Integrated Monitor Theory of Operation 2 Theory of Operation
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Record The Record Service retrieves current and stored physiological
data and status data to format a continuous strip recording. A
recording can be triggered manually by the operator or
automatically by an alarm condition. The Record Service uses the
services of the Recorder Interface to control an M1116B
Recorder in the FMS. The Record Service can also send data to a
central recorder.
Alarm The Alarm Service contains logic that prioritizes alarm conditions
that are generated either by the Measurement Servers, Flexible
Module Server, or by IntelliVue Patient Monitoring System
software modules. Visual alarm signals (messages) are displayed at
the top of the IntelliVue Patient Monitoring System display and
alarm sounds are generated by a loudspeaker. Alarm conditions
may be generated when a physiological parameter exceeds
preselected alarm limits or when a physiological parameter or any
other software module reports an inoperative status (technical
alarm, for example, the ECG leads may have fallen off the
patient). The Alarm service manages the alarm inactivation states,
for example suspension of alarms, silencing of alarms, and alarm
reminder. Alarm signals may also be configured as latching
(alarm signals are issued until they are acknowledged by the
operator, even when the alarm condition is no longer true). The
Alarm service controls the visual alarm signals (alarm lamps).
Trend The Trend service stores the sample values of physiological data
and status data with a resolution of 12 seconds, 1 minute or 5
minutes for a period of up to 48 hours. The data is kept in
battery buffered read/write storage and flash memory devices to
be preserved across power failures. The stored data is protected
via consistency checks and checksums. When a new patient is
admitted, the trend database erases all data of the previous
patient.
HiRes The OxyCRG (Oxygen CardioRespiroGram) service derives a
high-resolution trend graph from the Beat-to-Beat Heart Rate,
SpO
2
or tcpO
2
, and Respiration physiological data. The
OxyCRG is specialized for neonatal applications, allowing the
opeartor to identify sudden drops in Heart Rate (Bradycardia)
and SpO
2
or tcpO
2
(Desaturations), and supporting the operator
in visualizing Apnea situations.
ADT The ADT (Admit/Discharge/Transmit) service maintains the
patient demographics information. The operator may admit a
new patient, discharge the old patient and enter or modify the
patient demographics. The ADT service also supports the
transport of a patient (trend database) with the M3001A Multi-
Measurement Server. The ADT service controls the deletion of
old patient data, the upload of trend data from the M3001A and
the switching back of all settings to user defaults. It also
synchronizes patient information with a central station on the
network.
Functional Block Description
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