Cuff-less blood pressure meter system
Noordin Aminurrashid · 2009
Most of blood pressure (BP) measuring devices nowadays rely on a common concept of inflatable cuff to the arm which applied auscultotary or oscillometry principle. By having a cuff, the efficiency of the device will be reduced in terms power consumption, restriction of frequency and also ease of use. Therefore this project is aimed at designing a noninvasive cuff-less blood pressure estimation system based on pulse transit time (PTT) technique. Based on previous work of others, the photo-plethysmographic (PPG) circuit is designed to be interface to personal computer utilize PIC l 6f877 A as data acquisition system and Bluetooth as communication interface. The algorithm to measure PTT from R of generated electrocardiogram (ECG) to base point of PPG waveform was developed using Visual Basic 6 (VB6) which this programming also used to develop the graphical user interfaces (GUI) to display the estimated SBP and DBP by offline and online process. The results have shown that the PTT measurement between ECG and PPG of pulse oximeter have a great potential for blood pressure estimation.