Patent ID: 8252062
Filing Date: 2012-08-28
Classification: A61F

Abstract:
1. An artificial cement-less hip prosthesis stem which is adapted to be implanted into a deep hollow extending from an epiphysis to a diaphysis of a femur so as not to pass through a greater trochanter thereof, and being adapted to gradually be united with the femur by bone growth, comprising; an inner construct having both a neck to be engaged with a spherical head which works as a joint in cooperation with a socket adapted to be fixed to a pelvis and an inner body to be reacted with a load transmitted from the neck, an outer construct made of fiber reinforced plastics having both an outer body which is bell mouth-shaped and adapted to open toward the epiphysis so as to surround said inner body which is combined with the outer body by an adhesive filler filled in a space between the outer body and the inner body and a leg adapted to extend toward a medullary cavity, for transmitting a load acting on a hip joint to the femur, wherein said inner body does not directly contact an inner surface of the outer construct, and torsional rigidity given to a proximal end and a distal end of said outer body and the leg is regulated to be lower than a torsional rigidity of an intermediate portion of said outer body, resulting in transmitting the load distributed collectively on an intermediate portion to a proximal portion of the femur as uniformly as possible.