Fault tolerant elective replacement indication for implantable medical device

摘要

Pacemaker has fault-tolerant constituent replacement indicator (ERI) trigger method, and wherein the parameter of instantaneous offsets is used as criteria triggers ERI and is rejected as trigger event. Periodically assessment battery depletion is certain labels, and transient excursion label will be reduced by long-term low-pass filtering operation, these are due to non-ERI conditions. The label of concern of (such as one day) critical value must be over pre-determined number for a long time, so that the equipment issues ERI. In a disclosed embodiment, the internal impedance load terminal voltage of battery and the consumption degree as indicator battery. Periodically, these values are to measure and convert thereof into digital value. The digital value is subjected to low-pass filtering operation to prevent interim or transient excursion voltage curve impedance and from causing ERI to be triggered. In another disclosed embodiment, the long-term fading periodically measured values that are averaged are kept. When measured value is found to meet ERI standards, assesses parameter of interest and carry out increased rate. Simultaneously assessment be executed at rate raising, decay must continuously updated average value meet ERI trigger criterias at least pre-determined number ERI before be triggered. If decline is average not to be able to satisfy number required for ERI trigger criterias, assessment restarts first, slow periodic rate.