Accuracy Evaluation of Robotic Tonometry Pulse Sensor System Based on Radial Artery Pulse Wave Simulator

Abstract

In this paper, a robotic applanation tonometry pulse sensor system has been developed to easily detect the pulse pressure index (PPI) using a pulse sensor array and reduce the position errors caused by manual operation when measuring the pulsation location of the subject's wrist using a robotic manipulator with automatic localization and pressurization. The amplitude change and shift of the pulse pressure (PP) caused by the unstable measurement angle of the tonometry device with a single sensor were measured and analyzed through an experiment with varying measurement angles. To evaluate the accuracy of the robotic tonometry system, the set PPI of the pulsatile simulator, which repeatedly generates artificial radial artery pulses, was compared with the PPI values estimated by the proposed methods. Accuracy evaluation of the pulse sensor indicates a coefficient of variability for the measured signals of up to 3.2 % and a minimum accuracy of 93.7 %; however, the PP calculated by a curve-fitting method applied to the measured signals from the array sensor was improved to an average of less than a 1.0 % coefficient of variability and 97.9 % accuracy. The developed robotic tonometry system represents a contribution to the radial pulse wave research field, which requires more accurate pulse wave analysis and PP measurements.

A Transfer Function Model Development for Reconstructing Radial Pulse Pressure Waveforms Using Non-Invasively Measured Pulses by a Robotic Tonometry System

“…In order to measure radial pulses without a human operator, this study will use a robotic tonometry pulse measurement system (RTS), which was developed in an earlier study by the authors. While the detailed design and performance of the RTS can be found in the study [ 15 , 16 ], this section intends to briefly recapture the working principle of the system and its key features as background information in the context of the current study. Figure 2 a shows a photo of the RTS, which is a 5-axis motor system, allowing 3-degrees-of-freedom (DOF) linear translational motion and 2-DOF rotational motion.…”

An Intelligent Wristband for Simultaneous Multiparameter Measurement during Fumigation and Washing Therapy of Traditional Chinese Medicine

“…Although many researchers have done much work to this end, and several TCM‐based sensors, such as the diaphragm‐based optical fiber pulse sensor, [ 10 ] the robotic tonometry pulse sensor system, [ 11 ] Bi‐Sensing Pulse Diagnosis Instrument (BSPDI), [ 12 ] and the smartphone‐based sensor system for TCM pulse diagnosis [ 13 ] have recently been reported. The present TCM‐based sensors still need further improvement.…”

“…[ 14 ] Then, most TCM‐based sensors have large volumes and cannot be worn by users, reducing the comfort of use and limiting their application in primary hospitals, especially in family healthcare. Furthermore, many of these reported TCM‐based sensors are data recorders rather than analysts, [11b] which means a lot of physiological data obtained by TCM‐based sensors still need to be analyzed by doctors or other professionals, and the convenience will be significantly reduced. So, it is in desperate need to develop TCM‐based wearable sensors that can realize simultaneous multiparameter measurement and combine artificial intelligence to analyze physiological data.…”