A manual of diseases of the throat and nose : including the pharynx, larynx, trachea, oesophagus, nose and naso-pharynx . ory of the subject, the tracheal canula has undergone variousmodifications since it was first invented. The instrument commonly em-ployed consists of a silver tube, the curve of which corresponds to thearc of a quadrant. It is introduced into the trachea in such a way thatthe larger end of the instrument looks directly forward and projects alittle from the surface of the wound, and it is prevented from falling intothe windpipe by means of a transverse collar, or shield, art
A manual of diseases of the throat and nose : including the pharynx, larynx, trachea, oesophagus, nose and naso-pharynx . ory of the subject, the tracheal canula has undergone variousmodifications since it was first invented. The instrument commonly em-ployed consists of a silver tube, the curve of which corresponds to thearc of a quadrant. It is introduced into the trachea in such a way thatthe larger end of the instrument looks directly forward and projects alittle from the surface of the wound, and it is prevented from falling intothe windpipe by means of a transverse collar, or shield, articulated to itby a joint which permits of considerable play between the two portionsof the instrument. The ends of the shield slant slightly backward so asto correspond with the curve of the neck, and each is perforated by alarge oval opening (Fig. 104, t) for the tapes,3 by means of which the in-strument is held in place. The lower extremity of the tube is directeddownward and its axis should correspond with the long axis of the order to facilitate introduction, the canula is, or ought to be, fitted with. 2Fig. 102.—Durhams Right-angled Canula : A, the canula, with pilot; B, the inner tube. a pilot consisting of three portions, viz., a firm handle, a shank whichpasses down the canula, and a conical end which projects from the distalextremity of the canula when the instrument is prepared for use. The•canula is also provided with an inner tube which can be easily removedand cleaned, and should be a little longer than the canula proper () so as to provide against the accumulation of mucus. To prevent itsbeing forced out by coughing, the inner tube can be bolted to the Canula.—The principal objection to the tube just describedis that, from the nature of its curve, it often irritates or even cuts intothe anterior wall of the trachea, and in inventing the right-angled tubewith its long horizontal and short vertical portions, Mr. Durham4 hasmade
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherne, booksubjectnose
