A manual of diseases of the throat and nose : including the pharynx, larynx, trachea, oesophagus, nose and naso-pharynx . e should be made at an obtuse angle. In cases of ste-nosis, where a very long tube has to remain in the trachea, Mr. Parkers suggestionmay be of use, but even in these cases Konigs tube see * flexible canula ) wouldmost probably be found more convenient. In ordinary cases the rectangular tube an-swers perfectly well, the extreme shortness of its descending portion reducing the back-ward inclination of the trachea to a matter of no importance. In order to introduceMr. Parker
A manual of diseases of the throat and nose : including the pharynx, larynx, trachea, oesophagus, nose and naso-pharynx . e should be made at an obtuse angle. In cases of ste-nosis, where a very long tube has to remain in the trachea, Mr. Parkers suggestionmay be of use, but even in these cases Konigs tube see * flexible canula ) wouldmost probably be found more convenient. In ordinary cases the rectangular tube an-swers perfectly well, the extreme shortness of its descending portion reducing the back-ward inclination of the trachea to a matter of no importance. In order to introduceMr. Parkers tube into the throat without hurting the patient, it is necessary to use apilot, similar to that supplied with Mr. Durhams instrument; but for the purpose ofpermitting the introduction of the inner tube without employing lobster-joints. has the angular portion and contiguous pnrts of the upper surface of his innertube cut away. It need scarcely be pointed out that this arrangement greatly dimin-ishes the value of the inner tube, as the secretions come in contact with a large sur-face of the outer Fig. 104.—The Permanent Right-angled Can-ula (Durhams, slightly modified): m, mouth,of inner tube ; b, bolt which fixes in inner tube ;.s. slot, which, when turned round opposite to 6,unlocks the bolt, and enables the canula to bewithdrawn : s, slit at orifice of mouthpiece of in-ner canula, which exactly corresponds in position*and moves with g. From its superficial position,s can be easily felt, and the patient or practitionercan readily guide the inner tube into the desiredposition, whether for the purpose of introductionor removal. TRACHEAL INSTRUMENTS. 375 tube of the right-angled canula, as well as the corresponding portion of thepilot, have to be made with joints on the lobster-tail principle. A set oftracheotomy tubes should contain four sizes, with the following diame-ters: No. 1, one centimetre; No. 2, nine millimetres; No. 3, seven milli-metres; No. 4,
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherne, booksubjectnose
