CN116236317A

CN116236317A - Tubular support for knee joint ligament reconstruction and preparation method thereof

Info

Publication number: CN116236317A
Application number: CN202211638807.9A
Authority: CN
Inventors: 郭氧; 林意华; 缪凤; 蒋恒翔; 曾达; 王建雄; 蔡国雄; 郑洪鹏
Original assignee: Double Medical Technology Inc
Current assignee: Double Medical Technology Inc
Priority date: 2022-12-20
Filing date: 2022-12-20
Publication date: 2023-06-09

Abstract

The utility model discloses a tubular support for reconstructing knee joint ligaments, which is formed by weaving warp yarns and weft yarns, and is a tubular body after being unfolded, and comprises two end closing sections and a middle section, wherein each end closing section and the middle section are connected through a tubular plain section and a tubular interweaving section, one end of the tubular plain section is connected with the end closing section, the other end of the tubular plain section is connected with one end of the tubular interweaving section, and the other end of the tubular interweaving section is connected with one end of the middle section; the spacing between the adjacent warp yarns of the end closing-up section, the tubular plain weave section and the middle section is the same, and the thread pitch formed by weaving the weft yarns of the tubular plain weave section and the middle section is 2-5 times of the thread pitch formed by weaving the weft yarns of the end closing-up section; the center distance between every two adjacent groups of warp yarns of the tubular interweaving section is 2-5 times of the distance between the adjacent warp yarns of the tubular plain weaving section, and the thread pitch formed by weaving the weft yarns of the tubular interweaving section is 1-2 times of the thread pitch formed by weaving the weft yarns of the tubular plain weaving section. The utility model has better tensile strength and stress, can prevent the secondary fracture of autograft and realize early rehabilitation exercise.

Description

Tubular support for knee joint ligament reconstruction and preparation method thereof

Technical Field

The utility model relates to the technical field of manufacturing of implantable medical devices, in particular to a tubular bracket for reconstructing knee joint ligaments and a preparation method thereof.

Background

Fracture of the anterior cruciate ligament of the knee is a common disorder, occurring mainly in the movement of the subject. Due to its location and the lack of intra-articular vascularization, after fracture, it will progress toward retraction and degeneration of the fractured tip. Resulting in a loose, unstable knee joint that will interfere with or prevent normal physical activity, even in daily life. The main stream of the treatment method is autologous ligament transplantation and reconstruction, and the stability of the knee joint is restored.

Conventional surgical techniques rely on autografts to replace the cruciate ligaments, however the use of autografts often results in secondary breaks due to insufficient strength and longer recovery cycles for exercise of greater than 6 months.

Ligament stents have therefore been designed to cooperate with autografts to assist ligament reconstruction, firstly to prevent secondary fracture of the autograft and secondly to allow the patient to resume a certain amount of daily activity and exercise in a short period of time. For example, 28 days of 2018, a chinese patent No. ZL201720708472.1, named "a tubular artificial ligament", is disclosed, which is a tubular body formed by winding a woven structure formed by longitudinal polyester yarns and transverse polyester yarn chains, wherein the woven material has a certain length in the transverse direction without the longitudinal polyester yarn chain structure, and the transverse portion of the non-longitudinal polyester yarn chain structure is diagonally connected by two polyester yarns. After knitting, the artificial ligament stent is mechanically coiled into a finished product of the tubular artificial ligament stent. After the product is implanted, the damaged joint can freely twist and can be better and actively restored to the original position. However, the finished product of the artificial ligament support with the structure is simple in weaving structure, and the knee joint ligament can not be quickly guided to be quickly rebuilt; in addition, the knitted fabric is required to be mechanically wound into a tubular body, and the knitted fabric is required to be sutured after winding, so that the knitted fabric is low in processing efficiency, easily has dimensional deviation, is difficult to form enough holding force with a transplanted tendon when the transplanted tendon is fixed at a tibia end, and easily has loosening and slipping phenomena.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a tubular support for reconstructing knee joint ligaments, which has the advantages of better tensile strength and stress, convenient fixation, reduced operation time, effective prevention of secondary fracture of autograft, guiding rapid reconstruction of knee joint ligaments and realizing early rehabilitation exercise.

