CN108209992B

CN108209992B - Ligament fixation screw

Info

Publication number: CN108209992B
Application number: CN201810065188.6A
Authority: CN
Inventors: 陈波; 胡叶枫; 王景; 贾蓓茜
Original assignee: Shanghai Ligetai Biotechnology Co ltd
Current assignee: Shanghai Ligetai Biotechnology Co ltd
Priority date: 2018-01-23
Filing date: 2018-01-23
Publication date: 2023-06-20
Anticipated expiration: 2038-01-23
Also published as: CN108209992A

Abstract

The invention provides a ligament fixing screw, which comprises a screw cover (1) and screw feet (2), wherein a plurality of screw feet (2) are connected to one of two end surfaces of the screw cover (1) along the axial direction; the plurality of nail feet (2) are arranged along the circumferential direction of the nail cover (1), and threading gaps (3) are formed among the plurality of nail feet (2); in the projection along the axial direction, the whole or part of the projection of the nail foot (2) is positioned in the projection outline of the nail cover (1); the other end of the two ends of the nail foot (2) along the axial direction opposite to the end of the nail cover (1) forms a tip; the nail leg (2) is provided with a barb (4). The invention adopts the design of double teeth (barbs), on one hand, the anti-pulling force can be effectively increased, and on the other hand, the defect that the hole on the bone is too large due to the annular barb structure is avoided.

Description

Ligament fixation screw

Technical Field

The invention relates to the field of medical instruments, in particular to a ligament fixation screw.

Background

In ligament reconstruction surgery, ligament fixation screws are used to fix both ends of a ligament directly or indirectly to ligament-attaching bones. In the prior art, the ligament fixing screw is mostly provided with a thread structure, but in the use process, the condition that the thread is invalid or the self-locking strength of the thread is insufficient to cause circumferential rotation is easy to occur. At present, ligament fixing screws with barb structures also exist, but the diameters of the ligament fixing screws are large, and the bone cavity space formed by the holes on the attached bone is increased, so that the workload of operation is increased, and the tissue trauma of a patient in operation is increased.

Disclosure of Invention

In view of the drawbacks of the prior art, an object of the present invention is to provide a ligament fixation screw.

The ligament fixation screw comprises a screw cover and screw feet, wherein a plurality of screw feet are connected to one of two end surfaces of the screw cover along the axial direction;

the plurality of nail feet are arranged along the circumferential direction of the nail cover, and threading gaps are formed among the plurality of nail feet; in the projection along the axial direction, the whole or part of the projection of the nail foot is positioned in the projection outline of the nail cover;

the other end of the two ends of the nail foot along the axial direction, opposite to the end where the nail cover is positioned, forms a tip; the nail leg is provided with a barb.

Preferably, the nail foot comprises a sleeve and a barbed slider, and the barb is positioned on the barbed slider;

the sleeve is fixedly connected with the nail cover, and the sliding of the barbed sliding block relative to the sleeve can be switched between a hidden state and a barbed state:

in the hidden state, the whole thorn slider is positioned in the sleeve;

in the piercing state, the barbs of the pierced slider reach the outer space of the sleeve.

Preferably, the nail cover comprises a first cover body and a second cover body, and the first cover body is rotationally connected with the second cover body;

the barbed sliding block comprises a guide part and a barbed part, and the guide part is fixedly connected with the barbed part;

the first cover body is provided with an arc-shaped driving groove, the second cover body is provided with a radial guide groove, and the guide part is simultaneously and slidably arranged in the arc-shaped driving groove and the radial guide groove in a penetrating manner;

the arcuate drive slot varies in radial position on the first cover as it extends in the circumferential direction of the first cover.

Preferably, two ends of the arc-shaped driving groove along the length direction respectively form a short-diameter end and a long-diameter end, and the short-diameter end is close to the central shaft of the first cover body relative to the long-diameter end along the radial direction;

the long diameter end is provided with a clamping hole which is mutually communicated with the arc-shaped driving groove.

