A dense net support braiding tool
By using a dense mesh support weaving fixture with a mandrel and retaining ring structure on a weaving machine, the problems of low weaving efficiency and poor versatility are solved, enabling the weaving of various dense mesh support head end structures, increasing anchoring force and convenience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- EASYCESS MEDICAL LTD
- Filing Date
- 2023-05-19
- Publication Date
- 2026-07-03
AI Technical Summary
The existing dense mesh support weaving process is inefficient and the weaving machines have poor versatility, failing to meet different usage needs.
It adopts a mandrel and clasp structure. The mandrel is equipped with positioning holes and hooks. Positioning strips are inserted into the positioning holes, and the hooks are used to hook the positioning strips. By changing the arrangement of the positioning holes, the same weaving machine can weave a variety of dense mesh supports with different head-end closed structures, increasing its versatility.
It improves the versatility of the braiding machine, ensures that the head and tail ends of the dense mesh support form a trumpet-shaped structure to increase the anchoring force, reduces the weight of the core rod for easy installation, and avoids the positioning strip from affecting the braiding process.
Smart Images
Figure CN116676713B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of surgical interventional medical devices, and more specifically, to a dense mesh stent weaving tool. Background Technology
[0002] The latest interventional treatment device for intracranial aneurysms is the dense mesh stent. This stent is made by weaving together extremely fine cobalt-cadmium-nickel alloy wires, platinum-tungsten alloy wires, nickel-titanium wires, and platinum-iridium wires into a small-diameter, high-PPI dense mesh stent. The high surface tension between the stent meshes forms a barrier at the neck of the aneurysm, slowing the blood flow into the aneurysm, reducing the flow rate, and altering the direction of blood flow. Blood flows along the lumen of the dense mesh stent, further causing coagulation within the aneurysm, forming an embolus. Active substances in the blood vessel adhere to the surface of the dense mesh stent at the neck, causing endothelialization of the stent surface and achieving vascular reconstruction.
[0003] Existing mesh support fabrication processes typically employ hand weaving or machine weaving. For example, one method utilizes a fixture with multiple protrusions at one end. The fabrication method includes: a braiding wire is woven spirally from the end of the fixture without protrusions towards the end with protrusions; when the braiding wire reaches the end with protrusions, it bypasses one of the protrusions and turns back, continuing spirally along the fixture towards the end without protrusions; after weaving one wire, the above steps are repeated for the remaining wires until all wires are woven into a mesh; the woven mesh support is then shaped.
[0004] Hand weaving is inefficient and unsuitable for industrial production. While machine weaving methods, as described above, require specific machines for each type of support structure, resulting in poor versatility and an inability to meet diverse application needs. Summary of the Invention
[0005] To overcome the problem of poor universality of the weaving equipment in the prior art, the present invention provides a weaving fixture for dense mesh supports.
[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a dense mesh support weaving fixture, including a mandrel and a retaining ring; the retaining ring is disposed at one end of the mandrel; the retaining ring of the mandrel has a plurality of positioning holes in the circumferential direction, and positioning strips are inserted into the positioning holes; the retaining ring has a plurality of hooks in the circumferential direction for accommodating and holding the positioning strips.
[0007] The mandrel is used to install on the braiding machine and provides skeleton-like support for the braided yarns. The arrangement of the positioning holes determines the arrangement of the positioning strips, which are used to hold the braided yarns, thus forming a closed head structure of the dense mesh support. Different positioning strip arrangements result in different closed head structures of the dense mesh support. By replacing the mandrel with a positioning hole with a different arrangement, the same braiding machine can weave a variety of dense mesh supports with different closed head structures, improving versatility. The hook is used to hook and hold the positioning strips, preventing them from interfering with the operation of the braiding machine.
[0008] Furthermore, each of the hook contents includes one or more positioning strips.
[0009] Furthermore, one end of the mandrel is a head end, the radius of the head end is larger than that of the mandrel, a first inclined surface is provided at the connection between the head end and the mandrel, and the retaining ring is provided on the head end; the positioning hole is provided on the first inclined surface; a ring post is provided at the end of the mandrel away from the head end, and a second inclined surface is provided at the end of the ring post facing the head end.
[0010] Furthermore, the head end of the mandrel is integrally formed with the mandrel, and the head end is coaxial with the mandrel.
