Datascope - Mindray
Datascope - Mindray
Datascope - Mindray
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Theory of Operation Components<br />
37. Bellows Assembly<br />
The AS3000 employs ascending ventilation bellows, in which mixed gas is stored. Drive<br />
gas supplied by the ventilator forces the bellows to descend sending mixed gas into the<br />
inspiratory passage of patient's airway. If a patient's airway suffers from gas leakage, the<br />
bellows will collapse, informing the operator of a possible problem. A tidal volume scale is<br />
provided on the transparent dome, through which a patient's tidal volume can be estimated.<br />
38. Pressure-relief Valve<br />
The Pressure-relief Valve is located at the base of the bellows. When end-expiration airway<br />
pressure reaches 1 - 3 cmH2O, the pressure-relief valve opens and redundant gas is<br />
expelled.<br />
39. Exhaust Gas Outlet<br />
The Exhaust Gas Outlet is located on the lower part of the Breathing System. It is connected<br />
to the AGSS or via the AGSS transfer tube.<br />
40. Absorber Heating System<br />
The Breathing System is heated to body temperature to avoid humidified gases condensing<br />
within the Breathing System thus improving airway climatization for the patient's re-breathing<br />
of respiratory gases.<br />
1.3.5 Breathing System<br />
The Breathing System is integrated into a compact aluminum block. This block is heated to<br />
body temperature to prevent condensing of humidified gases within the Breathing System,<br />
thus improving airway climatization for the patient's re-breathing of respiratory gases. The<br />
heated Breathing System contains: an inspiratory valve with O2 adapter for FiO2 measurement, expiratory valve, APL Valve, breathing bag connection, and internal<br />
inspiratory and expiratory flow sensors.<br />
1.3.6 The Ventilator Unit<br />
The AS3000 ventilator offers multiple ventilation modes: Controlled Mandatory Ventilation<br />
with volume control (CMV), Pressure Control Ventilation (PCV), Synchronized Intermittent<br />
Mandatory Ventilation (SIMV), and Pressure Support (PS) ventilation. Electronic PEEP is<br />
available in all ventilation modes. User control over inspiratory flow (SLOPE) is possible in<br />
PCV, SIMV, and PS modes. Automatic fresh gas compensation limits the effect of user<br />
changes in fresh gas flow rate on the patient. The traditional bellows system is driven by<br />
oxygen and makes patient disconnections clearly visible.<br />
AS3000 Service Manual 0070-10-0683 1 - 9
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