04634430 is referenced by 143 patents and cites 7 patents.

Pump arrangement (10) for medical purposes, in particular blood or infusion pump, comprising a pump housing (12) having two pump chambers (16, 18), of which the work chamber (16) is subjected to the liquid to be pumped while the drive chamber (18) is connected via a connecting conduit to a pneumatic pump (14) of restricted pumping volume.

This connecting conduit (50) comprises a valve (56) which is opened at the respective changeover point (top and bottom dead-center) of the pump (14) to set the entire pump arrangement (16) to atmospheric pressure.

Title
Pump arrangement for medical purposes
Application Number
6/709167
Publication Number
4634430
Application Date
March 7, 1985
Publication Date
January 6, 1987
Inventor
Hans Dietrich Polaschegg
Oberursel
DE
Agent
Townsend & Townsend
Assignee
Fresenius
DE
IPC
A61M 37/00
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