CN101332116B

CN101332116B - Spinal crest elastic internal fixation device

Info

Publication number: CN101332116B
Application number: CN2008100295498A
Authority: CN
Inventors: 靳安民; 陈远明
Original assignee: Southern Medical University
Current assignee: Southern Medical University
Priority date: 2008-07-18
Filing date: 2008-07-18
Publication date: 2011-05-04
Anticipated expiration: 2028-07-18
Also published as: CN101332116A

Abstract

The invention discloses an inner elastic fixer of vertebral spinous process. The fixer comprises a U-shaped elastic strip (1) and a U-shaped clip (2) arranged at both sides of the U-shaped elastic strip. The invention is characterized in that lateral wings (3) are arranged at both sides of the bottom of the U-shaped elastic strip (1) respectively, the lateral wings (3) extend along the negative direction of a U-shaped opening and a tapping screw hole (5) is arranged on each lateral wing (3). The invention fastens a fixed bolt on the upper spinous process and the lower spinous process by the U-shaped clip and adopts the tapping screw hole to fix the lateral wing on a vertebral lamina at the root of the spinous process, thus greatly reducing force acting on the spinous process so as to improve the stability of fixing and effectively prevent the fracture and incision of the spinous process.

Description

Spinal crest elastic internal fixation device

Technical field

The present invention relates to a kind of vertebra elasticity inner fixer, this holder is applicable to treatment lumbar spinal stenosis and shakiness.

Background technology

In traditional vertebrae disease, except outside the injury that caused of injury of the bone folding, the vertebra degeneration is a common cause.The spinal segments shakiness that degenerative lumbar causes makes the unusual and spinal canal stenosis of local stress, one of the pain mechanism that causes that this unusual stress distribution and spinal canal stenosis are considered to low back pain.Lumbar spinal stenosis and lumbar instability are usually gone hand in hand, and pipe narrows down because lumbar instability has quickened lumbar vertebra, and lumbar vertebral posterior decompression operation regular meeting again damages the lumbar vertebra posterior column structure and increased the weight of lumbar instability.At present the operation method of the above-mentioned disease of treatment mainly is that the canalis spinalis posterior decompression adds bone-graft fusion and adds the rigidity internal fixation again, the operation wound of this Therapeutic Method is big, the operability complexity, technology and equipment conditional request height especially also may produce conversion syndrome (or claiming the neighbouring section disease).For addressing the above problem, the technical staff has developed various elasticity inner fixers.

For example, publication number is that the application for a patent for invention of CN 1681444A discloses a kind of " back vertebra supporting component ", this assembly is by being supported in adjacent two interspinal elasticity wedges up and down, be located at respectively that the curved side compression member on the vertebra is fixed at the elasticity wedge left and right sides and two and the drive disk assembly that is located between described elasticity wedge and the curved side compression member is formed, under the effect of human motion, when two spinous process when the centre is drawn close, two spinous process force the axially interior contraction of described elasticity wedge, bulging radially outward, this bulging power is transmitted to the curved side compression member by drive disk assembly, its counteracting force radially reacts on the both sides of elasticity wedge, thereby produces damping action and stop up and down two spinous process further to be drawn close to the centre; Otherwise, when two spinous process outwards separate, the curved side compression member of the left and right sides just has the trend that is straightened and inwardly draw at the middle part, and then produce horizontal force compressing elasticity wedge by drive disk assembly and extend axially, strut up and down two spinous process, promptly vertebra up and down between the two segment deformation force be converted to elasticity wedge axial deformation power and strut spinous process up and down by the curved side compression member of both sides.This shows that the described technical scheme of CN 1681444A application for a patent for invention can enlarge canalis spinalis and intervertebral foramina, alleviate the nerve root in the oppressed nerve root canal, still, this device remains in the structure check, and manufacturing technology requires high deficiency.

