Neurostimulation With Time-Interleaved Bipolar Electrode Scanning
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Solution Overview
Problem
Existing neurostimulation techniques face challenges in accurately targeting stimulation electrodes due to the small size of the stimulation target and patient movement, leading to inconsistent therapy delivery and potential discomfort.
Innovation Solution
Implementing a time-interleaved cascade of bipolar electrode combinations, where the IMD scans through multiple electrode pairs at a frequency imperceptible to the patient, ensuring broader coverage and increased likelihood of hitting the stimulation target.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical stimulation is delivered via a single pair of electrodes continuously, then the stimulation is focused on a specific location, but the probability of hitting the small stimulation target is low and patient movement causes inconsistent therapy delivery
Solution Approach 1:
The patent divides the stimulation delivery into multiple segments by using different pairs of electrodes from the plurality of electrodes. Instead of continuously stimulating through one electrode pair, the system segments the stimulation across multiple electrode pairs, scanning through them in sequence. This segmentation allows the stimulation to cover a broader area while maintaining focused delivery through each individual electrode pair, thereby increasing the probability of hitting the small stimulation target and maintaining therapy consistency despite patient movement.
Solution Approach 2:
The patent implements dynamic electrode selection by scanning through multiple electrode pairs in sequence rather than using a static single electrode pair. The system dynamically switches between different electrode pairs based on a scanning pattern, allowing the stimulation coverage to adapt and cover different locations. This dynamic approach increases the likelihood of maintaining effective stimulation on the target despite patient movement, while the scanning frequency is maintained above the perception threshold to prevent patient awareness of the switching.
2Reliability
If electrical stimulation is scanned through multiple electrode pairs, then the stimulation coverage area increases and probability of hitting target improves, but the device complexity increases
Solution Approach 1:
The patent employs periodic action by scanning through the multiple electrode pairs in a repeating sequence at a frequency above the patient's perception threshold (greater than 20 Hz, preferably greater than 30 Hz or 45 Hz). This periodic scanning creates the perception of continuous stimulation while actually cycling through discrete electrode pairs. The periodic nature simplifies the control logic compared to complex adaptive algorithms, as the system only needs to implement a repeating scan pattern rather than real-time decision-making, thereby reducing device complexity while maintaining reliable target acquisition.
3Object-affected harmful factors
If scanning frequency is increased to make scanning imperceptible to patient, then patient comfort improves, but energy consumption increases
Solution Approach 1:
The patent applies parameter changes by adjusting the scanning frequency to specific threshold values that render the scanning imperceptible to the patient. The system changes the frequency parameter from perceptible levels (below 20 Hz) to imperceptible levels (above 20 Hz, preferably above 30 Hz or 45 Hz). This parameter adjustment eliminates the harmful effect of patient awareness and discomfort from scanning without requiring excessive energy consumption, as the system operates at the minimum necessary frequency threshold rather than continuously at maximum power levels. The bipolar electrode configurations are also optimized to deliver effective stimulation at these frequency ranges.
Data Source
AI summary
An example method of delivering electrical stimulation includes obtaining, by an implantable medical device (IMD) connected to a lead carrying a plurality of electrodes, one or more stimulation parameters; and delivering, by the IMD and based on the one or more stimulation parameters, electrical stimulation therapy via the plurality of electrodes, wherein delivering the electrical stimulation therapy comprises scanning delivery of the electrical stimulation therapy through different pairs of electrodes of the plurality of electrodes.