External Charger for an Implantable Medical Device Having Alignment and Centering Capabilities
First Claim
1. An external charger for wirelessly providing energy to an implantable medical device (IMD), comprising:
- a charging coil configured when energized by a drive signal to produce a magnetic field to wirelessly provide energy to the IMD as a coupled system;
at least one sense coil, wherein each at least one sense coil is configured to be induced by the magnetic field with an induced signal affected by a position of the charging coil with respect to the IMD; and
control circuitry configured to determine from at least one parameter determinable using each induced signal one of a plurality of positions of the charging coil with respect to the IMD, wherein the positions comprise whether the charging coil is (i) centered, (ii) not centered but not misaligned, and (iii) misaligned, with respect to the IMD.
1 Assignment
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Accused Products
Abstract
A charging system for an Implantable Medical Device (IMD) is disclosed having a charging coil and one or more sense coils. The charging coil and one or more sense coils are preferably housed in a charging coil assembly coupled to an electronics module by a cable. The charging coil is preferably a wire winding, while the one or more sense coils are concentric with the charging coil and preferably formed in one or more traces of a circuit board. One or more voltages induced on the one or more sense coils can be used to determine whether the charging coil is (i) centered, (ii) not centered but not misaligned, or (iii) misaligned, with respect to the IMD being charged, which three conditions sequentially comprise lower coupling between the charging coil and the IMD. A charging algorithm is also disclosed that control charging dependent on these conditions.
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Citations
18 Claims
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1. An external charger for wirelessly providing energy to an implantable medical device (IMD), comprising:
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a charging coil configured when energized by a drive signal to produce a magnetic field to wirelessly provide energy to the IMD as a coupled system; at least one sense coil, wherein each at least one sense coil is configured to be induced by the magnetic field with an induced signal affected by a position of the charging coil with respect to the IMD; and control circuitry configured to determine from at least one parameter determinable using each induced signal one of a plurality of positions of the charging coil with respect to the IMD, wherein the positions comprise whether the charging coil is (i) centered, (ii) not centered but not misaligned, and (iii) misaligned, with respect to the IMD. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification