Flexible anchor

Abstract

The utility model relates to a kind of flexible anchor, and flexible anchor includes nail body and suture, the outside wall of nail body is equipped with multiple groups of perforation group along the axial direction of nail body, the number of perforation group is 2 groups to 5 groups, each group of perforation group includes two threading holes;Along the axial direction of nail body, the free end of suture sequentially slidably passes each group of perforation group, in the same perforation group, suture is threaded into nail body from one of threading hole, and is threaded out of nail body from another threading hole;Along the axial direction of the nail body, the distance between two the threading holes of same group is L1, the distance between two adjacent the perforation groups is L2, the distance between the threading hole of the end of the nail body and the end of the nail body is L3 closest to;The sum of each L1 is A, the sum of each L2 and each L3 is B, satisfy: 14 / 13≤A / B≤22 / 5.The flexible anchor can improve the feeling of operation of doctor, and also can improve flexible anchor fixing effect.

Description

Technical Field

[0001] This utility model relates to the field of medical anchor technology, and in particular to a flexible anchor. Background Technology

[0002] Flexible anchors are suitable for the repair, fixation, and reconstruction of rotator cuff, biceps tendon, glenoid labrum of the shoulder joint, collateral ligaments of the knee joint, and collateral ligaments of the ankle joint, and are also used for the connection and fixation of soft tissues and bone. During surgery, in order to maintain the tension balance of soft tissues such as tendons, surgeons often need to pull the sutures after implanting the flexible anchors to eliminate any imbalance in tension.

[0003] During this process, if the sliding friction between the suture and the nail body of the flexible anchor is too large, it will cause the doctor to feel a strong cutting sensation and poor operation feel; if the fixing strength of the flexible anchor is small, it will lead to failure such as the flexible anchor coming out, affecting the fixing effect of the flexible anchor. Utility Model Content

[0004] Therefore, it is necessary to provide a flexible anchor to address the above problems, so as to improve the doctor's operating feel and the fixation effect of the flexible anchor.

[0005] This utility model provides a flexible anchor, comprising: an anchor body, the outer wall of which is provided with a group of through holes arranged at intervals along the axial direction of the anchor body, the number of the through hole groups being 2 to 5, each group of the through hole groups including two thread holes; and a suture, the free end of which slidably passes through each group of the through hole groups in sequence. In the same group of the through hole groups, the suture enters the anchor body from one of the thread holes and exits the anchor body from the other thread hole. Along the axial direction of the anchor body, the distance between two thread holes in the same group is L1, the distance between two adjacent groups of the through hole groups is L2, and the distance between the thread hole closest to the end of the anchor body and the end of the anchor body is L3. The sum of each L1 is A, and the sum of each L2 and each L3 is B, satisfying: 14 / 13 ≤ A / B ≤ 22 / 5.

[0006] In the aforementioned flexible anchor, the free end of the suture enters the anchor body through the suture hole closest to the end of the anchor body, then exits through another suture hole in the same group of suture holes, and then re-enters and exits the anchor body through the suture hole adjacent to that suture hole. This cycle continues until the anchor body exits through the exit hole closest to the other end of the anchor body, thus completing the assembly of the flexible anchor. During implantation, the flexible anchor is implanted into a preset position on the bone tissue. By pulling the suture, the anchor body is folded into a ball, eliminating unbalanced tension, thereby fixing the flexible anchor to the bone tissue. After testing, when the number of suture groups for the flexible anchor is 2 to 5, and 14 / 13≤A / B≤22 / 5, the sliding friction force f between the suture and the anchor body can satisfy: 1N≤f≤4N. This avoids the doctor experiencing a cutting sensation when pulling the suture, thus improving the doctor's operating feel. It also improves the stability and reliability of the flexible anchor in the bone tissue, preventing failures such as anchor dislodgement, thereby improving the fixation effect of the flexible anchor.

[0007] In one embodiment, the number of perforation groups is 2, satisfying: A / B=4 / 3; or the number of perforation groups is 3, satisfying: 4 / 3≤A / B≤2 / 1; or the number of perforation groups is 4, satisfying: 5 / 2≤A / B≤3 / 1; or the number of perforation groups is 5, satisfying: 14 / 13≤A / B≤22 / 5.

[0008] In one embodiment, the number of perforation groups is 3, satisfying A / B=4 / 3; or the number of perforation groups is 3, satisfying A / B=2; or the number of perforation groups is 4, satisfying A / B=5 / 2; or the number of perforation groups is 4, satisfying A / B=11 / 4; or the number of perforation groups is 4, satisfying A / B=3; or the number of perforation groups is 5, satisfying A / B=14 / 13; or the number of perforation groups is 5, satisfying A / B=16 / 13; or the number of perforation groups is 5, satisfying A / B=22 / 5.

