JP2000175944A - Artificial vertebral arch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hardly generate a problem which occurs in a conventional vertebral arch cutting operation, to prevent a bone absorption viewed in one's own bone and to prevent a secondary complaint owing to bone sampling by providing projecting parts on both side surfaces, which are to be embedded in the side projecting base parts of an artificial vertebral arch to be inserted to a vertebral arch cut part and permitting a opposite surface to the vertebra to be a recessed curved surface. SOLUTION: In the usage method of the artificial vertebral arch 10, the vertebral arch including a spinous process is cut and, then, fitting parts to be fitted to the projection parts 14 and 15 of the artificial vertebral arch 10 are formed at the side projection base parts in right and left. Besides, a suture thread through-hole is formed in the right and left arch parts. Then the suture thread is put through the through-hole of the both arch parts and the through-holes 17-20 of the artificial arch 10 and, then, the artificial arch 10 is inserted to the fitting parts formed in the side projection base parts to fit the projection parts 14 and 15 of the artificial vertebral arch 10. Then the suture thread is tied-up, the artificial arch 10 is fixed and the vertebral canal is re-build. Thus, a defect in a rear element is cancelled and the problem is hardly generated, where rear support property is attenuated after the operation or the vertebra is pressurized again or the like which occur in the conventional vertebral arch cut operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an artificial vertebral arch,
In particular, the present invention relates to an artificial vertebra used for laminectomy of the thoracic / lumbar spine.

[0002]

2. Description of the Related Art In the spinal canal of the thoracic or lumbar spine,
Includes nerve tissue called the cauda equina. When a lesion occupying space such as a tumor occurs in the spinal canal of the thoracic / lumbar spine, nervous tissue is compressed, and as a result, symptoms such as lower limb movement and numbness occur.

[0003] As a treatment for such spinal cord and cauda equina disorders, a method of surgically removing a lesion or, when it is difficult to remove the lesion, a method of enlarging a spinal canal is used.

The most commonly used surgical procedure for this purpose is laminectomy. That is, in order to remove the lesion or to open the spinal canal, which is a closed space, to remove the compression applied to the nervous tissue, the vertebral arch including the spinous process is removed.

[0005]

However, in laminectomy, since the lamine protecting the spinal cord and cauda equina is resected, the spinal nerve has no neuroprotective function, resulting in postoperative bleeding, muscle swelling, or Nerve tissue may be damaged again by a subsequent external force or scar from the back of the spine.

[0006] It is an object of the present invention to provide an artificial lamine that can solve the above problems in laminectomy.

[0007]

SUMMARY OF THE INVENTION An artificial lamine of the present invention is an artificial lamine inserted into a resected portion of a lamine. And a surface facing the spinal cord is a concave curved surface.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The artificial lamine of the present invention is inserted into a resected portion of a lamine that has been resected by a laminectomy to reconstruct the posterior element of the spine. Protrusions are formed on both side surfaces of the artificial lamine, and the artificial lamine can be prevented from shifting in the craniocaudal direction by being implanted into the lateral protrusion bases of the left and right vertebrae.

[0009] The artificial vertebral arch of the present invention is characterized in that the surface facing the spinal cord is a concave curved surface. The reason is that the concave curved surface can form the spinal canal larger than the flat surface, so that the re-compression of the spinal cord hardly occurs, which is advantageous. Also, even in the event that the artificial vertebra falls, it is difficult to compress the spinal cord if it has a concave curved surface.

Further, it is preferable that the artificial vertebra of the present invention has a through hole for inserting a suture. By forming the through-hole, the artificial vertebra can be firmly fastened to the vertebra with a suture such as a wire or a silk thread, thereby preventing the displacement in the horizontal direction. In addition, the direction and the number of the through holes are not limited, and may be appropriately determined according to the surgical procedure.

[0011] The artificial vertebra of the present invention comprises alumina, zirconia, hydroxyapatite, calcium phosphate,
It can be made of a ceramic material such as tetracalcium phosphate, a bioactive glass material such as calcium phosphate glass and calcium phosphate crystallized glass, and a metal material such as stainless steel, titanium, and titanium alloy. Especially when composed of bioactive materials such as hydroxyapatite, calcium phosphate, tetracalcium phosphate, calcium phosphate glass, calcium phosphate crystallized glass,
This is preferable because direct bonding with natural bone becomes possible.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments.
FIG. 1 is an explanatory view showing one embodiment of the artificial vertebral arch of the present invention.

The artificial vertebral arch 10 is a block made of calcium phosphate crystallized glass having a concave cylindrical curved surface 11 facing the spinal cord. Protrusions 14 and 15 are formed on both side surfaces 12 and 13.

Further, four through holes 17, 18, 19, 2 from the surface 11 facing the spinal cord toward the surface 16 on the back side.
0 is formed.

Next, a method of using the artificial vertebra having such a configuration will be described with reference to FIG.

First, after the vertebrae including the spinous processes are resected, the projections 1 of the artificial vertebral arch 10 are placed on the bases of the left and right lateral processes 21 and 22.
Forming fitting portions to be fitted with 4 and 15 are formed. Further, a suture insertion hole is formed in the left and right vertebrae.

Subsequently, after the suture A is passed through the insertion holes of both vertebral arches and the through holes 17, 18, 19, and 20 of the artificial vertebral arch 10, the fittings formed at the bases of the lateral projections 21 and 22 are formed. The artificial vertebral arch 10 is inserted so that the protruding portions 14 and 15 of the artificial vertebrae are fitted to the portions.

After that, the suture A is fastened to the artificial
Fix 0 and reconstruct spinal canal.

The artificial vertebral arch of the present invention is not limited to the above-mentioned shape, and various shapes can be selected, for example, as shown in FIG. Can be.

[0020]

By reconstructing the spinal canal using the artificial vertebral arch of the present invention, the defect of the posterior element can be eliminated. For this reason, problems that occur with conventional laminectomy, such as post-operative loss of posterior support, compression of the spinal cord due to invasion of scar tissue, and transmission of posterior impact directly to the spinal cord. Less likely to happen.

In addition, since an artificial material is used, the bone resorption seen in autologous bone does not occur. In addition, since it is not necessary to collect bone, the invasion to the healthy part is eliminated, and secondary complaints due to bone collection can be prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of an artificial vertebral arch of the present invention.

FIG. 2 is an explanatory view showing a use state of the artificial vertebral arch of the present invention.

FIG. 3 is an explanatory view showing another embodiment of the artificial vertebral arch of the present invention.

[Explanation of symbols]

 10, 30 Artificial vertebral arch 11 Surface facing spinal cord 14, 15 Projection 21, 22 Transverse process A Suture

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4C081 AB04 CF011 CF031 CF061 CF121 CF151 CG02 CG03 CG05 DA01 4C097 AA10 BB01 CC05 DD06 DD07 DD08 DD09 DD10 SC10

Claims (1)

[Claims] 1. An artificial vertebra to be inserted into a resected portion of a vertebra, wherein a projection that can be implanted in a lateral projection base of the vertebra is provided on a side surface, and a surface facing the spinal cord is concave. An artificial vertebra, characterized by having a curved surface.