Reinforced Compliant Cuff for Nerve Stimulation
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Solution Overview
Problem
Existing electrode assembly designs for nerve stimulation and recording face challenges in accommodating dynamic nerve movements and swelling without causing compressive damage or electrical signal attenuation, as they often require a balance between mechanical safety and efficient signal propagation.
Innovation Solution
A reinforced compliant cuff body design that combines a compliant cuff body with reinforcing elements, allowing the cuff to expand and contract with the nerve while maintaining a continuous electrical insulation and preventing mechanical damage, achieved through the use of a compliant cuff body with reinforcing mesh and coatings that provide mechanical strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closed cuff electrode assembly is fitted to match the nerve's original diameter, then electrical insulation and signal transmission are optimized, but compressive damage occurs when the nerve swells or moves
Solution Approach 1:
The cuff body is designed with dynamic compliance to accommodate nerve swelling and movement. The cuff can expand radially when the nerve swells due to inflammation or growth, and can elongate when the nerve moves with body motion, while maintaining continuous electrical insulation and preventing compressive damage through controlled mechanical interaction
Solution Approach 2:
The cuff body utilizes composite material properties combining electrical insulation with controlled mechanical compliance. The material structure allows radial expansion for swelling accommodation while maintaining tensile strength for movement compliance, creating a multi-functional composite that simultaneously provides electrical isolation and mechanical safety
2Object-affected harmful factors
If the cuff is oversized to accommodate nerve swelling, then compressive damage is prevented, but electrical signal transmission is attenuated
Solution Approach 1:
Rather than being statically oversized, the cuff is dynamically sized to match the nerve at different times. During normal conditions, it fits closely for optimal signal transmission. During swelling, it expands to accommodate the increased nerve diameter, maintaining close contact and preventing signal attenuation while avoiding compression
Solution Approach 2:
The cuff's dimensional parameters (radius, circumference) are designed to change in response to nerve swelling. The material and structural design allow the cuff to increase its internal volume dynamically, maintaining close proximity to the nerve surface for efficient electrical coupling while preventing compressive forces
3Object-affected harmful factors
If the cuff is made compliant to accommodate nerve movement, then mechanical safety is improved, but structural strength and durability are reduced
Solution Approach 1:
The cuff employs a flexible shell structure that can bend and deform with nerve movement while maintaining integrity. The thin-film construction allows compliance for mechanical safety but is reinforced to prevent tearing or structural failure during implantation and long-term use
Solution Approach 2:
Composite material construction combines flexible, compliant components with reinforcing elements. The base material provides compliance for nerve movement accommodation, while embedded reinforcements (such as woven fabrics or structural layers) provide tensile strength and durability without significantly reducing compliance
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 accommodates nerve swelling and movement, reducing the risk of compressive damage and signal attenuation, while maintaining efficient electrical signal transmission and mechanical integrity, thus enhancing the safety and performance of electrode assemblies.
Implementation Method 1
The compliant cuff body is made from an elastic material that allows the cuff body to stretch and return to its original shape
Implementation Method 2
The reinforced compliant cuff body includes a compliant cuff body and at least one reinforcing element attached to the compliant cuff body
Data Source
Figure 1A~3B
Figure 4A~4C
Figure 5A~5C
AI summary
An electrode assembly is described, which allows close and robust contact with a biological structure such as a nerve while simultaneously preventing compressive injury to the biological structure. The electrode assembly includes a compliant cuff body and at least one reinforcing element in an aspect. The reinforced compliant cuff body may expand and contract to accommodate swelling of underlying biological structures, to accommodate movements of the biological structures associated with body movements, and to closely fit biological structures with irregular or non-uniform cross-sectional profiles. The electrode assembly further includes at least one electrode for sending and/or receiving electric impulse data to/from the biological structure such as a nerve.