Low-Level Electrical Stimulation for Spasmodic Dysphonia Treatment
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Solution Overview
Problem
Current treatments for focal dystonia, such as botulinum toxin injections and surgical procedures, have limitations in long-term effectiveness and specificity, as they primarily target motor neurons rather than addressing abnormal afferent nerve signals, which are believed to contribute to muscle spasms.
Innovation Solution
A method using low-level electrical stimulation delivered via electrodes to muscles, targeting afferent nerves and gamma motor neurons to reduce muscle spasm by altering abnormal sensory signaling without exceeding the excitation threshold of alpha motor neurons, thereby interrupting the abnormal afferent-efferent loop and resetting gamma bias.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If botulinum toxin injection is used to treat focal dystonia, then muscle spasm is reduced, but long-term effectiveness deteriorates and invasive procedures are required
Solution Approach 1:
The patent replaces the chemical mechanism of botulinum toxin with an electrical stimulation mechanism. Instead of using chemical substances to block neuromuscular transmission, the invention uses electrical impulses delivered through electrodes to modulate nerve activity and reduce muscle spasm, thereby eliminating the need for repeated invasive injections.
Solution Approach 2:
The electrical stimulation device is designed to be adjustable and programmable, allowing patients or clinicians to modify stimulation parameters based on individual response and symptom changes. This self-adjusting capability enables long-term effectiveness without requiring repeated invasive procedures to reassess and reapply treatment.
2Reliability
If electrical nerve stimulation is used to treat dystonia, then muscle spasm is reduced, but the stimulation level must remain below the excitation threshold of alpha motor neurons
Solution Approach 1:
The patent employs precise control of electrical stimulation parameters (amplitude, frequency, pulse duration) to maintain stimulation levels below the excitation threshold of alpha motor neurons. By carefully adjusting these parameters, the device achieves spasm reduction through modulation of afferent nerve signaling without causing unwanted muscle contractions, demonstrating precise parameter control capability.
3Object-generated harmful factors
If recurrent laryngeal nerve resection is performed, then vocal fold spasm is interrupted, but phonatory spasms return over the long term
Solution Approach 1:
The patent replaces the mechanical/surgical approach of nerve resection with electrical stimulation to modulate nerve function. Instead of permanently damaging or removing the recurrent laryngeal nerve, the invention uses controlled electrical impulses to alter afferent signaling and reduce spasm, preserving nerve integrity while achieving long-term symptom control.
Solution Approach 2:
The electrical stimulation device can be adjusted based on patient response and symptom monitoring, allowing optimization of treatment parameters over time. This feedback mechanism enables sustained effectiveness by adapting to changes in nerve sensitivity and muscle response, preventing the recurrence of spasms that occurs with fixed surgical interventions.
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 effectively reduces muscle spasm and improves vocal quality in spasmodic dysphonia, offering a precise and sustainable treatment alternative that maintains effectiveness through dynamic parameter adjustment, potentially replacing invasive treatments like BTX injections.
Implementation Method 1
A method and apparatus for treating focal dystonia comprises using a stimulator to provide a stimulating electrical impulse via an electrode to one or more muscles
Data Source
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AI summary
A method and apparatus for using low levels of electrical stimulation to treat focal dystonia by stimulating the afferent nervous system and/or altering the function of the gamma motor neurons innervating muscles which experience symptomatic spasms. A method and apparatus for treating focal dystonia comprising using a stimulator to provide a stimulating electrical impulse via an electrode to one or more muscles such that the impulse does not provide a level of stimulation that exceeds the excitation threshold of the alpha motor neurons innervating the muscle and thus does not cause muscle contractions.