Prosthesis for hip joints

Claim 2

A prosthesis for hip joints comprising an elongated spikelike stem adapted to be inserted axially into the upper portion of the femur, an arm attached at the upper end of the stem and projecting outwardly therefrom at an obtuse angle relative to the stem, a ball-shaped member attached at the outer end of the arm for connecting the prosthesis to a socket, and means on the stem indexed relative to a designated portion of the femur, the arm and ball being disposed at an angle relative to said means so that when the stem is fully inserted in the femur and said means coincides with said designated portion of the femur, the arm and ball are aligned at a predetermined angle relative to the transverse axes of the femur, said means including a cup-shaped member projecting outwardly from the side of the stem near the intersection of the stem and the arm, the cup-shaped member being shaped and dimensioned to fit over the upper portion of the lesser trochanter portion of the femur.

Claim 3

A prosthesis for hip joints according to claim 1, wherein the stem is generally cone-shaped and has a plurality of flutes spaced apart around the outer surface and extending along a substantial portion of the length thereof, the stem further includes a collar portion projecting outwardly therefrom opposite the arm, thereby forming an opening between the collar and the stem, and the collar has a plurality of holes therein.

Claim 4

A prosthesis for hip joints comprising an elongated spike-like stem adapted to be inserted axially into the upper portion of the femur, an arm attached at the upper end of the stem and projecting outwardly therefrom at an obtuse angle relative to the stem, a ball-shaped member attached at the outer end of the arm for connecting the prosthesis to a socket, a cup-shaped member projecting outwardly from the side of the stem near the intersection of the stem and the arm, the cup-shaped member being shaped and dimensioned to fit over the upper portion of the lesser trochanter portion of the femur, the arm and ball being disposed at an angle relative to sAid cup-shaped member so that when the stem is fully inserted in the femur, the arm and ball are aligned at a predetermined angle relative to the transverse axes of the femur, said stem being generally cone-shaped and having a plurality of flutes spaced apart around the outer surface and extending along a substantial portion of the length thereof, the stem further including a collar portion projecting outwardly therefrom opposite the arm, thereby forming an opening between the collar and the stem, the collar including a plurality of holes therein, and an artificial socket receiving the ball, the artificial socket including an inner socket portion and a separate outer ring portion that engages the socket along the outer edge thereof, both of said portions having an inner surface shaped and dimensioned to accommodate the ball and extending a short distance beyond the diametrical center of the ball so that when the artificial socket engages the ball, said ball is movably captured therein, a pair of threaded screws pass through holes located in the ring and project outwardly from the artificial socket away from the arm of the prosthesis, and gripper jaws are threaded onto the outer ends of the screws, the jaws being shaped to fit over portions of the hip bone for securing the artificial socket to the hip bone.

Claim 5

A prosthesis for hip joints comprising an elongated spike-like stem adapted to be inserted axially into the upper portion of the femur, an arm attached at the upper end of the stem and projecting outwardly therefrom at an obtuse angle relative to the stem, a ball-shaped member attached at the outer end of the arm for connecting the prosthesis to a socket, a cup-shaped member projecting outwardly from the side of the stem near the intersection of the stem and the arm, the cup-shaped member being shaped and dimensioned to fit over the upper portion of the lesser trochanter portion of the femur, the arm and ball being disposed at an angle relative to sAid cup-shaped member so that when the stem is fully inserted in the femur, the arm and ball are aligned at a predetermined angle relative to the transverse axes of the femur, said stem being generally cone-shaped and having a plurality of flutes spaced apart around the outer surface and extending along a substantial portion of the length thereof, the stem further including a collar portion projecting outwardly therefrom opposite the arm, thereby forming an opening between the collar and the stem, the collar including a plurality of holes therein, and an artificial socket receiving the ball, the artificial socket including an inner socket portion and a separate outer ring portion that engages the socket along the outer edge thereof, both of said portions having an inner surface shaped and dimensioned to accommodate the ball and extending a short distance beyond the diametrical center of the ball so that when the artificial socket engages the ball, said ball is movably captured therein, a pair of threaded screws pass through holes located in the ring and project outwardly from the artificial socket away from the arm of the prosthesis, and gripper jaws are threaded onto the outer ends of the screws, the jaws being shaped to fit over portions of the hip bone for securing the artificial socket to the hip bone.