BS ISO 11195:1995 Gas mixers for medical use. Stand-alone gas mixers
Withdrawn
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This International Standard gives requirements for the performance and safety of stand-alone gas mixers intended for medical use and intended for connection to a medical gas supply system. Rationales for some of the requirements are given in annex B.
This International Standard does not apply to
a) blocks of flowmeters with separate controls for the flow of each gas;
b) gas mixers which mix oxygen with ambient air;
c) gas mixers which depend on other medical devices for functions required by this standard.
This International Standard specifies basic requirements for stand-alone gas mixers intended for medical use. A known hazard associated with the use of gas mixers is the reverse flow of gas from one gas inlet to another, resulting in the contamination of one gas supply system with another gas and the delivery of an incorrect gas mixture that can cause patient injury. As a consequence of this hazard, particular attention has been paid in this International Standard to minimizing reverse flow. It is recognized that innovations in design may appear which offer performance advantages and yet may conflict with specific design aspects of this International Standard. Such innovations are not to be discouraged. If techniques and technologies advance beyond those in current usage, they should nevertheless meet the safety and performance requirements given in this International Standard. If these techniques and technologies differ significantly from those specified, this International Standard may be amended or revised to encompass them.
