CN112754639A

CN112754639A - Novel interface screw

Info

Publication number: CN112754639A
Application number: CN202110109807.9A
Authority: CN
Inventors: 王烨; 王世坤; 曾胜
Original assignee: Hainan Susheng Biotechnology Co ltd
Current assignee: Hainan Susheng Biotechnology Co ltd
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2021-05-07

Abstract

The invention provides a novel interface screw, comprising an interface screw main body, and the interface screw main body includes a screw tail, a screw head and a threaded body in the middle; the screw head and the screw tail are connected to form a whole through the threaded body; the screw head and the screw There are cavities on the tail, and the cavities on the screw head and the screw tail communicate with the inner cavity of the threaded body along the axial direction of the interface screw body to form a hollow hole of the interface screw body, and the hollow hole of the interface screw body is set to be adjustable. The contour matched with the external screwdriver; the tooth groove of the threaded body is hollow, and there are several main body support blocks scattered on the tooth groove to connect adjacent screw teeth, and hollow holes are formed between the adjacent main body support blocks on the same tooth groove . The hollow hole formed by the threaded body and the main body support block of the present invention can facilitate the rapid growth of bone in the interface screw and increase the fixation effect of the interface screw in the bone tunnel, while the main body support block can increase the strength of the threaded body part, and is easy to screw in .

Description

Novel interface screw

Technical Field

The invention relates to the technical field of medical instruments, in particular to a novel interface screw for fixing an anterior cruciate ligament of a knee joint.

Background

The interface screw is mainly used for fixing the transplanted ligament in a femoral bone tunnel or a tibial bone tunnel in the knee joint anterior cruciate ligament reconstruction operation.

The main body of the traditional interface screw is mostly bullet-shaped, the outer surface is wound with a plurality of circles of threads, and the thread profile is mostly semicircular, trapezoidal, triangular and the like. The thread tooth form is semi-circular, though can effectively avoid transplanting the ligament and receive too big shearing action and lead to the ligament to break at the in-process of interface screw in, nevertheless difficult the fixing in bone tunnel has great risk of droing, leads to the operation failure. The thread profile is triangular and although effective for fixation in bone tunnels, excessive shearing tends to cause ligament rupture. The thread tooth shape is a trapezoid interface screw tooth shape which is commonly used recently, the problem that the thread has shearing effect on transplanted ligaments and the fixing strength is compensated to a certain extent can be solved, but the fixing strength is still insufficient, and the interface screw still has the risk of falling off.

At present, the structure for fixing the interface screw is generally provided with a plurality of blind holes on the outer surface so as to induce the bone ingrowth around the bone passage after the implantation and solve the problem of postoperative loosening. However, the blind holes are too small, the fixing effect is weak, the blind holes are too large, and the thread structure is damaged, so that the screwing is difficult.

Disclosure of Invention

In view of the above, the present invention provides a novel interface screw, which solves the problem of stability improvement caused by the provision of a blind hole in the prior art, and the interface screw according to the present invention directly cancels the provision of the blind hole, and sets the hollow-out shape between the threads of the thread body, and further sets the main body support block between the adjacent threads to enhance the stability.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the utility model provides a novel interface screw, includes interface screw main part, interface screw main part includes the screw thread body at screw afterbody, screw head and middle part, the first end of the screw thread body twines in screw head surface, the second end of the screw thread body connect in the screw afterbody, form a whole through the screw thread body with screw head and screw afterbody connection.

The alveolus between adjacent spiral teeth on the thread body is hollow, and is equipped with a plurality of main part supporting shoes dispersedly on the alveolus in order to connect adjacent spiral teeth, forms the fretwork hole on same alveolus between the adjacent main part supporting shoe, and the fretwork hole is convenient for the bone to be quick at the inside growth of interface screw, increases the fixed action of interface screw in bone tunnel, need not additionally to set up the blind hole. Furthermore, each tooth socket is provided with three main body supporting blocks in a circle, and the positions of the main body supporting blocks on the adjacent tooth sockets are staggered.

Cavities are formed in the head part and the tail part of the screw, and the cavities in the head part and the tail part of the screw are communicated with the inner cavity of the thread body along the axial direction of the interface screw body to form hollow holes of the interface screw body.

The hollow bore of the interface screw body is configured to be contoured to match an external screwdriver. The hollow hole is provided with a contour for matching with a special screwdriver. And also facilitates bone growth.

Preferably, the profile of the hollow hole comprises a plurality of convex edges and grooves between adjacent edges, wherein the edges forming the profile of the hollow hole on the screw body are formed by protruding the inner side surface of the main body supporting block, and the edges on the screw body are aligned with the edges of the tail part of the screw and the head part of the screw.

