Abstract: A three-wheel pedal-style wheelchair which includes a roller at a side, close to the ground, of the wheelchair, wherein the roller prevents the wheelchair from turning over, a steering wheel arranged at a side of the wheelchair, and two front wheels respectively arranged at two opposite sides of the wheelchair, wherein the two front wheels comprises a driving wheel led to rotate forward or backward by a user stepping and a loose wheel, wherein when the wheelchair turns to a direction in a small radius, the steering wheel is considerably rotated to a direction and the driving wheel is rotated forward, wherein when the wheelchair turns to another direction, the steering wheel is considerably rotated to a direction and the driving wheel is rotated backward. Accordingly, the wheelchair is easily controlled to have a small turn, like whirling in one spot, to move and to turn safely.

Abstract: A three-wheel pedal-style wheelchair which includes a roller at a side, close to the ground, of the wheelchair, wherein the roller prevents the wheelchair from turning over, a steering wheel arranged at a side of the wheelchair, and two front wheels respectively arranged at two opposite sides of the wheelchair, wherein the two front wheels comprises a driving wheel led to rotate forward or backward by a user stepping and a loose wheel, wherein when the wheelchair turns to a direction in a small radius, the steering wheel is considerably rotated to a direction and the driving wheel is rotated forward, wherein when the wheelchair turns to another direction, the steering wheel is considerably rotated to a direction and the driving wheel is rotated backward. Accordingly, the wheelchair is easily controlled to have a small turn, like whirling in one spot, to move and to turn safely.

Abstract: The present invention relates to an electrode which is implanted in a living body, and which is used as an electrical stimulation system for the functional training or restoration of paralyzed muscles, and for the measurement of electrical signals of the living body, and the like.The electrode comprises: a core comprising a plurality of infinitesimal stainless steel wires of over 180 kg/mm.sup.2 in tensile strength and under 25 microns in diameter; and a resin coat provided on the surface of the core, made of a resin compatible with the living body. According to one aspect of the invention, the diameter of the electrode is under 0.3 mm; the electrode is provided with a spirally coiled part along its longitudinal direction; the core is stranded in one direction; and the above mentioned coiled part is coiled in the direction opposite to the stranding direction of the core.