The pump is designed to dispense fluid nutrient at a selectable constant rate from a disposable, flexible plastic bag having a flexible enteric feeder tube attached to it. The bag is suspended from the pump frame with the outlet of the bag and the enteric feeder tube lowermost. The lower portion of the...http://www.google.com.hk/patents/US4421506?utm_source=gb-gplus-share專利 US4421506 - Flow-regulating enteric feeding pump
