Instructions for use Isolette 8000 plus SW 5.n 175
Principles of operation
16 Principles of operation
16.1 Introduction
The Isolette 8000 plus incubator is a modular controller-based incubator that
enables simultaneous control of temperature, oxygen (optional), and humidity
(optional) parameters affecting the infant. Standard features include oval hand ports
with a quiet hand port latch on the front and rear access panels, either oval hand
ports or iris ports on the side hood panels, rails for attaching accessories, and a
Trendelenburg bed-tilt mechanism (0° to 12°). The hood and shell assembly is
mounted on a variable height adjustable (height adjustment) trolley with anti-static
castor wheels. Information is displayed on a liquid crystal display.
Optional components and accessories include a weighing system, a cylinder holder
for D or E size gas cylinders, drawers, utility shelf, and IV pole.
16.2 Functional description
16.2.1 Air circulation system
The Isolette 8000 plus incubator uses a forced air circulation system to warm the
infant. A controlled amount of room air, approximately 7 liters per minute (L/min), is
drawn through the air inlet filter by the motor-driven impeller located in the shell.
The impeller internally recirculates air at a much greater flow than a fresh gas
inflow. The total inflow of fresh and recirculated air is directed around the heater.
The air enters the patient compartment through the slots at the front and rear of the
upper cover. It forms 2 streams, one passing between the inner and outer walls of
the front access panel, and the other between the inner and outer walls of the rear
access panel. The air circulates past the sensor module containing the temperature
sensing probe, which encapsulates the air temperature control thermistor and a
high air temperature alarm thermistor. After circulating within the patient
compartment, the air is then recirculated down through a slot in the right end of the
upper cover, and back to the impeller. When the front and/or rear access panels of
the hood are open, the air continues to flow upward past the opening, creating a
warm air curtain. This curtain minimizes the drop in air temperature within the
incubator.
16.2.2 Temperature regulation
Temperature is regulated by using either incubator air temperature or infant skin
temperature. The front panel keys enable the user to select the desired mode.
In any mode of operation, the heater output is proportional to the amount of heat
required to maintain the desired temperature.
16.2.2.1 Air temperature mode
In air temperature mode, the air temperature can be maintained at 20.0 °C (68.0 °F)
to 37.0 °C (98.6 °F). Temperatures are selected by the Up Arrow and Down Arrow
keys on the front panel of the controller. In temperature override mode, the
temperature can be maintained at 37.0 °C (98.6 °F) to 39.0 °C (102.2 °F).
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