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High Precision Mixing of Anesthetic Gases Based on a New Principle
Author(s) -
Lundsgaard J. S.,
EinerJensen N.,
Juhl B.
Publication year - 1977
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/j.1399-6576.1977.tb01223.x
Subject(s) - medicine , mixing (physics) , anesthetic , anesthesia , quantum mechanics , physics
A machine has been constructed for mixing O 2 and N 2 O. It consists of: (a) a proportional pressure and thereby flow regulator at the inlets for O 2 and N 2 O; (b) a digital gas mixer which determines the gas mixture; and (c) a rotameter to measure the outlet flow. The contents of mixtures obtained from the machine were measured with a quadropole mass spectrometer (at 2 and 5 1 min ‐1 with downstream pressures of 500 and 3000 Pa). The mean numeric difference between desired and registered vol% O 2 varied between 0.3 and 0.5 vol% at the four conditions tested. The maximal deviation was 1.2 vol%. Five conventional machines in daily use at the hospital were also tested. The mean numeric difference for these machines varied between 1.1 and 2.7 vol% O 2 . The maximum deviation was 7.4 vol%.