Patent ID: 11944412
Assignee: MICROJET TECHNOLOGY CO., LTD.
Field: Medical technology (Instruments)
Classification: CPC A  B  G | IPC A  B

Claim 1:
2. The blood pressure detection device according to claim 1, wherein the microelectromechanical element comprises:
an oxidation layer formed and stacked on the microelectromechanical-element region of the substrate by a deposition process, wherein the oxidation layer comprises a plurality of convergence channels and a convergence chamber formed by an etching process, and the plurality of convergence channels are in fluid communication between the convergence chamber and the at least one inlet aperture of the substrate;
a vibration layer formed and stacked on the oxidation layer by a deposition process, and comprising:
a metal layer formed and stacked on the oxidation layer by a deposition process and comprising a through hole, a vibration portion and a fixed portion formed by an etching process, wherein the through hole is formed at a center of the metal layer, the vibration portion is disposed around a peripheral region of the through hole, and the fixed portion is disposed at a peripheral region of the metal layer;
a second oxidation layer formed and stacked on the metal layer by a deposition process, and comprising a hollow aperture formed by an etching process; and
a silicon chip layer formed and stacked on the second oxidation layer by a deposition process and comprising an actuating portion, an outer peripheral portion, a plurality of connecting portions and a plurality of fluid channels formed by an etching process, wherein the actuating portion is disposed at a central part of the silicon chip layer, the outer peripheral portion is disposed around an outer periphery of the actuating portion, the plurality of connecting portions are connected between the actuating portion and the outer peripheral portion, respectively, and each of the plurality of fluid channels is disposed between the actuating portion and the outer peripheral portion and located between two of the plurality of connecting portions, wherein a compression chamber is defined by a combination of the silicon chip layer and the hollow aperture of the second oxidation layer; and
a piezoelectric component formed and stacked on the actuating portion of the silicon chip layer by a deposition process, wherein the piezoelectric component comprises a lower electrode layer, a piezoelectric layer, an insulation layer and an upper electrode layer, wherein the piezoelectric layer is formed and stacked on the lower electrode layer by a deposition process, the insulation layer is formed and stacked on a partial surface of the piezoelectric layer and a partial surface of the lower electrode layer by a deposition process, and the upper electrode layer is formed and stacked on the insulation layer and a remaining surface of the piezoelectric layer without the insulation layer disposed thereon by a deposition process, so as to electrically connect with piezoelectric layer.