Single Valve Diaphragm Pump with Decreased Sensitivity to Ambient Conditions
A single valve diaphragm pump is disclosed which generally includes: a pump housing, a flexible diaphragm reciprocally movable in the pump housing, an inlet filter means, and an outlet valve. The flexible diaphragm conforms in shape to a portion of the pump housing when the diaphragm is in its actuation or rest position. The pump eliminates an inlet check valve and replaces it with an inlet filter means. The invented pump has a stroke volume, which is extremely constant even though ambient pressure and reservoir pressure may vary over a considerable range. Furthermore, the invented pump provides a practical means for preventing gas bubbles from entering into the pump chamber. The invented pump can have application as a medication pump for use external to or implanted within a living body.
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