Patent ID: 9321051
Filing Date: 2016-04-26
CPC Classification: B01L,F16K

Claim Text:
1. A microfluidic device comprising: a first substrate including a micro-flow path and a valve seat protruding into the micro-flow path, the first substrate being formed of a hydrophobic material; a second substrate coupled to the first substrate and including a cavity aligned with the valve seat; a valve gate film provided between the first substrate and the second substrate, such that the valve gate film opens and closes the micro-flow path with air pressure applied to the cavity, the valve gate film being formed of a hydrophobic material; and a first hydrophilic coating disposed on an entire surface of the hydrophobic first substrate, a portion of the first hydrophilic coating being disposed on a surface of the valve seat facing the hydrophobic valve gate film such that the surface of the valve seat is not attached to the valve gate film, wherein a height of the valve seat is less than a depth of the micro-flow path such that the portion of the first hydrophilic coating disposed on the surface of the valve seat is separated from the valve gate film and the micro-flow path is opened when air pressure is not applied to the cavity, and wherein the valve gate film moves to be in contact with the portion of the first hydrophilic coating disposed on the surface of the valve seat and the micro-flow path is closed when air pressure is applied to the cavity.