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:
Apr. 10, 2001
Filed:
Jan. 29, 1999
Geeske Van Oort, Nieuwleusen, NL;
Medtronic Inc,, Minneapolis, MN (US);
Abstract
There is provided a system and method for determining, in a DDD or DDD(R) pacing system, when a delivered atrial pace pulse has failed to capture the patient's atrium. Each cycle, following a delivered ventricular pace pulse, or every N cycles a measure of change in QT interval is obtained and compared to stored criteria. When an atrial pulse has achieved capture, the difference in QT from the last beat will be small, normally less than 2 ms. However, if there has not been atrial capture, the delivered ventricular pace pulse is in fact asynchronous with respect to the atrium, and under these circumstances the change in QT is greater than 2 ms, e.g., in the range of 2-10 ms. Accordingly, when the pacemaker sees a change in QT within the 2-10 ms range, this indicates failure of capture, and responsive action is taken by either directly incrementing the energy level of the atrial pace pulses, or performing an atrial threshold search and then resetting the atrial pace energy level.