Variable Bypass Systems

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Fig. 1: Variable Bypass Vaporizer

30, 42Variable Bypass Vaporizer: Drager  Vaporizer19.1

 

Variable Bypass Vaporizer: Drager  Vaporizer19.1

Drager  Vaporizer19.1

Figure 1

 

30,43Gas flow splitting ratios (20oC)

Desired anesthetic percentage

halothane (Fluothane)

enflurane (Ethrane)

isoflurane (Forane)

sevoflurane (Sevorane, Ultane)

methoxyflurane

1%

46:1

29:1

44:1

25:1

1.7: 1

2%

22:1

14:1

21:1

12:1

0.36:1

3%

14:1

9:1

14:1

7:1

maximum possible = 2.7% at 20oC.

 

Figure below adapted from reference 30 and from Eisenkraft, JB: Vaporizers and vaporization of volatile anesthetics. In Eisenkraft JB, editor, Progress in Anesthesiology, vol 2, San Antonio,1988, Dannemiller Memorial Educational Foundation) (reference 40)

30,40Hypobaric Example

30,40Hyperbaric Example

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