Cardiac Event Sensing With Multi-Vector Signal Construction
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Solution Overview
Problem
Existing medical devices face challenges in reliably sensing cardiac event signals due to variations in electrode vectors and sensing threshold control parameters, leading to inconsistent detection of arrhythmias and inappropriate therapy delivery.
Innovation Solution
A medical device system that utilizes multiple sensing electrode vectors and constructs cardiac electrical signals to determine cardiac events by adjusting cardiac event sensing threshold control parameters, allowing for the identification of optimal settings for sensitivity, amplitude, and timing intervals to enhance arrhythmia detection and therapy delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single sensing electrode vector and fixed sensing threshold control parameter are used, then the device complexity is reduced, but the reliability of cardiac event sensing deteriorates due to inconsistent detection across varying physiological conditions
Solution Approach 1:
The patent implements dynamic adjustment of sensing control parameters including sensitivity, amplitude, and timing intervals based on real-time analysis of cardiac electrical signals. The system automatically adapts the sensing threshold and electrode vector selection according to detected arrhythmia patterns and signal characteristics, transforming a static sensing system into a dynamic one that maintains high reliability across varying physiological conditions.
Solution Approach 2:
The system employs multiple sensing control parameters (sensitivity, amplitude, timing intervals) that can be independently adjusted and optimized. By changing these parameters dynamically based on signal analysis, the system achieves reliable detection across different cardiac conditions without requiring a fixed complex hardware configuration.
2Measurement precision
If multiple sensing electrode vectors and adjustable control parameters are implemented, then the reliability and accuracy of arrhythmia detection is improved, but the device complexity increases
Solution Approach 1:
The patent divides the sensing function into multiple independent controllable parameters (sensitivity, amplitude, timing intervals) and multiple electrode vectors. Each parameter can be independently optimized and adjusted, allowing the system to achieve high measurement precision through fine-grained control without requiring a monolithic complex sensing architecture.
Solution Approach 2:
The system dynamically selects and adjusts sensing parameters based on real-time signal analysis, transitioning from static fixed-parameter sensing to adaptive dynamic sensing. This allows the system to maintain high detection accuracy across varying arrhythmia types and signal conditions while managing complexity through algorithmic control rather than hardware multiplication.
3Reliability
If fixed sensing threshold control parameters are used, then the ease of operation is improved, but the reliability of therapy delivery deteriorates due to inappropriate sensing in varying cardiac conditions
Solution Approach 1:
The sensing system automatically adjusts its own control parameters (sensitivity, amplitude, timing intervals) based on real-time analysis of cardiac electrical signals and detected arrhythmia patterns. This self-adjusting capability eliminates the need for manual parameter tuning by operators while ensuring reliable therapy delivery across varying cardiac conditions, as the system autonomously optimizes sensing parameters for each specific physiological state.
Solution Approach 2:
The system continuously monitors cardiac electrical signals and uses this feedback to dynamically adjust sensing control parameters. By incorporating real-time feedback from signal analysis and arrhythmia detection, the system automatically adapts parameters to maintain optimal sensing performance, ensuring reliable therapy delivery without requiring manual intervention or complex operator expertise.
Data Source
AI summary
A medical device processor is configured to receive a first cardiac electrical signal sensed from a first sensing electrode vector, receive a second cardiac electrical signal sensed from a second sensing electrode vector different than the first sensing electrode vector, and construct a third cardiac electrical signal from the first cardiac electrical signal and the second cardiac electrical signal. In some examples, the system determines sensed cardiac events according to at least one setting of a cardiac event sensing threshold control parameter from at least the third cardiac electrical signal and may determine at least one acceptable setting of a sensing control parameter based on the determined sensed cardiac events. The processor may generate an output representative of the determined sensed cardiac events.