Screw and driver
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 18, 1992
Issued Date -
N/A
app pub date -
Sep 5, 1990
filing date -
Feb 6, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A screw and driver combination designed so that the screw is releasably axially couplable with the driver and so that the screw is positively rotatably engageable with the driver. The screw comprises an axial bore of circular cross section and a counterbore of polygonal cross section. The driver comprises a radially-compressible front portion sized to engage the axial bore of the screw with a minor spring interference fit and an intermediate portion sized to positively rotatably engage the counterbore of the screw. The screw and driver may be adapted for use with a guide wire insertion system by providing axial bores extending through the entire lengths of the screw and driver. The driver may include a mechanical expansion assembly for causing said said front portion to expand radially.
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