Thrombus pulling stent and thrombectomy apparatus

Abstract

The present application relates to a thrombus pulling stent (10) and a thrombectomy apparatus. The thrombus pulling stent (10) comprises a thrombus pulling section (11), a cutting section (12), and a braided section (13). The cutting section (12) is connected between the thrombus pulling section (11) and the braided section (13). The thrombus pulling section (11) comprises a plurality of thrombus pulling rods (111). The plurality of thrombus pulling rods (111) are obliquely arranged relative to an axial direction of the thrombus pulling stent (10) and are circumferentially distributed.

Description

Bolt support and bolt removal device

[0001] This application claims priority to Chinese patent application No. 202510065881.3, filed on January 15, 2025, entitled “Pulley Bracket and Pulley Removal Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of medical device technology, and in particular to a thrombectomy stent and a thrombectomy device. Background Technology

[0003] Deep venous thrombosis (DVT) is a disease that obstructs venous return caused by abnormal blood clotting in deep veins, and it often occurs in the lower extremities. Pulmonary embolism (PE) is caused by the detachment of a thrombus. The main adverse consequences of DVT are PE and post-thrombotic syndrome (PTS), which can cause swelling and pain in the lower extremities, seriously affecting the patient's quality of life. Severe PE can lead to death.

[0004] Currently, endovascular treatments for lower extremity deep vein thrombosis (DVT) mainly include catheter-directed thrombolysis (CDT), percutaneous mechanical thrombectomy (PMT), large-lumen catheter aspiration, balloon dilation, and stenting. CDT and PMT have relatively low efficiency in clearing subacute thrombi. Summary of the Invention

[0005] According to various embodiments of this application, a bolt support and a bolt removal device are provided.

[0006] On one hand, this application provides a bolted bracket, comprising:

[0007] The bolt section includes multiple bolt rods, which are inclined relative to the axial direction of the bolt bracket and are circumferentially distributed.

[0008] Woven sections; and

[0009] A cutting segment, which connects the bolt segment and the braided segment.

[0010] On the other hand, this application provides a thrombus removal device, including a thrombus fragmentation bracket, an inner tube, and a thrombus puller as described above. The thrombus fragmentation bracket is fixed to the inner tube, and the inner tube is used to drive the thrombus fragmentation bracket to move within the thrombus puller. Attached Figure Description

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

[0012] Figure 1 is a schematic diagram of the structure of a tie rod bracket according to one embodiment.

[0013] Figure 2 is a structural schematic diagram of a tie rod bracket according to another embodiment.

[0014] Figure 3 is a schematic diagram of the structure of the tie layer in a tie-bolt support according to one embodiment.

[0015] Figure 4 is a schematic diagram of a bolt bracket according to one embodiment, showing that the cutting rod of the cutting section has a limiting groove.

[0016] Figure 5 is a schematic diagram showing the connection between the cutting rod of the cutting section and the braided yarn of the braided section through a connecting pipe in a bolt bracket according to one embodiment.

[0017] Figure 6 is a schematic diagram of the connecting tube in a bolt bracket according to one embodiment.

[0018] Figure 7 is a schematic diagram of the structure of a bolt support in one embodiment, where the transition band in the cut section is not connected to the braided section by the connecting tube.

[0019] Figure 8 is a schematic diagram of the structure of a bolt support in one embodiment, in which the transition band in the cutting section is connected to the braided section via a connecting tube.

[0020] Figure 9 is a schematic diagram of the structure of a bolt support in one embodiment, in which the transition band in the braided section is connected to the cut section via a connecting pipe.

[0021] Figure 10 is a schematic diagram of the combined structure of the bolt puller bracket and the bolt breaker bracket of the bolt removal device according to one embodiment.

[0022] Figure 11 is a schematic diagram of the structure of the thrombus breakage bracket of a thrombus removal device according to one embodiment.

[0023] Figure 12 is a top view of the thrombus breakage bracket of the thrombus removal device shown in Figure 11.

[0024] Reference numerals: 10, bolt support; 11, bolt segment; 11a, first bolt layer; 11b, second bolt layer; 111, bolt rod; 112, connecting rod; 112a, first connecting rod; 112b, second connecting rod; 12, cutting segment; 121, cutting rod; 122, limiting groove; 13, braided segment; 131, braided thread; 132, second interval band; 14, connecting tube; 141, opening; 15, transition band; 151, first interval band; 20, bolt support; 20a, support rod; 21, proximal support frame; 22, distal support frame; 30, inner tube. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are 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 this application. However, this application can be implemented 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 this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0026] It should be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0027] The terms “vertical,” “horizontal,” “up,” “down,” “left,” “right,” and similar expressions are for illustrative purposes only and do not represent the only possible implementation.

[0028] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] It should be noted that the terms "distal" and "proximal" are used as directional terms, which are commonly used in the field of interventional medical devices. "Distal" refers to the end that is relatively far from the patient's heart during the procedure, i.e., the distal end; "proximal" refers to the end that is close to the patient's heart during the procedure, i.e., the proximal end. Axial direction refers to the direction in which the central axis of the medical device extends; radial direction refers to the direction perpendicular to the aforementioned axial direction.

