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pulls back, it will draw in some of the gas mixture and then deliver it to the subject. Since
the bag is very compliant, it will not pressurize the system.
2)
Use a flow-past circuit, which involves putting a T-piece on the intake (refill) port as shown
in Figure 2-3. You will have to supply your own T-piece as every gas anaesthesia machine
has different sized tubing. The T-piece’s single port will be attached to the intake valve
tubing. The anaesthetic gas mixture will then be flowing past the intake valve, and not
directly pressurizing the port. Every time the piston pulls back, it will draw in some of the
gas mixture and then deliver it to the subject. Extra gas can be re-circulated to the
anaesthesia machine or sent to exhaust (e.g. fume hood).
FIGURE 2-3: GAS ANAESTHESIA INTEGRATION
Do not pressurize the air/gas intake or exhaust.
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