Sonicator Plus 930 Instruction Manual— Rev.J_09/13/17
47
Intensity Setting ERA Effective Power Produced
(W/cm²) (cm²) (W)
1.5 1 1.5
1.5 5 7.5
1.5 10 15.0
You will note, though the intensity setting remained constant, the amount of energy
delivered varied appreciably. We caution the user to consider this since units of different
manufacture are available in many departments. If watts per square centimeter is used as
the prescribed intensity setting, the effective watts delivered will not remain constant.
7.3 Continuous and Pulsed Waves
Ultrasound may be applied in either continuous or pulsed waveform. Advocates of pulsed
beam applications suggest the approach reduces the thermal effects while accenting the
mechanical. Wulff in his paper titled “Reduction of Thermic Effect of Ultrasound Dosages
by the Use of Pulsed Ultrasound Energy”, reported, “ .... the use of pulsed ultrasound
energy permits accurately controlled reduction of total ultrasound intensities employed in
therapy.” He recommended the use of rectangular pulses and stated, “The biologic
response reactions of the sonated tissue seems to continue during the sound free intervals
provided that a ratio between pulse duration and free interval of 1:4 is maintained.”
Laboratory research being conducted by Dyson and associates in England seems to
indicate beneficial non–thermal effects of ultrasound. However, clinical studies have not
been conducted to thoroughly corroborate this evidence.
The Sonicator Plus 930 provides both continuous and pulse wave capabilities. The
continuous mode is on more than 95% of the time and has an unmodulated wave. The
pulse setting has a pulse frequency of 100 Hz with a pulse width of 2 milliseconds and 8
milliseconds between pulses for the 20% duty cycle. In the puse mode, peak power is
displayed.
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