The characteristics of vibrotactile stimulation and an experimental device for the transmission of rhythm information contained in music and similar sounds by means of vibrotactile stimulation are described. The actuator and input/output behavior of the device are examined. Measurement of the intensity discrimination threshold and beat frequency perception threshold is discussed. Application to music education in schools for the deaf is described, and results of a clinical test are reported.

In Japan, the manufacture and sale of medical electrical equipment requires the permission and license of the Ministry of Health and Welfare. Electrical safety tests must be conducted at an official institution. This paper presents the statistical results of a series of 404 safety tests of medical devices, reports the electrical safety problems encountered, and suggests electrical design considerations for safety.

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Two types of new equipotential connecting devices have been developed for the medical electrical equipment. The features of each type include lower contact resistance, firm connection between socket and pin and a high level of safety. The results of testing a third type of connector (developed earlier) are included. They have individual features which users can select according to their particular purposes of use. The new devices will contribute to improved safety of the medical electrical equipment.