Patent ID: 8580209
Filing Date: 2013-11-12
Classification: B01L,B29C,B29L,F04B,F16K

Abstract:
1. A microfluidic structure, comprising a substrate ( 1 ) with channels ( 5 ) formed in the substrate ( 1 ), and a film ( 2 ) attached flat to the substrate ( 1 ) with unattached portions ( 25 ), so that a chamber ( 6 ) comprising a wall is formed above the substrate plane ( 21 ) in an unattached portion ( 25 ), wherein the film ( 2 ) is a multilayer film, in particular a two-layer film, whereby the film ( 2 ) comprises a sealing layer ( 4 ) arranged on the substrate and a covering layer ( 3 ) arranged above it and whereby the sealing layer ( 4 ) has a lower melting and/or softening temperature than the covering layer ( 3 ) characterized in that at the edge zone between the unattached ( 25 ) and attached portions ( 24 ) a wedge of material ( 11 ) is formed by the viscous flow of the film material as the film ( 2 ) is bonded to the substrate ( 1 ), this wedge of material ( 11 ) forming a transition between the chamber wall and the substrate ( 1 ) and lifting the chamber wall away from the substrate plane ( 21 ) and whereby the chamber ( 6 ) in the film covers one end of a channel section ( 5 ) in the substrate ( 1 ) and whereby the walls of said channel ( 5 ) in the substrate ( 1 ) form a step to the chamber ( 6 ) in the film.