CN202223326U

CN202223326U - Universal elastic torsion pedicle screw

Info

Publication number: CN202223326U
Application number: CN201120294626XU
Authority: CN
Inventors: 丁亮华; 曹志达
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-08-15
Filing date: 2011-08-15
Publication date: 2012-05-23
Anticipated expiration: 2021-08-15

Abstract

A universal elastic torsion pedicle screw comprises a spinal column fixing bar, a positioning support and a screw. The spinal column fixing bar is mounted on the positioning support, and a center line of the spinal column fixing bar is perpendicular to a center line of the positioning support. The universal elastic torsion pedicle screw is characterized by further comprising a universal elastic torsion spherical nut and a compression nut, inner threads are arranged on the positioning support, the tail of the screw is a ball head, outer planes are arranged on two sides of the ball head, the universal elastic torsion spherical nut is connected with the positioning support in a threaded manner, an inner plane which corresponds to the outer planes on the two sides of the ball head of the screw is disposed on the inner side of the universal elastic torsion spherical nut and is an inclined plane, a hole of the universal elastic torsion spherical nut is smaller than an inner cavity, the screw penetrates through the positioning support, the ball head of the screw is forcedly pressed into the inner cavity of the universal elastic torsion spherical nut, a tiny gap is formed between each outer plane and the inner plane, and the compression nut is connected with the positioning support in a threaded manner and presses the spinal column fixing bar. The universal elastic torsion pedicle screw not only is simple in structure and convenient in use, but also can obviously relieve low back pain of patients.

Description

Universal elastic torsion pedicle nail

Technical field

This utility model relates to medical instruments field, specifically, relates to a kind of universal elastic torsion pedicle nail, is used in the non-fusion technology of lumbar vertebra, promptly in the dynamic stabilization system.

Background technology

In the treatment of the low back pain that causes because of the lumbar vertebra unstability, the invalid patient of non-operative treatment was normally adopted the converged fixed art in the past.LOCATION OF PEDICLE SCREW FIXATION and Invasive lumbar fusion device bone-graft fusion are the most frequently used technology, and fusion rate can reach 90%～100%.Though part patient has obtained successfully to merge, chronic low back pain is not obviously alleviated, and evidence show and increased the load pressure of adjacent segment after merging, thereby causes it to quicken regression.In view of this, scholars have designed multiple lumbar vertebral posterior non-integration fixture, i.e. motorization fixture (dynamic stabilization devices).Motorization is fixed and is called soft fixing or flexible fixing again; Its objective is the spinal motion that guarantees in the controlled range; Change the load pattern of motion segment, and limit the abnormal movement of this sections, can use separately; Also can use simultaneously, to prevent that merging the contingent regression of the adjacent motor unit of sections quickens with strong internal fixation.The motorization fixture mainly is divided into 4 types of the half strong metal inner fixing devices of device for spreading between spinous process, interspinous ligament device, the tough belting of pedicle screw and pedicle screw at present.When realizing the pedicle dynamic stabilization system enforcement non-fusion technology of lumbar vertebra at present, generally be that the rod that connects pedicle nail is improved, as make fine motion rod type, spring type, thin excellent type etc.The shortcoming of these structures is complex structures, uses inconvenient.

Summary of the invention

The purpose of this utility model provides a kind of universal elastic torsion pedicle nail simple in structure, easy to use, and it can make the patient obviously alleviate low back pain.

The technical scheme that realizes above-mentioned purpose is: a kind of universal elastic torsion pedicle nail, comprise spinal fixation rod, positioning support and screw, and the spinal fixation rod is installed on the positioning support; And the centrage of spinal column locating bar and the centrage of positioning pillars are perpendicular, and universal elastic torsion Ball faced nut and clamp nut have female thread on the positioning support; The afterbody of screw is a bulb, and the both sides of this bulb have outerplanar, and universal elastic torsion Ball faced nut is threaded with positioning support; Universal elastic torsion Ball faced nut inboard has and the corresponding inner plane of screw bulb both sides outerplanar; This inner plane is the inclined-plane, and makes that the aperture of universal elastic torsion Ball faced nut is littler than inner chamber, and screw passes positioning support; And the bulb of screw is pressed into the inner chamber of universal elastic torsion Ball faced nut by force; Have minim gap between outerplanar and the inner plane, clamp nut is threaded with positioning support, and clamp nut is pushed down the spinal fixation rod.

Positioning support is a U type bearing, has U type groove on it, and the spinal fixation rod is installed in this U type groove.

The screw surface has plasma-coated or hydroxyapatite coating layer.

After adopting technique scheme; Universal elastic torsion Ball faced nut inboard has and the corresponding inner plane of screw bulb both sides outerplanar; Have minim gap between outerplanar and the inner plane, so be matched in clearance around screw and the sphere spiral shell side, gap length can be controlled according to designing requirement; Like this in human body owing to receive the influence of physical activity power; The bulb of screw can be in positioning support carries out activity in the concave spherical surface of universal elastic torsion Ball faced nut, because the bulb of screw is pressed into the inner chamber of universal elastic torsion Ball faced nut by force, therefore universal elastic torsion Ball faced nut packs tightly effect to screw again; The nail bar of screw can be swung in 8 ° circular cone, has avoided the excessive defective of shaking amplitude.The part that this utility model uses is few, simple in structure, uses very convenient.This utility model is implemented fine motion through changing the universal structure of pedicle nail, thereby reaches the non-fusion of lumbar vertebra, after the corrective surgery success, can obviously slow down low back pain.

