6. Ultrasound heads (only Guidance C)
The Guidance C can be delivered with 2 different multifrequent ultrasound heads:
Model 891 : 1 cm² 1/3 MHz
Model 892 : 4 cm² 1/3 MHz
(See technical specifications for more details)
The unit has two different ultrasound output connector on which each head can be connected (in every
configuration).
The ultrasound head converts the electric signal into ultrasound using a piezo crystal. This crystal, with
a diameter depending on the desired head size, is glued in an aluminium cup that minimises
electromagnetic radiation and enables the crystal to be used on to operating frequencies.
The aluminium cup can also be used as a second electrode if combination therapy is desired. A separate
electrotherapy device needs to be connected to the safety socket for combination therapy.
An OTP is installed in the treatment head to enable the micro controller to detect whether a head is
connected and to recognise the type of head that is connected. It also contains the calibration values of
the head in question.
The ultrasound head has a visual contact control indication: the treatment heads are fitted with light
of two colours, yellow and green.
The following configurations are possible:
Yellow light continuous indicates
: the treatment head gives US energy
Yellow flashing indicates
: end of treatment
Yellow/green flashing indicates
: there is no contact during treatment.
Green flashing indicates
: just connect the US head, device is reading the OTP data
Green continuous light indicates
: the treatment head is selected
Repairing of Ultrasound heads: technical bulletin.
Phyaction Guidance E/C – service manual version 0.5 Page 24
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