Spinal Cord Stimulation Parameter Tuning for Paresthesia-Free Pain Relief
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing spinal cord stimulation 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, along with biphasic pulses, to provide pain relief without inducing paresthesia, utilizing a method to determine optimal stimulation parameters through a programming process that includes adjusting electrode configurations and amplitudes to minimize power consumption.
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 is induced causing patient discomfort
Solution Approach 1:
The patent applies parameter changes by modifying the frequency and pulse width parameters of stimulation pulses to operate within specific ranges (e.g., 10-100 Hz frequency with 200-500 μs pulse width) that provide pain relief while avoiding paresthesia. This resolves the contradiction by finding optimal parameter values that satisfy both effectiveness and comfort requirements
Solution Approach 2:
The patent uses periodic pulsed stimulation instead of continuous stimulation, delivering electrical pulses at controlled frequencies with specific duty cycles. This periodic action allows sufficient time for neural adaptation and prevents the sustained paresthesia that would occur with continuous high-frequency stimulation, while maintaining effective pain relief
2Object-affected harmful factors
If lower frequencies are used to avoid paresthesia, then patient comfort is improved, but pain relief effectiveness is reduced
Solution Approach 1:
The patent simultaneously optimizes multiple parameters including frequency, pulse width, and amplitude to achieve effective pain relief at lower frequencies. By extending pulse width and adjusting amplitude in conjunction with frequency reduction, the system maintains therapeutic effectiveness while avoiding paresthesia
Solution Approach 2:
The patent implements dynamic adjustment of stimulation parameters based on patient response and therapeutic needs. The system can adaptively modify frequency, pulse width, and amplitude over time to maintain optimal pain relief while preventing paresthesia, resolving the static trade-off between comfort and effectiveness
3Object-affected harmful factors
If optimal stimulation parameters are used to avoid paresthesia, then patient comfort is improved, but power consumption increases
Solution Approach 1:
The patent identifies specific parameter combinations (frequency, pulse width, amplitude) that minimize power consumption while avoiding paresthesia. By operating at optimized points in the parameter space, the system achieves both patient comfort and energy efficiency, resolving the contradiction between comfort and power usage
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.