Patent ID: 6878116
Filing Date: 2005-04-12
Classification: A61B

Abstract:
1. A blood pressure analyzer comprising: an interconnected pressure sensor, a signal processor, and a microprocessor, with said microprocessor also connected to memory and said signal processor comprising a first signal amplifier, a low pass filter, a second signal amplifier, a high pass filter, a voltage clamp, a comparator, a third signal amplifier, an accumulator circuit, and a crystal oscillator such that said pressure sensor registers changes in pressure that are converted by said signal processor into high resolution, digital pulse width modulation (PWM) signal values and said microprocessor controls the saving into said memory of the digital signal values aggregated during the measurement process as well as the calculation of said digital signal values to obtain the average value, high pressure value, and low pressure value of blood pressure, wherein said microprocessor executes the equation below to solve for the respective values Pa, Ph, and P1 of the blood pressure average curve, the high pressure base curve, and the low pressure base curve: Pa=(An+A (n+1))/2, wherein An is the nth point before the average blood pressure value, and A(n+1) is the (n+1) point of the blood pressure value, with the calculation of Pa consisting of first sequentially locating all points before the average blood pressure value and then ascertaining the final point of the average blood pressure value, said value being the value of Pa; taking Pa as a base value, each An point is sequentially integrated once to obtain a respective Kn value and each Kn is compared to Pa, and when a Kn is smaller than Pa, the value of Ph is such that Ph=An; taking Pa as a base value, each An point is sequentially differentiated twice to obtain a respective Km value and each Km is compared to Pa, and when a Km is larger than Pa, the value of P1 is such that P1=An.