Patent ID: 7412990
Filing Date: 2008-08-19
Classification: B01F,B01L,B33Y,Y10T

Abstract:
1. A microfluidic control device comprising: a storage chamber for storing fluid flowing from outside; a branching flow channel connected to the storage chamber; a plurality of reaction chambers connected to the branching flow channel; a connecting channel leading from each of the plurality of reaction chambers; a capillary stop valve configured to stop the fluid flowing from all of the connecting channels, the stop valve comprising a confluence chamber and an injection hole; and a collection chamber connected to the confluence chamber, wherein a motive force necessary for moving the fluid is derived from natural capillary phenomenon; wherein a boundary surface of the fluid from each of the connecting channels stopped at the stop valve is disturbed after a droplet is injected at the injection hole, causing the stop valve to lose its function of stopping the flow of fluid from the connecting channels, thereby allowing the fluid to flow through the confluence chamber to the collection chamber; wherein the stop valve is formed of a cross sectional rapid expansion structure so as to increase stop pressure of the stop valve; and wherein the cross sectional rapid expansion structure is shaped to have rapidly expanding channel heights of upper and lower substrates so as to increase an expansion angle in a transporting direction of the fluid.