Abstract: The invention relates to a programmable hearing aid with an amplifier and transmission section whose transmission characteristics can be controlled, with a control unit (1), with a transmitter for wireless transmission of control signals to the hearing aid (6) and a receiver (7) located therein for receiving and demodulating control signals, whereby the external control unit (1) contains an initial memory (20) for some of the parameters which determine the transmission characteristics of the hearing aid, a control panel with entry keypad (5) for recalling such parameters from the memory, a transmitter (4) which can be modulated with these parameters as control signals and a digital control unit (3) and whereby the hearing aid contains a further control unit (8) which can be activated by the control signals after they have been demodulated, for control of the transmission section.

Abstract: The invention relates to a process for manufacturing an in-the-ear-canal hearing aid with microphone, amplifier, volume control, battery compartment with battery, and earphone, together with an individually matched ear-piece by making an impression of the ear canal for producing a casting mold and filling the casting mold with a polymerizable plastic.The new process involves pulling at least one prefabricated plastic hollow body, matched to the dimensions of the earphone and the other components, into the casting mold, filling the cavity between the hollow body and casting mold with polymeriable plastic, polymerizing the plastic and completing the hearing aid by inserting the earphone and the other components into the completed ear-piece, including securing a cover plate to the ear-piece, after stripping and removal of all parts not required.

Abstract: The invention relates to an in-the-ear hearing aid for people with impaired or defective hearing, with an ear-piece containing a microphone, amplifier, telephone, battery compartment with battery, on/off switch and volume control and closed by a cover plate; a hollow space (6) to the auricular canal is provided for at the inner end of the ear-piece (1) between the sound outlet connector (4) of the telephone (3) and the sound outlet (5) of the hearing air, this hollow space forming a resonator in conjunction with the sound outlet.

Abstract: An apparatus for use in adjusting a secondary adjustment device of a hearing aid consists of an adaptor that can be so placed on the hearing aid that the adjustment device of the hearing aid becomes coupled to corresponding moving elements on the adaptor. These moving elements are in turn coupled to their respective activation controls on a control desk through respective wires in a bowden cable, enabling the secondary adjustment device of the hearing aid to be adjusted by manipulating the activation controls at the control desk.