Have, the American-European technical staff of medical circles also develops the interspinous process implant of some treatment lumbar spinal stenosiss, as Coflex (Bono, Christopher M.MD again; Vaccaro, Alexander R.MD.Interspinous Process Devices in the Lumbar Spine.J Spinal Disord Tech2007; 20:255-261.).This implant is based on a U-shaped flexure strip, establishes respectively in its both sides that a U card constitutes.During operation, the back of U-shaped flexure strip main body is embedded at up and down between two spinous process of therapentic part towards vertebral plate, is stuck in up and down on the spinous process and available bolting of crossing spinous process is lived by the U card of both sides.Above-mentioned implant utilize the elastic elasticity of U-shaped to make up and down two spinous process have the trend of outside separation, have flexible fastening and advantage of simple structure simultaneously.Yet, since the sclerotin intensity of spinous process itself a little less than, and all strength all concentrates on the spinous process, so easy generation fracture of spinous process and spinous process caused cutting.For avoiding the problems referred to above to take place, often adopt the way of not using bolting clinically, but the implant contradiction that fixedly dynamics is not enough, implant easily gets loose occurs.Although the development person of above-mentioned implant is provided with some small embossments and U card inboard, both sides is designed to zigzag at U-shaped flexure strip external side of main body face its product, attempt to utilize set little protruding and zigzag to increase adhesion between itself and the spinous process, avoiding implant to get loose, but facts have proved still and can not overcome above-mentioned deficiency.

Summary of the invention

In view of there is above-mentioned deficiency in prior art, the purpose of this invention is to provide a kind of modified model spinal crest elastic internal fixation device, this elasticity inner fixer is not only fixing firm, and can effectively avoid taking place fracture of spinous process.

The present invention realizes that the technical solution of above-mentioned purpose is:

A kind of spinal crest elastic internal fixation device, this holder comprises a U-shaped flexure strip and is located at the U-shaped card of its both sides respectively, the both sides that it is characterized in that described U-shaped flexure strip bottom are respectively equipped with a flank, and this flank extends towards the opposite direction of U word opening, and each flank is provided with a tapping screw hole.

Spinal crest elastic internal fixation device of the present invention, wherein said flank can directly extend to form to the opposite direction (downwards) of U word opening at the dual-side of U-shaped flexure strip, also can outwards be formed to the bottom that the opposite direction (downwards) of U word opening extends to the U word after the turnover respectively by the dual-side of U-shaped flexure strip again.When described flank by the side of U-shaped flexure strip outwards after the turnover again when the bottom that the opposite direction of U word opening extends to the U word forms, described U-shaped card can be located on the flank of U-shaped flexure strip both sides, and is positioned at the top in described tapping screw hole.

Spinal crest elastic internal fixation device of the present invention, the arc of the root of wherein said U-shaped card for outwards arching upward, this arc has damping action, can alleviate the impact of external force to spinous process, more effectively avoids fracture of spinous process and spinous process to be cut the generation of phenomenon.

Technique scheme of the present invention, two flanks opposite have been set up on the basis of existing technology with U word opening direction, and offer a tapping screw hole at described each flank, therefore described U-shaped flexure strip has just increased by two fixing points, promptly be fixed on up and down the supraspinous tapping screw hole that utilizes simultaneously and flank be fixed on the vertebral plate of spinous process root using the U-shaped card to wear set bolt, thereby reduced to act on supraspinous strength greatly, both improve fixed stability, and also effectively avoided fracture of spinous process and spinous process to be cut the generation of phenomenon.

Description of drawings

Fig. 1～3 are the structural representation of a kind of specific embodiment of the present invention, and wherein Fig. 1 is a front view, and Fig. 2 is a vertical view, and Fig. 3 is a left view.

Fig. 4 is the expanded view of Fig. 1～3 illustrated embodiments, and dotted line is stamping-out and turn-line among the figure.

The structural representation of the another kind of specific embodiment of Fig. 5～7 the present invention, wherein Fig. 5 is a front view, and Fig. 6 is a vertical view, and Fig. 7 is a left view.

Fig. 8 is the expanded view of Fig. 5～7 illustrated embodiments, and dotted line is a turn-line among the figure.

Fig. 9 and Figure 10 are the user mode sketch map of Fig. 1～3 illustrated embodiments, and wherein Fig. 9 is a front view, and Figure 10 is a right view; Vertebrae is represented in double dot dash line among Fig. 9 and Figure 10.

