CN2474098Y

CN2474098Y - Internal fixing system for vertebral column resetting

Info

Publication number: CN2474098Y
Application number: CN 01219614
Authority: CN
Inventors: 谭明生
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-04-16
Filing date: 2001-04-16
Publication date: 2002-01-30
Anticipated expiration: 2011-04-16

Abstract

The utility model relates to an internal fixing device having a bar and screw structure for vertebral column resetting, which is suitable for resetting internal fixing operations of human body's vertebral column bone fracture dislocation, slippage and malformed pedicle of vertebral arch and is mainly formed by combining steel bars and screws. The utility model is characterized in that the butt ends of pulling up resetting screws are made into U-shaped open grooves and annular pre-fracture cutting marks. The device has the advantages of simple structure, stable fixing and convenient operation, malformed vertebral columns can be pulled up and reset just by screwing screws without using pulling up resetting auxiliary devices, and the screw tail can be broken off from the annular pre-fracture cutting mark at the screw tail after the resetting effect is satisfactory. The utility model can reduce operation time, and can reduce patient's operation exposure and doctor's labor intensity.

Description

The universal spinal internal fixation system that resets

This utility model is a kind of human spine's of being used for fracture dislocation, slippage and the odd-shaped pedicle internal fixation device that resets.

At present, the clinical design that is used for pedicle restoring backbone internal fixation device is various, but can reduce two classes: a class is that the screw thread rod iron adds bolt structure, with the USS system is representative, its advantage is to have three dimensions to regulate the fixed function that resets, the compression of the spinal fixation that can reset effectively, lordosis, the protruding and rotation displacement in back.Its shortcoming is to lift to reset to need to lift the nail chuck by instrument of lifting or interpolation, and with the instrument of lifting, just can finish and lift reset operation, so its complex structure, parts are many, and complex operation step, patient's surgical exposure time is long.Another kind of is that steel plate adds bolt structure, is representative with the STEFFEE system, and its advantage is simple in structure, and parts are few, fixation.Its shortcoming is the no vertical distraction reduction function of such apparatus itself, often need in the art by platform down the traction patient reset or reset, so cumbersome operation technique, and often reset effect is not good enough with dilator; The three-dimensional pre-bending difficulty of steel plate is to implanting pedicle nail status requirement height, application difficult in the case of deformity of spine.

The purpose of this utility model is in order to provide a kind of simple in structure, easy to operate to the orthopedist, to reduce patient's surgical exposure time, the pedicle restoring backbone internal fixation device of the nail bar structure type of fixation.

This utility model has adopted two rod irons and 4---12 piece of pedicle screw.See accompanying drawing and description of drawings for details.Be that example illustrates making of the present utility model, operation principle and using method with a kind of internal fixation that resets that is used for human body fourth lumbar vertebra spondylolisthesis below.

The building block of the restoring backbone internal fixation device of this specification is as follows: (1) rod iron: select for use medical titanium alloy to make two rod irons of the same form, and the long 65mm of rod iron, diameter 6mm, its head end 3mm length is the prismatic structures of 4 * 4mm.(2) lift the screw that resets: 2 of the same form, long 85mm, its leading portion 40mm, diameter 6mm makes the cancellous bone screw style, pitch of thread 3mm, degree of depth 0.75mm.Back segment 45mm, diameter 10mm, nail thickness transition region is made the ramped shaped of long 5mm, the butt end fluting 6.5 * 38mm of nail, the nearly center-side of groove is the garden arc of diameter 6.5mm, fluting takes the shape of the letter U, the nearly center-side of this groove is the half garden arc that adapts with the rod iron diameter, and bottom land is made matsurface; The outer regular screw threads of making M10 * 1 specification of nail; Above the butt end nut of screw, make the dark annular pre-break incisura of 1mm apart from the butt end 33mm place of nail.(3) plain screw: long 52mm, with lift the screw that resets remove the pre-break incisura with top after, intact identical.(4) nut: make thickness 3mm, the hexagonal (hexagon)nut that adapts with the regular screw threads of M10 * 1 specification.

The utlity model has through spinal column " three posts " and strut the function that lifts the internal fixation that resets and be easy to the pre-bending rod iron to adapt to the characteristics of backbone correcting.Its operation principle is as follows: (1) struts pincers and compresses to clamp to finish by use and strut and compression function.(2) the rod iron middle part can be pre-bent to the angle that adapts to backbone correcting, is generally the 5-10 degree, helps to recover the physiology curvature of spinal column, more meets the biomechanics requirement.(3) lift effect: titanium rod is embedded in the tail end fluting that lifts nail, screws in nut, screw is upwards lifted, when screw lift put in place after, the nail tail that fractures finishes lifting operation.

During use, by prior art 4 pedicle screws are inserted in L4, the L5 vertebra respectively, respectively put a rod iron about spinal column, rod iron is inserted in L4, the L5 screw fluting, and then the nut of L5 vertebra is tightened fixed L 5 vertebras and rod iron.Be screwed into the nut that lifts nail on the L4 vertebra this moment again, lifts by screw the L4 vertebra is resetted, and lifts to reset when satisfied tightening nuts, folding end nail tail.Because rod iron pre-bending 5--10 degree so L4, L5 prevertebral part are slightly opened, recovers spinal column physiology curvature, meets the biomechanics requirement.Bone-graft fusion is sewed up the incision then, and art finishes.

Description of drawings:

Fig. 1 this utility model installation diagram

Fig. 2 lifts the screw that resets

Fig. 3 rod iron

1. lift the transverse section that annular pre-break incisura 3. rod irons 4. that the screw 2. that resets lifts the screw butt end that resets lift the screw sectional side elevation 5. nuts 6. plain screws 7. rod iron transverse section 8. screw butt ends that reset among the figure

In Fig. 1,, rod iron (3) and plain screw are fixed as one by the nut (6) of tightening plain screw.Make and lift the screw that resets to moving by tightening the nut (5) that lifts the screw that resets (1), produce and lift reset response perpendicular to rod iron (3) direction.

In Fig. 2, the rod iron transverse section is a garden shape.

In Fig. 3, when lifting after the nail (1) that resets tightens, again from the annular pre-break incisura (2) that lifts the screw butt end that the resets nail tail that fractures.

This utility model except that being applicable to the present case patient, also can be used for human body breast, lumbar vertebra and other sections spinal fracture dislocation, slippage and lopsided equivalent damage and disease orthopedic, reset and fix.What can and strut apart from deciding according to the required fixed sections of spinal column its rod iron length, screw length and screw, make the restoring backbone internal fixation device of various different sizes.

The present invention has following advantage compared with prior art:

1 parts are few, and manufacture technology is simple.

2 is simple in structure, fixed.

3 is easy to operate, need not lift the assistive device that resets, and only needs tightening nuts, gets final product Automatically lift the spinal fixation that resets, can shorten operating time, reduce patient's surgical exposure and reach Doctor's labour intensity.

Claims

A kind of human spine's fracture dislocation that is used for, slippage and odd-shaped excellent pin structure type restoring backbone internal fixation device, it is characterized in that: the leading portion that lifts the screw that resets is made the cancellous bone screw style, back segment is made the U-shaped open slot than the plain screw lengthening, the nearly center-side of this groove is the half garden arc that adapts with the rod iron diameter, bottom land is made matsurface, and nail is outer makes regular screw threads, makes annular pre-break incisura above the butt end nut of screw.