Patent ID: 7736050

Claim:
A fluid mixing device which produces a series of solutions with different concentrations of a sample solution and a diluent, the fluid mixing device comprising: a plurality of first channels disposed parallel to each other on an upper portion of a layer, and into which an equal amount of diluent flows from its upstream, wherein the plurality of first channels are separated from each other; a plurality of second channels formed perpendicular to the first channels on an upper portion of an adjacent layer to the layer on which the first channels are formed, and into which an equal amount of sample solution flows from its upstream, wherein the plurality of second channels are separated from each other; and via holes formed at at least one intersection between each of the first channel and a plurality of second channels so that a predetermined amount of sample solution flows from the second channels into corresponding first channels, wherein a number of via holes in one of the first channels is different from a number of via holes in adjacent first channels, or wherein the number of via holes in adjacent first channels is the same, and a total area of the via holes in one of the adjacent first channels is different than a total area of the via holes in another of the adjacent first channels, such that the series of solutions with different concentrations is produced in the first channels depending on the amount of sample solution that flows into the first channels through the via holes.