The Research Of Sleeveless Continuousblood Pressure Measurement System Based On DSP

Blood pressure is one of the key indicators, which reflects the human body's circulatory function. Pressure can be measured to reflect the size, that is, blood pressure measurement. The measurement of blood pressure is the most commonly used in clinic. The accuracy of measuring directly impacts on the observe, judge and the deal of the patients.In this paper, the design of the blood pressure measurement system take the current prevailing low-power single-chip MSP430F149 and DSP chip TMS320VC5416 for two-machine communications. A single machine is mainly responsible for collecting ECG and pulse signal, and bring their own analog signals to digital signals through the 12-bit A / D converter , and then through the DSP's HPI Interface to DSP. DSP is mainly responsible for the acquisition of the signals are processed to calculate blood pressure, and send the final results to the single-chip, and display. In the hardware design, the main line is around the circuit to minimize errors and improve anti-jamming system. In addition to the design of single-chip DSP and the external circuit, in this paper, the design of the difficulties and the focus is on the blood pressure signal conditioning circuit design, this part of the main circuit including the acquisition of ECG, pulse signal acquisition. Because the biggest characteristic of ECG and pulse signals is very weak, vulnerably to external signal interference, such interference, mainly caused by mobile electrode baseline drift (generally less than 1Hz), power-frequency interference (50Hz), EMG Interference (more than a few hundred Hz). This design uses the appropriate methods to minimize the disruption caused by external factors. PWTT can be calculated as well as SBP with the help of the software and with R-ware Peak as the beginning of PWTT and the rise in the rate of 25% as the ending of PWTT, which can remove baseline drift and noise frequency interference mainly through ECG.After the laboratory tests, although the blood pressure measurement system in this article is able to measure the SBP, which meet the practical daily needs in the range of accuracy .But in clinical side, there are still some gaps. Therefore in this article may in the future based on the parameters of further calibrated so as to get more accurate linear relationship, to achieve better results.