[0009] In one embodiment, along the axial direction of the nail body, the distance between two threading holes in the same group is L1, which satisfies: 0mm≤L1≤5mm.

[0010] In one embodiment, along the axial direction of the nail body, the distance between two adjacent sets of perforations is L2, which satisfies: 1mm≤L2≤3mm.

[0011] In one embodiment, along the axial direction of the nail body, the distance between the thread hole closest to the end of the nail body and the end of the nail body is L3, satisfying: 0mm≤L3≤3mm.

[0012] In one embodiment, along the circumference of the nail body, the two threading holes in the same group are located on the same side of the nail body or opposite to each other on both sides of the nail body.

[0013] In one embodiment, along the circumference of the nail body, the two threading holes that are close to each other in any two adjacent perforation groups are located on the same side of the nail body.

[0014] In one embodiment, the flexible anchor has an axisymmetric structure with a straight line perpendicular to the axis of the anchor body as the axis of symmetry.

[0015] In one embodiment, the length L of the nail body satisfies: 13.5mm≤L≤16.5mm; and / or the diameter D of the nail body satisfies: 0.8mm≤D≤1mm; and / or the diameter d of the suture satisfies: 0.4mm≤d≤0.6mm. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the flexible anchor nail according to the first embodiment of the present invention, wherein the number of perforation groups is 2;

[0018] Figure 2 This is a schematic diagram of the structure of the flexible anchor in the second embodiment of the present invention, wherein the number of perforation groups is 3;

[0019] Figure 3 Provided by this utility model Figure 2 A schematic diagram of another embodiment of the flexible anchor;

[0020] Figure 4 This is a schematic diagram of the structure of the flexible anchor in the third embodiment of the present invention, wherein the number of perforation groups is 4;

[0021] Figure 5 Provided by this utility model Figure 4 A schematic diagram of another embodiment of the flexible anchor;

[0022] Figure 6 This is a schematic diagram of the structure of the flexible anchor in the fourth embodiment of the present invention, wherein the number of perforation groups is 5;

[0023] Figure 7Provided by this utility model Figure 6 A schematic diagram of another embodiment of the flexible anchor;

[0024] Figure 8 This is a partial structural schematic diagram of the flexible anchor bolt according to the fifth embodiment of the present invention;

[0025] Figure 9 A test diagram of the sliding friction force between the suture and the nail body provided for this utility model;

[0026] Figure 10 Provided by this utility model Figure 9 Enlarged view of point A in the middle;

[0027] Figure 11 Dimensional diagram of the nail body provided by this utility model Figure 1 ;

[0028] Figure 12 Dimensional diagram of the nail body provided by this utility model Figure 2 .

[0029] Reference numerals: 1. Nail body; 11. Perforation group; 111. Insertion hole; 112. Exit hole; 2. Sewing thread; 3. Clamping iron sheet; 4. Iron frame; 5. Fixture. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0031] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0035] Flexible anchors are suitable for the repair, fixation, and reconstruction of rotator cuff, biceps tendon, glenoid labrum of the shoulder joint, collateral ligaments of the knee joint, and collateral ligaments of the ankle joint, and are also used for the connection and fixation of soft tissue and bone. During surgery, in order to maintain the tension balance of soft tissues such as tendons, surgeons often need to pull the sutures after implanting flexible anchors to eliminate unbalanced tension. In this process, if the sliding friction between the suture and the anchor body is too high, it will result in a strong cutting sensation for the surgeon, leading to poor operation; if the fixation strength of the flexible anchor is too low, it will lead to failure such as anchor dislodgement, affecting the fixation effect of the flexible anchor.

[0036] To solve the above problems, such as Figures 1 to 8 As shown, this utility model provides a flexible anchor to improve the doctor's operating feel and the fixation effect of the flexible anchor.

[0037] like Figures 1 to 7As shown, specifically, the flexible anchor includes a nail body 1 and a suture 2. The outer wall of the nail body 1 is provided with perforation groups 11 arranged at intervals along the axial direction of the nail body 1. The number of perforation groups 11 is 2 to 5, and each perforation group 11 includes two thread holes. The free end of the suture 2 can slide through each perforation group 11 in sequence. In the same perforation group 11, the suture 2 enters the nail body 1 from one thread hole and exits the nail body 1 from the other thread hole. The distance between the inlet hole 111 and the outlet hole 112 in the same group along the axial direction of the nail body 1 is L1, the distance between two adjacent perforation groups 11 is L2, and the distance between the inlet hole 111 or the outlet hole 112 closest to the end of the nail body 1 and the end of the nail body 1 is L3. The sum of each L1 is A, and the sum of each L2 and each L3 is B, satisfying: 14 / 13≤A / B≤22 / 5.

