A sterile, long and thin flexible tube inserted percutaneously into the vasculature and connected to a supersaturated oxygen (SSO2) therapy system for the infusion of autologous blood mixed with an SSO2 solution (producing oxygen-enriched hyperoxaemic blood) to a targeted coronary artery. It is typically an over-the-wire (OTW) catheter with a radiopaque marker band for fluoroscopic visualization. This is a single-use device.