System and method for rejecting far-field signals using an implantable cardiac stimulation device
US7139611B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 2003 |
| Grant date | Nov 21, 2006 |
| Priority date | — |
| Expiry date | Sep 13, 2024 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N2001/0585
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A technique is provided for filtering far-field electrical cardiac signals from near-field signals. Atrial tip and ring signals are sensed using unipolar electrodes and any timing differences between corresponding events within the signals are detected. Then, far-field signals are filtered from the tip and ring signals based on the detected timing differences, such that substantially only near-field atrial signals remain. The technique exploits the fact that near-field atrial signals are sensed when a conduction wave passes by the atrial electrodes. In contrast, far-field signals from the ventricles propagate to the atrium at near the speed of light. Hence, any significant timing difference between corresponding events appearing in the atrial signals is indicative of a near-field event, whereas the lack of a significant timing difference is indicative of a far-field event. In one example, a sense amplifier is provided with a Boolean logic circuit to aid in time delay-based filtering.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.