US Patent 7464601 Disposable manometer for use with patient breathing systems

A disposable manometer for use with a breathing system for monitoring a patient during positive pressure ventilation. The disposable manometer includes a housing with an upper and lower portion, a moving member and a flexible rolling diaphragm sealing mechanism between the moving member and the upper portion of the housing. A calibrated tension means resists movement of the moving member and provides accurate measurement of the ventilation pressure.