Patent ID: 8920748

Claim:
A biochip with a piezoelectric element for ultrasonic standing wave generation, comprising an upper module, a lower module and a chemical sensor; the upper module having a carrier, a photoresist layer, a flow inlet, a flow outlet, an opening of a reaction chamber, a piezoelectric element, an O-ring and multiple spacers, said photoresist layer formed on one of two surfaces of said carrier; the flow inlet, the flow outlet and the opening of the reaction chamber formed through the photoresist layer and the carrier; the piezoelectric element set on a surface of the photoresist layer; the O-ring set on the other surface of said carrier surrounding the opening of the reaction chamber and the spacers set on the other surface of the carrier near edges; the lower module having a carrier, an O-ring and multiple spacers, the carrier, the O-ring and the spacers of the lower module set corresponding to the carrier, the O-ring and the spacers of the upper module, respectively; and the chemical sensor mounted between the O-ring of the lower module and the O-ring of the upper module, attaching the upper module and the lower module such that the chemical sensor encloses the opening of the reaction chamber, wherein said photoresist layer is an epoxy-based negative coating with a viscosity of 51500 cSt, and a thickness of from 100 μm to 2 mm.