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Multi-purpose thin shielded wire for a hearing aid Disclosure Number: IPCOM000215486D
Publication Date: 2012-Mar-01
Document File: 1 page(s) / 21K

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The Prior Art Database


A multi-conductor thin shielded wire for a hearing aid consisting of individually enameled (lacquered) strands with different colors allows manufacture of a shield cable with a core of multiple wire conductors having a reduced thickness in comparison to prior art shielded cables.

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Multi-purpose thin shielded wire for a hearing aid

In the field of hearing aids the various parts are electronically connected to each other. In the particular case of hearings aids consisting of a Behind-the-ear portion and a Receiver-in-canal portin a cable runs from behind the ear to the ear canal containing several separate wires to provide the required connectivity. This results in a portion of the calbe being visible at the side of the head which reduces the cosmetic appeal of such hearing saids. Therefore the drive is to have the cable and wires as thin as possible. The cable also has to be very flexible in order to be adaptable to the individual intended user of the hearing aid.

State of the art

Wires can be solid or stranded. A stranded wire provides more flexibility, but is slightly thicker then soild for the same conduction. In addition, solid core wire are usually avoided for two reasons: skin effect and stiffness: stranded wires are just much more pliant.

When desiring a multi-conductor shielded cable, the prior art solution is to have those stranded wires made and isolated individually, then they are combined in a shield wrapped-around or weaved (see figure A). The result is a cable with multiple conductors of which each condutctor is constituted by a stranded wire. Thise cable is realitively thick compared to non-shielded wire solutions in hearing aids and esp. for RIC modules.

New solution

A new approach is to have the core wire of the cable cons...