An expandable HA-coated PEEK knotless anchor

Abstract

This utility model discloses an expandable HA-coated PEEK knotless anchor, comprising an anchor body with barbed structures on the outer wall of the anchor body and an axially extending operating channel. Within the operating channel is a support member that can move axially along the anchor body. At least two support plates are provided at the head end of the anchor body, with the inner walls of the support plates tightly abutting the outer walls of the support members. A threading head is provided at the end of the support member near the head end of the anchor body, with a through-hole for threading sutures. When the support member moves towards the tail end of the anchor body under external force, the support plates are compressed by the outer walls of the support member and expand outwards to compress the suture. The axial movement of the support member drives the expansion of the support plates, which helps to strengthen the compression and fixation of the suture, thereby improving the reliability and fatigue load resistance of the knotless anchor. The HA coating on the surface improves the biocompatibility and new bone growth effect of the anchor.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to an expandable HA-coated PEEK knotless anchor. Background Technology

[0002] Traditional external knotless anchor implantation works by squeezing the suture to the bone tunnel interface with the anchor, so that the suture can be reliably anchored without knotting, and soft tissue repair and reconstruction can be completed quickly, making the surgery convenient and efficient.

[0003] However, due to differences in patients' osteoporosis levels and variations in the diameter of the nail holes created clinically, sutures may come out of the fatigue gap in the anchor tunnel during soft tissue repair under external forces or fatigue loads, especially before scar healing has occurred. This can lead to soft tissue repair and reconstruction failure, potentially requiring repeat surgery and increasing patient suffering. Utility Model Content

[0004] The purpose of this invention is to at least partially solve the anchoring reliability problem of externally arranged knot-free anchors mentioned in related technologies. Therefore, this invention provides an expandable HA-coated PEEK knot-free anchor, comprising an anchor body, a barb structure on the outer wall of the anchor body, an axially extending operating channel in the anchor body, and a spreading member movable along the axial direction of the operating channel. At least two spreading plates are provided at the head end of the anchor body, with the inner wall of each spreading plate tightly against the outer wall of the spreading member. A threading head is provided at the end of the spreading member near the head end of the anchor body, with a through-hole for threading a sewing thread. When the spreading member moves towards the tail end of the anchor body under external force, the spreading plates are compressed by the outer wall of the spreading member and expand outwards to tighten the sewing thread.

[0005] According to one example of the present invention, the middle section of the inner wall of the anchor body is provided with an internal thread, and the upper section of the outer wall of the spreading member is provided with an external thread that matches the internal thread. The spreading member is rotated in the forward or reverse direction to move along the axial direction of the anchor body.

[0006] According to one example of the present invention, the middle section of the expanding member has a tapered structure that is narrower at the top and wider at the bottom, and the inner wall of the expanding piece is in close contact with the outer tapered surface of the expanding member.

[0007] According to one example of the present invention, the spreading piece is integrally formed with the anchor body, and an expansion groove extending axially along the anchor body is formed between two adjacent spreading pieces.

[0008] According to one example of the present invention, the top end of the support member is provided with an internal hexagonal drive groove.

[0009] According to one example of the present invention, the spreading member has an axially extending through hole communicating with the internal hexagonal drive groove.

[0010] According to one example of the present invention, the outer surface of the anchor body is coated with an HA coating, the thickness of which is 50-80 micrometers.

[0011] According to one example of the present invention, the anchor body, the support member, the support piece, and the thread end are all made of PEEK.

[0012] According to one example of the present invention, the supporting piece is provided in four pieces, and the four supporting pieces are evenly spaced along the circumference of the supporting member.

[0013] According to one example of the present invention, the upper end of the threading head is provided with a groove, and the lower end of the supporting member is tightly fitted and fixed in the groove.

[0014] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0015] 1. The expansion of the expansion piece is driven by the axial movement of the expansion member, which can help strengthen the compression and fixation of the seam, thereby improving the reliability and fatigue load resistance of the external knotless anchor.

[0016] 2. The outer surface of the anchor body is coated with an HA coating, which further improves the biocompatibility and new bone growth effect of the anchor, and is beneficial to the patient's postoperative recovery.

