Multi-mode microprocessor-based programmable cardiac pacer
US4485818A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1980 |
| Grant date | Dec 4, 1984 |
| Priority date | — |
| Expiry date | Nov 14, 2000 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/37235
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An implantable, microprocessor-based cardiac pacer provides physiologically adaptive pacing in four fundamental modes: ventricular-inhibited; atrial-synchronized ventricular with or without ventricular sensing; and atrial-ventricular (AV) sequential. In the AV sequential mode, the pacer automatically shifts to atrial synchronous ventricular pacing when the atrial rate exceeds the programmed minimum rate. Temporary pacing modes are available for treatment of arrhythmia and either atrial or ventricular overdrive pacing via chest wall stimulation. The pacer continuously monitors tachyarrhythmia and automatically enters and exits a special arrhythmia response mode. Eight parameters can be altered one at a time or reprogrammed to a standard set in a single programming step using pre-existing magnetic programmers. A weak battery is signified by substituting a lower frequency voltage-sensitive backup oscillator and by dropping the atrial beat in the magnet rate. Sense amplifier blanking is executed in software while rate limit is executed in both software and separate hardware circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.