CN2330320Y

CN2330320Y - Anterior fixer of spine

Info

Publication number: CN2330320Y
Application number: CN 98227365
Authority: CN
Inventors: 钱普健; 林钢; 李德祥; 冯步龙
Original assignee: 钱普健
Priority date: 1998-07-14
Filing date: 1998-07-14
Publication date: 1999-07-28
Anticipated expiration: 2008-07-14

Abstract

The utility model discloses an improved anterior fixer of a spine, which is mainly composed of a fixed steel plate (1) and screws (2), wherein, the fixed steel plate (1) is provided with mutually parallel long grooves (5) which are through grooves. When the utility model is used, the screws (2) are inserted in the long groove (5) of the fixed steel plate and screwed in the spine, and the spine is fixed by the fixed steel plate (1). The fixer not only can bear a compressive load, but also can bear a bending load and a torsional load. The utility model has the advantages of reliable fixation and convenient operation.

Description

The preceding road of a kind of spinal column holder

This utility model belongs to a kind of Orthopeadic Surgery medical device, relates in particular to the fixture of spinal vertebral.

Spinal column is the extremely important parts that human body bears various load, and the tectonic movement of spinal column is very complicated, and is also very harsh to the requirement of spinal operation implantation equipment equally.In recent years, spinal surgery development is very fast, and various spinal fixation equipment occur more, and vertebral body is followed closely in comparatively advanced and representative having, adjustable stick type fixator and Steffee steel plate.The cone spike directly is driven into vertebral body like " staple " during operation, exist the nail foot easily to withdraw from, and is fixing not firm; Directly be driven into the splitting of easy generation vertebral body; Mainly bear compressive load, can not resist bending, torsional deflection; Restoring backbone not exclusively waits not enough.Adjustable stick type fixator system " two nails, one rod " structure, existence is little with the spinal bone contact area, and part is many, mainly bears the human body compressive load, and the effectively rotation of control rod can not be born bending, torsional load.The Steffee holder comprises two screws and a single cavity steel plate, though contact area makes moderate progress, but still is the distortion of " two nail one rod " structure.Therefore, existing spinal fixation device has only formed a kind of " line is fixed " to spinal column, can only support the axial compression load of human body, and for sagittal forward and backward the bending and stretching of human body, the left and right lateral bending of frontal plane, the control ability of the twist motion of horizontal plane is relatively poor, especially bear compression, bending, when reversing these combined loads, effect is poorer.This holder also is difficult to realize well resetting of spinal segments simultaneously.Not only directly affect patient's postoperative effect, and easily form secondary damage.

The purpose of this utility model provides the preceding road of a kind of improved spinal column holder, and it can not only bear compression, bending, torsional load and combined load thereof, realizes the three-dimensional fixation to spinal column, and better to restoring backbone, more convenient operation.

The purpose of this utility model is achieved in that on the fixation steel plate of implanting spinal column and has the elongated slot that is parallel to each other that this parallel elongated slot is a groove; During use, be inserted with the screw that is screwed into spinal bone in the parallel elongated slot.

After adopting this structure, owing to have the elongated groove that is parallel to each other on the fixation steel plate, at first make " face is fixed " that being combined into of fixation steel plate and spinal bone is stable, thereby make it to have ideal ability of bearing compression, bending, torsional load and combined load thereof, bearing capacity greatly improves, stop the compression and the displacement of fracture effectively, be more conducive to bony union; Secondly allow the increase of screw number in the parallel slot, it is more reliable that fixation steel plate is connected with spinal bone, fixing better.Owing to have parallel slot on the fixation steel plate, increased steel plate width again, made it to increase with the contact area of spinal bone, footprint pressure reduces, and has improved the ability of spinal bone opposing stress, also can obtain enough constant intensities to osteoporotic gerontal patient; Because have parallel elongated slot on the steel plate, the screw crossheading moves during implantation, not only its length that is connected and fixed can be determined arbitrarily according to patient's characteristics, and the easily adjustment that resets of spinal column, and it is better to reset; Screw can directly be implanted vertebral body through the steel plate groove, and locks with steel plate, and operates and all implement on frontal plane, so operation is simple.

