Core rod, braiding apparatus and fixing method

Abstract

The embodiment of the present application provides a kind of core rod, braiding equipment and fixing method, wherein the core rod is used to fix the cutting section of the stent retriever, the cutting section includes multiple cutting rods, and multiple cutting rods form a hollow area;The core rod includes: head, the side of the head is provided with a convex array, and the convex array is used to be arranged in the hollow area;Clamping portion is connected with the head along the axial direction of the core rod.The above technical scheme is used, when cutting section is displaced relative to core rod under the action of braiding wire, because the convex array is arranged in the hollow area, the convex array will be in contact with the cutting rod that forms the hollow area, so that cutting section can be stopped moving relative to core rod, so that the relative displacement between cutting section and core rod in braiding process can be reduced, and the braiding precision of the braiding section of stent retriever is improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of medical devices, in particular to a core rod, braiding equipment and fixing method. BACKGROUND

[0002] The thrombus-removing stent is a commonly used medical device for percutaneous mechanic thrombectomy (PMT), which is mainly used for removing thrombus in the human body and restoring the patency of the lumen. The thrombus-removing stent usually comprises a cutting section and a braiding section. In use, the cutting section is used to cut and separate the thrombus, and the braiding section is used to collect the thrombus.

[0003] In the preparation of the thrombus-removing stent, the cutting section is first prepared, then the cutting section is sleeved on the core rod, then the braiding wire is threaded at one end of the cutting section and connected with the corresponding spindle on the braiding machine, and the braiding machine is started to braid to manufacture the braiding section. Therefore, how to provide a technical solution to improve the braiding precision of the thrombus-removing stent has become a technical problem to be solved by the person skilled in the art. SUMMARY

[0004] Therefore, the embodiment of the present application provides a core rod, braiding equipment and fixing method, which can improve the braiding precision of the thrombus-removing stent.

[0005] The embodiment of the present application provides a core rod, which is used for fixing the cutting section of the thrombus-removing stent, the cutting section comprises a plurality of cutting rods, and the plurality of cutting rods form a hollow region; the core rod comprises:

[0006] a head portion, a side surface of the head portion is provided with a protrusion array, and the protrusion array is used for threading the hollow region;

[0007] a clamping portion connected with the head portion in the axial direction of the core rod.

[0008] Optionally, the number of the hollow regions is multiple, and the protrusion array comprises:

[0009] a plurality of protrusion units, the plurality of protrusion units are arrayed along the circumferential direction of the core rod; wherein one protrusion unit is used for threading a corresponding hollow region.

[0010] Optionally, the protrusion unit comprises:

[0011] a first protrusion and a second protrusion which are arranged at intervals;

[0012] In the circumferential direction of the core rod, the first protrusion of the protrusion unit is opposite to the second protrusion of an adjacent protrusion unit, and the second protrusion of the protrusion unit is opposite to the first protrusion of another adjacent protrusion unit.

[0013] Optionally, the first protrusion is wedge-shaped along the radial end of the head.

[0014] The second protrusion is wedge-shaped along the radial end of the head.

[0015] Optionally, a first accommodating groove is formed on the side surface of the head; along the axial direction of the mandrel, the first accommodating groove is located on the side of the protrusion array away from the clamping portion, and the first accommodating groove is used for accommodating the connecting ring of the cutting segment.

[0016] Optionally, a second accommodating groove is formed on the side surface of the head; along the axial direction of the mandrel, the second accommodating groove is located on the side of the protrusion array close to the clamping portion, and the second accommodating groove is used for accommodating the braided wire passing through the wire hole of the cutting segment.

[0017] Optionally, a plurality of adjusting holes are formed on the side surface of the head; the plurality of adjusting holes are arranged in a circumferential array along the head.

[0018] Correspondingly, the embodiment of the present application also provides a braiding device, comprising:

[0019] A braiding machine, wherein the braiding machine has a mounting hole;

[0020] The clamping portion of the mandrel as described in any one of the preceding embodiments is inserted into the mounting hole.

[0021] Correspondingly, the embodiment of the present application also provides a fixing method, comprising:

[0022] Providing a cutting segment and a mandrel as described in any one of the preceding embodiments;

[0023] Sleeving the cutting segment from the head of the mandrel;

[0024] Adjusting the position of the cutting segment so that the protrusion array of the mandrel passes through the hollowed-out area of the cutting segment.

