. Anaesthetics : their uses and administration. —Mouth prop. (Underwood.) and figured above is also useful. It has a soft pad at eitherextremity (fig. 9). Although spring and mechanical props are objectionableupon the general ground of their liability to get out of order Fig. 10.—Sir F. Hewitts mouth prop. or to break, yet some kinds are useful, and I subjoin illustra-tions of some of the best. Sir F. Hewitts props (fig. 10) are serviceable. They aremade of metal, shaped to fit between the upper and lower 74 ANAESTHETICS. teeth, and have removable india-rubber caps on theirextremities. Except
. Anaesthetics : their uses and administration. —Mouth prop. (Underwood.) and figured above is also useful. It has a soft pad at eitherextremity (fig. 9). Although spring and mechanical props are objectionableupon the general ground of their liability to get out of order Fig. 10.—Sir F. Hewitts mouth prop. or to break, yet some kinds are useful, and I subjoin illustra-tions of some of the best. Sir F. Hewitts props (fig. 10) are serviceable. They aremade of metal, shaped to fit between the upper and lower 74 ANAESTHETICS. teeth, and have removable india-rubber caps on theirextremities. Except in cases in which the wedge has to reston the gum, I think the rubber caps are undesirable, and preferto employ props of the same shape as the one figured madewholly of nickel-plated metal, with the surfaces cupped to holda biting surface of lead. This, although it does not chip,allows the teeth to grip slightly into it. The narrow end ofthe wedge is placed towards the pharynx, and the horizontalsurface should rest on the mandibular Fig. II.—Wallers gag. A central prop, fixing upon the anterior teeth with arotating arm, permits of operations upon one or other side ofthe mouth according to the necessities of the case. A veryconvenient form is figured above (fig. ii). It possessesan easily working screw, which permits of very nice adjust-ment. The plates should rest upon more than one tooth ineach jaw. No mouth prop or cork should be placed in the mouthwithout being first securely tied to a counterpoise whichhangs out of the mouth, and prevents the prop becomingwedged in the larynx or oesophagus in the event of itsslipping. Several sizes are required, and these can be care- NITROUS OXIDE GAS. 75 fully tied together with strong fishing cord ; the chains oftenused are apt to snap. The few minutes spent in carefullyadjusting the prop between the teeth should not be grudged,
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