Orthopedic screw for use in repairing small bones
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United States of America Patent
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app pub date -
Mar 7, 2006
filing date -
Jan 28, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An orthopedic screw having a torque driving head with a rounded side a spherical wall for multiaxial use, a self starting, self tapping insertion tip and a threaded portion including a cancellous thread. The threaded portion has a major diameter defined by a spiraling thread and a minor diameter. The head is joined to the threaded portion by an area of from about 2 to about 6 turns of the thread along the longitudinal axis in which the minor diameter tapers by an angle of from about 4 to about 12.degree. and the major diameter of the screw remaining substantially the same meaning that the major diameter is constant to about +/-0.05 mm along the length of the threaded portion. The screw includes a multilobe torque driving recess joined to a cylindrical recess. In a further embodiment, the screw has an insertion tip which is forms a portion of a sphere.
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