SEDL / STP / STP1438-EB / STP11163S

Corrosion Behavior of Platinum-Enhanced Radiopaque Stainless Steel (PERSS^®) for Dilation-Balloon Expandable Coronary Stents

Covino, BS
Research Chemist, Albany Research Center, U.S. Department of Energy, Albany,OR

Craig, CH
Principal Engineer and Vice President for Research & Development, Boston Scientific Corporation/Interventional Technologies, San Diego,CA

Cramer, SD
Chemical Engineer, Albany Research Center, U.S. Department of Energy, Albany,OR

Bullard, SJ
Research Chemist, Albany Research Center, U.S. Department of Energy, Albany,OR

Ziomek-Moroz, M
Research Chemist, Albany Research Center, U.S. Department of Energy, Albany,OR

Jablonski, PD
Metallurgist and Division Chief, Albany Research Center, U.S. Department of Energy, Albany,OR

Turner, PC
Metallurgist and Division Chief, Albany Research Center, U.S. Department of Energy, Albany,OR

Radisch, HR
Principal Engineer and Vice President for Research & Development, Boston Scientific Corporation/Interventional Technologies, San Diego,CA

Gokcen, NA
Consultant, Thermodynamics and Inorganic Materials, Palos Verdes Estates,CA

Friend, CM
Professor and Head, and Senior Lecturer, Cranfield Postgraduate Medical School, Shrivenham,Swindon

Edwards, MR
Professor and Head, and Senior Lecturer, Cranfield Postgraduate Medical School, Shrivenham,Swindon

Pages: 18    Published: Jan 2003

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Source: STP1438-EB

Abstract

Dilation-balloon expandable coronary stents are made of implant grade stainless steels, UNS S31673, e.g., BioDur^® 316LS. Boston Scientific/Interventional Technologies (BS/IVT) determined that addition of platinum to UNS S31673 could produce a stainless steel with enhanced radiopacity, which made such stents more visible radiographically. A goal of the program was to ensure the platinum additions would not adversely affect the corrosion resistance of the resulting 5–6 wt % PERSS^® alloys. Corrosion resistance of PERSS and BioDur 316LS was determined using electrochemical tests for general, pitting, crevice and intergranular corrosion. Experimental methods included A262E, F746, F2129, and potentiodynamic polarization. The ∼ 6 wt % PERSS alloy (IVT 78) had a resistance to pitting, crevice and intergranular corrosion similar to base materials. IVT 78 was a single-phase austenitic PERSS alloy with no evidence of inclusions or precipitates; it was more resistant to pitting corrosion than the ∼ 5 wt % PERSS alloys. PERSS performance was not a function of oxygen content in the range 0.01 to 0.03 wt %.

Keywords:
coronary stents, corrosion, stainless steel, platinum, alloy, Ringers solution, pitting corrosion, breakdown potential, radiopacity, x-rays

Paper ID: STP11163S
Committee/Subcommittee: F04.93
DOI: 10.1520/STP11163S
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