[0025] Optionally, after adjusting the position of the cutting segment so that the protrusion array of the mandrel passes through the hollowed-out area of the cutting segment, the fixing method further comprises:

[0026] Wrapping the cutting segment with a fixing belt at the position of the protrusion array along the circumferential direction of the mandrel.

[0027] Optionally, the cutting segment is provided with a connecting ring away from the end of the clamping portion of the mandrel, and the projection of the connecting ring on the projection plane perpendicular to the axial direction of the cutting segment is located within the projection formed by the cutting rod of the cutting segment; a first accommodating groove is formed on the side surface of the head, and along the axial direction of the mandrel, the first accommodating groove is located on the side of the protrusion array away from the clamping portion.

[0028] After the cutting section is sleeved on the head of the mandrel, the fixing method further comprises:

[0029] The position of the cutting section is adjusted so that the connecting ring is located in the first accommodating groove.

[0030] Optionally, the cutting section has a threading hole at one end close to the clamping section of the mandrel; the side surface of the head is provided with a second accommodating groove, which is located at one side of the array of protrusions close to the clamping section along the axial direction of the mandrel;

[0031] After the cutting section is sleeved on the head of the mandrel, the fixing method further comprises:

[0032] The position of the cutting section is adjusted so that the threading hole is located at the second accommodating groove.

[0033] Optionally, the side surface of the head is provided with a plurality of adjusting holes; the plurality of adjusting holes are arranged in an array along the circumferential direction of the head;

[0034] After the cutting section is sleeved on the head of the mandrel, the fixing method further comprises:

[0035] The shape of the cutting rod of the cutting section is adjusted by cooperation of the steel needle and the adjusting hole.

[0036] Compared with the prior art, the technical scheme of the embodiment of the present application has the following advantages:

[0037] The mandrel provided by the embodiment of the present application is used for fixing the cutting section, the cutting section includes a plurality of cutting rods, and the plurality of cutting rods form a hollow region; when the cutting section is sleeved on the head of the mandrel, the array of protrusions of the head can pass through the hollow region. When the cutting section is displaced relative to the mandrel under the action of the braiding wire, since the array of protrusions passes through the hollow region, the array of protrusions will be in contact with the cutting rods forming the hollow region, so that the cutting section can be stopped from moving relative to the mandrel, thereby reducing the relative displacement between the cutting section and the mandrel during braiding and improving the braiding precision of the braiding section of the stent.

[0038] In the braiding device provided by the embodiment of the present application, the cutting section is sleeved on the head of the mandrel, the array of protrusions passes through the hollow region, then the mandrel is fixed on the braiding machine, and the braiding wire is threaded through the cutting section and connected to the corresponding spindle in the braiding machine. When the cutting section is displaced relative to the mandrel under the action of the braiding wire, since the array of protrusions passes through the hollow region, the array of protrusions will be in contact with the cutting rods forming the hollow region, so that the cutting section can be stopped from moving relative to the mandrel, thereby reducing the relative displacement between the cutting section and the mandrel during braiding and improving the braiding precision of the braiding section of the stent.

[0039] The fixing method provided by the embodiment of the application provides a cutting section and a mandrel, the cutting section comprises a plurality of cutting rods, and the plurality of cutting rods form a hollow region; the mandrel comprises a head and a clamping portion connected to the head in the axial direction of the mandrel; a side surface of the head is provided with a protrusion array; when the cutting section is sleeved on the head, the protrusion array penetrates the hollow region. When the cutting section is displaced relative to the mandrel under the action of the braided wire, because the protrusion array penetrates the hollow region, the protrusion array will be in contact with the cutting rods forming the hollow region, so that the cutting section can be stopped from moving relative to the mandrel, the relative displacement between the cutting section and the mandrel in the braiding process is reduced, and therefore the braiding precision of the braided section of the stentriever is improved. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application or the prior art description. Obviously, the drawings described below are only some of the embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0041] Figure 1 A structural schematic diagram of a stentriever is shown;

[0042] Figure 2 A structural schematic diagram of a mandrel in the embodiment of the present application is shown;

[0043] Figure 3 A structural schematic diagram of a head of a mandrel in the embodiment of the present application is shown;

[0044] Figure 4 A structural schematic diagram of a cutting section fixed on a mandrel in the embodiment of the present application is shown; Figure 3 A partial enlarged view of part A in FIG. 8 is shown;

[0045] Figure 5 A structural schematic diagram of a cutting section fixed on a mandrel in the embodiment of the present application is shown;

[0046] Figure 6 A step flowchart of a fixing method in the embodiment of the present application is shown;

[0047] Figure 7 A specific step flowchart of a fixing method in the embodiment of the present application is shown. DETAILED DESCRIPTION

[0048] As described in the background, the stentriever is a commonly used medical device for mechanical thrombectomy (PMT), which is mainly used for removing blood clots in the human body and restoring the patency of the lumen.

