JPH1033578A - Bone filling material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bone filling material which allows the easy rebuilding of the shapes between the spraorbital margin on the inner side of the skull, the zygomatic bone and the sphenoid bone without the occurrence of problems, such as infection, and problems in appearance after operation at the time of the head closing operation of the craniotomic part formed over the part between the spraorbital margin on the inner side of the skull, the zygomatic bone and the sphenoid bone. SOLUTION: This bone filling material 2 is formed of a calcium phosphate compd. The bone filling material 2 has an inner part 6 constituting the inner side of the skull 4 and an outer part 8 constituting the outer side of the skull 4. This outer part 8 is composed of an outer thin piece 10 which is thin and is formed nearly to a triangular shape. The inner part 6 comprises an inner thin piece 12 having nearly a triangular shape and a rib part 14. The outer thin piece 10 is thin and is formed nearly to the triangular shape. The rib part 14 is bulged and formed from the vertex part 1004 of the outer thin piece 10 toward the vertex 1204 of the inner thin piece 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bone filling material used for repairing the upper orbit of the skull and between the zygomatic bone and the sphenoid bone.

[0002]

2. Description of the Related Art In the field of neurosurgery, various craniotomy and craniotomy operations are performed. In craniotomy surgery, the scalp is first opened to expose the skull. Next, several circular holes are formed in the skull using a special drill according to the size and site of the craniotomy. Next, the head is opened by cutting with a line saw between the holes, and the bone flap is removed. Next, the inner dura is incised from the craniotomy, and various operations are performed on brain tissue and the like. After the operation on the brain tissue or the like is completed, a craniotomy operation for closing the craniotomy by returning the bone flap to the craniotomy is performed.

[0003] However, vascular disorders (such as arterial cancer) and
For skull base tumors and the like, it is necessary to perform a craniotomy operation from the supraorbital line of the skull to the zygomatic and sphenoid parts. And
The part between the upper margin of the orbit and the zygomatic bone and the sphenoid bone has a complicated bone shape,
In addition, since many nerves and blood vessels pass through these parts, a cleaved head must be formed with only a plurality of circular holes without using a wire saw, and the bone flap retains its shape. Often, it often shatters. Therefore, at the time of craniotomy, repair has conventionally been performed using resin or autogenous bone fragments that have been scraped off at the time of craniotomy.

[0004]

However, when a resin is used, there is a problem such as infection because the resin is a completely foreign substance to a living body. In addition, autogenous bone fragments could not be repaired sufficiently, and appearance problems occurred after surgery. Furthermore, the existing bone substitute does not compensate for the inside shape of the skull, and cannot reconstruct the shape between the upper orbit of the inside of the skull and the zygomatic and sphenoid bones. There was a problem that the burden on the patient increased. The present invention has been devised in view of the above circumstances, and an object of the present invention is to perform a craniotomy operation of a craniotomy formed over an upper orbital edge of a skull and a portion between a cheekbone and a sphenoid bone. To provide a bone replacement material that can easily reconstruct the shape between the upper margin of the orbit inside the skull and the zygomatic bone and the sphenoid bone without causing problems such as infection and postoperative appearance problems. is there.

[0005]

In order to achieve the above object, the present invention provides a bone replacement material used for repairing a craniotomy formed between the upper orbit of the skull, the zygomatic bone and the sphenoid bone,
An inner portion inserted from the craniotomy and forming an inner side of the skull, and an outer portion positioned at the craniotomy and forming an outer side of the skull, wherein the outer portion has a first side extending a predetermined length. The outer portion is formed of a thin outer thin piece, and the inner portion is formed of an inner thin portion and a rib portion. The inner thin portion is a portion of a first outer surface that forms one of both surfaces of the outer thin portion. The rib is formed so as to extend in a direction substantially orthogonal to the outer thin piece from a portion extending over the entire length of the first side, and the rib portion is located on the first outer surface side of both surfaces of the inner thin piece. On the first inner surface and the first outer surface forming one surface, the first and second sides extend in a direction substantially perpendicular to the extending direction of the first side from a central portion in the extending direction of the first side. The first outer surface and the first inner surface are formed to extend over the entire length in the extending direction. The height of the rib portion on the first inner surface is formed so as to gradually decrease as the distance from the outer thin piece increases, and the inner portion and the outer portion are formed of a calcium phosphate-based compound. The outer surface of the skull portion between the upper orbital edge and the zygomatic bone and the sphenoid bone is formed by the second outer surface forming the other surface of the skull bone. The portion between the sphenoid bones is formed.

