Diaphragm type blood pump for medical use

Pumps – Expansible chamber type – Distributor formed from integral portion of flexible wall...

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Details

128DIG12, 137855, 604153, F04B 4302, A61M 500

Patent

active

044116039

ABSTRACT:
A positive displacement pump for delivery of blood, or the like, from patients to an extracorporeal circuit, for purification, as in hemodialysis treatments. The pump is small, and sufficiently inexpensive to be discarded after one use. The pump comprises a single blood chamber attached to inlet and outlet conduits separated from the chamber and each other by low resistance flapper valves. The flapper valves are integral with a flexible diaphragm which forms one side of the blood chamber and are operative to close the outlet valve and to open the inlet valve to fill the blood cavity responsive to withdrawal of the diaphragm from the blood chamber cavity and to reverse each valve upon penetration of the diaphragm into the blood chamber to deliver uniformly small increments of blood to an artificial kidney or other blood treatment device.

REFERENCES:
patent: 2378613 (1945-06-01), Young et al.
patent: 3058140 (1962-10-01), Henss
patent: 3145659 (1964-08-01), Svendsen
patent: 3514231 (1970-05-01), Belden
patent: 3610698 (1971-10-01), Gachot
patent: 3802807 (1974-04-01), Kilayko
patent: 4051852 (1977-10-01), Villari

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