Patent ID: 8241891

Claim:
A micro valve apparatus comprising: an upper substrate; an intermediate substrate; a lower substrate; channels as flow paths of a fluid, the channels formed between the upper and lower substrates; a rotatable disk having a rotation axis; a valve hole which interconnects the channels, the valve hole formed in the intermediate substrate in a direction parallel to the rotation axis; chambers for storing a variety of assay buffer and for chemical reactions; the chambers formed between the upper and lower substrates; a thin cylindrical magnet placed on the valve hole, wherein the thin cylindrical magnet is moved upward or downward in a direction parallel to the rotation axis, to open and close the valve hole, thereby controlling fluid flow; an upper electro magnet mounted on the top surface of the rotatable disk, the upper magnet exerts a magnetic force to move the thin cylindrical magnet upward; and a lower electro magnet placed under the rotatable disk, the lower magnet exerts a magnetic force on the thin cylindrical magnet to move the thin cylindrical magnet downward, wherein the upper substrate has a confining groove which holds the thin cylindrical magnet and prevents it from moving away when the rotatable disk rotates.