Figure 11 and Figure 12 are the user mode figure sketch map of Fig. 5～7 illustrated embodiments, and wherein Figure 11 is a front view, and Figure 12 is a left view; Vertebrae is represented in double dot dash line among Figure 11 and Figure 12.

The specific embodiment

Referring to Fig. 1～3, U-shaped flexure strip 1 and two U-shaped cards 2 and two flanks 3 are made by titanium alloy plate punching press as shown in Figure 4.Referring to Fig. 4, flexure strip 1 is bent to form by the A portion among the figure, and two U-shaped cards 2 are turned up relatively by the B portion at two and formed, and two flanks 3 are dug relatively by C portion hollow out again and formed.Directly act on the spinous process and cause fracture of spinous process, the arc (seeing Fig. 2 and Fig. 3) that the root bending that described U-shaped card 2 is connected with U-shaped flexure strip 1 becomes outwards to arch upward for fear of external force.Referring to Fig. 1～3 and in conjunction with Fig. 4, but the bolt hole 4 on the two U-shaped cards 2 be washed into when the punching press with the tapping screw hole 5 on two flanks 3, also can after drawing, be processed into separately.

After making spinal crest elastic internal fixation device 6 by Fig. 1～3, just can fix with reference to Fig. 9 and Figure 10, concrete fixing means is as described below: the U-shaped flexure strip 1 that inwardly compresses spinal crest elastic internal fixation device 6 earlier, make its U font dehisce to diminish, then its back of the body is placed up and down between two spinous process 8 of joint that need treatment towards vertebrae 7, adjust the position, make two flanks 3 extend vertebral plate under two spinous process, 8 roots up and down, two U-shaped cards 2 are cancelled external force to spinous process 8 cards up and down within it respectively, the dual-side of U-shaped flexure strip 1 just opens two spinous process 8 is up and down strutted slightly, at last with bolt hole 4 and tapping screw hole 5 for drawing the hole, punching construction bolt 9 on two spinous process 8 up and down, punching is installed tapping screw 10 fix tightlies and is got final product on the vertebral plate under spinous process 8 roots.

Also can outwards be extended to form downwards after the turnover by the side of U-shaped flexure strip 1 referring to Fig. 5～7, two flanks 3, two U-shaped cards 2 are located at respectively on the flank 3 of U-shaped flexure strip 1 both sides, and are positioned at the top in tapping screw hole 5 again.Present embodiment also is to be made by titanium alloy plate punching press as shown in Figure 8, and wherein, flexure strip 1 is bent to form by a portion among the figure, and two U-shaped cards 2 are turned up relatively by the b portion at two and formed, and two flanks 3 are formed by the turnover of c portion.Manufacture method beyond Fig. 5～7 illustrated embodiments are above-mentioned is identical with above-mentioned Fig. 1～3 illustrated embodiments.

The installation of Fig. 5～7 illustrated embodiments can be installed with reference to the method for above-mentioned Fig. 1～3 illustrated embodiments in conjunction with Figure 11 and Figure 12.

Claims

1. spinal crest elastic internal fixation device, this holder comprises a U-shaped flexure strip (1) and is located at the U-shaped card (2) of its both sides respectively, the both sides that it is characterized in that described U-shaped flexure strip (1) bottom are respectively equipped with a flank (3), this flank (3) extends towards the opposite direction of U word opening, and each flank (3) is provided with a tapping screw hole (5).

2. a kind of spinal crest elastic internal fixation device according to claim 1 is characterized in that described flank (3) directly extends to form to the opposite direction of U word opening at the dual-side of U-shaped flexure strip (1).

3. a kind of spinal crest elastic internal fixation device according to claim 1 is characterized in that described flank (3) is outwards formed to the bottom that the opposite direction of U word opening extends to the U word after the turnover respectively by the dual-side of U-shaped flexure strip (1) again.

4. according to the described a kind of spinal crest elastic internal fixation device of one of claim 1～3, it is characterized in that the arc of root for outwards arching upward of described U-shaped card (2).