[0030] This application provides a tie rod bracket, comprising:

[0031] The bolt section includes multiple bolt rods, which are inclined relative to the axial direction of the bolt bracket and are circumferentially distributed.

[0032] Woven sections; and

[0033] A cutting segment, which connects the bolt segment and the braided segment.

[0034] In one embodiment, the bolt segment includes a first bolt layer and a second bolt layer, the first bolt layer being located at the distal end of the second bolt layer, and both the first bolt layer and the second bolt layer including a plurality of bolt rods, the bolt rods in the first bolt layer and the bolt rods in the second bolt layer being inclined toward different sides of the bolt bracket.

[0035] In one embodiment, both the first and second tie rod layers include connecting rods, with the tie rods in the first tie rod layer connected to each other via connecting rods in the first tie rod layer, and the tie rods in the second tie rod layer connected to each other via connecting rods in the second tie rod layer.

[0036] In one embodiment, the first tie layer and the second tie layer are connected by connecting rods located on corresponding sides.

[0037] In one embodiment, the proximal endpoint of the first tie layer is connected to the distal endpoint of the second tie layer.

[0038] In one embodiment, the bolt includes a first connecting rod and a second connecting rod, the positions of the first connecting rod and the second connecting rod on the periphery of the bolt bracket being symmetrical about the axial direction of the bolt bracket.

[0039] In one embodiment, the cut segment includes multiple grids, and the braided segment includes multiple braided grids, wherein the braided grids of the braided segment are smaller than the grids of the cut segment.

[0040] In one embodiment, the height of the mesh of the cut segment is approximately 3mm-5mm, and the height of the mesh of the woven segment is approximately 1mm-3mm.

[0041] In one embodiment, the cutting segment includes a plurality of cutting rods arranged in a cross pattern to enclose and form a plurality of grids; the braided segment is woven from braided yarns, and the bolt bracket includes a connecting tube for connecting the cutting rods and the braided yarns, thereby connecting the cutting segment and the braided segment.

[0042] In one embodiment, the cutting rod of the cutting segment for connection with the braided segment is provided with a limiting groove, and the connecting tube cooperates with the limiting groove.

[0043] In one embodiment, the connecting tube includes a C-shaped tube with an opening on one side of the tube wall, and the connecting tube is welded to the braided wire in the braided section for connecting the cutting rod.

[0044] In one embodiment, one of the cut segment and the braided segment is provided with a transition band, and the other is connected to the transition band through the connecting tube.

[0045] In one embodiment, the transition band is disposed on the cut section, and the transition band and the side of the braided section facing the cut section have complementary shapes.

[0046] In one embodiment, the transition band is disposed on the braided section, and the transition band and the cut section have complementary shapes on the side facing the braided section.

[0047] In one embodiment, the transition band and the braided segment are integrally formed by braiding, and the braided mesh of the transition band is larger than the braided mesh of the braided segment.

[0048] In one embodiment, there are multiple connecting tubes, and the multiple connecting tubes are arranged in a circular pattern on the tie rod bracket; the transition band includes a first interval band, and the braided section includes a second interval band. The first interval band and the second interval band are both located between adjacent connecting tubes. The wave height of the first interval band is greater than the wave height of the second interval band. In the circumferential direction, the wave crest of the second interval band corresponds to the wave trough of the cut section facing the braided section.

[0049] On the other hand, this application provides a thrombus removal device, including a thrombus fragmentation bracket, an inner tube, and a thrombus puller as described above. The thrombus fragmentation bracket is fixed to the inner tube, and the inner tube is used to drive the thrombus fragmentation bracket to move within the thrombus puller.

[0050] In one embodiment, the inner tube is used to drive the broken bolt support to rotate within the bolt support.

[0051] In one embodiment, the inner tube is used to drive the broken bolt support to move axially within the bolt support.

[0052] In one embodiment, the inner tube is used to drive the broken bolt support to rotate within the bolt support, and is also capable of driving the broken bolt support to move axially within the bolt support.

[0053] Referring to Figure 1, this application embodiment provides a tie rod bracket 10. In some embodiments, the diameter of the tie rod bracket 10 is 12mm-18mm. For example, the diameter of the tie rod bracket 10 can be 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, or 18mm. The diameter of the tie rod bracket 10 is not limited here.

[0054] The bolt support 10 includes a bolt section 11, a cutting section 12, and a braided section 13, with the cutting section 12 connecting the bolt section 11 and the braided section 13.

[0055] The bolt section 11 includes multiple bolt rods 111. The multiple bolt rods 111 are inclined relative to the axial direction of the bolt bracket 10, that is, the bolt rods 111 are not perpendicular to the axial direction of the bolt bracket 10.