[0038] In the flexible anchor provided in this embodiment of the utility model, the free end of the suture 2 enters the nail body 1 through the suture hole closest to the end of the nail body 1, and then exits through another suture hole in the same group of suture holes 11. It then re-enters and exits the nail body 1 through the suture hole adjacent to that suture hole, and this cycle continues until the nail body 1 exits through the exit hole 112 at the end closest to the other end of the nail body 1, thus completing the assembly of the flexible anchor. During implantation, the flexible anchor is implanted into a preset position on the bone tissue. By pulling the suture 2, the nail body 1 is folded into a ball, eliminating any looseness or unevenness. Balanced tension is achieved to fix the flexible anchor to the bone tissue. After testing, when the number of perforation groups 11 of the flexible anchor is 2 to 5, and 14 / 13≤A / B≤22 / 5, the sliding friction force f between the suture 2 and the anchor body 1 can meet the following condition: 1N≤f≤4N. This can avoid the doctor's hand feeling when pulling the suture, thereby improving the doctor's operating feel. At the same time, it can also improve the stability and reliability of the flexible anchor in the bone tissue, avoid failure phenomena such as flexible anchor dislodgement, and thus improve the fixation effect of the flexible anchor.

[0039] like Figures 9 to 10 As shown, when testing the sliding friction force f between the suture 2 and the nail body 1, first fix the two clamping iron plates 3 on the iron frame 4, and place the assembled nail body 1 at the lower end of the clamping iron plates 3, ensuring that the distance between the two clamping iron plates 3 is slightly narrower than that between the nail body 1, so that the nail body 1 will not move synchronously with the suture 2 when the suture 2 is stretched, and the suture 2 can slide relative to the nail body 1; then, pass one end of the suture 2 through the distance between the two clamping iron plates 3 and clamp it in the fixed fixture 5 of the stretching machine, set the stretching speed to 60 mm / min, stretch the suture 2 until the suture 2 is completely removed from the nail body 1; record the maximum stretching data as the sliding friction force f between the suture 2 and the nail body 1.

[0040] For ease of description, the two thread-passing holes in each perforation group 11 are defined as insertion hole 111 and exit hole 112. In the same perforation group 11, the suture 2 enters the nail body 1 through the insertion hole 111 and exits the nail body 1 through the exit hole 112. In the illustrated embodiment, using... Figure 1 For example, the free end of the suture 2 can enter the nail body 1 through the thread hole closest to the upper end of the nail body 1, and slide sequentially through each group of holes 11 in the direction of arrow X, finally exiting the nail body 1 through the thread hole closest to the lower end of the nail body 1. That is, the free end of the suture 2 enters the nail body 1 from the upper end and exits the nail body 1 from the lower end. In this case, the thread hole closest to the upper end of the nail body 1 is the insertion hole 111, and the thread hole closest to the lower end of the nail body 1 is the exit hole 112. Of course, in other embodiments, the free end of the suture 2 can also enter the nail body 1 through the thread hole closest to the lower end of the nail body 1, and slide sequentially through each group of holes 11 in the opposite direction of arrow X, finally exiting the nail body 1 through the thread hole closest to the upper end of the nail body 1. That is, the free end of the suture 2 enters the nail body 1 from the lower end and exits the nail body 1 from the upper end. At this time, the threading hole closest to the lower end of the nail body 1 is the threading hole 111, and the threading hole closest to the upper end of the nail body 1 is the threading hole 112.

[0041] The nail body 1 can be a hollow cylindrical braided structure, and the diameter of the stitch 2 is slightly smaller than the inner diameter of the nail body 1. To facilitate the assembly of the stitch 2 and the nail body 1, the stitch 2 can pass through the gaps formed by the braided structure into the hollow interior of the nail body 1 and out of the nail body 1 through the gaps formed by the braided structure. Along the axial direction of the nail body 1, the size of a braiding point of the braided structure is generally 0.5 mm.

[0042] like Figures 1 to 7 As shown, along the axial direction of the nail body 1, the distance between the insertion hole 111 and the exit hole 112 in the same group is L1, satisfying: 0mm≤L1≤5mm. The free end of the suture 2 can enter the nail body 1 through the insertion hole 111 and then exit directly through the exit hole 112. In this case, the suture 2 penetrates the nail body 1, and L1=0mm. Alternatively, the free end of the suture 2 can also enter the nail body 1 through the insertion hole 111, pass through 2 to 10 weaving points inside the hollow interior of the nail body 1, and then exit through the exit hole 112. In this case, the suture 2 passes through the interior of the nail body 1, and 0.5mm≤L1≤5mm. To further improve the surgeon's handling and the fixation effect of the flexible anchor, L1 is preferably 2mm, 2.5mm, 3mm, or 5mm. It should be noted that the distance L1 between the insertion hole 111 and the exit hole 112 refers to the distance between the center of the insertion hole 111 and the center of the exit hole 112 on the axial direction of the nail body 1; and, since there is a certain error in the size of the braided structure, when L1 < 0.5mm, it can be regarded as L1 = 0mm.

