Micropump having a constant output

Details Micropump having a constant output Micropump having a constant output

A - Human Necessities

61

M

310/2, 128/80

A61M 5/142 (2006.01) F04B 43/04 (2006.01)

Patent

CA 2014235

ABSTRACT A micropump comprising a pumping chamber, an inlet channel communicating with the pumping chamber by an inlet valve and an outlet channel communicating with the pumping chamber via an outlet valve, these elements being manufactured by etching a silicon wafer which is then sealed to glass wafers, the micropump also comprising a piezoelectric wafer to vary the volume of the pumping chamber by bending a wall forming part of the wall of this pumping chamber. In accordance with the invention the pumping chamber has a stop which determines the amplitude of movement of the flexible wall. The variation in the volume of the chamber caused by the displacement of the flexible wall is precisely defined, thus making it possible to maintain the output of the micropump constant during normal operating conditions. Figure 7A

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