• Detachment of an EluNIR Drug-Eluting Stent Spring Tip

    A 48-year-old man with a medical history of diabetes and tobacco use presented with a non-ST elevation myocardial infarction. Coronary angiogram showed single-vessel disease with a 90% mildly calcified, non-tortuous lesion in the proximal left anterior descending artery. An EBU 3.5 6F guide catheter (GC) (Medtronic, CA, USA) was used for cannulation, the lesion was wired with a 0.014” BMW wire (Abbott Vascular, CA, USA). Direct stenting was performed using an EluNIR 3.5 × 15 mm drug-eluting stent (Cordis, FL, USA). Only mild resistance was encountered during stent delivery into the lesion. After stent deployment, a good angiographic result was achieved with Thrombolysis in Myocardial Infarction 3 flow. Retrieving the stent's balloon from the GC's proximal end was challenging because significant resistance was encountered, and an increased amount of force had to be applied to retrieve the balloon outside the GC. A coil-shaped metal component was seen on the wire, distal but not attached to the stent's balloon tip (Fig. 1). It appears to be the stainless-steel spring tip incorporated into the EluNIR stent to facilitate crossing challenging lesions without tearing or buckling the tip. Notably, the stent was prepared following the “Instructions for Use” and no damage was noticed on the package. To our knowledge, this is the first case of such detachment, and the etiology is unclear. No harm occurred to the patient.

    Author bio

    Cardiovascular Revascularization Medicine Volume 27, June 2021, Pages 98-99


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