[0043] like Figures 1 to 7 As shown, along the axial direction of the nail body 1, the distance between two adjacent sets of perforation groups 11 is L2, satisfying: 1mm ≤ L2 ≤ 3mm. That is, after the free end of the suture 2 exits the nail body 1 through the exit hole 112, it passes through 2 to 6 weaving points outside the nail body 1 and then re-enters the nail body 1 through the entry hole 111 of the adjacent perforation group 11. At this time, the suture 2 floats on the surface of the nail body 1. To further improve the doctor's handling feel and the effect of flexible anchor fixation, L2 is preferably 1mm, 1.5mm, 2mm, or 3mm. It should be noted that the distance L2 between two adjacent sets of perforation groups 11 refers to the distance along the axial direction of the nail body 1 between the center of the exit hole 112 of any perforation group 11 and the center of the entry hole 111 of the perforation group 11 adjacent to that exit hole 112. In other words, the suture 2 has at least three threading methods: penetrating the nail body 1, passing through the interior of the nail body 1, and floating on the surface of the nail body 1.

[0044] like Figures 1 to 7 As shown, along the axial direction of the nail body 1, the distance L3 between the insertion hole 111 or exit hole 112 closest to the end of the nail body 1 and the end of the nail body 1 satisfies: 0mm ≤ L3 ≤ 3mm. The free end of the suture 2 can enter or exit the nail body 1 from the end of the nail body 1. In this case, the distance L3 between the insertion hole 111 or exit hole 112 and the end of the nail body 1 is 0mm. Preferably, 1mm ≤ L3 ≤ 3mm, that is, the free end of the suture 2 first enters the nail body 1 through the insertion hole 111, which is 2 to 6 braid points away from the end of the nail body 1, and finally exits the nail body 1 through the exit hole 112, which is 2 to 6 braid points away from the end of the nail body 1. To further improve the doctor's handling feel and the fixation effect of the flexible anchor, L3 is preferably 1mm, 1.5mm, 2mm, or 3mm. It should be noted that the distance L3 between the insertion hole 111 or the exit hole 112 closest to the end of the nail body 1 and the end of the nail body 1 refers to the distance between the center of the insertion hole 111 or the exit hole 112 closest to the end of the nail body 1 and the end of the nail body 1 in the axial direction of the nail body 1.

[0045] like Figure 1 As shown, in one embodiment, the number of perforation groups 11 is 2 groups, the sum of 2 L1 is A, and the sum of L2 and 2 L3 is B, satisfying: A / B=4 / 3, and 1.26N≤f≤1.43N, for example 1.38N, etc. Specifically, the free end of the suture 2 first enters the nail body 1 through the inlet hole 111, which is 3mm away from the end of the nail body 1. After passing through the hollow interior of the nail body 1 for 3mm, it exits the nail body 1 through the outlet hole 112. After passing through the outside of the nail body 1 for 2mm, it re-enters the nail body 1 through the inlet hole 111. After passing through the hollow interior of the nail body 1 for 3mm, it finally exits the nail body 1 through the outlet hole 112. The outlet hole 112 is 3mm away from the end of the nail body 1, and the average sliding friction between the suture 2 and the nail body 1 is 1.36N.

[0046] like Figures 2 to 3 As shown, in one embodiment, the number of perforation groups 11 is 3 groups, the sum of 3 L1 is A, the sum of 2 L2 and 2 L3 is B, satisfying: 4 / 3≤A / B≤2 / 1, and 1.31N≤f≤2.22N.

[0047] Among them, such as Figure 2 As shown, A / B = 4 / 3, and 1.56N ≤ f ≤ 2.05N, for example, 1.62N. Specifically, the free end of the suture 2 first enters the nail body 1 through the insertion hole 111, which is 2mm away from the end of the nail body 1. After passing through the hollow interior of the nail body 1 for 2mm, it exits the nail body 1 through the exit hole 112. After passing through the outside of the nail body 1 for 2mm, it re-enters the nail body 1 through the insertion hole 111. After passing through the hollow interior of the nail body 1 for 2mm, it exits the nail body 1 through the exit hole 112. After passing through the outside of the nail body 1 for 2mm, it re-enters the nail body 1 through the insertion hole 111. After passing through the hollow interior of the nail body 1 for 2mm, it finally exits the nail body 1 through the exit hole 112. The exit hole 112 is 2mm away from the end of the nail body 1, and the average sliding friction between the suture 2 and the nail body 1 is 1.74N.

