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Peristaltic pump with linear flow control

  • US 8,371,832 B2
  • Filed: 12/22/2009
  • Issued: 02/12/2013
  • Est. Priority Date: 12/22/2009
  • Status: Active Grant
First Claim
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1. A peristaltic pump, comprising:

  • a conduit having a first end for receiving a fluid from a reservoir and a second end for delivering the fluid;

    a plurality of fingers, which are disposed at respective locations along a segment of the conduit and are configured to alternately compress and release the conduit at the locations;

    a cyclical pump mechanism, which is coupled to move the fingers between respective compressed and released positions in a spatio-temporal pattern so as to drive a predetermined quantity of the fluid through the segment of the conduit in each pump cycle, wherein said cyclical pump mechanism is characterized by a non-linear flow to phase function;

    a motor, which is coupled to drive the pump mechanism; and

    a controller, which is coupled to activate and deactivate the motor in alternation during each pump cycle with a duty cycle that varies within the pump cycle to substantially compensate for the non-linear flow to phase function.

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