Weft yarn for artificial ligament, weft yarn preparation method, and artificial ligament

Abstract

A weft yarn for an artificial ligament (1), a weft yarn preparation method, and an artificial ligament (1). The artificial ligament (1) is of a round rod structure; a first woven part (102), an in-joint free filament part (103), and a second woven part (104) which are sequentially connected are formed in the round rod structure in the axial direction thereof; the in-joint free filament part (103) comprises a plurality of weft yarns (201), and the weft yarns (201) extend in the axial direction of the round rod structure; and each weft yarn (201) has a fineness of 1000 D-3000 D / 1-100 F, and a mechanical strength of 75-300 N. By increasing the mechanical strength of a single yarn formed in the in-joint free filament part (103) of the artificial ligament (1), the number of yarns in the in-joint free filament part (103) is decreased. The present invention can eliminate a knee joint synovial membrane inflammatory response caused by chippings of the artificial ligament (1) in the reconstruction process of the artificial ligament (1), reduce the degree of contact adhesion between the in-joint free filament part (103) and the tissue, reduce the probability of adhesion, and solve the clinical problems of the inflammatory response and the prolonged surgery time which are caused by difficult removal due to adhesion of the free filaments and the tissue in the revision surgery.

Description

A weft yarn for artificial ligaments and its preparation method; artificial ligaments Technical Field

[0001] This invention belongs to the field of medical device technology, and particularly relates to a weft yarn for artificial ligaments, its preparation method, and artificial ligaments. Background Technology

[0002] With the increasing number of patients undergoing arthroscopic anterior cruciate ligament (ACL) reconstruction, the number of patients requiring ACL reconstruction and revision surgery due to various factors has also increased. Primary reconstruction mainly results from ACL failure, primarily manifesting as joint instability, and is also the main indication for revision surgery. The LARS artificial ligament, as a graft, offers dual advantages in both ACL and posterior cruciate ligament reconstruction and repair. The LARS artificial ligament mainly consists of three parts: a traction suture, a braided portion, and a free fiber portion. The free fiber portion is implanted within the joint cavity, functioning as a ligament.

[0003] During the initial repair of artificial ligaments, the following situations may occur: ① After artificial ligament transplantation, the wear and tear debris can cause synovial reaction in the knee joint: Commercially available artificial ligament products are mainly made of polyethylene terephthalate (PET). When artificial ligaments made of PET are twisted, the presence of transverse fibers may generate free particles, especially at the edges of the bone tunnel, where friction between the ligament and the bone tunnel is more severe. This leads to a large amount of debris from the ligament material, resulting in synovitis. The LARS Patient Handbook reports that in 159 patients with ligament rupture, one-third developed synovitis symptoms within 3-5 years; ② During subsequent revision surgery, the original implanted artificial ligament is removed. During this process, free fibers can adhere to the tissue, prolonging the operation time. Incomplete removal can also trigger an inflammatory reaction.

[0004] Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a weft yarn for artificial ligaments, a method for preparing the same, and an artificial ligament. By improving the mechanical strength and fineness of the single yarn in the free filament portion of the artificial ligament within the joint, the number of yarns in the free filament portion within the joint is reduced. This not only solves the problem of knee joint synovitis caused by the artificial ligament and debris during artificial ligament reconstruction, but also reduces the degree of adhesion between the free filament portion and tissue, thus reducing the probability of adhesion. This addresses the clinical problems of inflammatory reactions and prolonged operation time caused by the difficulty in removing adhesions between free filaments and tissue during revision surgery.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A weft yarn for an artificial ligament, wherein the artificial ligament has a cylindrical bar structure, and the cylindrical bar structure forms a first braided section, an intra-articular free yarn section and a second braided section connected sequentially along the axial direction, wherein the intra-articular free yarn section includes multiple weft yarns, and the weft yarns extend along the axial direction of the cylindrical bar structure;

[0008] The fineness of the weft yarn is 1000D-3000D / 1-100F, and the mechanical strength of the weft yarn is 75-300N.

[0009] In a preferred embodiment of the present invention, the weft yarn is a filament directly formed and shaped through melt spinning or solvent spinning processes; and / or

[0010] The weft yarn is a ply yarn formed by twisting and plying monofilaments / multifilaments; and / or

[0011] The weft yarn is a round or flat yarn formed by twisting and weaving monofilaments / multifilaments.