[0048] like Figure 3 As shown, A / B=2, and 1.31N≤f≤2.22N, for example, 1.87N, etc. Specifically, the free end of the suture 2 first enters the nail body 1 through the insertion hole 111, which is 2mm away from the end of the nail body 1, and then directly exits the nail body 1 through the exit hole 112. After passing 3mm outside the nail body 1, it re-enters the nail body 1 through the insertion hole 111. After passing 5mm inside the hollow part of the nail body 1, it exits the nail body 1 through the exit hole 112. After passing 3mm outside the nail body 1, it re-enters the nail body 1 through the insertion hole 111 and finally exits the nail body 1 directly through the exit hole 112. The exit hole 112 is 2mm away from the end of the nail body 1, and the average sliding friction between the suture 2 and the nail body 1 is 1.8N.

[0049] like Figures 4 to 5 As shown, in one embodiment, the number of perforation groups 11 is 4 groups, the sum of 4 L1 is A, the sum of 3 L2 and 2 L3 is B, satisfying: 5 / 2≤A / B≤3 / 1, and 1.52N≤f≤2.89N.

[0050] Among them, such as Figure 4As shown, A / B = 5 / 2, and 1.79 ≤ f ≤ 2.8, for example, 1.87N, etc. Specifically, the free end of the suture 2 first enters the nail body 1 through the insertion hole 111, which is 2 mm from the end of the nail body 1. After passing through the hollow interior of the nail body 1 for 2 mm, it exits the nail body 1 through the exit hole 112. After passing through the outside of the nail body 1 for 2 mm, it re-enters the nail body 1 through the insertion hole 111 and exits directly through the exit hole 112. After passing through the outside of the nail body 1 for 2 mm, it re-enters the nail body 1 through the insertion hole 111 and exits directly through the exit hole 112. After passing through the outside of the nail body 1 for 2 mm, it re-enters the nail body 1 through the insertion hole 111. After passing through the hollow interior of the nail body 1 for 2 mm, it finally exits the nail body 1 through the exit hole 112. The exit hole 112 is 2 mm from the end of the nail body 1. The average sliding friction between the suture 2 and the nail body 1 is 2.13 N.

[0051] like Figure 5 As shown, A / B = 5 / 2, and 1.52 ≤ f ≤ 2.28, for example, 2.13N, etc. Specifically, the free end of the suture 2 first enters the nail body 1 through the insertion hole 111, which is 2mm from the end of the nail body 1, and exits the nail body 1 directly through the exit hole 112. After passing 2mm outside the nail body 1, it re-enters the nail body 1 through the insertion hole 111. After passing 2mm inside the hollow part of the nail body 1, it exits the nail body 1 through the exit hole 112. After passing 2mm outside the nail body 1, it re-enters the nail body 1 through the insertion hole 111. After passing 2mm inside the hollow part of the nail body 1, it exits the nail body 1 through the exit hole 112. After passing 2mm outside the nail body 1, it re-enters the nail body 1 through the insertion hole 111 and finally exits the nail body 1 directly through the exit hole 112. The exit hole 112 is 2mm from the end of the nail body 1, and the average sliding friction between the suture 2 and the nail body 1 is 1.98N.

[0052] like Figure 4 As shown, A / B = 11 / 4, and 1.71N ≤ f ≤ 2.89N, for example, 2N, etc. Specifically, the free end of the suture 2 first enters the nail body 1 through the insertion hole 111, which is 2 mm from the end of the nail body 1. After passing through the hollow interior of the nail body 1 for 2 mm, it exits the nail body 1 through the exit hole 112. After passing through the outside of the nail body 1 for 2 mm, it re-enters the nail body 1 through the insertion hole 111 and exits directly through the exit hole 112. After passing through the outside of the nail body 1 for 3 mm, it re-enters the nail body 1 through the insertion hole 111 and exits directly through the exit hole 112. After passing through the outside of the nail body 1 for 2 mm, it re-enters the nail body 1 through the insertion hole 111. After passing through the hollow interior of the nail body 1 for 2 mm, it finally exits the nail body 1 through the exit hole 112. The exit hole 112 is 2 mm from the end of the nail body 1. The average sliding friction between the suture 2 and the nail body 1 is 2.2 N.

