Algorithms and measuring principles 103
TA
(max)
for bradycardia: ...... set
Bradycardia delay
+ 2 s
TA
(max)
for tachycardia: ...... set
Tachycardia delay
+ 2 s
TA
(max)
for hypoxia: ............. set
Hypoxia alarm delay
+ 2 s
TA
(max)
für hyperoxia: ......... set
Hyperoxia alarm delay
+ 2 s
The purpose of these alarm report delays is to prevent alarms from
being reported every time the alarm limits are violated for short times
only.
In other words, the maximum alarm report delay corresponds to the
maximum set delay. The monitor outputs measurements e.g. to the
display every second. The technology’s contribution to the total alarm
report delay is specified as maximum two seconds overall.
10.3 Measuring principle for the SpO
2
monitor
The pulse oximeter with Masimo SET® (SET =
Signal Extraction Tech-
nology®) is based on the following three principles.
1 Oxyhemoglobin (oxygenated hemoglobin) and deoxyhemoglobin
(unoxygenated hemoglobin) differ in their absorption of red and
infrared light (spectrophotometry).
2 A heartbeat gives rise to a pulse wave that during its cycle
changes the volume of arterial blood and therefore its light ab-
sorption at the monitoring site (plethysmography).
3 In particular movements also give rise to blood flows that resem-
ble pulse waves and generate interference signals.
Like conventional pulse oximeters, SET® oximeters determine oxygen
saturation by directing red and infrared light through tissue and
measuring the absorption of light by the blood flow. Light-emitting
diodes (LEDs) serve as light sources and a photodiode as the receiver
attached opposite.
Summary of Contents for VitaGuard VG310
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Page 108: ...108 Evaluating stored data on a PC Fig 79 VitaWin register Events in graph form...
