Segmented Electrode Lead Control for Adaptive Stimulation Sensing
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Solution Overview
Problem
Existing medical electrical stimulators often deliver therapy with fixed parameters, which may not adequately address varying patient conditions, leading to insufficient treatment or excessive stimulation, causing side effects and inefficient power consumption.
Innovation Solution
The use of segmented leads with symmetrical electrical stimulation delivery and adaptive sensing to adjust stimulation parameters based on patient responses, mitigating sensing artifacts and optimizing therapy delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed parameter stimulation is delivered, then device complexity is reduced, but adaptability to varying patient conditions deteriorates
Solution Approach 1:
The patent implements sensing electrodes that detect physiological responses (such as local field potentials or compound action potentials) and feed this information back to the stimulation generator. The system then automatically adjusts stimulation parameters based on the sensed response, creating a closed-loop adaptive system that responds to varying patient conditions without requiring complex manual reprogramming
Solution Approach 2:
The system transitions from static fixed parameters to dynamic adjustable parameters by enabling real-time modification of stimulation characteristics based on sensed physiological responses. The stimulation generator dynamically adapts pulse amplitude, width, frequency, or electrode selection according to the patient's current state, making the therapy responsive to changing conditions
2Adaptability or versatility
If adaptive sensing is implemented, then adaptability improves, but sensing artifacts increase
Solution Approach 1:
The patent separates the sensing and stimulation functions into distinct electrode groups. Sensing electrodes are positioned to detect physiological signals while stimulation electrodes deliver therapy, physically extracting the sensing function from the stimulation pathway. This spatial separation prevents stimulation artifacts from contaminating the sensed signals, enabling clean adaptive feedback
Solution Approach 2:
The system uses dedicated sensing electrodes as intermediaries between the tissue and the stimulation generator's sensing input. These specialized sensing electrodes are designed to preferentially detect specific physiological signals (such as compound action potentials) while being less susceptible to stimulation artifacts, acting as a mediator that filters out harmful interference
3Reliability
If stimulation parameters are increased to address varying conditions, then treatment effectiveness improves, but power consumption increases
Solution Approach 1:
The system dynamically adjusts stimulation parameters based on real-time sensing feedback rather than using fixed high-level parameters. By adapting the stimulation to the minimum effective level needed to achieve the desired physiological response, the system maintains treatment effectiveness while minimizing power consumption during different phases of therapy delivery
Data Source
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AI summary
An example system includes a lead including a first electrode disposed at a first level, a second electrode disposed at a second level, a first group of segmented electrodes disposed at a third level, and a second group of segmented electrodes disposed at a fourth level. The example system also includes a medical device configured to deliver symmetrical electrical stimulation to a patient via the first group of segmented electrodes and the second group of segmented electrodes and sense a response to the stimulation via the first electrode and the second electrode.