Title:
TACHYARRHYTHMIA DETECTION AND DISCRIMINATION BASED ON CURVATURE PARAMETERS
Document Type and Number:
WIPO Patent Application WO2005002669
Kind Code:
A3
Abstract:
Estimating a frequency of a sampled cardiac rhythm signal and classifying the rhythm. The received signal is sampled and transformed into a curvature series. A lobe in the curvature series corresponds to a characteristic point in the sampled series. Characteristic points are selected based on a time of a lobe in the curvature series and, in one embodiment, an amplitude of the signal at the time of the lobe. A frequency of the sampled series is estimated by autocorrelating a function of the series of the characteristic points. In one embodiment, the function is a time difference function. The rhythm is classified by plotting the timewise proximity of characteristic points derived from an atrial signal with characteristic points derived from a ventricular signal. Regions of the plot are associated with a particular rhythm and the grouping of the data corresponds to the classification.
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Inventors:
SWEENEY ROBERT J (US)
RICCI CARLOS (US)
RICCI CARLOS (US)
Application Number:
PCT/US2004/020723
Publication Date:
May 12, 2005
Filing Date:
June 28, 2004
Export Citation:
Assignee:
CARDIAC PACEMAKERS INC (US)
SWEENEY ROBERT J (US)
RICCI CARLOS (US)
SWEENEY ROBERT J (US)
RICCI CARLOS (US)
International Classes:
G06K9/00; A61B5/0245; A61B5/361; A61B5/363; A61N1/362; A61N1/39; (IPC1-7): A61N1/362; A61B5/0452; G06F17/00
Domestic Patent References:
| WO2002040094A2 | 2002-05-23 |
Foreign References:
| US5193550A | 1993-03-16 | |||
| US5365934A | 1994-11-22 | |||
| US6024705A | 2000-02-15 | |||
| US6275732B1 | 2001-08-14 | |||
| US20020193696A1 | 2002-12-19 |
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