Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1994-09-12
1997-07-08
Isabella, David
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
623 23, A61F 230, A61F 232
Patent
active
056456000
ABSTRACT:
A two-part prosthesis, including a stem and head portion, for a hip or other joint is provided. Briefly stated, a intramedullary stem is provided having flexibility that is comparable to that of the surrounding bone. The intramedullary stem comprises a strong and resilient core that is coated with a biocompatible material. The flexibility of the stem distributes the loading forces from the joint more uniformly over the supporting bone with the result that bone degeneration from stress shielding is minimized or eliminated. Additionally, the prosthesis head is made of entirely biocompatible materials and is shaped so as to fit conventional joint sockets. The modular, two-part structure of the prosthesis allows the stem and head portions to be selected to provide the best fit for the patient.
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J. Dennis Bobyn; "Flexibility Must Increase in Femoral Stem"; Orthopedic Special Edition, vol. 2 No. 10, 1993; pp. 14 and 20.
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