[0049] Reference Figure 1 , Figure 1 A structure diagram of a thrombus extraction stent is shown.

[0050] As an example, the thrombus extraction stent comprises a cutting section M and a braiding section N, wherein the cutting section M is a hollow structure formed by a plurality of cutting rods m1, the braiding section N is a mesh structure formed by braiding a braiding wire n1, and one end of the braiding section N is connected to one end of the cutting section M. In use, the thrombus extraction stent first cuts and separates the thrombus in the blood vessel through the cutting section M, and then collects the thrombus through the braiding section N, so as to achieve the purpose of removing and collecting the thrombus.

[0051] The structures of the cutting section and the braiding section in the thrombus extraction stent are different, and are usually manufactured in stages.

[0052] As an example, the manufacturing steps of the thrombus extraction stent include: first, forming the cutting section by laser cutting a material; then, sleeving the cutting section on a braiding mandrel (referred to as a mandrel), and the braiding wire passes through the threading hole on the cutting rod at one end of the cutting section according to a specific threading rule; then, installing the mandrel on a braiding machine, connecting the braiding wire on the cutting section with the corresponding spindle on the braiding machine; and then, starting the braiding machine to braid, so as to manufacture the braiding section.

[0053] The inventor found in actual work that during the braiding process of the braiding machine, when the spindle pulls the braiding wire to manufacture the braiding section, the cutting section will displace relative to the mandrel under the action of the braiding wire, and the relative displacement between the cutting section and the mandrel will cause the braiding precision of the braiding section to decrease. Therefore, how to provide a mandrel to improve the braiding precision of the thrombus extraction stent has become a technical problem to be solved by those skilled in the art.

[0054] In order to solve the above technical problem, the embodiment of the present application provides a mandrel for fixing a cutting section of a thrombus extraction stent, the cutting section comprising a plurality of cutting rods, and the plurality of cutting rods forming a hollow region; the mandrel comprising: a head portion, a side surface of the head portion being provided with a protrusion array, the protrusion array being used for threading the hollow region; and a clamping portion connected to the head portion in the axial direction of the mandrel.

[0055] The mandrel provided by the embodiment of the present application is used for fixing the cutting section, the cutting section comprises a plurality of cutting rods, and the plurality of cutting rods form a hollow region, when the cutting section is sleeved on the head portion of the mandrel, the protrusion array of the head portion can thread the hollow region. When the cutting section displaces relative to the mandrel under the action of the braiding wire, since the protrusion array threads the hollow region, the protrusion array will abut against the cutting rod forming the hollow region, so as to enable the cutting section to stop moving relative to the mandrel, thereby reducing the relative displacement between the cutting section and the mandrel during the braiding process, and improving the braiding precision of the braiding section of the thrombus extraction stent.

[0056] To enable those skilled in the art to better understand and implement the embodiments of the present invention, the following describes the concept, scheme, principle, and advantages of the embodiments of the present invention in detail with reference to the accompanying drawings and through specific application examples.

[0057] Reference Figures 2 to 5 ,in, Figure 2 A schematic diagram of a mandrel structure according to an embodiment of the present invention is shown. Figure 3 This diagram illustrates the structure of the head of a mandrel according to an embodiment of the present invention. Figure 4 It shows Figure 3 A magnified view of part A in the middle. Figure 5 A schematic diagram of a cut segment fixed on a mandrel is shown in an embodiment of the present invention.

[0058] Combined with reference Figures 2 to 5 The mandrel 1 is used to fix the cutting segment M, which includes multiple cutting rods m1, forming a hollow area O. The mandrel 1 may include:

[0059] The head 11 has a raised array 2 on its side; the raised array 2 is used to pass through the hollow area O.

[0060] A clamping part 12 is connected to the head 11 along the axial direction of the mandrel 1.

