CN2429129Y

CN2429129Y - Double thread hollow pressing screw

Info

Publication number: CN2429129Y
Application number: CN 00227827
Authority: CN
Inventors: 刘少喻
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-04-12
Filing date: 2000-04-12
Publication date: 2001-05-09
Anticipated expiration: 2010-04-12

Abstract

The utility model relates to a double thread hollow pressing screw which is exclusively used for the internal fixation of a tooth-shaped fracture. The utility model is composed of a head section, a body section and a tail section. The utility model is a hollow screw. A head end is provided with a self-tapping three-blade opening, which is good for leading the utility model to be screwed in a bone. A tail end forms a cross shape and is concave, which is good for leading the screw to be screwed by a cross-shaped screwdriver. The head section and the tail section are respectively a screw part. The screw pitch of the head section is 0.5 mm wider than the screw pitch of the tail section. The outer diameter of the tail section is 1.0 mm bigger than the outer diameter of the head section. After the screw is screwed, a fracture end can be really pressurized, which is good for the fixation and the union of a tooth-shaped convex fracture.

Description

The double thread compressive hollow screw

This utility model relates to a kind of medical internal fixation implantation material, and particularly a kind of preceding road internal fixation screw that is specifically designed to fresh [odontoid fracture belongs to medical device product.

The [odontoid fracture is a kind of more critical illness, can cause the high-order paralysis of patient, even respiratory center is impaired.Difficulty is bigger in the treatment.Treatment in the past adopts expectant treatment or first and second cervical vertebra of the way of escape to fix more, and the former therapeutic effect is not good enough, and the latter not only surgical injury is big, and the cervical vertebra swing of postoperative patient is few more than 40%.Domestic in recent years minority large hospital has been carried out preceding road Odontoid process internal fixation, and operation wound is little, and postoperative does not influence the cervical vertebra function substantially.Adopt this operation to need a kind of special fixture--screw thread compressive hollow screw.

The purpose of this utility model is to provide a kind of internal fixation pressurization effect more certain stable titanium alloys Odontoid process internal fixation screw.

This utility model mainly is achieved through the following technical solutions.

This utility model mainly is made up of for three sections head, body and tail.Section is thread segment end to end, but the pitch of head section is than the wide 0.5mm of rear, and the rear external diameter is the many 1.0mm of head section.Head end is a trident self tapping cutting edge, and tail end is " ten " word matrix, and body Duan Weiyuan cartridge type, screw are hollow type.

Screw is hollow is convenient to be inserted in the location guide pin, accurately is screwed in the Odontoid process.Be positioned at the fracture near-end after head threads is screwed into, afterbody is positioned at far-end, and pitch difference end to end is beneficial to the near-end of will fracturing when twisting screw and draws over to one's side and pressurize to far-end, is beneficial to union of fracture.The pressurization of tail end " ten " fracture end is more certain and stable.

Nail is different and be divided into A, B, three specifications of C according to length, and three's head, rear are all identical, and body section difference only can be selected the screw of different length according to the needs of performing the operation.

Fig. 1 is this utility model structure cut-away view;

Fig. 2 is this utility model head end (trident cutting edge) sketch map (left view);

Fig. 3 is this utility model tail end " ten " word concave port sketch map (right view).

Among Fig. 1,1. head of screw section, 2. body of screw section (being body), 3. screw rear;

Among Fig. 2,4. screw head end trident self tapping cutting edge;

Among Fig. 3,5. screw tail end " ten " word concave port.

Further specify it below in conjunction with accompanying drawing.

This utility model screw is made up of head section 1, body 2 and rear 3, and screw is the hollow (see figure 1) of double thread; Screw left end (head end) is a self tapping trident cutting edge (see figure 2); Screw right-hand member (tail end) adopts " ten " word concave port structure (see figure 3).

Screw is made of titanium alloy material.

This utility model is novel, and is rational in infrastructure, safe and reliable effectively simple in the use.It is a kind of novel extraordinary medical device product.

Claims

1, a kind of double thread compressive hollow screw that is made of head section, rear and body is characterized in that the head of hollow screw, rear are screw thread, and body is a smooth garden column, and major axis central authorities are hollow.

2, double thread compressive hollow screw according to claim 1 is characterized in that head section pitch than the wide 0.5mm of rear, and the rear external diameter is the big 1.0mm of head section; Whole screw is made by the titanium alloy metal.

3, double thread compressive hollow screw according to claim 1 is characterized in that the hollow screw head end is self tapping three cutting edges, and tail end is " ten " word matrix.