[0053] like Figure 4As shown, A / B=3, and 2.01N≤f≤2.61N, for example, 2.5N, etc. Specifically, the free end of the suture 2 first enters the nail body 1 through the insertion hole 111, which is 2 mm from the end of the nail body 1. After passing through the hollow interior of the nail body 1 for 2 mm, it exits the nail body 1 through the exit hole 112. After passing through the outside of the nail body 1 for 2 mm, it re-enters the nail body 1 through the insertion hole 111 and exits directly through the exit hole 112. After passing through the outside of the nail body 1 for 2 mm, it re-enters the nail body 1 through the insertion hole 111 and exits directly through the exit hole 112. After passing through the outside of the nail body 1 for 2 mm, it re-enters the nail body 1 through the insertion hole 111. After passing through the hollow interior of the nail body 1 for 2 mm, it finally exits the nail body 1 through the exit hole 112. The exit hole 112 is 2 mm from the end of the nail body 1. The average sliding friction between the suture 2 and the nail body 1 is 2.13 N.

[0054] like Figures 6 to 7 As shown, in one embodiment, the number of perforation groups 11 is 5 groups, the sum of 5 L1 is A, the sum of 4 L2 and 2 L3 is B, satisfying: 14 / 13≤A / B≤22 / 5, and 1.72N≤f≤3.24N.

[0055] Among them, such as Figure 6 As shown, A / B = 14 / 13, and 1.81N ≤ f ≤ 2.22N, for example, 1.98N, etc. Specifically, the free end of the suture 2 first enters the nail body 1 through the insertion hole 111, 1mm from the end of the nail body 1, and exits directly through the exit hole 112. After passing 1mm outside the nail body 1, it re-enters the nail body 1 through the insertion hole 111. After passing 2mm inside the hollow part of the nail body 1, it exits the nail body 1 through the exit hole 112. After passing 1.5mm outside the nail body 1, it re-enters the nail body 1 through the insertion hole 111. After passing 2.5mm inside the hollow part of the nail body 1, it... The nail body 1 is inserted through the through hole 112, passes 1.5 mm outside the nail body 1, and then re-inserts the nail body 1 through the through hole 111. After passing 2 mm inside the hollow part of the nail body 1, the nail body 1 is inserted through the through hole 112, passes 1 mm outside the nail body 1, and then re-inserts the nail body 1 through the through hole 111 and finally exits the nail body 1 directly through the through hole 112. The distance between the through hole 112 and the end of the nail body 1 is 1 mm. The average sliding friction between the suture 2 and the nail body 1 is 2 N.

[0056] like Figure 6As shown, A / B = 16 / 13, and 1.72N ≤ f ≤ 2.08N, for example, 1.76N, etc. Specifically, the free end of the suture 2 first enters the nail body 1 through the insertion hole 111, 1mm from the end of the nail body 1, and exits directly through the exit hole 112. After passing 1mm outside the nail body 1, it re-enters the nail body 1 through the insertion hole 111. After passing 2mm inside the hollow part of the nail body 1, it exits through the exit hole 112. After passing 2mm outside the nail body 1, it re-enters the nail body 1 through the insertion hole 111. After passing 2.5mm inside the hollow part of the nail body 1, it exits through the exit hole 112. The thread 2 passes through the exit hole 112 and then passes through the outside of the nail body 1 for 2 mm before passing through the entry hole 111 again. After passing through the hollow interior of the nail body 1 for 2 mm, the thread 2 passes through the exit hole 112 and then passes through the outside of the nail body 1 for 1 mm before passing through the entry hole 111 again and finally passes through the exit hole 112. The exit hole 112 is 1 mm away from the end of the nail body 1. The average sliding friction between the thread 2 and the nail body 1 is 1.85 N.

[0057] like Figure 7 As shown, A / B = 22 / 5, and 1.93N ≤ f ≤ 3.24N, for example, 2.26N, etc. Specifically, the free end of the suture 2 first enters the nail body 1 through the insertion hole 111, which is 1.5mm from the end of the nail body 1, and then directly exits the nail body 1 through the exit hole 112. After passing 2mm outside the nail body 1, it re-enters the nail body 1 through the insertion hole 111 and directly exits the nail body 1 through the exit hole 112. After passing 2mm outside the nail body 1, it re-enters the nail body 1 through the insertion hole 111. After passing 2.5mm inside the hollow interior of the nail body 1, it exits through the exit hole 112. The nail body 1 is passed through the exit hole 112. After passing 2mm outside the nail body 1, the nail body 1 is re-entered through the entry hole 111 and directly exits through the exit hole 112. After passing 2mm outside the nail body 1, the nail body 1 is re-entered through the entry hole 111 and finally exits through the exit hole 112. The exit hole 112 is 1.5mm away from the end of the nail body 1. The average sliding friction between the stitch 2 and the nail body 1 is 2.48N.

[0058] In this way, doctors can select appropriate flexible anchors according to actual needs. The specific test results for the number of perforations in group 11, the sum of each L1 (A), the ratio of each L2 to the sum of each L3 (B) (A / B), the range of sliding friction, and the average sliding friction are shown in the table below.

