Surgery – Truss – Perineal
Patent
1988-04-21
1989-09-05
Hafer, Robert A.
Surgery
Truss
Perineal
128 92YY, A61F 504
Patent
active
048628832
ABSTRACT:
An intramedullary nail comprising an elongate tubular rod with upper proximal and lower distal ends and positioned within and extending longitudinally of the intramedullary canal of a fractured bone. A pair of adjacent, elongate anchor blades with upper and lower ends are positioned with their upper end portions within a transverse slot in the distal end of the rod and are connected therewith by a single transverse pivot pin. The blades normally extend downwardly from the rod and are pivoted radially outwardly from opposite sides of the rod to deployed positions where they establish anchoring engagement within the bone. The blades have cam parts and stop edges at their upper ends. An elongate setting tool is slidably engaged in and shiftable downwardly in the rod. The tool has a downwardly-disposed surface normally engaging said cam parts to pivot the blades to their deployed positions when the tool is moved downwardly and to establish stopped engagement with said stop edges when the blades are deployed. An elongate anchor screw is engaged transversely through the upper end portion of the bone and is engaged through openings in the rod and the tool to anchor the upper end of the rod in and with the upper end of the bone and to lock the tool in the rod with said surface and edges in stopped engagement. Inserting, guide and reaction tools are provided to facilitate implantation of the device in the bone.
REFERENCES:
patent: 4227518 (1980-10-01), Aginsky
patent: 4275717 (1981-06-01), Bolesky
patent: 4519100 (1985-05-01), Wills et al.
patent: 4632101 (1986-12-01), Freedland
patent: 4721103 (1988-01-01), Freedland
Hafer Robert A.
Maxwell Georges A.
Sam Charles H.
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