JPH063551Y2 - Bone plate - Google Patents

Description

[Detailed Description of the Invention] [Technical field] The present invention relates to a bone joint used for joining a bone fractured due to a fracture, a bone tumor, or the like, or an artificial bone used for a bone defect portion and a living bone. Regarding the plate.

"Prior Art and Its Problems" When a fracture or a bone defect is caused by a bone fracture, bone tumor, etc., a method of fixing a metal plate along the site with a screw has been generally performed conventionally. However, the conventional metal plate simply fixes the bones to each other and cannot hold the artificial bones when the artificial bones are filled in the bone defect portion. Therefore, fixation of the artificial bone is likely to be incomplete, and in order to prevent this, another member such as a stainless wire having low biocompatibility has been used together. However, this conventional method is often the cause of engraftment of artificial bone or formation failure of bone tissue, eventually exposure of artificial bone, loss of infection, and the like.

"Purpose of the Invention" The present invention is a bone-bonding plate that can firmly bond a living bone and an artificial bone, does not loosen even when stored in the living body for a long time, and has excellent biocompatibility. Aim to get. Another object of the present invention is to obtain an osteosynthesis plate having good workability during the joining work.

[Outline of the Invention] The osteosynthesis plate according to the present invention projects laterally from the strength substrate to be fixed along the fractured bone.
At least three gripping and fixing projections to be wrapped around the bone are integrally provided, and among these three gripping and fixing projections,
It is characterized in that a fixing screw hole is formed in the strength substrate so as to correspond to the gripping and fixing projections on both ends, and the thickness of the gripping and fixing projection is formed thinner than the thickness of the strength substrate.

The three gripping and fixing projections are wound around the living bone at the two ends thereof and at the middle one around the artificial bone. Then, by fixing the strength substrate to the artificial bones on both sides through the fixing screw holes on both ends, a strong joint structure can be obtained.

Since the gripping and fixing projection is wound around a living bone or an artificial bone, it is desirable that the winding (bending) can be performed with a light force, and the strength substrate has a strength that does not easily bend.
Therefore, the grip fixing projection is formed thinner than the strength substrate.

The gripping / fixing projection is difficult to bend, especially at the connecting portion with the strength substrate. For this reason, it is desirable that the gripping and fixing projections be formed so that the width of the connecting portion with the strength substrate is narrower than the width of the other portions. Alternatively, the thickness of the connecting portion with the strength substrate is formed thinner than the thickness of other portions.

Further, in order to enhance the bendability of the entire grip fixing projection, a plurality of grooves parallel to the longitudinal direction of the strength substrate can be formed in the grip fixing projection.

It is most preferable that the strength substrate and the grip fixing projection are provided in a flat plate shape located in the same plane for convenience of manufacturing, transportation, and storage. However, it is also possible to give an appropriate curvature in advance according to the expected shape of the bone. If the curvature is given, the deformation along the bone can be more easily given.

The osteosynthesis plate according to the present invention can be made of various metal materials. As the metal material, for example, titanium-based metal, stainless steel, tantalum-based metal and the like are preferable. Considering that the titanium-based metal is embedded in the living body for a long period of time, a titanium-based metal having high corrosion resistance and biocompatibility higher than that of conventional stainless steel is the most preferable material.

Further, by coating the surface of the osteosynthesis plate of the present invention with a ceramic material such as calcium phosphate ceramics (such as apatite), alumina, zirconia, and titania, the corrosion resistance can be further improved. In particular, when calcium phosphate ceramics is coated, corrosion resistance and excellent biocompatibility can be obtained, and the plate and the bone can be directly bonded and fixed very firmly.
The methods for coating these ceramic materials on the bone-bonding plate include the thermal spraying method, the sputtering method, the ion cluster beam method, and the like. However, for coating to a thickness sufficient to have biocompatibility, plasma spraying is necessary. Method, or flame spraying method is preferably used.

The bone-bonding plate of the present invention was directly developed for bonding biological bones sandwiching an artificial bone, but can also be used for bonding biological bones.

"Embodiment of the Invention" The present invention will be described below with reference to illustrated embodiments. 1 and 2 are a plan view and a front view of an osteosynthesis plate 1 according to the present invention.

The bone-bonding plate 1 includes a plate-shaped band-shaped strength substrate 2
The holding and fixing projections 3, 4 and 5 are formed to project in the same direction at both end portions and the intermediate portion thereof so as to be orthogonal to the longitudinal direction thereof. These gripping and fixing projections 3, 4, 5 are
All of them are formed in the same plane as the strength substrate 2, and the thickness t of the gripping and fixing projections 3, 4, 5 is smaller than the thickness T of the strength substrate 2. When the role of T is about 1/4 to 3/4, and more preferably about 1/3 to 2/3, the strength of the strength substrate 2 and the bendability of the gripping and fixing projections 3, 4, 5 are set. It was confirmed that the balance was good.

The connecting portion s of the gripping / fixing projections 3, 4, 5 with the strength substrate 2 can be a thin portion 7 as shown in FIG. 3 in order to facilitate bending. In order to improve the bendability of the connecting portion s, notches 6 are formed on both sides of the connecting portion s as shown by the chain line in FIG. 1, and the connecting portion s is made narrower. You may form.

