The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 08, 2007
Filed:
Jan. 05, 2004
Willem Wesselink, Doesburg, NL;
Geeske Van Oort, Velp, NL;
Willem Wesselink, Doesburg, NL;
Geeske Van Oort, Velp, NL;
Medtronic, Inc., Minneapolis, MN (US);
Abstract
A system and method for use in an implanted cardiac pacing device, whereby an optimal AV delay is determined at or near lower rate (pacing) limit (LRL) by determining measuring the variance, or instability, of the QT interval for a set of intervals. In one embodiment, asynchronous 'LRL pacing' with a first programmed AV delay determines a measure of QT variance. The difference between the maximum QT and the minimum QT is expressed as QT difference (QTD). For each programmed AV delay the QT variance is again measured and the optimal AV delay produces minimum QTD. In another embodiment, AV delay is modulated around base values for a time. The difference between QT for the modulated AV and for the base AV (dQT) is measured at each base value, and the optimal AV delay corresponds to the smallest dQT.