File:Anæsthesia and anæsthetics general and local (1903) (14779633071).jpg

Identifier: ansthesiaansthe00pat (find matches)
Title: Anæsthesia and anæsthetics general and local
Year: 1903 (1900s)
Authors: Patton, Joseph M(cIntyre), 1866- (from old catalog)
Subjects:
Publisher: Chicago, Cleveland press
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Text Appearing Before Image:
er end is closed by a cap. At the inner endof the sliding tube is a coil spring EE, abutting against a shoulder in thebody of the Inhaler. This spring holds the sliding tube in the positionshown in the cuts, closing the inlet B when the gas is not being used.Pressure on the cap compresses the spring, closes the perforations for theadmission of air, and brings the opening A over B, affording a free flowof gas to the mouth-piece through the inhaling valve. The sliding tube isprevented from rotating by the screw-pin D, which works in a slot, C. Theinhaling and exhaling valves—the former internal, the latter external—consist of two thin disks of mica, FF. which are inclosed in circular opencages. The inhaling valve is opened in respiration by being drawn againstthe front of the cage, the exhaling valve being closed by the pressure ofthe outside air. In expiration both disks are thrown against the furtherends of the cages, opening the exhaling and closing the inhaling. So NITROUS OXIDE
Text Appearing After Image:
Fig. 18.—No. 3 Inhaler and Flexible Mouthpiece. (White Dent. Co.) enter from the reservoir, with a slight positive pressure, exceptin children and weak persons. Excitement should be controlledby increasing the pressure in the bag, as the disturbance will NITROUS OXIDE 8l probably be due to admission of air, which is not likely to occurunder higher pressure. A slight amount of air is often of advan-tage in children and weak people. There has been considerable argument as to the propriety andadvantage of rebreathing of gas, or to-and-fro breathing directlyin and out of the bag. Hygienically it is, of course, objection-able, and obviously not admissable in the early stage of admin-istration, but is said to have advantages during the latter partof the inhalation period in that it leads to a longer available pe-riod of anaesthesia, and, while taking a little longer to producecomplete anaesthesia and being followed by a slower return toconsciousness, it produces no bad effects. It would s

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