Low-creep suture and processing method thereof

Abstract

The invention discloses a low-creep suture and a processing method thereof. The low-creep suture comprises a non-twist composite fiber line, and the non-twist composite fiber line comprises a non-twist UHMWPE fiber yarn and a non-twist PEEK fiber yarn which is doubled and stranded with the non-twist UHMWPE fiber yarn; a plurality of non-twist composite fiber lines are woven to form a low-creep stitch; the processing method of the low-creep suture comprises the following steps: S1, directly doubling and stranding untwisted UHMWPE (Ultra High Molecular Weight Polyethylene) fibers and untwisted PEEK (Polyetheretherketone) fibers on a winding machine to obtain untwisted composite fibers; synchronously rotating and winding the non-twist composite fiber wire to form a composite spindle; s2, the composite spindles are installed on a round pipe knitting machine or a flat belt knitting machine to be knitted to form low-creep stitches; according to the low-creep suture, the strength and the fracture resistance of the suture are improved, the creep rate and the elongation are reduced, the twisting process is reduced, stretching and deformation elongation caused by twist are avoided, and the performance requirements of orthopedic implant sutures can be met.

Description

Technical Field

[0001] The present application relates to the technical field of medical equipment, and in particular to a low creep suture and a processing method thereof. Background Art

[0002] Surgical sutures are medical devices primarily used for hemostasis, suturing, and tissue fixation. Suture performance directly impacts surgical outcomes and wound healing. Ideally, a suture should possess high strength, high elasticity, and low creep, maintaining appropriate tension during wound healing to prevent loosening or tissue cutting. However, current sutures on the market present several challenges. For example, they can easily become loose and deformed or stretch under tensile stress, resulting in reduced tissue compression after suturing and impairing postoperative recovery. Alternatively, sutures can become loose after being tied, increasing the risk of infection.

[0003] In order to increase the strength of sutures, the mixed yarns of braided sutures are often twisted, but this method also brings some problems, such as the complicated twisting process and increased costs; the twist of the yarn will also affect the creep of the suture, that is, the greater the twist, the greater the inclination angle of the fiber yarn, and the suture will release deformation and elongate during stretching, thereby reducing the stability of the suture and affecting the recovery of the wound after surgery. Summary of the Invention

[0004] In order to improve the defects of sutures such as easy stretching and deformation and poor stability, the present application provides a low creep suture and a processing method thereof.

[0005] The present application provides a low creep suture and a processing method thereof using the following technical solutions: A low-creep suture comprises a twist-free composite fiber line, wherein the twist-free composite fiber line comprises a twist-free UHMWPE fiber filament and a twist-free PEEK fiber filament twisted in parallel with the twist-free UHMWPE fiber filament; the twist-free UHMWPE fiber filament and the twist-free PEEK fiber filament are twisted in parallel to form the twist-free composite fiber line, and a plurality of the twist-free composite fiber lines are braided to form the low-creep suture.

[0006] By adopting the above technical solution, the twist-free UHMWPE fiber filaments and the twist-free PEEK fiber filaments are directly combined and stranded on a winding machine to obtain a twist-free composite fiber line composed of the twist-free UHMWPE fiber filaments and the twist-free PEEK fiber filaments; the twist-free composite fiber line is then woven by a braiding machine to form a low-creep suture; the low-creep suture maintains a high suture strength and fracture resistance, while reducing the creep rate and elongation, and the processing process is simple, reducing the twisting process, avoiding the stretching and deformation elongation caused by the twist, and can meet the performance requirements of orthopedic implant sutures; the low-creep suture is not easy to relax, deform or stretch under tensile stress, the tissue compression force after suturing is enhanced, the low-creep suture is not easy to loosen after being knotted, which increases the stability of the low-creep suture, reduces the impact on postoperative recovery, and reduces the risk of infection.

[0007] Preferably, the linear density of the untwisted composite fiber line is T, the linear density of the untwisted UHMWPE fiber filament is t1, and the linear density of the untwisted PEEK fiber filament is t2; T=t1+t2.

