Optical Stimulation of Peripheral Nervous System Motor Units
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Solution Overview
Problem
External electrical stimulation of motor neurons in the peripheral nervous system often reverses the normal recruitment order, leading to fatigue and loss of fine motor control, and existing methods for sensory feedback, such as pain management, are inadequate and have significant side effects.
Innovation Solution
Engineering light-responsive channels or pumps in motor units and peripheral nerves to allow for optical stimulation that recruits motor units in a normal physiologic order and modulates pain recognition, using molecules like ChR2 and NpHR to control ion flow and membrane voltage for precise neural activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If external electrical stimulation is used to activate motor neurons, then muscle activation is achieved, but the normal recruitment order is reversed causing fatigue and loss of fine motor control
Solution Approach 1:
The patent replaces electrical stimulation with optical stimulation (light) to activate motor neurons. By using light-sensitive channels such as channelrhodopsin-2 (ChR2) instead of electrical currents, the system achieves muscle activation while maintaining normal physiological recruitment order, thereby preserving fine motor control and reducing fatigue.
Solution Approach 2:
The patent changes the stimulation parameter from electrical voltage/current to optical wavelength and intensity. By tuning the wavelength (e.g., 470 nm for ChR2) and intensity of light, selective activation of motor neurons can be achieved without reversing the recruitment order, thus maintaining motor control precision while achieving effective muscle activation.
2Object-affected harmful factors
If traditional pain management methods are used, then pain relief is achieved, but significant side effects occur
Solution Approach 1:
The patent replaces pharmacological pain management with optical stimulation of sensory nerves. By using light-activated channels to modulate pain signal transmission, the system achieves pain relief without the side effects associated with medications such as opioids, NSAIDs, or antidepressants.
Solution Approach 2:
The patent introduces light-sensitive channels (e.g., ChR2, NpHR) as intermediaries between the optical stimulus and nerve activation. These channels act as mediators that convert light energy into selective nerve activation or inhibition, providing precise control over pain pathways without systemic side effects.
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
Optical stimulation effectively recruits motor units in a normal order, reducing muscle fatigue and providing precise control over muscle contractions, while also offering a targeted approach to managing pain and other sensory-related disorders with minimal side effects.
Implementation Method 1
Engineering light-responsive channels or pumps in motor units and peripheral nerves to allow for optical stimulation that recruits motor units in a normal physiologic order and modulates pain recognition, using molecules like ChR2 and NpHR to control ion flow and membrane voltage for precise neural activation
Data Source
AI summary
A variety of methods, devices, systems and arrangements are implemented for stimulation of the peripheral nervous system. Consistent with one embodiment of the present invention, method is implemented in which light-responsive channels or pumps are engineered in a set of motor units that includes motor units of differing physical volumes. Optical stimuli are also provided to the light-responsive channels or pumps at an optical intensity that is a function of the size of motor units to be recruited. In certain implementations, the intensity of the optical stimuli is increased so as to recruit increasingly larger motor units.