A tubular stent for knee ligament reconstruction and preparation method thereof

Abstract

The present invention discloses a tubular stent for knee joint ligament reconstruction, which is formed by weaving warp yarn and weft yarn, and is a tubular body after being unfolded, and includes two end closing sections and a middle section, each end closing section and the middle section are connected by a tubular plain section and a tubular interlaced section, one end of the tubular plain section is connected to the end closing section, and the other end is connected to one end of the tubular interlaced section, and the other end of the tubular interlaced section is connected to one end of the middle section; the spacing between the adjacent warps of the end closing section, the tubular plain section and the middle section is the same, and the pitch formed by weaving the tubular plain section and the middle section weft yarn is 2-5 times the pitch formed by weaving the end closing section weft yarn; the center spacing of each group of adjacent warps of the tubular interlaced section is 2-5 times the spacing between the adjacent warps of the tubular plain section, and the pitch formed by weaving the tubular interlaced section weft yarn is 1-2 times the pitch formed by weaving the tubular plain section weft yarn. The present invention has good tensile strength and force, can prevent secondary fracture of autologous transplants, and realize early rehabilitation exercise.

Description

Technical Field

[0001] The invention relates to the technical field of implantable medical device manufacturing, in particular to a tubular stent for knee joint ligament reconstruction and a preparation method thereof. Background Art

[0002] Rupture of the anterior cruciate ligament of the knee is a common disease, which mainly occurs during physical exercise. Due to its location and the poor formation of blood vessels in the joint, after rupture, the broken end will retract and degenerate. This will lead to looseness and instability of the knee joint, which will hinder or prevent normal sports activities and even daily life. The mainstream treatment method is to reconstruct the autologous ligament transplantation to restore the stability of the knee joint.

[0003] Traditional surgical techniques rely on autologous grafts to replace the cruciate ligaments. However, the use of autologous grafts often leads to secondary ruptures due to insufficient strength, and the recovery period for sports is longer than 6 months.

[0004] Therefore, people began to design ligament stents to cooperate with autologous grafts to assist in ligament reconstruction, one is to prevent secondary rupture of autologous grafts, and the other is to allow patients to resume a certain amount of daily activities and exercise in a short period of time. For example, on August 28, 2018, a Chinese utility model patent with the patent number ZL201720708472.1 and the name "A tubular artificial ligament" was disclosed. It is a tubular body formed by a braided structure formed by longitudinal polyester yarns and transverse polyester yarn chains and wound. The braided material has a certain length in the transverse direction without a longitudinal polyester yarn chain structure, and the transverse part without a longitudinal polyester yarn chain structure is cross-connected diagonally by two polyester yarns. After weaving, it is mechanically wound into a finished tubular artificial ligament stent. After the product is implanted, the damaged joint can twist freely and can enable the damaged joint to actively return to its original position better. However, the finished product of artificial ligament scaffold with this structure has two problems: first, the weaving structure is relatively simple and cannot quickly guide the reconstruction of knee ligaments; second, after weaving, it needs to be mechanically rolled into a tubular body, and then sutured, which has low processing efficiency and is prone to size deviation. It is also difficult to form sufficient holding force when fixing the transplanted tendon at the tibial end, and it is prone to loosening and slipping. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a tubular stent for knee ligament reconstruction, which has good tensile strength and force resistance, is easy to fix, reduces operation time, effectively prevents secondary fracture of autologous transplants, guides rapid reconstruction of knee ligaments, and realizes early rehabilitation exercises.

