Digicare Biomedical Technology
Operators Manual Multi-parameter Patient Monitor " LifeWindow Lite LW8 "
32
SECTION 6 – CO2 MONITORING
A. OVERVIEW
• The LifeWindow™ Lite LW8 Patient Monitor has a plug and play CO2 technology, with Micro-
Flow™ sidestream CO2, MainFlow™ mainstream CO2 and Dual Capnography, designed
with sophisticated infrared absorption spectroscopy.
• The Micro-Flow™ sidestream module can be assembled internally in the unit or it can be one
small and lightweight external module. The sample lines used are the same for both internal
and external Micro-Flow™ sidestream modules.
• The MainFlow™ mainstream sensor is assembled in the air way adapter. The connection of
the MainFlow™ mainstream sensor is the same as the external Micro-Flow™ sidestream CO2
module.
• The Dual Capnography is enabled by the interchangeability of the Micro-Flow™ sidestream
and MainFlow™ mainstream external sensors. The LifeWindow™ Lite LW8 automatically
recognize what type of CO2 external sensor is connected and configures the CO2 function.
• The LifeWindow™ Lite LW8 with internal Micro-Flow™ sidestream module does not have the
connection for the external Micro-Flow™ sidestream and the MainFlow™ mainstream sensor.
SECTION 6.1 – MAINSTREAM CO2 MONITORING
A. Principle of Operation
• The LifeWindow™ Lite LW8 MainFlow™ mainstream CO2 sensor is used for the continuous
measurement of CO2 and respiratory rate. The sensor measures CO2 by using the infrared
absorption technique. The principle is based on the fact that CO2 molecules absorb infrared
(IR) light energy of specific wavelengths, with the amount of energy absorbed being directly
related to the CO2 concentration. When an IR beam is passed through a gas sample
containing CO2, the electronic signal from the photodetector (which measures the remaining
light energy) is measured. This signal is then compared to the energy of the IR source and
adjusted to accurately reflect CO2 concentration in the sample. The MainFlow™ mainstream
CO2 sensor’s response to a known concentration of CO2 is stored at the factory in the
sensor’s memory. A reference channel accounts for optical changes in the sensor, allowing
the system to remain in calibration without user intervention.
• The LifeWindow™ Lite LW8 MainFlow™ mainstream CO2 sensor is designed specifically for
measurement of CO2 using sophisticated infrared absorption spectroscopy. With
mainstream, measurements are taken at the patient’s airway at a sampling frequency of 100
Hz, so response is faster and there is less chance of erroneous, artifact data. The analyzer
portion of the sensor cannot be contaminated with patient secretions, and there are no
pumping or pneumatic components to replace. So, maintenance requirements and overall
cost-of-ownership are minimized. The family of airway adapters are easy to use and durable
enough even for long-term ventilator patients.
B. Indications for Use
• The MainFlow™ mainstream CO2 Sensor is to be used by a physician or licensed health care
professional trained in the use of the equipment.
Содержание LifeWindow Lite LW8
Страница 1: ......
