Cassette with infusion set containing spring-biased anti-freeflow mechanism for peristaltic infusion pump

A flow control system comprising:

• a pumping device comprising an actuation member;
• a cassette removably attached to the pumping device, the cassette comprising a housing comprising a flow restrictor comprising a locking member and a spring, the flow restrictor so constructed and arranged to align with the actuation member when the cassette is positioned within the pumping device;
• and
• a flexible tube attached to the housing and positioned adjacent the flow restrictor.

A method of controlling fluid flow in a tube, the method comprising:

• providing a cassette comprising a housing having a flow restrictor and a stopper, and a tube attached to the housing and positioned adjacent the flow restrictor;
• occluding fluid flow through the tube by positioning an occluding portion of the flow restrictor at a location proximate the stopper;
• and
• passing fluid through the tube by positioning the occluding portion of the flow restrictor at a location away from the stopper.