The Carpentier-Edwards Bioprosthetic Valved Conduit (Model 4300) is made from a porcine (pig) aortic valve that has been preserved and mounted on a flexible frame. The flexible frame is composed of a corrosion resistant cobalt chromium metal alloy, silicone rubber, and is covered with polytetrafluoroethylene (PTFE) cloth. The valve is then mounted in a polyester tube. This device can be used to create an extra-cardiac pathway for blood flow in the pulmonic position. This conduit was introduced in the 1970’s.