Patent ID: 9339660
Filing Date: 2016-05-17
CPC Classification: A61N

Claim Text:
1. An implantable medical device, comprising: a coil configured to receive a magnetic charging field from an external charger, wherein the coil comprises a center axis; a plurality of magnetic field sensors each configured to measure a strength of the magnetic charging field, wherein one of the plurality of magnetic field sensors is located at the center axis of the coil and wherein others of the plurality of the magnetic field sensors are located equidistant to the center axis; telemetry circuitry configured to transmit alignment data to the external charger, wherein the alignment data is indicative of external charger alignment with respect to the implantable medical device, and wherein the alignment data comprises or is derived from the measured strengths; and charging circuitry configured to use the received magnetic charging field to provide operational power to the implantable medical device.