Multi-Site Transcutaneous Spinal Stimulation for Locomotor Recovery
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Solution Overview
Problem
Existing treatments for spinal cord injuries and neurological disorders, such as paralysis, often fail to effectively restore motor function, particularly in cases of complete spinal cord injuries where there is no voluntary movement below the lesion level.
Innovation Solution
Non-invasive transcutaneous electrical spinal cord stimulation (tESCS) is applied at multiple spinal levels (e.g., C4-C5, T11-T12, and/or L1-L2) with frequencies of 5-40 Hz to activate spinal locomotor networks, combined with physical training and optional pharmacological agents, to facilitate voluntary movements and autonomic functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If epidural electrical stimulation is used to enable motor function, then motor function can be enabled, but the treatment is invasive and complex
Solution Approach 1:
The patent uses transcutaneous electrical stimulation as an intermediary method to activate spinal cord circuits without requiring direct epidural electrode insertion. Surface electrodes applied to the skin serve as a mediator to deliver stimulation current through the spinal cord, enabling motor function while avoiding the invasive complexity of epidural implants.
Solution Approach 2:
The patent replaces the mechanical invasion of epidural electrodes with a non-invasive electrical stimulation approach. Instead of physically inserting electrodes into the epidural space, the system uses transcutaneous electrical stimulation to achieve the same functional outcome, thereby reducing device complexity and invasiveness.
2Reliability
If transcutaneous electrical spinal cord stimulation is applied at multiple sites, then motor function and autonomic control are improved, but the treatment protocol becomes more complex
Solution Approach 1:
The patent divides the spinal cord stimulation into multiple discrete sites (cervical, thoracic, lumbar regions) that can be stimulated independently. This segmentation allows for targeted activation of specific spinal circuits responsible for different functions, improving both motor and autonomic control while enabling modular protocol design.
Solution Approach 2:
The multi-site transcutaneous electrical stimulation system serves multiple functions simultaneously: it activates spinal locomotor networks for motor control, modulates autonomic circuits for cardiovascular and respiratory control, and facilitates sensory reeducation. This multi-functionality achieves comprehensive recovery while using a unified stimulation platform.
3Productivity
If spinal cord stimulation frequency is increased to 5-40 Hz, then locomotor activity is enhanced, but energy consumption increases
Solution Approach 1:
The patent employs periodic electrical stimulation at frequencies of 5-40 Hz to activate spinal locomotor networks. This periodic action rhythmically activates motor neurons and spinal circuits, enhancing locomotor activity. The frequency can be adjusted based on the specific therapeutic goal, balancing productivity enhancement with energy consumption considerations.
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
Enables involuntary and voluntary movements, including stepping, standing, grasping, and autonomic functions, by modulating spinal circuits to interpret proprioceptive and supraspinal information, even in subjects with complete spinal cord injuries.
Implementation Method 1
Transcutaneous electrical spinal cord stimulation (tESCS) can be applied in the regions of the C4-C5, T11-T12 and/or L1-L2 vertebrae with a frequency of 5-40 Hz. Such stimulation can elicit involuntary step-like movements in healthy subjects with their legs suspended in a gravity-neutral position.
Data Source
AI summary
In various embodiments, non-invasive methods to induce motor control in a mammal subject to spinal cord or other neurological injuries are provided. In some embodiments the methods involve administering transcutaneous electrical spinal cord stimulation (ISCS) to the mammal at a frequency and intensity that induces locomotor activity.