Bone anchor

Abstract

The invention discloses a bone anchor, and relates to the field of medical instruments, an anchor body is of a central structure, an inner fixing structure is arranged on the inner wall of the anchor body, and an outer locking piece is arranged on the outer wall of the anchor body; the fixing cap is sheet-shaped, and a central hole is formed in the middle of the fixing cap; a fastening structure is arranged on the outer surface of the connecting rod, and a rod cap is arranged at one end of the connecting rod; the inner fixing structure and the fastening structure are designed to be matched in a detachable and matched mode. The effect of fixing soft tissue on bone is achieved through fastening matching of the anchor body, the fixing cap and the connecting rod, the anchor and bone tissue are connected more tightly, traditional sutures are replaced, the components are all made of magnesium alloy materials, the combination degree of the components and the bone tissue is greatly improved, the anchoring capacity is improved, and the anchoring effect is good. And meanwhile, the failure and adverse reaction caused by long-term retention of the anchor and the suture in the body after the operation are avoided. The operation steps are simplified, the operation time is shortened, and the adverse reaction caused by the operation is reduced.

Description

Technical Field

[0001] The invention relates to the field of medical devices, and in particular to a bone anchor. Background Art

[0002] Soft tissue tears are a common injury, especially in the elderly and athletes. In recent years, with the aging of the population, increased participation in sports, and improved diagnostic technology, the incidence of soft tissue tears has been on the rise. Arthroscopic cuff repair is currently the most commonly used minimally invasive surgical method and is suitable for most types of tears. The arthroscope is introduced through a small incision, and the doctor uses instruments such as wire anchors to re-fix the torn tendon to the bone under direct vision. Less trauma and faster recovery.

[0003] At present, traditional bone anchor products used in the market usually consist of two parts: anchors and sutures. Anchors are generally screw-in threaded anchors and knock-in barbed anchors. There are also anchors that only use full sutures. The anchor materials are generally non-absorbable titanium alloys, PEEK and absorbable PLA, PLGA and other materials. Sutures are generally non-degradable or partially degradable polymer materials, such as ultra-high molecular weight polyethylene.

[0004] However, this patent still has the following problems in actual use:

[0005] 1. The bone around the anchor may degenerate due to long-term pressure or osteoporosis, resulting in the anchor being loose and eventually dislocated;

[0006] 2. The suture material is not durable enough, the suture is subjected to excessive friction when passing through tissues or bones, wear or suture quality problems lead to breakage, and then the fixation of soft tissue is lost. The suture may fall out of the anchor or loosen, resulting in fixation failure;

[0007] 3. Sutures are limited by knotting and operability. If the diameter of the suture is too thin, it will cut the soft tissue and cause fixation failure.

[0008] 4. Sutures used for anchor nails are mostly non-absorbable and partially absorbable due to strength issues. In order to tighten the sutures and prevent them from loosening, several knots are usually tied. Sutures left permanently in soft tissues may cause continuous physical friction or irritation to the surrounding soft tissues and bone tissues. This irritation may cause local tissue damage, frictional synovitis or chronic pain. Some patients may feel a foreign body sensation or discomfort to the sutures left in the body after surgery. In severe cases, the sutures may be embedded in the surrounding tissues or bones over time, causing structural problems at the surgical site. The suture material may interact with tissue fibrosis, causing local induration or stiffness, and may even require a second surgery for suture cleaning or adjustment.

[0009] 5. The use of wire anchors is generally used under arthroscopy. The process of suture threading and knotting includes threading, hooking, knotting and other steps. Special instruments must be used in each step, which prolongs the operation time. Summary of the invention

[0010] In order to overcome the above defects of the prior art, the present invention provides a bone anchor to solve the problems existing in the above background technology.