[0006] To achieve the above-mentioned purpose, the technical scheme of the present invention is: a tubular stent for knee ligament reconstruction, which is formed by weaving warp yarns and weft yarns, and is a tubular body after being unfolded, and includes two end closing sections and a middle section, each end closing section and the middle section are connected by a tubular plain section and a tubular interlaced section, one end of the tubular plain section is connected to the end closing section, and the other end is connected to one end of the tubular interlaced section, and the other end of the tubular interlaced section is connected to one end of the middle section;

[0007] The end closing section comprises a weft yarn and a plurality of warp yarns spaced apart along the axial direction of the tubular body, the weft yarn moves in a spiral shape along the circumference of the tubular body and cross-weaves with the plurality of warp yarns;

[0008] The tubular plain weave section comprises a plurality of warp yarns extending from the end closing section and a weft yarn that continues to move in a spiral shape along the circumference of the tubular body and is cross-woven with the plurality of warp yarns; the spacing between adjacent warp yarns in the end closing section is the same as the spacing between adjacent warp yarns in the tubular plain weave section, and the pitch formed by weaving the weft yarns in the tubular plain weave section is 2-5 times the pitch formed by weaving the weft yarns in the end closing section;

[0009] The tubular interlaced section includes a plurality of warp yarns extending from the tubular plain section, the plurality of warp yarns are divided into a plurality of groups of warp yarns, each group of warp yarns is composed of a plurality of adjacent warp yarns, each group of warp yarns is intertwined with each other, the weft yarns extend from the tubular plain section and continue to move in a spiral shape along the circumference of the tubular body and pass through each group of warp yarns intertwined with each other for weaving, the center spacing of each adjacent group of warp yarns is 2-5 times the spacing between adjacent warp yarns of the tubular plain section, and the pitch formed by weaving the weft yarns of the tubular interlaced section is 1-2 times the pitch formed by weaving the weft yarns of the tubular plain section;

[0010] The middle section includes a plurality of groups of warp yarns extending from the tubular interlaced section, the plurality of groups of warp yarns are separated to form a plurality of warp yarns having the same distribution as the tubular plain weave section, the weft yarns extend from the tubular interlaced section and continue to move in a spiral shape along the circumference of the tubular body and cross-weave with the plurality of warp yarns, the spacing between adjacent warp yarns on the middle section is the same as the spacing between adjacent warp yarns in the tubular plain weave section, and the pitch formed by weaving the weft yarns on the middle section is the same as the pitch formed by weaving the weft yarns in the tubular plain weave section;

[0011] The tubular interwoven section, tubular plain section and end closing section on the other side of the middle section are formed by reverse weaving of a plurality of warp yarns and a weft yarn according to the weaving structure of the above sections.

[0012] As a further improvement, a sparse section is provided in the middle of the tubular plain weave section, and the sparse section is formed by multiple warp yarns continuing to extend for a set distance, and then the weft yarns stop moving and weaving within the distance that the multiple warp yarns continue to extend, until the multiple warp yarns extend into place and the weft yarns jump to this position and continue to weave in the original movement mode.

[0013] As a further improvement, a sparse section is provided in the middle of the middle section, and the sparse section is formed by multiple warp yarns continuing to extend for a set distance, and then the weft yarns stop moving and weaving within this distance when the multiple warp yarns continue to extend, until the multiple warp yarns extend into place and the weft yarns jump to this position and continue to weave in the original movement mode.

[0014] Preferably, the minimum inner diameter of the tubular body is Φ8mm-12mm. Further preferably, the minimum inner diameter of the tubular body is Φ10mm.

[0015] Preferably, the spacing between adjacent warp yarns in the end closing section, the spacing between adjacent warp yarns in the tubular plain weave section, and the spacing between adjacent warp yarns in the middle section are all 1-3 mm; the center spacing between adjacent groups of warp yarns in the tubular interlaced section is 2 mm-6 mm.

[0016] Preferably, the pitch formed by weft yarn weaving of the end closing section is 0.5mm-1mm; the pitch formed by weft yarn weaving of the tubular plain weave section is 1mm-5mm; the pitch formed by weft yarn weaving of the tubular interlaced section is 2mm-8mm; and the pitch formed by weft yarn weaving of the middle section is 1mm-5mm.

[0017] Further improvement, the warp yarns of the end closing section, tubular plain section, tubular interlaced section and middle section are double-layer structures, the weft yarns are first woven with the upper warp yarns in a spiral motion, then woven with the lower warp yarns, and then woven with the upper warp yarns, and the weft yarns are cross-woven with the upper and lower warp yarns to form the above-mentioned structures. The tubular stent with a double-layer structure has better strength and is more resistant to pulling.

