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The stream of water from the nozzles of various ear syringes is not delivered into the external auditory canal to the best advantage.
The old theory is that, the canal being curved, the water will strike a curved portion, be deflected from the prominences to the valleys, get under the foreign substance, and force it out.
This is true when the water strikes right; but the canal is so irregular in many of its dimensions and varies so much at different ages and under so many different conditions (especially if the canal is misshapen with long impactions of cerumen), that the stream of water must be directed at many different angles before we can remove cerumen or other foreign matter.
The surprising deviations of the external auditory canal are most strikingly illustrated by an observation of the contours of fusible metal casts of this canal. Therefore, I felt that if
Goldnamer WW. NEW NOZZLES FOR EAR SYRINGE. JAMA. 1925;85(2):112. doi:10.1001/jama.1925.26710020002015b
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