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Magnetic Adaptor for the Portex Tracheostomy Tube

because tracheal tubes are made of elastomeric material and consequently their actual internal diameter may not be precisely the same as their nominal diameter. Not only is there a small permitted tolerance ( kO.2 mm for sizes 6.5 and larger) for new tubes, but the variation may be considerable for tubes which have been repeatedly sterilised, particularly if they have been autoclaved with the connector in place. It follows that the ideal situation which he envisages in which the appropriate connector and the tube are both marked with the same number may not invariably be realised in practice and in any case, it will always remain the anaesthetist’s responsibility to check that the connector makes a satisfactory and secure fit in the tube and that there is no clinically significant obstruction to the gas flow through the assembly. In spite of these caveats there is considerable scope for improvement on the lines suggested by Dr Stout and I will be very happy to put his suggestion before the relevant British Standard Committees.