Preferably, the body supporting block is a columnar structure with a triangular-like cross section, and the diameter of the outer curved surface of the body supporting block is equal to the maximum diameter of the screw head.

Preferably, the profile of the hollow bore comprises five ribs and five grooves, the grooves being arranged obliquely in the direction of rotation of the screw.

Preferably, the tail part of the screw is cylindrical, and the diameter of the tail part of the screw is smaller than or equal to the maximum diameter of the thread body, so that the aim of reducing the resistance of final screwing is fulfilled.

Preferably, the pitch of the thread body is gradually reduced from the head of the screw to the tail of the screw, so that the thread of the interface screw body is sparse to dense from the head to the tail. Furthermore, the distance between the threads close to the head of the screw is larger, so that the shearing effect on the transplanted ligament is reduced, the distance between the threads close to the tail of the screw is smaller, and the fixing effect in a bone tunnel is increased.

Preferably, the thread shape of the thread body is not isosceles trapezoid, and the base angle α of the trapezoid corresponding to the tail side of the screw is larger than the base angle β of the trapezoid corresponding to the head side of the screw. The base angle alpha of one side of the trapezoid, corresponding to the tail part of the screw, is 45-95 degrees, and the base angle beta of one side of the trapezoid, corresponding to the head part of the screw, is 30-60 degrees. When the bottom angle alpha of one side of the tail part of the screw corresponding to the trapezoid is larger than 90 degrees, the tooth-shaped surface of the screw tooth of the screw body is in an inward inclined shape, and the screw tooth can play a role similar to an inverted buckle when the interface screw is screwed in after the ligament is transplanted, so that the fixing effect of the interface screw in the bone tunnel is improved.

The invention has the beneficial effects that:

the blind hole does not need to be additionally arranged, the bone can grow in the interface screw rapidly through the hollow hole formed by the thread body and the main body supporting block, the fixing effect of the interface screw in a bone tunnel is increased, the strength of the thread body part can be increased through the main body supporting block, and the screwing-in is convenient. The thread of the thread body can not generate overlarge shearing force when the screw is screwed in, ligaments can not be damaged, the thread shape of the thread body is in an unequal waist trapezoid shape, the fixation of the interface screw in a bone tunnel can be increased, and particularly when the base angle alpha is larger than 90 degrees, the screw can be fixed in the bone tunnel more strongly under the action of the back-off action generated by the thread.

Drawings

FIG. 1 is a schematic structural view of an interface screw according to the present invention;

FIG. 2 is a schematic cross-sectional view A-A of an interface screw of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a schematic perspective view of an interface screw according to the present invention;

FIG. 5 is a rear view of the interface screw of the present invention;

fig. 6 is a schematic view of the thread shape of the thread body when the back-off action is generated.

In the figure: 1-an interface screw body; 11-screw head; 12-a threaded body; 121-screw teeth; 122-alveolus; 123-a body support block; 124-hollow holes; 13-screw tail; 14-a hollow bore; 141-edge; 142-groove.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1-5, the interface screw according to the present invention includes an interface screw body 1, wherein the interface screw body 1 includes a screw head 11, a screw tail 13 and a middle screw body 12, a first end of the screw body 12 is wound around an outer surface of the screw head 11, a second end of the screw body 12 is connected to the screw tail 13, and the screw head 11 and the screw tail 13 are connected to form a whole through the screw body 12.

The thread groove 122 between the adjacent threads 121 on the thread body 12 is hollowed, a plurality of main body supporting blocks 123 are dispersedly arranged on the thread groove 122 to connect the adjacent threads 121, a hollowed hole 124 is formed between the adjacent main body supporting blocks 123 on the same thread groove 122, the bone can grow in the interface screw rapidly through the hollowed hole 124, the fixing effect of the interface screw on a bone tunnel is increased, and no blind hole needs to be additionally arranged.

In a preferred embodiment, three body support blocks 123 are provided for each turn of the socket 122, and the body support blocks 123 on adjacent sockets 122 are staggered with respect to each other, i.e., the body support blocks 123 correspond to the hollow holes 124 in front of and behind the body support blocks 123, rather than to the body support blocks 123 in adjacent sockets 122.

Cavities are arranged on the screw head part 11 and the screw tail part 13, and the cavities on the screw head part 11 and the screw tail part 13 are communicated with the inner cavity of the thread body 12 along the axial direction of the interface screw main body 1 to form a hollow hole 14 of the interface screw main body 1.

The hollow bore 14 of the interface screw body 1 is configured to be contoured to match an external screwdriver. The hollow bore 14 is profiled for use with a special screwdriver. And also facilitates bone growth.

The contour of the hollow hole 14 includes a plurality of raised ribs 141 and grooves 142 between adjacent ribs 141, wherein the ribs 141 forming the contour of the hollow hole 14 on the screw body 12 are formed by protruding the inner side surface of the body support block 123, and the ribs 141 on the screw body 12 are aligned with the ribs 141 of the screw head 11 and the screw tail 13.