[0011] By adopting the above technical solution, the radius of the head end is larger than that of the mandrel, allowing a first inclined plane to be formed at the intersection of the head end and the mandrel. The clasp is located above the first inclined plane, so that when the hook on the clasp hooks the positioning strip, the positioning strip extends towards the first inclined plane away from the second inclined plane, thus preventing the positioning strip from extending to the position between the first and second inclined planes and affecting the weaving and forming of the dense mesh stent. The positioning hole is located on the first inclined plane. Since the weaving direction of the dense mesh stent starts from the position of the positioning hole, the starting end of the dense mesh stent can have a trumpet shape due to the presence of the first inclined plane. Similarly, the annulus is the ending end of the dense mesh stent during weaving. When the dense mesh stent reaches the position of the annulus, it will also form a trumpet shape at the ending end of the dense mesh stent due to the presence of the second inclined plane, thus making both ends of the dense mesh stent trumpet-shaped, thereby increasing the anchoring force of the dense mesh stent in the blood vessel.
[0012] Furthermore, the positioning hole includes a first group of holes and a second group of holes, the first group of holes and the second group of holes are arranged alternately along the circumference of the mandrel, and the first group of holes is located on the side of the second group of holes away from the annulus.
[0013] Furthermore, the retaining ring includes an mounting part and a retaining part, the mounting part having a first mounting hole, and the retaining hook being circumferentially disposed on the retaining part.
[0014] Furthermore, the annular post is movably fitted onto the mandrel, and the annular post is provided with a second mounting hole.
[0015] Furthermore, the annular column includes a contracting section and an expanding section; the contracting section is located on the side of the expanding section near the first inclined surface; the second inclined surface is located on the side of the contracting section near the first inclined surface; the diameter of the expanding section is larger than that of the contracting section.
[0016] Furthermore, the core rod is hollow inside.
[0017] Furthermore, the distance between the retaining ring and the first inclined surface is 15-20 mm.
[0018] On the other hand, the present invention also provides a method for weaving a dense mesh support using a dense mesh support weaving fixture, comprising the following steps:
[0019] S1. Insert the positioning strip into the positioning hole;
[0020] S2. Hang the braided yarn on the positioning strip, and then hook the positioning strip into the hook. Each hook contains several positioning strips.
[0021] S3. Install the dense mesh support weaving fixture on the weaving machine, and weaving can begin. During weaving, the weaving wires are woven into shape on the mandrel along the direction from the head end to the ring post.
[0022] S4. When the braided yarn reaches the position of the second inclined plane on the mandrel, the braiding is completed, and a complete dense mesh support is formed on the mandrel. After the braiding is completed, remove the ring post from the mandrel and remove the positioning strip from the positioning hole. Then the dense mesh support can be removed from the end of the mandrel away from the head end.
[0023] Compared with the prior art, the beneficial effects of the present invention are:
[0024] 1. By setting multiple positioning holes on the mandrel and inserting positioning strips into the positioning holes, the positioning strips are used to hold the braiding threads, thereby forming a closed head structure of the dense mesh support. Different arrangement of positioning strips results in different closed head structures of the dense mesh support. By replacing the mandrel with positioning holes of different arrangement for the braiding machine, the same braiding machine can braid a variety of dense mesh supports with different closed head structures, thus improving versatility.
[0025] 2. By setting a hook, the positioning strip can be hooked in the hook. At this time, the positioning strip is in a position as close as possible to the mandrel, thereby avoiding the positioning strip affecting the weaving of the braided yarn during the operation of the braiding machine;
[0026] 3. By setting a first inclined surface at the head end of the mandrel and a second inclined surface on the annulus, the first and second inclined surfaces enable the head and tail ends of the dense mesh stent woven on the mandrel to form a funnel shape, thereby increasing the anchoring force of the dense mesh stent in the blood vessel.
[0027] 4. The hollow core rod reduces its weight, making it easier to move and install. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a dense mesh support weaving fixture of the present invention;
[0029] Figure 2 This is a schematic diagram of the overall structure from another perspective of an embodiment of a dense mesh support weaving fixture of the present invention;
[0030] Figure 3 This is a schematic diagram of the process of weaving a dense mesh support using a dense mesh support weaving fixture in an embodiment of the present invention.
[0031] Figure 4 yes Figure 3 Enlarged view of part A in the middle.
