Resonant Sub-threshold Stimuli for Nerve Conduction Stability
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Solution Overview
Problem
Existing methods for functional electrical stimulation (FES) face challenges in stabilizing excitation wave propagation in nerve tissue with impaired conductivity, often leading to conduction blocks and instability, which can disrupt muscle contraction and paralysis treatment.
Innovation Solution
A method involving concurrent stimulation with a primary and secondary electrical stimulus at different frequencies, where the secondary stimulus has a lower amplitude and is applied spatially distributed across the tissue to enhance action potential propagation, using a system with a primary electrode and a grid of secondary electrodes to stabilize the propagation of action potentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If higher frequencies and amplitudes of functional electrical stimuli are applied to enforce excitation wave propagation in impaired nerve tissue, then propagation can be achieved, but conduction blocks may be facilitated and the process of training paralyzed muscles may be completely disrupted
Solution Approach 1:
The patent applies periodic sub-threshold electrical stimuli at a frequency slightly higher than the natural frequency of the action potential propagation. This periodic stimulation creates resonant effects that stabilize the propagation process, preventing conduction blocks while maintaining reliable excitation wave transmission through the impaired nerve tissue.
Solution Approach 2:
The patent utilizes electrical vibration at resonant frequencies to stabilize action potential propagation. By applying sub-threshold stimuli that resonate with the natural oscillation frequency of the nerve tissue, the system enhances propagation stability without requiring high amplitudes that would cause conduction blocks.
2Productivity
If conventional FES methods are used to restore muscle contraction in paralyzed individuals, then muscle movement can be achieved, but the method may fail when nerve conductivity is significantly reduced
Solution Approach 1:
The patent introduces sub-threshold electrical stimuli as an intermediary mechanism to facilitate action potential propagation through severely impaired nerve tissue. These intermediate stimuli do not directly trigger muscle contraction but serve as mediators that restore the conductivity needed for conventional FES to effectively restore muscle function.
Solution Approach 2:
The patent changes the frequency parameter of electrical stimulation to be slightly higher than the natural resonance frequency of the nerve tissue. This parameter change enables effective propagation in impaired tissue by exploiting resonant effects, thereby restoring functional capability even when nerve conductivity is significantly reduced.
3Productivity
If multiple spatially distributed electrodes are used to deliver programmable stimuli, then stimulation effect can be maximized, but the system complexity increases with variety of control units and electrical leads
Solution Approach 1:
The patent employs a multi-electrode array that serves multiple functions: delivering sub-threshold stimuli, monitoring propagation stability, and providing feedback for adaptive control. This universal electrode system maximizes stimulation effect while reducing overall system complexity by consolidating multiple functions into a single integrated component.
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 approach stabilizes the propagation of action potentials at higher primary stimulation frequencies, effectively restoring muscle function and treating neuropathic pain by achieving resonant frequency locking, even in tissues with severely impaired conductivity.
Implementation Method 1
The present invention is based on a concept of non-linear resonance and may be implemented for acceleration and stabilization of a wave propagating in nerve tissue with critically impaired excitation.
Data Source
AI summary
The present invention provides a method of stimulating an excitable tissue (e.g., in vitro, in vivo) with a primary electrical stimulus through a primary electrode at a primary stimulation frequency, to produce a propagating action potential in the excitable tissue. The invention is carried out by concurrently stimulating the excitable tissue with a secondary electrical stimulus through at least one secondary electrode at a secondary stimulation frequency. The primary and secondary stimulation frequencies are preferably different from one another. The secondary electrical stimulus preferably has an amplitude not more than one third that of the primary electrical stimulus. Preferably, propagation of the action potential in the excitable tissue is enhanced (e.g., when propagation of action potentials in the tissue is otherwise unstable, partially blocked, or fully blocked). Apparatus for carrying out the method is also described.