Patent ID: 8425863

Claim:
A micro fluidic device comprising at least one valve/pump-unit, wherein the micro fluid device comprises: a substrate, wherein on a lower surface of said substrate at least two micro channels are arranged to direct a fluid sample flow on the substrate, whereby said at least two micro channels are disconnected by a valve area on the lower surface of said substrate, wherein the valve area includes a protrusion of the substrate that separates the at least two micro channels, wherein the at least two micro channels and the protrusion are located in a one plane; at least one flexible membrane, wherein the flexible membrane is arranged on the lower surface of said substrate; an actuating element with an upper surface for contacting the flexible membrane; and at least one cover element arranged on a lower surface of the flexible membrane, wherein the cover element comprises at least one through going cut-out for receiving the actuating element, so that movement of said actuating element causes a movement of the flexible membrane to cause or stop a directed fluid flow on said substrate, and so that a fluid flow between said at least two micro channels is directed among the valve area of the lower surface of the substrate and the upper surface of the flexible membrane through a temporarily formable channel formed by the flexible membrane covering the valve area, wherein a movement of the actuating element towards the protrusion of the lower surface of the substrate causes a valve action to stop the fluid flow between the at least two micro channels and a movement opposite to the lower surface of the substrate releases a space in a chamber into which the flexible membrane can engage to form the temporarily channel and the upper surface of the actuating element covers at least partly the membrane surface at valve area, wherein the valve area includes a fluid chamber to store the sample fluid and the sample fluid is dispensed through different micro channels.