Abstract
In this article, the author aimed to design a lower limb orthosis for the person whose lower limb can emerge the normal electromyography. According to the motion intention method, use the electromyography signal and upper limb angle as the trigger signals of motion. The lower limb electromyography signal is processed by linear envelope method, and the signals are sent to the controller. The system uses PI current feedback control to give the wearer's knee appropriate aids. This orthosis is an exoskeleton with four flat EC motors as the actuators mounted on the outer of the wearer's both knees and hips, besides, uses a battery as the power source. While motor rotating, motor sends the torque to the wearer, therefore, the wearer can reduce forces applied while sitting or standing, and reach the aid purpose.
Highlights
As the technology grows rapidly, the development of orthosis draws more attention to people
The word “orthosis” is raised from Greek word “orthos.” According to International Society for Prosthetics and Orthotics, the definition of orthosis is “externally applied device used to modify the structural and functional characteristics of the neuro muscular and skeletal systems; externally applied device used to compensate for impairments of the neuromuscular and skeletal systems.”
Some patients are suffering from the diseases which lead that lower limb muscles are not strong enough to support the daily motion
Summary
As the technology grows rapidly, the development of orthosis draws more attention to people. Orthosis is for patients to fixed joints or supporting, but for normal people to strengthen force and improve the quality of life. Use EMG signals to be the accordance of supporting force. Nicholas Yang designed an orthosis that equipped spring on legs, which people could transfer the body weight to ground through spring while running or jumping. BLEEX [3] is a lower extremity exoskeleton which is designed by University of Berkeley. It is made for the soldiers and workers in order to carry heavier and more loadings. The previous orthosis in our laboratory is designed by Hsu [7] and improved by Tseng [5] It is designed for those who suffered from Degenerative arthritis. The supporting force is based on the EMG signal of rectus femoris
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