Multi-channel implantable neural stimulator
US4592359A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 2, 1985 |
| Grant date | Jun 3, 1986 |
| Priority date | — |
| Expiry date | Apr 2, 2005 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/36038
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A combination of a transmitter and implantable receiver are disclosed wherein data is conveyed from transmitter to receiver utilizing a data format in which each channel to be stimulated is adapted to convey information in monopolar, bipolar or analog form. The data format includes two types of code words: transition words in which one bit is assigned to each channel and can be used to create monopolar pulsatile or bipolar pulsatile waveforms; and amplitude words which can create analog waveforms one channel at a time. An essential element of the output system is a current source digital to analog converter which responds to the code words to form the appropriate output on each channel. Each output is composed of a set of eight current sources, four with one polarity of current and the other four with the opposite polarity of current. In each group of four, the current sources are binarily related, I, 2I, 4I and 8I. In this arrangement each channel can supply 16 amplitudes times two polarities of current; meaning 32 current levels. This channel is simply a 5-bit digit to analog converter. The output circuitry contains charge balance switches. These switches are designed to recover …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.