Pacemaker with activity-dependent rate limiting
US4945909A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 6, 1989 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | Jun 6, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/36585
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A pacemaker is disclosed with a pacing rate that is restricted within a range defined by variable upper and lower rate limits that change as a function of the patient's detected level of activity. An indication such as the nonambient temperature of blood is sensed in the right ventricle of the heart to indicate detected activity level. Other activity indications, such as blood oxygen concentration and body motion, either singly or in combination are also disclosed. A control circuit of the pacemaker varies the upper and lower rate limits according to the patient's detected level of activity. The control circuit also varies the atrial and ventricular refractory periods along with the AV delay period in response to detected activity level changes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.