The Heat is On: Autotherm 390 Portable Diathermy Unit

The Heat is On: Autotherm 390 Portable Diathermy UnitThe Autotherm 390 Portable Diathermy Unit allows doctors to administer therapeutic electrically-induced heat any way they want to in their practice. This product can easily be carried between treatment rooms using its soft rubber capacitive pads. Additionally, it can be mounted to an optional cart to offer a solid platform for an inductive coil drum electrode.


·         2, 4.7 x 7.1 inch soft-rubber plate applicators with flexible cables.

·         6 felt spacers.

·         2 cloth covers.

·         2, 48 inch elastic, Velcro® straps.

·         Input: 100–240 VAC, 50-60Hz.

·         ETL Listed: ME 390 (9801427).

·         Frequency: 27.12 MHz.

·         HF output

-        Continuous mode: 100 W Average Power.

-        Pulsed Mode: 200 W Peak Power.

·         Pulse frequency:  10 Hz, 20 Hz, 50 Hz, 100 Hz, 400 Hz.

·         Pulse duration: 65μs, 100μs, 200μs, 300μs and 400μ s.

·         Treatment time:   1-30 minutes.

·         Operating Temperature: +50°F to +104°F. 

·         Humidity: Operating, 30% to 75% Relative Humidity at 104°F, Non-operating, 5 to 95%, Relative Humidity, non-condensing. 

·         Storage Temperature: -40°F to 167°F.  

·         Storage Humidity: Storage, 30% to 90% Relative Humidity at 104ºF, non-condensing. 

·         Storage Pressure: 700-900 mB.


This portable diathermy unit employs either pulsed or continuous shortwaves for both deep and shallow penetration. All of this combines to provide patients with gentle, warming stimulation of large muscle groups. Like pulsed ultrasound, the patient receives the mechanical effects of diathermy without any thermal properties. The Autotherm 390 weighs only 15 lbs, making it fully portable. The greatest benefit of diathermy is that it treats a larger surface area and provides deeper penetration than other thermal modalities.


Instrument cart, four-joint folding arm, 14 cm diameter coil applicator, and special field coil cable are not included with the standard unit. These items are required for coil applications.


It is recommended that shortwave diathermy be used when a physician needs to offer deep heat to a larger site that would be normally covered by ultrasound.  It is also recommended that the patient removes the clothing around the area to be treated and use a terry cloth towel directly over the skin. The doctor can then place the drum directly over the towel. Diathermy has the potential of being an unattended modality, allowing the physician to see other patients while the treatment is taking place (a pull-cord allows the patient to stop all output if the treatment becomes uncomfortable).

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