CN215228297U

CN215228297U - Elastic anti-drop screw

Info

Publication number: CN215228297U
Application number: CN202121056639.3U
Authority: CN
Inventors: 刘志礼; 张钰; 刘家明; 李安安; 刘觐; 刘子豪; 颜金祥; 周婉晴; 程兴
Original assignee: First Affiliated Hospital of Nanchang University
Current assignee: First Affiliated Hospital of Nanchang University
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2021-12-21
Anticipated expiration: 2031-05-18

Abstract

The utility model belongs to the technical field of medical instruments, in particular to an elastic anti-drop screw, which comprises a far-end hollow screw body, a middle bending part and a near-end hexagonal screw cap which are connected into a whole, wherein the near-end hexagonal screw cap and the far-end hollow screw body are both provided with threads; the elastic connecting column and the pressing tube are further included, the middle bending portion is provided with an accommodating groove, pressing holes communicated with the accommodating groove are formed in the upper portion of the middle bending portion and the hexagonal nail caps at the near ends, the outer side wall of the pressing tube is connected with the pressing holes in a sliding mode, the inner side wall of the pressing tube is connected with the elastic connecting column in a sliding mode, and the upper end of the pressing tube extends out of the hexagonal nail caps at the near ends; the elastic connecting column in the containing groove is sleeved with a pressure spring, and four elastic connecting columns are uniformly distributed in the axial direction of the middle bending part. The utility model provides an elasticity anticreep screw bending effect is good to can keep crooked state, can guarantee to become stable healing of fracture department skeleton.

Description

Elastic anti-drop screw

Technical Field

The utility model belongs to the technical field of medical instrument, especially, relate to an elasticity anticreep screw.

Background

The screw can achieve the purpose of fixing the bone at the fracture position by virtue of threads which can be closely meshed with bone, and in recent years, the minimally invasive screw intramedullary fixation treatment technology based on the screw is widely popularized and applied clinically, and has the advantages of small wound, quick fracture healing, low medical cost and the like.

The screw used for the minimally invasive screw intramedullary fixation treatment technology can be divided into a straight screw and an elastic bolt, wherein the elastic screw can be bent along the fracture joint and is particularly suitable for fixing irregular bones of human bodies such as pelvis, clavicle and the like. For example, the chinese utility model patent with the publication number CN210095889U discloses a universal elastic hollow tension screw, which comprises a screw body, wherein a front end screw body and a tail end connector are respectively arranged at two ends of the screw body; the screw body is provided with a guide pin through hole along the axis direction, and two ends of the guide pin through hole respectively protrude out of the end surfaces of the front screw body and the tail end connector; the screw body is provided with a spiral gap communicated with the guide pin through hole in a penetrating manner, and the spiral gap extends along the axis direction of the screw body.

The applicant finds that in long-term clinical application, the universal elastic hollow tension screw provided by the patent can conform to the bending of the fracture joint, but still has the following problems: the universal elastic hollow tension screw provided by the patent is difficult to keep in a bending state at a fracture joint, so that the bone at the fracture joint is unstable.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can keep crooked state, can guarantee the stable elasticity anticreep screw that heals of fracture department skeleton.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

an elastic anti-drop screw comprises a far-end hollow screw body, a middle bent part and a near-end hexagonal screw cap which are integrally connected, wherein threads are arranged on the near-end hexagonal screw cap and the far-end hollow screw body;

the elastic connecting column and the pressing pipe can be sleeved on the upper portion of the elastic connecting column, a containing groove is formed in the middle bending portion, pressing holes communicated with the containing groove are formed in the upper portion of the middle bending portion and the near-end hexagonal screw cap, the upper end of the middle bending portion extends into the pressing holes, the lower end of the elastic connecting column is fixedly connected with the middle bending portion at the containing groove, the outer side wall of the pressing pipe is connected with the pressing holes in a sliding mode, the inner side wall of the pressing pipe is connected with the elastic connecting column in a sliding mode, and the upper end of the pressing pipe extends out of the near-end hexagonal screw cap;

a compression spring is sleeved on the elastic connecting column in the accommodating groove, the length of the accommodating groove is larger than or equal to the natural length of the compression spring along the direction of the central line of the middle bending part, and the compression spring is positioned in the middle of the middle bending part after the compression spring is compressed by the compression pipe; four elastic connecting columns are uniformly distributed in the axial direction of the middle bending part.

