176 Instructions for use Isolette 8000 plus SW 5.n
Principles of operation
The incubator air temperature is monitored by a temperature sensor located in the
sensor module and compared with the air set temperature. The information from
this temperature probe is supplied to the heater control circuitry, which regulates the
heater output to maintain the air temperature setting. The actual air temperature is
shown in the Temperature window. A second thermistor within the air temperature
sensor serves as a backup to limit the maximum incubator temperature. If the high
temperature limit is reached, the heater shuts off.
The infant temperature is a function of the air temperature and the ability of the
infant to establish and maintain its temperature. A small infant, or one with
underdeveloped homeostatic control, may not be able to maintain a stable
temperature at the desired level.
16.2.2.2 Skin temperature mode
In skin temperature mode, the Up Arrow and Down Arrow keys on the front panel
of the controller are used to set the skin temperature at 34.0 °C (93.2 °F) to 37.0 °C
(98.6 °F). In temperature override mode, the temperature can be selected at
37.0 °C (98.6 °F) to 38.0 °C (100.4 °F).
A skin temperature probe is attached directly to the skin of the infant. The
information from the probe is supplied to the heater control circuitry, which
proportions the heater output to maintain the skin set temperature.
The air temperature is still shown in skin temperature mode, but for information
purposes only. If the air temperature mode is selected while the skin temperature
probe remains connected, the skin temperature parameter continues to display the
actual skin temperature. However, it does not control the incubator temperature.
The sensor module is equipped to accept 2 skin temperature probes. To control the
incubator temperature in the skin temperature mode, insert a skin probe into the
central skin probe connector (see Sensor Module on page 31). When an additional
peripheral skin temperature probe is connected, the controller displays the
respective central skin temperature and peripheral skin temperature monitored by
the skin temperature probes.
If the central skin temperature probe is disconnected from its receptacle while in the
skin temperature mode, the skin temperature parameter is invalidated and shows
dashes on the display, an acoustic alarm activates, and the heater turns off.
16.2.2.3 Kangaroo mode
Kangaroo mode simplifies the operation of the incubator when the infant is removed
from the incubator to have direct skin contact with a parent. In this mode, the patient
is warmed by the parent’s body heat instead of the incubator. This mode provides
the user with extended monitoring functions to detect infant hyperthermia or
hypothermia, even when the infant is outside the patient compartment.
Since the infant is no longer inside the incubator during "kangarooing", the infant
skin temperature should no longer be used for controlling the air temperature inside
the incubator. Instead, the incubator should be set up so that when "kangarooing" is
concluded and the infant is returned to the incubator, the incubator is heated to the
same temperature, and climate as when the infant was taken out of the incubator.
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