手指の筋肉の機械的収縮活動による片麻痺回復度の定量化

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  • Quantification of Hemiplegia Recovery by the Measurement of Mechanomyogram at Finger Muscles

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<p>There is a need for a mechanism that allows patients with hemiplegia (especially paralysis in upper limbs) to continue rehabilitation at home without assistance by experts. To this end, a rehabilitation device that promote separative movement of fingers has been proposed. The device needs to identify the degree of voluntary control at each finger. To know the degree, the activities of the muscles that control individual fingers should be measured. Conventionally, the force generated by the fingertip was used. However, the force at fingertip is an accumulation of forces generated by multiple muscles. Therefore, it is impossible to detect movement of flexor and extensor muscles at each finger. A paralysis patient at a certain stage exhibits simultaneous contraction of flexor and extensor muscles. In this case, the previous measurement method does not identify the patient at that stage. Electromyogram (EMG) is known as a method of knowing the amount of activity of individual muscles. However, it is difficult to properly attach the sensors to the patient’s body without help by experts. In this study, we propose a new way to measure the activities of flexor and extensor muscles of fingers which uses displacement MMG (Mechanomyogram). MMG is a method of measuring local muscle activity by deformation amount of the skin surface using a simple noncontact optical sensor. By this, it is expected to realize more appropriate quantification of the recovery of paralysis by a sensing device which is easily used at home.</p>

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