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In this study, a new blood pressure measuring system was proposed and implemented. An additional small-cuff was placed on the center of a inner cuff to measure morphological signals and new oscillometric ratio. The proposed BP-measuring system is composed of an external cuff, an inner cuff and a small-cuff. Oscillation signal from small-cuff is interpolated with 7th-order fitting polynomials and SBP, DBP ratio were 22.2% and 87.7%. Experimental data were gathered from 20 volunteers ( years) and arterial blood pressure values were compared with auscultation, sphygmomanometers, small-cuff and inner-cuff. As a result, the difference in systolic BP between auscultation and the small-cuff was 1.93() mmHg, and the inner-cuff was 4.53() mmHg, and sphygmomanometer was 6.68() mmHg, and the corresponding difference in diastolic BP was 2.50() mmHg, 3.50() mmHg, 7.35(), respectively.

Design of Noninvasive Arterial Blood Pressure Measurement System by Using Double-Cuffs Oscillometric Method