Stent for the intestinal tract and method of weaving the same

Abstract

The present application relates to a kind of stents for intestine and its weaving method, the weaving process of head section and tail section both include the movement of first wire between the adjacent two rows of positioning pins with first V-shaped bending, until the positioning pin of first or third layer area is half full or full, in the case where the positioning pin of first or third layer area is half full, the second wire is wound around the first or third layer area, the weaving process of main body includes the movement of first wire between the adjacent two rows of positioning pins in the last row of first layer area, the first row of second, third layer area with second V-shaped bending, until the positioning pin of the last row of first layer area, the first row of second, third layer area is all full;Interwoven wire between every two rows provides radial support, the structure of wire interlock on each row of positioning pins improves the shortening of stent, flexibility, overall meet the required performance of intestinal stent.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a method for weaving a stent for the intestine. Background Technology

[0002] The most common braided brackets on the market are of two types: Cross type and Hook type.

[0003] Cross-type stents are made by spirally winding filaments along the circumference of a mold. When the filaments reach the top of the stent, they bend in the opposite direction at a certain angle. The filaments do not bend in the opposite direction in the area between the two ends of the stent. The advantages of cross-type stents are good radial support, but they have a large shrinkage rate (the length of the stent decreases significantly after it is released from the sheath and expands) and poor flexibility (the greater the external force required to bend the stent, the worse its flexibility, and it cannot adapt to different degrees of curvature in the intestine).

[0004] Hook-type stents are constructed by repeatedly bending the stent from one end to the other, connecting them together in a "V" shape. The disadvantage of Hook-type stents is poor radial support, but their advantages are low shrinkage rate (the length of the stent does not decrease significantly after it is released from the sheath) and good flexibility (the less force required to bend the stent, the better its flexibility, to adapt to different degrees of curvature in the intestine).

[0005] Regarding stent performance, insufficient radial support will affect the stent's support effect, and the stent will not be able to provide effective support force; a large shortening ratio is prone to causing severe deformation and displacement of the stent under intestinal peristalsis, thereby causing stent failure and bringing a series of complications; a stent with insufficient flexibility cannot adapt to the intestinal environment with different degrees of curvature, which can easily lead to damage to the intestinal wall.

[0006] Therefore, developing a scaffold with good radial support, low shortening rate, and good flexibility is a current research problem. Summary of the Invention

[0007] Therefore, it is necessary to provide a scaffold for the intestine with good radial support, low shortening rate and good flexibility, and a method for weaving the scaffold thereof, in order to address the above-mentioned technical problems.

[0008] A method for weaving a stent for the intestine, the method employing a cylindrical clamp, wherein the cylindrical clamp is sequentially arranged with a first layer region, a second layer region, and a third layer region along the axial direction; the first layer region and the third layer region each include at least two rows of positioning pins, and the second layer region includes at least one row of positioning pins; each row of positioning pins in the first layer region, the second layer region, and the third layer region includes at least four positioning pins evenly distributed along the circumference of the cylindrical clamp; the stent for the intestine includes a head segment, a body segment, and a tail segment connected sequentially, and the weaving method includes the following steps:

[0009] The first section weaving process includes: moving the first wire in a first V-shape between two adjacent rows of locating pins in the first layer area until the locating pins in the first layer area are completely or half-wound; and, when the locating pins in the first layer area are half-wound by the first wire, winding the second wire around the remaining locating pins in the first layer area.

[0010] The main weaving process includes: moving the first wire in a second V-shape between adjacent rows of positioning pins in the last row of the first layer area, the second layer area, and the first row of the third layer area, until all the positioning pins in the last row of the first layer area, the second layer area, and the first row of the third layer area are completely wrapped.

[0011] The tail section weaving process includes: the movement of the first wire is the same as that in the head section weaving process, the first wire makes the positioning pins of the third layer area completely or half-wound; when the positioning pins of the third layer area are half-wound by the first wire, the second wire makes the remaining positioning pins of the third layer area completely wound.

[0012] Specifically, when the first or second wire is braided around the adjacent A-row and B-row positioning pins, and returns to the A-row positioning pin, it wraps around the braided path between the A-row and B-row positioning pins and moves to the B-row positioning pin to form a reinforcing rib. Then, it begins to move between the adjacent B-row and C-row positioning pins.

[0013] If there are two opposing V-shapes at the same locating pin, the first or second wire of the two opposing V-shapes are interlocked.

[0014] In one embodiment, with at least half of the locating pins in the first layer region and the third layer region fully wound, winding the second wire to fully wrap the remaining locating pins in the first layer region and the remaining locating pins in the third layer region includes the following steps:

[0015] The second wire moves in the first layer region from any locating pin that the first wire has not passed through, bending in the first V-shape between two adjacent rows of locating pins, until all the locating pins in the first layer region are completely wrapped around it.

[0016] The second wire moves in the third layer region from any locating pin that the first wire has not passed through, bending in the first V-shape between two adjacent rows of locating pins, until all the locating pins in the third layer region are completely wrapped around it.

