Digital circuit for control of gradual turn-on of electrical tissue stimulators
US4520825A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1982 |
| Grant date | Jun 4, 1985 |
| Priority date | — |
| Expiry date | Apr 30, 2002 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/3603
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A circuit for causing the gradual turn-on of electrical tissue stimulation in a digitally controlled stimulator is disclosed. A stimulation pulse counter and a pulses per step memory circuit are connected to a decoder to provide an amplitude incrementing signal after a presettable count of stimulation pulses. An amplitude counter receives the incrementing signal to increment the amplitude of the stimulation output pulse through a digital to analog converter circuit and to reset the pulse counter. A maximum amplitude memory circuit and decoder operate in conjunction with the amplitude counter to latch the counter when a preset pulse amplitude is obtained. At the end of a stimulation interval, the amplitude counter is reset and stimulation pulses begin at the minimum amplitude at the start of the next stimulation interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.