External charger for an implantable medical device for determining position using phase angle or a plurality of parameters as determined from at least one sense coil
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;
a sense coil, wherein the 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 todetermine a phase angle between the induced signal and the drive signal, anddetermine using the phase angle the position of the charging coil with respect to the IMD.
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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 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 sense coils are 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 a phase angle between the voltage and a driving signal for the charging coil. The determined phase angle can then be used to determine the position of the charging coil relative to the IMD. Additionally, more than one parameter (phase angle, magnitude, resonant frequency) may be determined using the voltage may be used to determine position, including the radial offset and depth of the charging coil relative to the IMD.
163 Citations
17 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; a sense coil, wherein the 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 a phase angle between the induced signal and the drive signal, and determine using the phase angle the position of the charging coil with respect to the IMD. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification