Comparison of BuMA eG Based BioDegradable Polymer Stent With EXCEL Biodegradable Polymer Sirolimus-eluting Stent in "Real-World" Practice

The BuMA stent (SINOMED, Beijing, China) was a novel biodegradable PLGA polymer sirolimus-eluting stent (SES), with design of adding an electro-grafting (eG) base layer between the polymer and the stainless steel stent strut.The eG layer can secure adhesion of the biodegradable PLGA coating as a result of the interdigitation, and the PLGA coating ensures 100% drug release within 30 days.The initial investigation showed a high strut coverage rate in both the BuMA stent and the Xience V stent at 3 months follow-up. Moreover, earlier vascular healing after drug-eluting stent implantation may reduce the incidence of stent thrombosis at follow-up and potentially shorten dual antiplatelet therapy duration. Therefore, we performed this randomized trial to investigate 12 months target lesion failure between the BuMA and the EXCEL stent, both with same eluted drug sirolimus, however different biodegradable polymer carriers.

Inclusion criteria

• The patient must be ≥18 of age;
• Symptomatic ischemic heart disease and/or objective evidence of myocardial ischemia including chronic stable coronary artery disease, or acute coronary syndrome including non-ST-elevation and ST-elevation myocardial infarction;
• Acceptable candidate for CABG;
• The patient is willing to comply with specified follow-up evaluations;
• Patients who agree to accept the follow-up visits.
• Patients can understand the study objectives psychologically and linguistically and show the sufficient compliance to the study protocol. Patients present acceptance of the risks and benefits described in the informed consent form.
• At least one lesion with a diameter stenosis >50% or more suitable for coronary stent implantation in a vessel with a reference diameter ranging from 2.5 mm to 4.0 mm;

Exclusion criteria

• Pregnant or nursing patients and those who plan pregnancy in the period up to 1 year following index procedure.
• Patient has other medical illness (e.g., cancer, known malignancy, congestive heart failure, organ transplant recipient or candidate) or known history of substance abuse (alcohol, cocaine, heroin etc.) that may cause non-compliance with the protocol, confound the data interpretation or is associated with a limited life expectancy (i.e., less than 1 year);
• Patient has a known hypersensitivity or contraindication to aspirin, heparin, clopidogrel/ticlopidine, stainless steel alloy, cobalt chromium, rapamycin , styrene-butylenes-styrene or poly-lactic acid (PLA) polymer, and/or contrast sensitivity that cannot be adequately pre-medicated;
• Any significant medical condition which in the Investigator's opinion may interfere with the patient's optimal participation in the study;
• Currently participating in another investigational drug or device study or patient in inclusion in another investigational drug or device study during follow-up.