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:
Sep. 05, 2000
Filed:
Apr. 09, 1999
Anne M Street, Sunnyvale, CA (US);
Pacesetter, Inc., Sunnyvale, CA (US);
Abstract
A medical device includes a sensing unit for creating digital data representing the electrical activity of a heart and a controller for, among other things, predicting the onset of an arrhythmia in the heart. From the digital data created by the sensing unit, the controller extracts data that represents the QRS complex of the heart cycle over several cardiac cycles and calculates the power spectrum for each QRS complex. Then, for each QRS complex, the controller calculates the fraction of energy in the power spectrum that falls within one or more frequency bands. The controller than calculates variance of these energy fractions over a number of cardiac cycles. A change, such as a decrease, in the variance presages the onset of an arrhythmia.