[0017] In one embodiment, as the second wire moves between each pair of adjacent rows of locating pins, the second wire interweaves and passes over the braided path of the first wire.

[0018] In one embodiment, when the first wire has wrapped more than or equal to 3 times between each pair of adjacent locating pins, starting from the third loop of weaving, the first wire interweaves and passes between the previous loop or the previous two loops of woven path.

[0019] In one embodiment, the weaving method further includes forming another reinforcing rib parallel to the reinforcing rib on the second wire, as follows:

[0020] The second wire is wound around the braided path of the first wire between the rows of positioning pins, starting from any of the locating pins that the reinforcing rib has not passed, in a direction parallel to the reinforcing rib, to form the other reinforcing rib.

[0021] In one embodiment, the reinforcing rib and the other reinforcing rib are arranged symmetrically with respect to the axis of the bracket.

[0022] In one embodiment, when the positioning pins in the first and third layer regions are completely wrapped, at least one third wire is also included, which is braided in the same way as the second wire to form a reinforcing rib, and the plurality of reinforcing ribs are evenly distributed circumferentially.

[0023] In one embodiment, the number of positioning pins in each row of positioning pins in the first layer region and the number of positioning pins in each row of positioning pins in the third layer region are the same and adjacent rows are aligned with each other.

[0024] The first V-shape spans (2m+1) locating pins in the same row, where m is an integer greater than 1;

[0025] The last row of positioning pins in the first layer area, each row of positioning pins in the second layer area, and the first row of positioning pins in the third layer area have the same number of positioning pins, and adjacent rows are staggered.

[0026] The second V-shape spans 2m' locating pins in the same row, where m' is an integer greater than 1.

[0027] In one embodiment, m ≥ m'.

[0028] In one embodiment, m and m' are each independently 2 or 3.

[0029] In one embodiment, the number of positioning pins in each row of positioning pins in the first layer region, the second layer region, and the third layer region is the same and the adjacent rows are staggered.

[0030] The first V-shape spans 2n locating pins located in the same row, where n is an integer greater than 1;

[0031] The second V-shape spans 2n' locating pins in the same row, where n' is an integer greater than 1.

[0032] In one embodiment, n>n'.

[0033] In one embodiment, n and n' are each independently 2 or 3.

[0034] A stent for the intestine, the stent for the intestine being woven using the weaving method described in any of the preceding claims.

[0035] The above-described method for weaving scaffolds for the intestine has at least the following advantages:

[0036] The braiding process of both the head and tail sections involves moving the first wire in a first V-shape between adjacent rows of locating pins until the locating pins in the first or third layer are fully or half-wound. Once the locating pins in the first or third layer are half-wound, the second wire is then fully wound around the first or third layer. The main body braiding process involves moving the first wire in a second V-shape between adjacent rows of locating pins in the last row of the first layer, the second layer, and the first row of the third layer until all the locating pins in the last row of the first layer, the second layer, and the first row of the third layer are fully wound. Therefore, the interlaced wires between each pair of rows provide radial support, and the interlocking structure of the wires on each row of locating pins improves the stent's shortening and flexibility, thus meeting the overall performance requirements of the intestinal stent. Furthermore, using two wires to complete the stent braiding and controlling the braiding path simplifies the stent manufacturing process and increases production efficiency. Attached Figure Description

[0037] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figures 1 to 13 This is a flowchart illustrating the method for weaving a scaffold for the intestine in the first embodiment;

[0040] Figures 14 to 23 This is a flowchart illustrating the method for weaving a scaffold for the intestine in the second embodiment;

[0041] Figure 24 In one embodiment, the same positioning pin has two opposing V-shapes, and the two opposing V-shapes of the first wire or the second wire are interlocked.

[0042] Figure 25 and Figure 26 An enlarged view of the winding method for the reinforcing ribs. Detailed Implementation

[0043] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0044] One embodiment of the method for weaving a stent for the intestine uses a cylindrical clamp. The cylindrical clamp is arranged in a first layer region, a second layer region, and a third layer region along the axial direction. Each of the first layer region, the second layer region, and the third layer region is fixedly or detachably provided with a number of positioning pins.

[0045] Specifically, the first layer region has two or more rows of locating pins, each row of which has at least four locating pins evenly distributed along the circumference of the cylindrical fixture, and the rows of locating pins in the first layer region are aligned with each other. The second layer region has one or more rows of locating pins, the number of locating pins in each row of the second layer region is the same as the number of locating pins in each row of the first layer region, and adjacent rows of locating pins in the second layer region are staggered. For example, the second layer region has two rows of locating pins, and the two rows are staggered. Alternatively, the second layer region has three or more rows of locating pins, adjacent rows are staggered, and the upper and lower adjacent rows of locating pins in each row are aligned with each other. The third layer region has two or more rows of locating pins, the number of locating pins in each row of the third layer region is the same as the number of locating pins in each row of the first layer region, and the rows of locating pins in the third layer region are aligned with each other. The rows of locating pins in the third layer region are also aligned with the rows of locating pins in the first layer region.

