Set / Supplied Current; Disconnection Alarm; Safety" Button; Precision" Feature - VYGON PLEXYGON Manual De Usuario

2.7.3 Set / supplied current

The stimulator provides continuous and automatic check and adjustment of the
supplied current to the selected one . The visualized current is then the selected
one but also the supplied one, apart from the first four seconds from the
variation of the selected current. (see par. 2.5).
In case of peaks of resistance preventing the stimulator from actually supplying
the selected current, the visualized figure will blink* and will be the real one
supplied .
If the needle has not been introduced into the patient yet, after four seconds
the figure on the display will turn to zero (supplied current) and start blinking,
but without any sound alarm .

2.7.4 Disconnection alarm

In case of disconnection from the needle or the ECG electrode, the displayed
current turns to zero and blinks, and the stimulator generate a continuous tone .

2.7.5 "Safety" button

At any moment it's always possible to turn the current / charge immediately to
zero by pressing the "Safety" button .
The pressure of the "Safety" button, further than turning to zero the supplied
current, activates also a protection circuit turning the high tension generator
circuit off and short circuits the output of the stimulator; to re-activate all
circuits, the knob must be turned clockwise .
Pressing only the "Safety" button keeps all other set parameters unchanged .

2.7.6 "Precision" feature

The search for the nerve does not require an absolute precision . Therefore the
stimulator qualifies higher variation steps (0,1 mA) for the adjustment of the
current / charge (see par. 2.4) in order to avoid that too much turns of the knob
are required for obtaining starting current values .
On the contrary, the fine adjustment of the needle tip position requires
reduced values of the charge / current . Therefore the stimulator automatically
qualifies a fine regulation (steps of 0,02 mA) if the current is set lower than 0,5
mA (or equivalent charge, as per table 1 par. 2.4).
When the "Precision" feature is activated, the letter P is shown on the display .

2.7.7 Exhausted battery

On the upper left part of the display, the battery indicator will illuminate and
blink if the battery charge starts to be insufficient to grant the proper
functioning of the stimulator .
However when the low battery indicator lights when the on button is activated,
the device can still operate for at least two hours of continuous utilization .
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