Charging system incorporating receive coil de-tuning within an implanted device
First Claim
1. A system for transferring power from an external power transfer system (EPTS) to at least one body-implantable active device (BIAD) through a dermis layer, said system comprising:
- an EPTS for being disposed external to a dermis layer of a body; and
a BIAD for being disposed beneath the dermis layer of the body;
the EPTS including;
a transmit coil; and
a transmit coil driver circuit operable to drive the transmit coil with a resonant current;
the BIAD including;
a receive coil tuned to the resonant frequency of the transmit coil and operable to inductively receive power therefrom when in proximity thereto;
a charge storage device;
a charging circuit having an input to which the received power is coupled, and operable to provide on an output thereof a charging current to the charge storage device, and further operable to determine when charging is complete or no longer desired; and
a de-tuning circuit coupled to the receive coil, and operable to detune the receive coil to substantially inhibit power transfer from the transmit coil to the receive coil based upon the charging determination.
3 Assignments
0 Petitions
Accused Products
Abstract
A system for transferring power to, and communicating with, at least one body-implantable active device includes an external power transfer system associated with an external device disposed outside of a body, operable to transfer power through a dermis layer to each body-implantable active device, and communicate data to and from each body-implantable active device, and also includes a power receiving system associated with each body-implantable active device, operable to receive power transferred from the external power transfer system, and communicate data to and from the external power transfer system. The body-implantable active device may include an implantable neurostimulation system.
128 Citations
20 Claims
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1. A system for transferring power from an external power transfer system (EPTS) to at least one body-implantable active device (BIAD) through a dermis layer, said system comprising:
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an EPTS for being disposed external to a dermis layer of a body; and a BIAD for being disposed beneath the dermis layer of the body; the EPTS including; a transmit coil; and a transmit coil driver circuit operable to drive the transmit coil with a resonant current; the BIAD including; a receive coil tuned to the resonant frequency of the transmit coil and operable to inductively receive power therefrom when in proximity thereto; a charge storage device; a charging circuit having an input to which the received power is coupled, and operable to provide on an output thereof a charging current to the charge storage device, and further operable to determine when charging is complete or no longer desired; and a de-tuning circuit coupled to the receive coil, and operable to detune the receive coil to substantially inhibit power transfer from the transmit coil to the receive coil based upon the charging determination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for transferring power from an external power transfer system (EPTS) to at least two body-implantable active devices (BIADs) through a dermis layer, said system comprising:
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an EPTS disposed external to a dermis layer of a body; and at least two BIADs disposed beneath the dermis layer of the body; the EPTS including; a group of at least two transmit coils disposed in series, each corresponding to an associated one of the at least two BIADs; a transmit coil driver circuit operable to drive the group of at least two transmit coils with a resonant current; and a control circuit operable to disable the transmit coil driver circuit; each of the at least two BIADs respectively including; a receive coil tuned to the resonant frequency of the corresponding transmit coil and operable to inductively receive power therefrom when in proximity thereto; a charge storage device; a charging circuit having an input to which the received power is coupled, and operable to provide on an output thereof a charging current to the charge storage device, and further operable to determine when charging is complete or no longer desired; and a de-tuning circuit coupled to the receive coil, and operable to detune the receive coil to substantially inhibit power transfer from the corresponding transmit coil to the receive coil based upon the charging determination; wherein the control circuit is operable to disable for at least a certain time the transmit coil driver circuit in response to a determination that the respective receive coil for each BIAD is currently de-tuned. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification