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:
Jan. 12, 1999
Filed:
Aug. 08, 1996
Stephanie A Caswell, Ann Arbor, MI (US);
Janice M Jenkins, Ann Arbor, MI (US);
Lorenzo A DiCarlo, Ann Arbor, MI (US);
The Regents of the University of Michigan, Ann Arbor, MI (US);
Abstract
A method and appartus for differentiating between ventricular tachycardia and ventricular fibrillation includes a pair of electrodes located on a single catheter which, in conjunction with an implantable cardioverter device, utilize two channel ventricular algorithms for ventricular tachycardia and ventricular fibrillation separation. Two closely spaced unipolar electrograms demonstrate similar morphology and consistency during rhythms with broad coherent activation (such as sinus rhythm and ventricular tachycardia). Conversely, for incoherent rhythms (ventricular fibrillation and polymorphic ventricular tachycardia), activation between the electrodes proved to be dissimilar and inconsistent. The cross-correlation of the two depolarizations measures similarity between electrogram morphology, and interquartile range measures consistency in a passage. The method and apparatus of the present invention is able to address the limitation of existing algorithms and provide accurate separation of ventricular fibrillation from other rhythms.