Patent ID: 7425196

Claim:
A receiver module adapted to be positioned in an ear canal, the receiver module comprising a receiver having a receiver housing, the receiver being adapted to receive a time dependent electrical signal, the receiver further being adapted to generate outgoing acoustic waves via an output port in the receiver housing in response to the received time dependent electrical signal, an expansible structure surrounding at least part of the receiver housing, the expansible structure having a first opening aligned with the output port of the receiver housing so as to allow for the generated and outgoing acoustic waves to propagate away from the receiver module and into the ear canal, and elastic encapsulation material partly encircling the expansible structure, the elastic encapsulation material being adapted to provide, by expansion of the expansible structure, an expanded second opening aligned with the output port of the receiver housing so as to allow for the generated outgoing acoustic waves to propagate away from the receiver module and into the ear canal.