Surgery – Instruments – Orthopedic instrumentation
Patent
1990-11-21
1992-03-24
Hafer, Robert A.
Surgery
Instruments
Orthopedic instrumentation
606 79, A61B 1756, A61B 1700
Patent
active
050984357
ABSTRACT:
A bone stabilizing system including an improved guide pin consisting of an elongate solid shaft having one or more drilling teeth and self-tapping threads at a first end and a cross-section partially defined by a non-circular circumference. The system also includes a fixation device which comprises a metal cannula defined by a hollow cylindrical shaft having a drilling teeth at one end, an operating tool receiving means at the other end and a plurality of threads therebetween. The drilling teeth each having cutting surfaces positioned obliquely with first and second directions in a diametric plane extending axially through the cannula. The receiving portion is configured to accept an operating tool to rotatingly advance or withdraw the cannula within the fractured bone. The threads are configured with a non-circular circumference while a portion of the threads are tapered. Intersecting a portion of the threads is at least one flute which is defined by two substantially orthogonal surfaces and an elongate slot which penetrates the wall of the cannula so as to provide fluid communication between the flute and the interior hollow portion of the cannula. A transition zone is provided between the drilling portion and the beginning of the threads. The guide pin is provided with a non-circular surface which, together which the interior hollow portion of the cannula, define a pathway through which bone chips may easily pass.
REFERENCES:
patent: 126366 (1872-04-01), Wills
patent: 2242003 (1941-05-01), Lorenzo
patent: 2278411 (1942-04-01), Braendel
patent: 2388482 (1945-11-01), Haynes
patent: 2526959 (1950-10-01), Lorenzo
patent: 2532296 (1950-12-01), Giesen
patent: 2570465 (1951-10-01), Lundholm
patent: 3457573 (1969-07-01), Patyna et al.
patent: 3554193 (1971-01-01), Konstantinou
patent: 4157677 (1979-06-01), Deutschenbaur
patent: 4175555 (1979-11-01), Herbert
patent: 4341206 (1982-07-01), Perrett et al.
patent: 4383527 (1983-05-01), Asnis et al.
patent: 4388921 (1983-06-01), Sutter et al.
patent: 4414966 (1983-11-01), Stednitz
patent: 4432358 (1984-02-01), Fixel
patent: 4450835 (1984-05-01), Asnis et al.
patent: 4463753 (1984-08-01), Gustilo
patent: 4537185 (1985-08-01), Stednitz
patent: 4632100 (1986-12-01), Somers
patent: 4640271 (1987-02-01), Lower
patent: 4653489 (1987-03-01), Tronzo
patent: 4743260 (1988-05-01), Burton
patent: 4827917 (1989-05-01), Brumfield
patent: 4840632 (1989-06-01), Kampner
Stednitz Denis P.
Stednitz Michael G.
Alphatec Manufacturing Inc.
Brown Michael
Hafer Robert A.
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