PROBLEM TO BE SOLVED: To provide an osteosynthesis instrument which can securely bond a broken bone while suppressing damage to the bone.SOLUTION: An osteosynthesis instrument 1 of the invention, which is used to bond the bone pieces of a broken bone 19 together, includes: a tapered member 4, on the outer peripheral surface of which five inclined planes 9 are formed a rod 6 screwed into the tapered member 4 and an expanding member 8 consisting of five touching parts 12 and a bridging part 13 for connecting the touching parts 12. When the osteosynthesis instrument 1 is inserted into an installation hole 2 formed in the broken bone 19, the touching parts 12 and connection parts 13b of the bridging part 13 of the expanding member 8 are pushed against an inner peripheral surface 7 of the installation hole 2. In this state, the tapered member 4 moves to the opening side of the installation hole 2, and therefore the touching parts 12 are pushed to the side of the inner peripheral surface 7 of the installation hole 2 by the inclined planes 9 of the tapered member 4, and then the outer peripheral surfaces 15 of the touching parts 12 are pushed against the inner peripheral surface 7 of the installation hole 2 in a surface contact state to fix the touching parts 12 to the inner peripheral surface 7 of the installation hole 2.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】 骨の破損を抑えながら折れた骨を確実に接合できる骨接合用器具を提供する。【解決手段】 本発明の骨接合用器具1は、折れた骨19の骨片どうしを接合するために使用され、外周面に五面の傾斜面9を形成するテーパー部材4と、テーパー部材4に螺合するロッド6と、五つの当接部12およびそれらの当接部12を接続する架橋部13からなる拡開部材8を有する。骨接合用器具1を折れた骨19に形成した取付孔2に差し込んだ際には、拡開部材8の当接部12や架橋部13の接続部位13bが取付孔2の内周面7に押し付けられ、その状態でテーパー部材4が取付孔2の開口側に移動することで、テーパー部材4の傾斜面9によって当接部12が取付孔2の内周面7側に押されて、当接部12の外周面15が取付孔2の内周面7に面当たり状に押し付けられ、当接部12が取付孔2の内周面7に固定される。【選択図】 図1