[0018] Furthermore, in the tubular interlacing section, each group of warp yarns is two, three or four; when each group of warp yarns is two, the weft yarn passes between the two winding warp yarns; when each group of warp yarns is three, one of the warp yarns is wound with the other two non-crossing warp yarns, and the weft yarn passes between one winding warp yarn and the other two non-crossing warp yarns; when each group of warp yarns is four, two of the warp yarns are wound with each other and wound with the other two non-crossing warp yarns, and the weft yarn passes between the two winding warp yarns and the other two non-crossing warp yarns, so as to facilitate weaving.

[0019] As a further improvement, each of the tubular plain weave sections is provided with a side opening in the middle, and the side opening is formed by the weft yarn reaching the warp yarn at the upper edge of the side opening, the weft yarn bypassing the warp yarn and knitting in reverse to the warp yarn at the lower edge of the side opening, and then knitting in reverse until the side opening is knitted to form the weft yarn, and then knitting continues along the original spiral direction. By providing the side opening in the middle of the tubular plain weave section, the tendon can be transplanted conveniently through the side opening, thereby improving the convenience of operation.

[0020] Furthermore, a circle of edge yarns with different colors from the warp yarns and the weft yarns is woven around the side opening, and the edge yarns are connected and woven with the weft yarns. The different color designs are conducive to observation and identification under arthroscopy, which is convenient for doctors to operate accurately and saves operation time.

[0021] As a further improvement, the braided tubular stent is washed and dried and then a collagen coating is added to the inner and outer surfaces. After the tubular stent wrapped with collagen is used, bone marrow cells proliferate vigorously, which can effectively promote the healing of bone grafts.

[0022] Furthermore, the cleaning is to soak the braided tubular stent in acetone or ethanol or isopropanol solution and start ultrasonic cleaning, and then rinse with pure water; the cleaned tubular stent is dried in an environment of 60-80°C; the dried tubular stent is then treated with plasma, and then the tubular stent is placed in a collagen solution and soaked for a set time, taken out and vacuum dried to form a tubular stent with collagen coating on the inner and outer surfaces. This cleaning method can effectively remove impurities and particles adsorbed by static electricity in the fabric. Or remove organic additives, oil stains, etc. introduced during the material processing process. It can reduce the occurrence of inflammation and improve the biosafety of the tubular stent. Secondly, the hydrophilicity of the inner and outer surfaces of the tubular stent can be increased by plasma treatment, and collagen can be better attached; and the collagen coating formed on the surface of the tubular stent can be better protected by vacuum drying.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. By weaving it into a tubular body, the winding and suturing processes in the processing are reduced, the processing efficiency is higher, the size is more stable, and the tensile strength and force resistance are better, which is easy to fix, can reduce the operation time, and effectively prevent the secondary fracture of the autologous transplant.

[0025] 2. Guide the rapid reconstruction of knee ligaments through reasonable segmented structural design, achieve early rehabilitation training and return to sports. The two end closing sections are set because they are the most tightly woven and bear the greatest force, which is convenient for fixing the two ends with the autologous graft through nails. Secondly, it can prevent the deformation, looseness and yarn shedding of the fabric in the middle sections due to the large pores, making the ligament bracket more solid as a whole; by setting a tubular plain section connected to the end closing section, since the mesh of the tubular plain section is larger than the end closing section, it is convenient to transplant the tendon from this section, which is beneficial to the tendon-bone healing of the transplanted tendon; by setting a tubular interwoven section connected to the tubular plain section, since the mesh of the tubular interwoven section is the largest, it can better induce tissue regeneration, reduce the wear and stimulation of the mesh knot on the tendon, ensure the nutrition of the synovial fluid, and promote the creeping replacement and reconstruction of the transplanted tendon; in addition, its multiple warp yarns are divided into multiple groups of warp yarns, each group of warp yarns is composed of multiple adjacent warp yarns, and each group of warp yarns is intertwined with each other, which is stronger in the axial force of the tubular body and more resistant to pulling. The middle section has the same weaving structure as the tubular plain section, which is beneficial to the fixation of the transplanted tendon and the healing of the tissue near the middle section. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a front view of the first embodiment of the present invention in an expanded state;

