Low-Frequency Spinal Cord Stimulation for Paresthesia-Free Pain Relief
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Solution Overview
Problem
Existing spinal cord stimulation (SCS) systems often cause paresthesia, which is the unwanted sensation of tingling or numbness, at higher frequencies, limiting their effectiveness and patient comfort.
Innovation Solution
The system employs lower frequencies and specific pulse widths, within defined linearly-bounded regions, to generate biphasic stimulation pulses that minimize paresthesia, using a method that includes programming the spinal cord stimulator to deliver stimulation pulses based on information that optimizes frequency and pulse width for pain relief without paresthesia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher frequencies are used for spinal cord stimulation, then pain relief effectiveness is improved, but paresthesia (unwanted tingling or numbness sensation) increases
Solution Approach 1:
The patent applies parameter changes by transitioning from traditional higher frequency stimulation to lower frequency stimulation (e.g., 1-100 Hz range), and by optimizing pulse width parameters (e.g., 20-500 microseconds) to achieve effective pain relief while minimizing or eliminating paresthesia. This parameter optimization allows the system to operate in a therapeutic window that avoids unwanted sensory side effects.
Solution Approach 2:
The patent employs periodic action through pulsed stimulation delivery, where stimulation is delivered in controlled pulses rather than continuous waveforms. By adjusting pulse frequency, pulse width, and inter-pulse intervals, the system achieves cumulative therapeutic effect while allowing neural tissue recovery periods, thereby reducing paresthesia while maintaining pain relief effectiveness.
2Object-affected harmful factors
If lower frequencies are used to reduce paresthesia, then patient comfort is improved, but pain relief effectiveness may be reduced
Solution Approach 1:
The patent resolves this contradiction through multi-parameter optimization, not just frequency adjustment. By simultaneously optimizing pulse width (duration), amplitude, frequency, and duty cycle, the system achieves effective pain blockade at lower frequencies. The extended pulse width compensation for lower frequency operation ensures sufficient neural fiber activation for pain relief without triggering paresthesia.
Solution Approach 2:
The patent applies dynamics by implementing adaptive stimulation parameters that can be adjusted based on patient response, pain levels, and tissue conditions. The system allows dynamic programming of stimulation parameters to optimize the balance between pain relief and paresthesia minimization for each patient and clinical situation.
3Object-affected harmful factors
If optimized frequency and pulse width parameters are used to eliminate paresthesia, then patient comfort is improved, but power consumption may increase
Solution Approach 1:
The patent applies periodic action with optimized duty cycles, delivering stimulation in pulsed fashion with appropriate on/off ratios. By using lower frequencies with optimized pulse widths and duty cycles (e.g., 10-90% duty cycle ranges), the system reduces average power consumption compared to continuous high-frequency stimulation, while maintaining therapeutic effectiveness and eliminating paresthesia.
Data Source
AI summary
Methods and systems for testing and treating spinal cord stimulation (SCS) patients are disclosed. Patients are eventually treated with sub-perception (paresthesia free) therapy. However, supra-perception stimulation is used during “sweet spot searching” during which active electrodes are selected for the patient. This allows sweet spot searching to occur much more quickly and without the need to wash in the various electrode combinations that are tried. After selecting electrodes using supra-perception therapy, therapy is titrated to sub-perception levels using the selected electrodes. Such sub-perception therapy has been investigated using pulses at or below 10 kHz, and it has been determined that a statistically significant correlation exists between pulse width (PW) and frequency (F) in this frequency range at which SCS patients experience significant reduction in symptoms such as back pain. Beneficially, sub-perception stimulation at such low frequencies significantly lowers power consumption in the patient's neurostimulator.