Cochlear implant utilizing multiple-resolution current sources and flexible data encoding

Abstract

A programmable cochlear implant system utilizes multiple-resolution current sources and flexible data-encoding scheme for transcutaneous transmission. In certain embodiments, the number of current sources may be equal to or greater than 2, but equal or less than N−1, where N is the number of electrodes. The multi-resolution current source may introduce offset currents to achieve perceptually-based multiple resolutions with high resolution at low amplitudes and low resolution at high amplitudes. The flexible data-encoding scheme may allow arbitrary waveforms in terms of phase polarity, phase duration, pseudo-analog-waveform, while producing high-rate and high-temporal-precision stimulation. In one embodiment, a 2-current-source system may support simultaneous and non-simultaneous stimulation as well as monopolar, bipolar, pseudo-tripolar, and tripolar electrode configurations.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an implanted auditory prosthesis that utilizes multiple-resolution current sources and a data encoding scheme.BACKGROUND[0002]Cochlear implants are electronic medical device to help deaf or severely-hearing-impaired people. They typically consist of an external signal processor, a transmission coil, an implantable package with a receiver coil, a hermetically sealed circuit, and an electrode array. More particularly, these systems include a microphone to receive sounds and convert them into corresponding electrical signals. These electrical signals may then be processed to generate a series of stimulation pulses that are delivered to the inner ear using a series of implanted electrodes. The stimulation of these implanted electrodes allows the implantee to perceive the corresponding ambient sounds.[0003]A typical cochlear implant includes both an external component and an internal component. The external component will typic...

AI Technical Summary

Benefits of technology

[0007]Other aspects, features, and techniques of the invention will be apparent to one skilled in the relevant art in view of the following detailed description of the invention.

Problems solved by technology

For example, with one current source for all electrodes, the size, complexity, and power consumption of current stimulator are low.

But the stimulation mode is also restricted by the ability of one current source.

However, this results in an increase in the number of current sources in the internal circuit and lowers the stimulation rate (8-bit requires 256 unit current sources and 10-bit requires 1024 unit current sources).

When the stimulation level is close to the most comfortable loudness (MCL) and the value I is large, ΔI / I is usually too small and the resolution space is wasted.

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