Surgery – Instruments – Orthopedic instrumentation
Patent
1989-11-08
1990-07-24
Hafer, Robert A.
Surgery
Instruments
Orthopedic instrumentation
606 69, A61B 1758
Patent
active
049432923
ABSTRACT:
An implantable plate for joining together two pieces of a broken bone is formed to have a plurality of elongated holes for the screws that fasten the plate to the bone on both sides of the fracture. The screws are positioned at the end of the elongated hole that is farthest from the fracture. The portion of each elongated hole that is not occupied by the screw is filled with a cushion of elastic material that may be deformed elastically when the screw shank is pressed against it, thereby allowing lateral movement of the screw in the hole. When the plate is implanted in the body of a person and fastened to a fractured bone by means of screws through the elongated holes, the plate stabilizes the bone pieces but permits the screws, and hence the bone pieces, to move a short distance back and forth in the direction of the axis of the bone in order to promote healing.
REFERENCES:
patent: Re28241 (1976-06-01), Allgower et al.
patent: Re31628 (1984-07-01), Allgower et al.
patent: 2486303 (1949-10-01), Longfellow
patent: 3596656 (1971-08-01), Kaute
patent: 3779240 (1973-12-01), Kondo
patent: 4297993 (1981-11-01), Harle
patent: 4338926 (1982-07-01), Kummer et al.
patent: 4408601 (1983-10-01), Wenk
patent: 4524765 (1985-06-01), de Zbikowski
Hafer Robert A.
Leman John F.
National Research Council of Canada
Rooney Kevin G.
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