Inflation rate control circuit for blood pressure cuffs

Details Inflation rate control circuit for blood pressure cuffs Inflation rate control circuit for blood pressure cuffs

A - Human Necessities

61

B

73/101, 326/13.5

A61B 5/022 (2006.01) A61B 5/0225 (2006.01)

Patent

CA 1333339

A blood pressure monitor having a motor driven air pump for inflating an blood pressure cuff, and a control system for controlling the voltage applied to the motor to regulate the rate at which the cuff is inflated The control system utilizes a microprocessor to calculate a desired inflation rate and then compare the desired inflation rate with the actual inflation rate to generate a control signal in the form of a pulse-width modulated square wave. The square wave is low-pass filtered to generate a voltage reference that is applied to one input of a comparator. The other input of the comparator receives a feedback signal indicative of the voltage applied to the motor. The comparator generates a square wave having a duty cycle that is a determined by the polarity of the comparison at its inputs. The square wave modulates a semi-conductor switch which, in turn, controls the voltage applied to the motor.

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