Anesthesia . , regulating valve of nitrous oxid;O, regulating valve for oxygen; F, sight feed;S, supports. 172 ANESTHESIA The Gwathmey-Woolsey Mask.—The Gwathmey-Woolsey maskis an anatomical one made to fit the bones of the face. A rubber collar,devised first by Gatch and later nsed by Boothby and Cotton, is retainedas an essential feature of the mask. The adjustment of this collar, to theabsolute exclusion of all air, is considered one of the important featuresof the technique. Ether.—In the small number of cases in which it is necessary to. Fig. 58.—Gwathmey-Woolsey Nitrous Oxid-Oxygen Appar
Anesthesia . , regulating valve of nitrous oxid;O, regulating valve for oxygen; F, sight feed;S, supports. 172 ANESTHESIA The Gwathmey-Woolsey Mask.—The Gwathmey-Woolsey maskis an anatomical one made to fit the bones of the face. A rubber collar,devised first by Gatch and later nsed by Boothby and Cotton, is retainedas an essential feature of the mask. The adjustment of this collar, to theabsolute exclusion of all air, is considered one of the important featuresof the technique. Ether.—In the small number of cases in which it is necessary to. Fig. 58.—Gwathmey-Woolsey Nitrous Oxid-Oxygen Apparatus with CylindersAttached. O, regulating valve for oxygen; O2, oxygen tank; N2O, nitrous-oxid tank. give ether in combination with gas and oxygen it may be introducedby placing an ether chamber directly on the mask and between themask and bag, as is usual with all gas-ether apparatus. The chimneypiece of the Gwathmey gas-ether apparatus, to which the gas bag isattached, has been retained. This contains the inspiratory and ex-piratory valves upon a sliding cuff. With this cuff, the anesthetist canregulate the patients breathing, through valves, partly through valves,rebreathing entirely, or, as is generally the case, rebreathing with theexpiratory valve slightly open. Positive Pressure.—Five mm. of mercury pressure in the re-breathing bag have been found a very great help in those subjectsusually considered unsuitable for nitrous oxid and oxygen. NITROUS OXID 17b Endotracheal Insufflation.—The apparatus was especially de-vised
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