초록 ▼

A programmable pacing system and method, the system having the capability for providing an indication of recommended replacement time (RRT) as well as a prior warning of six months to RRT. RRT is determined by storing a value in the pacemaker corresponding to battery impedance at RRT, continuously p

A programmable pacing system and method, the system having the capability for providing an indication of recommended replacement time (RRT) as well as a prior warning of six months to RRT. RRT is determined by storing a value in the pacemaker corresponding to battery impedance at RRT, continuously periodically measuring battery impedance, and comparing the measured value with the stored RRT value. Whenever the pacemaker is reprogrammed to different operating conditions which affect RRT, or there is a significant change in load lead resistance, a new value of RRT impedance is calculated based upon a selected formula corresponding to the reprogrammed set of operating conditions, and stored in the pacemaker. At the same time, an Aging value of impedance is re-calculated to provide a six month warning before RRT, and likewise stored in the pacemaker.

대표청구항 ▼

A programmable implantable pacemaker, said pacemaker having a battery which provides energy to said pacemaker, said battery having at least one parameter which changes with cumulative expenditure of energy to said pacemaker, a controllable pulse generator for generating pace pulses, and programming

A programmable implantable pacemaker, said pacemaker having a battery which provides energy to said pacemaker, said battery having at least one parameter which changes with cumulative expenditure of energy to said pacemaker, a controllable pulse generator for generating pace pulses, and programming means for programming said pacemaker to operate under a programmed set of operating conditions, said pacemaker further comprising: measuring means for obtaining an actual measure of the actual value of said battery parameter; means tier storing a reference measure of said battery parameter which is representative of a cumulative battery expenditure which correlates to desired pacemaker replacement at a time when said pacemaker still has at least a predetermined remaining time of operation; calculating means for calculating said reference measure to provide a calculated value of said reference measure when said operating conditions are changed by said programming means, said calculating being a function of said changed conditions, and including determining that said calculated value corresponds to when said pacemaker still has at least said predetermined remaining time of operation, and for storing said calculated value as said reference measure: and comparison means for automatically comparing said actual measure with said reference measure and providing a replacement time indication as a function of said comparison.