JPH04126516U - Bone replacement material for anterior spinal fixation - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a bone replacement material for anterior spinal fixation that does not come into contact with or compress nerves located around the spinal cord. [Structure] A diseased intervertebral disc (not shown) and a portion of the upper and lower vertebral bodies (not shown) adjacent to the diseased disc are excised, and an arrow mark is placed on the resected part from the front (front side) of the patient (not shown). The end of the bone grafting material 10 fitted in the direction indicated by A on the side closest to the spinal cord (not shown) and facing the spinal cord has a concave curve corresponding to the circumferential shape of the spinal cord. A surface 13 is formed so that the curved surface 13 is sufficiently spaced from the vertebrae when the bone grafting material 10 is inserted into the upper and lower vertebrae.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

TECHNICAL FIELD The present invention relates to a bone replacement material used for anterior fusion of the cervical vertebrae, lumbar vertebrae, etc.

0002

[Conventional technology]

Generally, anterior fixation is used as a surgical treatment for spinal diseases such as intervertebral disc herniation. There is a method called jutsu. This involves cutting the diseased disc from the front (front side) of the patient. In this method, bone grafting is performed between the upper and lower vertebral bodies adjacent to the diseased intervertebral disc. Traditionally, autologous bone harvested from the patient's ilium was used for the bone grafts mentioned above. However, the patient's healthy parts may be surgically invasive, and the processing of the harvested bone may take a long time. However, in recent years, for example, alumina Bone replacement materials made of so-called bioceramics such as hydroxyapatite and hydroxyapatite are used. It is now possible to do so. As shown in FIG. Parts 3 and 4 are removed and inserted into that part from the front of the patient, and the bone As shown in FIG. 5, the prosthetic material 1 has at least a flat end 1a on the spinal cord 5 side, that is, the insertion side. It is formed in many ways.

0003

[Problem that the idea aims to solve]

However, in the conventional bone grafting material 1, the end 1 on the spinal cord 5 side, that is, the insertion side a is formed flat, so that the bone grafting material 1 can be attached to the nerves located around the spinal cord 5 (Fig. There is a problem that the patient may come into contact with the nerves (not shown) or press on the nerves. There was a risk of causing unnecessary pain to the patient. The present invention was developed in view of these points, and it is a method that connects the nerves located around the spinal cord. We aim to provide a bone replacement material for anterior spinal fixation that does not touch or put pressure on nerves. purpose.

0004

[Means to solve the problem] In order to achieve the above object, the present invention aims to provide a vertebrae in which the spinal cord is inserted and which extends in the direction in which the spinal cord extends. At least two adjacent vertebral bodies among the plurality of vertebral bodies arranged with intervening discs interposed therebetween; A part of the vertebral body and the intervertebral disc located between these vertebral bodies are removed, and the disc is inserted into the removed part. A bone grafting material for anterior spinal fixation comprising: a side of the bone grafting material facing the spinal cord; A concave surface corresponding to the spinal cord was formed at the end.

[0005]

【Example】

Hereinafter, embodiments of the present invention will be described based on the drawings. Figure 1 shows a bone prosthesis material for anterior spinal fixation according to an embodiment of the present invention. a) is a plan view, and FIG. 1(b) is a front view. In addition, FIGS. 2 and 3 are similar to FIG. 1(a), It is an explanatory view showing a state where the bone grafting material shown in (b) is inserted into a vertebral body. As shown in FIG. The excised portion 20a and the front of the upper and lower vertebral bodies 30, 30 adjacent to the diseased intervertebral disc 20 The front part of the patient (not shown) is inserted into the recessed part 31 formed by the removed part 30a. This bone grafting material 10 is inserted from the front side (front side) as shown in Fig. 1(a). There are anti-slip grooves 11a, 11a on the top surface 11 as indicated by arrow A in Fig. 1(a). A plurality of them are formed in a direction intersecting with the insertion direction of the bone grafting material 10 shown in FIG. 1(b). As shown, similar grooves 12a, 12a are also formed on the lower surface 12 of the bone grafting material 10. There is.

