R-wave detection method for implantable cardioverter defibrillators
US5709215A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1995 |
| Grant date | Jan 20, 1998 |
| Priority date | — |
| Expiry date | Sep 6, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/3931
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An ICD detection method for sensing the occurrence of an R-wave improves the ability to distinguish R-waves from noise through the use of variable declining sensitivity thresholds. The method includes the consideration of the amplitude of at least the previous most recent R-wave to determine a declining threshold of sensitivity used to recognize a subsequent electrical signal as an R-wave. In the method, the amplitude of the previous R-wave may be classified, based upon amplitude, and based upon the classification, a desirable time constant for the declining threshold of sensitivity is provided as an exponential or reverse exponential decay. Alternatively, a piece wise use of various decay formulas may be combined and used to avoid false recognition of noise as an R-wave.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.