Composite wire anchor

Abstract

The present disclosure provides a composite anchor nail with a wire, including a nail body, a clamp head and a pull wire, a concave socket is formed at the opening of the head of the nail body, a passage is formed inside the clamp head, the passage passes through two openings formed on the surface of the clamp head, the outer contour of the clamp head is formed to match the inner contour of the socket, so that the clamp head can be placed in the socket, can penetrate the clamp head through the two openings and the passage, and can be pulled out from the tail opening through the cavity, the nail body is made of a degradable material, and the clamp head is made of a non-degradable material. According to the present disclosure, the problem of nail withdrawal and fatigue risks during long-term use, and the problem of easy pull wire coming out can be avoided at the same time.

Description

Technical Field

[0001] The present disclosure relates to the field of medical devices, and in particular to a composite wire anchor. Background Art

[0002] Wire rivets are currently widely used in orthopedic clinics, especially for tendon-bone interface fixation. They have the advantages of reliable fixation, minimally invasive, and simple operation. They solve the problems of difficult tendon-bone interface fixation and poor efficacy, and greatly promote the development of minimally invasive orthopedic arthroscopy. The existing wire anchor types are divided into two types: completely non-absorbable wire anchors and completely absorbable wire anchors. Completely non-absorbable wire anchors have the risk of long-term use of nail withdrawal and fatigue, while completely absorbable wire anchors have the risk of the sliding wire easily coming out after the anchor is absorbed, causing the risk of tendon ligament avulsion. Summary of the invention

[0003] The present invention provides a composite belt-wire anchor.

[0004] Specifically, the present disclosure is achieved through the following technical solutions:

[0005] The present disclosure provides a composite wire anchor, comprising:

[0006] The nail body has a screw thread formed on the outside and a cavity formed on the inside that passes through the nail body between the head opening and the tail opening of the nail body, and a concave socket is formed at the head opening;

[0007] A chuck has a passage formed inside, the passage passes through two openings formed on the surface of the chuck, and the outer contour of the chuck is formed to match the inner contour of the socket, so that the chuck can be placed in the socket;

[0008] A pull wire capable of penetrating the chuck through the two openings and the passageway and being pulled out from the tail opening through the cavity;

[0009] Wherein, the nail body is made of a degradable material, and the clamp head is made of a non-degradable material.

[0010] In some embodiments, the clamp can be removed from the socket, and the clamp is tightened in the socket when the pull wire is pulled out from the tail opening through the cavity.

[0011] In some embodiments, the clamp head protrudes forward from the nail body.

[0012] In some embodiments, at least a portion of the outer contour of the clamp is arc-shaped, and the inner contour of the socket is a matching arc-shaped.

[0013] In some embodiments, the chuck has a spherical outer contour.

[0014] In some embodiments, the two openings can be in full communication with the cavity at the same time.

[0015] In some embodiments, each of the openings is configured so that when the clamping head is rotated to make the opening cooperate with the head opening to squeeze the pull wire, the opening can still be covered by the socket.

[0016] In some embodiments, the two openings are defined by inner side walls close to each other and outer side walls far away from each other, and the angle of the inner side wall is smaller than the angle of the outer side wall.

[0017] In some embodiments, the two openings are defined by inner side walls close to each other and outer side walls far away from each other, and the inner side walls and outer side walls of the two openings are symmetrical to each other.

[0018] In some embodiments, the chuck can only rotate relative to the socket when the chuck is tightened within the socket.

[0019] According to the embodiment of the present disclosure, by setting the wire anchor as a split structure consisting of a non-degradable clamp head and a degradable nail body, as the nail body gradually degrades and is replaced by endogenous tissue of the human body, the nail body can still keep the clamp head pressed tightly, and the pull wire is continuously kept taut through the clamp head so that it does not loosen. At the same time, due to the small size of the clamp head, long-term implantation in the cancellous bone area under the cortical bone is not prone to irritation and rejection reactions, thereby avoiding infection and tissue damage.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0022] Figure 1 is a cross-sectional view of a composite tape anchor in one embodiment of the present disclosure;

[0023] Figure 2 is a schematic diagram of a composite belt-wire anchor in an embodiment of the present disclosure;

[0024] Figure 3 is an exploded view of a composite belt-wire anchor in one embodiment of the present disclosure;

[0025] Figure 4 is a cross-sectional view of a chuck in one embodiment of the present disclosure;

[0026] Figure 5 1 is a working state diagram of a composite belt-wire anchor in an embodiment of the present disclosure.