[0011] The present invention provides the following technical solution: a bone anchor, comprising:

[0012] The anchor body is a central structure, the inner wall of the anchor body is provided with an inner fixing structure, and the outer wall of the anchor body is provided with an outer locking piece;

[0013] A fixing cap, which is in the shape of a thin sheet and has a central hole in the middle;

[0014] A connecting rod, the outer surface of which is provided with a fastening structure, and one end of the connecting rod is provided with a rod cap;

[0015] Among them, the internal fixing structure and the fastening structure are adapted to a detachable matching design;

[0016] When in use, the anchor body is placed in the bone using an external locking piece, the fixing cap contacts the outer side of the soft tissue, and the fastening structure of the connecting rod passes through the center hole opened in the fixing cap and is detachably connected to the internal fixing structure provided in the anchor body until the rod cap and the fixing cap are matched and adjusted to achieve the fixation of the soft tissue on the bone.

[0017] Preferably, the internal fixing structure is an internal thread with a taper, the fastening structure is an external thread with a taper, and the internal thread and the external thread are adapted to each other.

[0018] Preferably, at least two deformation openings are provided on two sides of the anchor body, and a hollow structure is provided on the side surface of the anchor body.

[0019] Preferably, the side surface of the fixing cap has a plurality of hollow holes, and the edge of the fixing cap has a chamfer.

[0020] Preferably, the connecting rod further comprises a smooth structure connected between the rod cap and the fastening structure, a pointed cutting edge provided at the front end of the fastening structure, and a connecting hole opened in front of the rod cap.

[0021] Preferably, a countersunk hole is provided on one end surface of the fixing cap in contact with the connecting rod.

[0022] Preferably, a needle-shaped conical protrusion is provided on the side of the fixing cap that contacts the tendon.

[0023] Preferably, the anchor body, the fixing cap and the connecting rod are all made of degradable magnesium alloy material.

[0024] Preferably, the external locking member is a barb or external thread structure.

[0025] Preferably, the fixing cap is in a circular or polygonal shape.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention achieves the function of fixing soft tissue on bone through the fastening cooperation of the anchor body, the fixing cap and the connecting rod, so that the anchor is more tightly connected to the bone tissue, replacing the traditional sutures. Moreover, the components are all made of magnesium alloy, which greatly improves the degree of integration with the bone tissue and the anchoring ability, and avoids the failure and adverse reactions caused by the anchor and sutures being left in the body for a long time after surgery. The surgical steps are simplified, the operation time is shortened, and the adverse reactions caused by the operation itself are reduced.

[0028] 2. The anchor body of the present invention has a deformation opening on the outside, and the anchor body and the connecting rod are connected by an expansion tapered thread structure. When the fastening structure is screwed into the internal fixation structure, the anchor body deforms outward, thereby increasing the connection between the anchor body and the bone, improving the fixing strength of the anchor, and reducing the fixation failure caused by the anchor being pulled out.

[0029] 3. The material of the anchor body of the present invention is a degradable magnesium alloy material, which not only has a bone-inducing effect during the degradation process, promotes the combination of bone tissue and anchor, increases the anchoring degree of the anchor, and avoids anchor failure caused by degradation, but also does not leave other substances in the tissue after degradation, reducing various failure problems and long-term adverse reactions caused by suture residues. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the explosion structure of one of the bone anchors of the present invention.

[0031] Figure 2 It is a schematic diagram of the cross-sectional structure of the bone anchor of the present invention.

[0032] Figure 3 It is another schematic diagram of the explosion structure of the bone anchor of the present invention.

[0033] Figure 4 It is a schematic diagram of the fixing cap structure of the present invention.

[0034] The accompanying drawings are marked as follows:

[0035] 1. Anchor body; 11. Internal fixing structure; 12. External locking member; 13. Deformation opening; 14. Hollow structure;

[0036] 2. Fixing cap; 21. Center hole; 22. Hollow hole; 23. Chamfer; 24. Countersunk hole; 25. Conical protrusion;

[0037] 3. Connecting rod; 31. Connecting hole; 32. Rod cap; 33. Smooth structure; 34. Fastening structure; 35. Pointed cutting edge. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0039] The present invention provides a bone anchor, such as Figure 1-4 As shown,

[0040] The bone anchor is composed of an anchor body 1, a fixing cap 2, and a connecting rod 3, all of which are made of magnesium alloy. The anchor body includes an outer locking piece 12, an inner fixing structure 11, and the fixing cap is provided with a center hole 21. The connecting rod 3 has a rod cap 32, a smooth structure 33, a fastening structure 34, and a pointed cutting edge 35 at the front end.

[0041] The outer locking piece 12 is anchored in the bone tissue, the connecting rod 3 passes through the central hole 21 of the fixing cap, the front edge 35 penetrates the soft tissue, and is screwed into the inner fixing structure 11 through the fastening structure 34, pressing the fixing cap 2 to fasten the tendon soft tissue to the bone surface.

[0042] The outer locking member 12 is a structure such as a barb or a thread, and is knocked into the bone or screwed in with a special instrument during use, so that the fixing cap 2 is firmly connected to the bone.

[0043] When in use, the anchor body 1 is placed in the bone using the external locking piece 12, the fixing cap 2 contacts the outer side of the soft tissue, and the fastening structure 34 of the connecting rod 3 passes through the central hole 21 opened in the fixing cap 2 and is detachably connected to the internal fixing structure 11 provided in the anchor body 1 until the rod cap 32 is interference fit with the fixing cap 2, thereby fixing the soft tissue on the bone.

[0044] The soft tissue is fixed to the bone through the fastening cooperation of the anchor body 1, the fixing cap 2 and the connecting rod 3, so that the anchor is more tightly connected to the bone tissue, replacing the traditional sutures. The components are all made of magnesium alloy, which greatly improves the degree of integration with the bone tissue and the anchoring ability, and avoids the failure and adverse reactions caused by the anchor and sutures being left in the body for a long time after surgery. The surgical steps are simplified, the operation time is shortened, and the adverse reactions caused by the operation itself are reduced.

[0045] In this embodiment, a deformation opening 13 is provided on the outside of the anchor body, the internal fixing structure 11 is a tapered thread, and the middle fastening portion 34 of the connecting rod 3 is a matching tapered thread. When the fastening structure 34 is screwed into the internal fixing structure 12, the anchor body is deformed outward, thereby increasing the connection between the anchor body and the bone, improving the fixing strength of the anchor, and reducing the fixation failure caused by the anchor being pulled out.

[0046] The edge of the fixing cap is chamfered 23, and the smooth shape can reduce irritation to the tissue and prevent the tendon and soft tissue from being cut later. There are multiple hollow holes 22 on the side to ensure the blood supply of the tendon and soft tissue, which is conducive to the healing of the soft tissue.

[0047] In this embodiment, a sharp cutting edge 35 is provided at the front end of the connecting rod 3, so that the doctor can easily pass through the soft tissue during the operation, eliminating the traditional threading and knotting steps, simplifying the operation steps, and saving the operation time.

[0048] In this embodiment, the connecting rod 3 is provided with a smooth structure 33 at the portion connected with the tendon soft tissue, thereby avoiding irritation and cutting of the tendon after surgery and ensuring that the tendon can be stably fixed on the bone surface.

[0049] In this embodiment, the center hole 21 of the fixing cap 2 is loosely matched with the connecting rod 3, and the fixing cap 2 does not move when the connecting rod 3 rotates. The fixing cap 2 fixes the tendon and soft tissue by axial pressure, which can prevent friction or cutting of the soft tendon and tissue during the screwing process.

[0050] In this embodiment, a countersunk hole 24 is provided at one end of the fixing cap 2 that contacts the connecting rod 3 for inserting the rod cap 32 of the connecting rod 3. The low-profile design reduces tissue irritation caused by leakage of the rod cap 32 of the connecting rod 3.

