the tissue clamping device 100 from dislodging due to the contraction and relaxation of the heart. Secondly, for example, as... Figure 9 As shown, the direction can be outside the loop, that is, the center of the bending rod 1212A itself is located inside the loop.

[0057] In one embodiment, the connection between the bent rod 1212A and the bent segment 1211 of each clamping arm 120 is straight, so that the area of ​​the mutual abutment of the two clamping arms 120 is larger and the abutment is more reliable.

[0058] Please see Figure 11In one embodiment, the angle β of the bent rod 1212A is 5° to 15°, so that the connection points of the extension segments 1212 and the bent segment 1211 of the two clamping arms 120 can reliably abut together. Here, angle β refers to the angle formed by the intersection of tangents C and D of the bent rod 1212A, with the intersection point being b. Tangent C intersects the connection point of the bent rod 1212A and the straight rod 1212B, and tangent D intersects the connection point of the bent rod 1212A and the bent segment 1211.

[0059] Please see Figure 12 In one embodiment, the angle γ of the bending segment 1211 is 10° to 60° to facilitate opening the clamping arm 120. When the length of the bending segment 1211 is constant, the portion of the bending segment 1211 connected to the bending rod 1212A (i.e., the portion of the bending segment 1211 coplanar with the bending rod 1212A) is sufficiently long to maintain the clamping effect. Here, the angle γ refers to the angle between the extension line E of the connection between the bending rod 1212A and the bending segment 1211 and the tangent F of the bending segment 1211. The tangent F intersects the extension line E at point c, the intersection of the extension line E and the bending segment 1212A.

[0060] like Figure 13 As shown, the first support portion 20 and the second support portion 30 are axially opposite each other and are coaxially spaced apart.

[0061] In one embodiment, the first support portion 20 is generally columnar. The end of the support arm 110 furthest from the clamping arm 120 is rotatably connected to the first support portion 20. For example, a pivot connection is used, allowing the support arm 110 to rotate relative to the first support portion 20. A first through hole (not shown) is provided in the middle of the first support portion 20.

[0062] Please continue reading. Figure 13 The second support portion 30 includes a base 310 and a guide member 320 disposed on the base 310. The base 310 is generally cylindrical, and the guide member 320 is a hollow cylindrical structure. The guide member 320 extends axially from the side of the base 310 near the first support portion 20 toward the side near the first support portion 20. The base 310 and the guide member 320 can be an integral structure. Alternatively, the base 310 and the guide member 320 can be fixedly connected using methods known to those skilled in the art, including but not limited to welding and bonding.

[0063] The clamping arm 120 is fixedly connected to the second support portion 30 at one end away from the support arm 110. Specifically, the clamping arm 120 is connected to the base 310 of the second support portion 30 via the support section 121. The end of the straight rod 1212B of the support section 121 away from the bent rod 1212A is fixedly connected to the base 310.

[0064] Please continue reading. Figure 13 The constraint part 40 is a hollow tube. The constraint part 40 passes through the first through hole of the first support part 20 and is fixedly connected to the first support part 20. The constraint part 40 extends out of the first support part 20, such that the distal end face 401 of the constraint part 40 is spaced apart from the distal end face 201 of the first support part 20.

[0065] The restraint part 40 has a certain rigidity. In one embodiment, the restraint part 40 is a nickel-titanium tube, stainless steel tube, etc. The outer diameter of the restraint part 40 is smaller than the inner diameter of the guide 320.

[0066] In one embodiment, the tissue clamping device 100 further includes a sealing portion 50, which is sleeved on the restraint portion 40. One end of the sealing portion 50 is fixedly connected to the first support portion 20, and the other end is used to connect to the delivery system. The sealing portion 50 seals and fills the gap between two tissues, further improving the sealing effect. In one embodiment, the sealing portion 50 is made of an elastic material, giving it a certain degree of deformation capability. After clamping, the sealing portion 50 can act as a buffer, preventing the two clamped tissues (such as two leaflets) from being pulled together and reducing clamping stress.

