Enraf Nonius 1600905, User Manual

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1600751-4D
10.1.7 Connection and disconnection reactions
Constant Current (CC) output characteristics may cause unpleasant connection and
disconnection reactions if the electrodes are not securely placed or lose contact with the skin.
Make sure the current amplitude is set to 0 mA when you apply or remove the electrodes. Use
the Constant Voltage (CV) output mode with dynamic electrode applications.
10.2 Ultrasound
10.2.1 Contact Control
The ultrasound treatment head has a contact control function that suspends treatment when the
acoustical contact with the body drops below a certain level (see paragraph 14.1). The indicator
light on the treatment head is turned on to signal this situation, the ultrasound amplitude display
will start blinking and the treatment timer will stop counting down. During this situation the
treatment head emits a small amount of energy to sense restoration of acoustical contact. You
may experience this when the treatment head only partially contacts the body. When contact
restoration is sensed the treatment is resumed at the set Amplitude.
The contact control function does not work at Amplitudes below 0.2 W/cm².
10.2.2 The contact medium
To ensure efficient transfer of energy, a contact medium is required between the ultrasound
treatment head and the body. Air causes virtually total reflection of the ultrasound energy. The
best medium for the transfer of ultrasound energy is a gel.
• The gel should be applied to the part of the body to be treated and then spread out with the
ultrasound treatment head.
• Never apply the gel to the ultrasound treatment head. The treatment head will register this as
acoustical contact and may emit ultrasound energy, which could damage the treatment head.
If the body surface is very irregular, making it difficult to obtain good contact between the
ultrasound treatment head and the body, or if direct contact must be avoided (e.g. due to pain),
the affected area may be treated under water (subaqual method). The water should be
degassed (by previous boiling) in order to prevent air bubbles arising on the ultrasound
treatment head and the body.
10.2.3 Before treatment
• Check the patient for contraindications. See section 5.1.1 for details.
• Test the warmth sensibility of the treatment area.
• To optimize ultrasound transmission, clean the skin of the treatment area with soap or a 70%
alcohol solution.
• Strong hair growth has to be shaved.
10.2.4 During treatment
• The ultrasound treatment head has to be moved constantly, also with the semi-static method.
During treatment the displayed ultrasound Amplitude can vary around the set value, caused
by fluctuations in acoustical coupling.
• Ask the patient regularly for his/her findings. If necessary the treatment will have to be
adapted. The Amplitude can be reduced or the continuous mode can be changed to pulsed
mode or vice versa.
• When there are signs that the ultrasound transmission is bad, add more contact gel or
spread it with the ultrasound treatment head.