Abstract: The present invention is an improved tubular device for carrying liquids or gases that is resistant to leakage following a puncture. In its preferred form, the tubular device employs two or more concentrically mounted tube elements that are adapted to move relative to one another following puncture and removal of the puncturing device. This relative movement creates a discontinuous opening through the device that is resistant to fluid leakage. The device may likewise be constructed to cause at least one of the puncture holes to contract, thus further limiting fluid loss. The device of the present invention is particularly useful as an implantable device, such as a vascular graft.