Ventral Spinal Cord Stimulation for Motor Disorders
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Solution Overview
Problem
Conventional spinal cord stimulation techniques for treating motor disorders, such as Parkinson's Disease and essential tremor, have not demonstrated long-term efficacy in a large number of patients, with dorsal column stimulation showing limited widespread use due to inconsistent results.
Innovation Solution
A method involving the use of a stimulation lead with electrodes positioned in the ventral portion of the epidural space, facing the spinal cord, and applying electrical stimulation energy to ventral column nerve fibers at frequencies above 100 Hz and pulse widths less than 20 μs to inhibit nerve impulses, thereby treating symptoms affecting peripheral regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dorsal column stimulation is used to treat motor disorders, then the therapy can be provided through conventional SCS techniques, but the long-term efficacy is inconsistent and limited across large numbers of patients
Solution Approach 1:
The patent inverts the conventional stimulation approach by switching from dorsal column stimulation to ventral column stimulation. This inversion targets the specific neural pathways involved in motor control (corticospinal tracts) rather than general sensory pathways, thereby improving both reliability of efficacy and adaptability for motor disorder treatment
2Ease of operation
If stimulation is applied to the dorsal column to restore balance between excitatory and inhibitory inputs, then sensory input can be modulated, but the treatment does not provide consistent benefit across patients
Solution Approach 1:
The patent applies local quality by targeting specific ventral column nerve fibers that innervate affected peripheral regions rather than general dorsal column stimulation. This localized approach to motor pathways provides more reliable and consistent benefit for motor disorders while maintaining ease of operation through standard SCS techniques
3Reliability
If high frequency stimulation above 100 Hz with pulse width less than 20 μs is applied to ventral column nerve fibers, then nerve impulses can be effectively inhibited, but the stimulation parameters require precise control
Solution Approach 1:
The patent specifies precise parameter changes (frequency >100 Hz, pulse width <20 μs) optimized for ventral column stimulation to achieve reliable nerve impulse inhibition. These parameter specifications improve reliability of motor disorder treatment while the use of standard SCS delivery systems minimizes additional device complexity
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 provides targeted therapy by inhibiting nerve impulses from the brain to peripheral regions, potentially offering more effective symptom management for motor disorders compared to traditional dorsal column stimulation.
Implementation Method 1
electrical stimulation energy conveyed to the electrodes creates an electrical field, which when strong enough, depolarizes (or 'stimulates') the neural fibers within the spinal cord beyond a threshold level, thereby inducing the firing of action potentials (APs) that propagate along the neural fibers
Implementation Method 2
applying electrical stimulation energy to at least one ventral column nerve fiber of the patient, thereby treating symptoms of the motor disorder. The applied electrical stimulation energy may inhibit nerve impulses traveling from the patient's brain to a peripheral region exhibiting the symptoms of the motor disorder
Data Source
AI summary
A method for using spinal cord stimulation to treat symptoms of motor disorders includes implanting a stimulation lead within a ventral portion of the epidural space. The lead is implanted with at least a portion of the electrodes facing the spinal cord. In a method for providing therapy to a patient suffering from a motor disorder, electrical stimulation energy is applied to at least one ventral column nerve fiber through the implanted stimulation lead. A peripheral region of the patient's body exhibits the symptoms of the motor disorder, and the ventral column nerve fiber to which the stimulation is applied innervates that peripheral region.