METHODS, IMPLANTABLE MEDICAL DEVICES, AND SYSTEMS THAT ABORT A HIGH VOLTAGE CHARGE WHEN A TRANSFORMER IS IMPAIRED

摘要

High voltage charging is aborted when it is detected that a transformer providing the high voltage charge is impaired and is providing an impedance that is too low. In one instance, a voltage for a battery that provides power to the transformer is measured when the battery is substantially unloaded and a voltage is later measured when the battery is loaded during the high voltage charge. A dynamic threshold voltage is computed based on a chosen threshold impedance representing the impedance of the transformer and based the substantially unloaded voltage and on an internal resistance of the battery. When the loaded voltage is less than the threshold voltage, then the high voltage charging is aborted.

主权项

1. A method of aborting a high voltage charge of a capacitor within an implantable medical device when a transformer of the implantable medical device that produces the high voltage charge is impaired, comprising:
obtaining a substantially unloaded value for a battery of the implantable medical device that provides voltage across a primary coil of the transformer; computing a dynamic threshold value based on the substantially unloaded value, a value representing a resistance of the battery, and a value representing a threshold impedance of the primary coil; obtaining a loaded value of the battery when performing a high voltage charge; and comparing the loaded value to the threshold value, and when the difference between the loaded value and the threshold value indicates that the transformer is impaired, then aborting the high voltage charge.