ULTRASONIC irradiation of the semicircular canals for treatment of vestibular disturbances was first described by Arslan1 in 1953. Although the equipment originally used by Arslan has been superseded by more efficient generators,2-4 the original method of applying the irradiation to the surgically exposed semicircular canal has not been changed. The main developments have been in the design of more suitable applicators and clinical evaluation of the results of the irradiation, which have established that ultrasonic irradiation abolishes vertigo attacks in a large percentage of cases, while preserving hearing in the affected ear. As the surgical procedure is relatively simple and the new generators are reliable and simple to operate, the technique is becoming accepted by many otologists as the choice method of treating vestibular disturbances which do not respond to standard chemotherapy.
The CAL Generator
The CAL ultrasonic generator (Fig 1), designed to overcome the disadvantages of the
KOSSOFF G, KHAN AE. Treatment of Vertigo Using the Ultrasonic Generator. Arch Otolaryngol. 1966;84(2):181–188. doi:10.1001/archotol.1966.00760030183012
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