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Abstract
Experiments have been undertaken to construct a device for measurement of the thickness of the otic capsule in order to improve the ultrasonic irradiation technique in the treatment of Menière's disease. Because of absorption of ultrasonic energy within the bone, it has been found necessary to reduce the thickness of the bony labyrinthine wall to considerably less than 1 mm in order to obtain optimum destructive effect upon the labyrinthine epithelium. Up to now, the guiding parameters have been the characteristic structure of the enchondral bone or a translucent canal.
It would be highly desirable to be able to determine the thickness of the bone at a given point down to a few tenths of a millimeter with reasonable accuracy. That this can be done by the application of a new method for reducing the dead time, usually associated with ultrasonic echo instruments, appears reasonably certain. A preliminary model, operated at approximately 4 Mc, has reduced the conventional dead time, corresponding to several centimeters of tissue depth, to one or two millimeters equivalent depth.
Applications for an instrument of the present capabilities within the medical field are numerous.