Nerve Stimulation System with Delayed Dual-Electrode Activation
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Solution Overview
Problem
Existing nerve stimulation systems face challenges such as nerve fatigue, anodic block, and limited activation of deeper nerve fibers due to high activation thresholds and inefficient use of electrode contacts.
Innovation Solution
The system introduces a delay between stimulations applied by two separate stimulators, allowing the nerve to recover before the second stimulation, and uses a configuration where each stimulator can operate as both anode and cathode to optimize nerve activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bipolar neural interfaces use the distal contact exclusively as cathode and proximal contact exclusively as anode, then the stimulation pattern is simple and predictable, but fibers close to the cathode surface are subject to anodic block and fibers deeper below the anode contact surface are not activated
Solution Approach 1:
The patent implements dynamic switching of electrode polarities between alternating cathodic and anodic phases, allowing each contact to function as both cathode and anode at different times. This dynamic configuration enables comprehensive activation of nerve fibers at different depths and locations, resolving the limitation of static bipolar interfaces that could only activate fibers in specific regions.
Solution Approach 2:
The system employs periodic alternation between cathodic and anodic stimulation phases, creating a rhythmic pattern of activation and recovery. This periodic action allows different nerve fibers to be activated during different phases of the cycle, preventing fatigue and enabling more complete engagement of the neurovascular bundle over time.
2Power
If cathodic pulses are used for stimulation, then activation thresholds are lower, but anodic block occurs at contact edges when nerve fiber is very close to the cathode contact surface
Solution Approach 1:
The system applies a preliminary anodic phase before the cathodic phase, which prevents anodic block by ensuring that the nerve fiber is not in a blocked state when the high-intensity cathodic pulse arrives. This preliminary action counteracts the potential harmful effect of anodic block while maintaining the low threshold activation benefit of cathodic pulses.
Solution Approach 2:
By periodically alternating between cathodic and anodic phases, the system allows nerve fibers to recover from anodic block during the inter-phase interval, preventing cumulative block effects and maintaining activation efficiency over repeated stimulation cycles.
3Productivity
If stimulation frequency is increased to treat diseases, then therapeutic effect is improved, but nerves become susceptible to fatigue and action potential conduction slowing
Solution Approach 1:
The system uses periodic alternation between cathodic and anodic phases with appropriate inter-phase intervals, creating a rhythm that allows nerve fibers to recover between high-frequency stimulation events. This periodic structure enables sustained high-frequency therapy while preventing fatigue and conduction slowing by ensuring adequate recovery time for unmyelinated C-fibers.
Solution Approach 2:
The system deliberately introduces recovery intervals between stimulation phases, allowing nerve fibers to discard accumulated fatigue and recover their responsiveness. This recovery period is essential for maintaining reliable nerve activation during prolonged high-frequency therapy sessions.
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 reduces nerve fatigue, minimizes anodic block, and allows for more effective activation of deeper nerve fibers, resulting in a greater and more uniform bolus of axon firing and improved therapeutic efficacy.
Implementation Method 1
a first stimulator attached to a nerve interface is arranged to provide a first electrical stimulation to the nerve
Implementation Method 2
This delay provides time for the nerve to recover (i.e. repolarize) from the first stimulation before the second stimulation is applied
Implementation Method 3
a second stimulator attached to the nerve interface is arranged to provide a second electrical stimulation to the nerve
Data Source
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AI summary
A system (1) for electrically stimulating a nerve (3), the system comprising: a first stimulator (5) and a second stimulator (7) for electrically stimulating the nerve, the first stimulator and the second stimulator spaced apart from one another by a first distance; and a controller (9) arranged to: a) set a time interval as a function of the first distance and the speed of propagation of an action potential in the nerve; b) activate the first stimulator for a first stimulation period, thus inducing electrical activity in the nerve; and c) activate the second stimulator for a second stimulation period after the time interval has elapsed after the end of the first time period. Preferably, the time interval is a sum of the first time period and a buffer time period for allowing the nerve to recover from stimulation.