In the present invention, the outer thin piece and the inner thin piece are each formed in a substantially triangular shape with the first side as a base, and the rib portion is formed from a vertex of a triangle of the outer thin piece. It is characterized in that the inner thin piece is formed so as to bulge over the vertex of the triangle.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1A is a plan view of a bone replacement material,
(B) is a view of arrow B of (A), (C) is a view of arrow C of (B), FIG. 2 is a perspective view of a state in which a bone replacement material is inserted into the craniotomy, and FIG. FIG. 4 is a side view, FIG. 4 is a perspective view of the inner surface of the skull bottom with the bone replacement material inserted into the craniotomy, FIG. 5 is a plan view of the same, and FIGS. 2 to 5 show how to use the bone replacement material. For this purpose, a state is shown in which bone replacement materials have been inserted into the left and right side craniotomy of the skull. The bone replacement material 2 is used for repair between the upper orbit 402 of the skull 4 and the zygomatic bone 404 and the sphenoid bone 406, and is formed of a calcium phosphate compound. Examples of the calcium phosphate compound include, for example, monobasic calcium phosphate, tribasic calcium phosphate, hydroxyapatite and the like. In Examples, those having a porous structure are used. The bone filling material 2 includes an open head 41 formed in the skull 4.
0 and an inner part 6 forming the inside of the skull 4 and an outer part 8 located at the craniotomy 410 and forming an outer side of the skull 4, the outer part 8 being formed by an outer thin piece 10, Is composed of an inner thin piece 12 and a rib portion 14.

The outer thin piece 10 is thin and formed in a substantially triangular shape, and the bottom side 1002 (corresponding to the first side in the claims) of the outer thin piece 10 is formed with an inward concave curve, and the apex angle. Two sides 1006, 1006 sandwiching 1004 are formed linearly. The inner surface 101 of the outer thin piece 10
0 (corresponding to the first outer surface of the claims) to the inner portion 6
Is formed, after the operation, the apex angle 1004 part is turned up, the inner part 6 is inserted into the craniotomy 410 facing the inside of the skull 4, and the outer surface 1012 of the outer thin piece 10 (the second part of the claims) Of the outer skull 4 is formed on the outer surface 1012 of the outer thin piece 10.

The inner thin piece 12 is moved from the bottom 1002 to the bottom 100 by the inner surface 1010 of the outer thin piece 10.
It is formed to extend in a triangular shape in a direction substantially orthogonal to the outer thin piece 10 with 2 as the base. After the operation, since the inside portion 6 is inserted into the craniotomy 410 with the apex angle 1004 part facing up and inside the skull 4, the surface of the inner thin piece 12 where the apex angle 1004 portion is located is the upper surface 1202. (Corresponding to the first inner surface in the claims), and the opposite surface is the lower surface 1.
204. The rib portion 14 is formed to protrude from the apex angle 1004 of the outer thin piece 10 to the apex angle 1204 of the inner thin piece 12 on the inner surface 1010 of the outer thin piece 10 and on the upper surface 1202 of the inner thin piece 12. I have. The height of the rib portion 14 on the upper surface 1202 is formed so as to gradually decrease as the distance from the outer thin piece 10 increases. The inner thin piece 12 and the rib portion 14
It is formed in a shape similar to the shape between the upper orbital edge 402 inside the skull 4, the cheekbone 404, and the sphenoid bone 406.

Next, a craniotomy operation using the bone filling material 2 will be described. The upper orbit 402 of the skull 4 by craniotomy
And the contour of the bone prosthesis 2 is cut and adjusted to match the contour of the craniotomy 410 formed between the zygomatic bone 404 and the sphenoid bone 406. The outer thin piece 10 and the ribs 14 are cut and adjusted to match the shape 420 between the sphenoid bones 406. Next, the inner portion 6 is inserted into the craniotomy 410 with the outer surface 1012 of the outer thin piece 10 facing outward and the apex angle 1004 of the outer thin piece 10 facing upward, facing the inside of the skull 4. Next, the bone replacement material 2 is fixed in the craniotomy 410 using a nylon thread or the like. Next, the outer surface 1 of the outer thin piece 10
The scalp is put on 012 and the scalp is sewn to complete the operation.

According to this embodiment, since the bone replacement material 2 is formed of a calcium phosphate compound, permanent bone fusion can be expected without causing problems such as infection. Furthermore,
In the embodiment, since a calcium phosphate compound having a porous structure is used, it is possible to promote reliable bone fusion in a shorter time. In addition, the bone replacement material 2 includes an outer portion 8 having surfaces 1012 and 1010 forming the inside and outside of the skull 4, and a shape 420 between the upper orbital edge 402 inside the skull 4, the zygomatic bone 404, and the sphenoid bone 406. Since the inner part 6 is formed in advance, there is no postoperative appearance problem, and the upper orbital edge 402, the cheekbone 404 and the sphenoid bone 40 inside the skull 4 are not formed.
The reconstruction of the shape 420 between 6 can be easily performed.

