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SECTION 3 PRINCIPLES OF OPERATION

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3-1

SECTION 3

3 PRINCIPLES OF OPERATION

INTRODUCTION

This section includes:

• How the BIS VISTA Monitoring System works

• The architecture of the BIS VISTA monitor and BISx

• System Features

3.1 How the BIS VISTA Monitoring System

Works

The BIS VISTA Monitoring System consists of:

• The BIS monitor with built-in battery backup and detachable power cord

• The BISx

• Aspect’s Patient Interface Cable (PIC) and BIS sensor.

A sensor placed on the patient’s head transmits EEG signals to the BISx. The BISx filters

the data, analyzes it for artifact and processes it using digital signal processing techniques,

then sends the data to the monitor for display. The purpose of processing the EEG

waveform data is to extract characteristic features from the complex signal in order to

provide easier pattern recognition of changes over time during the recording.

3.2 System Architecture

Hardware is divided into three main components: the monitor, the BISx, and the Patient

Interface Cable (PIC) with BIS sensor. The BISx contains the circuits that acquire and

digitize the EEG signals, digitally process the EEG data, and compute the processed

parameters. The BIS VISTA monitor contains the circuits to display the waveforms and

processed parameters. The PIC and BIS sensor are the patient connection for EEG signal

acquisition.

A block diagram depicting the monitor subassemblies appears in Figure 5. A data flow

diagram appears in Figure 6.

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Aspect BIS VISTA Spécifications Page 23