External button processor with a rechargeable battery
An external processor device is described for an implantable prosthetic system. An external processor housing has a generally planar skin contacting surface and a central axis perpendicular to the skin contacting surface. A signal processor is located within the processor housing for developing an implant data signal. The processor housing also contains a transmitter coil for coupling the implant data signal across the skin to the implantable prosthetic system. A battery compartment is also located within the processor housing in an annular region around the central axis for containing a battery arrangement to provide electrical power to the signal processor and the transmitter coil.
1. An external processor device for an implantable prosthetic system, the device comprising:
an external processor housing having a generally planar skin contacting surface and a central axis perpendicular to the skin contacting surface;
a signal processor within the processor housing for developing an implant data signal;
a transmitter coil within the processor housing for coupling the implant data signal across the skin to the implantable prosthetic system; and
a battery compartment within the processor housing in a complete annular ring around the central axis for containing a battery arrangement to provide electrical power to the signal processor and the transmitter coil.
2. A device according to claim 1 , further comprising:
an external positioning magnet radially inward of the battery compartment for magnetically interacting with a corresponding internal positioning magnet in the implantable prosthetic system to hold the device in a fixed position on the skin.
3. A device according to claim 2 , wherein the battery arrangement includes at least one battery cell having a plurality of conductive band plates arranged to be parallel to magnetic field lines which originate from the transmitter coil.
4. A device according to claim 3 , wherein the battery arrangement includes a plurality of battery cells, each cell occupying an annular section within the battery compartment.
5. A device according to claim 4 , wherein each battery cell has the same size.
6. A device according to claim 4 , wherein one of the battery cells is larger than the others.
7. A device according to claim 1 , wherein the device has a center of mass displaced from the central axis so as to define a preferred rotational position of the device on the skin with the center of mass below the central axis.
8. A device according to claim 1 , wherein the battery compartment forms a partial annular section about the central axis.
9. A device according to claim 1 , wherein the battery arrangement is rechargeable.
10. A device according to claim 1 , wherein the implantable prosthetic system is a cochlear implant system.
11. A replacement battery arrangement for a device according to any of claims 1 - 7 and 8 - 10 .