Tec 6 vaporizer is used with.........

The most common such vaporizer is the Ohmeda Tec 6, designed specifically for use with desflurane. Desflurane has two physical propeies, making it unsuitable for use with a conventional vaporizer. First, it has a very high SVP (88.5 kPa at 20degC). A conventional vaporizer would require high fresh gas flows to dilute it to within clinically useful concentrations, making it uneconomical. Secondly, it has a low boiling point (23.5degC). At room temperature, it will intermittently boil resulting in large fluctuations in agent delivery. When boiling, there will be excessive agent delivery; however, it will then cool due to a large loss of latent heat of vaporization, resulting in an exponential decrease in SVP and under-delivery of agent. The Ohmeda Tec 6 overcomes these problems by using an electrical filament that heats the desflurane to 39degC, raising its SVP to 194 kPa, that is, nearly 2 atm. In addition to providing a stable SVP, this high pressure removes the need for a pressurized carrier gas--instead, the fresh or diluent gas is entirely separate from the vaporizing chamber