[0046] Alternatively, the first layer region has two or more rows of locating pins, each row in the first layer region has at least four locating pins evenly distributed along the circumference of the cylindrical fixture, adjacent rows of locating pins in the first layer region are staggered, and the upper and lower adjacent rows of locating pins in each row are aligned. The second layer region has one or more rows of locating pins, the number of locating pins in each row of the second layer region is the same as the number of locating pins in each row of the first layer region, and adjacent rows of locating pins in the second layer region are staggered. For example, the second layer region has two rows of locating pins, and the two rows are staggered. Or, the second layer region has three or more rows of locating pins, adjacent rows are staggered, and the upper and lower adjacent rows of locating pins in each row are aligned. The number of rows of positioning pins in the third layer area is greater than or equal to 2. The number of positioning pins in each row of the third layer area is the same as the number of positioning pins in each row of the first layer area. In addition, the two adjacent rows of positioning pins in each row of the third layer area are staggered, and the two rows of positioning pins on opposite sides of each row are aligned with each other.

[0047] The intestinal scaffold comprises a head segment, a body segment, and a tail segment connected sequentially. Its weaving method includes the following steps:

[0048] The initial weaving process includes: moving the first wire in a first V-shape between adjacent rows of locating pins in the first layer area until each row of locating pins in the first layer area is completely or half-wound; after the first wire has wrapped half of the locating pins in the first layer area, the second wire is wound around the remaining locating pins in the first layer area. When the first wire has wound more than or equal to 3 turns between each pair of adjacent rows of locating pins, starting from the third turn, the first wire interweaves vertically between the already woven paths of the previous turn or the previous two turns. Specifically, the spatial distribution of the vertical interweaving must follow the principle of uniformity and symmetry. This interweaving ensures a uniform and tight braided structure of the support, preventing obvious gaps, springbacks, or shifts after shaping.

[0049] Specifically, when the first wire has wrapped around half of the locating pins in each row of the first layer area, the process of wrapping the second wire around the remaining locating pins in the first layer area includes the following steps:

[0050] The second wire moves in the first layer region, starting from any locating pin that the first wire has not passed through, and bends in the first V-shape between adjacent rows of locating pins until all the locating pins in the first layer region are completely wrapped around it. As the second wire moves between each adjacent row of locating pins, it interweaves and passes through the already braided path of the first wire. This interweaving ensures a uniform and tight braided structure of the support, preventing noticeable gaps, springback, or shifting after shaping.

[0051] The main weaving process includes: moving the first wire in a second V-shape between adjacent rows of positioning pins in the last row of the first layer area, the second layer area, and the first row of the third layer area, until all the positioning pins in the last row of the first layer area, the second layer area, and the first row of the third layer area are completely wrapped.

[0052] The tail section weaving process includes: the movement of the first wire is the same as in the head section weaving process, where the first wire completely or partially winds around the positioning pins in each row of the third layer area; after the positioning pins in the third layer area are partially windn by the first wire, the second wire winds around the remaining positioning pins in the third layer area. When the first wire has wound more than or equal to 3 turns between each pair of adjacent rows of positioning pins, starting from the third turn, the first wire interweaves vertically between the already woven paths of the previous turn or the previous two turns. Specifically, the spatial distribution of the vertical interweaving must follow the principle of uniformity and symmetry. This interweaving ensures a uniform and tight braided structure of the support frame, preventing obvious gaps, springbacks, or shifts after shaping.

[0053] With the first wire wrapping halfway around the locating pins in each row of the third layer area, the remaining locating pins that allow the second wire to wrap around the third layer area specifically include:

[0054] The second wire moves in the third layer region, starting from any locating pin that the first wire has not passed through, bending in the first V-shape between adjacent rows of locating pins until all locating pins in the third layer region are completely wrapped around it. As the second wire moves between each pair of adjacent rows of locating pins, it interweaves vertically through the braided paths of the first wire. Specifically, the spatial distribution of this vertical interweaving must follow a uniform and symmetrical principle. This interweaving ensures a uniform and tight braided structure of the support, preventing noticeable gaps, springbacks, or shifts after shaping.

[0055] In this process, once the first or second wire is fully braided onto the adjacent A-row and B-row locating pins (fully braided specifically means completely or partially wound), and returns to the A-row locating pins, it wraps around the braided path between the A-row and B-row locating pins and moves to the B-row locating pin to form a reinforcing rib. Then, it begins to move between the adjacent B-row and C-row locating pins. Here, A, B, and C represent any three adjacent rows of locating pins. If there are two opposing V-shapes at the same locating pin, the first or second wires in the two opposing V-shapes interlock.

