Adaptive Cardiac Sensing and Therapy Parameter Adjustment
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Solution Overview
Problem
Implantable medical device systems, such as cardiac pacemakers and implantable cardioverter defibrillators, face challenges in delivering effective cardiac therapy due to changes in heart position caused by posture and respiration, leading to reduced efficacy and efficiency of cardiac sensing and therapy delivery.
Innovation Solution
The system stores values for cardiac therapy and sensing parameters associated with different heart position states and modifies these parameters based on the current heart position, using processing circuitry to determine the current position state and adjust the therapy delivery accordingly, including modifying electrode vectors for improved sensing and therapy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cardiac therapy and sensing parameters are delivered without modification, then the device complexity is reduced, but the accuracy of arrhythmia detection and effectiveness of therapy delivery deteriorate due to heart position changes
Solution Approach 1:
The patent applies dynamics by making the sensing and therapy parameters dynamic rather than static. The system continuously monitors heart position changes and automatically adjusts parameters in real-time, transforming the device from a fixed-parameter system to an adaptive one that responds to changing physiological conditions.
Solution Approach 2:
The patent implements parameter changes by modifying sensing thresholds, therapy magnitudes, and electrode vectors based on detected heart position states. The system stores multiple parameter sets corresponding to different heart positions and switches between them as needed, ensuring optimal performance across varying anatomical conditions.
2Reliability
If cardiac therapy parameters are modified to account for heart position changes, then the effectiveness of therapy delivery is improved, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-storing multiple sets of therapy and sensing parameters corresponding to different heart position states before actual therapy delivery. When a heart position change is detected, the system retrieves the appropriate pre-configured parameters, avoiding the need for complex real-time calculations.
Solution Approach 2:
The patent implements feedback by continuously monitoring heart position and using this information to adjust therapy parameters. The system creates a closed-loop control mechanism where detected position changes trigger parameter modifications, ensuring therapy effectiveness adapts to changing anatomical conditions.
3Ease of operation
If fixed sensing parameters are used, then the device operation is simplified, but the specificity of arrhythmia detection deteriorates due to reduced accuracy in changing heart positions
Solution Approach 1:
The patent applies self-service by enabling the device to automatically monitor its own performance and adjust parameters without external intervention. The system self-regulates by detecting heart position changes and autonomously modifying sensing thresholds and therapy parameters, eliminating the need for manual reconfiguration.
Data Source
AI summary
In some examples, a method for controlling delivery of cardiac therapy and cardiac sensing by a medical device system including electrodes for delivering the cardiac therapy may include storing, in a memory of the medical device system, a respective value for each of a plurality of cardiac therapy and/or sensing parameters and, in association with each of a plurality of heart position states, a respective modification of at least one of the cardiac therapy and/or sensing parameters. Such a method also may include determining a current one of the plurality of heart position states of the patient, modifying the at least one cardiac therapy and/or sensing parameter value according to the modification associated with the current heart position state, and controlling the delivery of the cardiac therapy and/or cardiac sensing according to the modified at least one cardiac therapy and/or sensing parameter value.