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Liquid infusion apparatus

  • US 7,553,295 B2
  • Filed: 11/10/2005
  • Issued: 06/30/2009
  • Est. Priority Date: 06/17/2002
  • Status: Active Grant
First Claim
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1. An infusion apparatus having drive circuitry for an ultrasonic motor, comprising:

  • an oscillator that generates an output at a frequency;

    a circuit connected to receive the output from the oscillator to produce recurring output pulses at spaced intervals on a plurality of output terminals;

    a pair of air-core transformers, each having a secondary winding to connect to the ultrasonic motor, and having a pair of primary windings to conduct current therethrough in alternating relationship in response to output pulses from separate ones of pairs of the plurality of output terminals; and

    a cam shaft coupled to the ultrasonic motor, the cam shaft further coupled to a plurality of pump elements, wherein rotation of the cam shaft by the ultrasonic motor manipulates the plurality of pump elements to adjust a pinch point along a tubing, thereby controlling an infusion fluid flow rate.

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