Patent ID: 7988636
Filing Date: 2011-08-02
Classification: A61B

Abstract:
1. A non-invasive electronic apparatus for measuring blood pressure, which comprises a cuff, a gas pump connected with the cuff, a first pressure sensor connected with the cuff, a second pressure sensor connected with the cuff for overpressure and overtime protection, a first solenoid valve unit for deflation, a first microprocessor, a second solenoid valve which is connected between the cuff and the first pressure sensor, an independent timing circuit with timing function, and a combined precise amplification circuit including a voltage follower, a preamplifier, and an output amplifier, wherein an output terminal of the timing circuit outputs an overtime signal to an overpressure and overtime control circuit for overpressure and overtime protection while an input terminal thereof is connected with the first microprocessor for actuating the independent timing circuit, wherein the voltage follower has an input terminal connected with an output terminal of the second pressure sensor, the preamplifier has an input terminal connected with an output terminal of the voltage follower and an input terminal connected with the output terminal of the second pressure sensor, and the output amplifier has an input terminal connected with an output terminal of the preamplifier and an input terminal connected with a reference voltage signal, the output amplifier being configured to output an overpressure signal to an input terminal of the overpressure and overtime control circuit.