[0008] By adopting the above technical solution, the linear density of the twist-free composite fiber line is equal to the sum of the linear density of the twist-free UHMWPE fiber filaments and the linear density of the twist-free PEEK fiber filaments, which can maintain the high strength and low creep properties of the twist-free UHMWPE fiber filaments and the twist-free PEEK fiber filaments, and enhance the wear resistance and stability of the twist-free composite fiber line.

[0009] Preferably, the low creep suture includes a round tubular suture and a flat braided suture.

[0010] By adopting the above technical solution, the circular tube suture is a tubular structure with a circular cross-section. The circular tube suture can provide strong tension, so that the sutured tissue can fit tightly and prevent bleeding and infection; the braided suture is a strip suture. The braided suture can provide better knotting properties, so that the sutured tissue can remain stable and prevent loosening and cracking; the combination of UHMWPE fiber filaments and PEEK fiber filaments improves the strength of the circular tube suture and the braided suture, enhances the suturing effect, and provides support for tissue healing.

[0011] Preferably, the round tube suture includes a suture body and a round hole provided on and passing through the suture body.

[0012] By adopting the above technical solution, the suture body is woven from untwisted composite fiber yarns. The circular holes on the suture body improve the elasticity and supporting force of the suture body. The suture body has a low friction coefficient and encounters little resistance when passing through tissue. The suture is smoother during suturing, reducing dragging and damage to the tissue and allowing the sutured tissue to fit tightly.

[0013] Preferably, the round tube suture further includes a reinforcement line inserted into the round hole.

[0014] By adopting the above technical solution, the reinforcing thread is passed through the circular hole to further improve the strength of the circular tube suture, provide sufficient structural support for the suture body, and help the circular tube suture remain stable during surgery.

[0015] A method for processing a low creep suture, comprising the low creep suture described above, further comprising the following steps: S1: directly doubling the twist-free UHMWPE fiber filament and the twist-free PEEK fiber filament on a winding machine to obtain the twist-free composite fiber line; the twist-free composite fiber line is synchronously rotated and wound to form a composite spindle; S2: The composite spindle is mounted on a circular tube braiding machine or a flat ribbon braiding machine for braiding to form a low creep suture.

[0016] By adopting the above technical solution, the twist-free UHMWPE fiber filaments and the twist-free PEEK fiber filaments are directly twisted together to obtain a twist-free composite fiber line, which helps to reduce the creep problem caused by the twist of the fiber line; the twist-free composite fiber line is used to make a composite spindle, which improves the weaving efficiency and quality, and ensures the consistency and stability of the twist-free composite fiber line; by using the composite spindle on a circular tube braiding machine or a flat ribbon braiding machine, a low-creep suture is produced. The low creep performance helps to reduce the deformation and elongation of the low-creep suture under tensile stress, and helps to ensure reliability and stability in scenarios such as surgery.

[0017] Preferably, step S1 includes the following steps of doubling and plying: S101: selecting a diameter of a low creep suture and determining a linear density of the untwisted composite fiber used for the low creep suture; S102: installing the twist-free UHMWPE fiber filaments and the twist-free PEEK fiber filaments corresponding to the twist-free composite fiber linear density on a creel, and setting the tension of the twist-free composite fiber linear; S103: setting the number of meters, speed, stop point, and inner spindle length of the winding of the twist-free composite fiber line, and running and debugging the winding machine; S104: The twist-free UHMWPE fiber filaments and the twist-free PEEK fiber filaments are paralleled and twisted by a winding unit.

[0018] By adopting the above technical solution, the linear density of the twist-free composite fiber line used is determined by selecting the wire diameter of the low-creep suture, and the linear density of the twist-free composite fiber line is adjusted to further adjust the size and strength of the required low-creep suture; the twist-free UHMWPE fiber yarn and the twist-free PEEK fiber yarn are installed on the creel according to the specific linear density, and the tension of the twist-free composite fiber line is set. Accurately setting the tension of the fiber line helps to ensure stability and consistency during the winding process; the number of meters, speed, winding point and other parameters of the twist-free composite fiber line winding are set, and the winding machine is operated and debugged to ensure precise control of the production process and the manufacturing quality and stability of the suture; the twist-free UHMWPE fiber yarn and the twist-free PEEK fiber yarn are combined and stranded by the winding unit to ensure the quality of the twist-free composite fiber line, without twisting, thereby reducing the creep of the twist-free composite fiber line.