[0056] Multiple thrombectomy rods 111 are circumferentially distributed, meaning that the projection of the multiple thrombectomy rods 111 along the axial direction of the thrombectomy stent 10 is a portion of the circumference of the thrombectomy stent 10. Thus, when using the thrombectomy stent 10, the thrombectomy segment 11 will adhere closely to the inner wall of the blood vessel.

[0057] In this embodiment, when using the thrombectomy stent 10 to remove a thrombus, the stent 10 can be inserted along the sheath of the delivery device to the location of the thrombus in the blood vessel. Then, as the stent 10 is moved distally, the thrombectomy rod 111 of the thrombectomy segment 11 peels the attached acute, subacute, or even chronic thrombus from the vessel wall, causing the thrombus to fall into the cutting segment 12 and the braided segment 13. Thus, after the stent 10 is retracted into the sheath of the delivery device, the stent 10 can be removed from the body along with the sheath to remove the thrombus.

[0058] In some embodiments, the multiple tie rods 111 may be arranged in parallel at intervals, or they may be divided into multiple tie layers, each layer including multiple tie rods 111.

[0059] For ease of understanding, the bolted bracket 10 shown in Figure 2 is used as an example. The bolted section 11 includes a first bolted layer 11a and a second bolted layer 11b.

[0060] The tie rods 111 in adjacent tie rod layers are inclined to different sides relative to the axial direction of the tie rod bracket 10. It should be noted that the two tie rods 111 being inclined to different sides can also be understood as the two tie rods 111 being arranged in opposite directions in a staggered manner.

[0061] For the bolt section 11, which includes a first bolt layer 11a and a second bolt layer 11b, the bolt rod 111 in the first bolt layer 11a extends along a first direction, and the bolt rod 111 in the second bolt layer 11b extends along a second direction. The first direction is a direction inclined towards a first side relative to the axial direction of the support, and the second direction is a direction inclined towards a second side relative to the axial direction of the support. Since the first side and the second side are different sides in the radial direction of the bolt support 10, the bolt rod 111 in the first bolt layer 11a and the bolt rod 111 in the second bolt layer 11b are inclined towards different sides of the bolt support 10.

[0062] In some embodiments, the bolt rods 111 in the first bolt layer 11a are arranged in parallel at intervals, and the bolt rods 111 in the second bolt layer 11b are arranged in parallel at intervals.

[0063] It should be noted that the number of tie-bolt layers can be one, two, or more. For example, in some embodiments, in addition to the first tie-bolt layer 11a and the second tie-bolt layer 11b, the tie-bolt segment 11 also includes a third tie-bolt layer.

[0064] The number of bolt layers in bolt section 11 is not limited here.

[0065] Since the thrombectomy rods 111 in adjacent thrombectomy layers are inclined to different sides relative to the thrombectomy support 10, during the thrombectomy process, the thrombectomy rods 111 inclined to different sides can peel thrombi at different positions in the circumferential direction of the blood vessel from the blood vessel wall, increasing the probability of thrombus removal and thus improving thrombus removal efficiency.

[0066] As shown in Figures 2 and 3, in the same bolt layer, every two bolt rods 111 start from one side of the bolt bracket 10 and extend obliquely to the opposite side relative to the axial direction of the bolt bracket 10 to enclose and form the circumference of the bolt section 11.

[0067] The bolt layer includes a connecting rod 112. The bolt rods 111 in the same bolt layer are connected by the connecting rod 112 to ensure the transmission of force between the bolt rods 111 and the overall structural stability of the bolt section 11.

[0068] For example, both the first bolt layer 11a and the second bolt layer 11b include a connecting rod 112. The bolt rods 111 in the first bolt layer 11a are connected to each other through the connecting rod 112 in the first bolt layer 11a, and the bolt rods 111 in the second bolt layer 11b are connected to each other through the connecting rod 112 in the second bolt layer 11b.

[0069] Adjacent bolt layers are connected by connecting rods 112 on corresponding sides. For example, in an embodiment where bolt segment 11 includes a first bolt layer 11a and a second bolt layer 11b, the first bolt layer 11a and the second bolt layer 11b are connected by connecting rods 112 located on corresponding sides.

[0070] The first thrombectomy layer 11a is located at the distal end of the second thrombectomy layer 11b. Thus, when the thrombectomy stent 10 located in the blood vessel is moved distally, the first thrombectomy layer 11a will drive the second thrombectomy layer 11b to move distally together via the connecting rod 112.

[0071] It should be noted that the connection between the first thrombectomy layer 11a and the second thrombectomy layer 11b is not limited to being via the connecting rod 112. In some embodiments, the first thrombectomy layer 11a and the second thrombectomy layer 11b may also be connected by a structure other than the connecting rod 112. For example, the proximal endpoint of the first thrombectomy layer 11a and the distal endpoint of the second thrombectomy layer 11b may be connected. Here, it should be noted that the proximal endpoint of the first thrombectomy layer 11a refers to the portion of the proximal end of the first thrombectomy layer 11a closest to the second thrombectomy layer 11b along the axial direction of the thrombectomy stent 10. Correspondingly, the distal endpoint of the second thrombectomy layer 11b refers to the portion of the distal end of the second thrombectomy layer 11b closest to the first thrombectomy layer 11a along the axial direction of the thrombectomy stent 10. Thus, when the thrombectomy stent 10 located within the blood vessel is moved distally, the first thrombectomy layer 11a can move the second thrombectomy layer 11b distally as well.

