A sterile flexible tube with an extremely fine working end that houses an optical fibre and imaging lens intended to be transcutaneously introduced into the coronary vasculature to perform coronary optical coherence tomography (OCT). The proximal end of the device connects to a coronary OCT console for the transmission of high-resolution images (e.g., 5 to 40 micron) of the coronary intravasculature. It is typically made of stainless steel, plastic, and optical materials. This is a single-use device.