A text-book on diseases of the ear, nose and throat . ; but in this casethe disadvantages are the stiflness of thecatheter and its great liability to snap in method of inflation depends uponthe i)hysiological fact that, at the moment ofswallowing, the velum palati rises and therebydraws the anterior wall of the Eustachian tubefrom the i30sterior. At this moment the faucialextremity of the tube is so patulous that airforced through the nares, not being able tol^ass downward into the fauces and mouth,because the velum palati prevents it, will byfollowing the course of least resist
A text-book on diseases of the ear, nose and throat . ; but in this casethe disadvantages are the stiflness of thecatheter and its great liability to snap in method of inflation depends uponthe i)hysiological fact that, at the moment ofswallowing, the velum palati rises and therebydraws the anterior wall of the Eustachian tubefrom the i30sterior. At this moment the faucialextremity of the tube is so patulous that airforced through the nares, not being able tol^ass downward into the fauces and mouth,because the velum palati prevents it, will byfollowing the course of least resistance passinto the tube and usually into the tympana. In order to accomplish this result at thedesired moment, the patient is instructed totake a sip of water and retain it in his mouthuntil told to swallow. After the water hasbeen thus taken, let the surgeon place thecurved nose-piece into either nostril and com-press the nostril in front of the nose-piece. The usual error is made intrying to compress the ala of the nostril down upon the Politzers air-bag for inflatingthe middle ears ; one-third naturalsize. INSTRUMENTAL EXAMINATION OF THE EAR. 87 Fig. 67, This is very painful to the patient, is apt to make him jump, and thus thesurgeon is defeated. The index-finger should compress the other nostrilso that no air from the bag shall escajDe outward through the nose. Thepoint of the nose-piece should be directed outward against the ala ratherthan inward against the bony septum. If the latter is done, and itusually is the mistake of beginners, the septum will be painfully pressedif not wounded, and bleeding from the nose may be the very undesirableresult. In using this method of inflation, one ear of the patient may be con-nected by the auscultation-tube to the ear of the surgeon ; but this is byno means necessary, since, as a rule, when the method is properly carriedout, a peculiar resistance or recoil ensues in the inflation-bag. which thesurgeon soon learns to reco
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