Pump

Details Pump Pump

A - Human Necessities

61

M

103/28, 128/81

A61M 1/00 (2006.01) A61M 1/10 (2006.01)

Patent

CA 1286179

ABSTRACT. A blood pump, particularly intended as an extracorporeal blood pump for use in conjunction with surgical pro- cedures, dialysis, oxygenation, etc. comprising a pump cylinder (1), two discs (2, 3) which are spaced apart in the longitudinal direction of the cylinder and which substantially fill the cross-sectional area of the cylinder and are reciprocatingly movable over a given distance . Drive means are provided for dis- placing the two discs (2, 3) backwards and forwards in accordance with a preferably variable, adjustable move- ment pattern. Each of the discs is provided with a respective non-return valve means (10, 12; 11, 13) which permit fluid to flow through the discs substan- tially solely in the desired direction of fluid trans- portation. The discs (2, 3) may be movable relative to the stationary pump cylinder (1) surrounding the discs. Alternatively, the discs (2', 3') may be firmly connect- ed with the surrounding cylinder wall, which therewith accompanies the discs during movement thereof, the cylinder section extending between the discs having a length which can vary in response to changes in the distance between the discs, and a correspondingly vari- able volume. Connected to the inlet end (1a) of the cylinder (1) is a volume equalizing vessel (14), e.g. in the form of a hose-connection having a flexible, flaccid hose-wall which exerts no appreciable pressure on the fluid enclosed by the hose-connection. The outlet end (1b) of the cylinder is connected to a pressure equalizing container (15) of variable volume, e.g. in the form of a hose-connection having a flexible resilient hose-wall which when stretched or dilated exerts a variable pressure on the fluid enclosed in the hose-connection.

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