초록 ▼

Improved methods of determining the recommended replacement time (RRT), and therefore extending the longevity, of implantable electronic medical devices, especially implantable cardioverter-defibrillators, pacemakers and similar devices which rely on a battery having at least a minimal charge in ord

Improved methods of determining the recommended replacement time (RRT), and therefore extending the longevity, of implantable electronic medical devices, especially implantable cardioverter-defibrillators, pacemakers and similar devices which rely on a battery having at least a minimal charge in order for the device to perform its intended function and devices employing these methods are described. In one embodiment the improved method entails independent measurement of at least two different indicators of battery strength, at least one of which is affected by the battery's internal impedance. In a preferred embodiment, terminal battery voltage and capacitor charge time are independently monitored. If the terminal battery voltage falls below a predetermined minimum threshold or the capacitor charge time is confirmed to exceed a predetermined maximum charge time, an RRT signal is issued. In an alternative embodiment, an RRT signal is also issued by the medical device when one indicator of battery strength, for example, battery terminal voltage, falls below a predetermined intermediate voltage but is above the minimum threshold voltage and a second indicator of battery strength, for example, capacitor charge time, exceeds its predetermined maximum threshold.

대표청구항 ▼

[ What is claimed is:] [1.] An implantable cardioverter/defibrillator (ICD) comprising:a battery;a capacitor, chargeable by the battery;voltage measuring means, capable of measuring the terminal voltage of the battery;capacitor reforming means, for reforming the capacitor;capacitor charge timing mea

[ What is claimed is:] [1.] An implantable cardioverter/defibrillator (ICD) comprising:a battery;a capacitor, chargeable by the battery;voltage measuring means, capable of measuring the terminal voltage of the battery;capacitor reforming means, for reforming the capacitor;capacitor charge timing means;recommended replacement time (RRT) signaling means, for issuing an RRT signal; andcontrol logic and timing circuitry having programmable memory, a battery status register and communication means whereby, the control logic and timing circuitry monitors the voltage measuring means and the charge timing means to control the battery status register and the issuance of an RRT signal from the RRT signaling means.