Patent ID: 7594892
Filing Date: 2009-09-29
Classification: A61B

Abstract:
1. A non-invasive blood pressure measurement apparatus, comprising: a cuff; a main measurement circuit; and a safety protection circuit; wherein said main measurement circuit comprises: a main pressure measurement circuit for collecting a first cuff pressure signal of said cuff; a main microprocessor circuit for receiving said first cuff pressure signal from said main pressure measurement circuit and calculating a pressure value of said cuff; an air pump; an air pump control circuit for receiving a first control signal from said main microprocessor circuit for controlling operation of said air pump based on said first cuff pressure signal; a deflation valve; and a deflation valve control circuit for receiving a second control signal from said main microprocessor circuit for controlling operation of said deflation valve based on said first cuff pressure signal; wherein said safety protection circuit comprises: an assist pressure measurement circuit for collecting a second cuff pressure signal of said cuff in real-time; and an assist microprocessor circuit for outputting a third control signal to said deflation valve control circuit depending on said second cuff pressure signal received from said assist pressure measurement circuit, and controlling operation of said deflation valve via said deflation valve control circuit based on said second cuff pressure signal; wherein said deflation valve comprises a slow deflation valve and a fast deflation valve, and said deflation valve control circuit comprises a slow deflation valve control circuit connected to said slow deflation valve and a fast deflation valve control circuit connected to said fast deflation valve; and wherein said main microprocessor circuit and said assist microprocessor circuit each comprise a respective fast deflation valve control signal output connected to an input of said fast deflation valve control circuit, wherein the open of said fast deflation valve is controlled by said main microprocessor circuit or said assist microprocessor circuit independently, while the close of said fast deflation valve needs said main microprocessor circuit and said assist microprocessor circuit outputting a close signal simultaneously; wherein said main microprocessor circuit comprises a first microprocessor; and wherein said assist microprocessor circuit comprises a second microprocessor that is independent of said first microprocessor such that said assist microprocessor circuit outputs said third control signal to said deflation valve control circuit regardless of whether or not the first microprocessor is dead, running out of control, or fails to respond.