[0067] The shape of the sealing part 50 is not limited; any shape that can achieve both sealing and cushioning functions is acceptable. In one embodiment, the sealing part 50 is cylindrical. In another embodiment, the sealing part 50 has a structure that is smaller at both ends and larger in the middle, with axially opposite ends.

[0068] In one embodiment, the shape of the sealing part 50 matches the shape of the clamping arm 120, such that in the clamped state, the outer surface of the sealing part 50 completely fills the loop of the clamping arm 120, thereby improving the sealing effect.

[0069] In one embodiment, a film (not shown) is provided on the sealing part 50, which covers the surface of the sealing part 50 to further improve the sealing effect.

[0070] The drive component 200 has a rod-shaped structure, and the outer diameter of the drive component 200 is smaller than the inner diameter of the constraint part 40. The drive component 200 is detachably connected to the second support part 30.

[0071] In one embodiment, the drive component 200 and the second support portion 30 are detachably connected by threads. For example, the base 310 of the second support portion 30 has a threaded hole, and the distal end of the drive component 200 is provided with a thread that mates with the threaded hole to achieve a detachable connection.

[0072] Furthermore, the drive member 200 is movably inserted through the constraint portion 40 and is slidable along the axial direction of the constraint portion 40. The axial sliding of the drive member 200 enables the tissue clamping instrument 100 to move between an open and closed position. When the drive member 200 slides distally along the axial direction, the support arm 110 expands radially, opening the clamping arm 120, causing the clamping arm 120 to also expand radially. When the drive member 200 slides proximally along the axial direction, the clamping arm 120 moves in the closing direction along with the support arm 110.

[0073] Please continue reading. Figure 13 In one embodiment, the tissue clamping device 100 further includes a gripping portion 60. In one embodiment, there are two gripping portions 60, which surround both sides of the sealing portion 50. One end of each gripping portion 60 is connected to the first support portion 20, and the other end is a free end. The gripping portions 60 are used to grip tissue to improve surgical efficiency and success rate.

[0074] In one embodiment, the gripping part 60 includes a main body 610 and a plurality of anchoring members 620 spaced apart on the main body 610. One end of the main body 610 is connected to the first support part 20, and the other end is a free end. One end of the anchoring member 620 is connected to the main body 610 at an acute angle, and the other end is a free end that extends outward and faces the support arm 110.

[0075] The delivery, release, and closure process of the tissue clamping device 100 is illustrated using the mitral valve leaflet as an example. In one embodiment, as... Figure 14 The delivery sheath 310 is inserted through the femoral vein and inferior vena cava into the right atrium (RA), then the interatrial septum (AS) is punctured, and the distal end of the delivery sheath 310 reaches the left atrium (LA). The distal end of the delivery sheath 310 is positioned midway above the mitral valve (MV) by adjusting its position, and then the tissue clamping device 100 is pushed out of the delivery sheath 310 using the control mechanism on the operating handle. Figure 15 As shown. For further details, please refer to... Figure 16 The tissue clamping device 100 is pushed to the mitral valve MV position and its position is adjusted (if necessary) so that the clamping arm 120 of the tissue clamping device 100 is located on the side of the mitral valve leaflet closer to the left ventricle (LV). The drive component 200 is moved axially by the control on the operating handle, thereby opening the support arm 110 and the clamping arm 120 to capture the leaflet. Next, the angle of the gripping part 60 is controlled by the control wire 330 to capture the leaflet. Once the gripping part 60 has captured the leaflet, the drive component 200 is moved axially to move the support arm 110 and the clamping arm 120 from the open position to the closed position, thereby clamping the leaflet between the gripping part 60 and the support arm 110. Figure 17As shown, this reduces the opening area of ​​the mitral valve MV. After clamping, the control wire 330 is removed, the connection between the drive component 200 and the second support 30 is released, the connection between the connector and the tissue closure instrument 100 is released, the delivery device is withdrawn, and the surgery is completed.