[0061] In the mandrel provided in this embodiment of the invention, the cutting segment M fixed by the mandrel 1 includes multiple cutting rods m1, which form a hollow area O. The protrusion array 2 is used to pass through the hollow area O. When the cutting segment M is displaced relative to the head 11 under the action of the braiding thread, the protrusion array 2 will abut against the cutting rods m1 that form the hollow area O because it passes through the hollow area O. This allows the cutting segment M to stop moving relative to the head 11, reducing the relative displacement between the cutting segment M and the mandrel 1 during the braiding process, thereby improving the braiding accuracy of the braided segment of the thimble removal bracket.

[0062] In this embodiment, multiple cutting rods m1 form multiple hollow areas O. The protrusion array 2 may include multiple protrusion units 21, which are distributed in a circumferential array along the head 11. One protrusion unit 21 is used to pass through a corresponding hollow area O.

[0063] Specifically, multiple protruding units 21 are arranged in a circumferential array along the head 11. One protruding unit 21 is used to pass through a corresponding hollow area O. When the cutting segment M is fitted onto the head 11, multiple protruding units 21 pass through multiple hollow areas O respectively. The multiple hollow areas form the cutting rod m1 of the hollow area O, which is embedded between adjacent protruding units 21. When the cutting segment M is displaced relative to the core rod 1 under the action of the braided wire, the cutting rod m1 abuts against the adjacent protruding unit 21.

[0064] In the embodiment, the shape of the opposite side surface of the adjacent protruding units 21 along the circumference of the mandrel 1 is matched with the shape of the cutting rod m1 embedded between the adjacent protruding units 21, so that the contact area between the protruding units 21 and the cutting rod m1 can be increased, and the damage of the cutting segment M caused by the protruding units 21 during the weaving process can be reduced.

[0065] In the embodiment, the protruding unit 21 can include first protrusions 211 and second protrusions 212 arranged at intervals, and the first protrusion 211 of the protruding unit 21 is opposite to the second protrusion 212 of an adjacent protruding unit 21 along the circumference of the mandrel 1, and the second protrusion 212 of the protruding unit 21 is opposite to the first protrusion 211 of another adjacent protruding unit 21.

[0066] Specifically, when the cutting segment M is sleeved on the mandrel 1, the first protrusion 211 and the second protrusion 212 of the same protruding unit 21 pass through the same hollow region O, and the cutting rod m1 forming the hollow region O is embedded between the first protrusion 211 and the second protrusion 212 of the adjacent protruding unit 21; when the cutting segment M is displaced relative to the mandrel 1 under the action of the weaving wire, the cutting rod m1 respectively abuts against the first protrusion 211 and the second protrusion 212 of the adjacent protruding unit 21.

[0067] In the embodiment, the end of the first protrusion 211 and the second protrusion 212 along the radial direction of the mandrel 1 can be wedge-shaped, which is conducive to guiding the cutting rod m1 to be embedded between the adjacent protruding units 21.

[0068] In the embodiment, the end of the head 11 away from the clamping portion 12 can be provided in a circular truncated cone shape, so that the outer diameter of the end surface of the head 11 away from the clamping portion 12 is smaller than the inner diameter of the cutting segment M, thereby reducing the difficulty of sleeving the cutting segment M on the head 11.

[0069] In the embodiment, the outer diameter of the side surface of the head 11 is matched with the inner diameter of the cutting segment M.

[0070] In the embodiment, the side surface of the head 11 can be provided with a first accommodating groove 3, and the first accommodating groove 3 is located on the side of the protruding array 2 away from the clamping portion 12 along the axial direction of the mandrel 1.

[0071] Specifically, when the cutting segment M is sleeved on the head 11, if the cutting segment M corresponding to the position of the first accommodating groove 3 has a connecting ring m2, the projection of the connecting ring m2 on the projection plane perpendicular to the axial direction of the cutting segment M is located in the projection formed by the cutting rod m1, the first accommodating groove 3 can accommodate the connecting ring m2 as a retreat space, so as to reduce the protrusion of the cutting segment M at the connecting ring m2 caused by the overlap of the connecting ring m2 and the cutting rod m1, and thus the deformation amount of the cutting segment M during the fixing of the cutting segment M by the mandrel 1 can be reduced.

