Patient Breathing Systems; Scavenging - Datex-Ohmeda Anesthesia Delivery Unit S/5 Technical Reference Manual

Datex-Ohmeda ADU

Patient Breathing Systems

Refer to the technical information tables for the Compact Block patient circuit and the standard
patient circuit with absorber.
Any breathing circuit compatible with a 22/15 mm coaxial fresh gas outlet may be used. A patient
circuit used together with tubing and Bellow block must comply with the prEN740 accepted
resistance stipulation. The compliance for the entire breathing circuit must not exceed 7 ml/ cmH
The employed patient circuit must have unidirectional valves for the inspiratory and expiratory lines
as well as a connection for fresh gas when required (Bain type circuits excluded).
Patient circuits with APL valve must not be used for the ADU to avoid the risk for confusion due to
multiple pressure limiting devices.
NOTE: It has been found that carbon monoxide (CO) tends to build up in unused anesthesia units.
Exchange absorbent in a unit that has been idle for more than 48 hours. Also flush the system with O
before use.

Scavenging

Maximum extracted flow
Normal minimum extracted flow
Passive scavenging
Extracted flow with A-SEJ2 ejector
(Active scavenging with optional scavenging
ejector)
6-10
50 l/min
or
40 l/min if silencer (8502504) installed
25 l/min (independent of fresh gas flow)
Rear panel scavenging connector.
Differential pressure 29 cmH
Minimum 25 l/min at a driving pressure of 250 -
800 kPa (2.5 - 8 bar; 36.3-116 PSI)
Driving gas: Air
O.
2
2
O at 25 l/min
2
Document No. 8502852