The main body supporting block 123 is a columnar structure with a triangular-like cross section, and the diameter of the outer curved surface of the main body supporting block is equal to the maximum diameter of the screw head 11.

In a preferred embodiment, the profile of the hollow bore 14 comprises five ribs 141 and five grooves 142, the grooves 142 being arranged obliquely in the direction of rotation of the screw.

The tail part 13 of the screw is cylindrical, and the diameter of the tail part is smaller than or equal to the maximum diameter of the thread body 12, so that the aim of reducing the resistance of final screwing is fulfilled.

The pitch of the thread of the screw body 12 is gradually reduced from the screw head 11 to the screw tail 13, so that the thread of the interface screw body 1 is sparse to dense from the beginning to the end. Furthermore, the distance between the threads close to the head part 11 of the screw is larger, so that the shearing effect on the transplanted ligament is reduced, and the distance between the threads close to the tail part 13 of the screw is smaller, so that the fixing effect of the screw in the bone tunnel is increased.

The thread 121 of the screw body 12 has a non-isosceles trapezoid shape, and the base angle α of the trapezoid corresponding to the screw tail 13 is greater than the base angle β of the trapezoid corresponding to the screw head 11. The base angle alpha of one side of the trapezoid, corresponding to the screw tail part 13, is 45-95 degrees, and the base angle beta of one side of the trapezoid, corresponding to the screw head part 11, is 30-60 degrees.

In addition, as shown in fig. 6, when the base angle α of the trapezoid corresponding to the screw tail 13 is greater than 90 °, the thread of the thread 12 has an inwardly inclined surface, and the thread 121 performs a back-off function when the interface screw is screwed in after the ligament is transplanted, thereby increasing the fixation function of the interface screw in the bone tunnel.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A novel interface screw, comprising an interface screw body (1), the interface screw body comprising a screw head (11), a screw tail (13) and a threaded body (12) in the middle; the threaded body (12) The first end of the screw is wrapped around the outer surface of the screw head (11), the second end of the screw body (12) is connected to the screw tail (13), and the screw head (11) and the screw tail are connected by the screw body (12). (13) connected to form a whole;

Both the screw head (11) and the screw tail (13) are provided with cavities, and the cavities on the screw head (11) and the screw tail (13) are along the axial direction of the interface screw main body (1) and the threaded body. The inner cavity of (12) is communicated to form the hollow hole (14) of the interface screw body (1), and the hollow hole (14) of the interface screw body (1) is set to a contour that can be matched with an external screwdriver;

It is characterized in that: the tooth grooves (122) between the adjacent screw teeth (121) on the threaded body (12) are hollowed out, and a plurality of main body support blocks (123) are scattered on the tooth grooves (122) to connect adjacent ones. The screw teeth (121) form hollow holes (124) between adjacent main body support blocks (123) on the same tooth socket (122).

2 . The novel interface screw according to claim 1 , wherein the outline of the hollow hole ( 14 ) includes several raised edges ( 141 ) and grooves ( 142 ) between adjacent edges ( 141 ). 3 .

3. The novel interface screw according to claim 2, characterized in that: the outline of the hollow hole (14) comprises five edges (141) and five grooves (142), the grooves (142) being in the direction of screw rotation Tilt up setting.

4. The novel interface screw according to claim 2 or 3, characterized in that: the rib (141) forming the outline of the hollow hole (14) on the threaded body (12) is a convex inner surface of the main body support block (123). The rib (141) on the threaded body (12) is aligned with the rib (141) of the screw head (11) and the screw tail (13).

5. The novel interface screw according to claim 2 or 3, characterized in that: the main body support block (123) is a columnar structure with a triangular-like cross-section, and the diameter of the outer curved surface is equal to the maximum diameter of the screw head (11). diameters are equal.

6. The new interface screw according to claim 1, characterized in that: the screw tail (13) is cylindrical, and its diameter is smaller than or equal to the maximum diameter of the thread of the threaded body (12).

7. The novel interface screw according to claim 1, characterized in that: the thread pitch of the threaded body (12) gradually decreases in the direction from the screw head (11) to the screw tail (13), so that the interface screw main body ( 1) The thread is from sparse to dense from the beginning to the end.

8. The novel interface screw according to claim 1, characterized in that: the tooth shape of the thread (121) of the threaded body (12) is an isosceles trapezoid, and the bottom corner of the trapezoid corresponds to one side of the screw tail (13) The angle α is greater than the base angle β corresponding to the side of the screw head (11).

9. The novel interface screw according to claim 8, characterized in that: α is 45-95°.

10. The novel interface screw according to claim 8, characterized in that: β is 30-60°.