Development of a Real-Time Chest Wall Motion Analysis Device

• Main Authors: Zhen-TingWeng, 翁禎廷
• Other Authors: Kuo-Sheng Cheng
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/382ztv

碩士 === 國立成功大學 === 生物醫學工程學系 === 106 === When patients having respiratory related diseases such as acute respiratory distress syndrome (ARDS), lung volume decrease is the major cause for dyspnea. In clinics, the regional chest wall motion is often used for the diagnosis of lung function because it reflects the regional lung volume changes. The purpose of this study is to develop a real-time device for monitoring chest wall motion using the flex sensors, so as to provide the medical personnel a device to observe the continuous changes of lung volume. Multiple sensors are integrated into a belt for placing on the chest and abdominal wall. During the respiration, the proposed system may receive the angle information derived from the impedance change, which is sent from the microprocessor. All the angle information will then be used for reconstructing the contour of chest wall using B-Spline method. In this study, two experiments including the static and dynamic measurements are performed for system evaluation. In static experiment, sensing belt is placed on several known shapes of plates for accuracy and repeatability analysis. In dynamic experiment, three sensing belts are firstly attached on a male subject chest wall. Then, a pneumotachometer is employed for simultaneously measuring the respiratory flow. An algorithm proposed by Konno and Mead is modified for obtaining the best correlation coefficients that relates the cross section change to volume change. From the experimental results, the static measurements show that the accuracy is about 90% with the standard deviation within 3%. In dynamic measurements, the proposed device is demonstrated to be feasible for continuously displaying the chest wall changes during respiration. In summary, this study develops a volume calibration based device for monitoring the regional motion of chest wall.