A type of hollow stitching anchor

Abstract

This invention provides a hollowed-out suture anchor, belonging to the field of medical device technology. The anchor includes a first and second column arranged parallel and facing each other, and a thread wound around the two columns; two adjacent threads and the two columns enclose a hollowed-out structure distributed on both sides of the column plane. The improvement lies in: connecting pieces are evenly spaced on each side of the hollowed-out structure, the connecting pieces closing the hollowed-out structure and their outer surfaces forming the root of the thread, with the connecting pieces on both sides arranged alternately. This design strengthens the anchor structure through the connecting pieces, significantly improving torsional strength while preserving the bone tissue ingrowth channel.

Description

Technical Field

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

[0002] Existing technology includes a type of suture anchor with a hollowed-out external thread structure. The advantage of this type of anchor is that after implantation, soft tissue and bone tissue can easily grow into the hollow structure, greatly improving surgical outcomes and patient recovery speed. However, this type of anchor has insufficient torsional strength due to its weak structure, making it prone to breakage during bone implantation, especially when the anchor is made of medical-grade polyetheretherketone (PEEK). For example, publication number CN116803349A discloses a hollowed-out suture anchor with a hollowed-out thread structure. Two identical first and second posts are arranged facing each other and parallel to each other, with the thread wrapped around the outside of the first and second posts. The hollowing-out rate of the anchor is ≥80%. ， This makes the anchor "thin". Although this type of anchor has a good bone ingrowth effect, it has the disadvantage of being prone to breakage during the implantation process.

[0003] Therefore, it is necessary to design a suture anchor that is both resistant to breakage and conducive to tissue ingrowth. Summary of the Invention

[0004] The purpose of this invention is to provide a hollow suture anchor that is not easily broken and facilitates tissue ingrowth.

[0005] The technical solution provided by this utility model is:

[0006] A perforated stitching anchor, comprising:

[0007] First column;

[0008] The second column is exactly the same in size and structure as the first column, and the second column is arranged facing and parallel to the first column;

[0009] The thread is wound as a whole around the assembly formed by the first column and the second column in a continuous helical structure, and is connected to the outer side of the first column and the outer side of the second column. The thread and the assembly form an inner cavity that penetrates the head and tail of the anchor. The area enclosed by two adjacent threads of the thread and the assembly between the two adjacent threads forms a hollow structure, and the hollow structure is distributed on both sides of the plane where the assembly is located.

[0010] A connecting piece is provided to close the hollow structure, and the side of the connecting piece that connects to the thread becomes the root of the thread. The connecting pieces are equally spaced along the hollow structure on the same side, and the connecting pieces on different sides are staggered.

[0011] Preferably, a stop for threading the suture is provided between the first column and the second column located at the head of the suture anchor.

[0012] As a preferred embodiment, the stitching anchor is designed as a single piece.

[0013] Preferably, the inner cavity of the anchor is coated with a coating containing growth factors, wherein the growth factors are selected from bone morphogenetic proteins (BMPs), fibroblast growth factors (FGFs), and bioactive ions (Mg²⁺). 2+ One or more of the following: ( ) . The growth factors within the lumen can promote bone growth, thereby shortening the patient's recovery time.

[0014] Preferably, the thread is a single-start thread.

[0015] Preferably, the thread is a double-threaded thread.

[0016] More preferably, the suture anchor is made of medical-grade PEEK material.

[0017] The beneficial effects of the suture anchor of this invention are: the anchor structure is strengthened by the connecting piece, which not only significantly improves the torsional strength, but also preserves the bone tissue ingrowth channel. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the suture anchor in Example 1;

[0019] Figure 2 This is a front view of the suture anchor in Example 1;

[0020] Figure 3 yes Figure 2 Top view;

[0021] Figure 4 yes Figure 2 The left view;

[0022] Figure 5 This is a schematic diagram of the suture anchor in Example 2;

[0023] Figure 6 yes Figure 5 Side view;

[0024] Figure 7 This is a schematic diagram of the structure of a proportionally scaled, hollowed-out stitching anchor.

[0025] In the diagram, 1 is the anchor, 2 is the first column, 3 is the second column, 4 is the single-threaded thread, 5 is the hollow structure, 6 is the connecting piece, 7 is the stop block, and 8 is the double-threaded thread. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description of the suture anchor of this utility model is provided through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this utility model.

