Pacemaker adapted to prefer underlying sinus rhythm over other rate responsive indicator
US5674257A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1996 |
| Grant date | Oct 7, 1997 |
| Priority date | — |
| Expiry date | Mar 5, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/36585
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A dual chamber, rate-responsive pacemaker for pacing a patient's heart novelly allows tracking of the patient's sinus rate when the sinus rate is slightly less than the sensor rate; i.e., within a predetermined "Sinus Preference Window Maximum Rate Drop." Pacing at the sensor rate occurs when the sensor rate exceeds the sinus rate by more than the Sinus Preference Window Maximum Rate Drop. In the preferred embodiment a Sinus Preference Window, which occurs at the end of the ventricle-to-atrium interval, is decremented with successive heart beats by a programmable delta to increase the pacing rate until the Sinus Preference Window reaches zero, in which case the pacemaker paces at the sensor rate. The Sinus Preference Window is reset to its maximum value upon either the detection of an atrial sensed event, or upon the expiration of a programmable Sinus Check Interval. The pacemaker paces at the sinus rate or the maximum rate drop rate, whichever is faster, for a number of recovery beats, and then increments the pacing rate up to the sensor rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.