[0012] In a preferred embodiment of the present invention, the weft yarn includes a first weft yarn and a second weft yarn, wherein the first weft yarn is made of a non-degradable material and the second weft yarn is made of a degradable material.

[0013] In a preferred embodiment of the present invention, the first weft yarn is made of PET with a molecular weight of 20,000-30,000D.

[0014] The method for preparing the weft yarn for artificial ligaments as described in the above embodiments includes the following steps:

[0015] S1: Filaments of a fineness range directly formed through melt spinning or solvent spinning processes; and / or

[0016] The monofilament / multifilament yarns are twisted in the S / Z direction to a twist of 200-1000 TPM. The twisted monofilament / multifilament yarns are then plyed in the S / Z direction to a ply twist of 0.8-1.0 times the twist of the monofilament / multifilament yarns; and / or

[0017] The monofilament / multifilament yarns are twisted in the S / Z direction with a twist of 200-500 TPM. The twisted monofilament / multifilament yarns are then braided into round or flat yarns using a braiding machine with a braiding density of 1-100 plies / inch.

[0018] S2: Shaping treatment; specifically, it can be any one of the following: wet shaping, hot air shaping, or stretching shaping, but is not limited to this.

[0019] S3: Pre-treat under preset temperature and humidity to obtain weft yarn that forms the free filament part inside the joint.

[0020] Preferably, the plying includes: S-direction twisting of monofilament / multifilament yarns followed by Z-direction plying; and Z-direction twisting of monofilament / multifilament yarns followed by S-direction plying.

[0021] An artificial ligament is provided, wherein the artificial ligament is a cylindrical bar structure, and the cylindrical bar structure forms a first braided section, an intra-articular free yarn section and a second braided section connected sequentially along the axial direction. The intra-articular free yarn section includes multiple weft yarns for artificial ligaments as described in the above embodiments. The first braided section and the second braided section are both woven from weft yarns and other yarns.

[0022] Preferably, the weft yarn includes a first yarn and a second yarn, wherein the first weft yarn is made of a non-degradable material and the second weft yarn is made of a degradable material, and the ratio of the number of the first weft yarn to the number of the second weft yarn is 2:1 to 5:1.

[0023] Preferably, the second weft yarn is located radially outside the round bar structure relative to the first weft yarn.

[0024] Preferably, the first and second braided sections are made of fabric pieces interwoven with weft yarns, warp yarns, and chain braiding yarns, sewn together. The warp yarns and chain braiding yarns extend along the width direction of the fabric piece, and the length direction of the fabric piece is parallel to the axial direction of the round bar structure.

[0025] Because the present invention adopts the above technical solution, it has the following advantages and positive effects compared with the prior art:

[0026] (1) The weft yarn for artificial ligaments is used in the free filament part of the artificial ligament joint. The free filament part of the joint includes multiple weft yarns. The fineness of a single weft yarn provided by the present invention is in the range of 1000D-3000D / 1-100F, and the mechanical strength is in the range of 75-300N. Therefore, the mechanical strength of a single weft yarn is enhanced, thereby reducing the debris generated after wear of the free filament part of the joint, and thus avoiding the occurrence of synovial reaction of the knee joint. At the same time, due to the enhanced mechanical strength and fineness of a single weft yarn, the number of weft yarns in the free filament part of the joint is reduced. Moreover, due to the increased fineness of a single weft yarn, the outer surface area of ​​a single weft yarn in the same type of artificial ligament is increased. On the one hand, it can reduce the degree of adhesion between the weft yarn and the tissue, thereby facilitating the separation of the weft yarn from the tissue during revision surgery and reducing the revision surgery time. On the other hand, it also reduces the probability of adhesion to the tissue (because the weft yarn is thicker, the mechanical strength is increased, a single weft yarn is not easy to break, and the number of weft yarns used is reduced, so the degree of adhesion and the probability of adhesion are reduced). Therefore, this invention not only solves the problem of synovial inflammation caused by artificial ligaments and debris during knee joint reconstruction, but also solves the clinical problems of inflammation caused by the difficulty in removing free wires and tissue adhesions during revision surgery and the prolongation of operation time. Attached Figure Description

[0027] Figure 1 is a schematic diagram of the artificial ligaments in Embodiments 1 and 3 of the present invention;

[0028] Figure 2 is a schematic diagram of the artificial ligament fabric padding yarn in Embodiments 1 and 3 of the present invention;

[0029] Figure 3 is a schematic diagram of the artificial ligament fabric pieces in Embodiments 1 and 3 of the present invention.