Preferably, the barbed sliding block is provided with an injection hole therein; the injection hole comprises a main hole and a branch hole, and the main hole and the branch hole are communicated with each other;

the main hole extends along the length extending direction of the barbed sliding block, and the branch hole penetrates through the circumferential end face of the needling part.

Preferably, the diameters of the plurality of branch holes are sequentially increased along the direction from the end to the tip of the nail cover.

Preferably, the first cover body is provided with a screw, the second cover body is provided with an internal threaded hole, and the screw is arranged in the internal threaded hole in a penetrating way.

Preferably, the other end of the two ends of the screw rod along the axial direction, opposite to the end where the first cover body is positioned, is connected with a suture anchor;

ligament mounting holes are formed in the suture anchors.

Preferably, the suture anchor comprises a first suture and a second suture;

the first suture and the second suture differ in degradation rate.

Preferably, the screw cover is provided with a wiring hole, and the wall surface of the wiring hole is in smooth transition with the end surface of the top cover along the axial direction.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention adopts the design of double teeth (barbs), on one hand, the anti-pulling force can be effectively increased, and on the other hand, the defect that the hole on the bone is too large due to the adoption of the annular barb structure is avoided;

2. the invention can be completely implanted into bones in a knocking way, is convenient to operate, and simultaneously avoids the influence of local protruding processes on the movement and appearance of joints;

3. the position of the barbed slide block can be adjusted, implantation operation difficulty is reduced when the barbed slide block is hidden, a fixing screw can be adjusted after being taken out when the implantation angle or the position has deviation, and the barbed slide block is ejected out after the fixing screw is implanted in place, so that reliable fixation is realized under the action of the barbs;

4. the barbed sliding block is provided with a channel for injecting bone cement, so that the bone cement can be used for better fixing the bone cement;

5. a suture anchor is arranged in a space for ligament fixation, the suture anchor is filled in a bone cavity space through extrusion, the ligament is secondarily fixed, and meanwhile, the soft suture anchor can also prevent the ligament from being cut.

Drawings

Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:

FIG. 1 is a schematic diagram of a ligament attachment bone hole structure;

FIG. 2 is a schematic view of a ligament fixation screw according to an embodiment;

FIG. 3 is a top view of a ligament fixation screw in a variation;

FIG. 4 is a front cross-sectional view of a ligament fixation screw in a variation;

fig. 5 is a schematic detailed view of a sectional structure of a barbed slider in a variation.

The figure shows:

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the embodiment shown in fig. 2, the ligament fixing screw provided by the invention comprises a nail cover 1 and a nail foot 2, wherein a plurality of nail feet 2 are connected to one of two end surfaces of the nail cover 1 along the axial direction, a plurality of nail feet 2 are arranged along the circumferential direction of the nail cover 1, threading gaps 3 are formed among the nail feet 2, in the projection along the axial direction, the whole or part of the projection of the nail foot 2 is positioned in the projection outline of the nail cover 1, the other end of the two ends of the nail foot 2 along the axial direction opposite to the end where the nail cover 1 is positioned forms a tip, and barbs 4 are arranged on the nail foot 2. In the actual use process, the bone cavity shown in the figure 1 is firstly punched on the ligament attachment bone, the invention is directly knocked into the bone cavity, the nail foot 2 enters the corresponding bone tunnel, the artificial ligament for reconstruction is penetrated in the threading gap 3, the invention is effectively prevented from falling out of the bone cavity under the action of the barb 4, and the bone tunnel required to be chiseled on the bone is correspondingly smaller due to the smaller cross section area of the nail foot 2, so that the operation difficulty and the wound are reduced. The surface of the top cover is in smooth transition, so that the artificial ligament is prevented from being cut, and scraping and abrasion between the local protrusion and other tissues are also prevented.

