Retinal Implant Electrode Segmentation for Visual Acuity
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Solution Overview
Problem
Existing vision augmentation systems, such as the Argus II Retinal Prosthesis System, face challenges including complexity, size, and difficulty in providing sufficient signal resolution to allow patients to effectively 'see'. Additionally, these systems aim to artificially replicate vision rather than addressing the underlying decline in retinal cell function.
Innovation Solution
The proposed solution involves an implantable device with electrodes, a control circuit, and an antenna or coil for receiving electromagnetic signals. This device is designed for placement near target tissue in the eye to provide stimulus that supports healing or preservation of light-responsive cells, potentially avoiding the need to replicate visual signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrodes are placed on or in the fovea to selectively stimulate biological tissue in a spatial manner, then visual acuity is improved, but device complexity and size increase
Solution Approach 1:
The retinal implant is divided into multiple independently controllable electrode segments or groups, each capable of being stimulated separately. This segmentation allows for spatially selective stimulation of different retinal regions to improve visual acuity while managing device complexity through modular control architecture
Solution Approach 2:
Different regions of the retinal implant are designed with varying electrode densities and stimulation parameters tailored to specific functional requirements. The foveal region receives higher density stimulation for acuity, while peripheral regions use lower density, optimizing visual performance without uniformly increasing device complexity across the entire implant
2Measurement precision
If electrodes are placed on or in the fovea to selectively stimulate biological tissue, then signal resolution is improved, but device size increases
Solution Approach 1:
The retinal implant adopts a nested or folded configuration where electrode arrays are arranged in compact, space-efficient geometries. Multiple electrode layers or patterns are stacked or folded within a small volume, enabling high signal resolution through dense electrode placement without proportionally increasing overall device size
Solution Approach 2:
The electrode array transitions from a two-dimensional planar arrangement to a three-dimensional configuration, utilizing vertical stacking, folded patterns, or curved surfaces to pack more electrodes into a smaller volume, thereby improving signal resolution without linearly increasing device footprint
3Reliability
If visual signals are artificially replicated through electrical stimulation, then vision is restored, but system complexity increases
Solution Approach 1:
The retinal implant leverages the eye's own optical system (lens, cornea, media) to deliver light directly to the retinal tissue, eliminating the need for complex external imaging optics and signal processing systems. The natural eye structures perform the function of focusing and delivering visual information, simplifying the overall system architecture while maintaining vision restoration capability
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 effectively addresses the decline in retinal cell function by providing electrical stimulation that can halt or reverse the progression of eye diseases such as macular degeneration, thereby improving vision without the complexity of replicating visual signals.
Implementation Method 1
an antenna or coil for receiving electromagnetic signals
Data Source
AI summary
Implantable medical devices for use in or on the eye. An implantable device may have at least one electrode thereon for issuing therapy, such as via electrical current or voltage, while implanted in or on the eye, for the treatment of one or more of macular degeneration, glaucoma, presbyopia, or other condition or disease of the eye. The implantable device may comprise a transducer for receiving power from an external device that may be worn on the patient using any of optical, inductive, mechanical or radiated energy. An example includes an implantable device for placement on the retina which has a gap or opening to place electrodes near the maculae without covering the fovea. Other examples may target other portions of the eye anatomy.