Sirolimus – Eluting Biodegradable Polymer Stent System “DES Re-discovered” Abrax TM Sirolimus-Eluting Stent System is designed to perform successfully even in the most demanding cases. The combination of Sirolimus’ antiproliferative action coupled with Rontis’ biodegradable polymer and proven balloon catheter ensures effective treatment of clinically difficult lesions with confidence. This essentially means that patients who receive Abrax TMare a lot less likely to need another repeat procedure in the short term.