[0032] In the attached diagram: 1. Mandrel; 2. Snap ring; 21. Snap hook; 22. Mounting part; 23. Snap-fit part; 24. First mounting hole; 3. Positioning hole; 31. First set of holes; 32. Second set of holes; 4. Positioning strip; 5. Head end; 6. First inclined surface; 7. Ring post; 71. Second mounting hole; 72. Contraction section; 73. Expansion section; 8. Second inclined surface; 9. Hanging hole. Detailed Implementation
[0033] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.
[0034] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0035] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings:
[0036] Example 1
[0037] Reference Figures 1 to 4 This is an embodiment 1 of a dense mesh support weaving fixture of the present invention, including a core rod 1 and a retaining ring 2; the retaining ring 2 is disposed at one end of the core rod 1; the core rod 1 is provided with a plurality of positioning holes 3 in the circumferential direction, and positioning strips 4 are inserted into the positioning holes 3; the retaining ring 2 is provided with a plurality of hooks 21 in the circumferential direction for accommodating and holding the positioning strips 4.
[0038] The cylindrical mandrel 1 is used to be installed on the braiding machine and provides a skeleton-like support for the braided yarn. The arrangement of the positioning holes 3 determines the arrangement of the positioning strips 4, which are used to hold the braided yarn, thus forming the closed structure of the head end 5 of the dense mesh support. Different arrangements of the positioning strips 4 result in different closed structures of the head end 5 of the dense mesh support. By replacing the mandrel 1 with positioning holes 3 with different arrangements, the same braiding machine can braid a variety of dense mesh supports with different closed structures of the head end 5, improving its versatility. The hook 21 is used to hook and accommodate the positioning strips 4 to prevent the positioning strips 4 from affecting the operation of the braiding machine.
[0039] In this embodiment, each of the hooks 21 contains a plurality of positioning strips 4.
[0040] Preferably, the number of positioning strips 4 accommodated in each hook 21 is equal. In this embodiment, two positioning strips 4 are held in each hook 21. If only one positioning strip 4 is accommodated in each hook 21, then when the number of positioning strips 4 is large, more hooks 21 need to be set, which makes it difficult to set enough hooks 21 in the limited space of the outer wall of the retaining ring 2.
[0041] In this embodiment, one end of the mandrel 1 is the head end 5, the radius of the head end 5 is larger than that of the mandrel 1, the connection between the head end 5 and the mandrel 1 is provided with a first inclined surface 6, the retaining ring 2 is provided on the head end 5, the positioning hole 3 is provided on the first inclined surface 6, the end of the mandrel 1 away from the head end 5 is provided with a ring post 7, and the end of the ring post 7 facing the head end 5 is provided with a second inclined surface 8.
[0042] Specifically, the head end 5 of the core rod 1 is integrally formed with the core rod 1 and is coaxial with the core rod 1. The radius of the head end 5 is larger than that of the core rod 1, so that a first inclined surface 6 can be formed at the intersection of the head end 5 and the core rod 1. The retaining ring 2 is located above the first inclined surface 6, so that when the hook 21 on the retaining ring 2 hooks the positioning strip 4, the positioning strip 4 will extend in the direction away from the second inclined surface 8 and towards the first inclined surface 6, thereby preventing the positioning strip 4 from extending to the position between the first inclined surface 6 and the second inclined surface 8 and affecting the weaving and forming of the dense mesh support. The positioning hole 3 is located on the first inclined surface 6. Since the weaving direction of the dense mesh stent starts from the position of the positioning hole 3, the starting end of the dense mesh stent can have a trumpet shape due to the presence of the first inclined surface 6. Similarly, the annular post 7 is the ending end of the dense mesh stent during weaving. When the dense mesh stent is woven to the position of the annular post 7, it will also form a trumpet shape at the ending end of the dense mesh stent due to the presence of the second inclined surface 8. Thus, both ends of the dense mesh stent are trumpet-shaped, thereby increasing the anchoring force of the dense mesh stent in the blood vessel.
