16
5
DESIgN AND FUNCTION
5.2
SAFETy DEVICES
5.2.1
SENSORS
The deltastream heater cooler monitors the following
during operation:
• The water level in the unit
• Whether the water temperature in the circuit corre-
sponds to the set target value
• Whether there is mains voltage
• Whether its own functional safety is in order
and triggers an alarm if there is a fault (see “6.3 Alarms”
on page 21).
5.3
TyPE PLATE
The type plate (here an example) featuring the connec-
tion and output data is located on the back of the unit:
Figure 5:
Typeplate
5.4
FUNCTION
5.4.1
bASICS
The deltastream heater cooler unit are used to heat or
cool the patient’s blood between 15 °C and 39 °C with the
aid of a oxygenator.
The temperature line between the patient’s blood and
the water circuit runs via a membrane in the oxygenator.
Because of its high thermal capacity and good heat-con-
duction properties, water is an ideal transfer medium for
this application.
The water is cooled or heated in a water tank in the unit
using thermo electric elements and, when operated with
a oxygenator, is continuously fed to a rotary pump.
The correct operation of the unit is shown by various indi-
cators on the front of the unit. Its electronic controls can
accurately set the temperature transfer to the patient’s
blood while simultaneously ensuring the unit is operating
safely.
