Patent ID: 7422559

Claim:
An insertion tube remote viewing device comprising: an insertion tube having a wall and carrying at least one of an articulation cable, a fiber bundle, and a wire bundle, wherein said wall is of a multilayer stacked up construction; a fluid supply system; and a camera head assembly disposed at a distal end of said insertion tube, wherein said multilayer wall of said insertion tube is devoid of material having a melting temperature lower than about 400° (degrees) Fahrenheit; wherein said multilayer wall includes a layer selected from the group consisting of nonporous polytetrafluoroethylene, meta-phenelyneisophthalamide, and poly-paraphenylene terephthalamide, and wherein said multilayer wall further includes a layer of porous fiberglass having a thermal conductivity of less than 0.50 BTU-in/(hr-ft 2 -F.°); and wherein said insertion tube remote viewing device is configured to receive fluid from said fluid supply system.