[0030] Figure 4 is a schematic diagram of the cross-section of the twisted strand in Embodiment 1 of the present invention;

[0031] Figure 5 is a schematic diagram of the cross-section of the circular braided yarn after braiding in Embodiment 1 of the present invention.

[0032] Explanation of reference numerals in the attached drawings: 1-artificial ligament; 101-first traction line; 102-first braided section; 103-intra-articular free yarn section; 104-second braided section; 105-second traction line; 2-fabric piece; 201-weft yarn; 202-variant warp yarn; 203-chain yarn. Detailed Implementation

[0033] Currently, the following situations exist during the initial repair of artificial ligaments: ① After artificial ligament transplantation, synovial reactions in the knee joint can occur due to wear and tear debris: Free filaments within the joint capsule rub against the tissue, and individual filaments, with their low strength, are prone to breakage, producing debris and leading to an inflammatory response. Furthermore, PET-induced debris synovitis has a high incidence rate, caused by macrophage infiltration and cytokines released by pathological synovial cells, resulting in acute and chronic synovitis; ② The original implanted artificial ligament needs to be removed and a new ligament implanted. During the removal process, free filaments can adhere to the tissue, prolonging the operation time, and incomplete removal can further trigger an inflammatory response.

[0034] Therefore, this invention provides a novel weft yarn for artificial ligaments, which can be used in knee joint artificial ligament reconstruction and revision surgery to alleviate patients' pain, improve the mechanical strength and fineness of a single weft yarn, reduce debris after the free filaments are worn with the tissue, and reduce the number of weft yarns used. This can reduce the degree of contact and adhesion between the free filaments and the tissue, and also reduce the probability of adhesion.

[0035] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a weft yarn for artificial ligaments, a method for preparing the same, and the artificial ligament itself. The advantages and features of the present invention will become clearer from the following description.

[0036] In this specification, identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface" and "top surface," "inner" and "outer" refer to directions towards or away from a specific component, respectively. 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0037] Example 1

[0038] A weft yarn for an artificial ligament, wherein, as shown in FIG1, the artificial ligament 1 is a cylindrical bar structure, and the cylindrical bar structure forms a first braided part 102, an intra-articular free yarn part 103 and a second braided part 104 connected sequentially along the axial direction. The intra-articular free yarn part 103 includes multiple weft yarns 201, and the weft yarns 201 extend along the axial direction of the cylindrical bar structure.

[0039] The fineness of weft yarn 201 is 1000D-3000D / 1-100F, and the mechanical strength of weft yarn 201 is 75-300N, such as 75, 80, 85, 100, 150, 200, 250, 300N, etc.

[0040] In this embodiment, the fineness of a single weft yarn 201 is designed to be 1000D-3000D / 1-100F, and the mechanical strength of the weft yarn 201 is in the range of 75-300N. Using the weft yarn 201 of this embodiment, the free filament part 103 within the joint can achieve the strength of the artificial ligament 1 with only 100 inner weft yarns 201. Compared with the existing artificial ligament 1 which has 300 weft yarns 201, the number of weft yarns 201 is greatly reduced. Reducing the number of weft yarns 201 can, on the one hand, reduce the degree of adhesion between the weft yarn 201 and the tissue, thereby facilitating the separation of the weft yarn 201 from the tissue during revision surgery and reducing the revision surgery time; on the other hand, it also reduces the probability of adhesion to the tissue (if there are many adhered weft yarns, it is time-consuming to remove them one by one. With fewer weft yarns and higher mechanical strength, adhesion to the tissue is less likely to occur). It increases the mechanical strength of a single weft yarn 201 and reduces debris generated after wear of the free yarn portion 103 within the joint, thereby avoiding synovial reaction in the knee joint.

[0041] Furthermore, the mechanical strength of the single weft yarn 201 is enhanced from its structural aspects.

[0042] In one embodiment, the weft yarn 201 is a filament that is directly formed and shaped through melt spinning or solvent spinning processes.

[0043] In another embodiment, the fiber filaments are twisted. If one end of the sliver is held and the other end is rotated, yarn can be formed. This process is called twisting. The weft yarn 201 is a ply yarn formed by twisting and plying monofilaments / multifilaments, as shown in Figure 4. Using this twisting embodiment, a tight structure that is not easily damaged by lateral external forces can be formed, and twisting can also increase the strength and elasticity of the weft yarn 201.

