Peter Nassler

Hearing aid with cerumen trapping gap

A hearing aid has a sound-conducting tube, the distal end of which extends into the auditory meatus. The tube is mounted to an earpiece which closes off the ear canal. A protrusion surrounds the distal end and extends from the earpiece. A cap is detachably secured to the protrusion and is perforated to permit sound to travel into the ear, and the cap and the earpiece form a cerumen-trapping gap. The earpiece of the hearing aid has a substantially flat end plate adjacent the protrusion and the end plate bears a groove which surrounds the protrusion.

Method and apparatus for producing an ear impression

On the basis of a hollow die including over-shell and a cap drawn onto a proximal connector of the die, an ear impression is produced directly in the auditory canal that is filled with ear impression material. Displaced ear impression material thereby flows through a channel in the cap into the hollow interior of the die. A negative is produced from the ear impression together with a screwed-on fixing star, this negative containing impressions of the points of the fixing star. After injection of otoplastic material and repositioning of a fixing star with a die, over-shell and cap into the fixing depressions, a finished otoplastic shell can then be produced from the negative.

Apparatus for srewing a cover onto a screw neck of a hearing aid

A rotary shaft is provided with at least two pins at its one end, these two pins fitting into two holes of the cover. The other end of the rotary shaft carries a polygonal screw pin for screwing on the adaptor.

Method and apparatus for making comparative acoustic measurements

A single opto-plastic 7 is provided which can be inserted into the auditory passage of an ear which is to be serviced and has an outside contour which matches the auditory passage and includes a hollow interior 6 which communicates with the outside through a sound passage 9. The hollow interior 6 is shaped so that it can receive an in the ear hearing aid 3 or a coupling (4, 5) for a behind the ear hearing aid, thus allowing either of the units to be quickly connected to the opto-plastic ear piece 7 so that comparative measurements can be made by the patient.