Apparatus for pumping fluid at a steady flow rate

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/142 (2006.01) A61M 1/10 (2006.01) F04B 43/067 (2006.01) F04B 53/10 (2006.01)

Patent

CA 2272367

An apparatus for pumping fluid at a steady rate. A first drive chamber having a movable outer surface, and a second drive chamber having a movable outer surface are provided. The apparatus further includes a block having a plurality of internal passages including a first passage for receiving the fluid into the block and a second passage for discharging the fluid from the block at the steady rate. The block has first and second internal chambers which are in fluid connection with the first and second passages. The first internal chamber has a first flexible surface for mating with the movable outer surface of the first drive chamber, and the second internal chamber has a second flexible surface for mating with the movable outer surface of the second drive chamber. At least one actuator is provided for applying positive pressure to the first flexible surface while simultaneously applying negative pressure to the second flexible surface and for applying negative pressure to the first flexible surface while simultaneously applying positive pressure to the second flexible surface. The actuator is respectively coupled to the first and second flexible surfaces by the first and second drive chambers.

Dispositif pour pomper un fluide à un débit constant. Le dispositif comporte un premier compartiment d'entraînement à surface externe mobile, et un second compartiment d'entraînement à surface externe mobile. Le dispositif comporte en outre un bloc possédant une pluralité de passages internes, notamment un premier passage pour recevoir le fluide dans le bloc et un second passage pour évacuer le fluide à débit constant. Le bloc comporte un premier et un second compartiment interne qui sont en communication fluidique avec les premier et second passages. Le premier compartiment interne présente une première surface souple qui peut s'accoupler avec la surface externe mobile du premier compartiment d'entraînement, et le second compartiment interne présente une seconde surface souple qui peut s'accoupler à la surface externe mobile du second compartiment d'entraînement. Au moins un dispositif d'actionnement permet d'appliquer une pression positive à la première surface souple et simultanément, une pression négative à la seconde surface souple, et d'appliquer une pression négative à la première surface souple et simultanément une pression positive à la seconde surface souple. Le dispositif d'actionnement est relié respectivement à la première et à la seconde surface souple via le premier et le second compartiment d'entraînement.

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