Adjustable fit hearing aids
A hearing aid ( 600 ) includes an earpiece ( 602 ), a casing ( 604 ), and coupling member ( 612 ). The earpiece ( 602 ) is configured to sit at least partially within the user's ear canal when worn. The casing ( 604 ) supports a sound processor ( 608 ) and a microphone ( 606 ) and is configured to sit behind a users ear and in contact with the user's pinna when worn. The coupling member ( 612 ) couples the casing ( 604 ) to the earpiece ( 602 ). The coupling member ( 612 ) has an effective length that is adjustable to accommodate users with different ear geometries.
1 . A hearing aid comprising:
an earpiece configured to sit at least partially within the user's ear canal when worn;
a casing supporting electronics including a sound processor and a microphone and configured to sit behind a user's ear and in contact with the user's pinna when worn; and
a coupling member coupling the casing to the earpiece,
wherein the coupling member has an effective length that is adjustable to accommodate users with different ear geometries,
wherein the casing defines an aperture and a cavity within which the sound processor is disposed,
wherein the effective length of the coupling member can be adjusted by pushing or drawing a portion of the coupling member into the cavity via the aperture,
wherein slack in the portion of the coupling member that is pushed or drawn into the housing is retained within the cavity,
wherein the coupling member is coupled to a first end of a flexible printed circuit board that is disposed within the cavity and a second, opposite end of the flexible printed circuit board is coupled to the electronics, and
wherein the flexible printed circuit board is more flexible than the coupling member.
2 . The hearing aid of claim 1 , further comprising a guide member disposed within the cavity and arranged to help guide the portion of the coupling member that is received within the housing.
3 . The hearing aid of claim 2 , wherein the guide member comprises a rigid tube.
4 . The hearing aid of claim 2 , wherein the guide member is configured such that a loop is formed in the slack, wherein the loop is retained within the cavity.
5 . The hearing aid of claim 4 , wherein the guide member is formed integrally with the casing.
6 . The hearing aid of claim 1 , wherein the coupling member is at least partially formed of a material that stiffens when heat is applied to it, and wherein the effective length of the coupling member is configured to be adjusted by pushing or drawing a portion of the coupling member into the cavity via the aperture while the coupling member is in a loose flexible state, and the effective length is fixed in place by applying heat to stiffen the coupling member.
7 . The hearing aid of claim 1 , wherein the slack includes a loop that is retained within the cavity.
8 . The hearing aid of claim 1 , further comprising a gasket disposed in the aperture and providing a friction surface that inhibits movement of the coupling member.
9 . The hearing aid of claim 8 , wherein the gasket provides a seal between the coupling member and the casing.
10 . The hearing aid of claim 8 , wherein the gasket is an O-ring.
11 . The hearing aid of claim 1 , wherein flexible printed circuit board is integrated into a printed wiring board that supports the electronics in a flex-rigid construction.