sessantaquattro user manual v1.1 - June 2017
pag. 27
8.7
Patient connection
Regardless of the adapter used and the detection mode, sessantaquattro need to be connected to
the patient with a reference strap or electrode. This is necessary to fix the common mode body
potential of the patient to the midpoint of the sessantaquattro power supply. All the adapter
provide a 2 mm female banana connector for this purpose.
All the signals are recorded from sessantaquattro as monopolar signal with respect to the patient
reference. For this reason, it is important that the patient reference strap or electrode is placed on
a point without activity and possibly close to the electrode for the detection on the biopotential
signals. The bipolar or differential modes are obtained by subtracting the samples, digitalized by
the A/D converter, in the microcontroller firmware.
Sessantaquattro has been designed as a floating device. For this reason, the battery recharge
occurs through the same connector of the electrodes, avoiding the simultaneous connection of the
patient and an external power source.
The same concept has to be respected when connecting external signals to the auxiliary input,
both, for the patient safety and to avoid interferences on the biological signals.
