Coupled Burst and Tonic Neurostimulation for Pain Relief
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Solution Overview
Problem
Current neurostimulation systems face challenges in effectively managing chronic neuropathic pain without inducing paresthesia and lack understanding of the relationship between neuropathic pain and burst therapy, particularly in the coupled operation of tonic and burst therapies.
Innovation Solution
A method and system for simultaneous burst and tonic stimulation, where a tonic stimulation waveform excites A-beta fibers, followed by a burst stimulation waveform timed during the refractory period of A-beta fibers to avoid re-excitation, with adjustable tonic-burst delay to optimize pain relief and minimize C-fiber sensory action potential components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tonic stimulation is delivered to excite A-beta fibers for pain relief, then pain management is improved, but paresthesia is induced causing discomfort and irritation
Solution Approach 1:
The stimulation is segmented into two distinct phases: tonic stimulation phase that excites A-beta fibers for pain relief, and burst stimulation phase that occurs during the refractory period to avoid paresthesia. This segmentation allows selective activation of different fiber populations at different time intervals, resolving the contradiction between effective pain management and avoidance of uncomfortable paresthesia.
Solution Approach 2:
The system employs periodic bursting stimulation superimposed on continuous tonic stimulation. The burst stimuli are delivered in periodic intervals during the refractory period of A-beta fibers, creating a rhythmic pattern that maintains pain relief efficacy while minimizing paresthesia. This periodic action allows the system to exploit the temporal refractory properties of nerve fibers.
2Object-affected harmful factors
If burst stimulation is delivered to reduce neuropathic pain without paresthesia, then patient comfort is improved, but limited information is available regarding optimal therapy parameters and coupling with tonic stimulation
Solution Approach 1:
The system incorporates feedback mechanisms where the IPG monitors the physiological response to burst stimulation and adjusts therapy parameters accordingly. This feedback loop enables optimization of burst stimulation parameters (amplitude, pulse width, frequency, duty cycle) based on actual patient response, compensating for the lack of extensive prior knowledge about optimal parameters. The system learns and adapts to individual patient needs over time.
Solution Approach 2:
The burst stimulation parameters are made dynamic and adjustable rather than fixed. The system allows real-time modification of amplitude, pulse width, frequency, and duty cycle parameters based on patient response and clinical assessment. This dynamic approach enables optimization of therapy parameters even in the absence of extensive pre-established parameter knowledge, as the system can be tuned to individual patient requirements.
3Reliability
If coupled tonic and burst stimulation is delivered with precise timing, then therapy efficacy is improved, but device complexity increases
Solution Approach 1:
The system merges tonic and burst stimulation modalities into a single integrated therapy delivered through one IPG and lead system. The controller combines both stimulation types with precise temporal coordination, where burst stimuli are superimposed on the tonic stimulation baseline. This merging approach achieves enhanced therapy efficacy while avoiding the need for separate devices, as the coordination logic is implemented within the existing IPG architecture.
Solution Approach 2:
The IPG controller acts as an intermediary that coordinates between the tonic stimulation generator and burst stimulation generator. It manages the timing relationship between the two modalities, ensuring burst stimuli are delivered during the refractory period of A-beta fibers. This intermediary control layer simplifies the overall system architecture by centralizing the coordination logic rather than requiring complex inter-device communication and synchronization.
Data Source
AI summary
A system and method for delivering coupled burst and tonic stimulation of nervous tissue is provided. The system and method includes providing a lead with at least one stimulation electrode configured to be implanted at a target position proximate to nervous tissue of interest. The system and method further includes coupling the lead to an implantable pulse generator (IPG). The method delivers a first current pulse configured as a tonic stimulation waveform to the at least one electrode. The tonic stimulation waveform is configured to excite A-beta fibers of the nervous tissue. After a tonic-burst delay, the IPG delivers second current pulses configured as a burst stimulation waveform to at least one electrode. The burst stimulation waveform is configured to excite C-fibers of the nervous tissue.