[0076] In the closed state, the distal end of the restraint part 40 is housed in the guide member 320, so that the distal end of the drive member 200 is covered by the restraint part 40 and the guide member 320, and is simultaneously restrained by the restraint part 40 and the guide member 320. When the tissue clamping device 100 is to be opened, the force exerted on the clamping arm 120 is at its maximum at the instant of opening. The restraint part 40, the guide member 320 and the drive member 200 form a rigid guide structure. The positioning and guiding function of the rigid guide structure helps to stably transmit the force and evenly distribute it to both sides, which can prevent the clamping arm 120 from shifting, thereby enabling the two clamping arms 120 on both sides to open synchronously and stably.

[0077] Furthermore, the distal end of the constraint part 40 is housed in the guide member 320, and the distal end of the drive member 200 is covered by the constraint part 40 and the guide member 320, which enhances rigidity, maximizes the force effectively transmitted by the drive, and makes it easier to open the clamping arm 120.

[0078] Meanwhile, due to the rigidity enhancement effect of the constraint part 40 and the guide 320, a drive part 200 with a smaller outer diameter can be used to make the overall flexibility of the tissue clamping system 1 better, so as to facilitate passage through the curved lumen.

[0079] In one embodiment, when the included angle θ of the two support arms 110 (e.g., Figure 4 When the angle θ between the two support arms 110 is 60° to 150°, the distal end of the constraint part 40 is housed in the guide member 320. When the angle θ between the two support arms 110 is 60° to 150°, the distal end of the constraint part 40 is kept housed in the guide member 320, and the distal end of the drive member 200 is covered by the constraint part 40 and the guide member 320, so that the axial central axis II of the tissue clamping device 100 is subjected to uniform force on both sides, which helps to ensure that no displacement occurs during the subsequent opening and closing processes, thereby improving the clamping effect.

[0080] In one embodiment, when the included angle θ between the two support arms 110 is 120°, the distal end of the constraint portion 40 is housed in the guide member 320 to ensure that no displacement occurs during the further opening process and subsequent closing process, thereby improving the clamping effect.

[0081] Figure 13In the illustrated state, the included angle θ between the two support arms 110 is greater than 180°, indicating a state ready for retraction, i.e., the transition point between the open and closed states. At this time, the distal end of the constraint part 40 has disengaged from the guide member 320, and the distal end face 401 of the constraint part 40 is spaced apart from the proximal end face 321 of the guide member 320, exposing the drive member 200. At this time, the distal end of the drive member 200 remains connected to the base 310.

[0082] It should be noted that the included angle θ of the two support arms 110 mentioned above refers to the included angle formed by the two support arms 110 on the side away from the second support part 30.

[0083] The aforementioned tissue clamping system 1 is provided with a constraint part 40 and a second support part 30 including a guide member 320. The drive member 200 passes through the constraint part 40, and in the closed state, the distal end of the constraint part 40 is housed in the guide member 320. The constraint part 40 and the guide member 320 cover the drive member 200, which can form a good constraint and reinforcement effect on the drive member 200. This is beneficial to the stability of the force on the support arm 110 and the clamping arm 120 at the moment when the support arm 110 just radiates outward or opens, so that no displacement occurs during subsequent further opening and subsequent closing, and the clamping effect is good.

[0084] It should be noted that, in one embodiment, the base 310 in the second support portion 30 can be omitted. When the base 310 is omitted, the clamping arm 120 is directly connected to the guide member 320. For example, the straight rod 1212B of the clamping arm 120 is directly connected to the outer wall of the guide member 320. Furthermore, the distal end of the driving member 200 is provided with a connecting portion that is threadedly connected to the inner wall of the guide member 320. The outer diameter of the connecting portion is larger than the outer diameter of the rest of the driving member 200, so that when the driving member 200 and the guide member 320 are connected, the distal end of the restraining portion 40 can be accommodated in the guide member 320.

[0085] Furthermore, since the support arm 110 of the tissue closure device 100 includes a bent section 111 and a straight section 112, during the opening process, the component force applied by the support arm 110 to the clamping arm 120 in the opening direction is increased, making it easier to open the clamping arm 120, thereby improving the safety of the operating system.

