CN211911770U

CN211911770U - Dentate convex screw

Info

Publication number: CN211911770U
Application number: CN202020121686.0U
Authority: CN
Inventors: 安平江; 颜海健; 胡茜; 李青; 吴青青
Original assignee: Affiliated Hospital of Guizhou Medical University
Current assignee: Affiliated Hospital of Guizhou Medical University
Priority date: 2020-01-19
Filing date: 2020-01-19
Publication date: 2020-11-13
Anticipated expiration: 2030-01-19

Abstract

The utility model relates to the technical field of medical equipment, in particular to dentate protruding screw. The utility model discloses a locking screw in dentate process screw includes main screw and nail, the hollow setting of main screw and tail end are uncovered, be equipped with the confession on the lateral wall that main screw tail end corresponds locking screw hole in the nail that locking screw passed in the nail, main screw is arranged in putting into dentate process, locking screw is used for in the nail main screw puts into dentate process back, passes from inside to outside locking screw hole in the nail to put into dentate process in, locking screw put into dentate process back in the nail with the contained angle alpha of acute angle is formed between the main screw. The advantages are that: reasonable in design, easy operation can make fracture end pressurization avoid the screw not hard up to move back the nail phenomenon.

Description

Dentate convex screw

Technical Field

The utility model relates to the technical field of medical equipment, in particular to dentate protruding screw.

Background

Dentate process fracture accounts for 7-14% of cervical vertebra compromise, dentate process fracture is divided into three types according to Anderson classification, and the external fixation of type I and type III fracture is with high fusion rate, generally selects conservative treatment, and type II fracture generally recommends the operation treatment, and the operation is feasible and is fixed and fused in the way of hollow nail interior anterior way, and anterior way hollow nail interior fixation has the great advantage to keeping patient's mobility. The problems that the nail is easy to withdraw, the tail cap is too large, the esophagus is damaged and the like exist in the fixation of the front hollow nail screw commonly used by people at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a dentate protruding screw is provided, the effectual defect of overcoming prior art.

The utility model provides an above-mentioned technical problem's technical scheme as follows:

the utility model provides a dentate protruding screw, including main screw and locking screw in the nail, above-mentioned main screw hollow setting and tail end are uncovered, be equipped with the locking screw hole in the nail that supplies above-mentioned locking screw to pass in the nail on the corresponding lateral wall of above-mentioned main screw tail end, above-mentioned main screw is arranged in putting into dentate protruding, above-mentioned locking screw in the nail is used for putting into dentate protruding back, passes above-mentioned locking screw hole in the nail from inside to outside, and puts into dentate protruding, and above-mentioned dentate protruding back of putting into dentate of the nail locking screw and the above-mentioned main screw between form the contained angle alpha of acute angle.

The utility model has the advantages that: reasonable in design, easy operation can avoid the not hard up nail phenomenon of moving back of screw.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Furthermore, alpha is more than or equal to 50 degrees and less than or equal to 70 degrees.

The beneficial effect who adopts above-mentioned further scheme is that angle reasonable in design for main screw and nail in the locking screw difficult emergence of back main screw condition of moving back of mutually supporting.

Furthermore, the tail end of the main screw is arranged in a countersunk head shape with an expanded mouth.

The beneficial effect of adopting the further proposal is that the tail part of the main screw is completely arranged in the vertebral body when the main screw is arranged in the vertebral body, thereby avoiding damaging the tissue in front of the vertebral body.

Furthermore, the tail end of the main screw is of a conical structure.

The beneficial effects of adopting the above further scheme are that reasonable in design can effectively avoid main screw tail end damage peripheral tissues such as esophagus.

Further, the main screw includes a main screw body, a self-tapping self-drilling screw head and a tail portion integrally formed at both ends of the main screw body, the tail portion constitutes a tail end of the main screw, an outer surface of the main screw body is smooth, a thread is provided on an outer surface of the tail portion, and a pitch of the thread on the outer surface of the screw head is greater than a pitch of the thread on the outer surface of the tail portion.

The beneficial effect of adopting above-mentioned further scheme is that main screwhead tail inequal distance screw thread sets up and can make when main screw gets into, and the fracture broken end is automatic to be pressurized, improves fracture healing rate.

Drawings

Fig. 1 is a schematic structural view of the dentate protruding screw of the present invention;

fig. 2 is a lateral plate of the dentate process screw of the present invention, which is placed into the vertebral body.

In the drawings, the components represented by the respective reference numerals are listed below:

1. main screw 2, locking screw in the nail 11, main screw body 12, screw head 13, screw tail.

Detailed Description

The principles and features of the present invention are described below, with the examples being given only for the purpose of illustration and not for the purpose of limiting the scope of the invention.