[0043] In this embodiment, the positioning holes 3 are preferably set as a first group of holes 31 and a second group of holes 32. The first group of holes 31 and the second group of holes 32 are arranged alternately along the circumference of the core rod 1, and the first group of holes 31 is located on the side of the second group of holes 32 away from the annular column 7, so that the first group of holes 31 and the second group of holes 32 form a "staggered" form on the first inclined surface 6. Thus, the arrangement of the positioning strips 4 installed in the positioning holes 3 is the same as the arrangement of the first group of holes 31 and the second group of holes 32. This makes the starting end of the braided wire hanging on the positioning strips 4 form a closed structure with different heights. This structure will ensure that when the starting end of the dense mesh support is pushed out of the guide tube and opened, the closed structures with different heights will not interfere with each other, which helps the dense mesh support to open normally and fit properly against the wall.
[0044] The retaining ring 2 includes an installation part 22 and a retaining part 23. The installation part 22 has a first installation hole 24, and the retaining hook 21 is circumferentially disposed on the retaining part 23.
[0045] Specifically, the retaining ring 2 has a hollow and through-type cylindrical structure. The inner diameter of the retaining ring 2 is slightly larger than the outer diameter of the head end 5, allowing the retaining ring 2 to be coaxially fitted onto the head end 5. The outer diameter of the mounting part 22 is smaller than the outer diameter of the locking part 23. The mounting part 22 and the locking part 23 are coaxially arranged, and the locking part 23 is located on the side of the mounting part 22 near the first inclined surface 6. A first mounting hole 24 is formed on the mounting part 22. The first mounting hole 24 is used for fasteners such as bolts to pass through, and the retaining ring 2 is fixed to the head end 5 by the fasteners. The retaining ring 2 is designed to be detachably mounted on the head end 5. When the arrangement of the positioning strips 4 changes, different retaining rings 2 can be replaced so that the hooks 21 on the retaining ring 2 can be adapted to the positioning strips 4.
[0046] In this embodiment, the ring post 7 is movably sleeved on the mandrel 1, and the ring post 7 is provided with a second mounting hole 71.
[0047] The second mounting hole 71 is used to insert a fastener, which can fix the ring post 7 to the mandrel 1. When the weaving of the mesh support is completed, the fastener in the second mounting hole 71 is removed, so that the ring post 7 can be removed from the mandrel 1, and the woven mesh support can be easily removed from the end of the mandrel 1 where the ring post 7 is installed.
[0048] In this embodiment, the core rod 1 is hollow inside. The hollow design of the core rod 1 reduces its weight, facilitates movement, and makes it easier for technicians to install the core rod 1 on the knitting machine. Both the head end 5 and the end of the core rod 1 away from the head end 5 are provided with through hanging holes 9 for easy hanging of the core rod 1.
[0049] In this embodiment, the distance between the retaining ring 2 and the first inclined surface 6 is 15mm.
[0050] Specifically, the distance between the bottom surface of the retaining ring 2 and the top surface of the first inclined surface 6 is 15mm. If the distance between the retaining ring 2 and the first inclined surface 6 is too large, the positioning strip 4 will not be easily hooked into the hook 21. If the distance between the retaining ring 2 and the first inclined surface 6 is too small, when the positioning strip 4 is hooked into the hook 21, the end of the positioning strip 4 away from the positioning hole 3 will easily deform in the direction away from the core rod 1, which will also affect the weaving operation of the braiding machine.
[0051] Example 2
[0052] Reference Figure 2 This is Embodiment 2 of a dense mesh support weaving fixture of the present invention. The difference between this embodiment and Embodiment 1 is that the ring column 7 includes a contraction section 72 and an expansion section 73; the contraction section 72 is located on the side of the expansion section 73 near the first inclined surface 6; the second inclined surface 8 is located on the side of the contraction section 72 near the first inclined surface 6; the diameter of the expansion section 73 is larger than that of the contraction section 72. The distance between the retaining ring 2 and the first inclined surface 6 is 20mm.
[0053] Specifically, the ring post 7 is hollow and through-hole, with its inner diameter slightly larger than the outer diameter of the mandrel 1, allowing it to be movably fitted onto the mandrel 1. A second mounting hole 71 is formed through the expansion section 73 of the ring post 7. The expansion section 73 is designed to provide sufficient depth for the second mounting hole 71, allowing bolts to be inserted to secure the ring post 7 to the mandrel 1. The contraction section 72 is provided to minimize the overall volume of the ring post 7 for ease of weaving.
