ECAP-Guided Therapy Parameter Control Against Patient Accommodation
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Solution Overview
Problem
Existing electrical stimulation therapies face challenges in maintaining efficacy over time due to patient accommodation, leading to potential discomfort from fluctuating intensity, which conventional parameter adjustments fail to address effectively.
Innovation Solution
A medical device adjusts therapy parameters based on evoked compound action potential (ECAP) levels, comparing them to a threshold to maintain intensity within a comfortable and effective range, thereby preventing accommodation and discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If therapy parameters are adjusted to prevent patient accommodation, then therapy effectiveness is maintained, but patient discomfort increases due to intensity fluctuations
Solution Approach 1:
The system continuously monitors ECAP levels and uses this feedback to dynamically adjust therapy parameters. When ECAP exceeds the threshold, the system reduces amplitude or pulse width; when ECAP is below the threshold, it increases these parameters. This closed-loop feedback mechanism prevents patient accommodation while maintaining comfort by responding to real-time neural responses.
Solution Approach 2:
The system dynamically changes multiple therapy parameters (amplitude, pulse width, pulse frequency) based on ECAP measurements. By adjusting these parameters in coordination rather than independently, the system maintains therapy effectiveness while preventing discomfort from excessive intensity fluctuations.
2Object-affected harmful factors
If a single therapy parameter is adjusted to maintain ECAP threshold, then therapy intensity is controlled, but patient accommodation occurs over time
Solution Approach 1:
The system dynamically adjusts multiple therapy parameters over time based on continuous ECAP monitoring. Rather than fixing parameters or adjusting only one, the system makes coordinated changes to amplitude, pulse width, and pulse frequency, creating a dynamic adaptation that prevents patient accommodation while maintaining intensity control.
Solution Approach 2:
The system periodically measures ECAP levels and adjusts therapy parameters at scheduled intervals. This periodic measurement and adjustment cycle ensures that therapy remains effective over time by preventing accommodation, while the controlled nature of periodic adjustments avoids causing discomfort from random intensity changes.
3Object-affected harmful factors
If therapy parameters are kept constant to avoid discomfort, then patient comfort is maintained, but accommodation occurs reducing therapy effectiveness
Solution Approach 1:
The system uses ECAP feedback to determine when parameter adjustments are necessary. As long as ECAP remains at or below the threshold, parameters stay constant, maintaining comfort. When ECAP approaches the threshold, the system makes controlled adjustments to prevent accommodation, thus maintaining both comfort and effectiveness over time.
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
The solution ensures consistent therapeutic benefits without causing discomfort by dynamically adjusting therapy parameters to keep ECAP levels approximately equal to the ECAP threshold, thereby maintaining long-term efficacy and patient comfort.
Implementation Method 1
One way to determine intensity of the therapy is the level of the ECAP that is evoked in response to the delivery of therapy
Data Source
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Figure 3A~3C
AI summary
Techniques for therapy delivery are described. A processing circuit may adjust a first therapy parameter from a first level to a second level, and responsive to the adjustment of the first therapy parameter, compare a level of an evoked compound action potential (ECAP) generated from therapy delivery based on the adjusted first therapy parameter to an ECAP threshold. The processing circuit may adjust a second therapy parameter from a third level to a fourth level based on the comparison. The second therapy parameter is different than the first therapy parameter. The processing circuit may cause therapy delivery with the first therapy parameter at the second level and the second therapy parameter at the fourth level.