[0072] The connection method between the first tie layer 11a and the second tie layer 11b is not limited here.

[0073] Continuing with Figures 2 and 3, the tie rod 111 includes a first connecting rod 112a and a second connecting rod 112b. The positions of the first connecting rod 112a and the second connecting rod 112b on the periphery of the tie rod bracket 10 are symmetrically arranged about the axial direction of the tie rod bracket 10, which is beneficial to the structural stability of the tie rod bracket 10.

[0074] In some embodiments, the cutting segment 12 includes multiple meshes, so that the cutting segment 12 can collect thrombi pulled out by the thrombus retraction segment 11 while allowing blood flow through the meshes. This ensures that blood flow in the blood vessel remains normal during the thrombus retraction process of the thrombus retraction stent 10, thus preventing vascular embolism. Furthermore, with this structure, since blood flow can pass through the meshes while thrombi cannot, the thrombi collected by the cutting segment 12 will separate from the blood when the thrombus retraction stent 10 is removed, reducing the amount of blood carried out of the body by the thrombus retraction stent 10.

[0075] It should be noted that the size of the mesh only needs to be suitable for thrombus collection. For example, the mesh height can be 3mm-5mm. The mesh height can be 3mm, 4mm or 5mm, and there is no limitation here.

[0076] The shape of the grid includes, but is not limited to, triangles, squares, or rhombuses.

[0077] The braided segment 13 is woven from braided yarns 131. The braided segment 13 includes multiple braided meshes, which are denser than the meshes in the cut segment 12. Specifically, the braided meshes in the braided segment 13 are smaller than those in the cut segment 12. This facilitates the collection of detached thrombi and prevents thrombus escape.

[0078] In this embodiment, the braided segment 13 can be used to collect acute or subacute thrombi pulled off by the cutting segment 12, and the radial force of the braided segment 13 is moderate. Since the braided segment 13 is woven from braided filaments 131, its size can be changed according to the size of the blood vessel to adapt to the physiological and anatomical structure of the iliac vein, which changes from thick to thin.

[0079] In some embodiments, the height of the braided mesh of the braided segment 13 is 1mm-3mm. The height of the braided mesh of the braided segment 13 can be 1mm, 2mm or 3mm.

[0080] In embodiments where the mesh height of the braided segment 13 is smaller than that of the cut segment 12, when the mesh height of the cut segment 12 is 3mm, the mesh height of the braided segment 13 is less than 3mm, specifically it can be 1mm, 1.2mm, 1.5mm, 1.7mm, 1.8mm, 2mm, 2.3mm, 2.4mm, 2.5mm, 2.7mm, 2.8mm, or 2.9mm. When the mesh height of the cut segment 12 is 4mm, the mesh height of the braided segment 13 is less than 4mm, specifically it can be 1mm, 1.2mm, 1.5mm, 1.7mm, 1.8mm, 2mm, 2.3mm, 2.4mm, 2.5mm, 2.7mm, 2.8mm, 2.9mm, 3.1mm, 3.4mm, 3.5mm, 3.7mm, 3.8mm, or 3.9mm. When the mesh height of the cut segment 12 is 5mm, the mesh height of the braided segment 13 is less than 4mm, specifically it can be 1mm, 1.2mm, 1.5mm, 1.7mm, 1.8mm, 2mm, 2.3mm, 2.4mm, 2.5mm, 2.7mm, 2.8mm, 2.9mm, 3.1mm, 3.4mm, 3.5mm, 3.7mm, 3.8mm, 3.9mm, 4.1mm, 4.4mm, 4.5mm, 4.7mm, 4.8mm, or 4.9mm.

[0081] The mesh size of the cut segment 12 and the mesh size of the braided segment 13 are not limited here.

[0082] In some embodiments, the length of the braided segment 13 is 20mm-50mm. For example, the length of the braided segment 13 is 20mm, 25mm, 30mm, 35mm, 40mm, 45mm or 50mm.

[0083] In some embodiments, the bolt section 11 and the cut section 12 can be integrally formed by cutting a metal pipe. In this way, the bolt section 11 and the cut section 12 do not need to be connected by other connectors, which improves structural stability and simplifies the manufacturing process of the bolt bracket 10.

