| abstract |
A blood pump, particularly intended as an extracorporeal blood pump, comprises a pump cylinder (1) and two discs (2, 3) spaced apart in the longitudinal direction of the cylinder and substantially filling the cross-sectional area of the cylinder. The discs are reciprocatingly movable in accordance with a preferably variable movement pattern. Each of the discs is provided with a non-return valve means (10, 12; 11, 13) permitting fluid flow through the discs substantially solely in the desired direction of fluid transportation. The discs (2, 3) may be movable relative to the stationary pump cylinder (1) surrounding the discs, or they may be firmly connected with the surrounding cylinder wall, which therewith accompanies the discs in their movements, the cylinder section between the discs having in this case a length which varies in response to the variation of the distance between the discs, and a correspondingly variable volume. |