In order to achieve the above purpose, the technical scheme of the utility model is as follows: a tubular support for knee joint ligament reconstruction is formed by weaving warp yarns and weft yarns, and is a tubular body after being unfolded, the tubular support comprises two end closing-in sections and a middle section, each end closing-in section and the middle section are connected through a tubular plain section and a tubular interweaving section, one end of the tubular plain section is connected with the end closing-in section, the other end of the tubular plain section is connected with one end of the tubular interweaving section, and the other end of the tubular interweaving section is connected with one end of the middle section;

the end closing-in section comprises a weft yarn and a plurality of warp yarns which are distributed at intervals along the axial direction of the tubular body, and the weft yarn moves spirally along the circumferential direction of the tubular body and is woven with the warp yarns in a crossing manner;

the tubular plain section comprises a plurality of warp yarns extending from the end closing-in section, and weft yarns continuously spirally moving along the circumferential direction of the tubular body and being crossly woven with the plurality of warp yarns; the pitch between the adjacent warp yarns of the end closing-up section is the same as the pitch between the adjacent warp yarns of the tubular plain weave section, and the pitch formed by weaving the weft yarns of the tubular plain weave section is 2-5 times of the pitch formed by weaving the weft yarns of the end closing-up section;

the tubular interweaving section comprises 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 consists of a plurality of adjacent warp yarns, each group of warp yarns are intertwined, the weft yarns extend out of the tubular plain section and continuously spirally move along the circumferential direction of the tubular body and pass through each group of intertwined warp yarns for knitting, the center-to-center distance of each adjacent group of warp yarns is 2-5 times of the distance between the adjacent warp yarns of the tubular plain section, and the pitch formed by knitting the weft yarns of the tubular interweaving section is 1-2 times of the pitch formed by knitting the weft yarns of the tubular plain section;

the middle section comprises a plurality of groups of warp yarns extending from a tubular interweaving section, the plurality of groups of warp yarns are separated to form a plurality of warp yarns which are identical to the tubular plain weave section in distribution, the weft yarns extend from the tubular interweaving section and continuously spirally move along the circumferential direction of the tubular body and are in cross knitting with the plurality of warp yarns, the interval between adjacent warp yarns on the middle section is identical to the interval between the adjacent warp yarns on the tubular plain weave section, and the pitch formed by weft yarn knitting on the middle section is identical to the pitch formed by weft yarn knitting on the tubular plain weave section;

the tubular interweaving section, the tubular plain weave section and the end closing section on the other side of the middle section are formed by reversely braiding a plurality of warp yarns and a weft yarn according to the braiding structures of the sections.

Further improved, a sparse section is arranged in the middle of the tubular plain section, the sparse section is formed by continuously extending a set distance from a plurality of warp yarns, then the weft yarns stop moving and weaving within the set distance from the continuously extending warp yarns until the weft yarns jump to the position after the extending warp yarns are in place, and then the weft yarns continue to weave according to the original moving mode.

Further improved, a sparse section is arranged in the middle of the middle section, the sparse section is formed by continuously extending a set distance from a plurality of warp yarns, then the weft yarns stop moving and weaving within the set distance from the continuously extending warp yarns, and the weft yarns continue to weave according to the original moving mode after the weft yarns jump to the position after the warp yarns extend in place.

Preferably the tubular body has a minimum inner diameter of from Φ8mm to 12mm. Still more preferably, the tubular body has a minimum inner diameter of Φ10mm.

Preferably, the spacing between the adjacent warp yarns of the end closing-up section, the spacing between the adjacent warp yarns of the tubular plain weave section and the spacing between the adjacent warp yarns of the middle section are all 1-3mm; the center-to-center spacing between every two adjacent groups of warp yarns of the tubular interweaving sections is 2mm-6mm.

Preferably, the end closing-up section weft yarns are woven to form a thread pitch of 0.5mm-1mm; the thread pitch formed by weaving the tubular plain weave section weft yarns is 1mm-5mm; the thread pitch formed by braiding the weft yarns of the tubular interweaving sections is 2mm-8mm; the pitch of the weft yarn at the middle section is 1mm-5mm.

The warp yarns of the end closing-in section, the tubular plain weave section, the tubular interweaving section and the middle section are of double-layer structures, weft yarns are woven with the upper layer warp yarns for one layer according to a spiral motion mode, then woven with the lower layer warp yarns, and then woven with the upper layer warp yarns, and the weft yarns are woven with the upper layer warp yarns and the lower layer warp yarns in a crossed mode to form the structures of the sections. The tubular stent with the double-layer structure has better strength and more traction resistance.

