. Anaesthetics : their uses and administration. ns principle.) F P Face-piece. E V Expiratory valve (rubber). I V Inspiratory valve (aluminium). A A Air aperture. G I Gas inlet tube to which the Cattlins bag is attached. H Handle set for nitrous oxide. 1 Handle set for air. 2 Handle set for rebreathing into bag-. Gags.—The one figured has special advantages from thefacility it offers for rapid removal and replacement. In itthe screw-fixing arrangement is replaced by a ratchet. By putting the finger upon the free end of the ratchetand pressing it backwards as one does a trigger, theratchet is r
. Anaesthetics : their uses and administration. ns principle.) F P Face-piece. E V Expiratory valve (rubber). I V Inspiratory valve (aluminium). A A Air aperture. G I Gas inlet tube to which the Cattlins bag is attached. H Handle set for nitrous oxide. 1 Handle set for air. 2 Handle set for rebreathing into bag-. Gags.—The one figured has special advantages from thefacility it offers for rapid removal and replacement. In itthe screw-fixing arrangement is replaced by a ratchet. By putting the finger upon the free end of the ratchetand pressing it backwards as one does a trigger, theratchet is released and the gag closes. To open it, it isonly necessary to press the handles together and the 72 ANAESTHETICS. ratchet will automatically gear and prevent closing ofthe mouth. The ratchet arrangement can be used withlong or short handles; personally I prefer , the long handles such powerful leverage is obtainedthat teeth may be easily forced out of their sockets orsnapped off if they are at all brittle. If the jaws of the gag. Fig. 6.—Gag fitted with ratchet arrangement. (Dr. Dudley Buxtons pattern.) (W. B. Ackland) are placed on the same plane, the gag ismore easily introduced but is more liable to slip. Of mouth openers, Heisters, figured below, is the best. Itpossesses enormous power, so it must be used with care. Itsemployment is indicated in cases of severe trismus, partialankylosis, etc. The blades may be inserted either in a gap
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