Corrosion Behavior of Platinum-Enhanced Radiopaque Stainless Steel (PERSS®) for Dilation-Baloon Expandable Coronary Stents
Dilation-balloon expandable coronary stents are commonly made of implant grade stainless steels conforming to ASTM F138/F139, e.g., Biodur? 316LS (UNS S31673). Typical of such stents is the Boston Scientific/Interventional Technologies? (BS/IVT) LP-StentTM. In 2000, BS/IVT determined that the addition of 5 to 6 wt % platinum to Biodur 316LS produced a stainless steel with enhanced radiopacity to make their stents more visible radiographically and thus more effective clinically. A goal of the program was to ensure platinum additions would not adversely affect the corrosion resistance of Biodur 316LS. The corrosion resistance of 5-6 wt % PERSS? alloys and Biodur 316LS was determined using electrochemical tests for general, pitting, crevice and intergranular corrosion. Experimental methods included ASTM A262E, F746, F2129, and potentiodynamic polarization. The 6 wt % PERSS? alloy (IVT 78) had a resistance to pitting, crevice and intergranular corrosion that was similar to the Biodur 316LS base material. IVT 78 was a single-phase austenitic alloy with no evidence of inclusions or precipitates. It was more resistant to pitting corrosion than 5 wt % PERSS? alloys. Performance of the PERSS? alloys was not a function of alloy oxygen content in the range 0.01 to 0.03 wt %.
- Research Organization:
- Albany Research Center (ARC), Albany, OR (United States)
- Sponsoring Organization:
- Boston Scientific/Interventional Technologies, Inc. (3574 Ruffin Rd., San Diego, CA 92123)
- OSTI ID:
- 812550
- Report Number(s):
- DOE/ARC-2003-004; Reimbursable Funds-In Agreement C008; TRN: US200706%%502
- Resource Relation:
- Conference: Stainless Steels for Medical and Surgical Applications, Pittsburgh, PA, May 6-7 2002, published as ASTM STP 1438, pp. 176-193, ©2003; Other Information: Presented at conference in May 2002; published in Proceedings (which was an ASTM STP) in 2003
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALLOYS
CORROSION
CORROSION RESISTANCE
INTERGRANULAR CORROSION
OXYGEN
PERFORMANCE
PITTING CORROSION
PLATINUM
PLATINUM ADDITIONS
POLARIZATION
STAINLESS STEELS
biomedical materials
coronary stents
corrosion
pitting corrosion
stainless steel
platinum
alloy
Ringers solutipn
breakdown potential
radiopacity
x-rays