Apparatus for automatically depressurizing a variable-volume inflatable enclosure

摘要

A pneumatic regulator including a constant-volume reference chamber and associated pressure-sensitive inflation and deflation valves is provided to effect a precise linear depressurization of a variable-volume inflatable enclosure, such as a cuff which has been applied to a patient during a blood pressure measurement thereof and pressurized to a value higher than the patient's systolic pressure. By coupling such regulator to the drive for one axis of an X-Y recording chart, the pen or marker of the chart can be precisely scanned along the associated chart axis at the constant depressurization rate of the cuff.