On February 19, 1929 a medical diathermy machine was developed for use in Schenectady, NY. This machine was aided by the development of vacuum tube machines allowed frequencies to be increased to 10 - 300 MHz, called "shortwave" diathermy. The energy was applied to the body with inductive coils of wire or capacitive plates insulated from the body, which reduced the risk of burns.
These machines continue to be used for muscle relaxation, and to induce deep heating in tissue for therapeutic purposes in medicine. It is used in physical therapy to deliver moderate heat directly to pathologic lesions in the deeper tissues of the body.
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