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Infusion pump

  • US 4,919,650 A
  • Filed: 03/29/1988
  • Issued: 04/24/1990
  • Est. Priority Date: 03/30/1987
  • Status: Expired due to Fees
First Claim
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1. A method of controlling an infusion pump, said pump including a motor adapted to impart continuous rotary motion via an output shaft, said pump further including encoding means adapted to provide data indicative of rotational motion of said output shaft, said data being proportional to the angular displacement of said output shaft;

  • said method comprising providing power to said motor only for a first period of time within a time window during which first data is produced from said encoding means;

    monitoring second data received from said encoding means during a second period of time immediately following said first period of time during said time window;

    comparing said first and second data with desired data corresponding to a predetermined volume feed rate of said infusion pump and, on the basis of said comparison, determining whether and for how long to energize said motor during subsequent window periods.

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