[0084] Referring to Figures 4 and 5, in some embodiments, the thimble stent 10 includes a connecting tube 14, through which the cut segment 12 and the braided segment 13 are connected. In this embodiment, the connecting tube 14 effectively connects the cut segment 12 and the braided segment 13. Thus, even if the cut segment 12 and the braided segment 13 are made of different materials or using different processes, the connecting tube 14 can stably connect them. For example, the cut segment 12 and the braided segment 13 can be composed of the same or different medical metal materials. The material of the cut segment 12 includes, but is not limited to, nickel-titanium alloy, stainless steel alloy, or cobalt-chromium alloy. The material of the braided segment 13 includes, but is not limited to, nickel-titanium alloy, stainless steel alloy, or cobalt-chromium alloy.

[0085] In some embodiments, the nickel-titanium alloy cut section 12 and the stainless steel braided section 13 can be connected to each other using the connecting pipe 14, or the stainless steel cut section 12 and the nickel-titanium alloy braided section 13 can be connected to each other using the connecting pipe 14.

[0086] For ease of understanding, the rods used to enclose and form a grid in the cutting segment 12 will be referred to as "cutting rods 121" below. That is to say, the cutting segment 12 includes multiple cutting rods 121, which are arranged in a cross pattern to enclose and form multiple grids.

[0087] Since the rod used to enclose and form the grid in the cutting segment 12 is the cutting rod 121, and the braided segment 13 is woven from braided yarn 131, in the embodiment where the cutting segment 12 and the braided segment 13 are connected by the connecting pipe 14, the connecting pipe 14 is used to connect the cutting rod 121 and the braided yarn 131.

[0088] The cutting rod 121 and the braided wire 131 passing through the connecting tube 14 can avoid mutual displacement, thereby reducing the wear of the braided wire 131 or the cutting rod 121, and consequently reducing the risk of breakage of the braided wire 131 of the braided section 13 or the cutting rod 121 of the cutting section 12.

[0089] It should be noted that since the cutting segment 12 and the braided segment 13 are connected by the connecting tube 14, when the thrombectomy stent 10 moves from a large blood vessel to a smaller blood vessel, the pulling force on the cutting segment 12 can be transmitted to the braided segment 13.

[0090] The cutting rod 121 of the cutting section 12, which is used to connect with the braided section 13, is provided with a limiting groove 122. The connecting tube 14 cooperates with the limiting groove 122, so that the position of the connecting tube 14 on the cutting section 12 is limited by the limiting groove 122, so as to facilitate the stable connection of the connecting tube 14 to the cutting section 12 and the braided section 13.

[0091] The process of connecting the cutting section 12 and the braided section 13 using the connecting tube 14 can be as follows: the connecting tube 14 is sleeved on the cutting rod 121 and the braided wire 131 of the braided section 13. The connecting tube 14 is fixed in the limiting groove 122 and connected to the braided wire 131, so that the connecting tube 14 fixes the braided wire 131 to the cutting rod 121, thereby fixing the cutting section 12 and the braided section 13.

[0092] In some embodiments, the length of the limiting groove 122 is equal to the length of the connecting pipe 14, and the width of the limiting groove 122 is equal to the thickness of the connecting pipe 14. This facilitates the connection between the connecting pipe 14 and the limiting groove 122, thereby improving the stability of the connecting pipe 14 on the cutting section 12, which in turn helps to ensure the connection stability between the cutting section 12 and the braided section 13.

[0093] As shown in Figure 6, the connecting pipe 14 can be a C-shaped pipe with an opening 141 on one side of the pipe wall, that is, the cross-sectional shape of the connecting pipe 14 is "C".

[0094] Preferably, the width of the opening 141 is consistent with the maximum value of either the thickness of the cutting rod 121 of the cutting segment 12 or the diameter of the braided segment 13, and the diameter of the connecting tube 14 is consistent with the sum of the width of the cutting rod 121 and the diameter of the braided wire 131. In this way, the connecting tube 14 can meet the requirement of completely wrapping around the cutting rod 121 and the braided wire 131, while also avoiding material waste caused by an excessively large diameter of the connecting tube 14.

[0095] In some embodiments, the opening 141 of the connecting tube 14 can be closed by welding to help maintain the smoothness of the outer peripheral surface of the connecting tube 14, thereby reducing the chance of the connecting tube 14 scratching the blood vessel wall.

[0096] In some embodiments, the connecting tube 14 is welded to the braided wires 131 in the braided section 13 used to connect the cutting rod 121. For example, the connecting tube 14 is sleeved onto the cutting rod 121 from one side of the limiting groove 122 using the opening 141 of the connecting tube 14. By welding the braided wires 131 to the connecting tube 14, the connecting tube 14 can connect the braided wires 131 to the cutting rod 121, thereby connecting the cutting section 12 and the braided section 13.

[0097] In embodiments where the connecting tube 14 and the braided wire 131 are welded, the connecting tube 14 and the braided wire 131 can be made of the same material to improve the welding strength. For example, the connecting tube 14 and the braided wire 131 can both be made of nickel-titanium alloy, or the connecting tube 14 and the braided wire 131 can both be made of stainless steel alloy, or the connecting tube 14 and the braided wire 131 can both be made of cobalt-chromium alloy.