[0056] For example, in one weaving method, the number of rows in the first and third layers is greater than or equal to 2. The number of positioning pins in each row of the first layer and each row of the third layer is the same, and adjacent rows are aligned. The first V-shape spans (2m+1) positioning pins in the same row, where m is an integer greater than 1. That is, the first V-shape spans an odd number of positioning pins. The number of positioning pins in each row is greater than 3, and the number of positioning pins in each row is not a multiple of m. The number of positioning pins in the last row of the first layer, each row of the second layer, and the first row of the third layer is the same, and adjacent rows are staggered. The second V-shape spans 2m' positioning pins in the same row, where m' is an integer greater than 1. Furthermore, the number of positioning pins in each row is ≠ k(2m'-1), where k is a positive integer. For example, m ≥ m'. More specifically, m and m' are each independently 2 or 3, ensuring both the performance of the intestinal stent and high production efficiency. When the number of locating pins in each row is odd, the first V-shape is wound 2m times to fill all the locating pins. When the number of locating pins in each row is even, the first V-shape is wound m times to fill half of the locating pins. The range of m is 2 to 30.

[0057] In another weaving method, the number of rows in the first and third layers is greater than or equal to 2. The number of positioning pins in each row of the first, second, and third layers is the same, and adjacent rows are staggered. The first V-shape spans 2n positioning pins in the same row, where n is an integer greater than 1. That is, the first V-shape can only span an even number of positioning pins. The second V-shape spans 2n' positioning pins in the same row, where n' is an integer greater than 1. For example, n > n'. More specifically, n and n' are each independently 2 or 3, ensuring both the performance of the intestinal stent and high production efficiency. The number of positioning pins in each row is >3, and the number of positioning pins in each row ≠ k(2n-1) and ≠ k(2n'-1). The first V-shape wraps around all positioning pins after 2n-1 turns.

[0058] Using the aforementioned stent weaving method, the weaving process of both the head and tail sections involves moving the first wire in a first V-shape between adjacent rows of positioning pins until the positioning pins in the first or third layer are fully or half-wound. Once the positioning pins in the first or third layer are half-wound, the second wire is then fully wound around the first or third layer. The main body weaving process involves moving the first wire in a second V-shape between adjacent rows of positioning pins in the last row of the first layer, the second layer, and the first row of the third layer, until all positioning pins in the last row of the first layer, the second layer, and the first row of the third layer are fully wound. Therefore, the interlaced wires between each pair of rows provide radial support, and the interlocking structure of the wires on each row of positioning pins improves the stent's shortening and flexibility, thus meeting the overall performance requirements of the intestinal stent. Furthermore, using two wires to complete the stent weaving and controlling the weaving path simplifies the stent manufacturing process and increases production efficiency.

[0059] The weaving method also includes forming another reinforcing rib parallel to the first reinforcing rib using the second wire, as follows:

[0060] The second wire, starting from any locating pin that the reinforcing rib has not passed, is wound along the braided path of the first wire between the rows of locating pins in a direction parallel to the reinforcing rib to form the other reinforcing rib. The reinforcing rib provides axial reinforcement to the bracket, reducing its axial shortening. Specifically, the reinforcing rib and the other reinforcing rib are symmetrically arranged with respect to the bracket's axis. This makes the overall structure of the bracket more stable.

[0061] The weaving method also includes forming at least one additional reinforcing rib parallel to the reinforcing rib with at least one third wire, specifically including the following steps:

[0062] With the locating pins in the first and third layer areas completely wound, at least one third wire is also included. The third wire is braided in the same way as the second wire to form a reinforcing rib, and multiple reinforcing ribs are evenly distributed circumferentially. For example, the number of third wires can be one, two, or more. These reinforcing ribs, together with the first and second wires, form a circumferentially distributed reinforcing rib, making the overall structure of the support more stable.

[0063] The following describes the weaving method of the intestinal scaffold of this application in detail with two specific embodiments.

[0064] Please see Figures 1 to 13 This is a flowchart illustrating the method for weaving a scaffold for the intestine in the first embodiment. Figures 1 to 13 The diagram shows a cylindrical clamp in its unfolded state. The dots in the diagram represent locating pins. Figures 1 to 13 In the middle, the first layer area has two rows of locating pins, namely... Figures 1 to 13 The columns 01 and 02 are arranged vertically; each column has 14 locating pins, respectively. Figures 1 to 13 The 14 locating pins, numbered 01 to 14, are evenly distributed along the circumference of the cylindrical fixture, with the two rows of locating pins in the first layer area aligned with each other.

[0065] The second layer area has 11 rows of locating pins, namely... Figures 1 to 13 The first layer consists of 13 rows arranged longitudinally; each row has 14 locating pins, evenly distributed around the circumference of the cylindrical fixture. In the second layer, the 11 rows of locating pins are staggered, with the adjacent rows aligned vertically. Specifically, the odd-numbered rows of locating pins in the second layer are aligned, and the even-numbered rows are aligned, but the odd and even rows are staggered.

[0066] The third layer area has two rows of locating pins, namely... Figures 1 to 13 The cylindrical fixture has 14 and 15 rows arranged longitudinally, with 14 locating pins in each row. These 14 locating pins are evenly distributed along the circumference of the cylindrical fixture. The two rows of locating pins in the third layer are aligned with each other. The two rows of locating pins in the third layer are also aligned with the two rows of locating pins in the first layer.