[0017] 3. The anchor body, support components, support plates, and threading heads are all made of PEEK (polyether ether ketone) material, which has good mechanical properties and biocompatibility, ensuring the reliability and durability of the anchor.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the anchor structure of this utility model in its unexpanded state.

[0021] Figure 2 This is a utility model Figure 1A longitudinal half-section view.

[0022] Figure 3 This is a schematic diagram of the anchor structure in the expanded state of this utility model.

[0023] Figure 4 This is a utility model Figure 3 A longitudinal half-section view.

[0024] Figure 5 This is a schematic diagram of the axial structure of the anchor nail in its unexpanded state according to this utility model.

[0025] Figure 6 This is a structural schematic diagram of the support component of this utility model.

[0026] Figure 7 This is a schematic diagram of the thread end of this utility model.

[0027] The attached figures are labeled as follows: 1. Anchor body, 2. Barb structure, 3. Operating channel, 4. Spreading component, 5. Spreading piece, 6. Thread end, 7. Thread hole, 8. Sewing thread, 9. Internal thread, 10. External thread, 11. External conical surface, 12. Expanding groove, 13. Internal hexagonal drive groove, 14. Groove, 15. Through hole. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. Example

[0029] Please see Figures 1-7 As shown, this utility model provides an expandable HA (Hydroxyapatite) coated PEEK (polyether ether ketone) knotless anchor, including an anchor body 1. The outer wall of the anchor body 1 is provided with a barb structure 2. The anchor body 1 has an axially extending operating channel 3. The operating channel 3 is provided with a support member 4 that can move along the axial direction of the anchor body 1. The head end of the anchor body 1 is provided with at least two support plates 5. The inner wall of the support plate 5 is closely attached to the outer wall of the support member 4. The end of the support member 4 near the head end of the anchor body 1 is provided with a thread head 6. The thread head 6 is provided with a through thread hole 7 for threading the sewing thread. When the support member 4 moves towards the tail end of the anchor body 1 under the action of external force, the support plate 5 is squeezed by the outer wall of the support member 4 and expands outward to compress the sewing thread 8.

[0030] In this embodiment, the expansion of the spreading piece 5 is driven by the axial movement of the spreading member 4, which helps to strengthen the compression and fixation of the suture 8, thereby improving the reliability and fatigue load resistance of the outward-row knotless anchors. The barbed structure 2 is used to implant into the bone during impact.

[0031] Specifically, as one design form of the support member 4, the inner wall of the middle section of the anchor body 1 is provided with an internal thread 9, and the outer wall of the upper section of the support member 4 is provided with an external thread 10 that matches the internal thread 9. The support member 4 is rotated in the forward or reverse direction to move along the axial direction of the anchor body 1. The assembly and displacement control of the support member 4 are designed by means of threaded engagement, which makes operation convenient, adjustment accuracy high, and prevents it from loosening after displacement.

[0032] In this embodiment, as one of the outward expansion mechanisms of the expansion piece 5, the middle section of the expansion member 4 is designed to be a tapered structure that is narrow at the top and wide at the bottom. The inner wall of the expansion piece 5 is tightly attached to the outer tapered surface 11 of the expansion member 4. During the process of controlling the expansion member 4 to move upward, the outer tapered surface 11 continues to move upward and squeeze the expansion piece 5 outward, so that the expansion piece 5 expands outward and laterally assists in anchoring into the bone.

[0033] In this embodiment, the expansion piece 5 is integrally formed with the anchor body 1, and an expansion groove 12 extending axially along the anchor body 1 is formed between two adjacent expansion pieces 5. Preferably, there are four expansion pieces 5, which are evenly spaced along the circumference of the expansion member 4. The evenly distributed multiple expansion pieces 5 are used to expand and deform in all directions, causing the anchor head to expand outward, which can enhance the compression and fixing strength of the anchor to the seam 8.

[0034] According to one example of this utility model, the top end of the support member 4 is provided with an internal hexagonal drive groove 13, which facilitates rotational operation using a fastening tool. Furthermore, the support member 4 is provided with a through hole 15 in the axial direction that communicates with the internal hexagonal drive groove 13, which saves materials and reduces weight while ensuring the structural strength of the support member 4.