Further, if a plurality of grooves 7a parallel to the longitudinal direction of the strength substrate 2 are formed in the gripping / fixing projections 3, 4, 5 as shown in FIG.

The strength substrate 2 has fixing screw holes 8 and 9 formed at both ends thereof. One of the fixing screw holes 8 and 9 is an eccentric screw hole (taper screw hole) 8 whose width becomes narrower toward the end portion of the strength substrate 2, and the fixing screw is fitted to the narrow portion side (end portion side). When it is screwed in, the strength substrate 2 is pulled by the action of this taper, and the compression bonding between the living bone and the artificial bone becomes possible. Numeral 10 is a fenestration portion provided in the middle of the strength substrate 2, and when used for joining the artificial bone and the living bone, hits a portion of the artificial bone and enables treatment of the artificial bone. Further, the fenestration portion 10 contributes to weight reduction of the main bone bonding plate 1.

The bone-bonding plate 1 is entirely made of a metal material selected from titanium-based metals, stainless steel, and tantalum-based metals. Particularly, titanium-based metal is preferable. And on its surface, calcium phosphate ceramics, alumina,
A ceramic material such as zirconia or titania can be coated. The coating can be performed by a plasma spraying method or a flame spraying method so that the thickness of the ceramic material required to obtain high biocompatibility can be obtained.

4A to 4C show examples of use of the osteosynthesis plate 1 of the present invention. FIG. 4A shows a joint example in which an artificial bone C is interposed between living bones A and B, FIG. 4B shows a joint example in the case of crushed fracture, and FIG. 4C shows a joint example in the case of simple fracture. . In the case of FIG. 4B, a bone fragment D is interposed between the living bones A and B. In any case, the strength substrate 2 is placed along these bones and fixed by the fixing screws 12 inserted into the fixing screw holes 8 and 9, and the gripping and fixing projections 3, 4 and 5 are made of bone (living bone or Wrap around artificial bone). The above-mentioned means for reducing the thickness of the gripping and fixing projections 3, 4, 5 is useful for facilitating the winding and bending workability. The eccentric screw hole 8 applies a force to the living bones A and B in a direction in which they approach each other, and as a result, a compression joint or a strong joint due to the formation of a secondary bone is obtained.

Elements such as the number of the gripping and fixing projections 3, 4, 5 and the protruding direction from the strength substrate 2, and the length of the strength substrate 2 are appropriately determined according to the intended use site. As described above, the gripping and fixing protrusions 3, 4, and 5 may have a curvature smaller than the final curvature.

[Advantages of the device] The bone-bonding plate according to the present invention is fixed by fixing screws inserted into the fixing screw holes along the living bones to be joined with the strength substrate or the living bones including artificial bones. At the same time, since the gripping and fixing projection is wrapped around the bone and bent, it is possible to provide an osteosynthesis plate that has excellent integrity with the bone, strengthens the fixation of the plate, and can withstand long-term use.

Further, by coating the surface with a ceramic material, the corrosion resistance is significantly improved. In particular, by coating calcium phosphate ceramics, corrosion resistance and excellent biocompatibility can be obtained, and an extremely strong fixing structure can be obtained in which the plate is directly bonded to living bone.

[Brief description of drawings]

1 and 2 are a plan view and a front view showing an embodiment of an osteosynthesis plate of the present invention, and FIG. 3 shows another embodiment of the present invention, which is a plan view corresponding to FIG. 4A, 4B
FIG. 4C is a perspective view showing a usage example of the bone-bonding plate. DESCRIPTION OF SYMBOLS 1 ... Bone-bonding plate, 2 ... Strength board, 3, 4, 5 ... Bone-holding / fixing projection, 6 ... Notch, 7 ... Groove, 8, 9, ... Fixing screw hole, 12 ... Fixing screw.

Claims (8)

[Scope of utility model registration request] 1. A strength base plate to be fixed along a fractured bone; at least three gripping and fixing projections laterally projecting from the strength base plate to be wound around the bone; and three gripping parts. Among the fixing protrusions, the fixing screw holes formed on the strength substrate are provided in correspondence with the grip fixing protrusions at both ends; and the thickness of the grip fixing protrusion is made thinner than the thickness of the strength substrate. Characteristic osteosynthesis plate. 2. The bone-bonding plate according to claim 1, wherein the gripping and fixing projection is formed so that the width at the connecting portion with the strength substrate is narrower than the width at other portions. 3. The bone-bonding plate according to claim 1, wherein the gripping and fixing projection is formed so that the thickness at the connecting portion with the strength substrate is thinner than the thickness at other portions. 4. The grip fixing projection according to claim 1,
An osteosynthesis plate in which a plurality of grooves parallel to the longitudinal direction of the strength substrate are formed. 5. An osteosynthesis plate according to claim 1, wherein the strength substrate and the grip fixing projection are selected from titanium-based metals, stainless steel, and tantalum-based metals. 6. The bone-bonding plate according to claim 1, wherein the strength substrate and the surface of the grip fixing projection are coated with ceramics. 7. The bone-bonding plate according to claim 6, wherein the ceramic is calcium phosphate ceramics. 8. The osteosynthesis plate according to claim 6 or 7, wherein the calcium phosphate ceramics is coated by plasma spraying or flame spraying.