Further, in the tubular interweaving section, each group of warp yarns is two or three or four; when each group of warp yarns is two, weft yarns pass through the space between two winding warp yarns, and when each group of warp yarns is three, one warp yarn is wound with the other two non-crossing warp yarns, and weft yarns pass through the space between one winding warp yarn and the other two non-crossing warp yarns; when each group of warp yarns is four, two warp yarns are wound and wound with the other two non-crossing warp yarns, and the weft yarns pass through between the two winding warp yarns and the other two non-crossing warp yarns. To facilitate braiding.

Further improved, each tubular plain section is provided with a side opening in the middle, the side opening is formed by reversely moving and braiding weft yarns around the weft yarns at the positions of the upper side edge warp yarns of the side opening to the positions of the lower side edge warp yarns of the side opening through weft yarns, and the weft yarns are reversely moved and braided until the weft yarns are formed by reversely weaving the side opening, and then the weaving is continued along the original spiral direction. Through set up the side trompil at tubulose plain weave section middle part, can conveniently transplant the tendon through the side trompil, promote the convenience of operation.

Still further, the side aperture perimeter is woven with a loop of edge yarn of a different color than the warp yarns and the weft yarns, the edge yarn being woven in connection with the weft yarns. The design of different colors is favorable for observation and identification under an arthroscope, is convenient for doctors to accurately operate, and saves operation time.

Further improved, the braided tubular stent is cleaned and dried, and then collagen coating is added on the inner and outer surfaces of the tubular stent. After the tubular stent wrapped by collagen is used, bone marrow cells are proliferated and can effectively promote the healing of bone grafts.

Still further, the cleaning is to soak the tubular support woven in acetone or ethanol or isopropanol solution and start ultrasonic cleaning, then use the purified water to rinse; drying the cleaned tubular support in an environment of 60-80 ℃; and then carrying out plasma treatment on the dried tubular stent, then putting the tubular stent into a collagen solution for soaking for a set time, taking out, and then carrying out vacuum drying to form the tubular stent with the collagen coating on the inner surface and the outer surface. The cleaning mode can effectively remove impurities and particles adsorbed by static electricity in the fabric. Or removing organic auxiliary agents, greasy dirt and the like introduced in the material processing process. Can reduce inflammation and improve biosafety of tubular stent. Secondly, the hydrophilicity of the inner surface and the outer surface of the tubular stent can be increased through plasma treatment, and collagen can be better adhered; and then the collagen coating formed on the surface of the tubular stent can be better protected by a vacuum drying mode.

The utility model has the following beneficial effects:

1. the tubular body is woven integrally, the winding and sewing procedures in processing are reduced, the processing efficiency is high, the size is stable, the tensile strength and the stress are high, the fixation is convenient, the operation time can be reduced, and the secondary fracture of the autograft is effectively prevented.

2. The knee joint ligament is guided to be quickly rebuilt through reasonable sectional structure design, so that early rehabilitation exercise and return movement are realized. The two end closing sections are arranged, so that the two end closing sections are tightly woven and are stressed maximally, the two ends of the two end closing sections are conveniently fixed with an autograft through nails, and the problems of deformation, loosening and yarn falling caused by larger pores of fabrics in the middle sections can be prevented, so that the whole ligament stent is firmer; by arranging the tubular plain section connected with the end closing-in section, the tendon is conveniently transplanted from the end closing-in section because the mesh holes of the tubular plain section are larger than those of the end closing-in section, and tendon bone healing of the transplanted tendon is facilitated; by arranging the tubular interweaving sections connected with the tubular plain sections, tissue regeneration can be well induced due to the maximum meshes of the tubular interweaving sections, abrasion stimulation of mesh knots to tendons is reduced, nutrition of joint fluid is ensured, creeping substitution of transplanted tendons is promoted, and modeling is rebuilt; in addition, the plurality of warp yarns are divided into a plurality of groups of warp yarns, each group of warp yarns consists of a plurality of adjacent warp yarns, and each group of warp yarns is intertwined, so that the axial stress of the tubular body is stronger and the tubular body is more resistant to traction. The weaving structure of the middle section and the tubular plain weave section is the same, which is beneficial to fixation of transplanted tendons and healing of tissues near the middle section.

