An integrated fuel management system and method for controlling the fuel storage and delivery in a vehicle. A method of venting a medical device may include providing a vascular access device as part of an extravascular system, providing a gas permeable vent within the vascular access device, venting gas from the system through the vent, and closing the vent. A composite scaffold which is preferably a two-layer system may be formed having an outer surface of a layer of the porous matrix formed of the copolymer, and an outer surface of a layer of a ceramic material.