Patent ID: 7429354
Filing Date: 2008-09-30
Classification: B01J,B01L,G01N

Abstract:
1. A microfluidic device that comprises a microchannel structure in which there are one or more inlet ports, one or more structural units downstream of one of the inlet ports, and one or more outlet ports, wherein the microfluidic device comprises a plurality of individual microchannel structures which are (i) present in a substrate having a spinning axis; and (ii) arranged to define two or more annular zones or sectors thereof around the spinning axis, each of said microchannel structure has a substructure which is downstream of the inlet port and which is capable of retaining liquid when the substrate is spun, and each of said annular zones or sectors thereof has microchannel structures in which corresponding substructures are present at the same radial distance from the spinning axis while corresponding substructures of other zones are present at other radial distances from the spinning axis, wherein at least one outlet port is a waste outlet port and wherein there are no open waste outlet ports at a shorter radial distance from the spinning axis than the inlet ports.