[0072] In the embodiment, the side surface of the head 11 can be provided with a second accommodating groove 4, and the second accommodating groove 4 is located on the side of the protrusion array 2 close to the clamping portion 12 along the axial direction of the mandrel 1.

[0073] Specifically, the cutting rod m1 is provided with a threading hole m3, and the braided wire is threaded through the cutting segment M through the threading hole m3. When the cutting segment M is sleeved on the head 11, the position of the second accommodating groove 4 corresponds to the position of the threading hole m3, and part of the braided wire enters the cutting segment M through the threading hole m3. The second accommodating groove 4 can accommodate the part of the braided wire entering the cutting segment M as a retreat space, so as to reduce the protrusion of the cutting segment M at the threading hole m3 caused by the overlap of the part of the braided wire entering the cutting segment M and the cutting segment M, and thus the deformation amount of the cutting segment M during the fixing of the cutting segment M by the mandrel 1 can be reduced. At the same time, the second accommodating groove 4 can reduce the difficulty of the braided wire passing through the threading hole m3 as a retreat space.

[0074] It should be noted that in other examples, the braided wire can also pass through the hollow region formed by the cutting rod m1 at the end of the cutting segment M close to the clamping portion 12 to thread through the cutting segment M. When the cutting segment M is sleeved on the head 11, the position of the second accommodating groove 4 corresponds to the threading position of the braided wire on the cutting segment M.

[0075] In the embodiment, the second accommodating groove 4 can be an annular groove extending along the circumferential direction of the side surface of the head 11.

[0076] Specifically, the threading position of the braided wire on the cutting segment M is distributed along the circumferential direction of the cutting segment M, and by arranging the second accommodating groove 4 as an annular groove extending along the circumferential direction of the side surface of the head 11, the second accommodating groove 4 can be adapted to the threading position of the braided wire on the cutting segment M.

[0077] In the embodiment, the side surface of the head 11 can be provided with a plurality of adjusting holes 5, and the plurality of adjusting holes 5 are arranged in an array along the circumferential direction of the head 11.

[0078] Specifically, when the cutting section M is sleeved on the head 11, a steel needle is inserted into the adjusting hole 5 near the cutting rod m1 to be adjusted, and the cutting rod m1 is pressed by the needle body of the steel needle due to the interference between the protrusion array 2 and the cutting rod m1 forming the hollow region O, so that the shape of the cutting rod m1 can be finely adjusted, so that the actual shape of the cutting rod m1 is more consistent with the expected shape, thereby improving the quality of the cutting section M.

[0079] In the embodiment, the head 11 and the clamping portion 12 are integrally formed. In other examples, the connection relationship between the head 11 and the clamping portion 12 is one of thread connection or plug-in connection and other detachable connection modes. By detachable connection of the head 11 and the clamping portion 12, it is beneficial to the replacement and maintenance of the head 11 and the clamping portion 12 and the free combination between different models of the head 11 and the clamping portion 12.

[0080] In the embodiment, the clamping portion 12 is used to connect the braiding machine.

[0081] In the embodiment, the core rod 1 can be made of stainless steel or titanium alloy by 3D printing.

[0082] In the embodiment, the core rod 1 has a tubular structure, which is beneficial to reduce the manufacturing cost.

[0083] Correspondingly, the embodiment of the application also provides a braiding device for forming a braiding section.

[0084] In the embodiment, the braiding device can include a braiding machine and a core rod, wherein the braiding machine includes a plurality of spindles; the core rod adopts the core rod of any of the preceding embodiments, and the core rod is detachably connected with the braiding machine.

[0085] In the braiding device provided by the embodiment of the application, the cutting section is sleeved on the head of the core rod, the protrusion array penetrates the hollow region, then the core rod is fixed on the braiding machine, the braiding wire is penetrated in the cutting section and connected with the corresponding spindle in the braiding machine. When the cutting section moves relative to the core rod under the action of the braiding wire, the protrusion array will interfere with the cutting rod forming the hollow region due to the penetration of the protrusion array in the hollow region, so that the cutting section can stop moving relative to the core rod, thereby reducing the relative displacement between the cutting section and the core rod in the braiding process, and improving the braiding precision of the braiding section of the stent.

[0086] In the embodiment, the braiding machine has a mounting hole, and the clamping portion of the core rod is inserted into the mounting hole to be detachably connected with the braiding machine.

