Ultra-Low Frequency Biphasic Stimulation for Neural Blocking
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Solution Overview
Problem
Current medical devices for delivering electrical stimulation therapy, such as neurostimulation, face challenges in effectively blocking neural activity along nerve fibers without causing undesirable chemical reactions or degrading electrode materials, particularly when treating chronic pain and motor disorders characterized by overactive nerve activity.
Innovation Solution
The use of ultra-low frequency bi-phasic pulses with specific pulse widths and amplitudes, combined with higher frequency stimulation during transitions, is employed to block neural activity while preventing electrode degradation, using advanced electrode coatings like titanium nitride, iridium oxide, or conductive polymer coatings to maintain charge balance and prevent chemical reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high amplitude electrical stimulation is delivered to block neural activity, then neural blocking effectiveness is improved, but electrode degradation and chemical reactions increase
Solution Approach 1:
The patent applies periodic action by delivering electrical stimulation in pulsed form rather than continuous waveforms. The stimulation is delivered as a series of pulses with specific duty cycles, allowing the nerve to be blocked during pulse delivery while providing rest periods. This periodic delivery reduces cumulative charge exposure to the electrode, thereby minimizing electrode degradation and chemical reactions while maintaining effective neural blocking during the active stimulation periods.
Solution Approach 2:
The patent employs parameter changes by utilizing bi-phasic waveforms where the polarity and amplitude parameters are dynamically adjusted within each pulse cycle. The first phase delivers a higher amplitude to initiate blocking, while the second phase reduces amplitude or reverses polarity to prevent charge accumulation. This dynamic parameter modulation enables effective neural blocking while controlling the total charge delivered to the electrode, thus reducing electrode degradation.
2Reliability
If continuous electrical stimulation is delivered to maintain neural block, then pain relief effectiveness is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic action through pulsed stimulation delivery with controlled duty cycles. Instead of continuous stimulation, the device delivers stimulation in periodic bursts followed by intervals without stimulation. This approach maintains pain relief effectiveness by ensuring adequate neural blocking during the pulsed intervals while significantly reducing average power consumption compared to continuous delivery. The inter-pulse intervals allow energy conservation while the blocked state is maintained through the physiological effects of the preceding pulses.
Solution Approach 2:
The patent applies continuity of useful action by designing pulse trains and burst patterns that maintain the neural blocking effect continuously despite the pulsed delivery. Through careful selection of pulse frequency, duration, and inter-pulse intervals, the stimulation maintains its therapeutic effect without complete interruption, creating a continuous useful action (pain relief) from discontinuous energy input. This ensures that the analgesic effect persists throughout the treatment period while energy is consumed only during the actual pulse delivery phases.
3Reliability
If high frequency stimulation is used to block neural activity, then blocking effectiveness is improved, but electrode material degradation accelerates
Solution Approach 1:
The patent applies periodic action by delivering high frequency stimulation in controlled bursts rather than continuously. Within each burst, high frequency pulses effectively block neural activity, but the bursts are separated by intervals that allow charge dissipation and reduce cumulative electrochemical stress on the electrode. This periodic high frequency delivery maintains blocking effectiveness during active periods while extending electrode lifespan by preventing continuous degradation.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting the frequency, amplitude, and duty cycle parameters of the stimulation waveform. The bi-phasic nature of the pulses allows the parameters to change within each pulse cycle, with the second phase compensating for charge imbalances created by the first phase. This parameter modulation enables high frequency stimulation to achieve effective neural blocking while controlling the total charge density delivered to the electrode, thereby reducing electrode material degradation and extending device duration.
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 effectively blocks neural activity along nerve fibers while minimizing electrode degradation, allowing for sustained and targeted therapy delivery, including the preferential blocking of smaller nerve fibers while allowing information to pass through larger fibers, thus providing effective pain relief and motor disorder management.
Implementation Method 1
controlling the delivery of an electrical stimulation therapy to a patient via a medical device, wherein the electrical stimulation therapy includes a plurality of bi-phasic pulses
Implementation Method 2
using advanced electrode coatings like titanium nitride, iridium oxide, or conductive polymer coatings to maintain charge balance and prevent chemical reactions
Data Source
AI summary
In some examples, the disclosure relates to system, devices, and techniques for delivering electrical stimulation therapy to treat patient disorders. In some example, the disclosure is directed to a method including controlling, using processing circuitry, the delivery of an electrical stimulation therapy to a patient via a medical device, wherein the electrical stimulation therapy includes a plurality of bi-phasic pulses, each pulse of the di¬phasic pulses including a first phase followed by a second phase, and wherein the plurality 7 of bi-phasic pulses are configured to substantially block transmission of neural activity′ along nerve fibers.