Description of drawings

Fig. 1 is the sectional structure sketch map of this utility model;

Fig. 2 is the main TV structure sketch map of the universal elastic torsion Ball faced nut of this utility model;

Fig. 3 is the cross-sectional schematic of Fig. 2;

Fig. 4 is the perspective view of the universal elastic torsion Ball faced nut of this utility model.

The specific embodiment

Below in conjunction with accompanying drawing and embodiment this utility model is done further detailed explanation.

Shown in Fig. 1 ~ 4, a kind of universal elastic torsion pedicle nail comprises spinal fixation rod 3, positioning support 2 and screw 5; Spinal fixation rod 3 is installed on the positioning support 2, and the centrage of the centrage of spinal column locating bar 3 and positioning pillars 2 is perpendicular, universal elastic torsion Ball faced nut 4 and clamp nut 1; Have female thread on the positioning support 2, the afterbody of screw 5 is a bulb, and the both sides of this bulb have outerplanar 5-1; Universal elastic torsion Ball faced nut 4 is threaded with positioning support 2, and universal elastic torsion Ball faced nut 4 inboards have the corresponding inner plane 4-1 with screw bulb both sides outerplanar 5-1, and this inner plane 4-1 is the inclined-plane; And make that the aperture of universal elastic torsion Ball faced nut 4 is littler than inner chamber; Screw 5 passes positioning support 2, and the bulb of screw 5 is pressed into the inner chamber of universal elastic torsion Ball faced nut 4 by force, has minim gap between outerplanar 5-1 and the inner plane 4-1; Clamp nut 1 is threaded with positioning support 2, and clamp nut 1 is pushed down spinal fixation rod 3.

Positioning support 2 is a U type bearing, has U type groove 6 on it, and spinal fixation rod 3 is installed in this U type groove 6.

Screw 5 surfaces have plasma-coated or hydroxyapatite coating layer.Through being provided with plasma-coated or hydroxyapatite coating layer can engage firmly with bone so that screw 5 is squeezed in the bone back.

The use of this utility model is following:

1, installs before this product art as shown in Figure 1, back-out clamp nut 1 with supporting clamp nut spanner erection support 2 in when operation.

2, be inserted in the screw 5 ball head hexagonals with supporting screw wrench, be screwed in the hole of the pedicle of vertebral arch of having accomplished fluently.

3, put into spinal fixation rod 3, the U-lag of putting into spinal fixation rod 3 on the U-shaped bearing 6.

4, be screwed into clamp nut 1 in the erection support 2 with supporting clamp nut spanner, it can be fixed on the spinal fixation rod in the U-lag 6 of erection support 2.

More than after whole process finishes; Spinal fixation rod 3 compacted nuts 1 in the universal fine motion pedicle nail of this moment are pressed in the U-lag 6 of erection support 2; Spinal fixation rod 3 is integral with erection support 2; Because the universal elastic torsion Ball faced nut 4 inner chamber two ends in screw 5 and the erection support 2 are interference fits, be matched in clearance around the side simultaneously, its gap length is controlled according to designing requirement; Like this in human body owing to receive the influence of physical activity power, the sphere of screw can be in bearing carries out activity in the concave spherical surface of Ball faced nut.Again because the bulb of screw is pressed into the inner chamber of universal elastic torsion Ball faced nut by force; Therefore universal elastic torsion Ball faced nut packs tightly effect to screw; The nail bar of screw can be swung (as shown in Figure 1) in 8 ° circular cone, avoided the excessive defective of shaking amplitude.

Claims

1. universal elastic torsion pedicle nail; Comprise spinal fixation rod (3), positioning support (2) and screw (5); Spinal fixation rod (3) is installed on the positioning support (2), and the centrage of the centrage of spinal column locating bar (3) and positioning pillars (2) is perpendicular, it is characterized in that: also comprise universal elastic torsion Ball faced nut (4) and clamp nut (1); Positioning support has female thread on (2); The afterbody of screw (5) is a bulb, and the both sides of this bulb have outerplanar (5-1), and universal elastic torsion Ball faced nut (4) is threaded with positioning support (2); Universal elastic torsion Ball faced nut (4) inboard has and the corresponding inner planes of screw bulb both sides outerplanars (5-1) (4-1); This inner plane (4-1) is the inclined-plane, and makes that the aperture of universal elastic torsion Ball faced nut (4) is littler than inner chamber, and screw (5) passes positioning support (2); And the bulb of screw (5) is pressed into the inner chamber of universal elastic torsion Ball faced nut (4) by force; Have minim gap between outerplanar (5-1) and the inner plane (4-1), clamp nut (1) is threaded with positioning support (2), and clamp nut (1) is pushed down spinal fixation rod (3).

2. universal elastic torsion pedicle nail according to claim 1 is characterized in that: described positioning support (2) is a U type bearing, has U type groove (6) on it, and spinal fixation rod (3) is installed in this U type groove (6).

3. universal elastic torsion pedicle nail according to claim 1 is characterized in that: described screw (5) surface has plasma-coated or hydroxyapatite coating layer.