Anaesthetic vaporiser

Details Anaesthetic vaporiser Anaesthetic vaporiser

A - Human Necessities

61

M

128/73

A61M 15/00 (2006.01) A61M 16/18 (2006.01)

Patent

CA 1236737

ABSTRACT An anaesthetic vaporiser of the by-pass type in which the concentration of anaesthetic vapour in the gas leaving the vaporiser is controlled by a valve arrangement which is capable of varying the resistance to gas flow of a second or by-pass stream which effectively alters the proportion in which the carrier gas is divided between said second by-pass stream and a first stream which passes through a vaporising chamber. The valve arrangement includes a valve body 32 rotatable within a valve housing 30 having three spaced inlet holes 33, 35, 37 and an outlet hole 40 for the second gas stream. Rotary movement of the valve body 32 variously covers or uncovers the inlet holes 33, 35 and 37 to vary the resistance to the flow of the second stream from the inlet holes to the outlet hole 40 of the housing 30.

462857

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