Shock absorbent prosthetic hip joint
AssigneeAntoine A. Nassar
InventorsAntoine A. Nassar, Eugene C. Eckstein
Life of this patent
Estimating the term…
Abstract
A shock absorbent prosthetic hip joint is provided, including a socket section that is attachable to the pelvic bone and a ball section that is pivotably engaged with the socket section. There is a first shock absorber section attached to the ball section and a second shock absorber section attached to an upper part of the femur bone. The second shock absorber section slidably engages the first shock absorber section. A spring is disposed between the first and second shock absorber sections for cushioning a compressive force applied between the femur and pelvic bones.
Claims11
A shock absorbent prosthetic hip joint comprising:
- a ball section that is pivotably engaged with a socket section connected to a pelvic bone;
- a first shock absorber section attached to and extending from said ball section and including a piston that has a substantially solid cross section;
- a second shock absorber section attached to an upper part of a femur bone and including an insert configured for insertion into the intramedullary cavity, said insert having an axial chamber formed therein for slidably receiving said piston and permitting said piston to reciprocate in said chamber;
- and
- spring means disposed in said chamber and interengaging a distal end surface of said piston and an inner end of said axial chamber, said distal end surface faces a direction generally opposite to said ball section;
- said spring means being configured for biasing said first and second shock absorber sections into an expanded condition wherein said ball section is spaced relatively apart from the femur bone
- and being responsive to application of a compressive load between the femur and pelvic bones for allowing said first and second shock absorber sections to slide into a compressed condition to cushion said compressive load.
A shock absorbent prosthetic hip joint comprising:
- a socket section that is attachable to a pelvic bone;
- a ball section pivotably engaged with said socket section;
- a first shock absorber section attached to said ball section;
- a second shock absorber section attached to an upper part of a femur bone and having means for slidably engaging complementary means in said first shock absorber section, said means for slidably engaging including an elongate chamber and said complementary means including a piston mounted for reciprocating slidable motion in said chamber and further including a slide pin extending through said chamber, said piston having a generally axial groove for slidably receiving said slide pin;
- and
- spring means disposed between said first and second shock absorber sections for biasing said first and second shock absorber sections into an expanded condition wherein said ball section is spaced relatively apart from said femur bone;
- said spring means being responsive to application of a compressive load between the femur and pelvic bone for allowing said first and second shock absorber sections to slide into a compressed condition to cushion said compressive load;
- said spring means including a first helical compression spring disposed about said slide pin and extending between a distal end of said piston and an inside end of said chamber and a second helical compression spring disposed in said groove and extending between an inside end of said groove and a distal end of said slide pin;
- said slide pin extending through and from the femur bone and said second shock absorber section further including a mounting plate attached to said slide pin for engaging the outside surface of the femur bone and means for securing said mounting plate to the femur bone.
Dependencies are inferred from the claim text.