Most of the inhalational anesthetic agents in use today are liquids at atmospheric pressure and room temperature and must be converted into vapors before they can be used. A vaporizer (anesthetic agent or vapor delivery device) is a device that changes a liquid anesthetic agent into its vapor and adds a controlled amount of that vapor to the fresh gas flow or the breathing system. Up to three vaporizers are commonly attached to an anesthesia machine.
A small question before we move further
Which Inhalational Agent you use most commonly
- Isoflurane (51%, 22 Votes)
- Sevoflurane (28%, 12 Votes)
- Halothane (14%, 6 Votes)
- Desflurane (5%, 2 Votes)
- I don't have vaporizers at my setup (2%, 1 Votes)
Total Voters: 43
ASTM Anesthesia workstation standard for Vaporizers
- The effects of variations in ambient temperature and pressure, tilting, back pressure, and input flow rate and gas mixture composition on vaporizer performance must be stated in the accompanying documents.
- The average delivered concentration from the vaporizer shall not deviate from the set value by more than ±20% or ±5% of the maximum setting, whichever is greater, without back pressure.
- The average delivered concentration from the vaporizer shall not deviate from the set value by more than +30% or -20% or by more than +7.5% or -5% of the maximum setting, whichever is greater, with pressure fluctuations at the common gas outlet of 2 kPa with a total gas flow of 2 L/minute or 5 kPa with a total gas flow of 8 L/minute.
- A system that prevents gas from passing through the vaporizing chamber or reservoir of one vaporizer and then through that of another must be provided.
- The output of the vaporizer shall be less than 0.05% in the “OFF” or “zero” position if the “zero” position is also the “OFF” position.
- All vaporizer control knobs must open counterclockwise.
- Either the maximum and minimum filling levels or the actual usable volume and capacity shall be displayed.
- The vaporizer must be designed so that it cannot be overfilled when in the normal operating position.
- Vaporizers unsuitable for use in the breathing system must have noninterchangeable proprietary or 23-mm fittings. Conical fittings of 15 mm and 22 mm cannot be used. When 23-mm fittings are used, the inlet of the vaporizer must be male and the outlet female. The direction of gas flow must be marked.
- Vaporizers suitable for use in the breathing system must have standard 22-mm fittings or screw-threaded, weight-bearing fittings with the inlet female and the outlet male. The direction of gas flow must be indicated by arrows and the vaporizer marked “for use in the breathing system.”
Powerpoint Presentations on Anesthesia Vaporizers