CN213787736U

CN213787736U - Universal half-thread self-tapping screw for orthopedic external fixation and external fixation device

Info

Publication number: CN213787736U
Application number: CN202021285771.7U
Authority: CN
Inventors: 姜伟
Original assignee: Pingshan People's Hospital Of Sichuan Province
Current assignee: Pingshan People's Hospital Of Sichuan Province
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-07-27
Anticipated expiration: 2030-07-03

Abstract

The utility model discloses an universal half-thread self-tapping screw of orthopedics external fixation usefulness relates to medical auxiliary instrument technical field, has universal pivoted nut at any time, is convenient for align the opening on a plurality of screw lateral walls, does not need the mode of rethread adjusting screw to make the opening on the lateral wall align, and concrete scheme is: the screw comprises a functional end positioned outside the cavity and a connecting end positioned in the cavity, the inner diameter of the nut cavity is larger than the outer diameter of the screw connecting end, and the caliber of the opening of the nut cavity is smaller than the outer diameter of the screw connecting end; the upper end of the nut is provided with a groove with a thread on the inner wall, and the clamp and the piece are in threaded connection with the groove. The nut of the universal half-thread self-tapping screw for orthopedic external fixation can rotate universally, so that the orientation of the opening on the side wall of the nut can be conveniently adjusted, and a rod can be conveniently placed; the half-thread universal self-tapping screw adopts half-threads and has the advantage of less damage to bones and soft tissues.

Description

Universal half-thread self-tapping screw for orthopedic external fixation and external fixation device

Technical Field

The utility model relates to the technical field of medical auxiliary equipment, more specifically say, it relates to an universal half-thread self-tapping screw of orthopedics external fixation usefulness.

Background

The clinical practice of open fracture caused by direct or indirect violence usually adopts an external fixing bracket for fixation after reduction. In the fixing process, a half-thread fixing needle is generally used for fixing, a tapping process needs to be added on a cortical bone part, and a connecting rod needs to be placed after the fixing on the needle is assisted by a connector.

In the prior art, it is necessary to align the openings of a plurality of screws for rod placement, and to align the openings of a plurality of screws, the screws that have been fixed in the bone are again turned to achieve this. This can cause further twisting of the screw once it has been secured, which can cause greater damage to the bone and can again disrupt the fixation of the screw, with some instability.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides an orthopedic external fixation uses universal half thread self-tapping screw has universal pivoted nut at any time, is convenient for align the opening on a plurality of screw lateral walls, does not need the mode of rethread adjusting screw to make the opening on the lateral wall align.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a universal half-thread self-tapping screw for orthopedic external fixation comprises a screw, a screw cap and a fastener, wherein the lower end of the screw cap is provided with a cavity with an opening at the bottom; the upper end of the nut is provided with a groove with a thread on the inner wall, and the clamp and the piece are in threaded connection with the groove.

In above-mentioned scheme, the link of screw is located the nut all the time, and screw and nut can not break away from, and the relative screw of nut can carry out universal rotation to adjust nut upper end lateral wall open-ended orientation, a plurality of screws of being convenient for are fixed through the stick. When using, the screw function end is fixed in entering into the bone through the self tapping mode, and the screw connection end can adopt hexagon socket head's shape, is convenient for attack the bone with the screw through appurtenance, then adjusts nut lateral wall open-ended orientation, places the stick in the recess, then will block with a piece and the nut recess is turned round tightly, fixes the stick.

Preferably, the screw has a thread length of 1/3 to 1/2 of the length of the functional end of the screw. After the screw is inserted into the bone, the thread of the screw is used for fixing, and the part at the upper end of the screw is not provided with the screw, so that the injury of the screw to the bone can be reduced.

Preferably, the pitch of the threads of the screw is greater at the functional end of the screw remote from the screw cap than at the functional end of the screw cap. The screw is convenient to insert into the bone due to the large distance between the tips of the threads, and the screw is convenient to fix due to the small distance between the threads and the end close to the nut.

As a preferred scheme, the top of the nut cavity is provided with an opening, the bottom of the nut cavity is provided with a first opening, the top of the cavity is provided with a second opening, and the second opening is positioned at the bottom of the nut groove; the length of the screw connecting end is greater than that of the nut cavity, and the outer diameter of the screw functional end close to the first opening of the nut is greater than the caliber of the first opening. The rod is convenient to be connected, the screw and the nut are relatively fixed by compressing the screw through the rod, and the relative rotation force is not generated any more.

