Cochlear implants with offset coils for transmission of radio frequency links
First Claim
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1. A transcutaneous tissue stimulating system comprising:
- a) an external portion for location on a first side of a partition, said external portion including a first coil for transmission of RF power, arranged to form an arc of a first radius and being retained by means of a first coil platform said coil platform engaging a first magnet; and
b) an internal portion for location on a side opposite the first side of said partition, including a second coil for receiving RF power, arranged to form an arc of a second radius said second coil being mounted on a second coil platform said second coil platform engaging a second magnet for attraction to said first magnet;
wherein the first and second coil, platform and magnets are arranged so that upon minimising the distance between said first and second magnets the centres of the first and second arcs are radially offset.
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Abstract
In an implantable prosthesis system such as a cochlear implant, a pair of coils are used to exchange control and/or power signals between the external and internal components. The coils are offset or displaced laterally by a predetermined distance to reduce variations in the signal transmission due to the spacing between the external and internal components.
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Citations
26 Claims
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1. A transcutaneous tissue stimulating system comprising:
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a) an external portion for location on a first side of a partition, said external portion including a first coil for transmission of RF power, arranged to form an arc of a first radius and being retained by means of a first coil platform said coil platform engaging a first magnet; and
b) an internal portion for location on a side opposite the first side of said partition, including a second coil for receiving RF power, arranged to form an arc of a second radius said second coil being mounted on a second coil platform said second coil platform engaging a second magnet for attraction to said first magnet;
wherein the first and second coil, platform and magnets are arranged so that upon minimising the distance between said first and second magnets the centres of the first and second arcs are radially offset. - View Dependent Claims (2, 3, 4, 5)
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6. A transcutaneous tissue stimulating system comprising:
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a) an external portion for location on a first side of a partition, said external portion including a first coil for transmission of RF power, arranged to form an arc of a first radius and being retained by means of a first coil platform said coil platform engaging a first magnet in one of a first and a second selectable positions, said selectable positions being radially offset from each other; and
b) an internal portion for location on a side opposite the first side of said partition, including a second coil for receiving RF power, arranged to form an arc of a second radius said second coil being mounted on a second coil platform said second coil platform engaging a second magnet for attraction to said first magnet;
wherein the first and second coil, platform and magnets are arranged so that when said first magnet is engaged in said first selectable position then upon minimising the distance between said first and second magnets the centres of said first and second arcs are radially co-located and when said first magnet is engaged in said second selectable position then upon minimising said distance said centres are radially offset. - View Dependent Claims (7, 8, 9)
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10. An implantable prosthesis comprising:
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an internal component constructed and arranged to be implanted in a patient'"'"'s body, said internal component including an internal coil; and
an external component constructed and arranged to cooperate with said internal component to provide therapy to the patient, said external component including an external coil for transmission of energy to the internal coil. - View Dependent Claims (11, 12, 13, 14)
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15. A cochlear implant system comprising;
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an external component including a microphone for sensing ambient sounds and generating corresponding electrical signals, a signal processor for processing said electrical signals to generate stimulation signals and a transmitter for transmitting said stimulation signals, said transmitter including a transmit coil; and
an internal component constructed and arranged to be implanted into a patient, said internal component including a receiver for receiving said signals and an electrode assembly for applying stimulation signals corresponding to ambient sounds to a nerve, said receiver including a receive coil;
wherein said transmit and receive coils are offset laterally by a predetermined displacement. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification