Heyer Modular+, Руководство по обслуживанию

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Repair Information
2 Theory of Operation
The anesthesia system HEYER represents a flexible employable workstation to apply
and monitor anesthesia inhalation in semi-closed and almost closed circuits in low flow techniques for
minimized consumption of gas and anesthetics.
The basic model includes the following components:
2.1 Microprocessor-Controlled Ventilator
The Microprocessor-controlled ventilator allows with its dedicated patient module time-controlled,
pressure limited, and a constant volume controlled ventilation for all patient groups of a body weight of
3 kg upwards.
The system compliance of the patient module and respiratory tubes are automatically compensated by
the ventilator. Low tidal volumes, therefore, can be dosed very accurately.
Thanks to the different ventilation modes, a ventilation is feasible, even in case of complicated lung
conditions.
A comprehensive test and alarm management system prevents uncontrollable operating conditions
and therefore provides the patient a high safety standard.
The ergonomically designed control surface allows an easy operation of the ventilator. The display
informs about the selected ventilation parameters and the measured values for volume, pressure, FiO
2
and shows real time curves of the expiratory flow and airway pressure.
2.2 Patient Module
The patient circuit is integrated in a compact aluminum block. This block is brought to a moderate
temperature to avoid the formation of water vapor. In additional, it includes a controlled emergency
valve, a reservoir in form of a manual respiratory bag and an expiratory flow sensor.
The patient module is automatically connected to the basic unit through a motor drive. A threaded
shaft pulls the block toward the basic unit, and all connections to the docking block are checked in the
compliance- and leak tests.
2.3 Gas Conditioning Unit
The flow meter block features all the necessary safety facilities, such as O
2
pressure loss alarm and
N
2
O shut-off. An integrated pneumatically controlled system provides a minimum of 25% oxygen
concentration in the fresh gas flow at all flow settings (ratio system).
2.4 The Ventilator Unit
The microprocessor-controlled ventilator allows time-controlled, volume-constant and pressure-limited
(CMV) or pressure targeted (PCV) artificial respiration without assisted or synchronized control
functions.
The system also allows manual respiration as well as spontaneous respiration of the patient.
Adjustable PEEP, breathing time ratios (I:E) and pressure sustaining plateau functions are available.
Volume-constant respiration is effected by the time control of the respirator and the fresh gas
decoupling of the patient module. The ventilator computes the inspiratory flow required for the settings
tidal volume (V
T
), respiratory rate and the ventilation time ratio (I:E). The resultant tidal volume (V
T
) is
delivered to the patient at high accuracy
2.5 Adjustable Alarms
Minimum and maximum alarm limit settings are available for Peak Pressure, Mean Pressure and FiO
2
minimum alarm settings are available for tidal volume and minute volume.