CN204520929U

CN204520929U - The spinal column internal fixation device of U-shaped cross-section pitman

Info

Publication number: CN204520929U
Application number: CN201520133699.9U
Authority: CN
Inventors: 蒲兴魏; 罗春山
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-03-10
Filing date: 2015-03-10
Publication date: 2015-08-05
Anticipated expiration: 2025-03-10

Abstract

The utility model discloses the spinal column internal fixation device of U-shaped cross-section pitman, it is made up of pedicle screw, pitman (2) and nut (3), pedicle screw is made up of upper end U-lag and lower end screw (1) again, upper end (U) shape groove is divided into canned paragraph (6) and nail tail (4), has an annular groove mark between canned paragraph (6) and nail tail (4); Upper end U-lag inwall has screw thread, and nut (3) is along this screw threads for fastening pitman (2); It is characterized in that: the cross section of pitman (2) is U-shaped, the bottom shape of upper end U-lag is the U-shaped adapted with pitman (2).This utility model changes cross section circular rod as U-shaped into, adds the contact surface of nut and pitman, thus increases frictional force, effectively anti-rotational, reduces postoperative screw loosening, comes off, the incidence rate of the accident such as parallelogram effect, easy to use.Be applicable to the internal fixtion of spinal surgery posterior spinal.

Description

The spinal column internal fixation device of U-shaped cross-section pitman

Technical field

This utility model relates to surgical instruments, particularly relates to spinal column localizer or regulator, specifically, belongs to spinal column internal fixation device.

Background technology

As everyone knows, pedicle nail bar system is usually used in spinal surgery, as fixing in being applied in the spinal surgeries such as spinal fracture, tumor, regression, slippage.But the nail-stick system of routine is made up of pedicle screw and pitman, pitman cross section is circular rod.The problems such as the pitman of this nail-stick system may occur rotation, postoperative screw loosening, comes off when side is stressed, parallelogram effect, are unfavorable for spinal stabilization.

For increasing the apparatus of internal fixation of spine, some new products are there are, having of correlation technique application Chinese patent: No. CN203693728U " pedicle nail of the treatment spinal tuberculosis of sustainable flushing, drain and nail-stick system ", No. CN203662888U " a kind of head screw and there is the spinal column staple bar system of this head screw ", No. CN203029367U " a kind of pedicle screw fixation system ", No. CN201481532U " the Via Posterior Spinal Approach internal fixation nail rod of band self-locking mechanism " etc.These patented technologies above-mentioned all adopt cross section to be circular pitman, still have that pitman can rotate, screw loosening, the problem such as come off.

Summary of the invention

This utility model aims to provide the spinal column internal fixation device of U-shaped cross-section pitman, to overcome the defect of existing nail-stick system, increase the contact surface of nut and pitman thus increase frictional force, because in screw slots, the plane of rod is parallel with contact surface in screw slots therefore can be anti-rotational, reduce postoperative screw loosening, come off, the incidence rate such as parallelogram effect.

The spinal column internal fixation device of the U-shaped cross-section pitman that designer provides is made up of the pedicle screw of conventional nail-stick system, pitman and nut, pedicle screw is made up of upper end U-lag and lower end screw again, upper end U-lag is divided into canned paragraph and nail tail, have an annular groove mark between canned paragraph and nail tail, fracture after being convenient to surgical menopause nail tail; Upper end U-lag inwall has screw thread, and nut is tightened along this screw thread, thus is fastenedly connected rod; Be different from conventional nail-stick system: the cross section of pitman is U-shaped, and the bottom shape of U-lag is the U-shaped adapted with pitman.

Respectively there are two circular lift grooves the both sides of above-mentioned upper end U-lag, are convenient to use when in art, lift resets.

Using method of the present utility model is: the shape of the patient's spinal column fixed as required by pitman makes similar shape; In advance pedicle screw pedicle is squeezed into respectively two vertebral bodys that need fix in spinal operation, then U-lag is put at pitman two ends, nut of screwing on fixes two vertebral bodys, cuts off the nail tail of upper end U-lag, can realize internal fixation of spine.The shape of patient's spinal column that the length of pitman and profile are fixed as required is determined.

The spinal column internal fixation device of U-shaped cross-section pitman of the present utility model, cross section circular rod is changed into U-shaped, add the contact surface of nut and pitman, thus increase frictional force, effectively anti-rotational, reduce postoperative screw loosening, come off, the incidence rate of the accident such as parallelogram effect, easy to use.Be applicable to the internal fixtion of spinal surgery posterior spinal.

Accompanying drawing explanation

Fig. 1 is the structural representation of the spinal column internal fixation device of U-shaped cross-section pitman, and Fig. 2 is its side view.In figure, 1 is lower end screw, and 2 is pitman, and 3 is nut, and 4 is nail tail, and 5 is lift groove, and 6 is canned paragraph.

Detailed description of the invention

Embodiment

As the spinal column internal fixation device of the U-shaped cross-section pitman of Fig. 1, it is made up of pedicle screw, pitman 2 and nut 3, pedicle screw is made up of upper end U-lag and lower end screw 1 again, and upper end U-lag is divided into canned paragraph 6 and nail tail 4, has an annular groove mark between canned paragraph 6 and nail tail 4; Upper end U-lag inwall has screw thread, and nut 3 is along this screw threads for fastening pitman 2; It is characterized in that: the cross section of pitman 2 is U-shaped, the bottom shape of upper end U-lag is the U-shaped adapted with pitman 2.Respectively there are two circular lift grooves 5 both sides of upper end U-lag.

Pedicle of vertebral arch screw staple height is 80mm.Wherein U-lag height in upper end is 25mm, and diameter is 12mm; Lower end screw 1 is highly 55mm, and diameter is 5mm; Canned paragraph 6 is highly 15mm, and nail tail 4 is highly 10mm; Nut 3 is highly 5mm, and diameter is 8mm; The cross-sectional upper part of pitman 2 is rectangle, bottom is semicircle, and rectangle width is 6mm, and semicircle diameter is 6mm.

Claims

1. the spinal column internal fixation device of a U-shaped cross-section pitman, it is made up of pedicle screw, pitman (2) and nut (3), pedicle screw is made up of upper end U-lag and lower end screw (1) again, upper end (U) shape groove is divided into canned paragraph (6) and nail tail (4), has an annular groove mark between canned paragraph (6) and nail tail (4); Upper end U-lag inwall has screw thread, and nut (3) is along this screw threads for fastening pitman (2); It is characterized in that: the cross section of pitman (2) is U-shaped, the bottom shape of upper end U-lag is the U-shaped adapted with pitman (2).

2. spinal column internal fixation device according to claim 1, is characterized in that respectively there are two circular lifts groove (5) both sides of described upper end U-lag.