Drawings

FIG. 1 is a front view of a first embodiment of the present utility model in an expanded state;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is a schematic illustration of the connection of the warp yarns to the weft yarns for each set of warp yarns in a tubular interweaving section;

FIG. 4 is a schematic illustration of the connection of the warp yarns to the weft yarns for each set of three of the tubular interwoven segments;

FIG. 5 is a schematic illustration of the tubular interweaving segments with four warp yarns in each set connected to weft yarns;

FIG. 6 is a schematic illustration of the formation of side aperture weft yarns with different warp yarn winding patterns;

FIG. 7 is a schematic view of an apparatus for weaving the end closure segments, tubular plain weave segments and intermediate segments of a tubular body of the present utility model;

FIG. 8 is a schematic view of the weft yarn of FIG. 7 wrapped with different warp yarns;

FIG. 9 is a schematic representation of an apparatus for braiding a tubular interleaving section of a tubular body of the present utility model;

FIG. 10 is a schematic view of an apparatus for weaving the end closure segments, tubular plain sections and intermediate sections of the tubular body double layer structure of the present utility model;

FIG. 11 is a schematic illustration of the winding pattern of the weft yarn of FIG. 10 with two different warp yarns;

FIG. 12 is a schematic representation of an apparatus for braiding a tubular interweaving segment of a tubular body bilayer structure of the present utility model;

fig. 13 is a front view of a second embodiment of the present utility model in an expanded state.

Detailed Description

The utility model will be described in further detail with reference to the drawings and the detailed description.

In the first embodiment, as shown in fig. 1 to 3, a tubular stent for reconstructing a knee ligament is formed by weaving warp yarns 10 and weft yarns 20, and is a tubular body 100 after being unfolded, and the minimum inner diameter D of the tubular body 100 may be Φ8mm_12mm. It is further preferred that the minimum inner diameter D of the tubular body 100 is Φ10mm;

the tubular body 100 comprises two end closing-in sections 1 and an intermediate section 2, each end closing-in section 1 and the intermediate section 2 are connected through a tubular plain weave section 3 and a tubular interweaving section 4, one end of the tubular plain weave section 3 is connected with the end closing-in section 1, the other end is connected with one end of the tubular interweaving section 4, and the other end of the tubular interweaving section 4 is connected with one end of the intermediate section 2.

The end closing-in section 1 comprises a weft yarn 20 and a plurality of warp yarns 10 which are distributed at intervals along the axial direction of the tubular body 100, wherein the weft yarn 20 moves spirally along the circumferential direction of the tubular body 100 and is interwoven with the plurality of warp yarns 10.

The tubular plain weave section 3 comprises a plurality of warp yarns 10 extending from the end closing-up section 1 and weft yarns 20 continuously spirally moving along the circumferential direction of the tubular body 100 and being crossly woven with the plurality of warp yarns 10; the spacing between the adjacent warp yarns 10 of the end closing-up section 1 is the same as the spacing between the adjacent warp yarns 10 of the tubular plain section 3, and the thread pitch formed by weaving the weft yarns 20 of the tubular plain section 3 is 2-5 times of the thread pitch formed by weaving the weft yarns 20 of the end closing-up section 1; in this embodiment, the spacing between the adjacent warp yarns 10 of the end closing-up section 1 and the spacing between the adjacent warp yarns 10 of the tubular plain section 3 are preferably 1-3mm, and more preferably 2mm; the weft yarn 20 of the end closing-in section 1 is woven to form a thread pitch of 1mm, and the thread pitch of the weft yarn 20 of the tubular plain section 3 is woven to form 3mm.

The tubular interweaving section 4 comprises 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 consists of adjacent plurality of warp yarns 10, each group of warp yarns 10 are mutually wound, the weft yarns 20 extend out from the tubular plain section 3 to continuously spirally move along the circumferential direction of the tubular body 100 and weave through each group of warp yarns 10 mutually wound, the center-to-center spacing of each group of warp yarns 10 is 2-5 times of the spacing between the adjacent warp yarns 10 of the tubular plain section 3, and the pitch formed by weaving the weft yarns 20 of the tubular interweaving section 4 is 1-2 times of the pitch formed by weaving the weft yarns 20 of the tubular plain section 3; each group of warp yarns 10 in this embodiment consists of two adjacent warp yarns 10, as shown in fig. 3, with weft yarns 20 passing between two wrap warp yarns 10; the tubular interweaving segments 4 are woven with weft yarns 20 having a pitch of 4mm.

