Wireless Control of Powered Wheelchairs with Tongue Motion Using Tongue Drive Assistive Technology
ABSTRACT Tongue Drive system (TDS) is a tongue-operated unobtrusive wireless assistive technology, which can potentially provide people with severe disabilities with effective computer access and environment control. It translates users' intentions into control commands by detecting and classifying their voluntary tongue motion utilizing a small permanent magnet, secured on the tongue, and an array of magnetic sensors mounted on a headset outside the mouth or an orthodontic brace inside. We have developed customized interface circuitry and implemented four control strategies to drive a powered wheelchair (PWC) using an external TDS prototype. The system has been evaluated by five able-bodied human subjects. The results showed that all subjects could easily operate the PWC using their tongue movements, and different control strategies worked better depending on the users' familiarity with the TDS.
SourceAvailable from: ewh.ieee.org
[Show abstract] [Hide abstract]
ABSTRACT: One of the most important problems for patients with severe disability is the control systems for electric wheelchairs, because they cannot use common systems as the joystick or keypads. This paper proposes the development of a magnetic control system (MCS) to handle a power wheelchair as an alternative control system for patients with spinal cord injuries, as quadriplegics. The proposed system uses the movements of the patient's tongue to operate the power wheelchair, and also includes the development of new communication protocols for the wheelchair through a microcontroller, bridge H and magnetic control.Electronics, Communications and Computing (CONIELECOMP), 2013 International Conference on; 01/2013
[Show abstract] [Hide abstract]
ABSTRACT: To investigate the influence of tongue-disability, age and gender on motor performance for a tongue training paradigm involving playing a computer game using the Tongue Drive System (TDS). Two controlled observational studies. A neurorehabilitation center and a dental school. In Study 1, eleven tongue-disabled patients with symptoms of dysphagia and dysarthria and 11 age-and sex-matched controls participated in tongue training. In Study 2, 16 healthy elderly and 16 healthy young participants volunteered. In study 1 and study 2, the tongue training lasted 30 min and 40 min respectively. The participants were instructed to play a computer game with the tongue using TDS. Motor performance was compared between groups in both studies. Correlation analyses were performed between age and relative improvement in performance. Subject-based reports of motivation, fun, pain and fatigue evaluated on 0-10 numerical rating scales (NRS) were compared between groups. In study 1, tongue-disabled patients performed poorer than healthy controls (P=0.005) and with a trend of a gender difference (P=0.046). In study 2, healthy young participants performed better than healthy elderly (P<0.001) but there was no effect of gender (P=0.140). There was a significant negative correlation between age and relative improvement in performance (δ=-0.450, P=0.009). There were no significant differences in subject-based reports of motivation, fun, pain and fatigue between groups in any of the studies (P>0.094). The present study provided evidence that tongue-disability and age can influence behavioral measures of tongue motor performance. TDS may be a new adjunctive neurorehabilitation regime in treating tongue-disabled patients.Archives of physical medicine and rehabilitation 08/2013; DOI:10.1016/j.apmr.2013.08.008 · 2.18 Impact Factor