Fixation elements for artificial joints
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United States of America Patent
Stats
-
May 5, 1987
Grant Date -
N/A
app pub date -
Nov 21, 1983
filing date -
Nov 21, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Fixation elements for the socket portions of artificial ball and socket joints are provided which include a self-tapping screw thread, a plurality of cutting teeth and a spherical dome. A spherically-shaped cavity having a radius either approximately equal to or slightly greater than the radius of the spherical dome of the fixation element is reamed into a bony structure. The fixation element is screwed into the cavity using the self-tapping screw thread. The cutting teeth form an aperture in the cavity in advance of the self-tapping thread to aid the thread in cutting into the walls of the cavity. In certain embodiments of the invention, a family of fixation elements is provided having related threads with at least a portion of the thread increasing in size from the smallest to the largest member of the family.
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