A pressure gauge which may be operably coupled to a fluid pressure supply device and a balloon catheter. The pressure gauge includes a mechanism which impedes a contaminant, such as corrosion and acid flux, from entering the pressurized fluid being measured. In one embodiment, this mechanism may include...http://www.google.es/patents/US4790821?utm_source=gb-gplus-sharePatente US4790821 - Pressure gauge and system