[0019] Preferably, in step S104, the number of the untwisted UHMWPE fiber filaments is n1, the number of the untwisted PEEK fiber filaments is n2, and the total number of fiber filaments of the untwisted composite fiber line is n; n=n1+n2;2≤n≤4.

[0020] By adopting the above technical solution, the total number of twist-free composite fiber yarns made by combining different numbers of twist-free UHMWPE fiber yarns and twist-free PEEK fiber yarns is between 2 and 4, ensuring a moderate number and linear density of twist-free composite fiber yarns and improving the strength and applicability of the twist-free composite fiber yarns.

[0021] Preferably, the linear density of the untwisted composite fiber line in step S2 is T, and T includes T1, T2, T3, and T4 with increasing values; the number of weaving spindles on the circular tube weaving machine in step S3 is N, and N includes N1, N2, N3, and N4 with increasing values.

[0022] By adopting the above technical solution, the linear density of the twist-free composite fiber thread and the number of braiding spindles on the circular tube braiding machine are set with multiple specification values. According to the linear density of the required low-creep suture, the linear density of the twist-free composite fiber thread and the number of braiding spindles on the circular tube braiding machine are adjusted accordingly to adapt to different needs and surgical application scenarios.

[0023] Preferably, step S2 includes the following weaving steps: S201: taking out the composite spindle wound with the twist-free composite fiber line, and confirming the linear density, meter length, and quantity of the composite spindle; S202: Change the corresponding gear combination for the circular tube braiding machine or set the braiding density and speed for the flat belt braiding machine; S203: Mounting the composite spindle on a knitting machine spindle; S204: releasing the twist-free composite fiber line from the composite spindle, and first passing the yarn bundle of the twist-free composite fiber line through a central braiding hole; S205: Winding the twist-free composite fiber line on the figure eight wheel according to the trajectory; S206: Lead a section of braided low creep suture thread onto the take-up reel and adjust the take-up tension.

[0024] By adopting the above technical solution, the density and quantity of the twist-free composite fiber lines are confirmed according to the density of the low creep suture, the corresponding number of composite spindles are installed, and the twist-free composite fiber lines are introduced into the weaving machine, thereby improving the accuracy of the density and quantity of the twist-free composite fiber lines required for weaving low creep sutures, and improving the quality and production efficiency of low creep sutures.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. A low-creep suture, comprising twist-free UHMWPE fiber filaments and twist-free PEEK fiber filaments of the same linear density being directly doubling and plying on a winding machine to obtain a twist-free composite fiber yarn composed of the twist-free UHMWPE fiber filaments and the twist-free PEEK fiber filaments; the twist-free composite fiber yarn is then braided by a braiding machine to form a low-creep suture; the low-creep suture has improved suture strength and fracture resistance, reduced creep rate and elongation, and a simple processing process, which reduces the twisting process and avoids stretching and deformation elongation caused by twist, thereby meeting the performance requirements of orthopedic implant sutures; the low-creep suture is not prone to relaxation, deformation, or elongation under tensile stress, thereby enhancing tissue compression after suturing and preventing the low-creep suture from loosening after being knotted, thereby increasing the stability of the low-creep suture, reducing the impact on postoperative recovery, and reducing the risk of infection; 2. A low-creep suture processing method, wherein twist-free UHMWPE fiber filaments and twist-free PEEK fiber filaments are directly twisted together to obtain a twist-free composite fiber line, which helps to reduce the creep problem caused by the twist of the fiber line; the twist-free composite fiber line is used to make a composite spindle, which improves the weaving efficiency and quality, and ensures the consistency and stability of the twist-free composite fiber line; low-creep sutures are produced by using the composite spindles on a circular tube weaving machine or a flat ribbon weaving machine. The low creep performance helps to reduce the deformation and elongation of the low-creep suture under tensile stress, and helps to ensure reliability and stability in scenarios such as surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of a circular tube suture in an embodiment of a low creep suture of the present application.

[0027] Figure 2 This is a flowchart of the steps of an embodiment of a low creep suture processing method of the present application.

[0028] Figure 3 This is a flow chart of the steps of twisting and plying of an embodiment of a low creep suture processing method of the present application.

