Patent ID: 8648396

Claim:
A microsystem for analyzing blood, comprising: an integrated structure, having a micro reference electrode, a plurality of extended gate field effect transistor (EGFET) elements and a circuit, wherein each extended gate field effect transistor (EGFET) element has a source extension, a drain extension and a gate extension, the gate extensions are disposed at the periphery of the micro reference electrode and essentially separated from the micro reference electrode by a same distance, and the circuit electrically connects the source extensions or the drain extensions; a plurality of ion detecting membranes, disposed on a surface of the gate extensions; a packaging structure, assembled with the integrated structure, wherein the packaging structure has a plurality of first through holes, a plurality of second through holes, a third through hole, a fourth through hole and a fifth through hole, the first through holes corresponding to the ion detecting membranes, the second through holes corresponding to the source extensions or the drain extensions which are not electrically connected by the circuit, the third through hole corresponding to an extension of the source extensions or the drain extensions which is electrically connected by the circuit, and the fourth through hole and the fifth through hole being disposed at a corresponding position above the micro reference electrode; and a conductive material, disposed in the fourth through hole and contacting the micro reference electrode; wherein the micro reference electrode has a reference electrode body and an electrically connecting junction, the electrically connecting junction is formed on the reference electrode body, and the electrically connecting junction corresponds to the fifth through hole.