CN201755245U - Dynamic rod for fixing spines - Google Patents

Abstract

A dynamic rod for fixing spines comprises a first rigid rod and a second rigid rod. A containing groove is formed at the end of the first rigid rod; the end of the second rigid is inserted into the containing groove at the end of the first rigid rod and movably connected to the end of the first rigid rod; and an oscillation absorption structure is arranged at the movably connected ends of the first rigid rod and the second rigid rod. The dynamic rod not only can provide stability of lumbar vertebrae, but also can keep mobility of the lumbar vertebrae.

Description

The dynamic rod of spinal column intervertebral fixation

Technical field

This utility model relates to a kind of medical fixedly implanting device, the particularly dynamic rod of spinal column intervertebral fixation.

Background technology

Spinal column intervertebral fixation implant is mainly used in spinal surgery in the orthopaedics: as being fit to being used of nail rod operation, with prevention or slow down the adjacent segment regression; The low back pain that the little articular degeneration of intervertebral causes.Excision causes the interspinal ligaments of pain, alleviates zygapophysial joints pressure, increases the intervertebral foramina height.

In the prior art, the device of intervertebral fixation is and rigidly fixes.

Rigidity is followed closely excellent fixed system: screw is installed on the pedicle of vertebral arch center, and rod can connect by the top that presss from both sides or directly be fixed on pedicle screw system.Entire infrastructure does not exist moving component and range of activity for rigidly fixing.Reach after the nerve compression that causes painful area, the processing of original bony part lose the shakiness of the spinal motion that causes and load-bearing and carry out fixing.But strong is fixing, causes the change of the spinal column line of force of adjacent segment, has increased the motion amplitude of adjacent segment, causes the further regression of adjacent segment.

Summary of the invention

The purpose of this utility model provides a kind of dynamic rod of spinal column intervertebral fixation, and the stability of lumbar vertebra can be provided, and can keep the activeness of lumbar vertebra again.

For reaching above-mentioned purpose, the technical solution of the utility model is:

The dynamic rod of spinal column intervertebral fixation, it comprises, first, second rigid rod, wherein, the end of first rigid rod forms a containing groove; Second rigid rod end is inserted in the containing groove of the first rigid rod end, be movably connected in the end of first rigid rod, and the end that first, second rigid rod flexibly connects is provided with the vibration absorbing structure.

Further, described vibration absorbing structure comprises that the lateral surface of the end that second rigid rod flexibly connects is convexly equipped with a circle convex tendon along circumference, the second rigid rod end, both sides of convex tendon is established a concussion absorbent portion respectively, and fixedly is limited in by packing ring in the containing groove of the first rigid rod end.

Described concussion absorbent portion is a spring washer.

In addition, the containing groove of the first rigid rod end described in the utility model bottom is a cambered surface, and accordingly, the end that second rigid rod flexibly connects is a cambered surface.

This utility model is established the vibration absorbing structure by the end that two rigid rods flexibly connect, and can prevent excellent main body overbending motion, keeps spine axis and arranges, and the quantitatively amplitude of control rod motion is arranged.

Two rigid rods can provide the elastic deformation of opposite both direction pull strength or compression stress, allow to carry out multiaxis to motion, and motional amplitude limits, and the amplitude angle is restricted to 4 degree.

The concussion absorbing structure of this utility model two rigid rods can be restrained compression and stretch live load in the wrong, by three-dimensional controlled fine motion dispersive stress, reduce stress shielding, stimulate and the acceleration intervertebral fusion, protection fixture and adjacent discs have certain activeness, with the change of the power of axial pressure show as allow anteflexion, after stretch, reduce the stress of articuli intervertebrales articular surface, kept the intervertebral foramina height; Identical with common spinal column way of escape internal fixation art formula, but having increased controllable motion, to keep sections stable.Reach and keep intervertebral height, the regression of protection adjacent segment.

The beneficial effects of the utility model

1. the design of this utility model concussion absorbing structure is placed on the centres of two joint vertebral bodys, and the position of intervertebral disc can maintain certain activeness, with the change of the power of axial pressure show as+/-the axial displacement buffer shaft of 0.2mm to pressure; Guarantee the effect of certain support spinal column rear pillar system simultaneously, reduce the stress of articuli intervertebrales articular surface, kept the intervertebral foramina height.

2. allow the bent activity of bending and stretching two aspects+/-2 ° (totals) simultaneously, the conduction that has promptly guaranteed an axle stress be distributed to effectively that rod is gone up and the cone front pillar on, effectively reduce the disconnected excellent possibility of broken nail, stimulated simultaneously to have kept the certain physiological activity of lumbar vertebra.

3. operate simple and easyly, do not need to promote difficulty, reduce those all hidden dangers that cause of operation technique the operation of spinal column nail-stick system, easy to use and accurate, identical with the operation of common nails bar system, when having kept intervertebral height, allow controlled dynamic lumbar vertebra activity;

4. this utility model device is made with titanium alloy, and the material of titanium alloy can guarantee strength of fixation, can keep fabulous biocompatibility again.

Description of drawings

Fig. 1 is the structural representation of this utility model first embodiment;

Fig. 2 is the A portion amplification view of Fig. 1.

The specific embodiment

Referring to Fig. 1, Fig. 2, the dynamic rod of this utility model spinal column intervertebral fixation, it comprises, first, secondrigid rod 1,2, wherein, theend 11 of first rigid rod 1 forms a containing groove 12; Secondrigid rod 2end 21 is inserted in the containing groove 12 of first rigid rod, 1 end, be movably connected in the end of first rigid rod 1, and the end that first, secondrigid rod 1,2 flexibly connects is provided with vibration absorbing structure 3.

Described vibration absorbing structure 3 comprises that the lateral surface of theend 21 that secondrigid rod 2 flexibly connects is convexly equipped with a circle convextendon 211 along circumference, the second rigid rod end, both sides ofconvex tendon 211 is established a concussionabsorbent portion 31,32 respectively, and fixedly is limited in bypacking ring 33,34 in the containing groove 12 of first rigid rod, 1 end.Described concussionabsorbent portion 31,32 is a spring washer.

In addition, containing groove 12bottoms 121 of the first rigid rod end 1 described in the utility model are cambered surface, and accordingly, theend face 212 of theend 21 that secondrigid rod 2 flexibly connects is a cambered surface.

During the operation of conventional spinal nail-stick system, first, secondrigid rod 1,2 is placed and the pedicle nail tops, and closely connected locking.

Claims (4)

1. the dynamic rod of spinal column intervertebral fixation is characterized in that, comprise, and first, second rigid rod, wherein, the end of first rigid rod forms a containing groove; Second rigid rod end is inserted in the containing groove of the first rigid rod end, be movably connected in the end of first rigid rod, and the end that first, second rigid rod flexibly connects is provided with the vibration absorbing structure.

2. the dynamic rod of spinal column intervertebral fixation as claimed in claim 1, it is characterized in that, described vibration absorbing structure comprises that the lateral surface of the end that second rigid rod flexibly connects is convexly equipped with a circle convex tendon along circumference, the second rigid rod end, both sides of convex tendon is established a concussion absorbent portion respectively, and fixedly is limited in by packing ring in the containing groove of the first rigid rod end.

3. the dynamic rod of spinal column intervertebral fixation as claimed in claim 1 is characterized in that, described concussion absorbent portion is a spring washer.

4. the dynamic rod of spinal column intervertebral fixation as claimed in claim 1 is characterized in that, the containing groove bottom of the described first rigid rod end is a cambered surface, and accordingly, the end that second rigid rod flexibly connects is a cambered surface.

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