Stimulating Assembly With Polymer Skirts for Focused Nerve Stimulation
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Solution Overview
Problem
Existing medical devices face challenges in efficiently delivering targeted electrical stimulation to nerve cells while minimizing tissue trauma and current leakage, particularly in implantable devices like cochlear implants.
Innovation Solution
A stimulating assembly featuring an electrically insulating carrier member with an array of electrode structures, each comprising an electrode contact, an electrically conductive polymer pad, and an insulating polymer skirt that surrounds the pad, which enhances adhesion and seals against the body tissue, focusing current flow to targeted nerve cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electrodes are used for electrical stimulation, then current can be delivered to nerve cells, but current leakage and tissue trauma occur
Solution Approach 1:
The electrode structure incorporates an insulating polymer skirt that selectively insulates only the lateral sides of the conductive pad while leaving the distal end exposed. This localized insulation approach allows current to be delivered efficiently to the target nerve cells at the distal end while preventing current leakage through the lateral sides, thereby reducing tissue trauma without compromising stimulation effectiveness
Solution Approach 2:
The electrode structure combines multiple materials with different properties: an electrically conductive polymer pad for current delivery, an electrically insulating polymer skirt for preventing current leakage, and a carrier member for structural support. This composite material approach enables simultaneous achievement of effective current delivery and current leakage prevention, resolving the contradiction between stimulation efficiency and tissue protection
2Object-affected harmful factors
If larger electrode surface area is used to reduce current density, then tissue trauma is reduced, but current leakage increases
Solution Approach 1:
The insulating polymer skirt is applied selectively to the lateral sides of the conductive pad rather than covering the entire electrode surface. This localized insulation maintains a relatively large pad surface area for reducing current density and tissue trauma, while the skirt prevents current leakage through the lateral edges where it would otherwise occur
Solution Approach 2:
The electrode structure is segmented into distinct functional zones: an exposed distal end for current delivery to nerve cells, insulated lateral sides for preventing current leakage, and a connection region to the carrier member. This segmentation allows each zone to perform its specific function optimally, achieving both reduced tissue trauma and minimized current leakage
3Measurement precision
If multiple electrode structures are used for precise stimulation, then targeting accuracy is improved, but device complexity increases
Solution Approach 1:
The device uses multiple discrete electrode structures, each with its own insulating polymer skirt, arranged in an array along the carrier member. This segmentation into multiple independent electrode units enables precise targeting of different nerve cell groups while maintaining a relatively simple overall structure through modular repetition of the basic electrode-skirt-carrier unit
Solution Approach 2:
Each electrode structure in the array incorporates the insulating polymer skirt to provide localized current confinement, ensuring that each electrode delivers current precisely to its intended target region without lateral leakage. This localized insulation at each electrode position simplifies the design compared to requiring complex inter-electrode insulation structures
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 assembly provides precise and efficient electrical stimulation with reduced current leakage and tissue trauma, enhancing the effectiveness and longevity of the implant by minimizing energy requirements and improving surgical atrauma.
Implementation Method 1
an electrically conductive polymer pad disposed on the electrode contact
Implementation Method 2
an electrically insulating polymer skirt at least partially surrounding the electrically conductive polymer pad
Data Source
AI summary
Presented herein are medical devices that include a stimulating assembly to deliver electrical stimulation to a recipient. More specifically, a stimulating assembly comprises an electrically insulating carrier member and at least one electrode structure coupled to the carrier member. The electrode structure comprises an electrode contact, an electrically conductive polymer pad, and an electrically insulating polymer at least one electrically insulating polymer skirt at least partially surrounding the electrically conductive polymer pad.