[0098] The number of connecting pipes 14 can be multiple, and the multiple connecting pipes 14 can be arranged in a circumferential pattern on the tie rod bracket 10 to enhance the overall structural stability of the tie rod bracket 10. In some embodiments, there can be two, three or more connecting pipes 14. The number of connecting pipes 14 is not limited here.

[0099] Referring to Figures 7 and 8, in some embodiments, one of the cut segment 12 and the braided segment 13 is provided with a transition band 15, and the other is connected to the transition band 15 via a connecting pipe 14. Since the mesh size of the cut segment 12 is larger than the braided mesh size of the braided segment 13, using a transition band 15 can effectively achieve the connection between the cut segment 12 and the braided segment 13, facilitating the connection of the cut segment 12 and the braided segment 13 together via the connecting pipe 14.

[0100] The wave rods between adjacent connecting pipes 14 in the transition band 15 form an interval band. In this embodiment, the interval band is formed by the wave rods located between adjacent connecting pipes 14, that is, the wave rods of adjacent connecting pipes 14 are connected through this interval band.

[0101] The interval band includes at least one peak or at least one trough.

[0102] It should be noted that, for transition band 15, the crests and troughs in transition band 15 are alternately arranged in the circumferential direction of the tie rod support 10. Therefore, the wave rod used to form the interval band in transition band 15 extends in a wavy shape to form crests or troughs. When the interval band includes two crests, there is a trough between the two crests; correspondingly, when the interval band includes two troughs, there is a crest between the two troughs.

[0103] The number of peaks and troughs in the interval band is not limited here.

[0104] For example, the interval band formed by the wave rods between adjacent connecting pipes 14 includes 1 to 3 wave peaks, or the interval band formed by the wave rods between adjacent connecting pipes 14 includes 1 to 3 wave troughs.

[0105] In some implementations, the specific number of peaks and troughs in the transition band 15 can be set according to the number of grids or the number of woven grids.

[0106] For example, in some embodiments, the transition band 15 is disposed on the cutting section 12. The transition band 15 is complementary to the braiding section 13, that is, the shapes of the transition band 15 and the braiding section 13 facing the cutting section 12 are complementary. This facilitates the connecting tube 14 to connect the wave rod in the transition band 15 to the braiding yarn 131 in the braiding section 13.

[0107] The woven segment 13 has N grids in its circumferential direction, which correspond to N peaks and N troughs. Correspondingly, the transition segment 15 can also have N peaks and N troughs. Here, N is a positive integer greater than or equal to 3.

[0108] For ease of understanding, referring to Figure 8, the braided section 13 has 8 grids on its circumference. The transition band 15 has 8 peaks and 8 troughs, corresponding to the peaks and troughs of the 8 grids of the braided section 13 on the side near the cut section 12. Four connecting pipes 14 are evenly arranged on the circumference of the bolt bracket 10. In this case, the interval band between any two adjacent connecting pipes 14 includes one peak and one trough.

[0109] In the above embodiment, since the transition band 15 and the braided section 13 are complementary, the peaks in the transition band 15 correspond to the peaks in the braided section 13, and correspondingly, the troughs in the transition band 15 correspond to the troughs in the braided section 13. Thus, in the radial direction, the transition band 15 and the braided section 13 do not overlap, thereby not increasing the thickness of the bolt support 10 after compression.

[0110] For example, referring to Figure 9, in some embodiments, a transition band 15 is provided on the braiding section 13. The transition band 15 is complementary to the cutting section 12, that is, the shapes of the transition band 15 and the cutting section 12 facing the braiding section 13 are complementary. Since the transition band 15 and the cutting section 12 are complementary, the braiding filaments 131 forming the braided mesh in the transition band 15 are connected to the wave rods on the side of the cutting section 12 near the braiding section 13 via connecting tubes 14.

[0111] In some embodiments, the transition band 15 and the braided section 13 are integrally formed by braiding, which provides good stability between the transition band 15 and the braided section 13 and simplifies the braiding process, thereby improving manufacturing efficiency.

[0112] Furthermore, the braided mesh of the transition band 15 is larger than that of the braided section 13, which facilitates the connection between the braided section 13 and the cut section 12 through the transition band 15.

[0113] Understandably, since the woven mesh in transition band 15 is larger than the woven mesh in woven section 13, the distance between the crests and troughs (i.e., the wave height) of transition band 15 on the side facing cut section 12 is greater than the distance between the crests and troughs of woven section 13 on the side facing cut section 12.

[0114] The transition band 15 includes a first spacer band 151, and the braided section 13 includes a second spacer band 132. Both the first spacer band 151 and the second spacer band 132 are located between adjacent connecting pipes 14. For ease of understanding, the band in the transition band 15 corresponding to the connecting pipes 14 is referred to as the first spacer band 151, and the band in the braided section 13 facing the cutting section 12 corresponding to the connecting pipes 14 is referred to as the second spacer band 132.

[0115] It should be noted that the first interval band 151 includes at least one wave crest or at least one wave trough. The second interval band 132 includes at least one wave crest or at least one wave trough.

