Fast recovery sensor amplifier circuit for implantable medical device
US6411844B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1999 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Oct 19, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/3931
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Therapeutic shocks generated by implantable cardiac stimulators, such as implantable cardioverter-defibrillator devices, may result in residual charges being deposited on the defibrillation electrodes and/or polarization of the tissues surrounding the defibrillation electrodes. These parasitic charges and polarization may mask a possible ventricular fibrillation of the heart following the application of the therapeutic shocks because such a ventricular fibrillation is characterized by intrinsic signals of very small amplitudes. A small duration pulse is applied to the electrodes right after a therapeutic shock. In addition, or alternatively, the electrodes can also be shorted together to dissipate the parasitic charges and the polarization of the tissue. As a result, a ventricular fibrillation can be detected earlier than in previous cardiac stimulators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.