[0027] Reference numerals:

[0028] 10: nail body; 11: head opening; 12: tail opening; 121: socket; 122: slot;

[0029] 20: chuck; 21: passage; 22: opening; 221: inner wall; 222: outer wall;

[0030] 30: Pull the wire. DETAILED DESCRIPTION

[0031] The present disclosure will now be discussed with reference to several embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0032] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to"; the terms "embodiment" and "one embodiment" are to be interpreted as "at least one embodiment"; the term "another embodiment" is to be interpreted as "at least one other embodiment"; the terms "first", "second", etc. may refer to different or the same objects; the term "setting" is not limited to direct connection or indirect connection, nor is it limited to a specific connection method. Other explicit and implicit definitions may also be included below.

[0033] In the following description, some specific numerical values ​​or numerical ranges may be involved. It should be understood that these numerical values ​​and numerical ranges are merely exemplary, which may be helpful in putting the idea of ​​the present disclosure into practice. However, the description of these examples is not intended to limit the scope of the present disclosure in any way. According to specific application scenarios and requirements, these numerical values ​​or numerical ranges can be set separately.

[0034] As described above, the existing wire anchor cannot simultaneously avoid the problem of nail withdrawal, fatigue risk, and easy disengagement of the pull wire 30 during long-term use. The composite wire anchor proposed in the embodiment of the present disclosure at least partially solves the above problems. Figures 1 to 5 The structure and working principle of the composite tape anchor according to the exemplary embodiment of the present disclosure are described below. Figure 1-5 As shown, the composite belt-wire anchor of the embodiment of the present disclosure generally includes a nail body 10, a clamp 20 and a pull wire 30, wherein the nail body 10 is used to be screwed into and fixed in the bone, the clamp 20 is used to be pressed against the bottom of the bone drill hole by the nail body 10, and the pull wire 30 is used to be passed through the clamp 20 and tightened by the clamp 20.

[0035] A thread is provided on the outside of the nail body 10, and a cavity is formed inside the nail body 10. The two ends of the cavity inside the nail body 10 are open ends, respectively formed as a head opening 11 and a tail opening 12. The head opening 11 is used to allow the pull wire 30 to pass through the cavity and thus pass through the clamp 20, and the tail opening 12 is used to allow the pull wire 30 to pass through the cavity and thus be sutured with the tendon.

[0036] In one embodiment, a concave socket 121 is formed at the head opening 11, and the concave profile of the socket 121 matches the outer profile of the chuck 20, so that at least the chuck 20 can be accommodated in the socket 121. Exemplarily, the concave profile of the socket 121 and the outer profile of the chuck 20 can be matched, so that the chuck 20 can rotate freely and smoothly in the socket 121.

[0037] In one embodiment, the tail opening 12 is formed with a specific inner angle shape for inserting a tool to screw the nail body 10. Exemplarily, the specific inner angle shape can be an inner hexagon, an inner pentagon, a quadrilateral, etc. In another embodiment, the tool can also be used to screw the screw through the outer contour of the tail of the nail body 10.

[0038] In one embodiment, the front end opening size of the socket 121 may be larger than the clamp head 20, so as to ensure that the clamp head 20 can freely escape from the socket 121 and be inserted into the socket 121. In this case, during the process of screwing into the nail body 10, the clamp head 20 does not need to move forward synchronously with the nail body 10, so as to avoid the clamp head 20 and the bone in the pre-drilled hole getting stuck, which affects the smooth screwing of the nail body 10. In addition, it also makes the assembly between the clamp head 20 and the nail body 10 more convenient.

[0039] In another embodiment, the front end opening size of the socket 121 can be smaller than the clamping head 20. Under normal circumstances, the clamping head 20 is wrapped in the socket 121, and a plurality of slots 122 are formed at the front end of the socket 121. The front end of the socket 121 is constructed as a petal-like structure, and the petal-like structure is appropriately separated to allow the clamping head 20 to escape from the socket 121 and be inserted into the socket 121. In this case, during the process of screwing into the nail body 10, the clamping head 20 always remains in the socket 121. Only the nail body 10 needs to be screwed to screw the nail body 10 and the clamping head 20 into the pre-drilled hole as a whole. The operation is simple. If the clamping head 20 is stuck with the bone in the pre-drilled hole, the rotation position of the clamping head 20 can be adjusted by pulling the pull wire 30, so that the bone jam can be smoothly passed.

[0040] In one embodiment, a passage 21 is formed inside the clamp 20, which extends through the clamp 20 and forms two openings 22 on the surface of the clamp 20, for the pull wire 30 to pass between the two openings 22, so that by pulling the pull wire 30, the clamp 20 can be tightened toward the tail of the nail body 10 in the socket 121.

[0041] When the clamp head 20 is accommodated in the socket 121, the front end of the clamp head 20 can protrude from the nail body 10 or can be retracted in the nail body 10. In one embodiment, the front end of the clamp head 20 protrudes from the nail body 10. On the one hand, during the screwing process of the nail body 10, the protruding front end of the clamp head 20 plays a guiding role, improving the smoothness of screwing the nail body 10. On the other hand, when the nail body 10 is screwed to the bottom of the pre-drilled hole, the front end of the clamp head 20 can contact the bottom of the pre-drilled hole, so that the bottom of the pre-drilled hole presses the clamp head 20 in the socket 121, ensuring that the clamp head 20 is in a stable position and does not rotate freely, thereby preventing the pull wire 30 from loosening.

[0042] In one embodiment, the outer contour of the clamp head 20 may be arc-shaped, or at least the outer contour of the rear portion of the clamp head 20 may be arc-shaped, and accordingly, the inner contour of the socket 121 may also be arc-shaped, thereby ensuring that the clamp head 20 rotates more smoothly in the socket 121. Exemplarily, the outer contour of the clamp head 20 may be spherical, which can ensure the smoothness of the rotation of the clamp head 20 in the socket 121 to the greatest extent and simplify the manufacture of the clamp head 20.

[0043] The positions of the two openings 22 formed on the surface of the clamp head 20 can be arbitrary, as long as the pull wire 30 can pull the clamp head 20 tightly into the socket 121. In one embodiment, Figure 1 As shown, the two openings 22 are both positioned toward the rear of the nail body 10, and the openings 22 are connected to the cavity in a fully covering manner, that is, the areas of the two openings 22 can be covered in the front end opening of the cavity at the same time, so that when the two pull wires 30 are tightened at the same time, it can be ensured that the two pull wires 30 will not rub against the inner wall of the cavity, ensuring that the operation process of the pull wires 30 is smoother and more labor-saving.

[0044] In one embodiment, the area and position of the two openings 22 can also be set as follows: Figure 5 As shown in Figure (b), when the clamp 20 rotates to make the lower opening 22 in the figure cooperate with the head opening 11 to squeeze the pull wire 30, the upper opening 22 in the figure can still be covered by the socket 121. This situation is suitable for quickly pulling a pull wire 30 to drive the clamp 20 to rotate, so that the other pull wire 30 is squeezed, avoiding the tendon sutured by the other pull wire 30 from being over-tightened and damaged.

[0045] Each opening 22 is defined by an inner wall 221 and an outer wall 222. In one embodiment, Figure 4As shown, the angle of the inner wall 221 is smaller than the angle of the outer wall 222, that is, the inner wall 221 and the outer wall 222 gradually expand toward the opening of the opening 22. This situation is applicable to when one pull wire 30 is quickly pulled to squeeze the other pull wire 30, and when the single pull wire 30 is further pulled, the other pull wire 30 can be kept squeezed and the sutured tendon will not be loosened. The reason for not loosening is that the contraction of the suture drives the clamp 20 to rotate, causing the one pull wire 30 to be squeezed by the inner wall 221 of the corresponding opening 22 and the nail body channel, thereby locking the other pull wire 30, and the one pull wire 30 will not contact the outer wall 222 of the corresponding opening 22, causing the clamp 20 to reverse and cause the above-mentioned loosening.

[0046] In one embodiment, the inner wall 221 and the outer wall 222 of the two openings 22 are symmetrically arranged to each other, thereby ensuring that the pulling effects of the two pull wires 30 are exactly the same, thereby improving the operator's operating experience and ease of use.

[0047] In one embodiment, the clamp 20 can be tightly accommodated in the socket 121, that is, when the clamp 20 is accommodated in the socket 121, the clamp 20 can only rotate and cannot move in other dimensions, thereby ensuring that when the nail body 10 is in the pre-drilled bottom state, the pull wire 30 will not affect the stability of the tendon tension force due to the movement of the clamp 20.

[0048] In one embodiment, the nail body 10 is made of a degradable metal material. For example, the nail body 10 can be made of a magnesium alloy. By utilizing the ductility of the metal material, during the assembly of the composite tape anchor, after the clamp 20 is placed in the socket 121, the front end of the socket 121 can be extended to open the groove 122 to close the end. Although some non-metallic materials are not conducive to the closing process, the nail body 10 can also be made of a degradable non-metallic material. For example, the nail body 10 can be made of polylactic acid (PLA), polyglycolic acid (PGA) or poly-L-lactic acid (PLLA). In another embodiment, the clamp 20 is made of a non-degradable material. For example, the clamp 20 can be made of polyetheretherketone (PEEK).

