Neck-slip-prosthesis
First Claim
Patent Images
1. A femoral component for an artificial hip joint for uncemented implementation characterized by:
- a prosthesis comprising a stem having a proximal end, a remote tip end, a dorsal side, a ventral side, a medial side, and a lateral side, the stem having a central axis configured to be substantially coaxial with a femoral canal in which the stem is placed;
the stem having a concave indentation on the dorsal side extending axially from the proximal end toward the tip and engaging the bone structure of a femoral neck at a transition region to a greater trochanter of the femur;
the stem concave indentation being symmetrical right to left from a center;
the proximal end of the stem having a stem section medial side configured to mate with internal structures of the femoral neck of the femur;
a cone for mounting a replacement femur head on the proximal stem section;
the proximal stem section having a support surface for the cone and the stem proximal section joining a lateral stem section that fits into the femoral canal of the femur;
the length of the stem along the central axis being between 4.5 cm and 11 cm; and
the stem proximal section having an outer surface configured to contact the inside of the femoral neck dorsally, medially and ventrally through its concave shape.
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Accused Products
Abstract
A hip prosthesis constructed to transfer forces to the femur without relative movements that cause failures. The prosthesis stem has an open sided central bore. The proximal end of the prosthesis is configured to seat against interior surfaces of the femoral canal and support a femur head on a prosthesis shoulder that seats on the stem proximal end while maintaining the neck of the femur intact.
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Citations
8 Claims
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1. A femoral component for an artificial hip joint for uncemented implementation characterized by:
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a prosthesis comprising a stem having a proximal end, a remote tip end, a dorsal side, a ventral side, a medial side, and a lateral side, the stem having a central axis configured to be substantially coaxial with a femoral canal in which the stem is placed;
the stem having a concave indentation on the dorsal side extending axially from the proximal end toward the tip and engaging the bone structure of a femoral neck at a transition region to a greater trochanter of the femur;
the stem concave indentation being symmetrical right to left from a center;
the proximal end of the stem having a stem section medial side configured to mate with internal structures of the femoral neck of the femur;
a cone for mounting a replacement femur head on the proximal stem section;
the proximal stem section having a support surface for the cone and the stem proximal section joining a lateral stem section that fits into the femoral canal of the femur;
the length of the stem along the central axis being between 4.5 cm and 11 cm; and
the stem proximal section having an outer surface configured to contact the inside of the femoral neck dorsally, medially and ventrally through its concave shape. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A femoral component for an artificial hip joint for transferring forces to a femur in which the prosthesis is mounted, the prosthesis comprising:
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a stem having a lateral portion and a proximal portion, said lateral portion having a central axis configured to be substantially coaxial with and to fit within a femoral canal in which the stem is placed;
the proximal portion having a surface configuration to seat against interior surfaces of the femur adjacent an osteotomy across the femoral neck and to an extension of the greater and lesser trochanters, the femur neck being left substantially intact when the femur head is removed for insertion of the prosthesis into the femoral canal, the prosthesis stem having a bore with a central axis substantially coinciding in with the axis of the femoral canal, said bore being open to an exterior of the stem along a lateral side thereof such that the stem can flex when inserted in the femoral canal. - View Dependent Claims (8)
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Specification