PROBLEM TO BE SOLVED: To improve the deficit of a metal-to-metal type artificial coxa excellent in wear resistance that it lacks any shock relaxation ability by introducing a pain relieving material between the metal materials.SOLUTION: The artificial coxa includes an outer metallic cup fitted into the acetabulum and having its external surface cut off diagonally downward at about 45° and a cylindrical concavity formed within this externally cut surface and an inner cylindrical metallic sleeve rotatably and movably fitted into the outer cup cylindrical concavity, having its lower external surface cut off diagonally downward at about 45°, and having its metallic cylindrical inner sleeve contain a nearly hemispherical concavity, into which a thighbone head is fitted across the external cut surface in the way that the thighbone head can make precessional movements. A shock relaxation material is inserted into a clearance secured between the outer cup and the inner sleeve.COPYRIGHT: (C)2011,JPO&INPIT【課題】 耐磨耗性に優れる金属対金属型の人工股関節における衝撃緩和性に欠けるという欠点を両者の間に衝撃緩和材を介装させることで解決する。【解決手段】 寛骨臼に嵌入され、外面がほぼ45°で斜め下方にカットされ、カット面から上方に円筒状凹部が形成された金属製アウターカップと、アウターカップの円筒状凹部に旋回・摺動可能に嵌合され、下外面がほぼ45°で斜め下方にカットされ、カット面に臨んで大腿骨ヘッドが才差運動可能に嵌入される略半球状凹部が形成された円筒体の金属製インナースリーブとからなる人工股関節であり、アウターカップとインナースリーブとの間に隙間を確保してこの隙間に衝撃緩和材を介装する。【選択図】 図2
