21
early detection of technical faults which could endanger the patient and place the success of the anaesthesia in jeopardy.
Performing PNS with the Stimuplex® HNS 11 and the Stimuplex® or Contiplex® needles
1.Check the Stimuplex® HNS 11.
2.Check the skin electrode (ECG adhesive electrode) (the conduc- tive gel must not have dried) and apply it to a degreased area of skin which is not in the distribution area of the nerve to be blocked.
3.Carry out patient positioning, skin disinfection, and if neces- sary, local infiltration of the needle puncture site.
4.Connect the electrode cables to the stimulation needle (nega- tive) and skin electrode (positive), switch on the Stimuplex® HNS
11 and set the mA controller current (mA 
) to zero.
After the automatic
Caution! A change to the stored parameters can only be made when the LEDs are lit. By pressing any button the LEDs will light up and indicate the value stored. To change press the appropriate button.
5.Select pulse width (0.1 ms, 0.3 ms or 1.0 ms).
6.Select pulse frequency (1 Hz or 2 Hz).
7.Select amplitude range (1 mA max or 5 mA max.).
8.Advance the Stimuplex® or Contiplex® needle through the skin and the subcutaneous tissue towards the nerve to be blocked.
Set a current of approx. 0.30 mA (set value mA 
) - the orange LED above the display flashes in time with the stimulation, the display shows a ~ next to the ▲ and a tick signals that current is flowing in the tissue.
Then switch to actual current flowing value indicator (mA
) and check that the actual value corresponds to the set value (see p. 12 - Technical data, measuring tolerance).