The M3S-based electric wheelchair for the people with disabilities in Taiwan.
OBJECTIVE
This study aims to establish an electronic wheelchair system in Taiwan that conforms to multiple master-multiple slave (M3S) standards. The proposed system could enhance the safety and convenience of people with disabilities.


METHODS
The M3S-based head-controlled electric wheelchair consists of three parts: (A) the input device, (B) the output device, and (C) the safety device. Head movement can be used as the input control to cause the tilting device to produce a corresponding level of analog voltage (backward & forward/left & right) which is then transmitted to the analogy/digital conversion module to control the output device (wheelchair's motor). Ten subjects with C5 incompleted spinal cord injury were recruited in the clinical assessment. They were randomly assigned into groups A and B. In the group A, the subjects were assigned to operate the head-controlled wheelchair system with M3S standard before operating the head-controlled wheelchair system without M3S standard. In the group B, the subjects were assigned to operate the head-controlled wheelchair system without M3S standard before operating the head-controlled wheelchair system with M3S standard. Two subjects in the group B drop off due to their personal reasons.


RESULTS
The time cost for group A in completing tasks 1, 2, and 3 with the M3S and without the M3S were insignificant (p>0.05). The time cost for completing in group B was insignificant (p>0.05). Thus, the wheelchair operating time is depended on the proficiency of the subjects, not the M3S standard added.


CONCLUSIONS
The time cost for subjects to operate the wheelchair was determined by their proficiency, not the M3S standard control added to the system. However, the M3S-based system did realize the safety mechanism and complex auxiliary tools with and without the plug-in and play function.
Chen
Weoi-Luen
WL
Department of Electronic Engineering, Hwa Hsia Institute of Technology, Taipei, Taiwan.
Chen
Shih-Ching
SC
Chen
Yu-Luen
YL
Chen
Show-Ho
SH
Hsieh
Jung-Chai
JC
Lai
Jin-Shin
JS
Kuo
Te-Son
TS
D000328:Adult; D006233:Persons with Disabilities / Q000534:rehabilitation*; D004867:Equipment Design; D004869:Equipment Safety; D019416:Head Movements / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D013119:Spinal Cord Injuries / Q000534:rehabilitation*; D013624:Taiwan; D013647:Task Performance and Analysis; D014910:Wheelchairs