Deafness practically illustrated / [James Yearsley].

  • James Yearsley
Date:
[1849]
Catalogue details

Licence: Public Domain Mark

Credit: Deafness practically illustrated / [James Yearsley]. Source: Wellcome Collection.

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    b the tone or “timbre” of the sound approaching the membrane is to the note proper to the membrane itself, the more distinct and perceptible does it become.* : After this exposition of the direct and indirect offices of the Eustachian tube, of the manner in which ob- structions occur in it, and of the principles on which the resulting deafness depends, it must be plainly evi- dent, that the restoration of the natural condition by opening the tubes, will be the most easy and satisfac- tory method of curing the impaired hearing; especially as this operation, in the hands of a practised operator, with powers of delicate manipulation, and thorough knowledge of the parts, is void of difficulty, and entirely free from pain. When the occlusion of the Eustachian tube depends simply on an accumulation of inspissated mucus, the introduction of the catheter, by removing the obstruc- tion, and supplying the tympanic cavity with air, occa- sions so sudden a return of the power of hearing, as to astonish the patient upon whom the operation is per- formed. The cure of the variety of deafness dependent on this cause, though it has existed for many years, is often performed in an incredibly short space of time. More frequently, the long persistence of the disorder has rendered it in some degree complicated, and it is requisite to syringe the ears through the tube, for the purpose of removing the sordes contained in the tym- panum. This plan frequently requires to be adopted in otorrheea from the external meatus. If often hap- pens, that after the discharge has been cured by ap- plications to the external ear, the deafness remains
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