When three warp yarns 10 are used in each group, as shown in fig. 4, one warp yarn 10 is wound around the other two non-crossing warp yarns 10, and the weft yarn 20 passes between the one winding warp yarn 10 and the other two non-crossing warp yarns 10;

when there are four warp yarns 10 in each group, as shown in fig. 5, two warp yarns 10 are wrapped around and the other two non-crossing warp yarns 10, and the weft yarn 20 passes between the two wrap warp yarns 10 and the other two non-crossing warp yarns 10.

The middle section 2 comprises a plurality of groups of warp yarns 10 extending from the tubular interweaving section 4, the plurality of groups of warp yarns 10 are separated to form a plurality of warp yarns 10 which are distributed identically to the tubular plain section 3, the weft yarns 20 extend out from the tubular interweaving section 4 to continuously spirally move along the circumference of the tubular body 100 and are interwoven with the plurality of warp yarns 10, the spacing between the adjacent warp yarns 10 on the middle section 2 is identical to the spacing between the adjacent warp yarns 10 on the tubular plain section 3, the pitch formed by braiding the weft yarns 20 on the middle section 2 is identical to the pitch formed by braiding the weft yarns 20 on the tubular plain section 3, and particularly, the spacing between the adjacent warp yarns 10 on the middle section 2 is preferably 2mm; the weft yarn 20 on the intermediate section 2 is woven to form a pitch of 3mm.

The tubular interweaving section 4, the tubular plain weave section 3 and the end closing section 1 on the other side of the middle section 2 are formed by reversely knitting a plurality of warp yarns 10 and a weft yarn 20 according to the knitting structures of the sections.

The middle of the tubular plain weave section 3 is provided with a sparse section 5, the sparse section 5 is continuously extended by a set distance from a plurality of warp yarns 10, then the weft yarns 20 stop moving and weaving within the set distance from the continuous extension of the warp yarns 10, and the weft yarns 20 continue to weave according to the original moving mode after jumping to the position after the warp yarns 10 extend in place.

The middle of the middle section 2 is provided with a sparse section 5, the sparse section 5 is continuously extended by a set distance from a plurality of warp yarns 10, then the weft yarns 20 stop moving and weaving within the set distance from the continuous extension of the warp yarns 10, and the weft yarns 20 continue to weave according to the original moving mode after jumping to the position after the warp yarns 10 extend in place.

The middle part of each tubular plain weave section 3 is provided with a side opening 31, the side opening 31 is formed by weaving the weft yarn 20 which reaches the side edge warp yarn 10 on the side opening 31 by reverse movement around the warp yarn 10 to the side edge warp yarn 10 under the side opening 31, and then reverse movement weaving is performed until the side opening 31 is woven to form the weft yarn 20, and then weaving is continued along the original spiral direction, as shown in fig. 6. The side opening 31 can be used as a tendon implantation port, and the tendon can be led from the side opening 31 on one side to be pulled to the middle section 2 by using a pulling wire, so that the tubular support and the tendon are combined and fixed to effectively improve the overall strength.

The periphery of the side opening 31 is woven with a circle of edge yarns 32 of a different color from the warp yarns 10 and the weft yarns 20, and the edge yarns 32 are woven in connection with the weft yarns 20. If the warp yarns 10 and the weft yarns 20 are white threads, the edge yarns 32 may be yellow threads or green threads. The design of different colors is favorable for observation and identification under an arthroscope, and is convenient for doctors to operate accurately.

The end closing-in section 1, the tubular plain section 3 and the intermediate section 2 of this embodiment can be woven using the device shown in fig. 7, the warp yarn 10 being released from the creel 1a and woven through the two heald frames 2a, the heald buckles 3a, at the loom shaft 4a with the weft yarn 20 driven by the shuttle 5a and then being taken up in the take-up reel 6a. The weft yarn 20 is wound around the different warp yarns 10 during the weaving process as shown in figure 8.