[0029] Figure 4 This is a flow chart of the steps of knitting an embodiment of a low creep suture processing method of the present application.

[0030] Description of reference numerals: 1. Round tube suture; 11. Suture body; 12. Round hole; 13. Reinforcement line. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-4 This application is described in further detail.

[0032] The present invention discloses a low-creep suture and a processing method thereof. The low-creep suture comprises a twist-free composite fiber yarn, which comprises twist-free UHMWPE fiber filaments and twist-free PEEK fiber filaments twisted together with the twist-free UHMWPE fiber filaments. The twist-free UHMWPE fiber filaments and the twist-free PEEK fiber filaments are twisted together to form a twist-free composite fiber yarn, and multiple twist-free composite fiber yarns are braided to form the low-creep suture.

[0033] In the present application, twist-free UHMWPE fiber yarns and twist-free PEEK fiber yarns of the same linear density are directly combined on a winding machine to obtain a twist-free composite fiber yarn composed of twist-free UHMWPE fiber yarns and twist-free PEEK fiber yarns; the twist-free composite fiber yarn is then woven by a braiding machine to form a low-creep suture; the low-creep suture has improved suture strength and fracture resistance, reduced creep rate and elongation, and has a simple processing process, reduces the twisting process, avoids stretching and deformation elongation caused by twist, and can meet the performance requirements of orthopedic implant sutures; the low-creep suture is not easy to relax, deform or stretch under tensile stress, and the tissue compression force after suturing is enhanced. The low-creep suture is not easy to loosen after being knotted, which increases the stability of the low-creep suture, reduces the impact on postoperative recovery, and reduces the risk of infection.

[0034] UHMWPE is ultra-high molecular weight polyethylene (Ultra-High Molecular Weight Polyethylene). UHMWPE fiber is a high-performance fiber with high strength and high modulus. UHMWPE fiber also has the properties of impact resistance, chemical corrosion resistance, low density, fatigue resistance, and high biocompatibility. PEEK refers to polyetheretherketone (PEEK). PEEK is an aromatic crystalline thermoplastic polymer. PEEK has good biocompatibility, wear resistance, fatigue resistance, corrosion resistance, and easy processing. At the same time, PEEK has high dimensional stability, rigidity and creep resistance.

[0035] The twist-free UHMWPE fiber and the twist-free PEEK fiber maintain high strength, and the twist-free UHMWPE fiber and the twist-free PEEK fiber have low creep and low elongation, and can be better used in medical operations.

[0036] Furthermore, the linear density of the untwisted composite fiber line is T, the linear density of the untwisted UHMWPE fiber filament is t1, and the linear density of the untwisted PEEK fiber filament is t2; T=t1+t2.

[0037] The linear density of the twist-free composite fiber line of the present application is equal to the sum of the linear density of the twist-free UHMWPE fiber filaments and the linear density of the twist-free PEEK fiber filaments, which can maintain the high strength and low creep properties of the twist-free UHMWPE fiber filaments and the twist-free PEEK fiber filaments, thereby improving the linear density of the twist-free composite fiber line and enhancing the strength, wear resistance and stability of the twist-free composite fiber line. In addition, when t1 = 50D and t2 = 50D, T = t1 + t2 = 50D + 50D = 100D, which facilitates the precise linear density of the twist-free composite fiber line and facilitates production and processing. The unit D in this application is denier, which represents the gram weight of 9000m of fiber; 50D, that is, the gram weight of 9000m of fiber is 50g.

[0038] Furthermore, if Figure 1 As shown, the low creep suture includes a round tube suture 1 and a flat braided suture.

[0039] The circular tube suture of the present application is a tubular structure with a circular cross-section. The circular tube suture can provide strong tension, so that the sutured tissue can fit tightly and prevent bleeding and infection; the braided suture is a strip suture, and the braided suture can provide better knotting properties, so that the sutured tissue can remain stable and prevent loosening and cracking; the combination of UHMWPE fiber filaments and PEEK fiber filaments improves the strength of the circular tube suture and the braided suture, enhances the suture effect, and provides support for tissue healing; the present application also discloses that the low creep suture also includes a flat flat belt suture; the flat belt suture is a strip suture, and the flat belt suture can provide better knotting properties, so that the sutured tissue can remain stable and prevent loosening and cracking.