[0067] The locating pins in the first layer are evenly spaced, and similarly, the locating pins in the third layer are evenly spaced, as are the locating pins in the second layer. However, the spacing between the locating pins in the second layer may not be the same as that in the first and third layers. Alternatively, the spacing between the locating pins in the second layer may be the same as that in the first and third layers.

[0068] First wire weaving

[0069] Please see Figure 1 So that the first wire starts from the first starting point ( Figure 1 Starting from the position corresponding to the number 0 in the weaving path marked with an arrow, weave away from the second layer area, moving in a large V-shape (i.e., the first V-shape mentioned above) between adjacent rows of positioning pins in the first layer area, until it reaches... Figure 1 The first position in ( Figure 1 (The position corresponding to number 1 in the weaving path with arrows) completes the first loop of the first layer area. The first starting point is any one of the second row of locating pins in the first layer area. In the first embodiment, the large V-shape spans 7 locating pins located in the same row.

[0070] Please see Figure 2 This causes the first wire to continue moving in a large V-shape from position 1, until it reaches... Figure 2 The second position in Figure 2 (The position corresponding to the number 2 in the weaving path with arrows) completes the second round of weaving in the first layer area. Continue moving the first thread from position 2 in a large V-shape until it reaches... Figure 2 The 3rd position in Figure 2 The position corresponding to number 3 in the arrow-shaped weaving path (at this point, the first wire returns to the first starting point) completes the third loop of weaving in the first layer area, ensuring that the positioning pins of the first layer area are half-wound. During the third loop of weaving, the first wire interweaves between the wires of the first and second loops, both vertically and horizontally. This interweaving ensures that the braided wire structure of the support is uniform and tight, preventing obvious gaps, springbacks, or shifts after shaping.

[0071] Please see Figure 3 The first wire begins weaving from the first starting point towards the direction closer to the third layer area, bending and moving in a small V-shape (i.e., the aforementioned second V-shape) between the last row of the first layer area and the first row of the positioning pins of the second layer area, until it reaches... Figure 3 The 4th position in Figure 3 (The position corresponding to number 4 in the arrow-shaped weaving path) completes the first round of weaving between the last row of the first layer area and the first row of the second layer area's locating pins. Small V-shapes span four locating pins located in the same row. After completing the first round of weaving, some locating pins 300 have two opposing V-shapes 400, and the first wires of the two opposing V-shapes 400 interlock (e.g., ...). Figure 24 (As shown).

[0072] Please see Figure 4The first wire moves from position 4 in a small V-shape, completing the second loop of weaving between the last row of the first layer area and the first row of the second layer area's positioning pins, reaching... Figure 3 The 5th position in Figure 4 (The position corresponding to number 5 in the weaving path with arrows) Continue moving to complete the third loop of weaving between the last row of the first layer area and the first row of the second layer area's positioning pins, reaching... Figure 3 The 6th position in Figure 4 The position corresponding to number 6 in the weaving path with arrows indicates that the first wire returns to the first starting point, causing the first wire to wrap around the last row of the first layer area and the first row of the second layer area's positioning pins. After completing the second and third rounds of weaving, the last row of the first layer area has two opposing V-shapes 400 at the additional positioning pins 300, and the first wires of the two opposing V-shapes 400 interlock (e.g., ...). Figure 24 (As shown).

[0073] Please see Figure 5 Starting from the first starting point and moving towards the third layer region, the first wire is wound around the braided first wire from the last row of locating pins in the first layer region to the first row of locating pins in the second layer region to form a reinforcing rib. Specifically, the first wire is wound around the braided first wire from position 6 along the second row of locating pins in the first layer region to form a reinforcing rib. The reinforcing rib 100 can be exemplarily referenced from... Figure 25 and 26 However, not limited to the manner shown in the figure, the reinforcing rib 100 is spirally wound around the first wire 200 that has been braided in the aforementioned steps to form the reinforcing rib 100. For example... Figure 25 As shown, the reinforcing rib 100 is wrapped around two opposing V-shaped sections at the same locating pin, as... Figure 26 As shown, the reinforcing rib is wrapped around the intersection of the first wire 200 (e.g. Figure 5 (The small V-shaped intersection between the last row of locating pins in the first layer area and the first row of locating pins in the second layer area). Reinforcing ribs can axially strengthen the support, thereby reducing the axial shortening of the support.

[0074] Please continue reading. Figure 5 and Figure 6 Repeat the positioning pins in each row of the second layer area Figure 4 and Figure 5 The steps are repeated until all the locating pins in the last row of the second layer area and the first row of the third layer area are completely wrapped. That is, starting from the starting point of the second layer area, move in a small V-shape to... Figure 5 Position 7 in the middle, until the first wire moves to position 41, at which point the last row of the second layer area and the first row of the third layer area are completely wrapped with positioning pins.

