Basic Study of the Muscle Stiffness Measurement by Ultrasonic Vibrator.
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概要
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This paper proposes a new measurement method of the muscle stiffness, which corresponds to the diagnostic semi-quantitative stiffness based on the sensory information of the doctor, by using an ultrasonic vibrator, and describes basic characteristics of the measurement system. Distinct features of this method are as follows: (1) transcutaneous non-invasive quantitative measurement without pain and disconfort sensation, and (2) easy and less troublesome in operation for rapid measurement. These could be realized by the contact-impedance method which was based upon the fact that electrical impedance change reflected the stiffness of the tissue in the measurement by using an ultrasonic vibrator made of piezoelectric device. It was shown that the impedance locus of the ultrasonic vibrator varied with the stiffness of the object which was made contact with the vibrator tip. Measured values of the equivalent impedance were quantitatively discussed on the basis of the electrical impedance of a simplified electrical equivalent circuit, which corresponded to mechanical impedance of the objective material. The resonace frequency of this device was between 10 and 100kHz. It was considered that the frequencies used in the experiments were suitable for measuring biomechanical impedance of the muscle from the skin surface because there seemed to be no influence of the resonance of the living body structure and no necessity of complicated measuring system. Using the proposed system, the equivalent impedance could be measured easily under the condition that the depressed value of the vibrator tip was kept constant. From the experimental results, it was proved that the electrical equivalent impedance of the objective material had close relation to the stiffness obtained by palpation. Therefore it can be concluded that the obtained electrical equivalent impedance colud be considered as an index of the stiffness of the objective tissue.
- 一般社団法人 日本生体医工学会の論文
一般社団法人 日本生体医工学会 | 論文
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