[0059]

[0060] Furthermore, the fixation strength of the flexible anchor is generally proportional to the number of perforation groups 11. Tests showed that the fixation strength of the flexible anchor generally increases with the number of perforation groups 11. Doctors can select flexible anchors with an appropriate number of perforation groups 11 based on actual needs. It is worth noting that the fixation strength of the flexible anchor is also affected by various factors such as the material and structure of the flexible anchor, bone density, and implantation technique. Therefore, it is possible that a large number of perforation groups 11 may result in weak fixation strength. The statement that the fixation strength of the flexible anchor is generally proportional to the number of perforation groups 11 refers to ignoring the error caused by these factors affecting the fixation strength of the flexible anchor.

[0061] like Figures 1 to 7 As shown, in one embodiment, along the circumference of the nail body 1, the two threading holes of the same group are both located on the same side of the nail body 1 or opposite to each other on both sides of the nail body 1. That is, the inlet hole 111 and the outlet hole 112 of the same group are both located on the same side of the nail body 1 or opposite to each other on both sides of the nail body 1. Along the circumference of the nail body 1, the two threading holes that are close to each other in any two adjacent hole groups 11 are both located on the same side of the nail body 1. That is, the outlet hole 112 of any hole group 11 and the inlet hole 111 of the hole group 11 adjacent to the outlet hole 112 are both located on the same side of the nail body 1. It should be noted that "the insertion hole 111 and the exit hole 112 of the same group are both located on the same side of the nail body 1" means that the center of the insertion hole 111 and the center of the exit hole 112 are on the same generatrix or approximately the same generatrix on the cylindrical surface of the nail body 1. "The insertion hole 111 and the exit hole 112 of the same group are located opposite each other on both sides of the nail body 1" means that the center of the insertion hole 111 and the center of the exit hole 112 are on two opposite generatrix or approximately opposite generatrix on the cylindrical surface of the nail body 1. "The exit hole 112 of any hole group 11 and the insertion hole 111 of the hole group 11 adjacent to the exit hole 112 are both located on the same side of the nail body 1" means that the center of the exit hole 112 and the center of the insertion hole 111 are on the same generatrix or approximately the same generatrix on the cylindrical surface of the nail body 1. The generatrix refers to any straight line parallel to the axis on the cylindrical surface. Here, errors caused by production and assembly are ignored. Thus, the insertion holes 111 and exit holes 112 of each perforation group 11 are all on the same plane passing through the axis of the nail body 1, so as to facilitate the assembly of the thread 2 and the nail body 1. Specifically, when the thread 2 passes through the nail body 1, the free end of the thread 2 enters the nail body 1 from the insertion hole 111 on one side of the nail body 1, and then exits from the exit hole 112 on the other side of the nail body 1; when the thread 2 passes through the inside of the nail body 1, the free end of the thread 2 enters the nail body 1 from the insertion hole 111 on one side of the nail body 1, and then exits from the exit hole 112 on the same side of the nail body 1; and when the free end of the thread 2 exits from the exit hole 112 on one side of the nail body 1 and floats on the surface of the nail body 1, it will re-enter the nail body 1 from the insertion hole 111 on the same side of the nail body 1.

[0062] like Figure 8As shown, in other embodiments, the insertion holes 111 and exit holes 112 of the same group can also be located at any position on the outer wall of the nail body 1 along the circumference of the nail body 1; the exit hole 112 of any group of holes 11 and the insertion hole 111 of the group of holes 11 adjacent to the exit hole 112 can also be located at any position on the outer wall of the nail body 1. In this case, 1.5N ≤ f ≤ 2.5N, for example, 1.57N, 1.82N, 2.15N, etc. It should be noted that the arbitrary positions of the insertion holes 111 and exit holes 112 in the same group on the outer wall of the nail body 1 refer to the centers of the insertion holes 111 and 112 lying on any two generatrices of the cylindrical surface of the nail body 1. Similarly, the arbitrary positions of the exit holes 112 of any perforation group 11 and the insertion holes 111 of the perforation group 11 adjacent to the exit holes 112 on the outer wall of the nail body 1 refer to the centers of the exit holes 112 and 111 lying on any two generatrices of the cylindrical surface of the nail body 1. Thus, the insertion holes 111 and exit holes 112 of each perforation group 11 can be located at any position circumferentially on the outer wall of the nail body 1 as needed.

[0063] like Figure 1 As shown, the flexible anchor has an axisymmetric structure with the straight line perpendicular to the axis of the nail body 1 as the axis of symmetry S. The axisymmetric structure facilitates the assembly of the suture 2 and the nail body 1, and also makes it easier for the doctor to pull the suture 2 after implanting the flexible anchor. Furthermore, the flexible anchor is subjected to uniform force in all directions after implantation, thereby reducing the risk of breakage or loosening and improving the fixation effect of the flexible anchor.

