A flexible tube intended to be used for the percutaneous transluminal passage and placement of a diagnostic/interventional catheter, lead (e.g., pacing lead, balloon dilatation catheter), needle or guidewire through its lumen(s), within the vascular system. It may be rigid or flexible, non-steerable or steerable, single or multiple lumen(s), and the distal section can have a variety of preformed shapes. It is not intended solely for infusion nor to access superselective small vessels, and does not include a transseptal needle. A percutaneous introduction set, shaft visualization electrodes, or haemostatic valve may be supplied with the guide-catheter. This is a single-use device.