Patent ID: 6155256
Filing Date: 2000-12-05
Classification: A61M

Abstract:
A fresh gas system for use in an anaesthetic machine, said fresh gas system comprising:at least two gas sources containing respectively different gases;a gas preparation unit connected to said at least two gas sources for preparing a flow of fresh gas comprising a gas mixture of at least said two different gases, said gas mixture having a unique viscosity;a vaporizer in communication with said gas preparation unit, through which said gas mixture is passed, said gas mixture in said vaporizer picking up a quantity of anaesthetic dependent on the viscosity of said gas mixture;means for determining a composition of said gas mixture disposed upstream from said vaporizer and for emitting a signal identifying said composition; andcontrol means, supplied with said signal, for controlling said gas preparation unit for compensating for the composition of the gas mixture for causing a predetermined amount of anaesthetic to be picked up by said gas mixture in said vaporizer independently of the composition of said mixture.