[0064] like Figures 11 to 12 As shown, in one embodiment, the length L of the nail body 1 satisfies: 13.5mm ≤ L ≤ 16.5mm, where the length L of the nail body 1 can be any value within the range of 13.5mm to 16.5mm, such as 13.5mm, 14mm, 14.5mm, 15mm, 16mm, 16.2mm, 16.5mm, etc.; the diameter D of the nail body 1 satisfies: 0.8mm ≤ D ≤ 1mm, where the diameter D of the nail body 1 can be any value within the range of 0.8mm to 1mm, such as 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, etc.; the diameter d of the suture 2 satisfies: 0.4mm ≤ d ≤ 0.6mm, where the diameter d of the suture 2 can be any value within the range of 0.4mm to 0.6mm, such as 0.4mm, 0.5mm, 0.599mm, 0.6mm, etc. The length of the suture 2 can be selected according to the threading method of the suture 2 in the nail body 1 and the needs of the doctor's operation. Of course, in other embodiments, the length L and diameter D of the nail body 1 and the diameter d of the suture 2 can also be selected according to the actual application environment and other needs. This utility model embodiment does not impose specific limitations here.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A flexible anchor, characterized in that, include: The nail body (1) has through-hole groups (11) arranged at intervals along the axial direction of the nail body (1) on its outer side wall. The number of through-hole groups (11) is 2 to 5, and each through-hole group (11) includes two threading holes; and The suture (2) has its free end slidably passing through each of the perforation groups (11). In the same perforation group (11), the suture (2) enters the nail body (1) from one of the perforation holes and exits the nail body (1) from the other perforation hole. Along the axial direction of the nail body (1), the distance between two threading holes in the same group is L1, the distance between two adjacent groups of threading holes (11) is L2, and the distance between the threading hole closest to the end of the nail body (1) and the end of the nail body (1) is L3. The sum of each L1 is A, and the sum of each L2 and each L3 is B, satisfying: 14 / 13≤A / B≤22 / 5.

2. The flexible anchor bolt according to claim 1, characterized in that, The number of perforation groups (11) is 2, satisfying: A / B = 4 / 3; or The number of perforation groups (11) is 3, satisfying: 4 / 3 ≤ A / B ≤ 2 / 1; or The number of perforation groups (11) is 4, satisfying: 5 / 2 ≤ A / B ≤ 3 / 1; or The number of perforation groups (11) is 5, satisfying: 14 / 13≤A / B≤22 / 5.

3. The flexible anchor according to claim 2, characterized in that, The number of perforation groups (11) is 3, satisfying: A / B = 4 / 3; or The number of perforation groups (11) is 3, satisfying: A / B = 2; or The number of perforation groups (11) is 4, satisfying: A / B = 5 / 2; or The number of perforation groups (11) is 4, satisfying: A / B = 11 / 4; or The number of perforation groups (11) is 4, satisfying: A / B = 3; or The number of perforation groups (11) is 5, satisfying: A / B = 14 / 13; or The number of perforation groups (11) is 5, satisfying: A / B = 16 / 13; or The number of perforation groups (11) is 5, satisfying: A / B = 22 / 5.

4. The flexible anchor according to any one of claims 1-3, characterized in that, Along the axial direction of the nail body (1), the distance between the two threading holes in the same group is L1, which satisfies: 0mm≤L1≤5mm.

5. The flexible anchor according to any one of claims 1-3, characterized in that, Along the axial direction of the nail body (1), the distance between two adjacent sets of perforation groups (11) is L2, which satisfies: 1mm≤L2≤3mm.

6. The flexible anchor according to any one of claims 1-3, characterized in that, Along the axial direction of the nail body (1), the distance between the thread hole closest to the end of the nail body (1) and the end of the nail body (1) is L3, which satisfies: 0mm≤L3≤3mm.

7. The flexible anchor according to claim 1, characterized in that, Along the circumference of the nail body (1), the two threading holes in the same group are located on the same side of the nail body (1) or opposite sides of the nail body (1).

8. The flexible anchor according to claim 1, characterized in that, Along the circumference of the nail body (1), the two threading holes that are close to each other in any two adjacent perforation groups (11) are all located on the same side of the nail body (1).

9. The flexible anchor according to claim 1, characterized in that, With a straight line perpendicular to the axis of the nail body (1) as the axis of symmetry, the flexible anchor has an axisymmetric structure.

10. The flexible anchor according to claim 1, characterized in that, The length L of the nail body (1) satisfies: 13.5mm ≤ L ≤ 16.5mm; and / or The diameter D of the nail body (1) satisfies: 0.8mm ≤ D ≤ 1mm; and / or The diameter d of the suture (2) satisfies: 0.4mm≤d≤0.6mm.

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