Structural units that define fluidic functions
A microfluidic device that comprises several microchannel structures in which there are an inlet port, an outlet port and therebetween a substructure comprising a fluidic function. The device has an axis of symmetry around which the microchannel structures are arranged as two or more concentric annular zones. for an inlet port and an outlet port of the same microchannel structure the inlet port is typically closer to the axis of symmetry than the outlet port. Each microchannel structure comprises a substructure that can retain liquid while the disc is spun around the axis and/or the inlet ports are positioned separate from the paths waste liquid leaving open waste outlet ports will follow across the surface of the disc when it is spun. For the microchannel structures of an annular zones the corresponding substructures are at essentially at the same radial distance while corresponding substructures in microchannel structures of different annular zones are at different radial distances. The invention also refers to several other substructures. The substructure are primarily adapted for transporting liquid aliquots that have a surface tnsion >5 mN/m with centrifugal force.
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.
2. The microfluidic device of claim 1 , wherein said inlet ports and waste outlet ports are on different sides of the device.
3. The microfluidic device of claim 1 , wherein the microchannel structures within an annular zone are divided into groups with the microchannel structures of a group being connected to each other via a common inlet microconduit or a common waste microconduit.
4. The microfluidic device of claim 1 , wherein the waste outlet ports are located at the periphery of the device.