[0087] Correspondingly, the embodiment of the application also provides a fixing method. Figure 6 A step flowchart of a fixing method in the embodiment of the application is shown.

[0088] In the embodiment, the fixing method can include the following basic steps:

[0089] Step S1, providing the mandrel and the cutting segment provided in the foregoing embodiments;

[0090] Step S2, sleeving the cutting segment from the head of the mandrel;

[0091] Step S3, adjusting the position of the cutting segment, so that the array of protrusions of the mandrel penetrates the hollowed-out region of the cutting segment.

[0092] In the fixing method provided by the embodiment, the cutting segment and the mandrel are provided, the cutting segment includes a plurality of cutting rods, and the plurality of cutting rods form a hollowed-out region. The mandrel includes a head and a clamping portion connected to the head in the axial direction of the mandrel. The side surface of the head is provided with an array of protrusions. When the cutting segment is sleeved on the head, the array of protrusions penetrates the hollowed-out region. When the cutting segment is displaced relative to the mandrel under the action of the braiding wire, because the array of protrusions penetrates the hollowed-out region, the array of protrusions will be in contact with the cutting rods forming the hollowed-out region, so that the cutting segment can be stopped from moving relative to the mandrel, the relative displacement between the cutting segment and the mandrel in the braiding process is reduced, and the braiding precision of the braiding segment of the stent is improved.

[0093] In order for those skilled in the art to better understand and implement the embodiments of the present application, the concepts, schemes, principles and advantages of the embodiments of the present application are described in detail below with reference to the drawings and through specific application examples.

[0094] Combined with reference Figures 2 to 7 , wherein, Figure 7 A specific step flowchart of a fixing method in the embodiment of the present application is shown.

[0095] Step S1 is performed: the mandrel and the cutting segment provided in the foregoing embodiments are provided.

[0096] Specifically, the detailed description of the mandrel 1 and the cutting segment M is referred to the description of the mandrel 1 and the cutting segment M in the foregoing examples, which is not repeated here.

[0097] Step S2 is performed: the cutting segment is sleeved from the head of the mandrel.

[0098] In the embodiment, the end of the head 11 away from the clamping portion 12 can be provided in a circular truncated cone shape, so that the outer diameter of the end surface of the head 11 away from the clamping portion 12 is smaller than the inner diameter of the cutting segment M, thereby reducing the difficulty of sleeving the cutting segment M on the head 11.

[0099] Adjusting the position of the cutting segment so that the protrusion array of the core rod passes through the hollowed region of the cutting segment.

[0100] In this embodiment, the outer diameter of the side surface of the head 11 is matched with the inner diameter of the cutting segment M; when the cutting segment M is sleeved on the head 11, the position of the cutting segment M is adjusted so that the cutting rod m1 of the cutting segment M is in contact with the side surface of the head 11, and the protrusion array 2 passes through the hollowed region O formed by the cutting rod m1.

[0101] In this embodiment, the plurality of cutting rods m1 form a plurality of hollowed regions O, and the protrusion array 2 can include a plurality of protrusion units 21 which are arranged in a circumferential array along the core rod 1, wherein one protrusion unit 21 corresponds to one hollowed region O; when the cutting segment M is sleeved on the core rod 1, the position of the cutting segment M is adjusted so that the plurality of protrusion units 21 respectively pass through the corresponding hollowed regions O arranged in a circumferential array along the core rod 1, so that the cutting rod forming the hollowed region O is embedded between the adjacent protrusion units 21.

[0102] In this embodiment, the protrusion unit 21 can include a first protrusion 211 and a second protrusion 212 which are arranged at intervals, and the first protrusion 211 of the protrusion unit 21 is opposite to the second protrusion 212 of an adjacent protrusion unit 21 along the circumferential direction of the core rod 1, and the second protrusion 212 of the protrusion unit 21 is opposite to the first protrusion 211 of another adjacent protrusion unit 21; when the cutting segment M is sleeved on the core rod 1, the position of the cutting segment M is adjusted so that the first protrusion 211 and the second protrusion 212 of the same protrusion unit 21 pass through the same hollowed region O, and the cutting rod m1 forming the hollowed region O is embedded between the first protrusion 211 and the second protrusion 212 of the adjacent protrusion unit 21.

[0103] In this embodiment, after step S3 is performed, step S4 can also be performed:

[0104] The cutting segment is wound by the fixing band at the position of the protrusion array along the circumferential direction of the core rod.

[0105] Specifically, after the protrusion array 2 passes through the hollowed region O, the protrusion array 2 is in contact with the cutting rod m1 forming the hollowed region O along the circumferential direction of the core rod 1, and the cutting segment M is wound by the fixing band at the position of the protrusion array 2 along the circumferential direction of the head 11, which can reduce the deformation of the cutting rod m1 along the radial direction of the core rod 1 under the traction of the braiding wire, and reduce the probability of the cutting rod m1 separating from the protrusion array 2, so as to further reduce the relative displacement between the cutting segment M and the core rod 1 during the braiding process, thereby improving the braiding precision of the braiding segment.

[0106] In the embodiment, the end of the cutting section M away from the clamping portion 12 is provided with a connecting ring m2, a projection of the connecting ring m2 on a projection plane perpendicular to the axial direction of the cutting section M is located within the projection formed by the cutting rod m1; the side surface of the head portion 11 can be provided with a first accommodating groove 3, which is located on the side of the protrusion array 2 away from the clamping portion 12 along the axial direction of the core rod 1.

[0107] After step S2 is performed, step S5 of adjusting the position of the cutting section so that the connecting ring of the cutting section is located in the first accommodating groove can also be performed.

[0108] Specifically, the first accommodating groove 3 serves as a retreat space and can accommodate the connecting ring m2, thereby reducing the protrusion of the cutting section M at the connecting ring m2 caused by the overlap of the connecting ring m2 and the cutting rod m1, and reducing the deformation amount of the cutting section M during the sleeving of the cutting section M on the core rod 1.

[0109] In the embodiment, the side surface of the head portion 11 is provided with a second accommodating groove 4, which is located on the side of the protrusion array 2 close to the clamping portion 12 along the axial direction of the core rod 1; the end of the cutting section M close to the clamping portion 12 has a threading hole m3.

[0110] After step S2 is performed, step S6 of adjusting the position of the cutting section so that the threading hole of the cutting section is located at the second accommodating groove can also be performed.

[0111] Specifically, when the braided wire is threaded through the cutting section M, part of the braided wire enters the cutting section M through the threading hole m3, and when the cutting section M is sleeved on the head portion 11, the threading hole m3 is located at the second accommodating groove 4, which serves as a retreat space and can accommodate the part of the braided wire that enters the cutting section M, thereby reducing the protrusion of the cutting section M at the threading hole m3 caused by the overlap of the part of the braided wire that enters the cutting section M and the cutting section M, and reducing the deformation amount of the cutting section M during the fixing of the cutting section M on the core rod 1; at the same time, the second accommodating groove 4 serves as a retreat space and can reduce the difficulty of threading the braided wire through the threading hole m3.

[0112] In the embodiment, the side surface of the head portion 11 can be provided with a plurality of adjusting holes 5, which are arranged in an array along the circumferential direction of the head portion 11; after step S2 is performed, step S7 can also be performed:

[0113] The shape of the cutting rod of the cutting section is adjusted through the cooperation of the steel needle and the adjusting hole.

[0114] Specifically, when the cutting section M is sleeved on the head 11, the steel needle is inserted into the adjusting hole 5 near the cutting rod m1 to be adjusted, and the cutting rod m1 is pressed by the needle body of the steel needle due to the interference between the array of protrusions 2 and the cutting rod m1 forming the hollowed region O, so that the shape of the cutting rod m1 can be finely adjusted, so that the actual shape of the cutting rod m1 is more consistent with the expected shape, thereby improving the quality of the cutting section.

[0115] It should be noted that the execution order of steps S3, S5, S6 and S7 of the embodiment of the present application is not specifically limited, for example, step S3 can be executed first after step S2 is executed, and then steps S5, S6 or S7 are executed; for another example, step S5 can be executed first after step S2 is executed, and then step S3 is executed; the embodiment of the present application does not specifically limit the order of steps, as long as the relative displacement between the cutting section and the core rod during the braiding process and the deformation amount of the cutting section during the process of sleeving the core rod are reduced.

[0116] It can be understood that the above describes a plurality of embodiment schemes provided by the embodiment of the present application, and each optional implementation and specific example introduced by each embodiment scheme can be combined, cross-referenced in the case of no conflict, thereby extending a plurality of possible embodiment schemes, which can be considered as the disclosed and disclosed embodiment schemes of the present application.

