Ligament fixing screw

Abstract

The invention relates to the field of medical instruments, in particular to a ligament fixing screw. The nail comprises a nail body, a sealing cap and a gasket, the sealing cap comprises an end plate and a guide pipe arranged on one side of the end plate, and a boss and a wire pressing groove are arranged in the guide pipe; a wire pressing head corresponding to the wire pressing groove is arranged on the gasket, and when the wire pressing head is matched with the wire pressing groove, extrusion force is applied to the implant; the implant extends between the gasket and the end plate and is fixed; and the nail body penetrates through the gasket and is screwed with the sealing cap. Through the unique structural design, the fixing stability and operation convenience of the implant are effectively improved, and the service life of an instrument is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a ligament fixing screw. Background Art

[0002] In ligament repair surgery, fixing screws are widely used to fix the graft to the bone. At the same time, in order to ensure the stability of the fixing screw, a cap is also used, that is, the cap is first implanted on the bone, and the fixing screw is installed on the cap, so as to fix the implant that replaces the ligament on the bone. Traditional ligament fixing screws are usually implanted in a straight line, that is, the implantation direction of the cap is consistent with the screw-in direction of the screw. This method may lead to insufficient fixation in some cases, the graft is easy to move or pull out, and the screw fixation effect needs to be improved.

[0003] To this end, the patent application with publication number WO2020127667A1 specifically discloses a medical fixation device for fixing implants, in which a certain angle exists between the screw-in direction of the sealing cap and the screw, thereby obtaining a better fixation effect and having higher stability. In this technical solution, a washer is also provided, and the washer is fixed by a screw so that the washer and the sealing cap are matched and kept fixed, and the implant is fixed by squeezing the washer and the sealing cap on the implant.

[0004] However, existing fixing screws still have some shortcomings in practical applications. Especially when using washers and caps for fixing, the washers and caps will exert a greater squeezing effect on the implant, causing the implant to deform. This deformation will not only affect the mechanical properties of the implant, but also cause friction between the implant and the edge of the washer and cap due to the alternating tension during the user's movement, accelerating the loss of the implant and thus shortening its service life. Therefore, how to reduce damage to the implant while ensuring the stability of the fixing screw has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The present application provides a ligament fixation screw, which has high stability and can reduce wear on the implant and increase service life. The following technical solutions are adopted: A ligament fixing screw comprises a screw body, a sealing cap and a washer; The sealing cap comprises an end plate and a conduit arranged on one side of the end plate; a boss is arranged in the conduit, and a wire pressing groove is opened on the boss; The end plate is provided with a seal that matches the catheter, and the gasket matches the seal; the gasket is provided with a wire pressing head corresponding to the wire pressing groove; the inner wall of the wire pressing groove and the surface of the wire pressing head are both arc surfaces; when the wire pressing head matches the wire pressing groove, a gap is left between the surface of the wire pressing head and the inner wall of the wire pressing groove, and the wire pressing head and the wire pressing groove apply extrusion force to the implant; The implant extends between the washer and the end plate, and the washer and the end plate cooperate to achieve fixation of the implant; The nail body passes through the washer and is screwed with the sealing cap.

[0006] By adopting the above technical solution, the implant can be initially fixed by the cooperation of the crimping head and the crimping groove, and the inner wall of the crimping groove and the surface of the crimping head are both arc surfaces, which can reduce the friction on the implant. The implant can be fixed again by the cooperation of the gasket and the end plate, further ensuring the stability and durability of the implant.

[0007] Preferably, the gasket comprises a first pressing plate and a second pressing plate, the pressing wire head is arranged on the first pressing plate, and the implant extends between the first pressing plate and the second pressing plate.

[0008] By adopting the above technical solution, the implant is clamped by the first pressing plate and the second pressing plate, so that the stability and durability of the implant can be further improved.

[0009] Preferably, a wire passing groove is provided at the edge of the first pressing sheet, and the implant extends between the first pressing sheet and the second pressing sheet through the wire passing groove.

[0010] By adopting the above technical solution, the setting of the wire groove can avoid excessive squeezing of the implant by the gasket and the end plate, thereby ensuring that the implant has sufficient strength. At the same time, the implant is bent at the position of the wire pressing head and the position at the edge of the gasket, so there is a high friction between the implant and the sealing cap, further improving the stability of the implant. Preferably, two implants are provided, and two corresponding wire grooves are provided. The two implants pass through the two wire grooves respectively and are engaged with the wire grooves. The part of the implant located in the wire groove is squeezed by the side wall of the wire groove.

[0011] By adopting the above technical solution, the two wire grooves are distributed independently, so that the two implants are separated, which can effectively increase the contact area between the gasket and the implant and improve the fixation effect.

[0012] Preferably, wire pressing teeth are provided on the opposite side walls of the first pressing plate and the second pressing plate.

[0013] By adopting the above technical solution, the setting of the wire pressing teeth can effectively improve the fixing effect of the first pressing plate and the second pressing plate on the implant, and improve the stability of the implant.

[0014] Preferably, the side walls opposite to the first pressing plate and the second pressing plate are further provided with a receiving groove, and the implant is arranged in the receiving groove; and the wire pressing teeth are arranged in the receiving groove.

[0015] By adopting the above technical solution, the receiving groove provides space for placing the implant, avoiding excessive compression of the implant by the first pressing sheet and the second pressing sheet, and ensuring the strength of the implant.

[0016] Preferably, a wire embedding groove is provided at the edge of the second pressing sheet, and the end of the implant is located inside the wire embedding groove.

[0017] By adopting the above technical solution, since the implant is relatively long, the implant needs to be trimmed after it is fixed. The implant passes through the buried wire groove and can be trimmed close to the gasket, thereby reducing the residual length of the implant after trimming. In addition, if the residual part of the implant is long, the residual part can also be stuffed into the buried wire groove to achieve no or less residual after the implant is trimmed, thereby improving the performance.

[0018] Preferably, the nail body includes a first segment and a second segment, the first pressing plate is provided with a first plug hole, the first plug hole is plugged and matched with the first segment, and the diameter of the first plug hole is smaller than the diameter of the second segment; the first pressing plate is also provided with a deformation seam, the deformation seam is connected with the first plug hole, and the position between two adjacent deformation seams is a deformation portion; The second pressing plate is provided with a second plug hole, and the second plug hole is plug-fitted with the second segment.

[0019] By adopting the above technical solution, in the initial state, the first pressing plate and the second pressing plate are separated and there is a gap. As the nail body is twisted, the step surface between the first segment and the second segment will push the first pressing plate and the crimping head to press and fix the implant, and then when the nail body is continuously twisted, the deformation part will deform so that the second segment cooperates with the first plug hole, and the first pressing plate and the second pressing plate abut against each other, so as to clamp and fix the implant between the two, thereby achieving the fixation of the implant.

[0020] Preferably, the inner wall of the seal has a first plane, and the side walls of the first pressing piece and the second pressing piece are correspondingly provided with a second plane, and when the first pressing piece and the second pressing piece are matched with the seal, the first plane and the second plane are abutted.

[0021] By adopting the above technical solution, through the cooperation of the first plane and the second plane, the first pressing plate and the second pressing plate can only move horizontally, avoiding the first pressing plate and the second pressing plate rotating with the nail body when the nail body is twisted, thereby facilitating the fixation of the implant.

[0022] In summary, the present invention includes at least one of the following beneficial technical effects: 1. Through the cooperation of the crimping head and the crimping groove, appropriate squeezing force can be applied to the implant when it enters the crimping groove, thereby achieving initial fixation, reducing excessive squeezing and deformation of the implant, and improving the mechanical properties and service life of the implant; 2. The inner wall of the crimping groove and the surface of the crimping head are both cambered, which can reduce the friction between the implant and the gasket and the sealing cap, reduce the wear of the implant during movement, and extend its service life; 3. Through the cooperation of the gasket and the end plate, the secondary fixation of the implant is achieved, the fixation effect is enhanced, and the stability and durability of the overall structure are improved, so as to better meet clinical needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the overall structure of a ligament fixation screw in an embodiment of the present application; Figure 2 is a cross-sectional view of a ligament fixation screw in an embodiment of the present application; Figure 3 is a schematic diagram of the exploded structure of the ligament fixation screw in an embodiment of the present application; Figure 4 It is a schematic diagram of the exploded structure of the ligament fixation screw in the embodiment of the present application.

[0024] Markings in the accompanying drawings: 1, nail body; 11, first section; 12, second section; 2, sealing cap; 21, end plate; 211, seal; 212, first plane; 22, guide tube; 23, boss; 231, wire pressing groove; 3, gasket; 31, first pressing plate; 311, wire passing groove; 312, deformation joint; 32, second pressing plate; 321, buried wire groove; 33, wire pressing head; 34, accommodating groove; 35, second plane. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-4 The present invention is described in further detail.

[0026] A ligament fixing screw provided in an embodiment of the present application, referring to Figure 1 and Figure 2 , including a nail body 1, a sealing cap 2 and a gasket 3. The sealing cap 2 includes an end plate 21 and a conduit 22 arranged on one side of the end plate 21; a boss 23 is arranged in the conduit 22, and a wire pressing groove is provided on the boss 23. A sealing opening 211 connected to the conduit 22 is provided on the end plate 21, and the gasket 3 cooperates with the sealing opening 211. A wire pressing head 33 corresponding to the wire pressing groove is provided on the gasket 3; the inner wall of the wire pressing groove and the surface of the wire pressing head 33 are both arc surfaces; when the wire pressing head 33 cooperates with the wire pressing groove, a gap is left between the surface of the wire pressing head 33 and the inner wall of the wire pressing groove, and the wire pressing head 33 and the wire pressing groove apply an extrusion force to the implant, thereby preliminarily fixing the implant. The nail body 1 passes through the gasket 3 and is screwed to the sealing cap 2 to achieve relative fixation of the gasket 3 and the end plate 21, and at the same time perform secondary fixation on the implant.

[0027] Specifically, the nail body 1 includes a first segment 11 and a second segment 12, the diameter of the first segment 11 is smaller, the diameter of the second segment 12 is larger, and a step surface is formed between the first segment 11 and the second segment 12. The washer 3 includes a first pressing plate 31 and a second pressing plate 32, and a wire pressing head 33 is arranged on the first pressing plate 31. The first pressing plate 31 is provided with a first plug hole, the first plug hole is plugged with the first segment 11, and the diameter of the first plug hole is smaller than the diameter of the second segment 12. The second pressing plate 32 is provided with a second plug hole, and the second plug hole is plugged with the second segment 12.

[0028] In the initial state, the first pressing piece 31 and the second pressing piece 32 are separated and there is a gap. As the nail body 1 is twisted, the step surface between the first segment 11 and the second segment 12 pushes the first pressing piece 31 close to the boss 23, and the pressing head 33 cooperates with the groove. At this time, the implant is in the groove, so that the pressing head 33 can press the implant into the groove, and the pressing head 33 applies a clamping force to the implant, thereby achieving the fixation of the implant.

[0029] Then, when the nail body 1 is continuously twisted, the nail body 1 is moved relative to the first pressing piece 31 , and the first pressing piece 31 is moved to the second section 12 .

[0030] Reference Figure 3 and Figure 4 In order to facilitate the first pressing plate 31 to cooperate with the second segment 12, a deformation seam 312 is further provided on the first pressing plate 31, and the deformation seam 312 is connected to the first insertion hole, so as to form a plurality of deformation parts around the first insertion hole.

[0031] During the relative movement between the nail body 1 and the first pressing plate 31, the deformation portion will deform, so that the second segment 12 cooperates with the first socket. As the nail body 1 continues to be twisted, the second pressing plate 32 is tightly attached to the first pressing plate 31. Prior to this, the implant needs to be placed between the first pressing plate 31 and the second pressing plate 32, so that the first pressing plate 31 and the second pressing plate 32 can clamp and fix the implant.

[0032] The inner wall of the seal 211 has a first plane 212, and the side walls of the first pressing piece 31 and the second pressing piece 32 are correspondingly provided with a second plane 35, and when the first pressing piece 31 and the second pressing piece 32 cooperate with the seal 211, the first plane 212 and the second plane 35 abut against each other. Through the cooperation of the first plane 212 and the second plane 35, the first pressing piece 31 and the second pressing piece 32 can only move in translation, and the first pressing piece 31 and the second pressing piece 32 are prevented from rotating with the nail body 1 when the nail body 1 is twisted, so as to facilitate the fixation of the implant.

[0033] The implant can be initially fixed by the cooperation of the crimping head 33 and the crimping groove. The inner wall of the crimping groove and the surface of the crimping head 33 are both arc surfaces, which can reduce the friction on the implant. The implant can be fixed again by the cooperation of the washer 3 and the end plate 21, further ensuring the stability and durability of the implant. The implant can be fixed gradually, further improving the fixation effect and reliability.

[0034] Furthermore, a wire groove 311 is provided at the edge of the first pressing plate 31, and the implant extends between the first pressing plate 31 and the second pressing plate 32 through the wire groove 311. The provision of the wire groove 311 can prevent the washer 3 and the end plate 21 from over-extruding the implant, thereby ensuring that the implant has sufficient strength. At the same time, the implant is bent at the position of the wire pressing head 33 and the position at the edge of the washer 3, so there is a high friction between the implant and the sealing cap 2, further improving the stability of the implant.

[0035] In the embodiment of the present application, the wire-passing groove 311 can be set as one or two. Since the implant needs to be folded in half according to the specific user's needs, two implants are provided in parallel. When there is only one wire-passing groove 311, the two implants are both provided in the wire-passing groove 311. When there are two wire-passing grooves 311, the two implants pass through the two wire-passing grooves 311 respectively and are engaged with the wire-passing grooves 311. Specifically, the two wire-passing grooves 311 are independently distributed, so that the two implants are separated, which can effectively increase the contact area between the gasket 3 and the implant and improve the fixing effect.