[0116] The wave height of the first interval band 151 is greater than that of the second interval band 132. Circumferentially, the peak of the second interval band 132 corresponds to the trough of the cut segment 12 on the side facing the braided segment 13, thus preventing the second interval band 132 from overlapping with the cut segment 12. This helps reduce the circumferential cross-sectional area of ​​the compressed thrombectomy stent 10. This facilitates the retraction of the thrombectomy stent 10 into the sheath, reduces retrieval resistance, and consequently reduces the likelihood of thrombus obstruction of the sheath, causing the thrombectomy stent 10 to fail to retract into the sheath.

[0117] The first interval band 151 may include 1 to 3 peaks or 1 to 3 troughs. The number of peaks and troughs in the first interval band 151 is not limited here.

[0118] The second interval band 132 may include 1 to 3 peaks or 1 to 3 troughs. The number of peaks and troughs in the second interval band 132 is not limited here.

[0119] It should be noted that there are multiple possibilities for the weaving method of the transition band 15 and the braided section 13.

[0120] For example, in some embodiments, the knitting stitches used in the knitting section 13 can be "one over one", "one over two", or "two over two". To improve the production efficiency of the knitting section 13, an automatic knitting machine can be used to process the knitting section 13.

[0121] The braided segment 13 can be made of alloy wire. For example, the material of the metal wire used to make the braided segment 13 can be nickel-titanium alloy wire.

[0122] Another embodiment of this application provides a bolt removal device, which includes the bolt support 10 described above.

[0123] Because the multiple thrombectomy rods 111 of the thrombectomy stent 10 can effectively detach acute and subacute thrombi attached to the vessel wall from the vessel wall, and collect the thrombi detached from the vessel wall within the braided segment 13 through blood flow or accumulation. Thus, after the thrombectomy stent 10 of the thrombectomy device is inserted into the sheath of the delivery device, the thrombectomy stent 10 and the thrombi within it can be pulled out of the body along with the sheath, thereby achieving efficient thrombus removal.

[0124] In related technologies, thrombectomy stents are often used to remove subacute thrombi. Subacute thrombi are mostly a mixture of tough tissue and fresh thrombi. Although thrombectomy stents can remove subacute thrombi from blood vessels, when pulling the thrombus out of the body, it is easy for the thrombus to become stuck in the stent, making it impossible to retrieve the stent into the sheath. Ultimately, it is necessary to cut open the blood vessel to remove the device.

[0125] In this regard, as shown in Figure 10, the thrombus removal device of this application also includes a thrombus fragmentation bracket 20 and an inner tube 30, with the thrombus fragmentation bracket 20 and the inner tube 30 fixed together.

[0126] The inner tube 30 is used to drive the fragmented stent 20 to rotate and / or move axially within the thrombectomy stent 10. Specifically, when the inner tube 30 is rotated, it drives the fragmented stent 20 to rotate. When the inner tube 30 is moved axially, the fragmented stent 20 moves axially with the inner tube 30. Thus, after the thrombus in the blood vessel is detached from the vessel wall using the thrombectomy stent 10, the fragmented stent 20 can break up the thrombus that falls into the braided section 13, reducing the probability of the thrombus becoming lodged in the thrombectomy stent 10, thereby facilitating the retrieval of the thrombectomy stent 10 into the sheath of the delivery device.

[0127] The specifications and structure of the puncture stent 20 are not specified here.

[0128] Referring to Figure 11, in some embodiments, the thrombectomy stent 20 is laser-cut from a nickel-titanium tube with an outer diameter OD of 1.5mm-2.0mm and a wall thickness of 0.15mm-0.25mm. For example, the thrombectomy stent 20 is laser-cut from a nickel-titanium tube with an outer diameter OD of 1.5mm and a wall thickness of 0.15mm; or, the thrombectomy stent 20 is laser-cut from a nickel-titanium tube with an outer diameter OD of 2.0mm and a wall thickness of 0.25mm; or, the thrombectomy stent 20 is laser-cut from a nickel-titanium tube with an outer diameter OD of 1mm and a wall thickness of 0.2mm.

[0129] In some embodiments, the support diameter of the thrombus fragmentation bracket 20 is 15mm-20mm. For example, the support diameter of the thrombus fragmentation bracket 20 is 15mm, 17mm, 18mm, 19mm or 20mm.

[0130] In some embodiments, the thrombus stent 20 includes a proximal support frame 21 and a distal support frame 22, with the distal end of the proximal support frame 21 connected to the proximal end of the distal support frame 22.

[0131] Both the proximal support frame 21 and the distal support frame 22 include multiple support rods 20a, which are radially and evenly distributed, thereby enabling the thrombus fragmentation stent 20 to have a good fragmentation effect on the thrombus.

[0132] The number of support rods 20a is not limited here. For example, as shown in Figures 11 and 12, the number of support rods 20a in the proximal support frame 21 branches from 6 to 12 and is radially evenly distributed. The number of support rods 20a in the distal support frame 22 merges from 12 to 6 and is radially evenly distributed.