Below in conjunction with the drawings and specific embodiments this utility model is described in further detail.

Fig. 1 is (user mode) cutaway view of a specific embodiments of the preceding road of this utility model spinal column holder;

Fig. 2 is the vertical view of embodiment shown in Figure 1;

Fig. 3 is the screw topology view in the embodiment shown in Figure 1;

Fig. 4 is the vertical view of fixation steel plate in another specific embodiments of holder of the preceding road of this utility model spinal column.

Have the elongated slot 5 that is parallel to each other on the fixation steel plate 1 of Fig. 1, the preceding road of spinal column shown in Figure 2 holder, elongated slot 5 has two pairs and be groove, two pairs of elongated slots that are parallel to each other 5 are in on a pair of parallel lines, all leave at interval in the middle of two segment length's grooves on the same straight line, this structure helps improving the strength and stiffness of fixation steel plate 1.All be inserted with screw 2 in each segment length's groove 5, screw 2 can be in elongated slot moves along its length, so as to reset, the spinal fixation bone.Elongated slot 5 is suitable for reading crescent chamfering 6 obliquely, when and tight screw 2 on nut 3 time, nut 3 just in time falls to being positioned on this crescent moon chamfering 6, makes that the screw 2 on the fixation steel plate 1 both can accurately lock, and has anti-loosing effect again.Fig. 3 provides the topology view of screw 2, the top of the screw 2 in the elongated slot 5 is that common coarse thread can close with nut 3 is stubborn mutually, the upper end of screw 2 is half garden cylindricality tappet head, and this tappet head also can adopt structures such as hexagon, flat mouthful flute profile, so that twist screw; The self-tapping screw structure is adopted in the bottom, so that screw 2 is screwed in the spinal bone; The middle part of screw 2 has a cross section to be The convex piece 4 of shape, the cross section minor axis part of this convex piece 4 is movably by elongated slot 5, and the major diameter part is greater than the width of elongated slot 5, this convex piece 7 turns over 90 ° after partly passing elongated slot 5 along minor axis again during use, the major diameter of convex piece 7 partly is stuck in the downside of fixation steel plate 1, fastening nut 3 can be fixed, and makes the affixed of fixation steel plate 1 and screw 2 become very convenient.

Fig. 4 has provided the fixation steel plate structure of the preceding road of another kind of spinal column holder.Have a pair of elongated slot that is parallel to each other 5 on this fixation steel plate 1, processing and fabricating is comparatively convenient, two sections parallel long slot lengths differ, one section is long than another section, during implantation, can make screw 2 in the groove position of staggering mutually, help reducing of the damage of two screws of same end, strengthen the effect that is located by connecting same joint spinal bone.

Claims

1, the preceding road of a kind of spinal column holder comprises fixation steel plate (1), it is characterized in that: have the elongated slot (5) that is parallel to each other on the fixation steel plate (1), this elongated slot (5) is a groove; Be inserted with screw (2) in elongated slot during use (5).

2, the preceding road of spinal column according to claim 1 holder is characterized in that: have two pairs of elongated slots that are parallel to each other (5) on this fixation steel plate (1), two pairs of elongated slots (5) are on the same parallel lines.

3, the preceding road of spinal column according to claim 1 holder is characterized in that: have a pair of elongated slot that is parallel to each other (5) on this fixation steel plate (1), and two parallel elongated slots are not isometric mutually.

4, according to claim 1, the preceding road of 2 or 3 described spinal columns holder, it is characterized in that: on this elongated slot (5) actinal surface crescent chamfering (6) is arranged.

5, the preceding road of spinal column according to claim 1 holder is characterized in that: the upper and lower part of this screw (2) is respectively the screw thread of two sections decreasing worm-pitch; The middle part has a cross section to be

The convex piece (4) of shape.