Implementation of array sensor module for a radial artery tonometry.

In this study, we developed an array sensor module to measure pulse wave of radial artery. To measure pressure, this module contains 7 piezoresistive sensors of the size of 1×1 mm. This sensor module is composed of a PCB for bonding sensor, PCB guide for wiring, silicon guide to keep its shape while PDMS coating, and PDMS layer protect fragile sensor and wire while faithfully transmitting the pressure of the patient's skin to the sensor. To test characteristic of pressure sensors in the sensor module, intra-chamber pressure was raised in 20mmHg step from 60mmHg to 220mmHg. The coefficient of determinant was r(2)>0.999. When the radial artery's pulse wave with developed sensor module was measured, pulse wave is clearly detected. In this study, developed array sensor module is appropriate to measure pulse wave.