Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1984-06-04
1988-01-12
Larson, Lowell A.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
623 23, 148 12E, 72700, A61F 504
Patent
active
047189088
ABSTRACT:
A surgical implant manufactured from austenitic stainless steel by cold-forging has improved mechanical properties and corrosion fatigue resistance. The grain-size index for the cold-forged 316L stainless steel is increased from an ASTM grain-size index of about 8 to an ASTM grain-size index of about 14 by cold-forging the steel into the desired shape. Further improvement in mechanical properties and corrosion fatigue resistance is obtained by stress relieving the material after cold-forging into the desired configuration. The microstructure of the cold-forged material is characterized by the absence of visible slip planes at 600.times. magnification, in contrast with visible slip planes present in the microstructure of the austenitic stainless steel starting material.
REFERENCES:
patent: 2358799 (1944-09-01), Franks
patent: 3100729 (1963-08-01), Goller
patent: 3284250 (1966-11-01), Yeo et al.
patent: 3340048 (1967-09-01), Floreen
patent: 3740274 (1973-06-01), Chow
patent: 3871925 (1975-03-01), Nunes
patent: 4429690 (1984-02-01), Pievani
Handbook of Stainless Steels, Peckner & Bernstein, 1977, pp. 42-6 to 42-10, "Surgical Implant Manufacturing", McGraw-Hill Co.
Baswell Imogene
Garner Steve
Gordon Barry
Wigginton Robert E.
Larson Lowell A.
Richards Medical Company
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