A sterile endoscope with a very thin, flexible inserted portion intended for the visual examination and treatment of the lumen and patency of blood vessels (especially to evaluate the patency of veins or arteries). It is inserted into the body through an artificial orifice created by an incision made during the procedure. Anatomical images are transmitted to the user by the device through a fibreoptic bundle (e.g., a fused silica flexible rod that provides sharper images and greater strength than individual strands). It is typically used for visualization of the coronary artery, an arterial bypass procedure with a saphenous vein, or a valvulotomy. This is a single-use device.