OM265EN issue 16
6
Introduction
The Megapulse 265 is a continuous and pulsed shortwave therapy
unit.
Shortwave therapy can be applied to a wide range of conditions with
successful outcomes. These include acute and subacute traumatic
and inflammatory conditions, chronic rheumatoid and arthritic
conditions, resolution of haematomas and for pain relief.
Shortwave refers to electromagnetic radiation in the frequency range
2 to 100 MHz. Shortwave therapy is the application of
electromagnetic energy to the body at shortwave frequencies. At
these frequencies the electromagnetic energy is converted to
thermal energy by the induction of circulating currents in the tissue
and dielectric absorption in insulating tissue. Shortwave therapy units
may produce output power levels of up to 500W providing significant
heating to the area of the body being treated. For this reason the
treatment is often called shortwave diathermy (through heating). To
avoid equipment such as shortwave therapy units interfering with
radio communications, certain frequency ranges are designated by
international agreement as ISM (Industrial, Scientific and Medical)
bands. These are shown in the following table:-
Centre Frequency
Frequency Range
Maximum
6.78 6.765-6.795 Under Consideration
13.560 13.553-13.567 Unrestricted
27.120 26.957-27.283 Unrestricted
40.680 40.66-40.70 Unrestricted
433.92 433.05-434.79 Under Consideration
915 902-928 Unrestricted
2450 2400-2500 Unrestricted
5800 5725-5875 Unrestricted
24125 24000-24250 Unrestricted
61250 61000-61500 Under Consideration
122500 122000-123000 Under Consideration
245000 244000-246000 Under Consideration
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