[0051] In this embodiment, the connecting rod 3 is provided with an instrument connecting hole 31 for matching with an external instrument. The instrument is inserted into the connecting hole 31 and the connecting rod 3 is rotated to connect the intermediate fastening structure 34 with the internal fixing structure 11 of the anchor body to achieve a fastening effect. The connecting hole can be a plum blossom, hexagonal or other structures, and the shape of the connecting hole is not limited here.

[0052] In this embodiment, a hollow structure 14, such as a round or square shape, is provided on the side of the anchor body 1, which is conducive to the growth of bone tissue into the anchor and improves the long-term fixation strength. The shape of the hollow structure is not limited here;

[0053] In this embodiment, the material of the anchor body 1 is a degradable magnesium alloy material, and the degradable magnesium alloy material is specifically: Mg-Zn-Zr-Ca series alloy, wherein the Zn content is 0.2-2%, the Zr content is 0.05-0.5%, and the Ca content is 1-2%. It has a bone induction effect during the degradation process, promotes the combination of bone tissue and the anchor, increases the anchoring degree of the anchor, avoids anchoring failure caused by degradation, and does not leave other substances in the tissue after degradation, thereby reducing various failure problems and long-term adverse reactions caused by suture residues.

[0054] Several points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0055] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A bone anchor, characterized in that: include: An anchor body (1) is a central structure, an inner wall of the anchor body (1) is provided with an inner fixing structure (11), and an outer wall of the anchor body (1) is provided with an outer locking member (12); A fixing cap (2) which is in the shape of a thin sheet and has a central hole (21) in the middle; A connecting rod (3) having a fastening structure (34) disposed on its outer surface, and a rod cap (32) disposed at one end of the connecting rod (3); The internal fixing structure (11) and the fastening structure (34) are adapted to be detachably matched; When in use, the anchor body (1) is placed in the bone using the external locking piece (12), the fixing cap (2) contacts the outer side of the soft tissue, and the fastening structure (34) of the connecting rod (3) passes through the central hole (21) provided in the fixing cap (2) and is detachably connected to the internal fixing structure (11) provided in the anchor body (1) until the rod cap (32) and the fixing cap (2) are matched and adjusted, thereby achieving the fixation of the soft tissue on the bone.

2. A bone anchor according to claim 1, characterized in that: The internal fixing structure (11) is an internal thread with a taper, the fastening structure (34) is an external thread with a taper, and the internal thread and the external thread are adapted to each other.

3. The bone anchor according to claim 1, characterized in that: At least two deformation openings (13) are provided on both sides of the anchor body (1), and a hollow structure (14) is provided on the side of the anchor body (1).

4. The bone anchor according to claim 1, characterized in that: The side surface of the fixing cap (2) is provided with a plurality of hollow holes (22), and the edge of the fixing cap (2) is provided with a chamfer (23).

5. The bone anchor according to claim 1, characterized in that: The connecting rod (3) further comprises a smooth structure (33) connected between the rod cap (32) and the fastening structure (34), a pointed cutting edge (35) provided at the front end of the fastening structure (34), and a connecting hole (31) provided in front of the rod cap (32).

6. The bone anchor according to claim 1, characterized in that: A countersunk hole (24) is provided on one end surface of the fixing cap (2) that contacts the connecting rod (3).

7. The bone anchor according to claim 1, characterized in that: The side of the fixing cap (2) in contact with the tendon is provided with a needle-shaped conical protrusion (25).

8. The bone anchor according to claim 1, characterized in that: The anchor body (1), the fixing cap (2) and the connecting rod (3) are all made of a degradable magnesium alloy material.

9. The bone anchor according to claim 1, characterized in that: The external locking piece (12) is a barb or external thread structure.

10. The bone anchor according to claim 1, characterized in that: The fixing cap (2) is circular or polygonal in shape.

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