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Peristaltic pump

  • US 10,202,971 B2
  • Filed: 12/14/2017
  • Issued: 02/12/2019
  • Est. Priority Date: 12/21/2011
  • Status: Active Grant
First Claim
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1. A peristaltic pump for pumping fluid in a plurality of cycles where each cycle has at least first and second stages, the peristaltic pump comprising:

  • a plunger configured to move toward and away from a tube;

    an inlet valve upstream of the plunger;

    an outlet valve downstream of the plunger;

    a spring configured to bias the plunger toward the tube; and

    an actuator configured to mechanically engage and disengage from the plunger,wherein;

    in the first stage, the inlet valve is opened and the plunger is moved away from the tube by the actuator,in the second stage, the inlet valve is closed, the plunger is moved toward the tube by the spring, and the actuator is mechanically disengaged from the plunger;

    and further wherein,the actuator allows the plunger to move toward the tube under the spring bias to discharge fluid downstream past the outlet valve.

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