CN2579357Y

CN2579357Y - Lumber vertebrae anastomat

Info

Publication number: CN2579357Y
Application number: CN 02249920
Authority: CN
Inventors: 王建华
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-11-29
Filing date: 2002-11-29
Publication date: 2003-10-15
Anticipated expiration: 2012-11-29

Abstract

The utility model discloses a lumbar vertebra fusion device. A memory alloy supporter is arranged in a casket body. A cover plate presses the memory alloy supporter and covers the casket body. A retreat stopping device is arranged on the cover plate. After the cover plate is supported from the casket body by the memory alloy supporter, the retreat stopping device can stop the cover plate from being pressed down because of pressure. The utility model is a fusion device with variable volume, and can reduce wound when a lumbar vertebra fusion operation is carried, and the insertion is convenient.

Description

Lumbar fusion cages

Technical field

This utility model relates to a kind of artificial lumbar fusion cages.

Background technology

The lumbar instability disease that is caused by a variety of causes more and more comes into one's own in recent years, and it is one of major reason that causes lumbago and skelalgia, also is the unfavorable major reasons of many prolapse of lumbar intervertebral disc surgical effect.The best method of treatment lumbar instability is implemented Lumbar Fusion exactly.The disc removal art progressively develops to the direction of miniaturization, Wicresoftization at present; But the Invasive lumbar fusion device that the fusion under the chamber mirror is auxiliary uses is the common fusion device that routine operation uses, and its volume is bigger, causes operation wound bigger, inserts the comparison difficulty, hardly may if adopt the method for proceeds posterolateral approach to insert.

Summary of the invention

The purpose of this utility model be for provide a kind of can adapt to requirement, the variable volume of proceeds posterolateral approach in the spinal fusion operation, in the time of can reducing the Lumbar Fusion operation wound and insert fusion device easily.

Main technical schemes of the present utility model is: in the casket body of this lumbar fusion cages the memorial alloy supporter is arranged, cover plate is being pressed the memorial alloy supporter, is being covered on the casket body, cover plate is provided with stopping device, after cover plate was propped up from the casket body by the memorial alloy supporter, stopping device can stop cover plate to be depressed because of pressure.

When this fusion device was not worked, volume was small and exquisite, can enter intervertebral space by a very little service aisle of diameter; After this fusion device is inserted in the human body, when temperature during near body temperature, cover plate is propped up from the casket body by the memorial alloy supporter, and stopping device stops cover plate to be depressed because of pressure, fusion device has just been realized strutting and keep working depth automatically like this, thereby satisfies the needs that intervertebral space merges.

Description of drawings

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

Fig. 1 is the duty axonometric chart of this utility model embodiment;

Fig. 2 be this utility model embodiment strut the duty axonometric chart;

Fig. 3 is the structure member partition figure of this utility model embodiment.

The specific embodiment

As Fig. 1, shown in 3, the symmetrically arranged memorial alloy supporter of being made up of two "＜" shape support chips 2 is arranged in the casket body 1 of present embodiment, cover plate 3 is being pressed memorial alloy supporter 2, cover on casket body 1, cover plate 3 is provided with stopping device, described stopping device is that two edge strips 31 that can insert casket body 1 are set in cover plate 3 bottom surfaces, pawl 32 is arranged on the edge strip 31, as shown in Figure 2, after cover plate 3 is propped up from casket body 1 by memorial alloy supporter 2, edge strip 31 can open, and pawl 32 is pressed in casket body 1 edge, makes cover plate 3 by locking, this stopping device can stop cover plate 3 because of pressure is depressed, and keeps working depth.In order to prevent electrolytic etching, used unit all adopts nickel titanium alloy.Offer bone hole 11,33 on the wall of casket body 1, bottom surface and the cover plate 3 respectively, be convenient to osseous tissue and grow into, and prevent that fusion device from withdrawing from; The upper surface of the bottom surface of casket body 1 and cover plate 3 is matsurfaces, can prevent the fusion device slippage equally.

This fusion device volume is small and exquisite, mainly is applicable in the Minimally Invasive Surgery: anterior approach is mainly used in the lumbar spinal fusion of peritoneoscope under auxiliary; Posterior approach is mainly used in the lumbar spinal fusion of proceeds posterolateral approach arthroscope under auxiliary; Also can be used for routine operation, operation wound is littler than general surgery fusion device.In operation process, extract the intervertebral disc of corresponding intervertebral space earlier, strike off cartilaginous lamina, carry out the preparation of fused bone bed; Fusion device of the present utility model is immersed in the brine ice, wherein the edge strip of memorial alloy supporter, cover plate takes place softening, under apparatus helps, the memorial alloy supporter vertically compresses, realize the closure of cover plate and casket body, the fusion device height reduces, volume-diminished, and can insert fusion device this moment with spongy bone or artificial bone skeletal grain, after fusion device is inserted, be beneficial to and induce up and down the osseous tissue of contact surface to grow into, realize that intervertebral space merges; With the fusion device gripper clamp fusion device is inserted in the corresponding intervertebral space then; Introduce 37 degree warm water by service aisle again, make supporter performance shape memory effect, cover plate is fully strutted, and the fusion device height rises, strut to a certain degree after, edge strip 31 ejects and opens, pawl 32 is pressed in casket body 1 edge, makes cover plate 3 by locking, stops cover plate 3 to be depressed because of pressure, keep working depth, satisfy the needs that intervertebral space merges.

Claims

1, a kind of lumbar fusion cages, it is characterized in that: memorial alloy supporter (2) is arranged in the casket body (1), cover plate (3) is being pressed memorial alloy supporter (2), is being covered on casket body (1), cover plate (3) is provided with stopping device, after cover plate (3) was propped up from casket body (1) by memorial alloy supporter (2), stopping device can stop cover plate (3) to be depressed because of pressure.

2, a kind of lumbar fusion cages according to claim 1, it is characterized in that: described stopping device is that two edge strips (31) that can insert casket body (1) are set in cover plate (3) bottom surface, pawl (32) is arranged on the edge strip (31), after cover plate (3) is propped up from casket body (1) by memorial alloy supporter (2), edge strip (31) can open, pawl (32) is pressed in casket body (1) edge, makes cover plate (3) by locking.

3, a kind of lumbar fusion cages according to claim 1 and 2 is characterized in that: memorial alloy supporter (2) is symmetrically arranged two "＜" shape support chips.

4, a kind of lumbar fusion cages according to claim 3, it is characterized in that: used unit all adopts nickel titanium alloy.

5, a kind of lumbar fusion cages according to claim 3 is characterized in that: offer bone hole (11), (33) respectively on casket body (1) and the cover plate (3).

6, a kind of lumbar fusion cages according to claim 3 is characterized in that: the upper surface of the bottom surface of casket body (1) and cover plate (3) is a matsurface.