[0027] This utility model discloses a hollow-type stitched anchor, comprising: a first column, a second column, a thread, and a connecting piece. The first and second columns are identical in size and structure, and the second column faces and is parallel to the first column. The thread is wound in a continuous spiral structure around the assembly formed by the first and second columns, and connects to the outer sides of the first and second columns. The thread and the assembly form an inner cavity penetrating the head and tail of the anchor. Two adjacent threads of the thread and the area enclosed by the first and second columns between two adjacent threads form a hollow structure, which is distributed on both sides of the plane of the assembly. The connecting piece closes the hollow structure, and the side of the connecting piece connected to the thread becomes the root of the thread. The connecting pieces are evenly spaced along the hollow structure on the same side, and the connecting pieces on different sides are staggered. The thread can be a single-threaded thread or a double-threaded thread. A stop block may or may not be provided between the first and second columns; when a stop block is provided, the stitching passes through the inside of the anchor; when no stop block is provided, the stitching passes through the outside of the anchor.

[0028] Preferably, to protect the suture, a stop is provided between the first and second posts of the anchor head for suture passing through, allowing the suture to pass through the inside of the anchor. The end of the anchor that first inserts into the bone is the head, and the end that last embeds into the bone is the tail. In use, the suture first passes through the inner cavity of the suture anchor, then around the stop and out of the inner cavity again. The suture anchor with the suture is then screwed into a pre-drilled hole, and the suture outside the bone tissue fixes the soft tissue. This method of passing the suture through the inside of the anchor avoids the suture being cut by the threads, thus protecting the suture.

[0029] As a better option, the anchor 1 is designed as a single piece.

[0030] Preferably, the inner cavity of the anchor is coated with a coating containing growth factors, wherein the growth factors are selected from bone morphogenetic proteins (BMPs), fibroblast growth factors (FGFs), and bioactive ions (Mg²⁺). 2+ One or more combinations of )

[0031] As a preferred embodiment, the first column, the second column, the thread, the connecting piece, and the stop are all made of medical-grade polyetheretherketone (PEEK) material.

[0032] Example 1

[0033] like Figures 1 to 4As shown, this embodiment provides a hollow suture anchor 1, including: a first column 2, a second column 3, a single-threaded thread 4, and a connecting piece 6, all integrally molded from medical-grade PEEK material. The first column 2 and the second column 3 are identical in size and structure, and are arranged parallel to each other and facing each other. The single-threaded thread 4 is continuously wound around the outside of the combination of the first column 2 and the second column 3, forming an inner cavity that runs through the head and tail of the anchor 1 between the first column 2 and the second column 3. Adjacent threads and the two columns enclose a hollow structure 5, which is distributed on both sides of the plane where the two columns are located. The connecting piece 6 is evenly spaced on each side of the hollow structure 5 and closes the hollow structure 5. The side of the connecting piece 6 that connects to the thread forms the root of the single-threaded thread 4. The connecting pieces 6 on the same side are evenly spaced, and the connecting pieces 6 on both sides are staggered, which ensures that the anchor is subjected to uniform force. A stop block 7 is provided between the two columns at the head of the anchor 1 (the end that is first implanted into the bone) for passing the suture. The inner cavity coating of the anchor contains growth factors (BMPs, FGFs, or Mg). 2+ The coating (any one or more combinations thereof) increases cell adhesion and promotes osteogenic response. The path of the suture into the anchor is as follows: the suture passes through the anchor cavity in sequence → around the stop 7 → exits the anchor cavity.

[0034] Example 2

[0035] The main difference between Example 2 and Example 1 is that the thread is a double-threaded thread and there is no stop 7 between the two columns of the anchor head.