[0027] Figure 2 yes Figure 1 Left view;

[0028] Figure 3 It is a schematic diagram of the connection between the tubular interlaced section and the weft yarn when each group of warp yarns has two yarns;

[0029] Figure 4 It is a schematic diagram of the connection between the tubular interlaced section and the weft yarn when each group of warp yarns has three yarns;

[0030] Figure 5 It is a schematic diagram of the connection between the tubular interlaced section and the weft yarn when each group of warp yarns has four yarns;

[0031] Figure 6 It is a schematic diagram of the winding method of the weft yarn and different warp yarns to form the side opening;

[0032] Figure 7 It is a schematic diagram of a device for weaving the end closing section, tubular plain weave section and middle section of the tubular body of the present invention;

[0033] Figure 8 yes Figure 7 Schematic diagram of the winding method of the middle weft yarn and different warp yarns;

[0034] Fig. 9 is a schematic diagram of a device for weaving tubular interwoven segments of a tubular body of the present invention;

[0035] Fig.10It is a schematic diagram of a device for weaving the end closing section, tubular plain weave section and middle section of the double-layer structure of the tubular body of the present invention;

[0036] Fig.11 yes Fig.10 Schematic diagram of the winding method of the middle weft yarn and two layers of different warp yarns;

[0037] Fig.12 It is a schematic diagram of a device for weaving tubular interwoven segments of a double-layer structure of a tubular body of the present invention;

[0038] Fig.13 It is the main view of the expanded state of the second embodiment of the present invention. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0040] Embodiment 1 Figures 1 to 3 As shown, a tubular stent for knee ligament reconstruction is formed by weaving warp yarn 10 and weft yarn 20, and after unfolding, it becomes a tubular body 100, and the minimum inner diameter D of the tubular body 100 can be Φ8mm-12mm. It is further preferred that the minimum inner diameter D of the tubular body 100 is Φ10mm;

[0041] The tubular body 100 includes two end closing sections 1 and a middle section 2. Each end closing section 1 and the middle section 2 are connected through a tubular plain section 3 and a tubular interwoven section 4. One end of the tubular plain section 3 is connected to the end closing section 1 and the other end is connected to one end of the tubular interwoven section 4. The other end of the tubular interwoven section 4 is connected to one end of the middle section 2.

[0042] The end closing section 1 includes a weft yarn 20 and a plurality of warp yarns 10 axially spaced and distributed along the tubular body 100 . The weft yarn 20 moves in a spiral shape along the circumference of the tubular body 100 and is cross-woven with the plurality of warp yarns 10 .

[0043] The tubular plain weave section 3 includes a plurality of warp yarns 10 extending from the end closing section 1 and a weft yarn 20 that continues to move in a spiral shape along the circumference of the tubular body 100 and is cross-woven with the plurality of warp yarns 10; the spacing between adjacent warp yarns 10 in the end closing section 1 is the same as the spacing between adjacent warp yarns 10 in the tubular plain weave section 3, and the pitch formed by weaving the weft yarns 20 in the tubular plain weave section 3 is 2-5 times the pitch formed by weaving the weft yarns 20 in the end closing section 1; in this embodiment, preferably, the spacing between adjacent warp yarns 10 in the end closing section 1 and the spacing between adjacent warp yarns 10 in the tubular plain weave section 3 are both 1-3mm, and more preferably 2mm; the pitch formed by weaving the weft yarns 20 in the end closing section 1 is 1mm, and the pitch formed by weaving the weft yarns 20 in the tubular plain weave section 3 is 3mm.

