发明名称 |
Pacemaker which adapts to minimize current drain and provide desired capture safety margin |
摘要 |
A cardiac pacemaker improves battery longevity by automatically providing a safe threshold and an associated pulse width leading to minimum current drain. The pacemaker stores a matrix of current drain characteristics for all of the possible pulse width-voltage pairs, and a revisable strength-duration curve for a patient. Either periodically or as a result of a loss-of-capture episode-whichever occurs first-the pacemaker calculates for each possible pulse width, a new threshold value based upon a measured rheobase and a derived chronaxie. Each threshold is multiplied by a predetermined safety margin. The pacemaker chooses as the pacing stimulation signal, the voltage-pulse width pair having the lowest associated current drain, and satisfying the desired safety margin.
|
申请公布号 |
US5447525(A) |
申请公布日期 |
1995.09.05 |
申请号 |
US19930122258 |
申请日期 |
1993.09.15 |
申请人 |
MEDTRONIC, INC. |
发明人 |
POWELL, RICHARD M.;JENSEN, STEVEN L. |
分类号 |
A61N1/37;(IPC1-7):A61N1/365 |
主分类号 |
A61N1/37 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|