F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
103/32
F04B 43/00 (2006.01) A61M 5/142 (2006.01) F04B 43/04 (2006.01) F04B 53/10 (2006.01)
Patent
CA 1233363
Single Valve Diaphragm Pump with Decreased Sensitivity to Ambient Conditions Abstract A single value diaphragm pump is disclosed which generally includes: a pump housing (58,60), a flexible diaphragm reciprocally movable in the pump housing; an inlet filter means (80); and, an outlet valve (70). The flexible diaphragm conforms in shape to a portion (62) of the pump housing (58) when the diaphragm is in its actuation or rest position (54a). Similarly, the flexible diaphragm conforms in shape to another portion (64) of the pump housing (60) when the diaphragm is in its fully extended position (54b). The pump eliminates an inlet check valve and replaces it with an inlet filter means (80). The pump has a stroke volume which is extremely constant even though ambient pressure and reservoir pressure may vary over a considerable range. Furthermore, the pump provides a practical means for preventing gas bubbles from entering into the pump chamber, The pump can have application as a medication pump for use external to or implanted within a living body.
482432
Smart & Biggar
The Johns Hopkins University
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