[0044] In another embodiment, the weft yarn 201 is a round or flat yarn formed by twisting and weaving monofilaments / multifilaments. In this embodiment, after twisting to further increase strength, the twisted monofilaments / multifilaments are then woven into round or flat yarns, such as the circular braided yarn shown in Figure 5, to further increase the strength of a single weft yarn 201.

[0045] The current artificial ligament 1 also has poor biocompatibility. Under the influence of various factors, it can lead to knee instability, chronic pain, and low overall patient satisfaction with the knee joint. Therefore, in some embodiments, the weft yarn 201 includes a first weft yarn 201 and a second weft yarn 201. The first weft yarn 201 is made of a non-degradable material, such as PLLA, PLGA, or collagen; the second weft yarn 201 is made of a degradable material, such as PET, UHMWPE, or other materials with good biocompatibility.

[0046] Artificial ligament 1 is made by mixing a first weft yarn of a non-degradable material with a second weft yarn of a biodegradable material. As the biodegradable fibers degrade, they guide tissue cells to grow into the ligament and provide space for ingrowth. The scaffold provided by artificial ligament 1 allows tissue cells to adhere, proliferate, and differentiate. The formation of a biofilm attached to artificial ligament 1 reduces the "windshield wiper effect." Furthermore, the reduction in wear particles lowers the incidence of synovitis. The reduced wear of artificial ligament 1 within the joint slows down the degradation and degeneration of the non-degradable portion of artificial ligament 1, preventing permanent elongation or rupture. This fully utilizes the strong mechanical value of artificial ligament 1, enabling it to achieve a symbiotic relationship with the autologous tendon.

[0047] Preferably, the first weft yarn is made of PET with a molecular weight of 20,000-30,000D, such as 20,000, 25,000, 30,000, etc. The non-degradable first weft yarn made of PET with this molecular weight range has better mechanical properties. The weft yarn made of this material also enhances the strength and toughness of a single weft yarn 201.

[0048] Example 2

[0049] The method for preparing the weft yarn 201 for the artificial ligament 1 includes the following steps:

[0050] S1: Filaments of a fineness range directly formed through melt spinning or solvent spinning processes;

[0051] S2: Shaping treatment; specifically, it can be any one of the following: wet shaping, hot air shaping, or stretching shaping, but is not limited to these;

[0052] S3: Pre-treat the chemical fiber filaments under preset temperature and humidity to obtain the weft yarn 201 that forms the free filament part 103 within the joint.

[0053] In some embodiments, the preparation method may also include:

[0054] S1: Twist the monofilament / multifilament yarn in the S / Z direction with a twist of 200-1000 TPM; if the twist is too small, the cohesion will be insufficient and the yarn will be loose; if the twist is too large, the yarn will be too stiff and easy to knot, which is not conducive to weaving and will also result in a loss of strength.

[0055] S2: The twisted monofilament / multifilament yarns are plyed in the S / Z direction. It is preferable that the monofilament / multifilament yarns are twisted in the S direction and then plyed in the Z direction; the monofilament / multifilament yarns are twisted in the Z direction and then plyed in the S direction. The twist of the ply is 0.8-1.0 times the twist of the monofilament / multifilament yarns. If the twist is too small, the cohesion is insufficient and the yarn is loose. If the twist is too large, the yarn is too stiff and easy to knot, which is not conducive to weaving and also results in a loss of strength.

[0056] S3: Shaping treatment; specifically, it can be any one of the following: wet shaping, hot air shaping, or stretching shaping, but is not limited to this;

[0057] S4: Pre-treat the twisted yarn under preset temperature and humidity to obtain the weft yarn 201 that forms the free filament part 103 in the joint.

[0058] In this embodiment, twisting and plying can enhance the strength of the weft yarn, while also allowing the yarns to bind together, which is beneficial for weaving and shaping. By controlling the twist within the required range, the mechanical strength of the yarn can reach 75-300N.

[0059] In some other embodiments, the preparation method may also include:

[0060] S1: Twist the monofilament / multifilament yarn in the S / Z direction with a twist of 200-500 TPM. If the twist is too small, the cohesion will be insufficient and the yarn will be loose. If the twist is too large, the yarn will be too stiff and easy to knot, which is not conducive to weaving and will also result in a loss of strength.