[0040] Specifically, if Figure 1As shown, the round tube suture 1 includes a suture body 11 and a round hole 12 provided on the suture body 11 and passing through the suture body 11 .

[0041] The suture body 11 of the present application is woven from untwisted composite fiber yarns. The suture body 11 has a low friction coefficient and encounters little resistance when passing through tissues, making suturing smoother, reducing dragging and damage to tissues, and allowing the sutured tissues to fit tightly.

[0042] More specifically, if Figure 1 As shown, the round tube suture 1 further includes a reinforcement line 13 inserted into the round hole 12 .

[0043] The reinforcing wire 13 of the present application is preferably a twist-free UHMWPE fiber filament, a twist-free PEEK fiber filament, a twist-free composite fiber wire, and a yarn; the reinforcing wire 13 is passed through the circular hole 12 to further improve the strength of the circular tube suture 1, provide sufficient structural support for the suture body 11, and help the circular tube suture 1 to maintain stability during surgery; the twist-free UHMWPE fiber filament has high strength, and the twist-free PEEK fiber filament has low creep performance; the strength and creep of the twist-free composite fiber wire tend to the intermediate mean, and the yarn is thicker as a whole, thereby improving the overall performance.

[0044] like Figure 2 As shown, the present application discloses a low creep suture processing method, including a low creep suture, and further comprising the following steps: S1: Directly doubling and plying the twist-free UHMWPE fiber filaments and the twist-free PEEK fiber filaments on a winding machine to obtain a twist-free composite fiber line; the twist-free composite fiber line is synchronously rotated and wound to form a composite spindle; S2: The composite spindle is mounted on a circular tube braiding machine or a flat tape braiding machine for braiding to form a low creep suture.

[0045] In this application, twist-free UHMWPE fiber filaments and twist-free PEEK fiber filaments are directly combined to obtain twist-free composite fiber yarns, which helps to reduce the creep problem caused by the twist of the fiber yarns; the twist-free composite fiber yarns are used to make composite spindles, which improves the efficiency and quality of weaving and ensures the consistency and stability of the twist-free composite fiber yarns; low-creep sutures are produced by using composite spindles on circular tube weaving machines or flat ribbon weaving machines. The low creep performance helps to reduce the deformation and elongation of the low-creep sutures under tensile stress, and helps to ensure reliability and stability in scenarios such as surgery.

[0046] In addition, if Figure 3 As shown, step S1 includes the following steps of doubling and plying: S101: Selecting a diameter of a low creep suture and determining a linear density of a twist-free composite fiber line used for the low creep suture; S102: installing twist-free UHMWPE fiber filaments and twist-free PEEK fiber filaments corresponding to the twist-free composite fiber linear density on a creel, and setting the tension of the twist-free composite fiber line; S103: setting the number of meters, speed, stop point, and inner spindle length of the twist-free composite fiber winding, running the winding machine, and debugging; S104: The twist-free UHMWPE fiber filaments and the twist-free PEEK fiber filaments are combined and stranded by a winding unit.

[0047] The present application determines the linear density of the twist-free composite fiber line used by selecting the wire diameter of the low creep suture; this customized selection helps to meet specific needs so that the suture meets the required size and strength; the twist-free UHMWPE fiber filaments and the twist-free PEEK fiber filaments are installed on the creel, and the tension of the twist-free composite fiber line is set. Accurately setting the tension of the fiber line helps to ensure stability and consistency during the winding process; the number of meters, speed and other parameters of the winding of the twist-free composite fiber line are set, and the winding machine is operated and debugged to ensure precise control of the production process and the manufacturing quality and stability of the suture; the twist-free UHMWPE fiber filaments and the twist-free PEEK fiber filaments are combined and stranded by the winding unit to ensure the quality of the twist-free composite fiber line and reduce the creep of the twist-free composite fiber line.

[0048] The winding parameters of the twist-free composite fiber are shown in Table 1.