[0044] The tubular interlaced section 4 includes a plurality of warp yarns 10 extending from the tubular plain section 3, the plurality of warp yarns 10 are divided into a plurality of groups of warp yarns 10, each group of warp yarns 10 is composed of a plurality of adjacent warp yarns 10, each group of warp yarns 10 is intertwined with each other, the weft yarns 20 extend from the tubular plain section 3 and continue to move in a spiral shape along the circumference of the tubular body 100 and pass through each group of warp yarns 10 intertwined with each other for weaving, the center spacing of each adjacent group of warp yarns 10 is 2-5 times the spacing between adjacent warp yarns 10 of the tubular plain section 3, and the pitch formed by weaving the weft yarns 20 of the tubular interlaced section 4 is 1-2 times the pitch formed by weaving the weft yarns 20 of the tubular plain section 3; in this embodiment, each group of warp yarns 10 is composed of two adjacent warp yarns 10, such as Figure 3 As shown, the weft yarn 20 passes between two wound warp yarns 10; the pitch of the weft yarn 20 woven into the tubular interlacing section 4 is 4 mm.

[0045] If each group of warp yarns 10 has three strands, Figure 4 As shown, one of the warp yarns 10 is intertwined with the other two non-crossed warp yarns 10, and the weft yarn 20 passes between one of the intertwined warp yarns 10 and the other two non-crossed warp yarns 10;

[0046] If each group of warp yarns 10 has four ends, Figure 5 As shown, two warp yarns 10 are wound around each other and two other non-crossed warp yarns 10, and the weft yarn 20 passes between the two wound warp yarns 10 and the other two non-crossed warp yarns 10.

[0047] The middle section 2 includes a plurality of groups of warp yarns 10 extending from the tubular interlaced section 4, and the plurality of groups of warp yarns 10 are separated to form a plurality of warp yarns 10 having the same distribution as the tubular plain weave section 3. The weft yarns 20 extend from the tubular interlaced section 4 and continue to move in a spiral shape along the circumference of the tubular body 100 and are cross-woven with the plurality of warp yarns 10. The spacing between adjacent warp yarns 10 on the middle section 2 is the same as the spacing between adjacent warp yarns 10 in the tubular plain weave section 3. The pitch formed by weaving the weft yarns 20 on the middle section 2 is the same as the pitch formed by weaving the weft yarns 20 in the tubular plain weave section 3. Specifically, preferably, the spacing between adjacent warp yarns 10 on the middle section 2 is 2 mm; and the pitch formed by weaving the weft yarns 20 on the middle section 2 is 3 mm.

[0048] The tubular interwoven section 4, tubular plain section 3 and end closing section 1 on the other side of the middle section 2 are formed by reverse weaving of a plurality of warp yarns 10 and a weft yarn 20 according to the weaving structure of the above sections.

[0049] A sparse section 5 is provided in the middle of the tubular plain weave section 3. The sparse section 5 is formed by the plurality of warp yarns 10 continuing to extend for a set distance, and then the weft yarn 20 stops moving and weaving within this distance when the plurality of warp yarns 10 continue to extend, until the plurality of warp yarns 10 extend to the position and the weft yarn 20 jumps to the position and continues to weave in the original movement mode.

[0050] A sparse section 5 is provided in the middle of the middle section 2. The sparse section 5 is formed by the multiple warp yarns 10 continuing to extend for a set distance, and then the weft yarns 20 stop moving and weaving within this distance when the multiple warp yarns 10 continue to extend, until the multiple warp yarns 10 extend to the position and the weft yarns 20 jump to this position and continue to weave in the original movement mode.

[0051] Each tubular plain weave section 3 is provided with a side opening 31 in the middle, and the side opening 31 is provided with a weft yarn 20 reaching the warp yarn 10 at the upper edge of the side opening 31, and the weft yarn 20 goes around the warp yarn 10 and moves in the reverse direction to the warp yarn 10 at the lower edge of the side opening 31, and then moves in the reverse direction to weave until the side opening 31 weaves the weft yarn 20 and then continues to weave along the original spiral direction, such as Figure 6 The side opening 31 can be used as a tendon transplantation entrance, and a traction line can be used to introduce the tendon from one side of the side opening 31 and then traction to the middle section 2, so that the tubular stent and the tendon are combined and fixed to effectively improve the overall strength.

