Hybrid Optical-Electrical Brainstem Stimulation for Precise Neural Activation
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Solution Overview
Problem
Current methods for stimulating auditory nerve and brain tissue, such as cochlear implants, lack precision and efficacy in generating nerve action potentials, particularly for individuals with damaged or absent auditory nerves, and do not effectively simulate sensory experiences like hearing, balance, or vision.
Innovation Solution
The use of a hybrid optical-electrical stimulation system that applies infrared laser pulses to the auditory brainstem or midbrain, combined with electrical stimulation, to generate nerve action potentials and simulate sensory signals, allowing for more precise and effective stimulation of auditory and other sensory pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical stimulation is used to stimulate auditory nerve and brain tissue, then nerve action potentials can be generated, but the precision and efficacy in generating nerve action potentials is insufficient
Solution Approach 1:
The patent combines optical stimulation (infrared laser pulses) with electrical stimulation to create a hybrid stimulation system. The optical component provides precise spatial targeting to specific nerve pathways, while the electrical component ensures reliable generation of nerve action potentials. This merging of two stimulation modalities resolves the contradiction by achieving both precision (from optical) and reliability (from electrical).
Solution Approach 2:
The patent introduces optical stimulation as an intermediary mechanism that enhances the effectiveness of electrical stimulation. The infrared laser pulses act as a mediator that pre-condition or sensitize the neural tissue, making it more responsive to subsequent electrical stimulation, thereby improving both precision and efficacy of nerve action potential generation.
2Measurement precision
If optical stimulation is used to stimulate nerve pathways, then precision is improved, but thermal tissue damage may occur
Solution Approach 1:
The patent employs pulsed infrared laser stimulation rather than continuous illumination. By delivering energy in periodic pulses with appropriate duty cycles and inter-pulse intervals, the system achieves precise neural stimulation while allowing thermal dissipation between pulses, preventing accumulation of harmful heat in the tissue.
Solution Approach 2:
The patent maintains continuous effective stimulation by using high repetition rate pulses that deliver sufficient energy to elicit neural responses while keeping individual pulse durations short. This allows the useful stimulatory action to be continuous in effect while the actual energy delivery remains discontinuous, preventing thermal damage.
3Reliability
If hybrid optical-electrical stimulation is used, then precision and reliability of nerve action potential generation is improved, but device complexity increases
Solution Approach 1:
The patent designs the hybrid stimulation device to perform multiple functions through integrated components. The same optical fiber delivery system is used for both optical stimulation and as a guide for electrical electrode placement. The control system manages both optical and electrical stimulation modalities, allowing a single device to provide comprehensive neural stimulation with enhanced reliability without proportionally increasing complexity.
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 provides a more precise and reliable generation of nerve action potentials, enabling improved auditory sensations and potentially treating sensory deficiencies by selectively activating specific nerve pathways without causing thermal tissue damage.
Implementation Method 1
The use of a hybrid optical-electrical stimulation system that applies infrared laser pulses to the auditory brainstem or midbrain, combined with electrical stimulation, to generate nerve action potentials
Implementation Method 2
obtaining a plurality of light signals from one or more laser light sources; delivering the plurality of light signals to a plurality of nerve pathways
Data Source
AI summary
Apparatus and method for optical- or optical-and-electrical stimulation of midbrain and/or brainstem tissue (e.g., auditory nerve pathways). Peripheral neural stimulation using infrared lasers has been demonstrated in several systems; however, optical stimulation of the central nervous system (CNS) has not been previously described. In some embodiments of the present invention, radiant energy exposure of the cochlear nucleus using a mid-wavelength infrared laser generates optically-evoked auditory brainstem responses (oABRs). In an experiment, the cochlear nuclei of adult male Sprague-Dawley rats were exposed using a suboccipital craniotomy approach. In one embodiment, different regions of left cochlear nucleus were acutely stimulated with a 200- or 400-micron-diameter optical fiber placed on the surface of the brainstem, using 50- to 750-microsecond pulses of 1849-nm to 1865-nm-wavelength radiation at a rate of 10 to 40 Hz and power levels ranging from 10% to 80% of 5 watts. oABRs were recorded during the period of optical stimulation.