Cervical Spinal Cord Stimulation for Restoring Tetraplegic Hand Control
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Solution Overview
Problem
Serious spinal cord injuries often result in complete loss of sensory motor function below the level of the spinal lesion, leading to rare improvements in hand function, especially in tetraplegic subjects, limiting their independence and daily life activities.
Innovation Solution
Applying spinal cord stimulation, either transcutaneous or epidural, combined with selective pharmaceuticals like monoaminergic agonists, to neuromodulate the cervical spinal cord and facilitate voluntary control of hand function by exploiting the spinal circuitry's ability to interpret proprioceptive information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If spinal cord stimulation is applied to restore hand function in tetraplegic subjects, then hand strength and motor control are improved, but the complexity of the treatment device and protocol increases
Solution Approach 1:
The treatment protocol is segmented into multiple components: transcutaneous electrical spinal cord stimulation (tSCS) applied to specific cervical segments (C3-C6), combined with selective pharmaceutical administration (monoaminergic agonists like buspirone or dopaminergic agonists like apomorphine). This segmentation allows each component to target specific physiological mechanisms, improving hand function while maintaining manageable device complexity through modular treatment delivery.
Solution Approach 2:
The patent introduces pharmaceutical agents as intermediaries that enhance the effectiveness of spinal cord stimulation. Monoaminergic agonists and dopaminergic agonists act as mediators that modulate spinal cord circuitry excitability, thereby amplifying the functional recovery effects of tSCS. This intermediary approach allows lower stimulation intensities to achieve greater therapeutic effects, potentially reducing overall system complexity.
2Ease of operation
If spinal cord stimulation combined with pharmaceuticals is used to improve hand function, then motor control and force generation are restored, but the treatment protocol becomes more complex
Solution Approach 1:
The treatment protocol employs preliminary action by administering pharmaceutical agents (monoaminergic agonists or dopaminergic agonists) before or concurrent with spinal cord stimulation to pre-condition the spinal cord circuitry. This preliminary pharmacological preparation enhances the responsiveness of spinal motor circuits to subsequent electrical stimulation, improving motor control outcomes while allowing for more efficient treatment delivery.
Solution Approach 2:
The patent utilizes parameter changes by systematically varying stimulation parameters (frequency, amplitude, pulse width) and pharmaceutical dosages to optimize treatment effectiveness. By adjusting these parameters based on individual patient responses and treatment progress, the protocol achieves improved motor control while maintaining flexibility to simplify the overall approach through personalized parameter optimization.
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
The method significantly improves hand strength and fine motor control in tetraplegic subjects, with mean hand strength increasing by over 300% in some cases, demonstrating the potential for functional and psychological recovery.
Implementation Method 1
neuromodulating the cervical spinal cord of the subject by administering stimulation to the cervical spinal cord or a region
Implementation Method 2
by administering to the subject at least one monoaminergic agonist
Data Source
AI summary
In various embodiments, methods are provided for applying transcutaneous and/or epidural spinal cord stimulation with and without selective pharmaceuticals to restore voluntary control of hand function in tetraplegic subjects.