Implantable Heart Sound Detector for S3 Monitoring
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Solution Overview
Problem
Current cardiac rhythm management systems lack effective detection and analysis of the third heart sound (S3), which is indicative of heart failure and related to ventricular diastolic filling pressures and stiffness, necessitating a system for accurate S3 detection and monitoring.
Innovation Solution
A cardiac rhythm management system incorporating an implantable sensor, such as an accelerometer or microphone, to detect S3 by generating S2 and S3 windows within the cardiac cycle, allowing for the detection of S3 activity through comparison with dynamically adjustable thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an implantable sensor is used to detect heart sounds, then the ability to detect S3 is improved, but the device complexity increases
Solution Approach 1:
The patent integrates the acoustic sensor, signal processing circuitry, and control functions into a single implantable medical device (IPD). The sensor is nested within the device housing, and the processing electronics are contained within the same implantable unit, creating a compact integrated system that detects and analyzes heart sounds without requiring external equipment.
Solution Approach 2:
The implantable device performs multiple functions: it detects heart sounds using an acoustic sensor, processes the signals to identify S3 waves, monitors cardiac rhythm, and provides therapeutic control. This multi-functional approach consolidates what could be separate systems into one device, improving S3 detection capability while managing overall system complexity.
2Measurement precision
If dynamically adjustable thresholds are used for S3 detection, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent implements dynamically adjustable detection thresholds that adapt based on the patient's physiological state and signal characteristics. The system automatically adjusts threshold levels to accommodate variations in heart sound intensity, frequency, and timing patterns, thereby maintaining high detection accuracy across different cardiac conditions without requiring manual recalibration.
Solution Approach 2:
The signal processing system incorporates feedback mechanisms where detected heart sound patterns are used to refine and adjust detection thresholds. The system analyzes the acoustic signal characteristics in real-time and modifies threshold parameters based on the observed signal-to-noise ratio and pattern recognition results, improving detection precision through adaptive feedback control.
3Reliability
If S3 detection windows are generated after each S2 detection, then the detection reliability is improved, but the loss of time in processing increases
Solution Approach 1:
The patent pre-defines the temporal window for S3 detection based on the expected physiological timing relationship between S2 and S3 heart sounds. When S2 is detected, the system immediately activates a pre-configured detection window at the appropriate time interval, allowing for rapid S3 identification without requiring complex real-time analysis or extended processing periods.
Solution Approach 2:
The cardiac cycle is segmented into distinct phases with specific detection windows for different heart sounds. The system divides the continuous acoustic signal into discrete time segments corresponding to expected S1, S2, and S3 occurrences, allowing for efficient targeted analysis of each segment rather than processing the entire continuous signal stream.
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
Enables the generation of an S3 index, a ratio of S3 beats to total heart beats, providing a trend indicative of heart failure and allowing for timely intervention in elevated filling pressures and restrictive filling conditions.
Implementation Method 1
An implantable sensor, such as an accelerometer or a microphone, senses an acoustic signal indicative heart sounds including the second heart sounds (S2) and S3
Data Source
AI summary
A cardiac rhythm management system includes a heart sound detector providing for detection of the third heart sounds (S3). An implantable sensor such as an accelerometer or a microphone senses an acoustic signal indicative heart sounds including the second heart sounds (S2) and S3. The heart sound detector detects occurrences of S2 and starts S3 detection windows each after a predetermined delay after a detected occurrence of S2. The occurrences of S3 are then detected from the acoustic signal within the S3 detection windows.