Two metal families dominate coronary stent platforms on the market today: stainless steel and cobalt-chromium alloys. Neither is universally "better" — each carries a different set of mechanical tradeoffs that interact with strut thickness, radial strength, and deliverability in ways that matter to how a stent performs in a given lesion. This comparison looks at the general material properties behind stainless steel vs cobalt-chromium stent platforms and explains why the choice between them is a clinical judgment rather than a fixed rule.
What Are the Basic Material Differences Between the Two Alloys?
316L stainless steel is the textbook-standard alloy historically used across many implantable medical devices, valued for its established manufacturing familiarity, corrosion resistance, and long clinical track record as a base material in coronary stents. Cobalt-chromium alloys, by contrast, are generally recognized in materials science as offering higher radial strength relative to their cross-sectional area than stainless steel, which allows manufacturers to design thinner struts while still achieving adequate scaffolding support for the vessel wall. This is a well-established, generic materials science distinction rather than a claim specific to any single product — it is the reason cobalt-chromium became a common choice for newer-generation thin-strut stent platforms across the industry.
How Does Alloy Choice Affect Strut Thickness and Deliverability?
Because cobalt-chromium can achieve comparable or greater radial strength at a thinner cross-section than stainless steel, cobalt-chromium platforms are often associated with thinner strut profiles. Thinner struts are generally thought to be associated with easier vessel crossing and potentially more favorable healing characteristics, since less foreign material is left in contact with the vessel wall relative to bulkier designs. Stainless steel platforms, needing comparatively thicker struts to achieve similar radial strength, may trade some of that thin-strut advantage for the benefits of a well-established, extensively used base material. Neither tradeoff makes one alloy universally superior — the practical impact depends on the specific strut and stent design built around the chosen material, not the alloy alone.
Does One Alloy Offer Better Long-Term Performance Than the Other?
There is no basis for declaring one alloy category categorically superior in long-term performance — outcomes depend on the complete stent design (strut pattern, coating technology if drug-eluting, and deployment technique), the specific lesion being treated, vessel size, and patient-specific healing response, not the base metal in isolation. Both stainless steel and cobalt-chromium platforms have extensive use in coronary intervention, and other cobalt-chromium and stainless-steel platforms exist across the industry with their own design characteristics. Selecting between them — or between specific products built from either — is a decision made by the interventional cardiologist based on lesion anatomy, vessel size, calcification, and the physician's experience with a given platform.
Two INVAMED Platforms Built on Different Alloys
INVAMED offers coronary stent platforms built on both alloy families. The ATLAS Drug Eluting Coronary Stent System (Cobalt Chromium) is a next-generation cobalt-chromium platform using a thin-strut, 60 µm L605 alloy design with a sirolimus drug coating at 1 µg/mm², intended by the manufacturer to reduce restenosis while offering trackability for complex or calcified lesions, with a nominal pressure of 9–10 atm and a manufacturer-rated burst pressure of 14–16 atm. The Atlas Coronary Stent System (Stainless Steel) is INVAMED's stainless-steel coronary stent platform, offering an alternative built on the long-established 316L-type base material used broadly across the medical device field. Both platforms are part of INVAMED's coronary artery disease and cardiac interventions offering, and the choice between them for any specific patient rests with the treating physician.
Why do some newer stent platforms use cobalt-chromium instead of stainless steel?
Cobalt-chromium alloys generally allow thinner struts to be used while maintaining adequate radial strength, compared to stainless steel at the same strength level, which is a widely recognized reason the material became common in newer thin-strut stent platform designs. This is a general materials characteristic and does not mean every cobalt-chromium stent outperforms every stainless steel stent, since overall performance depends on the complete device design.
Device availability and regulatory status vary by country. Please contact INVAMED or your authorized local distributor for current regulatory information applicable to your region.