[0075] Please see Figure 7 and Figure 8 The first wire is wound around the braided path between the last row of locating pins in the second layer area and the first row of locating pins in the third layer area, and moves to the second starting point of the first row of locating pins in the third layer area to form a reinforcing rib 100 (the structure of the reinforcing rib 100 can be referenced). Figure 25 and 26 Then, the first wire is started to be woven from the second starting point of the first row of the third layer area away from the second layer area, in the same way as the first layer area. It moves in a large V-shape between the positioning pins of the two adjacent rows of the third layer area until the 45th position (i.e. the second starting point of the first row of the third layer area), so that the positioning pins of the third layer area are wrapped halfway.

[0076] The second wire braid

[0077] Please see Figure 9 and Figure 10 The second wire is positioned relative to the first starting point of the first wire. Figure 9 The weaving begins at the position corresponding to S0 (the relative position of the first starting point refers to the position that is symmetrical to the axis of the first starting point and located in the same row). In this embodiment, the weaving path of the second wire contains S0, S1, to S8, which is the same as the steps of weaving the first layer area of ​​the first wire. The second wire moves in a large V-shape between the two adjacent rows of positioning pins in the first layer area, weaving the first circle to the S1 position, the second circle to the S2 position, and the third circle to the S3 position, until the second wire returns to the relative position (S0) of the first starting point of the first wire, so that all the positioning pins in the first layer area are fully wrapped.

[0078] Please see Figure 11 Starting from the first starting point relative to the first wire (position S0), the second wire is wound along a path parallel to the reinforcing rib towards the third layer area, between the braided paths of the rows of positioning pins in the second layer area, until the second wire reaches the third starting point (position S8) of the first row in the third layer area (the winding method of the reinforcing rib can be referred to...). Figure 25 and 26 ).

[0079] Please see Figure 12 and Figure 13The second wire begins weaving from the third starting point (S8 position) of the first row in the third layer area, moving away from the second layer area. The steps are the same as for the first wire weaving the first layer area. It moves in a large V-shape between adjacent rows of locating pins in the third layer area, weaving the first loop to position S5, the second loop to position S6, and the third loop to position S7, until the second wire returns to the third starting point S8 of the first row in the third layer area, ensuring all locating pins in the third layer area are fully wound. During the braiding process, if there are two opposing V-shapes 400 at the same locating pin, the first or second wire of the two opposing V-shapes 400 interlock (please refer to...). Figure 24 ).

[0080] Please see Figures 14 to 23 This is a flowchart illustrating the method for weaving a scaffold for the intestine in the second embodiment. Wherein, Figures 14 to 23 The diagram shows a cylindrical clamp in its unfolded state. The dots in the diagram represent locating pins. Figures 14 to 23 In the middle, the first layer area has two rows of locating pins, namely... Figures 14 to 23 The columns 01 and 02 are arranged vertically, with 14 locating pins in each column. Figures 14 to 23 The 14 locating pins, numbered 01 to 14, are evenly distributed along the circumference of the cylindrical fixture, with the two rows of locating pins in the first layer area being staggered.

[0081] The second layer area has 11 rows of locating pins, namely... Figures 14 to 23 The first three rows (03 to 13) are arranged longitudinally, with 14 locating pins in each row. These 14 pins are evenly distributed around the circumference of the cylindrical fixture. In the second layer of 11 rows of locating pins, adjacent rows are staggered, and adjacent rows within each row are aligned. That is, odd-numbered rows of locating pins in the second layer are aligned, and even-numbered rows are aligned, but the odd and even rows are staggered.

[0082] The third layer area has two rows of locating pins, namely... Figures 14 to 23 The cylindrical fixture has 14 and 15 rows arranged longitudinally, with 14 locating pins in each row. These 14 pins are evenly distributed along the circumference of the fixture. The two rows of locating pins in the third layer are staggered. Specifically, the first row of locating pins in the first layer is aligned with the odd-numbered rows of locating pins in the second layer and the second row of locating pins in the third layer. Conversely, the second row of locating pins in the first layer is aligned with the even-numbered rows of locating pins in the second layer and the first row of locating pins in the third layer.

[0083] The locating pins in the first layer are evenly spaced, and similarly, the locating pins in the third layer are evenly spaced, as are the locating pins in the second layer. However, the spacing between the locating pins in the second layer may not be the same as that in the first and third layers. Alternatively, the spacing between the locating pins in the second layer may be the same as that in the first and third layers.

[0084] First wire weaving

[0085] Please see Figure 14 So that the first wire starts from the first starting point ( Figure 14 The weaving begins at position S0 (the location corresponding to the arrow-marked weaving path) in a direction away from the second layer area. It moves in a large V-shape (i.e., the first V-shape mentioned above) between adjacent rows of positioning pins in the first layer area, until it reaches... Figure 14 The first position in ( Figure 14 (The position corresponding to number 1 in the weaving path marked with an arrow) completes the first loop of the first layer area. The first starting point is any one of the second row of locating pins in the first layer area. In the first embodiment, the large V-shape spans 6 locating pins located in the same row.

