Infusion pump

Details Infusion pump Infusion pump

1979-05-31

1981-06-30

Freeh, William L.

Pumps

Expansible chamber type

Distributor formed from integral portion of flexible wall...

128214F, 417540, F04B 4314, A61M 500

Patent

active

042760046

ABSTRACT:
The present infusion pump has a housing with an insert in the housing which s closed by a cover. The insert has a bore defining the pump volume. The insert also defines passageways and at least one chamber in the pump. One of two membranes is held between the insert and the pump housing and forms an inlet valve. The other membrane is arranged between the insert and the cover and forms the pump membrane proper as well as an outlet valve. Normally, in the rest condition of the pump, a magnetic drive member urges a pressure element against the pump membrane and against the inlet valve membrane contrary to the force of a spring. In operation, the spring opens the inlet valve thereby also actuating the pump membrane for its suction stroke. The magnetic drive member returns the pump membrane and the inlet valve back into the rest position thereby actuating the pump membrane for its pressure stroke while closing the inlet valve.

REFERENCES:
patent: 2847149 (1958-08-01), Ainsworth
patent: 2981197 (1961-04-01), Dolza
patent: 3145659 (1964-08-01), Suendsen
patent: 4121584 (1978-10-01), Turner
patent: 4140118 (1979-02-01), Jassawalla
patent: 4142523 (1979-03-01), Stegeman
patent: 4177808 (1979-12-01), Malbec

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