Liquid metal containment in an x-ray tube. At first, a layout pattern is provided to a computer system. 001 to 15 weight percent of a water soluble modified cellulose, non-saccaride water soluble polymer, 0 to 15 weight percent phosphorus compound, 0. For example, it may be desired to orient the distal tip of the guidewire shaft towards a target vessel of a bifurcation or the balloon catheter may be used to bypass a Chronic Total Occlusion. The bottom face of the retaining ring extends downward from an inner portion adjacent the retaining face to a lowermost portion radially outboard of the retaining face.