Patent ID: 7311503

Claim:
A micropump comprising: a Silicon On Insulator stack covered in a closure wafer, said stack comprising: a support wafer, a layer of insulating material covering at least part of said support wafer, and a layer of single-crystal or polycrystalline silicon covering said layer of insulating material and covered by said closure wafer; said layer of insulating material connecting said support wafer to said silicon layer; said closure wafer and/or said silicon layer being machined so as to define a cavity between said closure wafer and said silicon layer, the cavity being for filling with liquid and including a pump chamber; said support wafer comprising at least a first duct passing right through it and situated in register with said cavity; said layer of insulating material having at least one first zone that is entirely free of material placed at least in line with said first duct so as to co-operate with said cavity to define a first moving member in said silicon layer, the first moving member being suitable, due to its elasticity and under pressure of liquid in said pump chamber, for moving reversibly towards said support wafer, said first moving member forming part of the flap of a liquid inlet control member; and said micropump further comprising a pumping portion comprising control means fitted with a pump diaphragm to cause the volume of the pump chamber to vary periodically, and liquid outlet control means.