[0006] Furthermore, when the bone grafting material 10 is inserted into the state shown in FIG. The end of the bone grafting material 10 on the side facing the spinal cord 40 has a circumferential shape of the spinal cord 40. A concave curved surface 13 as shown in FIG. 1(a) is formed to correspond to the bone When the filling material 10 is inserted into the recess 31, the curved surface 13 is shaped as shown in FIG. It is arranged to be sufficiently spaced from the spinal cord 40. Further, the upper and lower vertebral bodies 30 and 30 are provided on both sides 14 and 15 of the bone grafting material 10. To avoid damaging blood vessels and nerves (not shown) in the vicinity of the The tapered parts 16, 16 are formed to extend in the insertion direction A of the bone prosthetic material 10. .

[0007] The bone grafting material 10 of this embodiment is made of bone grafts such as alumina and zirconia. Bioinert bioceramics, hydroxyapatite, and fluorine that are not compatible Apatite, tricalcium phosphate, tetracalcium phosphate, calcium phosphate gala Molded from bioactive bioceramics with osteointegration properties such as glass or crystallized glass. However, the latter bioactive bioceramic is more important than the bioinert bioceramic. More preferably.

[0008] Next, an example of a method for manufacturing the bone grafting material 10 will be explained. Synthesized by a known wet method using calcium hydroxide slurry and phosphoric acid aqueous solution After powdering the hydroxyapatite slurry by spray drying, Producing a porous molded body by the method using methylcellulose disclosed in No. 868, The shape shown in FIGS. 1(a) and 1(b) was formed by machining using an arbitrary method. So This was then baked at 1200° C. for 4 hours to obtain the bone grafting material 10.

[0009] In this embodiment, the bone grafting material 10 is provided with anti-slip grooves 11a and 12a and a tapered portion. 16, but there are configurations in which one or both of these are omitted. You can also use it as In addition, the method for producing the bone filling agent 10 is not limited to the method described above, and furthermore, the method for producing the bone filling agent 10 is The material of Agent 10 is the above-mentioned bioinert bioceramics and bioactive bioceramics. It is not limited to mixes, for example, metals, polymer compounds, or general ceramics. It may also be a lamix coated with a thermal spraying method or the like.

0010

[Effect of the idea]

As explained above, according to the bone grafting material for anterior spinal fixation of the present invention, it is possible to A recess corresponding to the spinal cord is formed on the end of the spinal cord that is close to the vertebrae and faces the spinal cord when inserted. Since a surface is formed, the end of the bone grafting material on the insertion side should be sufficiently spaced from the vertebrae. may come into contact with or compress the nerves located around the spinal cord, causing unnecessary damage to the patient. This can prevent severe pain.

[Brief explanation of drawings]

FIG. 1 shows a bone grafting material for anterior spinal fixation according to an embodiment of the present invention, with FIG. 1(a) being a plan view and FIG. 1(b) being a front view.

FIG. 2 is an explanatory view of the state in which the bone grafting material shown in FIGS. 1(a) and 1(b) is inserted into the vertebral bodies, as seen from the direction in which the vertebral bodies are arranged.

FIG. 3 is an explanatory view of the bone grafting material shown in FIGS. 1(a) and 1(b) inserted into a vertebral body, as seen from the front side of a patient.

FIG. 4 is an explanatory diagram of a state in which a conventional bone prosthesis material for anterior spinal fixation is inserted into a vertebral body, as seen from the direction in which the vertebral bodies are arranged.

FIG. 5 is an explanatory view of a state in which a conventional bone grafting material for anterior spinal fixation is inserted into a vertebral body, as seen from the front side of a patient.

[Explanation of symbols]

10 Bone replacement material 13 Curved surface (concave surface) 20 Intervertebral disc 30 vertebral body 31 Recess (removed part) 40 Spinal cord

Claims (1)

[Scope of utility model registration request] 1. Of a plurality of vertebral bodies through which the spinal cord is inserted and which are arranged via intervertebral discs in the direction in which the spinal cord extends, at least two adjacent vertebral bodies and the intervertebral discs located between these vertebral bodies are provided. A bone grafting material for anterior spinal fixation that is cut out and inserted into the excised portion, wherein a concave surface corresponding to the spinal cord is formed at the end of the bone grafting material on the side facing the spinal cord. Features: Bone replacement material for anterior spinal fixation.