Patent ID: 7005078

Claim:
A method of manufacturing a fluid-flow device, the method comprising the following steps: providing a stack ( 30 ) comprising a support wafer ( 36 ), one layer of insulating material ( 34 ) covering directly at least part of said support wafer ( 36 ), and one layer of single-crystal or polycrystalline silicon ( 32 ); covering directly said layer of insulating material ( 34 ) and presenting a free face; providing at least one closure wafer ( 20 ); using photolithography and chemical etching to machine a cavity ( 38 ) from said closure wafer ( 20 ) and/or from the free face of said silicon layer ( 32 ); using photolithography and chemical etching to machine at least one duct ( 102 ) passing right through said support wafer ( 36 ); chemically etching said layer of insulating material ( 34 ) at least via said duct ( 102 ) such that a zone ( 35 ) of said silicon layer ( 32 ) is freed from said layer of insulating material ( 34 ), thereby forming a moving member ( 40 ) in said silicon layer ( 32 ), said moving member ( 40 ) remaining connected to the silicon layer ( 32 ) and facing said freed zone ( 35 ); using a physicochemical method to connect said closure wafer ( 20 ) in leaktight manner directly to said free face of silicon layer ( 32 ) thereby said moving member ( 40 ) facing said cavity ( 38 ).