[0049] When using the composite wire anchor of the embodiment of the present disclosure, first pre-drill a hole in the bone, use a tool to screw the composite wire anchor into the pre-drilled hole, and press the clamp head 20 between the bottom of the pre-drilled hole and the socket 121, and stretch the wire 30 from the tail opening 12 and tighten it to suture the tendon. Figure 5 As shown in Figure (a), when one of the pull wires 30 is slowly pulled, the clamp head 20 does not rotate, and the other pull wire 30 can further tighten the tendon, maintaining this working state and waiting for the tendon to grow and heal; in another working state, when one of the pull wires 30 is quickly pulled, as shown in Figure 2, the clamp head 20 does not rotate, and the other pull wire 30 can further tighten the tendon, maintaining this working state and waiting for the tendon to grow and heal. Figure 5As shown in Figure (b), the friction of the pull wire 30 can drive the clamp 20 to rotate, thereby squeezing the other pull wire 30 between the clamp 20 and the front opening of the nail body 10, which is equivalent to locking the tension of the tendon sutured by the other pull wire 30 to prevent it from loosening after a period of time. This working state can be used in situations where the tendon needs a larger tension. After a period of use, the degraded part of the nail body 10 is replaced by the endogenous tissue of the human body, and the nail body 10 can still keep the clamp 20 tight, and the clamp 20 keeps the pull wire 30 tight and not loose. At the same time, due to the small size of the clamp 20, it is not easy to cause irritation and rejection reactions in the cancellous bone area under the cortical bone for a long time, avoiding infection and tissue damage.

[0050] The description of the embodiments herein and any reference to directions and orientations are only for the convenience of description and are not to be construed as any limitation on the scope of protection of the present invention. The description of the preferred embodiments may involve combinations of features, which may exist independently or in combination, and the present invention is not particularly limited to the preferred embodiments. The scope of the present invention is defined by the claims.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite wire anchor, characterized in that: include: The nail body (10) is formed with a thread on the outside and has a cavity formed inside that passes through the nail body (10) between a head opening (11) and a tail opening (12) of the nail body (10), wherein a concave recess (121) is formed at the head opening (11); A chuck (20) having a passage (21) formed therein, the passage (21) passing through two openings (22) formed on the surface of the chuck (20), the outer contour of the chuck (20) being formed to match the inner contour of the socket (121) so that the chuck (20) can be placed in the socket (121); A pull wire (30) capable of penetrating the clamp (20) through the two openings (22) and the passage (21), and being pulled out from the tail opening (12) through the cavity; Wherein, the nail body (10) is made of a degradable material, and the clamp head (20) is made of a non-degradable material; The clamp (20) can be taken out of the socket (121), and when the pull wire (30) is pulled out of the tail opening (12) through the cavity, the clamp (20) is tightened in the socket (121); when the clamp (20) is tightened in the socket (121), the clamp (20) can only rotate relative to the socket (121).

2. The composite tape anchor according to claim 1, characterized in that: The clamping head (20) protrudes forward from the nail body (10).

3. The composite tape anchor according to claim 1, characterized in that: At least part of the outer contour of the clamp (20) is in an arc shape, and the inner contour of the socket (121) is in a matching arc shape.

4. The composite tape anchor according to claim 1, characterized in that: The clamping head (20) has a spherical outer contour.

5. The composite tape anchor according to claim 1, characterized in that: The two openings (22) can be connected to the cavity simultaneously in a fully covering manner.

6. The composite tape anchor according to claim 5, characterized in that: Each of the openings (22) is configured such that when the clamping head (20) rotates to make the opening (22) cooperate with the head opening (11) to squeeze the pull wire (30), the opening (22) can still be covered by the socket (121).

7. The composite tape anchor according to claim 1, characterized in that: The two openings (22) are defined by inner side walls (221) close to each other and outer side walls (222) far from each other, and the angle of the inner side wall (221) is smaller than the angle of the outer side wall (222).

8. The composite tape anchor according to claim 1, characterized in that: The two openings (22) are defined by inner side walls (221) close to each other and outer side walls (222) far from each other, and the inner side walls (221) and outer side walls (222) of the two openings (22) are symmetrical to each other.

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