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US 4,711,234 AGranted
Bio-compatible retention pin, and a prosthesis including such a pin
AssigneeSociete Europeen de Propulsion
InventorsMichel Vives, Bernard Buttazzoni
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AssigneeSociete Europeen de Propulsion
InventorsMichel Vives, Bernard Buttazzoni
Estimating the term…
The invention relates to a retention pin for fixing a support plate or other prosthesis on bone tissue. The pin is made of a material which is bio-compatible with human tissue and comprises two half-pins each having a half-head for bearing against the prosthesis and a retention shank projecting therefrom, with the outline of each shank being semi-cylindrical and with the two half-pins being generally symmetrical to each other about a radial separation plane passing at least partially along the axis of the pin and extending at least as far as the inside faces of the half-heads from which the respective retention shanks project. Said shanks being of sufficient length to project beyond a wall of bone by a distance which is not less than the diameter of the fixing hole through the bone, thereby enabling locking means in the vicinity of the free end of the pin to urge the two half-pins apart from each other so as to urge them resiliently over at least a portion of their length against the inside wall of the fixing hole.
A retention pin for fixing a support plate or other prosthesis onto bone tissue, e.g. onto the cortical wall of a bone, said pin being made of a material which is bio-compatible with human tissue and comprising two half-pins each having a respective half-head for bearing against the plate, and a retention shank of generally semi-cylindrical outline, said half-pins being generally symmetrical to each other about a radial separation plane passing at least in part along the pin axis and extending up to the inside face of each half-head from which the respective retention shanks project, each shank being sufficiently long to pass through a wall of bone and to project therebeyond by a distance which is not less than the diameter of the fixing hole through said wall of bone, each shank also including locking means in the vicinity of the free end of the pin suitable for urging the two half-pins apart from each other so as to press them resiliently over at least a portion of their length against the inside wall of the fixing hole.
Dependencies are inferred from the claim text.