The working principle and the beneficial effects of the technical scheme are as follows:

during the use, at first drill the fracture position of skeleton, then put into downthehole through instruments such as bottle opener, spanner, so medical personnel can compress tightly one or two pressing tubes (the part that other pressing tubes stretch out near-end hexagonal head of a nail can adopt instruments such as pliers, scissors to detach) selectively according to the crooked direction of whole elasticity anticreep screw because the axial equipartition of middle part flexion has four elasticity spliced poles, make the compression spring compression in this direction, just can make whole elasticity anticreep screw can carry out arbitrary angle deformation along with the marrow lacuna, can keep crooked state, guarantee into stable healing of fracture department's skeleton.

Preferably, the hexagonal socket hole is formed in the hexagonal nail cap at the near end, so that the insertion of the guide needle is facilitated.

Preferably, the middle bending part is internally provided with a cavity, and the technical scheme can further facilitate the bending of the middle bending part.

Preferably, the longitudinal section of the pressing tube is of an inverted T-shape. This technical scheme can be favorable to compressing tightly the pressure spring on the pipe compression elasticity spliced pole.

Preferably, still including being used for the fixed cap that compresses tightly of pressing the pipe position, this technical scheme helps carrying on spacingly to compressing tightly the pipe, and whole elasticity anticreep screw can keep crooked state, guarantees the stable healing of fracture department's skeleton.

Drawings

Fig. 1 is a longitudinal sectional view of an embodiment of the present invention;

fig. 2 is a top view of an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion A of FIG. 1;

FIG. 4 is an enlarged view of a portion of FIG. 1 at B;

fig. 5 is a sectional view of fig. 1 taken along the direction C-C with the compression spring removed.

Reference numerals in the drawings of the specification include: the novel hollow nail comprises a near-end hexagonal nail cap 1, a middle bent part 2, a far-end hollow nail body 3, an inner hexagonal hole 4, a pressing pipe 5, an elastic connecting column 6, a pressure spring 7, an accommodating groove 8, a cavity 9 and a pressing cover 10.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The embodiment is basically as shown in the attached figures 1-5: an elastic anti-drop screw comprises a far-end hollow screw body 3, a middle bent part 2 and a near-end hexagonal screw cap 1 which are connected integrally, wherein threads are arranged on the near-end hexagonal screw cap 1 and the far-end hollow screw body 3.

The hollow nail body 3 at the far end, the bent part 2 at the middle part and the hexagonal nail cap 1 at the near end are internally provided with communicated cavities 9, the cavities 9 are communicated with the hexagonal socket holes 4, and the hexagonal socket holes 4 communicated with the cavities 9 are arranged on the hexagonal nail cap 1 at the near end, so that the penetration of a guide needle is facilitated. The circumference of the middle bending part 2 is provided with a containing groove 8, and the containing groove 8 is positioned in the middle of the compression pipe 5.

As shown in fig. 3, this embodiment still includes elastic connection post 6 and can cup joint the pressing pipe 5 on elastic connection post 6 upper portion, all open the hole that compresses tightly with the 8 intercommunications of storage tank in the upper portion of middle part flexion 2 and the near-end hexagonal head of a nail 1, the upper end of middle part flexion 2 stretches into and compresses tightly downtheholely, the lower extreme of elastic connection post 6 and the 2 body coupling of middle part flexion of storage tank 8 department, compress tightly the lateral wall of pipe 5 and compress tightly hole sliding connection, compress tightly inside wall and the 6 sliding connection of elastic connection post of pipe 5, the upper end of pressing pipe 5 stretches out from near-end hexagonal head of a nail 1.

As shown in fig. 3, the longitudinal section of the pressing pipe 5 is inverted T-shaped.