[0052] A circle of edge yarn 32 of a different color from the warp yarn 10 and the weft yarn 20 is woven around the side opening 31, and the edge yarn 32 is connected and woven with the weft yarn 20. If the warp yarn 10 and the weft yarn 20 are white, the edge yarn 32 can be yellow or green. Different color designs are conducive to observation and identification under arthroscopy, and are convenient for doctors to operate accurately.

[0053] In this embodiment, the end closing section 1, the tubular plain section 3, and the middle section 2 can be made of Figure 7 The device shown in the figure is used for weaving. The warp yarn 10 is released from the creel 1a and is woven with the weft yarn 20 driven by the shuttle 5a at the weaving shaft 4a through two heald frames 2a, heald buckle 3a, and then is wound on the winding shaft 6a. During the weaving process, the weft yarn 20 is wound with different warp yarns 10 in the following manner: Figure 8 shown.

[0054] The tubular interlaced section 4 may be formed as follows: Fig. 9 The device shown is used for weaving. Figure 7 On the basis of the device shown, two twisted heald frames 7a are added between the two heald frames 2a and the heald buckles 3a. The twisted heald frames 7a wind multiple groups of warp yarns 10 and then pass through the heald buckles 3a to reach the weaving shaft 4a for weaving with the weft yarns 20 driven by the shuttle 5a, and then are collected on the winding shaft 6a after weaving.

[0055] When this embodiment is used, the autograft is inserted in the middle of the tubular body 100, and then fixed to the tibia and femur with steel nails through the two end closing sections 1 and the two ends of the autograft. A tubular plain section 3 is located at the tibial end bone tunnel section.

[0056] Another deformation structure of the present embodiment is: the warp yarn 10 of the end closing section 1, the tubular plain weave section 3, the tubular interlaced section 4 and the middle section 2 is a double-layer structure, and the weft yarn 20 is first woven with the upper warp yarn 10 for one layer in a spiral motion manner, and then woven with the lower warp yarn 10, and then turned to be woven with the upper warp yarn 10, and the weft yarn 20 is cross-woven with the upper and lower warp yarns 10 to form the above-mentioned sections.

[0057] The double-layer structure end closing section 1, tubular plain section 3, and middle section 2 can be made of Fig.10 The device shown in the figure is used for weaving. The warp yarn 10 is released from the creel 1a and passes through four heald frames 2a and heald buckles 3a to form two layers. Then, it is woven with the weft yarn 20 driven by the shuttle 5a at the weaving shaft 4a and finally collected on the winding shaft 6a. During the weaving process, the winding method of the weft yarn 20 and the two layers of different warp yarns 10 is as follows: Fig.11 shown.

[0058] The tubular interlaced section 4 of this double-layer structure can be made of Fig.12 The device shown is used for weaving. Fig.10 On the basis of the device shown, two twisted heald frames 7a are added between the four heald frames 2a and the heald buckles 3a. The twisted heald frames 7a wind the double-layer multiple groups of warp yarns 10 and then pass through the heald buckles 3a to reach the weaving shaft 4a for weaving with the weft yarns 20 driven by the shuttle 5a, and then are collected on the winding shaft 6a after weaving.

[0059] The material of the warp yarn 10 and the weft yarn 20 of the present embodiment can be selected from one or a combination of two or more of ultra-high molecular weight polyethylene fiber, polyethylene terephthalate fiber, and polypropylene fiber.

[0060] The warp yarn 10 of the end closing section 1 can be cut by melting after heating, which has the characteristic that after the fiber is heated and melted, it can prevent loosening and cracking.