[0061] S2: The twisted monofilament / multifilament is braided into round or flat yarn using a braiding machine, with a braiding density of 1-100 strands / inch; if the braiding density is too low, the braided rope will be loose, and if the braiding density is too high, the yarn will be too stiff, resulting in a loss of strength.

[0062] S3: Shaping treatment; specifically, it can be any one of the following: wet shaping, hot air shaping, or stretching shaping, but is not limited to this;

[0063] S4: Pre-treat the woven yarn under preset temperature and humidity to obtain weft yarn 201 that forms the free filament part 103 inside the joint.

[0064] In this embodiment, twisting can enhance the mechanical strength of the yarn, and further weaving increases the mechanical strength of the weft yarn. The twist and weaving density are controlled within the required range, so that the mechanical strength of the weft yarn reaches 75-300N.

[0065] Example 3

[0066] Referring to Figures 1 and 3, an artificial ligament 1 is provided. The artificial ligament 1 has a cylindrical structure, which is formed by rolling and sewing a fabric sheet 2. The fabric sheet 2 includes weft yarns 201 and warp yarns. The warp yarns extend along the width of the fabric sheet 2, and the weft yarns 201 extend along the length of the fabric sheet 2. The cylindrical structure forms a first braided section 102, an intra-articular free yarn section 103, and a second braided section 104 connected sequentially along its length. The end of the first braided section 102 is pulled by a first traction line 101, and the end of the second braided section 104 is pulled by a second traction line 105. The artificial ligament 1 provides traction during implantation. The intra-articular free yarn section 103 includes multiple weft yarns 201 for the artificial ligament 1 as in Example 1. Both the first braided section 102 and the second braided section 104 are woven from the weft yarns 201 and warp yarns of the artificial ligament 1 in Example 1.

[0067] The multiple weft yarns 201 that make up the free filament section 103 within the joint can be mixed with the chemical fiber filaments directly obtained by melt spinning and solvent spinning in Example 1, the twisted ply yarn, and the twisted and woven braided yarn. One or more of the three different structures of weft yarns 201 can be selected in any mixing ratio to form the free filament section 103 within the joint. For example, the twisted ply yarn and the twisted and woven braided yarn can be mixed in a ratio of 1:2 to form the free filament section 103 within the joint.

[0068] In other preferred embodiments, the weft yarn of the intra-articular free filament may be made of degradable and non-degradable materials. That is, the weft yarn 201 includes a first yarn and a second yarn, wherein the first weft yarn is made of a non-degradable material and the second weft yarn is made of a degradable material. When forming the intra-articular free filament portion 103, the ratio of the first weft yarn to the second weft yarn is preferably 2:1 to 5:1, and more preferably 5:1. This can degrade the ligament surface to form pores, which is conducive to cell attachment.

[0069] Preferably, the second weft yarn is located on the radial outer side of the round bar structure relative to the first weft yarn. The second weft yarn of the biodegradable material is set on the radial outer side of the artificial ligament 1. As the biodegradable fiber degrades, tissue cells directly adhere, proliferate, and differentiate on the outer surface of the artificial ligament 1, forming a biofilm on the outer surface of the artificial ligament 1. As the membrane thickens, it can compensate for the mechanical properties of the artificial ligament on the one hand, and gradually replace the artificial ligament on the other hand.

[0070] Referring to Figures 2-3, in some embodiments, the first weaving section 102 and the second weaving section 104 are sewn together from fabric pieces 2 formed by different variations of weft yarn 201, warp yarn, and chain yarn. The warp yarn and chain yarn extend along the width direction of the fabric piece 2, and the length direction of the fabric piece 2 is parallel to the axis of the cylindrical structure. The fabric piece 2 constituting the artificial ligament 1 is composed of three yarns: weft yarn 201, varied warp yarn, and chain yarn. The fabric structure is formed by different variations of the three yarns: weft yarn 201, varied warp yarn, and chain yarn. Weft yarn 101 can have different variations such as 1-through-1-open, 2-through-1-open, 3-through-1-open, and 3-through-2-open. The varied warp yarn can be a varied warp plain weave, a warp pile weave, etc. The chain yarn can be a chain weave, etc. The fabric piece 2 is formed by the interweaving of the three yarns: weft yarn 201, varied warp yarn, and chain yarn. The fabric piece 2 is formed by symmetrically distributing the three yarns along the middle weft yarn 201, thus forming the artificial ligament 1 fabric piece 2 as shown in Figure 3.