Being in and having cup jointed pressure spring 7 on the elastic connection post 6 in storage tank 8, along the central line direction of middle part flexion 2, storage tank 8's length is no less than pressure spring 7 natural length, specifically, as shown in fig. 1, storage tank 8's length is a + b, compresses tightly the back, and the length of pressure spring 7 is b, compresses tightly pipe 5 and compresses tightly pressure spring 7 back, and pressure spring 7 is in the middle part of middle part flexion 2 (the dotted line in fig. 1 is the central line of middle part flexion 2, also is the central line after pressure spring 7 compresses tightly). As shown in fig. 5, four elastic connection columns 6 are uniformly distributed in the axial direction of the middle bending part 2.

The embodiment further comprises a pressing cover 10 used for fixing the position of the pressing pipe 5, a bobbin is integrally connected to the proximal hexagonal nail cap 1, and the pressing cover 10 is in threaded connection with the bobbin. The length a in fig. 1 and the length a in fig. 4 are both the downward movement distance of the pressing pipe 5.

The specific implementation process is as follows:

when the anti-falling screw is used, firstly, a hole is drilled at a bone fracture part, then the whole elastic anti-falling screw is placed in the hole through instruments such as a screwdriver, a wrench and the like, and as the four elastic connecting columns 6 are uniformly distributed in the axial direction of the middle bending part 2, medical workers can selectively compress one or two compression tubes 5 according to the bending direction of the whole elastic anti-falling screw, and the parts of the rest compression tubes 5 extending out of the near-end hexagonal screw cap 1 can be removed through instruments such as a pair of pliers, a pair of scissors and the like, so that the compression spring 7 in the specific direction of the elastic anti-falling screw is compressed, the whole elastic anti-falling screw can deform at any angle along with a marrow cavity, and meanwhile, the bending state is kept, and stable healing of the bone at the fracture part is ensured. After the pressing, the pressing cover 10 is adopted to limit the pressing pipe 5.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. An elastic anti-drop screw is characterized by comprising a far-end hollow screw body (3), a middle bent part (2) and a near-end hexagonal screw cap (1) which are integrally connected, wherein threads are arranged on the near-end hexagonal screw cap (1) and the far-end hollow screw body (3);

the elastic connecting column is characterized by further comprising an elastic connecting column (6) and a pressing pipe (5) which can be sleeved on the upper portion of the elastic connecting column (6), a containing groove (8) is formed in the middle bent portion, pressing holes communicated with the containing groove (8) are formed in the upper portion of the middle bent portion (2) and the near-end hexagonal nail cap (1), the upper end of the middle bent portion (2) stretches into the pressing holes, the lower end of the elastic connecting column (6) is fixedly connected with the middle bent portion (2) at the containing groove (8), the outer side wall of the pressing pipe (5) is in sliding connection with the pressing holes, the inner side wall of the pressing pipe (5) is in sliding connection with the elastic connecting column (6), and the upper end of the pressing pipe (5) stretches out of the near-end hexagonal nail cap (1);

a compression spring (7) is sleeved on the elastic connecting column (6) in the accommodating groove (8), the length of the accommodating groove (8) is larger than or equal to the natural length of the compression spring (7) along the central line direction of the middle bending part (2), and the compression spring (7) is positioned in the middle of the middle bending part (2) after the compression spring (7) is compressed by the compression pipe (5); four elastic connecting columns (6) are uniformly distributed in the axial direction of the middle bending part (2).

2. The elastic anti-drop screw according to claim 1, wherein the hexagonal socket hole (4) is formed on the hexagonal socket head cap (1).

3. The elastic anti-drop screw according to claim 1 or 2, characterized in that a cavity (9) is opened in the middle bent part (2).

4. Elastic anti-drop screw according to claim 1 or 2, characterized in that the longitudinal section of the compression tube (5) is of inverted T shape.

5. Elastic anti-drop screw according to claim 3, characterized in that the longitudinal section of the compression tube (5) is of inverted T shape.

6. The elastic anti-drop screw according to claim 1, 2 or 5, further comprising a compression cap (10) for fixing the position of the compression tube (5).

7. The elastic anti-drop screw according to claim 3, further comprising a compression cap (10) for fixing the position of the compression tube (5).

8. The elastic anti-drop screw according to claim 4, further comprising a compression cap (10) for fixing the position of the compression tube (5).