Philips Efficia DFM100 - SOM PCA; Therapy PCA

B: Theory of Operation Assemblies Descriptions
190
• Control of pacing functions on the Therapy PCA, including:
– Monitoring pacing current delivered.
– Controlling enabling of pacing and pacing isolation relays.
• All ECG processing including filtering, beat detection, and rhythm analysis.
• Interconnection site for ECG leads cable, and SpO
2
PCA.
• ECG analog front end for ECG from 3- and 5-lead cables.
• Sensing the paddle ID resistor and identifying the type of paddles or pads connected.
• EtCO2 data processing.
•SpO
2
logic and patient isolation.
• Measurement of device temperature.
• Monitoring of overall system health.
SOM PCA
The System-on-Module (SOM) PCA provides the memory and computing power. It is located directly
on the Processor PCA and stores user configuration selections, operating software (including data for
generating display formats and graphics), alarm limits, etc.
It performs the following functions:
• Processing power
• Random Access Memory (RAM)
• Program Flash Memory
• Database Flash Memory
•USB Interface
•Audio Signals
Therapy PCA
If the Processor PCA is the “brain” of the device, the Therapy PCA is “senses” and “muscle”. It consists of
three major sections: The Power circuit, the Therapy circuit, and the Pads ECG circuit. It performs the
following functions, as directed by the Processor PCA:
• Charges and keeps the capacitor charged to the correct energy level.
• Delivers defibrillator shocks and controls the waveform.
• Disarms the Capacitor and controls the disarmed energy absorption into Internal Resistors.
• Generates pacing waveforms.
• Charges the battery.
• Provides analog front end for ECG from the pads/paddles.
• Measures impedance for the Patient Contact Indicator (PCI) function.
• Monitors the overall system power, including detecting the battery or the presence of external power.
• Control of the RFU indicator (the RFU signal is sent through the Processor PCA).