(57) Improvement in the closure plate and control unit of hearing aids to be inserted
into the auditory meatus of the hard of hearing, also called intracanal hearing aids,
characterized by an extremely reduced size, which unit is housed in an opening of
the closure plate and fastened therein by means of rotating ratchet members; the unit
is so shaped as to receive only a portion of the battery, namely the central portion,
while the polar portions thereof are received in the opening formed in the closure
plate; this shape makes it possible a further reduction in the size of the unit, the
circular small cover thereof resting and being supported by the edge of the opening
housing the unit rather than by portions of the body of said unit, thereby operating
also as a cover for said opening.
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