[0049] Table 1 Winding process parameters As shown in Table 1, when the twist-free composite fiber line with a line density specification of 150D is produced, the twist-free composite fiber line density T = t1 + t2 = 100D + 50D = 150D or T = t1 + t2 = 50D + 100D = 150D, the speed of the winding machine is set to 50m / min, the initial winding point is 3.5mm, the starting point is 10mm, the stopping point is 10mm, the inner spindle length is 110mm / 130mm / 114mm, and the braking time is 0.05s; thereby improving the quality and stability of the twist-free composite fiber line doubling and plying.

[0050] Furthermore, in step S104, the number of untwisted UHMWPE fiber filaments is n1, the number of untwisted PEEK fiber filaments is n2, and the total number of fiber filaments in the untwisted composite fiber line is n; n=n1+n2;2≤n≤4.

[0051] The present application uses a combination of different numbers of twist-free UHMWPE fiber filaments and twist-free PEEK fiber filaments to make a twist-free composite fiber line with a total number of between 2 and 4, ensuring a moderate number and linear density of twist-free composite fiber lines, and improving the strength and applicability of the twist-free composite fiber line.

[0052] Furthermore, in step S2, the linear density of the untwisted composite fiber line is T, and T includes T1, T2, T3, and T4 with increasing values. In step S3, the number of weaving spindles on the circular tube weaving machine is N, and N includes N1, N2, N3, and N4 with increasing values.

[0053] In this application, T1=100D, T2=200D, T3=300D, T4=400D, N1=4, N2=6, N3=8, N4=16; the linear density of the twist-free composite fiber thread and the number of braiding spindles on the circular tube braiding machine are set with multiple specification values. According to the linear density of the required low creep suture, the linear density of the twist-free composite fiber thread and the number of braiding spindles on the circular tube braiding machine are adjusted accordingly to adapt to different needs and surgical application scenarios.

[0054] Furthermore, if Figure 4 As shown, step S2 includes the following weaving steps: S201: taking out the composite spindle wound with the twist-free composite fiber line, and confirming the linear density, meter length and quantity of the composite spindle; S202: Change the corresponding gear combination for the circular tube braiding machine or set the braiding density and speed for the flat belt braiding machine; S203: Mounting the composite spindle on the knitting machine's running spindle; S204: unwinding the twist-free composite fiber line from the composite spindle, and first passing the yarn bundle of the twist-free composite fiber line through the central braiding hole; S205: winding the twist-free composite fiber line on the figure eight wheel according to the trajectory; S206: Lead a section of braided low creep suture thread onto the take-up reel and adjust the take-up tension.

[0055] This application confirms the density and quantity of the twist-free composite fiber line based on the low creep suture density, installs the corresponding number of composite spindles, and introduces the twist-free composite fiber line into the weaving machine, thereby improving the accuracy of the density and quantity of the twist-free composite fiber line required for weaving low creep sutures, and improving the quality and production efficiency of low creep sutures.

[0056] The implementation principle of a low creep suture and a processing method thereof in an embodiment of the present application is as follows: for the low creep suture, twist-free UHMWPE fiber filaments and twist-free PEEK fiber filaments of the same linear density are directly twisted and stranded on a winding machine to obtain a twist-free composite fiber yarn composed of twist-free UHMWPE fiber filaments and twist-free PEEK fiber filaments; the twist-free composite fiber yarn is then woven by a braiding machine to form a low creep suture; the low creep suture has improved suture strength and fracture resistance, reduced creep rate and elongation, and has a simple processing process, reduces the twisting process, avoids stretching and deformation elongation caused by twist, and can meet the performance requirements of orthopedic implant sutures; the low creep suture is not easy to relax, deform or stretch under tensile stress, and the tissue compression force after suturing is enhanced. The low creep suture is not easy to loosen after being knotted, which increases the stability of the low creep suture, reduces the impact on postoperative recovery, and reduces the risk of infection; The low-creep suture processing method directly combines twist-free UHMWPE fiber filaments and twist-free PEEK fiber filaments to obtain twist-free composite fiber yarns, which helps to reduce the creep problem caused by the twist of the fiber yarns; the twist-free composite fiber yarns are used to make composite spindles, which improves the weaving efficiency and quality, and ensures the consistency and stability of the twist-free composite fiber yarns; low-creep sutures are produced by using composite spindles on circular tube weaving machines or flat ribbon weaving machines. The low creep performance helps to reduce the deformation and elongation of the low-creep sutures under tensile stress, which helps to ensure reliability and stability in scenarios such as surgery; the total number of twist-free composite fiber yarns made by combining twist-free UHMWPE fiber filaments and twist-free PEEK fiber filaments of different numbers is between 2 and 4, which ensures a moderate number and linear density of twist-free composite fiber yarns, and improves the strength and applicability of the twist-free composite fiber yarns.

