Defibrillation/cardioversion system with multiple evaluation of heart condition prior to shock delivery
US5179945A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 1991 |
| Grant date | Jan 19, 1993 |
| Priority date | — |
| Expiry date | Jan 17, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/3987
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An automatic implantable defibrillator/cardioverter having a non-committed defibrillation/cardioversion algorithm. The defibrillator/cardioverter includes an ECG amplifier with automatic gain control (AGC) which detects the electrical activity of the heart for analysis by a cardiac condition detector. Logic is provided which receives input from the ECG amplifier and the cardiac condition detector for analyzing the heart activity. The non-committed defibrillation algorithm sensing begins upon the determination of an arrhythmia. The capacitor is charged while the heart activity is simultaneously monitored. After the capacitor is charged, a check is made on the duration of the last detected R-R interval while so charging the capacitor, and a comparison is made between this R-R interval and a preset value. If the last R-R interval is greater than the preset value, a non-committing period is entered which lasts approximately 2 seconds. The purpose of the non-committing period is to allow detection to monitor the arrhythmia further before making the decision to discharge the capacitor or dump the charge internally. If any R-R interval detected during this interval is less than PCLL, this…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.