Medivance Arctic Sun 2000, Service Manual

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7
CHAPTER 2 THEORY OF OPERATION
2.1 Introduction
The Model 2000 was designed to control patient temperature with a high level of precision by
rapidly altering water temperature in response to a patient core temperature sensor using a
closed-loop algorithm. To achieve rapid response with tight control, the system is designed to
circulate a minimum volume of water, have a high heating and cooling capacity, and include
sensors for real-time feedback of energy transfer.
2.2 System Components
The Model 2000 system is composed of several components.
ƒ
Control Module – The main unit which includes the hydraulics and major elements of the
electronics.
ƒ
Remote Display Module – The primary control and monitoring interface for the user.
ƒ
Fluid Delivery Line – The reusable dual lumen tubing connecting the Control Module to the
pads.
ƒ
Interconnect Cables and Accessories – The cables that connect the Control Module to mains
power, the Control Module to the Remote Display Module, and optional patient temperature
cables. Accessories include fill tubes, drain bags, Fluid Delivery Line straps and others.
2.3 Hydraulic System
The hydraulic system within the Control Module consists of the following major elements:
ƒ Pumps
-
Circulating pump
-
Chiller pump
-
Mixing pump
ƒ Sensors
-
4 Water temperature sensors
-
Flow meter
-
Pressure sensor
ƒ Valves
-
Vent valve
-
Bypass valve
-
Fill valve
ƒ Heater
ƒ Tanks
-
Circulating Tank
-
Chiller Tank
-
Main Tank
ƒ Inlet/Outlet Manifold
ƒ
Chiller