[0061] It should be noted here that the weft yarn 20 specified in the present invention moves in a spiral shape along the circumference of the tubular body 100 and cross-weaves with multiple warp yarns 20 for the case where the tubular support is unfolded into a tubular body, while in actual weaving, the weft yarn 20 moves with the shuttle 5a, and the shuttle 5a shuttles and weaves according to the position of the warp yarn 20, and it does not need to actually move in a spiral shape.

[0062] The braided tubular stent of this embodiment is washed and dried, and then a collagen coating is added to its inner and outer surfaces. The washing is to soak the braided tubular stent in acetone, ethanol or isopropanol solution and start ultrasonic cleaning, and then rinse with pure water; the washed tubular stent is dried in an environment of 60-80°C; the dried tubular stent is then treated with plasma, and then the tubular stent is placed in the collagen solution and soaked for a set time (such as the soaking time can be set to 1-2 hours), then taken out and vacuum dried to form a tubular stent with collagen coating on the inner and outer surfaces. This makes the bone marrow cells proliferate vigorously after the use of the tubular stent, effectively promoting the healing of bone grafts.

[0063] Embodiment 2 Fig.13 As shown, a tubular stent for knee ligament reconstruction is provided, which is different from the first embodiment in that a plurality of sparse sections 5 are provided on the middle section 2 .

[0064] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A tubular stent for knee ligament reconstruction, which is woven from warp yarns and weft yarns and is a tubular body after being unfolded, characterized in that: It comprises two end closing sections and a middle section, each end closing section and the middle section are connected by a tubular plain section and a tubular interwoven section, one end of the tubular plain section is connected to the end closing section, the other end is connected to one end of the tubular interwoven section, and the other end of the tubular interwoven section is connected to one end of the middle section; The end closing section comprises a weft yarn and a plurality of warp yarns spaced apart along the axial direction of the tubular body, the weft yarn moves in a spiral shape along the circumference of the tubular body and cross-weaves with the plurality of warp yarns; The tubular plain weave section comprises a plurality of warp yarns extending from the end closing section and a weft yarn that continues to move in a spiral shape along the circumference of the tubular body and is cross-woven with the plurality of warp yarns; the spacing between adjacent warp yarns in the end closing section is the same as the spacing between adjacent warp yarns in the tubular plain weave section, and the pitch formed by weaving the weft yarns in the tubular plain weave section is 2-5 times the pitch formed by weaving the weft yarns in the end closing section; The tubular interlaced section includes a plurality of warp yarns extending from the tubular plain section, the plurality of warp yarns are divided into a plurality of groups of warp yarns, each group of warp yarns is composed of a plurality of adjacent warp yarns, each group of warp yarns is intertwined with each other, the weft yarns extend from the tubular plain section and continue to move in a spiral shape along the circumference of the tubular body and pass through each group of warp yarns intertwined with each other for weaving, the center spacing of each adjacent group of warp yarns is 2-5 times the spacing between adjacent warp yarns of the tubular plain section, and the pitch formed by weaving the weft yarns of the tubular interlaced section is 1-2 times the pitch formed by weaving the weft yarns of the tubular plain section; The middle section includes a plurality of groups of warp yarns extending from the tubular interlaced section, the plurality of groups of warp yarns are separated to form a plurality of warp yarns having the same distribution as the tubular plain weave section, the weft yarns extend from the tubular interlaced section and continue to move in a spiral shape along the circumference of the tubular body and cross-weave with the plurality of warp yarns, the spacing between adjacent warp yarns on the middle section is the same as the spacing between adjacent warp yarns in the tubular plain weave section, and the pitch formed by weaving the weft yarns on the middle section is the same as the pitch formed by weaving the weft yarns in the tubular plain weave section; The tubular interwoven section, tubular plain section and end closing section on the other side of the middle section are formed by reverse weaving of a plurality of warp yarns and a weft yarn according to the weaving structure of the above sections.

