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. 16, 1996
Filed:
Jan. 11, 1995
Stuart W Buchanan, Saugus, CA (US);
Pacesetter, Inc., Sylmar, CA (US);
Abstract
A pacemaker mediated tachycardia (PMT) is detected and suppressed in an implantable pacemaker operating in the VDD or VDDR modality. Such suppression is effectuated by extending the post ventricular atrial refractory period (PVARP) of the pacemaker to an extended PVARP that prevents retrograde P-waves from being tracked, thereby suppressing the PMT. The extended PVARP includes a retrograde window portion, following an absolute refractory portion. P-waves that occur during the retrograde window portion of the extended PVARP are deemed to be retrograde P-waves. The extended PVARP is returned to its original value whenever: (1) a P-wave is sensed following the extended PVARP, which P-wave is deemed to be a sinus P-wave, or (2) whenever a sufficient number of cardiac cycles elapse without the occurrence of a retrograde P-wave.