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US 5,176,712 AGranted
Endoprostheses with resorption preventing means
AssigneeTranquil Prospects Ltd.
InventorCharles A. Homsy
Life of this patent
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Abstract
The endoprosthesis is adapted for insertion into a socket formed within the medullary canal of a patient's bone. It comprises an elongated stem defining a proximal region, a distal region, and a tip. A soft porous pad extends distally from the stem tip. The pad has a thickness greater than two millimeters. The distal region is preferably biocompatible, porous, soft, resilient, deformable, and tissue-ingrowth promoting.
Claims12
An endoprosthesis for insertion into a socket formed within the medullary canal of a patient's bone, comprising:
- an elongated stem having an outer region including:
- a proximal region, a distal region, and a distal tip;
- said distal tip having an energy-absorbing, biocompatible, resilient, soft, porous member having a thickness, measured in the axial direction of said stem, that is greater than two millimeters, and having a compressive stress per unit of strain which is substantially smaller than that of apposite cortical bone within said medullary canal;
- and
- at least a portion of said proximal region of said stem having integral therewith a biocompatible, porous and hard means which promotes tissue-ingrowth, and said hard means having a modulus of elasticity at least as great as that of cancellous bone.
2 more elements
Dependencies are inferred from the claim text.