[0133] The length L1 of the proximal support 21 can be 3mm-10mm. For example, the length L1 of the proximal support 21 can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm.

[0134] The length L2 of the distal support 22 can be 7mm-20mm. For example, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm.

[0135] The values ​​of the length L1 of the proximal support frame 21 and the length L2 of the distal support frame 22 are not limited here.

[0136] It should be noted that, in the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0137] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0138] In this application, unless otherwise expressly specified and limited, the first feature being "on" or "below" the second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium.

[0139] 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.

[0140] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

A bolt-type bracket, characterized in that, include: The bolt section includes multiple bolt rods, which are inclined relative to the axial direction of the bolt bracket and are circumferentially distributed. Woven sections; and A cutting segment, which connects the bolt segment and the braided segment. According to claim 1, the bolt bracket is characterized in that, The bolt section includes a first bolt layer and a second bolt layer. The first bolt layer is located at the far end of the second bolt layer. Both the first bolt layer and the second bolt layer include multiple bolt rods. The bolt rods in the first bolt layer and the bolt rods in the second bolt layer are inclined toward different sides of the bolt bracket. The bolt bracket according to claim 2 is characterized in that, Both the first and second tie rod layers include connecting rods. The tie rods in the first tie rod layer are connected to each other through the connecting rods in the first tie rod layer, and the tie rods in the second tie rod layer are connected to each other through the connecting rods in the second tie rod layer. The bolt bracket according to claim 3 is characterized in that, The first tie layer and the second tie layer are connected by connecting rods located on corresponding sides. According to claim 3, the bolt bracket is characterized in that, The proximal end of the first tie layer is connected to the distal end of the second tie layer. According to claim 3, the bolt bracket is characterized in that, The bolt rod includes a first connecting rod and a second connecting rod, and the positions of the first connecting rod and the second connecting rod on the periphery of the bolt bracket are symmetrical about the axial direction of the bolt bracket. According to claim 1, the bolt bracket is characterized in that, The cut segment includes multiple grids, and the braided segment includes multiple braided grids, wherein the braided grids of the braided segment are smaller than the grids of the cut segment. According to claim 7, the bolt bracket is characterized in that, The height of the mesh in the cut section is approximately 3mm-5mm, and the height of the mesh in the woven section is approximately 1mm-3mm. According to claim 7, the bolt bracket is characterized in that, The cutting segment includes multiple cutting rods arranged in a crisscross pattern to form multiple grids; the braided segment is woven from braided yarns, and the bolt bracket includes a connecting tube for connecting the cutting rods and the braided yarns, thereby connecting the cutting segment and the braided segment. According to claim 9, the bolt bracket is characterized in that, The cutting rod of the cutting section, which is used to connect with the braiding section, is provided with a limiting groove, and the connecting pipe cooperates with the limiting groove. According to claim 10, the bolt bracket is characterized in that, The connecting pipe includes a C-shaped pipe with an opening on one side of the pipe wall, and the connecting pipe is welded to the braided wire in the braided section used to connect the cutting rod. According to claim 9, the bolt bracket is characterized in that, One of the cut section and the braided section is provided with a transition band, and the other is connected to the transition band through the connecting pipe. According to claim 12, the bolt bracket is characterized in that, The transition band is disposed on the cut section, and the shape of the transition band and the side of the braided section facing the cut section are complementary. According to claim 12, the bolt bracket is characterized in that, The transition band is disposed on the braided section, and the transition band and the cut section have complementary shapes on the side facing the braided section. The bolt bracket according to claim 14 is characterized in that, The transition band and the braided segment are integrally formed by braiding, and the braided mesh of the transition band is larger than the braided mesh of the braided segment. The bolt bracket according to claim 15 is characterized in that, The number of connecting pipes is multiple, and the multiple connecting pipes are arranged in a circular pattern on the bolt bracket; The transition band includes a first interval band, and the braided section includes a second interval band. Both the first interval band and the second interval band are located between adjacent connecting pipes. The wave height of the first interval band is greater than that of the second interval band. In the circumferential direction, the wave crest of the second interval band corresponds to the wave trough on the side of the cut section facing the braided section. A thrombus removal device, characterized in that, It includes a puncture bolt support, an inner tube, and a pull bolt support as described in any one of claims 1-14, wherein the puncture bolt support is fixed to the inner tube, and the inner tube is used to drive the puncture bolt support to move within the pull bolt support. The thrombectomy device according to claim 17 is characterized in that, The inner tube is used to drive the broken bolt support to rotate inside the bolt support. The thrombectomy device according to claim 17 is characterized in that, The inner tube is used to drive the broken bolt support to move axially within the bolt support. The thrombectomy device according to claim 17 is characterized in that, The inner tube is used to drive the broken bolt support to rotate within the bolt support, and can also drive the broken bolt support to move axially within the bolt support.

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