Preferably, the screw connecting end has a portion protruding from the cavity on the side close to the nut groove, the outer surface of the screw is provided with a thread, and the inner wall of the nut cavity is provided with a connecting thread groove matched with the thread on the portion. The universal rotation of the nut of being convenient for, through lifting the nut then wrench movement, can be so that nut and screw relatively fixed, no longer need the pressure of stick, fixed effect is better.

The utility model provides an outer fixing device for bone surgery, includes foretell orthopedics external fixation uses universal half thread self-tapping screw, still includes the connective bar, and the connective bar is placed in the nut recess and is carried out the card through card and piece and with.

To sum up, the utility model discloses following beneficial effect has:

(1) the universal half-thread self-tapping screw nut for orthopedic external fixation provided by the utility model can rotate universally, so that the orientation of the opening on the side wall of the nut can be adjusted conveniently, and the bar can be placed conveniently;

(2) the universal half-thread self-tapping screw for orthopedic external fixation provided by the utility model adopts half-threads, and has the advantage of less damage to bones and soft tissues;

(3) the universal half-thread self-tapping screw for orthopedic external fixation provided by the utility model can self-lock the screw cap and the screw again, so that the screw cap and the screw are fixed relatively again;

(4) the utility model provides an universal half-thread self-tapping screw of orthopedics external fixation usefulness simple structure, excellent in use effect has fine economic nature and practicality.

Drawings

Fig. 1 is a schematic structural view of a screw and a nut according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a universal half-thread self-tapping screw for orthopedic external fixation according to an embodiment of the present invention;

wherein:

1. a screw; 2. a nut; 3. a card and a piece; 4. a groove; 5. a first opening; 6. a second opening; 7. a rod; 11. a functional end; 12. and a connecting end.

Detailed Description

This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.

The terms in upper, lower, left, right and the like in the description and the claims are combined with the drawings to facilitate further explanation, so that the application is more convenient to understand and is not limited to the application.

A universal half-thread self-tapping screw 1 for orthopedic external fixation comprises a screw 1, a screw cap 2 and a fastener 3, wherein the lower end of the screw cap 2 is provided with a cavity with an opening at the bottom, the screw 1 comprises a functional end 11 positioned outside the cavity and a connecting end 12 positioned in the cavity, the inner diameter of the cavity of the screw cap 2 is larger than the outer diameter of the connecting end 12 of the screw, and the caliber of the opening of the cavity of the screw cap 2 is smaller than the outer diameter of the connecting end 12 of the screw; the upper end of the nut 2 is provided with a groove 4 with a thread on the inner wall, and the clamping piece 3 is in threaded connection with the groove 4.

In above-mentioned scheme, the link 12 of screw 1 is located nut 2 all the time, and screw 1 and nut 2 can not break away from, and nut 2 can carry out universal rotation relative to screw 1 to adjust the open-ended orientation of nut 2 upper end lateral wall, be convenient for a plurality of screws 1 fix through stick 7. When using, screw function end 11 enters into the bone through the self tapping mode and fixes, and the shape of hexagon socket head can be adopted to screw link end 12, is convenient for attack the bone with screw 1 through appurtenance, then adjusts 2 lateral wall open-ended orientations of nut, places stick 7 in recess 4, then twists with card and 3 and nut recess 4 tightly, fixes stick 7.

Preferably, the screw 1 has a thread length of 1/3 to 1/2 of the length of the functional end 11 of the screw.

In the above scheme, in some cases, the screw 1 needs to be inserted deeply into a bone, and the part inserted into the bone adopts threads, so that each layer of threads can cause damage to the bone; after the screw 1 is inserted into the bone, the thread of the screw 1 is used for fixation, and the part at the upper end of the screw 1 is not provided with the screw 1, so that the injury of the screw 1 to the bone can be reduced. In the part that stretches into the bone, the screw that is close to most advanced is used for the tapping to stretch into the bone and fixed, and the screw 1 of keeping away from most advanced does not give up the screw thread, just can reach the appointed degree of depth for screw 1, can effectively reduce the injury number of times of screw thread to the bone.

Preferably, the pitch of the threads of the screw 1 at the functional end 11 remote from the nut 2 is greater than the pitch of the threads at the functional end 11 close to the nut 2.

In the scheme, the distance between the threads is large, the length of the screw 1 penetrating into the bone is long when the screw 1 rotates for one circle, the distance between the tips of the threads is large, so that the screw 1 can penetrate into the bone conveniently, and the distance between the threads close to the end of the nut 2 is small, so that the screw 1 can be fixed conveniently.

