Apparatus and method for estimating battery condition in implantable cardioverter/defibrillators
First Claim
Patent Images
1. A method for determining the operating status of a battery in an implantable cardioverter/defibrillator, comprising:
- intermittently measuring an open circuit battery voltage, and determining a present open circuit voltage status as being one of a plurality of open circuit voltage status states ranging from best to worst based upon the voltage measurement;
intermittently reforming an electrolytic capacitor by charging the capacitor to full voltage and measuring the time required for such charging, and determining a present capacitor charge time status as being one of a plurality of capacitor charge time states ranging from best to worst based upon the charge time measurement;
determining a present operating status of the battery to be one of a plurality of operating status states ranging from best to worst based upon a combination of the present open circuit voltage status and capacitor charge time status; and
, adjusting a time interval for periodically reforming the electrolytic capacitor in a manner dependent upon the present operating status of the battery.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus and method for determining the condition of a battery in an implantable cardioverter/defibrillator. A battery'"'"'s operating status is determined from measurements of its open circuit voltage and the time required to charge an energy storage capacitor.
64 Citations
22 Claims
-
1. A method for determining the operating status of a battery in an implantable cardioverter/defibrillator, comprising:
-
intermittently measuring an open circuit battery voltage, and determining a present open circuit voltage status as being one of a plurality of open circuit voltage status states ranging from best to worst based upon the voltage measurement;
intermittently reforming an electrolytic capacitor by charging the capacitor to full voltage and measuring the time required for such charging, and determining a present capacitor charge time status as being one of a plurality of capacitor charge time states ranging from best to worst based upon the charge time measurement;
determining a present operating status of the battery to be one of a plurality of operating status states ranging from best to worst based upon a combination of the present open circuit voltage status and capacitor charge time status; and
,adjusting a time interval for periodically reforming the electrolytic capacitor in a manner dependent upon the present operating status of the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. An implantable cardioverter/defibrillator device, comprising:
-
a sensing channel for sensing cardiac depolarizations;
an energy storage capacitor switchably connected to shock electrodes for delivering a defibrillation shock pulse;
a battery;
a charging circuit for charging the energy storage capacitor from the battery;
a voltage monitor for monitoring the voltage of the energy storage capacitor;
a controller for operating the charging circuit to charge the energy storage capacitor to a specified voltage upon detection of an arrhythmia and delivering a defibrillation shock pulse by switching the energy storage capacitor to the shock electrodes; and
,wherein the controller is configured to;
intermittently measure an open circuit battery voltage, and determine a present open circuit voltage status as being one of a plurality of open circuit voltage status states ranging from best to worst based upon the voltage measurement;
intermittently reform the energy storage capacitor by charging the capacitor to full voltage and measure the time required for such charging, and determine a present capacitor charge time status as being one of a plurality of capacitor charge time states ranging from best to worst based upon the charge time measurement;
determine a present operating status of the battery to be one of a plurality of operating status states ranging from best to worst based upon a combination of the present open circuit voltage status and capacitor charge time status; and
,adjust a time interval for periodically reforming the electrolytic capacitor in a manner dependent upon the present operating status of the battery. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
-
Specification