As shown in fig. 3 and 4, in a variation, the nail leg 2 includes a sleeve 5 and a barbed slider 6, the barb 4 is located on the barbed slider 6, the sleeve 5 is fixedly connected with the nail cover 1, the barbed slider 6 slides relative to the sleeve 5 and can be switched between two states, i.e. a hidden state and a barbed state, in which the barbed slider 6 is entirely located in the sleeve 5, and in which the barb 4 of the barbed slider 6 reaches the outer space of the sleeve 5. Through the design, the friction between the bone cavity and the bone is reduced in the process of implantation, the operation is more labor-saving, fine adjustment can be performed when the implantation angle and the position deviate, and the barbs 4 are ejected out after implantation in place, so that the bone cavity bone implant is favorable for being firmly fixed in the bone cavity and preventing falling off. For driving, the nail cover 1 comprises a first cover body 7 and a second cover body 8, the first cover body 7 is rotationally connected with the second cover body 8, the barbed sliding block 6 comprises a guiding part 9 and a needling part 10, the guiding part 9 is fixedly connected with the needling part 10, an arc-shaped driving groove 11 is arranged on the first cover body 7, a radial guide groove 12 is arranged on the second cover body 8, the guiding part 9 simultaneously slides and penetrates through the arc-shaped driving groove 11 and the radial guide groove 12, and the radial position of the arc-shaped driving groove 11 on the first cover body 7 changes when extending along the circumferential direction of the first cover body 7. By rotating the first cover 7, the barbed slider 6 is driven to move in a radial direction, thereby extending or retracting the barbs 4 relative to the sleeve 5. Preferably, the two ends of the arc-shaped driving groove 11 along the length direction form a short diameter end and a long diameter end respectively, the short diameter end is close to the central axis of the first cover 7 relative to the long diameter end along the radial direction, the long diameter end is provided with a clamping hole 13, the clamping hole 13 is communicated with the arc-shaped driving groove 11, when the first cover 7 rotates to a certain angle, under the action of the bone cavity wall on the engaging part 10, the guiding part 9 enters the clamping hole 13 and cannot rotate circumferentially any more, and the locking of the integral structure of the invention is completed.

In a preferred embodiment, as shown in fig. 5, the barbed slider 6 is provided with an injection hole 14 therein; the injection hole 14 includes a main hole 15 and a branch hole 16, the main hole 15 and the branch hole 16 are communicated with each other, the main hole 15 extends along the length extending direction of the barbed slider 6, and the branch hole 16 penetrates the circumferential end surface of the piercing portion 10. The hole diameters of the plurality of branch holes 16 are sequentially increased along the direction from the end to the tip of the nail cover 1. Bone cement can be injected into the nail foot 2 through the injection hole 14, so that on one hand, the space in the sleeve 5 can be filled, the whole nail foot 2 is more stable in structure, and on the other hand, the nail foot 2 and bones can be further fixed, and the fixing strength is increased. Preferably, the first cover body 7 is provided with a screw 17, the second cover body 8 is provided with an internal threaded hole, and the screw 17 is penetrated in the internal threaded hole. The other of the two ends of the screw 17 along the axial direction, which is opposite to the end of the first cover 7, is connected with a suture anchor 18, and a ligament installation hole is arranged in the suture anchor 18. The suture anchor 18 comprises a first suture and a second suture, the first suture and the second suture differing in degradation rate. The screw 17 acts as a central axis of rotation preventing radial sliding between the first cover 7 and the second cover 8. The suture anchor 18, i.e. the anchor made of the suture, has the advantages that the suture is soft, the suture does not cut the artificial ligament, and the space in the bone cavity is reduced along with the knocking in of the ligament fixing screw, so that the suture anchor 18 is extruded in the bone cavity to play a secondary anchoring role on the artificial ligament. In a preferred embodiment, the suture anchor 18 may also be secured to the second cover 8. The first suture and the second suture can grow to the artificial ligament in the degradation process, the degradation rate of the first suture and the degradation rate of the second suture are different, the sufficient fixing strength can be ensured to be maintained in the degradation process, and the artificial ligament is prevented from loosening due to sudden increase of the gap. In the preferred embodiment, the screw cap 1 is provided with a wiring hole 19, and a smooth transition is formed between the hole wall surface of the wiring hole 19 and the end surface of the top cap along the axial direction, so as to prevent the artificial ligament from being cut. The setting of walking line hole 19 is convenient for the wearing out of artificial ligament, to the ligament set screw structure that the variant provided, the edge of first lid 7 sets up the arc hole, only set up alone on the second lid 8 a less trompil make the artificial ligament can wear out can, when rotating first lid 7 like this, can not draw artificial ligament circumferential direction.