[0036] like Figures 5 to 6 As shown, this embodiment provides a hollow suture anchor 1, including: a first column 2, a second column 3, a double-threaded 8, and connecting pieces 6, all integrally molded from medical-grade PEEK material. The first column 2 and the second column 3 are identical in size and structure, parallel and facing each other. The double-threaded 8 is continuously wound around the outside of the combination of the first column 2 and the second column 3, forming an inner cavity penetrating the head and tail of the anchor 1 between the first column 2 and the second column 3. Adjacent threads and the double columns enclose a hollow structure 5, which is distributed on both sides of the plane of the double columns. Connecting pieces 6 are evenly spaced on each side of the hollow structure 5 and close the hollow structure 5; one side of the connecting thread forms the root of the double-threaded 8. The connecting pieces 6 on the same side are evenly spaced, and the connecting pieces 6 on both sides are staggered, ensuring uniform force distribution on the anchor. To promote bone ingrowth, the inner cavity of the anchor is coated with growth factors (such as BMPs, FGFs, or Mg). 2+ A coating consisting of one or more of the following (or a combination thereof). The suture and anchor are passed through as follows: the suture is inserted into a pre-drilled hole, and then the suture anchor is screwed in, with the suture positioned between the bone tissue and the threads of the anchor.

[0037] The method of using this utility model is as follows:

[0038] When the anchor 1 is equipped with a stop 7, a corresponding number and specification of sutures are pre-threaded onto the stop. The anchor 1 with sutures is then inserted into the head of the anchor implanter. The anchor 1 is then inserted into the pre-drilled hole. Sutures outside the bone tissue are then passed through the soft tissue and tightened to achieve fixation of the soft tissue. When the anchor 1 is not equipped with a stop 7, the sutures are placed in the pre-drilled hole. After the anchor is screwed in, the sutures are pressed between the bone tissue and the thread. Sutures outside the bone tissue are then passed through the soft tissue and tightened to achieve fixation of the soft tissue.

[0039] Comparative Example

[0040] This comparative example uses a type of hollow-out stitching anchor in the prior art as a comparison. The structure of the comparative example is as follows: Figure 7 As shown, the device includes a threaded section and two identical first and second pillars of the same size and construction, integrally molded from medical-grade PEEK material. The first and second pillars are arranged facing each other and parallel to each other, with the threaded section winding around them and connecting to the outer sides of the first and second pillars.

[0041] Torsional strength test

[0042] Under the same test conditions, the torsional strength test values ​​of the suture anchor of this invention were compared with those of the comparative example. The results are shown in Table 1:

[0043] Table 1

[0044]

[0045] As shown in Table 1, under the same conditions (using medical-grade PEEK material and the same anchor diameter), the torque values ​​of the anchors in Examples 1 and 2 are greater than those in the comparative example, indicating that the torsional strength of Examples 1 and 2 is higher than that of the comparative example under the same conditions. The comparative example's suture anchor, due to its completely hollowed-out threaded structure, is structurally weak, resulting in low torsional strength and a tendency to break during bone implantation. In contrast, the anchor of this invention features regularly arranged connecting pieces on its hollowed-out structure. These connecting pieces make the anchor itself more robust, and their regular arrangement ensures more even stress distribution. Therefore, the anchor of this invention has better torsional strength.

[0046] In summary, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A suture anchor of the hollowed-out type, characterized in that, include: First column; The second column is exactly the same in size and structure as the first column, and the second column is arranged facing and parallel to the first column; The thread is wound as a whole around the assembly formed by the first column and the second column in a continuous helical structure, and is connected to the outer side of the first column and the outer side of the second column. The thread and the assembly form an inner cavity that penetrates the head and tail of the anchor. The area enclosed by two adjacent threads of the thread and the assembly between the two adjacent threads forms a hollow structure, and the hollow structure is distributed on both sides of the plane where the assembly is located. A connecting piece is provided to close the hollow structure, and the side of the connecting piece that connects to the thread becomes the root of the thread. The connecting pieces are equally spaced along the hollow structure on the same side, and the connecting pieces on different sides are staggered.

2. The suture anchor of claim 1, wherein, A stop for threading the sewing is provided between the first column and the second column located at the head of the anchor.

3. The suture anchor of claim 2, wherein, The anchor is designed as a single piece.

4. The suture anchor of claim 1, wherein, The inner cavity of the anchor is coated with a coating comprising a growth factor selected from one of bone morphogenetic proteins (BMPs), fibroblast growth factors (FGFs), bioactive ions (Mg 2+ ) 5. The suture anchor of claim 1, wherein, The thread is a single-thread thread.

6. The suture anchor of claim 1, wherein, The thread is a double-threaded thread.

7. The suture anchor of any of claims 1-6, wherein the suture anchor is a hollow suture anchor. The anchor is made of medical-grade PEEK material.

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