Dynamic Stimulation Parameter Variation for Spinal Cord Therapy
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Solution Overview
Problem
Spinal Cord Stimulation (SCS) therapy often causes paresthesia, a sensation that can be uncomfortable for patients, and achieving effective pain relief without paresthesia is challenging, especially due to the need for higher-frequency stimulation that drains the implantable pulse generator's battery quickly.
Innovation Solution
The use of supra-perception sweet spot searching to quickly determine effective electrodes for sub-perception therapy, optimizing stimulation parameters such as frequency and pulse width to minimize paresthesia while reducing battery drain, by employing symmetric biphasic pulses and Multiple Independent Current Control (MICC) to shape the electric field effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher-frequency stimulation is used to achieve effective pain relief without paresthesia, then pain relief effectiveness is improved, but battery power consumption increases
Solution Approach 1:
The system dynamically adjusts stimulation parameters including frequency, pulse width, and amplitude based on real-time feedback from tissue response sensors. This allows the stimulator to optimize pain relief effectiveness while minimizing power consumption by adapting to changing tissue conditions and patient needs, rather than operating at fixed high-frequency settings.
Solution Approach 2:
The patent employs multiple stimulation parameters (frequency, pulse width, amplitude, duty cycle) that can be independently adjusted and optimized. By changing these parameters in combination, the system achieves effective pain relief at lower power consumption levels, avoiding the need for continuously high-frequency stimulation that would drain the battery rapidly.
2Reliability
If conventional SCS therapy is used to treat chronic pain, then pain relief is achieved, but paresthesia occurs causing patient discomfort
Solution Approach 1:
The system incorporates sensors that detect tissue response and patient feedback, which are used to adjust stimulation parameters in real-time. This closed-loop feedback mechanism allows the system to distinguish between therapeutic effects (pain relief) and unwanted side effects (paresthesia), optimizing stimulation to maximize pain relief while minimizing or eliminating paresthesia.
Solution Approach 2:
The patent utilizes multiple adjustable stimulation parameters including frequency, pulse width, amplitude, and duty cycle. By optimizing the combination of these parameters, the system can achieve pain relief through mechanisms that do not rely on traditional high-frequency paresthesia-inducing stimulation, thereby reducing or eliminating uncomfortable sensory side effects.
3Ease of operation
If fixed stimulation parameters are used in SCS therapy, then device operation is simple, but tissue habituation occurs reducing therapy effectiveness
Solution Approach 1:
The system automatically varies stimulation parameters over time through dynamic adjustment mechanisms, preventing tissue habituation while maintaining simple operation for the patient. The device can cycle through different parameter sets or adaptively adjust based on tissue response, ensuring continued therapy effectiveness without requiring complex patient intervention.
Solution Approach 2:
The patent employs periodic variation of stimulation parameters such as frequency modulation, pulse width alternation, or amplitude variation at different cycles. This periodic change prevents neural adaptation and tissue habituation, maintaining long-term therapy effectiveness while the overall system operation remains simple and automated.
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 allows for immediate and effective sub-perception therapy with reduced paresthesia and lower power consumption, extending the battery life of the implantable pulse generator and improving patient comfort.
Implementation Method 1
Implantable neurostimulator devices are devices that generate and deliver electrical stimuli to body nerves and tissues
Data Source
AI summary
A method is disclosed for programming a patient's stimulator device using an external device. The method obtains information such as a model at the external device, wherein the information is specific to the patient, wherein the information comprises a range or volume of stimulation parameters determined based on testing of the patient that preferably provide sub-perception therapy; and providing from the external device instructions for execution at the stimulator device, the instructions specifying an amplitude, a pulse width, and a frequency of stimulation pulses to be provided at one of more of electrodes in an electrode array of the patient's stimulator device, wherein the instructions vary over time at least one of the amplitude, pulse width, and frequency within the range or volume. Varying at least one of these parameters helps in preventing the patient's neural tissue from become habituated when compared to stimulation that is provided without variance.