Transcutaneous capacitive data link
A cochlear implant is disclosed, comprising: a transcutaneous energy transfer circuit for transcutaneously transferring power across a recipient's skin; and a transcutaneous capacitive data link circuit for transcutaneously transferring data across the recipient's skin, wherein the transcutaneous energy transfer circuit and the transcutaneous capacitive data link circuit operate independently of each other. The transcutaneous capacitive data link circuit comprises: a first pair of capacitors each having an external electrode configured to be externally positioned on a recipient and an internal electrode configured to be internally positioned in the recipient; a first voltage driver having positive and negative terminals each connected to one of the external electrodes, and configured to generate a first voltage drive signal responsive to a first input control signal; and a first differential amplifier circuit connected to the internal electrodes, configured to generate a first output data signal representative of the first input control signal.
1. A cochlear implant comprising:
a transcutaneous energy transfer circuit configured to inductively transfer power across a recipient's skin; and
a transcutaneous capacitive data link circuit configured to capacitively transfer data across the recipient's skin, wherein the transcutaneous energy transfer circuit and the transcutaneous capacitive data link circuit are configured to operate independently of each other.
2. The cochlear implant of claim 1 , wherein the transcutaneous capacitive data link circuit comprises:
a first pair of capacitors each having an external electrode configured to be externally positioned on a recipient and an internal electrode configured to be internally positioned in the recipient;
a first voltage driver having positive and negative terminals each connected to one of the external electrodes, and configured to generate a first voltage drive signal responsive to a first input control signal; and
a first differential amplifier circuit connected to the internal electrodes, configured to generate a first output data signal representative of the first input control signal.
3. The cochlear implant of claim 2 , wherein the transcutaneous capacitive data link further comprising:
a second pair of capacitors each having an external electrode configured to be externally positioned on a recipient and an internal electrode configured to be internally positioned in the recipient;
a second voltage driver having positive and negative terminals each connected to one of the internal electrodes of the second pair of capacitors, and configured to generate a second voltage drive signal responsive to a second input control signal; and
a second differential amplifier circuit connected to the external electrodes of the second pair of capacitors, configured to generate a second output data signal representative of the second input control signal.
4. The cochlear implant of claim 1 , wherein the transcutaneous energy transfer circuit comprises:
a transcutaneous energy transfer transmitter coil configured to be externally positioned on the recipient; and
a transcutaneous energy transfer receiver coil configured to be internally positioned in the recipient and configured to be inductively coupled to the transmitter coil.
5. The cochlear implant of claim 1 , further comprising:
an external housing configured to house external components of the transcutaneous energy transfer circuit, and external components of the transcutaneous capacitive data link circuit; and
an internal housing configured to house internal components of the transcutaneous energy transfer circuit, and internal components of the transcutaneous capacitive data link circuit.
6. The cochlear implant of claim 1 , wherein the external housing further comprises an external magnet and wherein the internal housing further comprises an internal magnet, wherein the external and internal magnets cooperate to maintain the internal and external components of the transcutaneous energy transfer circuit and transcutaneous capacitive data link circuit in operational alignment.
7. The cochlear implant of claim 2 , wherein the first input control signal comprises a coded sound signal generated by a speech processor unit of the cochlear implant; and
wherein the first output control signal is suitable for receipt by an implanted stimulator unit of the cochlear implant.
8. The cochlear implant of claim 3 , wherein the second input control signal comprises telemetry signals generated by an implanted stimulator unit of the cochlear implant; and
wherein the second output data signal is suitable for receipt by a speech processor unit of the cochlear implant.
9. The cochlear implant of claim 2 , wherein the first differential amplifier circuit comprises:
a differential amplifier; and
a resistive network connected between the differential amplifier and the internal electrodes.
10. The cochlear implant of claim 3 , wherein the second differential amplifier circuit comprises:
a differential amplifier; and
a resistive network connected between the differential amplifier and the internal electrodes.