10 Medical devices, namely, diagnostic and therapeutic devices for use in gastroenterology, radiology, cardiology, urology, gynecology, surgery, critical care and veterinary fields, namely, wire guides, catheters, introducers, needles, stop cocks and fittings, gauges, sheaths, stents, balloons, dilators, biopsy devices, injectors, syringes, vena cava filters, retrieval snares, retrieval baskets, occluding spring emboli for arterial and venous embolization, patient immobilization devices, sutures and plastic tubing for use in medical devices; medical x-ray apparatus and accessories, namely, markers, labels, sterile protective equipment covers, radiograhic rulers, vessel compressors, protective aprons, and holding stands for protective aprons; and biological tissue for use as medical grafts, namely, naturally occurring extra cellular matrix derived from porcine small intestine for use on wounds and organs