[0054] Example 3
[0055] This embodiment describes a method for weaving a dense mesh support using the dense mesh support weaving fixture in Embodiment 2 of the present invention, including the following steps:
[0056] S1. Insert the positioning strip 4 into the positioning hole 3;
[0057] S2. Hang the braided yarn on the positioning strip 4, and then hook the positioning strip 4 into the hook 21. Each hook 21 contains two positioning strips 4.
[0058] S3. Install the mesh support weaving fixture on the weaving machine to start weaving. During weaving, the weaving wires are woven into shape on the core rod 1 along the direction from the first inclined surface 6 to the second inclined surface 8.
[0059] S4. When the braiding yarn is woven on the mandrel 1 to the position of the second inclined surface 8, the weaving is completed, and a complete dense mesh support is generated on the mandrel 1. After the weaving is completed, the ring post 7 is removed from the mandrel 1, and the positioning strip 4 is removed from the positioning hole 3. The dense mesh support can then be removed from the end of the mandrel 1 away from the head end 5.
[0060] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.
Claims
1. A weaving fixture for a dense mesh support, characterized in that, It includes a core rod (1) and a retaining ring (2); the retaining ring (2) is located at one end of the core rod (1); the core rod (1) has a plurality of positioning holes (3) in the circumferential direction, and a positioning strip (4) is inserted into the positioning hole (3); the retaining ring (2) has a plurality of hooks (21) in the circumferential direction for accommodating and holding the positioning strip (4).
2. The mesh support weaving fixture according to claim 1, characterized in that, Each of the hooks (21) contains one or more positioning strips (4).
3. The mesh support weaving fixture according to claim 1, characterized in that, One end of the mandrel (1) is the head end (5), the radius of the head end (5) is larger than that of the mandrel (1), the connection between the head end (5) and the mandrel (1) is provided with a first inclined surface (6), the retaining ring (2) is provided on the head end (5); the positioning hole (3) is provided on the first inclined surface (6); the end of the mandrel (1) away from the head end (5) is provided with a ring post (7), and the end of the ring post (7) facing the head end (5) is provided with a second inclined surface (8).
4. The mesh support weaving fixture according to claim 3, characterized in that, The positioning hole (3) includes a first group of holes (31) and a second group of holes (32). The first group of holes (31) and the second group of holes (32) are arranged alternately along the circumference of the mandrel (1), and the first group of holes (31) is located on the side of the second group of holes (32) away from the ring column (7).
5. The mesh support weaving fixture according to claim 1, characterized in that, The retaining ring (2) includes an installation part (22) and a retaining part (23). The installation part (22) has a first installation hole (24), and the retaining hook (21) is circumferentially disposed on the retaining part (23).
6. The mesh support weaving fixture according to claim 3, characterized in that, The ring post (7) is movably sleeved on the mandrel (1), and the ring post (7) is provided with a second mounting hole (71).
7. The mesh support weaving fixture according to claim 6, characterized in that, The ring column (7) includes a contraction section (72) and an expansion section (73); the contraction section (72) is located on the side of the expansion section (73) near the first inclined surface (6); the second inclined surface (8) is located on the side of the contraction section (72) near the first inclined surface (6); the diameter of the expansion section (73) is larger than that of the contraction section (72).
8. The mesh support weaving fixture according to claim 1, characterized in that, The core rod (1) is hollow inside.
9. The mesh support weaving fixture according to claim 3, characterized in that, The distance between the retaining ring (2) and the first inclined surface (6) is 15~20mm.
10. A method for weaving a dense mesh support using the dense mesh support weaving fixture as described in any one of claims 3-9, characterized in that, Includes the following steps: S1. Insert the positioning strip (4) into the positioning hole (3); S2. Hang the braided wire on the positioning strip (4), and then hook the positioning strip (4) into the hook (21). Each hook (21) contains several positioning strips (4). S3. Install the mesh support weaving fixture on the weaving machine and start weaving. During weaving, the weaving wires are woven into shape on the core rod (1) along the direction from the head end (5) to the ring post (7). S4. When the braiding wire is woven on the mandrel (1) to the position of the second inclined surface (8), the weaving is completed, and a complete dense mesh support is generated on the mandrel (1). After the weaving is completed, the ring post (7) is removed from the mandrel (1), and the positioning strip (4) is removed from the positioning hole (3). The dense mesh support can then be removed from the end of the mandrel (1) away from the head end (5).