Design and Development of Weighted Decision-Tree Regulating Care-Bed with Bedsore Protection and Viscera Signal Analysis

• Main Authors: Guan-YuChen, 陳冠宇
• Other Authors: Yiing-Yuh Lin
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/84611795668535676963

碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 98 === The bedsore problem is common in long-term bedridden patients which can be caused by body weight that leads to skin necrosis when staying on the same lying position over excessive period of time. Through feedback control method, the objective of this study is to design and develop an automated care-bed and proposes a bed-plates angle sequence for preventing or help healing bedsore while increases comfort for the bedridden patients. The model bed developed in this research is formed by six interconnected and movable bed plates. It also includes a pressure measurement module with six sensors for taking particular location of body pressure on every bed plate, a pulse measurement module for monitoring heart beat and viscera signals, power drive and transmission module for adjusting bed-plates angle, and a data processing and control module for performing FFT processing and weighted decision-tree regulation. Unlike the open-loop controlled ones that currently can be acquired from the market, the proposed care-bed adjusts the bed-plates angle according to the pressure and the duration of time measured on the plates. It also considers the heart beat and the associated viscera frequencies for any unusual or abnormal condition, which may be the sign of discomfort or sickness of the patient, and calls to the care takers’ attention. Special sequence of bed-plates angle can be set to reduce the load over the body position with bedsore. A comfort index is formulated to quantify and assess the patient’s feeling. Several experiments have been performed on the proposed care-bed with a proportioned human dummy and the results indicate that better care with higher comfort index than the existing ones can be achieved.