Example (b): as shown in fig. 1, the dentate protruding screw of the present embodiment includes a main screw 1 and a central locking screw 2, the main screw 1 is hollow and has an open tail end, a central locking screw hole for the central locking screw 2 to pass through is disposed on a side wall corresponding to the tail end of the main screw 1, the main screw 1 is configured to be placed in the dentate protrusion of the dentate vertebra and the dentate protrusion, the central locking screw 2 is configured to pass through the central locking screw hole from inside to outside after the main screw 1 is placed in the dentate protrusion of the dentate vertebra and is placed in the dentate protrusion of the dentate vertebra, and an acute included angle α is formed between the central locking screw 2 and the main screw after the central locking screw 2 is placed in the dentate protrusion of the dentate vertebra.

The using process is as follows:

as shown in figure 2, the main screw 1 is screwed into the axis and passes through the broken end of the dentate process fracture, after the main screw 1 is placed, the middle nail setting (the matching structure of the locking screw 2 in the nail and the main screw 1) of the tail end hole of the main screw is passed, the locking screw 2 in the middle nail is placed in the dentate process through the middle nail hole of the main screw 1, and the looseness and nail withdrawal of the main screw 1 can be effectively prevented.

As a preferred embodiment, as shown in FIG. 2, α is 50 ° ≦ 70 °.

In the embodiment, the angle design is reasonable, so that the main screw is difficult to withdraw after the main screw and the locking screw in the screw are matched with each other.

Most preferably, α is 60 °.

In some embodiments, the tail end of the main screw 1 is countersunk in a flared shape.

In the embodiment, the tail end of the main screw 1 is arranged in a countersunk head mode, and when the main screw 1 is arranged in a vertebral body, the tail end of the main screw is also completely arranged in the vertebral body, so that the tissues in front of the vertebral body are prevented from being damaged.

In a preferred embodiment, the tail end of the main screw 1 has a frustum-shaped structure.

In the embodiment, the tail end of the main screw 1 is reasonable in shape design, so that the tail end of the main screw 1 can be effectively and completely placed in a vertebral body, and the tissues in front of the vertebral body are prevented from being damaged.

In other embodiments, the tail end of the main screw 1 is countersunk in a flared shape, the main screw 1 includes a main screw body 11, and self-tapping self-drilling screw heads 12 and tail portions 13 integrally formed at both ends of the main screw body 11, the tail portions 13 constitute the tail end of the main screw 1, the outer surface of the main screw body 11 is smooth, the outer surface of the tail portions 13 is provided with threads, and the thread pitch of the outer surface of the screw head 12 is greater than the thread pitch of the outer surface of the tail portions 13.

In the embodiment, the screw head 12 is self-tapping and self-drilling, so that the screw can enter conveniently, and the risk of damaging the spinal cord is reduced; the tail end of the main screw 1 is arranged in a countersunk way, and when the main screw 1 is arranged in a vertebral body, the tail end of the main screw is also completely arranged in the vertebral body, so that the tissues in front of the vertebral body are prevented from being damaged; the head and the tail of the main screw 1 are arranged in an unequal distance, when thick threads (wide thread pitch) on the outer surface of the screw head 12 enter the dentate process fracture part, thin threads (narrow thread pitch) at the tail end of the main screw 1 enter the vertebral body, and the fracture end generates a pressurizing effect due to different thread distances from the threads to the head and the tail along with the continuous entering of the main screw 1, namely, the fracture end is automatically pressurized, and the fracture healing rate is greatly improved.

More specifically, as shown in fig. 2, a denotes a screw tip of the main screw 1 (i.e., the tip of the screw head 12), B denotes a coarse thread (wide pitch) on the outer surface of the screw head 12, C denotes the main screw body 11, D denotes a fine thread (narrow pitch) on the outer surface of the tail portion 13, and E denotes the locking screw 2 in the nail.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A dentate convex screw is characterized in that: including main screw (1) and nail locking screw (2), main screw (1) hollow setting and tail end are uncovered, be equipped with the confession on the lateral wall that main screw (1) tail end corresponds the nail locking screw hole in the nail that locking screw (2) passed in the nail, main screw (1) are arranged in putting into the dentate process of dentate, nail locking screw (2) are used for main screw (1) are put into the dentate process of dentate back, pass from inside to outside the nail locking screw hole to put into the dentate process of dentate, nail locking screw (2) put into the dentate process of dentate back with the contained angle alpha that forms the acute angle between main screw (1).

2. The dentate lug screw of claim 1, wherein: alpha is more than or equal to 50 degrees and less than or equal to 70 degrees.

3. The dentate lug screw of claim 1, wherein: the tail end of the main screw (1) is arranged in a countersunk way in a flaring shape.

4. The dentate lug screw of claim 3, wherein: the tail end of the main screw (1) is of a conical structure.

5. The dentate lug screw as claimed in any one of claims 1 to 4, wherein: main screw (1) include the main screw body (11) and integrated into one piece set up in self-tapping from screwhead (12) and afterbody (13) of boring at main screw body (11) both ends, afterbody (13) constitute the tail end of main screw (1), the main screw body (11) surface is smooth, afterbody (13) surface is equipped with the screw thread, just the pitch of the screw thread of screwhead (12) surface is greater than the pitch of the screw thread of afterbody (13) surface.