The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.

Claims

1. The ligament fixation screw is characterized by comprising a screw cover (1) and screw feet (2), wherein a plurality of screw feet (2) are connected to one of two end surfaces of the screw cover (1) along the axial direction;

the plurality of nail feet (2) are arranged along the circumferential direction of the nail cover (1), and threading gaps (3) are formed among the plurality of nail feet (2); in the projection along the axial direction, the whole or part of the projection of the nail foot (2) is positioned in the projection outline of the nail cover (1);

the other end of the two ends of the nail foot (2) along the axial direction opposite to the end of the nail cover (1) forms a tip; the nail feet (2) are provided with barbs (4);

the nail leg (2) comprises a sleeve (5) and a barbed slide block (6), and the barb (4) is positioned on the barbed slide block (6);

the sleeve (5) is fixedly connected with the nail cover (1), and the sliding of the barbed sliding block (6) relative to the sleeve (5) can be switched between two states of a hidden state and a pricking state:

in the hidden state, the barbed sliding block (6) is integrally positioned in the sleeve (5);

in the piercing state, the barbs (4) of the pierced slide block (6) reach the outer space of the sleeve (5);

the nail cover (1) comprises a first cover body (7) and a second cover body (8), and the first cover body (7) is rotationally connected with the second cover body (8);

the barbed sliding block (6) comprises a guide part (9) and a needling part (10), and the guide part (9) is fixedly connected with the needling part (10);

an arc-shaped driving groove (11) is formed in the first cover body (7), a radial guide groove (12) is formed in the second cover body (8), and the guide part (9) is simultaneously and slidably arranged in the arc-shaped driving groove (11) and the radial guide groove (12);

the radial position of the arc-shaped driving groove (11) on the first cover body (7) changes when the arc-shaped driving groove extends along the circumferential direction of the first cover body (7);

the two ends of the arc-shaped driving groove (11) along the length direction respectively form a short-diameter end and a long-diameter end, and the short-diameter end is close to the central shaft of the first cover body (7) relative to the long-diameter end along the radial direction;

a clamping hole (13) is formed in the long diameter end, and the clamping hole (13) is communicated with the arc-shaped driving groove (11);

the first cover body (7) is provided with a screw (17), the second cover body (8) is provided with an internal threaded hole, and the screw (17) is arranged in the internal threaded hole in a penetrating mode.

2. Ligament setting screw according to claim 1, characterized in that the barbed slider (6) has an injection hole (14) provided therein; the injection hole (14) comprises a main hole (15) and a branch hole (16), and the main hole (15) is communicated with the branch hole (16);

the main hole (15) extends along the length extending direction of the barbed sliding block (6), and the branch hole (16) penetrates through the circumferential end face of the piercing part (10).

3. Ligament setting screw according to claim 2, characterized in that the aperture of the plurality of branch holes (16) increases in succession in the direction from the end to the tip of the screw cap (1).

4. Ligament fixation screw according to claim 1, characterized in that the threaded rod (17) is connected on the other of its two ends in the axial direction, opposite the end of the first cover (7), with a suture anchor (18);

ligament mounting holes are formed in the suture anchors (18).

5. The ligament fixation screw of claim 4, characterized in that the suture anchor (18) comprises a first suture and a second suture;

the first suture and the second suture differ in degradation rate.

6. Ligament fixation screw according to claim 1, characterized in that the screw cap (1) is provided with a routing hole (19), the wall surface of the routing hole (19) being smoothly transited to the end surface of the top cap in the axial direction.