Next, another embodiment having a slightly different shape from the above embodiment will be described with reference to FIGS. 6 and 7. FIG. 6 and 7, (A) is a plan view of the bone replacement material, (B) is a view of arrow B of (A), (C) is a view of arrow C of (B), and (D) is ( FIG. 4B is a cross-sectional view as viewed in the direction of arrow D in FIG. Since the shapes are only slightly different from each other, the same reference numerals are used in the description. In the embodiment shown in FIG. 6, the outer thin piece 10 and the inner thin piece 12 are formed into a substantially rectangular shape elongated in the extending direction of the base 1002. Unlike the embodiment shown in FIG. 1 in that it is formed, in the embodiment shown in FIG. 7, the outer thin piece 10 and the inner thin piece 12 are formed in a substantially elliptical shape elongated in the extending direction of the base 1002. This is different from the embodiment shown in FIG. 6 and 7
The bone substitute 2 shown in FIG. 1 is shaved during the operation as shown by an imaginary line 200, and the outer thin piece 10 and the inner thin piece 12 are each formed into a substantially triangular shape similarly to the bone replacer 2 shown in FIG. Can be

[0013]

As is clear from the above description, the present invention
A bone filling material used for repair between the upper orbit of the skull and the zygomatic bone and the sphenoid bone, wherein the bone filling material is inserted into an open head formed in the skull and forms an inner part of the skull and an outer part forming an outer part of the skull. Wherein the outer portion is formed of a thin, generally triangular outer thin piece, one surface of the outer thin piece forms an outer surface of a skull, and the inner portion is the other surface of the outer thin piece. An inner orifice on the inner side of the skull and an inner thin piece formed in a shape similar to the shape between the zygomatic bone and the sphenoid bone, and a rib portion swelled on the inner thin piece, The part and the outer part are formed of a calcium phosphate compound. Therefore, during craniotomy of the craniotomy formed over the upper orbit of the skull and the portion between the cheekbone and the sphenoid bone, no problems such as infection or postoperative appearance problems occur, and the skull It is possible to easily carry out reconstruction of the shape between the upper orbit of the inside of the eye and the zygomatic bone and the sphenoid bone.

[Brief description of the drawings]

1 (A) is a plan view of a bone replacement material, FIG. 1 (B) is a view from arrow B in FIG. 1 (A), and FIG. 1 (C) is a view from arrow C in FIG.

FIG. 2 is a perspective view of a state in which a bone replacement material has been inserted into the craniotomy of the skull.

FIG. 3 is a side view showing a state where a bone replacement material has been inserted into the craniotomy of the skull.

FIG. 4 is a perspective view of the inner surface of the skull base in a state where the bone replacement material has been inserted into the craniotomy.

FIG. 5 is a plan view of the inner surface of the skull base in a state where the bone replacement material has been inserted into the craniotomy.

FIG. 6A is a plan view of a bone substitute according to another embodiment,
(B) is a view on arrow B of (A), (C) is a view on arrow C of (B), and (D) is a sectional view on arrow D of (B).

FIG. 7A is a plan view of a bone substitute according to another embodiment,
(B) is a view on arrow B of (A), (C) is a view on arrow C of (B), and (D) is a sectional view on arrow D of (B).

[Explanation of symbols]

 Reference Signs List 2 bone replacement material 4 skull 6 inner part 8 outer part 10 outer thin piece 12 inner thin piece 14 rib

Claims (2)

[Claims] 1. A bone replacement material used for repairing a craniotomy formed between an upper orbit of a skull and a zygomatic bone and between a zygomatic bone and a sphenoid bone, wherein an inner portion is inserted from the craniotomy and forms an inner side of the skull; An outer portion located on the craniotomy and forming an outer side of the skull; the outer portion is formed of a thin outer thin piece having a first side extending a predetermined length; and the inner portion is an inner thin wall. The inner thin piece is a portion of a first outer surface that forms one of both surfaces of the outer thin piece and extends from a portion extending over the entire length of the first side to an outer thin piece. The rib portion is formed so as to extend in a direction substantially perpendicular to the first thin surface, and the rib portion is formed on a first inner surface, which is one surface located on the first outer surface side of both surfaces of the inner thin piece, and On the outer surface, the center of the first side extends from the center in the direction in which the first side extends. The first outer surface and the first inner surface are formed so as to extend in the direction substantially perpendicular to the existing direction over the entire length of the extending direction of the first outer surface and the first inner surface, and the height of the rib portion on the first inner surface is outer thin The inner portion and the outer portion are formed of a calcium phosphate-based compound, and the upper and lower orbits are formed by a second outer surface forming the other surface of both surfaces of the outer thin piece. An outer surface of a skull portion is formed between the zygomatic bone and the sphenoid bone, and the inner thin piece and the rib portion form an inner orbital upper edge of the skull and a portion between the zygomatic bone and the sphenoid bone, Bone replacement material. 2. The outer thin piece and the inner thin piece are each formed in a substantially triangular shape with the first side as a base.
The bone replacement material according to claim 1, wherein the rib portion is formed so as to bulge from a vertex of a triangle of the outer thin piece to a vertex of a triangle of the inner thin piece.