[0036] In addition, no matter there is one or two wire grooves 311 , the part of the implant located in the wire groove 311 will be squeezed by the side wall of the wire groove 311 , which increases the friction between the implant and the gasket 3 and further improves the stability of the implant.

[0037] The side walls opposite to the first pressing sheet 31 and the second pressing sheet 32 ​​are also provided with a receiving groove 34, and the implant is arranged in the receiving groove 34. The receiving groove 34 provides space for placing the implant, avoids excessive compression of the implant by the first pressing sheet 31 and the second pressing sheet 32, and ensures the strength of the implant. The receiving groove 34 is also provided with a wire pressing tooth, which can occlude and fix the implant, further enhancing the fixation effect of the implant.

[0038] Furthermore, a wire embedding groove 321 is provided at the edge of the second pressing sheet 32, and the end of the implant is located inside the wire embedding groove 321. The arrangement of the wire embedding groove 321 allows the implant to be trimmed close to the gasket 3 when the implant needs to be trimmed after the implant is fixed, thereby reducing the residual length of the implant after trimming. In addition, if the residual part of the implant is long, the residual part can also be stuffed into the wire embedding groove 321 to achieve no or less residual after the implant is trimmed, thereby improving the performance of use.

[0039] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A ligament fixation screw, characterized in that: It comprises a nail body (1), a sealing cap (2) and a washer (3); The sealing cap (2) comprises an end plate (21) and a conduit (22) arranged on one side of the end plate (21); a boss (23) is arranged in the conduit (22), and a wire pressing groove is provided on the boss (23); The end plate (21) is provided with a sealing opening (211) that matches the catheter (22), and the gasket (3) matches the sealing opening (211); the gasket (3) is provided with a wire pressing head (33) corresponding to the wire pressing groove; the inner wall of the wire pressing groove and the surface of the wire pressing head (33) are both arc surfaces; when the wire pressing head (33) matches the wire pressing groove, a gap is left between the surface of the wire pressing head (33) and the inner wall of the wire pressing groove, and the wire pressing head (33) and the wire pressing groove apply a squeezing force to the implant; The implant extends between the washer (3) and the end plate (21), and the washer (3) and the end plate (21) cooperate to achieve fixation of the implant; The nail body (1) passes through the washer (3) and is screwed to the sealing cap (2).

2. The ligament fixation screw according to claim 1, characterized in that: The gasket (3) comprises a first pressing sheet (31) and a second pressing sheet (32); the pressing head (33) is arranged on the first pressing sheet (31); and the implant extends between the first pressing sheet (31) and the second pressing sheet (32).

3. The ligament fixation screw according to claim 2, characterized in that: A wire passing groove (311) is provided at the edge of the first pressing sheet (31), and the implant extends through the wire passing groove (311) to between the first pressing sheet (31) and the second pressing sheet (32).

4. The ligament fixation screw according to claim 3, characterized in that: Two implants are provided, and two corresponding wire-passing grooves (311) are provided. The two implants pass through the two wire-passing grooves (311) respectively and are engaged with the wire-passing grooves (311). The portion of the implant located in the wire-passing groove (311) is squeezed by the side wall of the wire-passing groove (311).

5. The ligament fixation screw according to claim 2, characterized in that: Wire pressing teeth are provided on opposite side walls of the first pressing plate (31) and the second pressing plate (32).

6. The ligament fixation screw according to claim 5, characterized in that: The side walls opposite to the first pressing plate (31) and the second pressing plate (32) are also provided with a receiving groove (34), and the implant is arranged in the receiving groove (34); the wire pressing teeth are arranged in the receiving groove (34).

7. The ligament fixation screw according to claim 2, characterized in that: A wire embedding groove (321) is provided at the edge of the second pressing sheet (32), and the end of the implant is located inside the wire embedding groove (321).

8. The ligament fixation screw according to claim 1, characterized in that: The nail body (1) comprises a first segment (11) and a second segment (12); the first pressing plate (31) is provided with a first plug hole, the first plug hole is plugged into the first segment (11), and the diameter of the first plug hole is smaller than the diameter of the second segment (12); the first pressing plate (31) is also provided with a deformation seam (312), the deformation seam (312) is connected to the first plug hole, and the position between two adjacent deformation seams (312) is a deformation portion; The second pressing plate (32) is provided with a second plug hole, and the second plug hole is plug-fitted with the second segment (12).

9. The ligament fixation screw according to claim 2, characterized in that: The inner wall of the seal (211) has a first plane (212), and the side walls of the first pressing sheet (31) and the second pressing sheet (32) are correspondingly provided with a second plane (35), and when the first pressing sheet (31) and the second pressing sheet (32) are matched with the seal (211), the first plane (212) and the second plane (35) are in abutment with each other.

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