2. A tubular stent for knee ligament reconstruction according to claim 1, characterized in that: A sparse section is provided in the middle of the tubular plain weave section. The sparse section is formed by multiple warp yarns extending for a set distance, and then the weft yarns stop moving and weaving within the distance when the multiple warp yarns continue to extend, until the multiple warp yarns extend to the position and the weft yarns jump to the position and continue to weave in the original movement mode.

3. The tubular stent for knee ligament reconstruction according to claim 1, characterized in that: A sparse section is provided in the middle of the middle section, and the sparse section is formed by multiple warp yarns continuing to extend for a set distance, and then the weft yarns stop moving and weaving within the distance when the multiple warp yarns continue to extend, until the multiple warp yarns extend into place and the weft yarns jump to this position and continue to weave in the original movement mode.

4. The tubular stent for knee ligament reconstruction according to claim 1, characterized in that: The minimum inner diameter of the tubular body is Φ8mm-12mm.

5. The tubular stent for knee ligament reconstruction according to claim 1, characterized in that: The spacing between adjacent warp yarns in the end closing section, the spacing between adjacent warp yarns in the tubular plain weave section, and the spacing between adjacent warp yarns in the middle section are all 1-3mm; the center spacing between each group of adjacent warp yarns in the tubular interlaced section is 2mm-6mm.

6. The tubular stent for knee ligament reconstruction according to claim 1, characterized in that: The pitch formed by weft yarn weaving in the end closing section is 0.5mm-1mm; the pitch formed by weft yarn weaving in the tubular plain weave section is 1mm-5mm; the pitch formed by weft yarn weaving in the tubular interlaced section is 2mm-8mm; the pitch formed by weft yarn weaving in the middle section is 1mm-5mm.

7. The tubular stent for knee ligament reconstruction according to claim 1, characterized in that: The warp yarns of the end closing section, tubular plain weave section, tubular interlaced section and middle section are double-layer structures, and the weft yarns are first woven with the upper warp yarns in a spiral motion, then woven with the lower warp yarns, and then turned to be woven with the upper warp yarns, and the weft yarns are cross-woven with the upper and lower warp yarns to form the above-mentioned sections.

8. The tubular stent for knee ligament reconstruction according to claim 1, characterized in that: In the tubular interlacing section, each group of warp yarns consists of two, three or four yarns; when each group of warp yarns consists of two yarns, the weft yarn passes between the two wound warp yarns; when each group of warp yarns consists of three yarns, one of the warp yarns is wound around the other two non-crossed warp yarns, and the weft yarn passes between one wound warp yarn and the other two non-crossed warp yarns; when each group of warp yarns consists of four yarns, two of the warp yarns are wound around each other and around the other two non-crossed warp yarns, and the weft yarn passes between the two wound warp yarns and the other two non-crossed warp yarns.

9. The tubular stent for knee ligament reconstruction according to claim 1, characterized in that: A side opening is provided in the middle of each tubular plain weave section, and the side opening is formed by the weft yarn reaching the warp yarn at the upper edge of the side opening, and the weft yarn bypasses the warp yarn and moves in reverse to be woven to the warp yarn at the lower edge of the side opening, and then moves in reverse to be woven until the side opening forms the weft yarn and then continues to be woven along the original spiral direction.

10. The tubular stent for knee ligament reconstruction according to claim 9, characterized in that: A circle of edge yarn with a color different from the warp yarn and the weft yarn is woven around the side opening, and the edge yarn is connected and woven with the weft yarn.

11. A tubular stent for knee ligament reconstruction according to any one of claims 1 to 10, characterized in that: The braided tubular stent is cleaned and dried, and then a collagen coating is added to the inner and outer surfaces thereof.

12. A tubular stent for knee ligament reconstruction according to claim 11, characterized in that: The cleaning is to immerse the braided tubular stent in acetone, ethanol or isopropanol solution and start ultrasonic cleaning, and then rinse with pure water; the cleaned tubular stent is dried in an environment of 60-80°C; the dried tubular stent is then treated with plasma, and then the tubular stent is immersed in a collagen solution for a set time, taken out and vacuum dried to form a tubular stent with collagen coating on the inner and outer surfaces.

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