A method of forming a tubular body for a catheter, sheath or lead comprises extruding a polymer core having an integrally formed core wall, first lumen, and second lumen, placing a first layer over an outer circumferential surface of the extruded polymer core, and bonding the first layer to the circumferential surface of the extruded polymer cover via a reflow process. The sensor comprises a chemical indicator system disposed within a gap between the distal end of an optical fiber and an atraumatic tip portion, wherein the optical fiber and atraumatic tip portion are coupled by a coupling member, such as a rod or hypotube or cage that traverses the gap. The combination of piston housing and pump head contains a valve which, in response to a suction on one side of the valve, allows water at low pressure to pass through the valve into a receiving chamber, and, in response to a high pressure fluid in the receiving chamber, enables fluid at a high pressure to pass through the valve and eventually to an output port while closing off the input path. An outermost surface of the electrode group includes an exposed portion of either of the positive and negative electrode current collectors. In at least one embodiment an optical element is provided that improves a vision systems capability to accurately measure a spectral characteristic of a distant light source. As a result, an eaves wall for supporting one side of the mini card is formed.