METHOD FOR MONITORING END OF LIFE FOR BATTERY
First Claim
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1. A pacemaker, including:
- a battery power terminal for a pacemaker battery;
sensing and pacing control circuitry electrically connected to the battery power terminal;
a pacing supply storage (PSS) capacitor electrically connected to the battery power terminal and to a discharge switch;
comparison circuitry, including;
a first comparator electrically connected to the battery power terminal and adapted for comparing a battery terminal voltage (Vbatt) to a brownout voltage (Vstop), the first comparator having a first comparator output;
a second comparator electrically connected to the PSS capacitor and adapted for comparing a pacing supply storage voltage (Vcs) to at least one reference voltage (Vx), the second comparator having a second comparator output, wherein the first comparator output and the second comparator output are adapted to control current flow from the battery power terminal to the PSS capacitor; and
charge time measurement (CTM) control circuitry electrically connected to the sensing and pacing control circuitry, the comparator circuitry and the discharge switch, the charge time measurement control circuitry being adapted to;
access a predetermined set of charge time measurement set-up parameters and a predetermined elective replacement time (ERT) charge time limit determined from a battery resistance ERT target that corresponds to a charge depletion target;
determine a rate of charge storage in the PSS capacitor using the predetermined set of charge time measurement set-up parameters;
compare the determined rate of charge storage in the PSS capacitor to the predetermined ERT charge time limit for the predetermined set of charge time measurement set-up parameters; and
declare an ERT based on a number of comparisons between the determined rate of charge storage in the charge storage capacitor and the ERT charge time limit.
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Abstract
A system is described. The system includes a lithium battery, a charge storage capacitor electrically connected to the lithium battery, a first device, and at least one second device. The first device is electrically connected to the lithium battery and is powered by the lithium battery. The at least one second device is attached to the charge storage capacitor and adapted to read a rate of charge storage in the charge storage capacitor or to calculate the rate of charge storage by measuring both a time of charging and a charge stored or added to the charge storage capacitor during the time of charging.
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Citations
16 Claims
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1. A pacemaker, including:
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a battery power terminal for a pacemaker battery;
sensing and pacing control circuitry electrically connected to the battery power terminal;
a pacing supply storage (PSS) capacitor electrically connected to the battery power terminal and to a discharge switch;
comparison circuitry, including;
a first comparator electrically connected to the battery power terminal and adapted for comparing a battery terminal voltage (Vbatt) to a brownout voltage (Vstop), the first comparator having a first comparator output;
a second comparator electrically connected to the PSS capacitor and adapted for comparing a pacing supply storage voltage (Vcs) to at least one reference voltage (Vx), the second comparator having a second comparator output, wherein the first comparator output and the second comparator output are adapted to control current flow from the battery power terminal to the PSS capacitor; and
charge time measurement (CTM) control circuitry electrically connected to the sensing and pacing control circuitry, the comparator circuitry and the discharge switch, the charge time measurement control circuitry being adapted to;
access a predetermined set of charge time measurement set-up parameters and a predetermined elective replacement time (ERT) charge time limit determined from a battery resistance ERT target that corresponds to a charge depletion target;
determine a rate of charge storage in the PSS capacitor using the predetermined set of charge time measurement set-up parameters;
compare the determined rate of charge storage in the PSS capacitor to the predetermined ERT charge time limit for the predetermined set of charge time measurement set-up parameters; and
declare an ERT based on a number of comparisons between the determined rate of charge storage in the charge storage capacitor and the ERT charge time limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system, comprising:
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a pacing storage capacitor;
a battery power terminal for a battery, the terminal being electrically connected to the pacing storage capacitor to charge the pacing storage capacitor;
a discharge switch electrically connected to the pacing storage capacitor; and
control circuitry electrically connected to the discharge switch to selectively discharge the storage capacitor and electrically connected to the pacing storage capacitor to detect a voltage across the pacing storage capacitor, the control circuitry to perform a time measurement for determining a rate of charge storage in the pacing storage capacitor, wherein the control circuitry is adapted to;
discharge the pacing storage capacitor to a predetermined voltage level (Vd) prior to beginning the time measurement;
detect when the voltage across the pacing storage capacitor reaches a predetermined initial voltage level (VI) to begin the time measurement; and
detect when the voltage across the pacing storage capacitor reaches a predetermined final voltage (VF) to end the time measurement. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification