초록 ▼

A system within an implantable stimulation device and a method for limiting the extent to which any high power consumption modes, such as a rate response mode, can be utilized during low battery periods. A battery threshold detector is utilized to detect when the battery is below a predetermined thr

A system within an implantable stimulation device and a method for limiting the extent to which any high power consumption modes, such as a rate response mode, can be utilized during low battery periods. A battery threshold detector is utilized to detect when the battery is below a predetermined threshold. The implantable stimulation device then switches from a high current drain mode of operation to progressively lower current drain modes of operation. This configuration allows a significant reduction in current drain at RRT and further prevents the output amplitude from dropping below the capture level and prevents the remaining battery capacity from being rapidly used up.

대표청구항 ▼

An implantable pacemaker, comprising: a battery having a battery voltage which is dependent on current drain from the battery; a battery voltage threshold detector for detecting when the battery voltage drops at least to a first predetermined voltage; a pulse generator for generating stimulation pul

An implantable pacemaker, comprising: a battery having a battery voltage which is dependent on current drain from the battery; a battery voltage threshold detector for detecting when the battery voltage drops at least to a first predetermined voltage; a pulse generator for generating stimulation pulses to a patient\s heart, the pulse generator including means to generate constant amplitude stimulation pulses for a time period corresponding to the battery voltage being above the first predetermined voltage, the pulse generator further having means to operate in a plurality of modes of operation; means for programming a plurality of parameters which control the pulse generator, the plurality of parameters including a first parameter corresponding to stimulation pulse amplitude and a second parameter which controls the pulse generator in a desired mode of operation, the second parameter having a plurality of values corresponding to a plurality of current drain levels; and means for adjusting the second parameter to a value corresponding to a lower level of current drain when the battery voltage threshold detector detects that the battery voltage is below the first predetermined voltage.