LACE Cuff Electrode Enzymatic Epineurium Disruption
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Solution Overview
Problem
Current peripheral nerve interfaces, whether extraneural or intrafascicular/intraneural, face challenges in achieving chronic stability and fascicular selectivity, particularly with non-invasive cuff electrodes, which struggle to access individual fascicles effectively due to the epineurium barrier and risk nerve damage with invasive methods.
Innovation Solution
The Lyse-and-Attract Cuff Electrode (LACE) approach involves locally disrupting the epineurium and perineurium with collagen-lysing agents and using neurotrophic factors to induce collateral axonal sprouting into microchannels, allowing for targeted fascicular access without invasive reshaping or penetration, combining microfluidics with microelectronics for stable and specific nerve interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If extraneural cuff electrodes are used to avoid nerve damage, then nerve safety is improved, but access to individual fascicles and signal-to-noise ratio deteriorates
Solution Approach 1:
The patent applies preliminary action by delivering collagen-lysing agents through microchannels before electrode recording/stimulation occurs. This enzymatic treatment temporarily disrupts the epineurium and perineurium to create microchannels, enabling subsequent direct access to fascicles without permanent nerve damage. The preliminary chemical preparation resolves the contradiction by temporarily modifying tissue structure to enable high-fidelity recording while maintaining overall nerve integrity.
Solution Approach 2:
The patent uses collagen-lysing agents as intermediaries to facilitate fascicular access. These enzymes act as mediators that temporarily modify the epineurial and perineurial barriers, creating pathways for electrode contact with individual fascicles. The intermediary chemical treatment enables the electrode to achieve intraneural-level access while the electrode itself remains extraneural, thus maintaining nerve safety while improving signal quality.
2Measurement precision
If invasive intrafascicular electrodes are used to access individual fascicles, then fascicular selectivity is improved, but nerve damage and chronic tissue response worsen
Solution Approach 1:
The patent replaces mechanical penetration methods with enzymatic chemical treatment. Instead of physically inserting electrodes through the epineurium and perineurium (mechanical system), the invention uses collagen-lysing agents delivered through microchannels to chemically modify and temporarily disrupt these barriers. This substitution of mechanical invasion with chemical facilitation achieves fascicular access while minimizing nerve damage and chronic tissue response.
Solution Approach 2:
The patent changes the physical-chemical parameters of the epineurium and perineurium by applying collagen-lysing agents that temporarily alter tissue structure and permeability. This parameter change creates transient microchannels that enable fascicular access without permanent structural modification. The temporary nature of this parameter change allows high fascicular selectivity while avoiding the chronic damage associated with permanent mechanical insertion.
3Measurement precision
If nerve reshaping by flattening is used to improve fascicular access, then access to individual fascicles is improved, but nerve damage and signal-to-noise ratio restriction worsen
Solution Approach 1:
The patent extracts or removes the barrier function of the epineurium and perineurium through enzymatic treatment, rather than mechanically flattening the nerve. By taking out the protective sheath's barrier properties locally through collagen degradation, the invention enables direct fascicular access without the mechanical stress and damage caused by nerve flattening procedures.
4Object-affected harmful factors
If traditional cuff electrodes are used to maintain non-invasiveness, then nerve safety is improved, but chronic recording stability deteriorates
Solution Approach 1:
The patent applies preliminary enzymatic treatment to create stable microchannels in the epineurium and perineurium before electrode implantation. This preliminary action of collagen degradation establishes permanent or long-lasting pathways that enable stable electrode-fascicle interfaces. The preliminary modification of tissue structure ensures chronic recording stability while the electrode itself remains extraneural, maintaining nerve safety.
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 method enables a chronically stable, high signal-to-noise ratio recording interface that is non-invasive, achieving fascicular selectivity and stability without damaging the nerve, improving upon existing technologies by using enzymatic removal of collagen fibers and neurotrophic factors to guide axonal sprouting towards microchannel electrodes.
Implementation Method 1
locally disrupting the epineurium and perineurium (these protective sheaths are primarily composed of collagen) with a collagen-lysing agent
Implementation Method 2
enzymatic removal of collagen fibers
Implementation Method 3
using neurotrophic factors to induce collateral axonal sprouting into microchannels
Data Source
AI summary
A new class of peripheral nerve interfaces that combines microfluidics with microelectronics. A peripheral nerve interface that allows intraneural targeting through the combined use and sequential application of lysing agents and neurotrophic factors.