Body tissue stimulation apparatus with warning device
US4140131A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1976 |
| Grant date | Feb 20, 1979 |
| Priority date | — |
| Expiry date | Nov 3, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/3706
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Apparatus for stimulating body tissue and in particular the heart, is disclosed as including a device or circuit responsive to the initiation of stimulation and/or to the failure or pending failure of a component of the stimulating apparatus to provide the patient with a perceivable stimulation to a second, different portion of body tissue. There is disclosed an impedance level detector for sensing the impedance presented between the outputs of the stimulation apparatus to provide a warning signal indicating that the output impedance falls outside a predetermined range. In particular, the impedance level detector output is sensed by a stimulation control logic to apply a first train of pulses at a first rate to an auxiliary electrode for stimulating the second portion of tissue. Further, there is included a voltage level detector for sensing when the power source voltage depletes below a predetermined level, to actuate the stimulation control logic to provide a second train of warning pulses to the auxiliary electrode, at a second, different rate than that of the first train. In this fashion, the patient not only is warned as to the pending failure or failure of a component of his …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.