抄録
We have developed cuffless blood pressure monitoring system to prevent sudden death while driving. This system monitors driver's blood pressure only by gripping a steering wheel. The system measures ECG of the driver through metal electrodes installed on both sides of the steering wheel, and measures pulse wave from an optical sensor built in the steering wheel. We use a 525 nanometer green light-emitting diode which reduces surface reflection from human body and enhances the signal-to-noise ratio of the pulse wave. We extracted cardiovascular-related features by analyzing the pulse wave as well as calculating pulse transit time from ECG and the pulse wave. Then we estimated blood pressure using these features as explanatory variables. We modeled blood pressure estimation by multiple linear regression analysis using 1008 subjects' data composed of blood pressure measured by automatic sphygmomanometer, ECG, and pulse wave in a laboratory. Then we verified the accuracy of the model using our steering wheel sensor system, which indicates that the system has a potential to estimate blood pressure precisely only with a few problems.
