Surgery – Truss – Perineal
Patent
1976-09-30
1977-11-22
Yasko, John D.
Surgery
Truss
Perineal
A61F 504
Patent
active
040591026
ABSTRACT:
A bone screw is provided having leading and trailing end portions with respective threads of opposite hands. The leading end portion will normally be narrower than the trailing end portion, and either or both portions can be tapered towards their leading ends.
REFERENCES:
patent: 2270188 (1942-01-01), Longfellow
patent: 2489870 (1949-11-01), Dzus
patent: 2952254 (1960-09-01), Keating
patent: 3716051 (1973-02-01), Fischer
patent: 3875936 (1975-04-01), Volz
National Research Development Corporation
Yasko John D.
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