[The theory of a low-frequency emitter for ultrasonic therapy]. / K teorii nizkochastotnogo izluchatelia dlia ul'trazvukovoi terapii.

While performing ultrasonic therapy for some soft tissue diseases, a deep tissue ultrasound penetration should be prevented since there may be potential thermal effects on the borderline surfaces (the periostrium, articular menisci, etc.) with greatly varying acoustic properties. For this, a bimorphic low-wave emitter should be used. A emitter-generated pressure-distance relationship has been theoretically derived and experimentally tested. There is an abrupt pressure decline when the emitter is removed from the surface, which recommends that the emitter of this type should be applied to the physiotherapy for diseases needed only near-surface exposure.