[0035] Preferably, the outer surface of the anchor body 1 is coated with an HA coating, the thickness of which is 50-80 micrometers. The HA coating is applied using methods such as plasma spraying, electrochemical deposition, or ion implantation, with plasma spraying being preferred. The resulting HA coating has a crystallinity of 90% or higher, preferably 95% or higher, a particle size between 30 and 50 micrometers, and an average thickness of 50-80 micrometers.

[0036] Preferably, the anchor body 1, the support 4, the support plate 5, and the threading head 6 are all made of PEEK. This provides excellent mechanical properties and biocompatibility, ensuring the reliability and durability of the anchor.

[0037] Preferably, the upper end of the thread end 6 is provided with a groove 14, and the lower end of the support 4 is tightly fitted and fixed in the groove 14.

[0038] The implantation process for the anchors in this application is as follows:

[0039] S1. Pass the suture that has passed through the soft tissue through the suture hole, and then push the anchor into the pre-made bone tunnel opening;

[0040] S2. Tap the anchor into the bone at the desired location, making the tail of the anchor flush with the bone surface. During the implantation process, ensure that the suture is taut to prevent it from loosening. At this point, the suture has been pressed against the inner wall of the bone tunnel by the anchor.

[0041] S3. Use a hex screwdriver to access the internal hex drive slot at the end of the support piece and turn it clockwise.

[0042] S4. As the support piece rotates and rises, the outer conical surface squeezes and expands the support piece at the head of the anchor nail, thereby strengthening the compression of the seam and improving the fixation reliability.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0044] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0045] For those skilled in the art, various changes and modifications will undoubtedly be apparent after reading the above description. Therefore, the appended claims should be considered as covering all changes and modifications that encompass the true intent and scope of this utility model. Any and all equivalent scope and content within the scope of the claims should be considered as still falling within the intent and scope of this utility model.

Claims

1. An expandable HA-coated PEEK knotless anchor, comprising an anchor body, wherein the outer wall of the anchor body is provided with a barb structure, characterized in that: The anchor body has an axially extending operating channel, and the operating channel has a support member that can move along the axial direction of the anchor body. The head end of the anchor body is provided with at least two spreading plates, and the inner wall of the spreading plates is closely attached to the outer wall of the spreading member; The end of the support member near the head of the anchor body is provided with a thread end, and the thread end is provided with a through hole for threading the sewing thread. When the expansion member moves toward the tail end of the anchor body under the action of external force, the expansion piece is squeezed by the outer wall of the expansion member and expands outward to tighten the seam.

2. The expandable HA-coated PEEK knotless anchor according to claim 1, characterized in that: The middle section of the anchor body has an internal thread, and the upper section of the expansion member has an external thread that matches the internal thread. The expansion member can be rotated in the forward or reverse direction to move along the axial direction of the anchor body.

3. The expandable HA-coated PEEK knotless anchor according to claim 1, characterized in that: The middle section of the support member has a tapered structure that is narrower at the top and wider at the bottom, and the inner wall of the support piece is in close contact with the outer tapered surface of the support member.

4. The expandable HA-coated PEEK knotless anchor according to claim 1, characterized in that: The expansion piece is integrally formed with the anchor body, and an expansion groove extending axially along the anchor body is formed between two adjacent expansion pieces.

5. The expandable HA-coated PEEK knotless anchor according to claim 2, characterized in that: The top of the support member is provided with an internal hexagonal drive groove.

6. The expandable HA-coated PEEK knotless anchor according to claim 5, characterized in that: The supporting member has a through hole in the axial direction that communicates with the internal hexagonal drive groove.

7. The expandable HA-coated PEEK knotless anchor according to claim 1, characterized in that: The outer surface of the anchor body is coated with an HA coating, the thickness of which is 50-80 micrometers.

8. The expandable HA-coated PEEK knotless anchor according to claim 1, characterized in that: The anchor body, the support member, the support plate, and the thread end are all made of PEEK.

9. The expandable HA-coated PEEK knotless anchor according to claim 1, characterized in that: The support piece consists of four pieces, which are evenly spaced along the circumference of the support member.

10. The expandable HA-coated PEEK knotless anchor according to claim 1, characterized in that: The upper end of the threading head is provided with a groove, and the lower end of the support member is tightly fitted and fixed in the groove.

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