JPH067836B2 - Spinous spacer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a spinous process spacer for inserting and fixing between expanded spinous processes when performing cervical spinal canal dilation.

[Conventional technology]

Traditionally, laminectomy has been used as a treatment method when paralysis occurs due to compression of the spinal cord due to cervical spinal canal stenosis or ossification of the posterior longitudinal ligament. Scarring of the extramembrane space, instability of the spine, abnormal curvature,
There is a drawback that the ossification of the posterior longitudinal ligament is likely to occur after the operation. Recently, a spinal canal dilatation for reconstructing the vertebral arch has been generally performed.

In this case, a method of inserting and fixing an autologous bone such as an iliac bone has been performed in order to keep the dilated and expanded laminae in the expanded position.

[Problems of conventional technology]

As described above, since orthopedic bones collected from other parts of the ligament are transplanted, the adhesiveness is good, but bone resorption easily occurs, and when bone resorption occurs, decompression by expansion of the spinal canal is performed. It has the drawback of diminishing effectiveness. In most cases, bones were collected from the iliac crest, but since the iliac crest is the origin of the gluteus medius muscle, the gluteus medius weakens the gluteus medius muscle strength. As a result, there is a disadvantage that the muscle balance of the lower limbs is disturbed, and Trendenburg lameness based on Powell's logic is likely to occur.

[Means for solving problems]

In view of the problems as described above, in the present invention, after the spinal canal is expanded, the spinal canal is sufficiently expanded to be expanded, and for the purpose of preventing pressure on nerve tissue, between the vertebral arches longitudinally split at the midline part of the spinous process, the living body. It is configured by inserting a spinous process spacer made of a ceramic body such as alumina, zirconia, or apatite, which has no mechanical damage and has a large mechanical strength.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a spinous process spacer as an example, and the spinous process spacer 1 is made of a ceramic material such as alumina, zirconia, and apatite that is not harmful to human body, and has a substantially tapered block shape. One tooth-shaped unevenness 2 is formed on at least a surface which has the portion 4 and is located between the divided spinous processes and which abuts the bone.

The unevenness 2 is not limited to the one shown in the figure, and may be integrally provided with a plurality of projections. In short, when it comes into contact with bone, the surface shape is such that it can be stably positioned without moving. is there. Reference numeral 3 is a through hole formed in the spinous process spacer 1 made of a ceramic material.

An example of the use mode of the spinous process spacer 1 according to the present invention is shown in FIG. 2. The spinous process spacer 1 is inserted between the bones. The steel wire 5 is inserted into the through hole 3 of FIG. Moreover, the flange 4 allows the spinous process spacer 1 to be fixed at a predetermined position without moving.

〔The invention's effect〕

As described above, according to the present invention, in a spinal canal dilatation performed for spinal cord compression paralysis, the spacer that is inserted between the bones obtained by dividing the spinous process in the median part is made of a ceramic material. Therefore, a space of arbitrary size and shape can be prepared at all times, and since this spacer is not absorbed into bone and has no biological harm, it remains in the bone. Not only does it need to be removed, but it also contributes to human welfare by freeing the patient from the burden of autologous bone collection and avoiding damage to the gluteus medius muscle due to cutting of the iliac crest.

[Brief description of drawings]

FIG. 1 is a perspective view of a spinous process spacer according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a vertebral body showing a state in which the spinous process spacer according to an embodiment of the present invention is attached to a dividing portion of the spinous process. 1: Spinous process spacer 2: Concavo-convex 3: Through hole 4: Flange

Claims (1)

[Claims] 1. A spacer for inserting and arranging into a split portion of a spinous process of a spine, the spacer being formed of a ceramic material such as alumina, zirconia, apatite, and having a substantially tapered block shape. Spinous spacer.