[0071] Example 4

[0072] The first weft yarn is made of PET with a molecular weight of 30,000D, and the commonly used PET yarn is used as the material for the warp yarn and the chain yarn. The fabric piece 2 shown in Figure 3 is woven on a loom, and then wound and sewn to form the artificial ligament 1 shown in Figure 1. That is, in this embodiment, the weft yarn 201 of the artificial ligament 1 is all made of non-degradable material. The structure of a single first weft yarn can be any one of the following: melt spinning, solvent spinning directly obtained chemical fiber filament, twisted ply yarn, and twisted and woven braided yarn. When the number of single filaments or ply yarns of the weft yarn 201 in the free filament part 103 inside the joint is 200-400, the mechanical strength of the artificial ligament 1 can reach 8000-9000N.

[0073] Currently, a certain brand of artificial ligament 1 circulating on the market has 2000-4000 weft yarns 201 in the free filament part 103 inside the joint, and the mechanical strength of this artificial ligament 1 is 4000-6000N.

[0074] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A weft yarn for an artificial ligament, wherein the artificial ligament has a cylindrical structure, the cylindrical structure having a first braided section, an intra-articular free yarn section, and a second braided section sequentially connected along the axial direction, characterized in that, The free filament portion within the joint includes multiple weft yarns, which extend along the axial direction of the round bar structure; The fineness of the weft yarn is 1000D-3000D / 1-100F, and the mechanical strength of the weft yarn is 75-300N.

2. The weft yarn for artificial ligaments according to claim 1, characterized in that, The weft yarn is a filament directly produced and shaped using chemical fiber spinning technology; and / or The weft yarn is a ply yarn formed by twisting and plying monofilaments / multifilaments; and / or The weft yarn is a round or flat yarn formed by twisting and weaving monofilaments / multifilaments.

3. The weft yarn for artificial ligaments according to claim 1, characterized in that, The weft yarn includes a first weft yarn and a second weft yarn, wherein the first weft yarn is made of a non-degradable material and the second weft yarn is made of a degradable material.

4. The weft yarn for artificial ligaments according to claim 3, characterized in that, The first weft yarn is made of PET with a molecular weight of 20,000-30,000D.

5. The method for preparing the weft yarn for artificial ligaments as described in any one of claims 1-4, characterized in that, Includes the following steps: S1: Filaments of a fineness range directly formed through melt spinning or solvent spinning processes; and / or The monofilament / multifilament yarns are twisted in the S / Z direction to a twist of 200-1000 TPM. The twisted monofilament / multifilament yarns are then plyed in the S / Z direction to a ply twist of 0.8-1.0 times the twist of the monofilament / multifilament yarns; and / or The monofilament / multifilament yarns are twisted in the S / Z direction with a twist of 200-500 TPM. The twisted monofilament / multifilament yarns are then braided into round or flat yarns using a braiding machine with a braiding density of 1-100 plies / inch. S2: Shaping treatment; S3: Pre-treat under preset temperature and humidity to obtain weft yarn that forms the free filament part inside the joint.

6. The method for preparing the weft yarn for artificial ligaments according to claim 5, characterized in that, The shaping process in step S2 can be any one of wet shaping, hot air shaping, or stretching shaping.

7. The method for preparing the weft yarn for artificial ligaments according to claim 5, characterized in that, The plying process includes: S-direction twisting of monofilament / multifilament yarns followed by Z-direction plying; and Z-direction twisting of monofilament / multifilament yarns followed by S-direction plying.

8. An artificial ligament, characterized in that, The artificial ligament is a cylindrical structure, which forms a first braided section, an intra-articular free yarn section, and a second braided section connected sequentially along the axial direction. The intra-articular free yarn section includes multiple weft yarns for the artificial ligament as described in any one of claims 1-4. The first braided section and the second braided section are both woven from weft yarns and other yarns.

9. The weft yarn for artificial ligaments according to claim 8, characterized in that, The ratio of the number of the first weft yarn to the number of the second weft yarn is 2:1 to 5:

1.

10. The weft yarn for artificial ligaments according to claim 8, characterized in that, The second weft yarn is located radially outside the round bar structure relative to the first weft yarn.

11. The artificial ligament according to claim 8, characterized in that, The first and second braided sections are made of fabric pieces woven from weft yarns, warp yarns, and chain yarns, sewn together. The warp yarns and chain yarns extend along the width direction of the fabric piece, and the length direction of the fabric piece is parallel to the axial direction of the round bar structure.

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