An endovascular catheter device capable of heat and gas exchange with a patient’s bloodstream comprises a catheter shaft, a heat exchanger, and a gas exchange element. to produce an amphiphilic block copolymer of the 4-vinylpyridine and monomer containing ethylenic unsaturation. The resulting rules or concept signatures are evaluated by a rule engine to determine the degree to which the underlying concepts are reflected in a given set of code. Thermal interface material may be filled in between the rigid plate, circuit board and spring clip to provide an efficient thermal path to ambient. The light emitting device includes an oxide including gallium aluminum over a gallium oxide substrate, a nitride including gallium aluminum over the oxide including gallium aluminum, and a light emitting structure over the nitride including gallium aluminum. The arbor wall may be directly contacted and supported by a plurality of corrugations extending radially therefrom.