[0057] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A low creep suture, characterized in that: The low creep suture includes a twist-free composite fiber line, which includes a twist-free UHMWPE fiber filament and a twist-free PEEK fiber filament twisted in parallel with the twist-free UHMWPE fiber filament; the twist-free UHMWPE fiber filament and the twist-free PEEK fiber filament are twisted in parallel to form the twist-free composite fiber line, and multiple twist-free composite fiber lines are woven to form the low creep suture.

2. A low creep suture according to claim 1, characterized in that: The linear density of the untwisted composite fiber line is T, the linear density of the untwisted UHMWPE fiber filament is t1, and the linear density of the untwisted PEEK fiber filament is t2; T=t1+t2.

3. The low creep suture according to claim 1, characterized in that: The low creep suture comprises a round tube suture (1) and a flat braided suture.

4. The low creep suture according to claim 3, characterized in that: The circular tube suture (1) comprises a suture body (11) and a circular hole (12) provided on the suture body (11) and passing through the suture body (11).

5. The low creep suture according to claim 4, characterized in that: The circular tube suture (1) further comprises a reinforcement line (13) inserted into the circular hole (12).

6. A low creep suture processing method, characterized in that: The low creep suture according to any one of claims 1 to 5 further comprises the following steps: S1: directly doubling the twist-free UHMWPE fiber filament and the twist-free PEEK fiber filament on a winding machine to obtain the twist-free composite fiber line; the twist-free composite fiber line is synchronously rotated and wound to form a composite spindle; S2: The composite spindle is mounted on a circular tube braiding machine or a flat ribbon braiding machine for braiding to form a low creep suture.

7. A low creep suture processing method according to claim 6, characterized in that: Step S1 includes the following steps of doubling and plying: S101: selecting a diameter of a low creep suture and determining a linear density of the untwisted composite fiber used for the low creep suture; S102: installing the twist-free UHMWPE fiber filaments and the twist-free PEEK fiber filaments corresponding to the twist-free composite fiber linear density on a creel, and setting the tension of the twist-free composite fiber linear; S103: setting the number of meters, speed, stop point, and inner spindle length of the winding of the twist-free composite fiber line, and running and debugging the winding machine; S104: The twist-free UHMWPE fiber filaments and the twist-free PEEK fiber filaments are paralleled and twisted by a winding unit.

8. A low creep suture processing method according to claim 7, characterized in that: In step S104, the number of the untwisted UHMWPE fiber filaments is n1, the number of the untwisted PEEK fiber filaments is n2, and the total number of fiber filaments in the untwisted composite fiber line is n; n=n1+n2;2≤n≤4。 9. A low creep suture processing method according to claim 6, characterized in that: The linear density of the untwisted composite fiber line in step S2 is T, and T includes T1, T2, T3, and T4 with increasing values. The number of braiding spindles on the circular tube braiding machine in step S3 is N, and N includes N1, N2, N3, and N4 with increasing values.

10. A low creep suture processing method according to claim 7, characterized in that: Step S2 includes the following weaving steps: S201: taking out the composite spindle wound with the twist-free composite fiber line, and confirming the linear density, meter length, and quantity of the composite spindle; S202: Change the corresponding gear combination for the circular tube braiding machine or set the braiding density and speed for the flat belt braiding machine; S203: Mounting the composite spindle on a knitting machine spindle; S204: releasing the twist-free composite fiber line from the composite spindle, and first passing the yarn bundle of the twist-free composite fiber line through a central braiding hole; S205: Winding the twist-free composite fiber line on the figure eight wheel according to the trajectory; S206: Lead a section of braided low creep suture thread onto the take-up reel and adjust the take-up tension.

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