Anaes · Vaporisers

Vaporisers

Also known as Vaporiser · Plenum vaporiser · Variable-bypass · Draw-over vaporiser · Desflurane vaporiser · Temperature compensation

The vaporiser vaporises the liquid volatile anaesthetic agent and adds a precise concentration to the fresh gas flow. The framework rests on four exam-critical ideas: the variable-bypass plenum vaporiser, where the dial sets the splitting ratio between chamber and bypass flow (Dhulkhed 2013; Abel 1996); the temperature compensation by bimetallic strip and bellows as vaporisation cools the liquid and its saturated vapour pressure falls (Dhulkhed 2013); the desflurane exception — its remarkably high vapour pressure means it is not a variable-bypass system but an electrically heated, pressurised, dual-circuit blender (Miller 1994; Andrews 1993); and the safety systems of agent-specific calibration, keyed fillers and the single-vaporiser interlock (Abel 1996; Dhulkhed 2013). Checked per the AAGBI guidelines (2012) and the machine-check assessment (Tiviraj 2016), with low-flow conservation per the closed-circuit review (Parthasarathy 2013).