The tubular interweaving section 4 can be woven by adopting the device shown in fig. 9, on the basis of the device shown in fig. 7, two doup heald frames 7a are additionally arranged between the two heald frames 2a and the heald buckles 3a, the doup heald frames 7a wind a plurality of groups of warp yarns 10, then pass through the heald buckles 3a to reach the position of the loom beam 4a to be woven with the weft yarns 20 driven by the shuttles 5a, and the woven warp yarns are collected on the winding shaft 6a.

When the embodiment is used, the autograft is put in the middle of the tubular body 100, and then the autograft is fixed on the tibia and the femur respectively through two end closing sections 1 and two ends of the autograft by steel nails, and one tubular plain section 3 is positioned at the tunnel section of the tibia end bone.

Another modification of this embodiment is: the warp yarns 10 of the end closing-in section 1, the tubular plain weave section 3, the tubular interweaving section 4 and the middle section 2 are of double-layer structures, the weft yarns 20 are woven with the upper warp yarns 10 for one layer according to a spiral motion mode, then woven with the lower warp yarns 10, then woven with the upper warp yarns 10, and the weft yarns 20 are woven with the upper warp yarns 10 in a crossing manner to form the section structures.

The end closing-in section 1, the tubular plain section 3 and the middle section 2 of the double-layer structure can be woven by adopting a device shown in fig. 10, warp yarns 10 are released from a creel 1a, form two layers through four heald frames 2a and heald buckles 3a, are woven with weft yarns 20 driven by a shuttle 5a at a loom beam 4a, and are finally collected in a collecting shaft 6a. The weft yarn 20 is wound around two different warp yarns 10 in the weaving process in the manner shown in figure 11.

The tubular interweaving section 4 with the double-layer structure can be woven by adopting a device shown in fig. 12, two doup heddle frames 7a are additionally arranged between four heddle frames 2a and a heddle button 3a on the basis of the device shown in fig. 10, the doup heddle frames 7a wind multiple groups of warp yarns 10 with double layers, then pass through the heddle button 3a to reach a loom beam 4a to be woven with weft yarns 20 driven by a shuttle 5a, and the woven warp yarns are collected in a collecting shaft 6a.

The warp yarn 10 and the weft yarn 20 of this embodiment may be made of one or a combination of two or more of ultra-high molecular weight polyethylene fibers, polyethylene terephthalate fibers and polypropylene fibers.

The cutting mode of the warp yarns 10 of the end closing section 1 can use a heating and melting mode for closing, and is characterized in that after the fibers are heated and melted, loosening and cracking can be prevented.

It should be noted that, the spiral movement of the weft yarn 20 along the circumferential direction of the tubular body 100 and the cross weaving with the plurality of warp yarns 20 defined by the present utility model are described in the case where the tubular stent is deployed into the tubular body, whereas in the actual weaving, the weft yarn 20 moves following the shuttle 5a, and the shuttle 5a shuttles according to the positions of the warp yarns 20, which does not require the actual spiral movement.

The tubular stent woven by the embodiment is cleaned and dried, and then collagen coating is added on the inner and outer surfaces of the tubular stent. The method comprises the steps of soaking a braided tubular stent in acetone or ethanol or isopropanol solution, starting ultrasonic cleaning, and then rinsing with purified water; drying the cleaned tubular stent in an environment of 60-80 ℃; and then the dried tubular stent is subjected to plasma treatment, and then the tubular stent is put into a collagen solution for soaking for a set time (for example, the soaking time can be set to be 1-2 hours), and then the tubular stent with the collagen coating on the inner surface and the outer surface is formed by taking out and vacuum drying. So that the bone marrow cells are proliferated and the healing of the bone graft is effectively promoted after the tubular stent is used.

In a second embodiment, as shown in fig. 13, a tubular stent for reconstructing knee joint ligaments is different from the first embodiment in that a plurality of sparse segments 5 are further arranged on the middle segment 2.

While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. A tubular stent for knee ligament reconstruction, formed by braiding warp and weft, which is a tubular body after deployment, characterized in that: the tubular plain weave section comprises two end closing-in sections and a middle section, wherein each end closing-in section and the middle section are connected through a tubular plain weave section and a tubular interweaving section, one end of the tubular plain weave section is connected with the end closing-in section, the other end of the tubular plain weave section is connected with one end of the tubular interweaving section, and the other end of the tubular interweaving section is connected with one end of the middle section;

2. A tubular scaffold for knee ligament reconstruction according to claim 1, characterised in that: the middle of the tubular plain weave section is provided with a sparse section, the sparse section is formed by continuously extending a set distance from a plurality of warp yarns, then weft yarns stop moving and weaving within the set distance from the continuously extending warp yarns, and the weft yarns continue to weave according to the original moving mode after the weft yarns jump to the position after the warp yarns extend in place.

