Cochlear Implant Channel Conditioning via Desensitization
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Solution Overview
Problem
Cochlear implants face significant spatial channel interaction due to geometric overlapping of electrical fields, leading to channel crosstalk that hampers precise audio information transmission and increases power consumption.
Innovation Solution
The method involves using sensitization and desensitization periods to condition channels before delivering stimulation signals, minimizing cross-talk by applying desensitization signals on adjacent channels and blanking the stimulation channel before data signal delivery, which enhances signal clarity and reduces power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple stimulation electrodes are activated simultaneously to provide comprehensive auditory stimulation, then the coverage of auditory frequency bands is improved, but spatial channel interaction and channel crosstalk increase
Solution Approach 1:
The patent applies preliminary action by implementing desensitization periods before stimulus delivery. During these periods, electrodes are selectively stimulated with desensitization pulses that reduce the excitability of neurons in adjacent channels, thereby minimizing channel crosstalk when multiple channels are activated simultaneously for comprehensive auditory stimulation.
Solution Approach 2:
The patent applies preliminary anti-action by using desensitization pulses with specific characteristics (lower amplitude, different frequency) that counteract the potential harmful effects of channel interaction before the main stimulus is delivered. This preliminary counter-stimulation reduces the geometric overlapping effects of electrical fields between multiple activated electrodes.
2Object-generated harmful factors
If focused electrical field stimulation is applied to reduce spatial interaction, then channel crosstalk is reduced, but electrical power consumption increases
Solution Approach 1:
The patent applies periodic action by implementing desensitization periods interspersed with stimulus delivery periods. Rather than continuously applying high-energy focused stimulation, the system periodically activates desensitization pulses at specific intervals before data stimulation, reducing overall power consumption while maintaining channel separation benefits.
Solution Approach 2:
The patent applies partial action by using desensitization pulses with lower amplitude than the main stimulus pulses. Instead of applying full-strength focused stimulation continuously, the system uses partial-strength desensitization pulses selectively during specific periods, achieving sufficient channel separation with reduced energy expenditure.
3Object-generated harmful factors
If desensitization periods are implemented before stimulus delivery, then channel cross-talk is minimized, but the time required for signal processing increases
Solution Approach 1:
The patent applies partial action by implementing desensitization periods of optimized duration that are sufficient to achieve channel separation but not excessively long. The desensitization pulses are applied for a limited period before stimulus delivery, balancing the reduction of channel cross-talk with minimal impact on overall signal processing time.
Solution Approach 2:
The patent applies preliminary action by performing desensitization stimulation in advance before the main stimulus delivery. This preliminary conditioning of the neural tissue allows for reduced channel interaction during subsequent stimulus delivery, with the desensitization period being timed to optimize the balance between cross-talk reduction and processing time.
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
This approach effectively minimizes channel cross-talk, improves signal clarity, and reduces power consumption by using low-energy desensitization pulses, allowing for more precise audio information transmission with lower electrical power usage.
Implementation Method 1
The method is based on the neural adaptation phenomenon, wherein the response of a neuron to a stimulus is modified by prior stimulation history. Specifically, the invention utilizes desensitization periods wherein stimulation of a given channel is prevented for a period of time prior to stimulus delivery, thereby enhancing the response to subsequent stimulus delivery.
Implementation Method 2
Two conditioning modes are used: a sensitization mode is applied on the stimulation channel and emphasizes the succeeding stimulation signal, and a desensitization mode attenuates cross-talk signals on channels which are spatially adjacent to the stimulus channel.
Data Source
AI summary
A method is described for delivering stimulation signals in an implantable multichannel neuro-stimulating device such as a cochlear implant. A stimulation channel is selected for delivering a data stimulation signal. One or more desensitization channels spatially adjacent to the stimulation channel are also selected. One or more non-data desensitization signals are delivered on the desensitization channels during a desensitization period before delivery of the data stimulation signal, and then the data stimulation signal is delivered on the stimulation channel. The stimulation channel may be blanked to prevent stimulation signals during a sensitization period before delivering the data stimulation signal.