[0086] Please see Figure 15 This causes the first wire to continue moving in a large V-shape (i.e., the aforementioned first V-shape) from position 1, until it reaches... Figure 15 At position 2, complete the second loop of the first layer area, and continue moving the first thread from position 2 in a large V-shape until it reaches... Figure 15 At position 3, complete the third loop of the first layer area, and continue moving the first thread from position 3 in a large V-shape until it reaches... Figure 15 At position 4, complete the fourth loop of the first layer area, and continue moving the first thread from position 4 in a large V-shape until it reaches... Figure 15 At position 5 (when the first wire returns to the first starting point), the fifth loop of the first layer is completed, ensuring all the positioning pins in the first layer are fully wound. From the third loop onwards, the first wire interweaves and passes between the previous or two loops' already woven paths. This interweaving ensures a uniform and tight braided structure, preventing noticeable gaps, springback, or shifting after shaping.

[0087] Please see Figure 16 The first wire begins weaving from the first starting point towards the third layer area, moving in a small V-shape between the last row of the first layer area and the first row of the second layer area's positioning pins, until it reaches... Figure 16 The 6th position in the middle. A small V-shape spans four locating pins located in the same row. When the first wire moves to... Figure 16After the 6th position, the last row of positioning pins in the first layer area has two opposing V-shapes 400, and the first wires of the two opposing V-shapes 400 are interlocked (e.g. Figure 24 (As shown).

[0088] Please see Figure 17 The first wire is moved from position 6 by repeatedly bending in a small V-shape (i.e., the second V-shape mentioned above) until it reaches position 8 (the first starting point), so that the first wire wraps around the last row of the first layer area and the first row of the second layer area's locating pins. The last row of the first layer area has two opposing V-shapes at additional locating pins, and the two opposing V-shapes of the first wire interlock.

[0089] Please see Figure 18 Starting from position 8 (the first starting point), the first wire is wound around the braided first wire in the preceding step, from the last row of locating pins in the first layer region to the first row of locating pins in the second layer region, forming a reinforcing rib. Specifically, the first wire is wound around the braided first wire in the preceding step from position 8 along the second row of locating pins in the first layer region, forming a reinforcing rib. This reinforcing rib provides axial reinforcement to the support, thereby reducing the axial shortening of the support. The reinforcing rib 100 can be referenced as follows: Figure 25 and 26 As shown, the reinforcing rib 100 is spirally wound around the first wire 200 that has been braided in the aforementioned steps to form a reinforcing rib. Figure 25 As shown, the reinforcing ribs are wrapped around two opposing V-shaped sections at the same locating pin, as... Figure 26 As shown, the reinforcing rib is wrapped around the intersection of the first wire (e.g. Figure 5 The small V-shaped intersection between the last row of locating pins in the first layer area and the first row of locating pins in the second layer area.

[0090] Please continue reading. Figure 18 and Figure 19 Repeat the positioning pins in each row of the second layer area Figure 17 and Figure 18 The steps are repeated until all the locating pins in the last row of the second layer area and the first row of the third layer area are completely wrapped. That is, starting from the starting point of the second layer area, move in a small V-shape to... Figure 18 Position 9 in the middle, until the first wire moves to position 43 (S1), at which point the last row of the second layer area and the first row of the third layer area are completely wrapped with positioning pins.

[0091] Please see Figure 20 and 21The first wire is wound around the braided path between the last row of locating pins in the second layer area and the first row of locating pins in the third layer area, and moves to the second starting point of the first row of locating pins in the third layer area to form a reinforcing rib. Then, the first wire starts to braid from the second starting point of the first row in the third layer area away from the second layer area, in the same way as the first layer area. It moves in a large V-shape between adjacent rows of locating pins in the third layer area until position 44. It moves in a large V-shape between adjacent rows of locating pins in the third layer area until positions 45-48. Finally, it returns to position 43 (i.e., the second starting point of the first row in the third layer area), so that all the locating pins in the third layer area are completely wrapped.

[0092] The second wire braid

[0093] Please see Figure 22 The second wire is positioned relative to the first starting point of the first wire. Figure 22 Starting from position S2 (the relative position of the first starting point refers to the position symmetrical to the axis of the first starting point and located in the same row), weave along the already woven path of the first wire between each row of positioning pins in a direction parallel to the reinforcing rib to form the other reinforcing rib, and finally fix it to the last row of the second layer area (position S3) (the winding method of the reinforcing rib can be referred to...). Figure 25 and 26 During the bracing process, if there are two opposing V-shapes 400 at the same positioning pin 300, then the first or second wire of the two opposing V-shapes 400 are interlocked (e.g., Figure 24 (As shown).

[0094] This application also provides a stent for the intestine, which is woven using the weaving method of the first or second embodiment described above.

[0095] 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.

[0096] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

[0097] In the description of this invention, 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 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, they should not be construed as limitations on this invention.

