Author/Editor		Karčnik, T; Kralj, A; Munih, M
Title		Ultrasound distance-velocity measurement incorporated into FES rehabilitative system
Type		članek
Source		In: 4th Vienna international workshop on functional electrostimulation: basics, technology, clinical application: proceedings. Baden/Vienna: University of Vienna, Department of biomedical engineering and physics,
Publication year		1992
Volume		str. 48-51
Language		eng
Abstract		Continuous monitoring and evaluation of patient's gait is advantageous for efficient adaptive rehabilitation. The paper is discussing the principles and results obtained by using a simple ultrasound US distance-velocity measuring system being suitable to be included into the gait traming functional electrical stimulator. The system needs to meet specific requirements such as low power consumption and robustness. Unlike other ultrasonic rangemeters, our system does not use the echo principle what improves its dynamic properties and expands its range of activity. It consists of two distinct units. The first one is mounted on patient's stimulator, while the second is standalone unit positioned in a fuced place at the start of a walkway. Distance is calculated from the time difference occurring between US and light passage when covering the same distance. The results achieved with a prototype model indicate 24 Hz sampling rate, 3 per cent accuracy in a 12 m range. Results are satisfactory and overall capabilities of the instrument are satisfactory and within expected limits. Several main sources of errors are pointed out and discussed for highlighting possible improvements.
Descriptors		GAIT SPINAL CORD INJURIES ULTRASONICS ORTHOTIC DEVICES ELECTRIC STIMULATION