As a preferable scheme, the top of the cavity of the screw cap 2 is provided with an opening, the bottom of the cavity of the screw cap 2 is provided with a first opening 5, the top of the cavity is provided with a second opening 6, and the second opening 6 is positioned at the bottom of the screw cap groove 4; the length of the screw connecting end 12 is larger than that of the cavity of the screw cap 2, and the outer diameter of the screw functional end 11 close to the first opening 5 of the screw cap 2 is larger than the caliber of the first opening 5.

In the preferred solution described above, the rod 7 defines the recess 4 of the nut 2, so that the nut 2 cannot rotate, and then, in the vertical direction, presses the screw 1, so that the rotation between the nut 2 and the screw 1 is more difficult, so that after connecting the rod 7, the screw 1 is pressed by the rod 7, fixing the screw 1 and the nut 2 relatively, without having a relative rotational force.

Preferably, the screw connection end 12 has a portion protruding from the cavity near the nut groove 4, the outer surface of the screw 1 is provided with a thread, and the inner wall of the cavity of the nut 2 is provided with a connection thread groove matching with the thread on the portion.

In the scheme, the length of the external thread of the screw 1 protruding out of the cavity is longer, the nut 2 can rotate at least one circle relative to the screw 1, the direction of the side wall opening of the nut 2 is not influenced, and the screw 1 does not need to be twisted again to cause damage to bones again; when being convenient for the universal rotation of nut 2, through lifting up nut 2 then the wrench movement, can be so that nut 2 and screw 1 relatively fixed, no longer need the pressure of stick 7, fixed effect is better. The fixing effect of this mode is better than the pressing mode of the rod 7, and the relative rotation of the nut 2 and the screw 1 can be completely blocked.

The utility model provides an outer fixing device for bone surgery, includes foretell orthopedics external fixation uses universal half thread self-tapping screw 1, still includes connective bar 7, and connective bar 7 is placed and is carried out the card and with 3 through the card and with in nut groove 4.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. The universal half-thread self-tapping screw (1) for orthopedic external fixation is characterized by comprising a screw (1), a screw cap (2) and a clamping piece (3), wherein the lower end of the screw cap (2) is provided with a cavity with an opening at the bottom, the screw (1) comprises a functional end (11) positioned outside the cavity and a connecting end (12) positioned in the cavity, the inner diameter of the cavity of the screw cap (2) is larger than the outer diameter of the screw connecting end (12), and the caliber of the opening of the cavity of the screw cap (2) is smaller than the outer diameter of the screw connecting end (12); the upper end of the nut (2) is provided with a groove (4) with a thread on the inner wall, and the clamp (3) is in threaded connection with the groove (4).

2. Universal half-thread self-tapping screw (1) for orthopaedic external fixation according to claim 1, characterised in that the length of the thread of said screw (1) is 1/3 to 1/2 of the length of the functional end (11) of the screw.

3. Universal half-thread self-tapping screw (1) for orthopaedic external fixation according to claim 2, characterised in that the pitch of the threads of the functional end (11) of the screw (1) remote from the nut (2) is greater than the pitch of the threads of the functional end (11) close to the nut (2).

4. Universal half-thread self-tapping screw (1) for orthopaedic external fixation according to claim 1, characterised in that said nut (2) has an opening at the top of the cavity, the bottom of the cavity of the nut (2) is a first opening (5), the top of the cavity is a second opening (6), the second opening (6) is located at the bottom of the nut groove (4); the length of the screw connecting end (12) is greater than that of the cavity of the screw cap (2), and the outer diameter of the screw functional end (11) close to the first opening (5) of the screw cap (2) is greater than the caliber of the first opening (5).

5. A universal half-thread self-tapping screw (1) for orthopaedic external fixation according to claim 4, wherein said screw attachment end (12) has a portion protruding from the cavity on the side close to the nut groove (4), the outer surface of the screw (1) is provided with threads, and the inner wall of the cavity of the nut (2) is provided with a connection thread groove matching the threads on the portion.

6. An external fixation device for orthopedic surgery, characterized in that it comprises several universal half-thread self-tapping screws (1) for orthopedic external fixation according to any one of claims 1 to 5, and a connecting rod (7), wherein the connecting rod (7) is placed in the nut groove (4) and clamped by the clamping piece (3).