[0098] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0099] In this invention, unless otherwise explicitly 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 explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0100] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0101] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

Claims

1. A method for weaving a scaffold for the intestine, characterized in that, The weaving method employs a cylindrical clamp, which sequentially comprises a first layer, a second layer, and a third layer along its axial direction. The first and third layer regions each include at least two rows of positioning pins, and the second layer region includes at least one row of positioning pins. Each row of positioning pins in the first, second, and third layer regions includes at least four positioning pins evenly distributed along the circumference of the cylindrical clamp. The intestinal stent comprises a head segment, a body segment, and a tail segment connected sequentially. The weaving method includes the following steps: The first section weaving process includes: moving the first wire in a first V-shape between two adjacent rows of locating pins in the first layer area until the locating pins in the first layer area are completely or half-wound; and, when the locating pins in the first layer area are half-wound by the first wire, winding the second wire around the remaining locating pins in the first layer area. The main weaving process includes: moving the first wire in a second V-shape between adjacent rows of positioning pins in the last row of the first layer area, the second layer area, and the first row of the third layer area, until all the positioning pins in the last row of the first layer area, the second layer area, and the first row of the third layer area are completely wrapped. The tail section weaving process includes: the movement of the first wire is the same as that in the head section weaving process, the first wire makes the positioning pins of the third layer area completely or half-wound; when the positioning pins of the third layer area are half-wound by the first wire, the second wire makes the remaining positioning pins of the third layer area completely wound. Specifically, when the first or second wire is braided around adjacent A-row and B-row positioning pins, and returns to the A-row positioning pins, it wraps around the braided path between the A-row and B-row positioning pins and moves to the B-row positioning pins to form a reinforcing rib. Then, it begins to move between adjacent B-row and C-row positioning pins, where A, B, and C are any three adjacent rows of positioning pins. If there are two opposing V-shapes at the same locating pin, the first or second wire of the two opposing V-shapes are interlocked.

2. The method for weaving a scaffold for the intestine according to claim 1, characterized in that, With at least half of the locating pins in the first and third layer areas fully wound, the second wire is wound to fully cover the remaining locating pins in the first and third layer areas, comprising the following steps: The second wire moves in the first layer region from any locating pin that the first wire has not passed through, bending in the first V-shape between two adjacent rows of locating pins, until all the locating pins in the first layer region are completely wrapped around it. The second wire moves in the third layer region from any locating pin that the first wire has not passed through, bending in the first V-shape between two adjacent rows of locating pins, until all the locating pins in the third layer region are completely wrapped around it.

3. The method for weaving a scaffold for the intestine according to claim 2, characterized in that, As the second wire moves between each pair of adjacent rows of positioning pins, the second wire interweaves and passes over the braided path of the first wire.

4. The method for weaving a scaffold for the intestine according to claim 1, characterized in that, When the first wire has wrapped more than or equal to 3 times between each pair of adjacent locating pins, starting from the third loop of weaving, the first wire interweaves and passes through the already woven path of the previous loop or the previous two loops.

5. The method for weaving a scaffold for the intestine according to claim 1, characterized in that, The weaving method further includes forming another reinforcing rib parallel to the reinforcing rib on the second wire, as follows: The second wire is wound around the braided path of the first wire between the rows of positioning pins, starting from any of the locating pins that the reinforcing rib has not passed, in a direction parallel to the reinforcing rib, to form the other reinforcing rib.

6. The method for weaving a scaffold for the intestine according to claim 5, characterized in that, The reinforcing rib and the other reinforcing rib are arranged symmetrically with respect to the axis of the bracket.

7. The method for weaving a scaffold for the intestine according to claim 6, characterized in that, With the locating pins in the first and third layer areas completely wound, at least one third wire is also included, which is braided in the same way as the second wire to form a reinforcing rib, and the multiple reinforcing ribs are evenly distributed circumferentially.

8. The method for weaving a scaffold for the intestine according to claim 1, characterized in that, The number of positioning pins in each row of positioning pins in the first layer area and the number of positioning pins in each row of positioning pins in the third layer area are the same and adjacent rows are aligned with each other. The first V-shape spans (2m+1) locating pins in the same row, where m is an integer greater than 1; The last row of positioning pins in the first layer area, each row of positioning pins in the second layer area, and the first row of positioning pins in the third layer area have the same number of positioning pins, and adjacent rows are staggered. The second V-shape spans 2m' locating pins in the same row, where m' is an integer greater than 1.

9. The method for weaving a scaffold for the intestine according to claim 8, characterized in that, The m≥m'.

10. The method for weaving a scaffold for the intestine according to claim 8, characterized in that, The values ​​of m and m' are each 2 or 3 independently.

11. The method for weaving a scaffold for the intestine according to claim 1, characterized in that, The number of positioning pins in each row of positioning pins in the first layer area, the second layer area, and the third layer area is the same and they are staggered between adjacent rows; The first V-shape spans 2n locating pins located in the same row, where n is an integer greater than 1; The second V-shape spans 2n' locating pins in the same row, where n' is an integer greater than 1.

12. The method for weaving a scaffold for the intestine according to claim 11, characterized in that, The n>n'.

13. The method for weaving a scaffold for the intestine according to claim 11, characterized in that, The n and n' are each independently 2 or 3.

14. A stent for the intestine, characterized in that, The stent for the intestine is woven using the weaving method described in any one of claims 1 to 13.

Images