3. A tubular scaffold for knee ligament reconstruction according to claim 1, characterised in that: the middle of the middle section is provided with a sparse section, the sparse section is formed by continuously extending a set distance from a plurality of warp yarns, then weft yarns stop moving and weaving within the set distance from the continuously extending warp yarns until the weft yarns jump to the position after the warp yarns extend in place, and then the weft yarns continue to weave according to the original moving mode.

4. A tubular scaffold for knee ligament reconstruction according to claim 1, characterised in that: the minimum inner diameter of the tubular body is phi 8mm-12mm.

5. A tubular scaffold for knee ligament reconstruction according to claim 1, characterised in that: the distance between the adjacent warp yarns of the end closing-up section, the distance between the adjacent warp yarns of the tubular plain weave section and the distance between the adjacent warp yarns of the middle section are all 1-3mm; the center-to-center spacing between every two adjacent groups of warp yarns of the tubular interweaving sections is 2mm-6mm.

6. A tubular scaffold for knee ligament reconstruction according to claim 1, characterised in that: the weft yarn of the end closing-in section is woven to form a thread pitch of 0.5mm-1mm; the thread pitch formed by weaving the tubular plain weave section weft yarns is 1mm-5mm; the thread pitch formed by braiding the weft yarns of the tubular interweaving sections is 2mm-8mm; the pitch of the weft yarn at the middle section is 1mm-5mm.

7. A tubular scaffold for knee ligament reconstruction according to claim 1, characterised in that: the warp yarns of the end closing-in section, the tubular plain weave section, the tubular interweaving section and the middle section are of double-layer structures, the weft yarns are woven with the upper layer warp yarns for one layer according to a spiral motion mode, then woven with the lower layer warp yarns, and then woven with the upper layer warp yarns, and the weft yarns are woven with the upper layer warp yarns and the lower layer warp yarns in a crossed mode to form the structures of the sections.

8. A tubular scaffold for knee ligament reconstruction according to claim 1, characterised in that: in the tubular interweaving section, each group of warp yarns is two, three or four; when each group of warp yarns is two, weft yarns pass through the space between two winding warp yarns, and when each group of warp yarns is three, one warp yarn is wound with the other two non-crossing warp yarns, and weft yarns pass through the space between one winding warp yarn and the other two non-crossing warp yarns; when each group of warp yarns is four, two warp yarns are wound and wound with the other two non-crossing warp yarns, and the weft yarns pass through between the two winding warp yarns and the other two non-crossing warp yarns.

9. A tubular scaffold for knee ligament reconstruction according to claim 1, characterised in that: the middle part of each tubular plain weave section is provided with a side opening, the side opening is formed by weaving weft yarns which reach the upper side edge warp yarn of the side opening through reverse movement of the weft yarns around the warp yarns to the lower side edge warp yarn of the side opening and then reverse movement of the weft yarns until the weft yarns formed by weaving the side opening continue to weave along the original spiral direction.

10. A tubular scaffold for knee ligament reconstruction according to claim 9, characterised in that: and weaving a circle of edge yarns with different colors from the warp yarns and the weft yarns around the side open holes, wherein the edge yarns are connected with the weft yarns for weaving.

11. A tubular scaffold for the reconstruction of knee ligaments according to any one of claims 1 to 10, wherein: and (3) cleaning and drying the braided tubular stent, and then adding collagen coating on the inner and outer surfaces of the tubular stent.

12. A tubular scaffold for knee ligament reconstruction according to claim 11, wherein: the cleaning is to soak the braided tubular stent in acetone or ethanol or isopropanol solution, start ultrasonic cleaning, and then rinse with purified water; drying the cleaned tubular stent in an environment of 60-80 ℃; and then carrying out plasma treatment on the dried tubular stent, then putting the tubular stent into a collagen solution for soaking for a set time, taking out, and then carrying out vacuum drying to form the tubular stent with the collagen coating on the inner surface and the outer surface.