[0086] Furthermore, due to the special structural design of the clamping arms 120, the free ends of the two clamping arms 120 are far away from the axial central axis II, making it easier to open the clamping arms 120. A small force is required to make the support arm 110 open the clamping arms 120, and make the connecting section 122 of the clamping arms 120 move away from the axial central axis II, so that the clamping arms 120 are in an open state.

[0087] Furthermore, since the end of the curved segment 1212 of the clamping arm 120 that is close to the extension segment 1211 is in the same plane as the extension segment 1211, the two clamping arms 120 can reliably clamp the sealing part 50 in the closed position to prevent it from falling off and to maintain the sealing performance.

[0088] It should be noted that in other embodiments, the sealing part 50 can be omitted. In the closed state, the two clamping arms 120 surrounding the restraining part 40 are pressed together and abut against each other, which can also achieve a good clamping effect. However, providing the sealing part 50 can further improve the clamping and sealing effects.

[0089] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A tissue clamping system, characterized in that, The device includes a tissue clamping instrument and a driving component. The tissue clamping instrument includes a clamping part, a first support part, a second support part, and a restraining part. The clamping part includes at least two support arms and at least two clamping arms corresponding to the at least two support arms. The at least two support arms are disposed on the first support part, and the at least two clamping arms are disposed on the second support part. The second support part includes a guide member. The restraining part passes through the first support part and is fixedly connected to the first support part. The driving component passes through the restraining part and is detachably connected to the second support part. The driving component is used to drive the at least two support arms to expand or close radially relative to the restraining part, so that the at least two clamping arms expand or close radially relative to the restraining part. In the closed state, the distal end of the restraining part is received in the guide member, so that at the instant the support arm is expanded, the distal end of the restraining part is received in the guide member. The outer diameter of the restraining part is smaller than the inner diameter of the guide member.

2. The tissue clamping system according to claim 1, characterized in that, When the included angle between the two support arms is 60° to 150°, the distal end of the constraint portion is housed in the guide member.

3. The tissue clamping system according to claim 1, characterized in that, When the included angle between the two support arms is 120°, the distal end of the constraint portion is housed in the guide member.

4. The tissue clamping system according to claim 1, characterized in that, The tissue clamping device further includes a sealing part, which is sleeved on the restraining part.

5. The tissue clamping system according to claim 1, characterized in that, One end of the support arm is rotatably connected to the first support portion, one end of the clamping arm is fixedly connected to the second support portion, and the other end of the support arm is rotatably connected to the other end of the clamping arm.

6. The tissue clamping system according to claim 1, characterized in that, The support arm includes a curved section and a straight section. One end of the curved section is fixedly connected to the straight section, and the other end is rotatably connected to the clamping arm; or, one end of the curved section is fixedly connected to the straight section, and the end of the straight section away from the curved section is rotatably connected to the clamping arm.

7. The tissue clamping system according to claim 6, characterized in that, In the closed position, the curved section is bent, and the degree of bending of the curved section increases as the clamping arm and the support arm move from the closed position to the open position.

8. The tissue clamping system according to claim 1, characterized in that, The clamping arm includes a connecting section and two support sections. The two ends of the connecting section are respectively connected to the two support sections, and the end of the connecting section is the free end of the clamping arm. Each support section includes a bending segment and an extension segment. One end of the bending segment is connected to the extension segment, and the other end is connected to the connecting section. The end of the bending segment away from the extension segment is not in the same plane as the extension segment, so that the connecting section is away from the axial central axis of the tissue clamping device.

9. The tissue clamping system according to claim 8, characterized in that, The extension segment includes a curved rod and a straight rod connected to the curved rod, with one end of the curved rod away from the straight rod connected to the curved segment.

10. The tissue clamping system according to claim 9, characterized in that, There are two clamping arms. In the closed state, the connection between the bent rod and the bent segment of one clamping arm abuts against the connection between the bent rod and the bent segment of the other clamping arm.

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