[0117] It should be noted that the "example" or "embodiment" referred to in the present specification refers to a specific feature, structure or characteristic that can be included in at least one implementation of the embodiment of the present application. And in the description of the present specification, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" and the like can be explicitly or implicitly included one or more features. Moreover, the terms "first", "second" and the like are used to distinguish similar objects, and do not have to be used to describe a specific order or indicate importance. It can be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiment of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0118] Although the embodiment of the present application is disclosed as above, the present application is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, therefore the protection scope of the present specification should be limited by the scope defined by the claims.

Claims

1. A mandrel, characterized in that, The mandrel is used to fix the cut section of the thrombectomy bracket, the cut section including multiple cutting rods forming a hollow area; the mandrel includes: The head has a raised array on its side, which is used to pass through the hollow area; there are multiple hollow areas, and the raised array includes: multiple raised units distributed in a circumferential array along the mandrel; and a clamping part connected to the head along the axial direction of the mandrel.

2. The mandrel according to claim 1, characterized in that, The protrusion unit includes: The first and second protrusions are spaced apart; Along the circumference of the mandrel, the first protrusion of the protrusion unit is opposite to the second protrusion of an adjacent protrusion unit, and the second protrusion of the protrusion unit is opposite to the first protrusion of another adjacent protrusion unit.

3. The mandrel according to claim 2, characterized in that, The first protrusion has a wedge-shaped end along the radial direction of the head; The second protrusion is wedge-shaped at its radial end along the head.

4. The mandrel according to claim 1, characterized in that, A first receiving groove is provided on the side of the head; along the axial direction of the mandrel, the first receiving groove is located on the side of the protrusion array away from the clamping part, and the first receiving groove is used to accommodate the connecting ring of the cutting segment.

5. The mandrel according to claim 1, characterized in that, A second receiving groove is provided on the side of the head; along the axial direction of the mandrel, the second receiving groove is located on the side of the protrusion array near the clamping part, and the second receiving groove is used to receive the braided wire passing through the thread hole of the cutting section.

6. The mandrel according to claim 1, characterized in that, The head has multiple adjustment holes on its side; the multiple adjustment holes are distributed in a circumferential array along the head.

7. A weaving device, characterized in that, include: A braiding machine having mounting holes; The mandrel as described in any one of claims 1 to 6, wherein the clamping portion of the mandrel is inserted into the mounting hole.

8. A fixing method, characterized in that, include: Provides a cut segment and a core rod as described in any one of claims 1 to 6; Insert the cut segment through the head of the mandrel; Adjust the position of the cutting segment so that the array of protrusions on the mandrel passes through the hollow area of ​​the cutting segment.

9. The fixing method according to claim 8, characterized in that, After adjusting the position of the cut segment so that the array of protrusions on the mandrel passes through the hollowed-out area of ​​the cut segment, the fixing method further includes: The cut segment is wound around the circumference of the mandrel at the location of the protrusion array by a fixing strap.

10. The fixing method according to claim 8, characterized in that, A connecting ring is provided at the end of the cutting segment away from the clamping part of the mandrel. The projection of the connecting ring on the projection plane perpendicular to the axial direction of the cutting segment is located within the projection formed by the cutting rod of the cutting segment. A first receiving groove is provided on the side of the head along the axial direction of the mandrel. The first receiving groove is located on the side of the protrusion array away from the clamping part. After the cut segment is inserted from the head of the mandrel, the fixing method further includes: Adjust the position of the cutting segment so that the connecting ring of the cutting segment is located in the first receiving groove.

11. The fixing method according to claim 8, characterized in that, The cutting section has a wire-passing hole at one end near the clamping section of the mandrel; a second receiving groove is provided on the side of the head, along the axial direction of the mandrel, and the second receiving groove is located on the side of the protrusion array near the clamping part. After the cut segment is inserted from the head of the mandrel, the fixing method further includes: Adjust the position of the cutting segment so that the thread hole of the cutting segment is located at the second receiving groove.

12. The fixing method according to claim 8, characterized in that, The head has multiple adjustment holes on its side; Multiple adjustment holes are distributed in a circumferential array along the head; After the cut segment is inserted from the head of the mandrel, the fixing method further includes: The shape of the cutting rod of the cutting section is adjusted by the cooperation of the steel needle and the adjustment hole.

Images