Aspect BIS VISTA - Principles of Operation; How the BIS VISTA Monitoring System Works; System Architecture

SECTION 3 PRINCIPLES OF OPERATION
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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.