Catheters adapted to exchange heat with a body fluid flowing through a body conduit employ helical elongate lumens for heat transfer with the body fluid. A clamp removes separate articles in each parallel path. Hence, the surface of the transparent epoxy resin is dented in the center portion so that the outer edge portion becomes higher than the center portion. The signaling node sends a location request that includes the local access DN to an HLR. An electrical circuit includes LED lamps mounted in a lower one of the pair of skins with its illumination directed downwardly.