getemed VitaGuard VG2100, Руководство по эксплуатации

Страница: 105 / 124

Algorithms and measuring principles 105
10 Algorithms and measuring principles
Knowledge of the following calculation bases is essential if VitaGuard®
is to be properly configured.
10.1 Alarm condition and report delays
As prescribed in the standard IEC 60601-1-8 “General requirements
for safety – Collateral standard: General requirements, tests and
guidance for alarm systems in medical electrical equipment and
medical electrical systems”, this section allows the doctor to become
familiar with the set and inherent delays for the correct configura-
tion of the alarm limits and monitoring parameters.
The alarm condition delay is the time from the occurrence of a
triggering event on the patient or in the monitor to the decision
by the alarm system to confirm an alarm condition.
The alarm report delay is the time between when an alarm condi-
tion is detected and when it is reported.
The alarm condition delay and the alarm report delay are added to
yield the ALARM SYSTEM delay.
The algorithms listed here are based on worst credible cases, i.e. the
calculations always return the maximum possible delays.
10.1.1 Alarm condition delay for the heart rate
The current heart rate used for detecting alarm conditions is calcu-
lated as the average value over a set number of heartbeats (two to
sixteen).