Retinal Stimulation Apparatus with Variable Pulse Control
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Solution Overview
Problem
Current retinal prosthetic devices face challenges in effectively stimulating the retina to restore vision in individuals with photoreceptor degenerative diseases, as they require precise control over electrical stimulation parameters like frequency, pulse width, and pattern to achieve optimal visual perception.
Innovation Solution
A retinal stimulation apparatus and method that includes an implantable portion with an array of electrodes and an external portion with a camera, RF receiver, and inductive coil, allowing for the generation of impulsive electrical signals and determination of visual perception thresholds through variable current stimuli, enabling precise control over stimulation patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical stimulation parameters (frequency, pulse width, pattern) are precisely controlled to achieve optimal visual perception, then visual perception quality is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic adjustment of stimulation parameters including frequency, pulse width, and pattern of pulse trains based on determined visual perception thresholds. The system adapts stimulation characteristics in real-time to optimize visual perception while managing device complexity through parameter variation rather than structural complexity.
Solution Approach 2:
The invention systematically varies electrical stimulation parameters (frequency, pulse width, pattern) to determine optimal stimulation conditions. By changing these parameters and measuring corresponding visual perception thresholds, the system achieves precise control without requiring overly complex device architecture.
2Reliability
If higher current is used for retinal stimulation, then stimulation effectiveness is improved, but risk of tissue damage increases
Solution Approach 1:
The patent employs periodic pulse trains for retinal stimulation rather than continuous current application. By delivering stimulation in controlled pulses with specific frequencies and durations, the system achieves effective neural activation while minimizing cumulative tissue exposure and potential damage.
Solution Approach 2:
The system maintains continuous visual perception through sustained pulse train delivery, ensuring reliable stimulation effectiveness. The continuous nature of pulse train stimulation allows for persistent visual sensation while the pulsed delivery mechanism inherently limits peak current exposure and tissue stress.
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 allows for improved visual perception by adjusting stimulation parameters, reducing the current required for perception and optimizing the integration of electrical signals, thereby enhancing the effectiveness of retinal stimulation for visual rehabilitation.
Implementation Method 1
an inductive coil, for generating electromagnetic fields to be applied to a patient's retina
Implementation Method 2
an RF receiver, for receiving signals from an external source
Data Source
AI summary
An apparatus and method for retinal stimulation are shown. The method comprises varied parameters, including frequency, pulse width, and pattern of pulse trains to determine a stimulation pattern and visual perception threshold.