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APPARATUS FOR REGULATING THE AMOUNT OF LIQUID ADMINISTERED PER UNIT TIME

  • US 3,790,042 A
  • Filed: 09/15/1970
  • Issued: 02/05/1974
  • Est. Priority Date: 09/15/1970
  • Status: Expired due to Term
First Claim
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1. Apparatus for regulating the amount of liquid administered per unit time to a recipient by an administering apparatus including a drip chamber through which drops of liquid flow in relation to the rate of liquid being administered and a valve controlling the rate of liquid being administered, said regulating apparatus comprising first means for sensing the drops of liquid passing through the drip chamber and producing pulses representing the number of drops, second means for accumulating said pulses and producing a first signal related to the number of pulses received per unit of time, third means for changing the amplitude of said first signal at a rate related to a preselected drip rate, a bi-directional motor connected to said valve, fourth means for generating a reference signal, fifth means for comparing the changed amplitude of said first signal with said reference signal and producing a third signal related to the difference between the signals, and sixth means responsive to said third signal for driving said motor in one direction when said changed signal is greater than the reference signal and in the other direction when said changed first signal is less than said reference signal.

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