Bare-metal stent
Bare-metal stent is a stent without a coating or covering (as used in covered stents drug-eluting stents). It is a mesh-like tube of thin wire. The first stents licensed for use in cardiac arteries were bare metal – often 316L stainless steel. More recent ('2nd generation') stents use cobalt chromium alloy.[1] The first stents used in gastrointestinal conditions of the esophagus, gastroduodenum, biliary ducts, and colon were plastic; bare metal stents were first brought into the clinic in the 1990s.[2]
| Bare-metal stent | |
|---|---|
 A stent diagonally from the front | |
| ICD-9-CM | 00.63, 36.06, 39.90 |
Drug-eluting stents are often preferred over bare-metal stents because the latter carry a higher risk of restenosis, the growth of tissue into the stent resulting in vessel narrowing.[3]
Examples
- Stainless steel: R stent (OrbusNeich), Genous Bio-engineered R stent (OrbusNeich), (J&J, Cordis) BxVelocity, (Medtronic) Express2, Matrix Stent (Sahajanand Medical technologies)
- Cobalt-chromium alloy: Vision (Abbott Vascular); MP35N Driver stent (Medtronic)[4]
- Platinum chromium alloy: Omega BMS (Boston Scientific)[4]
References
- Nikam N et al. Advances in stent technologies and their effect on clinical efficacy and safety. Med Devices (Auckl). 2014 Jun 3;7:165-78. PMID 24940085 PMC 4051714
- Park JS, Jeong S, Lee DH. Recent Advances in Gastrointestinal Stent Development. Clin Endosc. 2015 May; 48(3): 209–215. PMID 26064820 PMC 4461664
- Palmerini T et al. Long-Term Safety of Drug-Eluting and Bare-Metal Stents: Evidence From a Comprehensive Network Meta-Analysis. J Am Coll Cardiol. 2015 Jun 16;65(23):2496-507. PMID 26065988. Lay summary
- Jorge C, Dubois C Clinical utility of platinum chromium bare-metal stents in coronary heart disease. Med Devices (Auckl). 2015 Aug 27;8:359-67. PMID 26345228 PMC 4556305
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