METHOD FOR ACCURATE AND LOW-CONSUMPTION MEMS MICROPUMP ACTUATION AND DEVICE FOR CARRYING OUT SAID METHOD

摘要

The present invention describes the improvements due to alternated actuation cycles to reduce the delivery errors related to the pumping chamber elasticity, the actuator relaxation or hysteresis. The method actuates a pumping device with an optimal driving voltage profile, wherein the pumping device comprises a pumping chamber including a pumping membrane and a voltage controlled actuator connected to said membrane; the movement of said membrane being defined by three positions, namely a rest, a bottom and a top position. The method includes the actuation of the membrane with a pumping pattern including at least two different cycles: Cycle A: rest-bottom-rest-top-rest Cycle B: rest-top-rest-bottom-rest. The invention also relates to a device to carry out the method.

主权项

1. A method for actuating a pumping device to achieve a determined pumping pattern which improves the accuracy delivery, wherein the pumping device comprises:
a pumping chamber including a pumping membrane and an actuator connected to said membrane which is pushed to generate a positive pressure in the pumping chamber and is pulled to generate a negative pressure in the pumping chamber, an inlet channel which is connected to a reservoir, an outlet channel which is connected to a patient line, a valve located at the inlet channel which has a fluidic resistance named Rin a valve located at the outlet channel which has a fluidic resistance named Rout wherein said membrane being designed to have at least three positions, namely a rest position, a bottom position and a top position;wherein the rest position is comprised between the bottom and the top positions, and wherein said top, rest and bottom positions correspond a minimum, an intermediate and a maximum volume of the pumping chamber respectively,wherein the pumping pattern comprises a number of stop to the rest position preceded by a partial push named Stpush and a number of stop to the rest position preceded by a partial pull named Stpull;said method being characterized by a pumping pattern including a ratio Stpush/Stpull which depends of the ratio Rin/Rout.