| 摘要 |
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 a piston positioned in a piston chamber. The piston has at least one, and preferably two, O-rings nested therearound to provide a seal with the piston chamber's wall. The piston may include an inter-gasket pressure chamber positioned between two O-rings which is communicated to the top or bottom of the piston, resulting in pressure equilibrium. Several inter-gasket pressure chambers may be provided.
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