Pressure gauge for regulating pressure in a disposable pressure cuff

Apparatus for regulating fluid pressure in a pressure infusion device having an infusion bag, a bladder for containing a fluid under pressure, and a pocket holding the infusion bag in contact with the bladder, wherein said fluid under pressure is supplied by a fluid source, said apparatus comprising:

• conduit for transmitting fluid from said fluid source;
• and
• gauge means, coupled between said fluid source and said bladder by said conduit, for receiving said fluid under pressure from said source and providing said fluid to said bladder, for indicating a range of fluid pressures therein and for maintaining the pressure of fluid in said bladder between minimum and maximum pressures, whereby the pressure of fluid in said bladder is automatically regulated, said gauge means comprising:
• first housing means for receiving a flow of said fluid under pressure, said first housing means comprising a body forming a chamber having an inlet and an outlet and a first member projecting from said body;
• diaphragm means for sealing said chamber;
• second housing means for enclosing said chamber, said second housing means comprising a second member telescopingly coupled to said first member for movement thereupon to indicate a range of pressures of said flow of fluid through said chamber, wherein said diaphragm means is connected between said first housing means and said second housing means;
• a first valve means, formed between said first housing means and said second housing means, for permitting the passage of fluid through said chamber when the pressure of fluid exceeds a minimum pressure;
• and
• a second valve means, formed between said first housing means and said second housing means, for preventing the passage of fluid through said chamber when the pressure of said fluid exceeds a maximum pressure.