TIM Mirus MC DES, Дополнительная информация

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3 General description
MIRUS Controller, SW 2.03.02, Additional Information Master (en-GB) 3-5
3.7 Functional description
The MIRUS Controller is an electronic vaporiser that allows the user to administer a defined
concentration of volatile anaesthetic to a patient.
The MIRUS Controller uses a respiratory measurement system, which is integrated in the
patient’s ventilation system via the MIRUS Reflector, to measure the patient’s breathing activity
and volumes. Based on these measured volumes and the desired concentrations, the MIRUS
Controller calculates the amount of anaesthetic gas that needs to be added to the patient’s
respiratory gas.
Through use of the DOGA function (DOGA = Diffusion-Optimised Gas Application) of the
MIRUS System, the anaesthetic gas is only delivered during the diffusion-relevant phase of
inspiration. No anaesthetic gas is administered during expiration.
The MIRUS Reflector includes a storage unit that holds a certain portion of the exhaled
anaesthetic gas during expiration, and feeds a certain portion of this stored anaesthetic gas
back to the inhalation gas during inspiration (reflection). This effect is comparable to the
conservation of heat and humidity in a Heat and Moisture Exchanger (HME).
The reflection effect depends on the ventilation pattern, the type of volatile anaesthetic and the
concentration level. Because of these parameters, the consumption of anaesthetic gas is not
constant but varies depending on the application. The MAC Pilot function of the MIRUS
Controller evens out different reflection values and changes in the ventilation pattern in such
a way that the concentration of volatile anaesthetic in the patient conforms to the set target
value (target value control).
The MIRUS Controller is equipped with a gas monitor that is directly connected to the MIRUS
Reflector and measures the patient’s gas concentrations (etVA and etCO
2
). These
measurements are displayed on the screen. If they are outside the alarm thresholds set by the
user, the user is informed accordingly through the alarm system. The gas extracted at the
MIRUS Reflector for the gas monitor is fed back to the respiratory system through the MIRUS
Reflector (leakage-free measurement).
The MIRUS Controller is equipped with an internal emergency power supply (UPS battery).
Thus a power loss during VA administration can be bridged with limited functionality for a
defined time period (see Chapter 8.2). This emergency power supply is automatically activated
if the mains power supply fails. All pre-set alarms and parameters are retained during
emergency power operation. A battery symbol on the display informs the user of the
emergency power operation. The battery for the emergency power supply is monitored and
the MIRUS Controller provides a timely alarm notification when the charge level of the battery
is low. The emergency power supply battery is automatically charged as soon as the MIRUS
Controller is reconnected to the mains power supply.