Cochlear Implant Electrode State Control for Focused Stimulation
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Solution Overview
Problem
Cochlear implant systems face issues with electrical fields spreading widely in the cochlea, leading to broad and unfocused excitations of auditory nerve fibers, which deteriorate sound or speech recognition performance.
Innovation Solution
A hearing device with a cochlear implant system that includes an input portion to convert acoustic signals into electrical signals, a processing portion to conduct an active grounding procedure, and an implant portion with operation electrodes that can be set into high impedance, grounded, or stimulating states to control the spread of electrical excitations, using specific electrode state setting patterns to focus or steer the current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical field is generated during activation of any electrode, then auditory nerve fibers can be excited, but the electrical field spreads widely into the cochlea causing broad and unfocused excitations that deteriorate sound or speech recognition performance
Solution Approach 1:
The patent segments the electrical field distribution by selectively grounding specific electrodes adjacent to the stimulated electrode. This creates distinct zones of current flow confinement, where each stimulated electrode has its own dedicated return path through adjacent grounded electrodes, thereby segmenting the overall electrical field into focused local regions rather than allowing widespread diffusion throughout the cochlea.
Solution Approach 2:
The patent applies local quality by creating different electrical field characteristics in different spatial locations. The grounded electrodes adjacent to the stimulated electrode create a localized region of focused current flow, while other regions of the cochlea maintain different electrical properties. This local differentiation ensures that stimulation is concentrated where needed while minimizing spread to adjacent areas.
2Adaptability or versatility
If multiple electrodes are activated to cover different frequency ranges, then hearing capability can be improved, but the spread of electrical fields increases causing interference and reduced recognition performance
Solution Approach 1:
The patent segments the cochlear implant system into independent electrode groups, where each electrode can be stimulated with its own dedicated return path through adjacent grounded electrodes. This segmentation allows multiple frequency ranges to be activated simultaneously or sequentially without electrical field interference, as each stimulation channel is electrically isolated from others through the selective grounding configuration.
Solution Approach 2:
The grounded electrodes serve as intermediaries that mediate the electrical field between stimulated electrodes and the cochlear fluid. By positioning grounded electrodes adjacent to stimulated electrodes, they act as controlled return paths that guide current flow locally, preventing electrical fields from one stimulated electrode from interfering with adjacent stimulated electrodes, thus enabling multi-frequency operation without interference.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves sound recognition by focusing or steering the electrical excitations within the cochlea, reducing unnecessary neural activation and enhancing the spatial selectivity of stimulation, thereby improving hearing capabilities.
Implementation Method 1
an input portion configured to receive, as a stimulus, an acoustic signal, to convert the acoustic signal into an electrical acoustic signal
Implementation Method 2
the processing portion comprises an electrode state setting section configured to set the plurality of operation electrodes into one of a high impedance state, a grounded state and a stimulating state in which a signal based on the electric acoustic signal is supplied
Data Source
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AI summary
A hearing device for use with a cochlear implant system is disclosed. An input portion receives, as a stimulus, an acoustic signal, converts the acoustic signal into an electrical acoustic signal and provides the electrical acoustic signal. A processing portion processes the electrical acoustic signal and conducts an active grounding procedure. An implant portion being implantable at least partially in a cochlea of the user comprises a plurality of operation electrodes and a reference electrode, e.g. an external electrode being grounded and implantable outside of the cochlea of the user. The operation electrodes are driven by the processing portion on the basis of the electric acoustic signal. An electrode state setting section sets the plurality of operation electrodes into one of a high impedance state, a grounded state and a stimulating state in which a signal based on the electric acoustic signal is supplied a stimulation electrode of the plurality of operation electrodes. An electrode state setting pattern determining section selects, according to an operation mode of the cochlear implant system, one of a plurality of electrode state setting patterns, wherein each of the electrode state setting patterns is adapted to enable a stimulation by a stimulation electrode of the plurality of operation electrodes being in a stimulating state and at least one of the plurality of operation electrodes being in a grounded state or in a high impedance state. The electrode state setting section sets the plurality of operation electrodes into the specified electrode state according to the selected electrode state setting pattern.