Ambulation Dynamic Postural Stability Assessment, System Identification and Design of a lying-Sitting-Standing Anti-gravity Adaptation Rehabilitation Training Modality

Autor: Chi-Chao Chen, 陳繼超
Rok vydání: 2000
Druh dokumentu: 學位論文 ; thesis
Popis: 88
Orthopedics patients who undergo the clinical procedure of artificial hip/knee joint replacement tend to suffer limited motoring control skills in their lower limbs due to unhealed, open wound. As a result, physicians often recommend patients who underwent surgery to utilize walker as aid in walking training that helps to balance the weight load to both feet in motion, in order to speed up improving the lower limbs'' motoring function. Nevertheless, there is a dire need in establishing a comprehensive set of tools and methods by which quantitative evaluation can be given to study the patients'' walking status, footstep weight load balance in terms of how patients can be clinically evaluated for the need to prescribe walking aid treatment or when it is safe enough for them to move freely without the aid of a walker. In lieu of such, the study begins its first segment by incorporating the footstep pressure measuring system developed by Dr. Lee Ming-yi in collaboration with Chang Gung Medical Center, where experiments, analyses and comparisons are made to evaluate the weight load balance between the two feet in walking motion among normal test subjects versus those that underwent artificial hip/knee joint replacement. Findings concluded including the butterfly curve on weight balance and the five balance indicators can be offered as new tools for clinical physicians and therapist in evaluating their patients'' posture control graphs as well as quantitative analysis. In the mean time, part two of the study focuses on the findings concluded from the interactive clinical observation of walking balance derived from part 1, by which an Output Error Model is established and used for establishing an interactive footstep balance identification system on how human walk, followed by further data analysis. The system input concerns the differential weight load between the left and right foot, and the output concerns the distance of wobble between the center points of their footsteps as they walk, in which minimum square roots are taken for estimating the human feet load balancing system''s transfer functions, as well as the human feet load balancing system''s extreme key points, impedance ratios, natural frequency free of impedance, normalized impedance rating''s. The human balance system''s identification model concluded is expected to bring forth an unprecedented, systemic system identification model and analytical model for processing clinical lab data on orthopedics patients. Part three of the study focuses on how the clinical weight distribution of the incline bed which provides only two options of an upright or fully inclined mode. This has not only proven ineffective in terms of assisting the patients to overcome dizziness which may impede the results of training as they are moved from horizontal to upright position, but also for the lack of quantitative measure on the real-time data on their feet load, preventing the weight adaptation treatment from being fully realized. In lieu of which the study has turned to mechanical design which includes an electronic cylinder drive, incremental dial, coupled with PLC control technique, in a unique design that allows the development of a weight adaptation training equipment featuring convertible horizontal and upright position. The main attraction of the system offers a three incremental adjustments from lying down to sitting and then standing position in a gradual weight adaptation training, coupled with a physiological feedback system for real-time weight load on the two feet, allowing the physicians and therapists a quantitative measure to the rehabilitation program of weight adaptation training among other clinical treatments.
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