Multi-Sensor Cardiac Stimulation Optimization
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Solution Overview
Problem
Current cardiac resynchronization therapy (CRT) systems face challenges in optimizing device parameters due to within-patient variation in response to therapy, influenced by factors like activity level, disease progression, and medication, necessitating timely adjustments to achieve therapeutic cardiac hemodynamics.
Innovation Solution
An ambulatory medical device (AMD) that uses multiple sensor metrics to detect worsening cardiac conditions, determining desired stimulation parameters based on temporal responses, and programming the stimulator to deliver targeted therapy, thereby improving CRT delivery by adjusting pacing parameters such as atrial-ventricular delay and left ventricular-right ventricular delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensor metrics are used to detect worsening cardiac conditions, then the precision of therapy optimization is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple sensor metrics (accelerometer, microphone, impedance sensors, temperature sensors) into a unified multi-sensor system that collectively detects worsening cardiac conditions. This merging approach improves detection precision by integrating complementary information from different sensors while managing complexity through centralized processing in the ambulatory medical device.
Solution Approach 2:
The ambulatory medical device is designed with multi-functionality, serving both as a diagnostic tool (detecting worsening cardiac conditions using multiple sensors) and as a therapeutic device (delivering optimized cardiac stimulation). This universal design improves measurement precision across multiple parameters while consolidating functions into a single device rather than requiring separate systems.
2Adaptability or versatility
If stimulation parameters are adjusted based on temporal responses of sensor metrics, then the adaptability of CRT therapy is improved, but the loss of time for parameter optimization increases
Solution Approach 1:
The patent implements a feedback mechanism where the ambulatory medical device continuously monitors sensor metrics (accelerometer, microphone, impedance, temperature), compares them against baseline values, and automatically adjusts stimulation parameters based on detected changes indicating worsening cardiac conditions. This closed-loop feedback system enables real-time adaptability of CRT therapy without requiring manual intervention or prolonged optimization periods.
Solution Approach 2:
The device establishes baseline sensor metric values during initial operation and stores reference stimulation parameters. When detecting worsening conditions, it compares current readings against these pre-established baselines and applies pre-programmed adjustment algorithms to quickly optimize therapy parameters, reducing the time needed for parameter optimization by having reference data and adjustment protocols ready in advance.
3Reliability
If within-patient variation in response to CRT is accounted for, then the reliability of therapeutic effect is improved, but the device complexity increases
Solution Approach 1:
The patent employs dynamic adjustment of stimulation parameters based on real-time sensor data to account for within-patient variations in response to CRT. The system continuously adapts pacing parameters (atrial-ventricular delay, left ventricular-right ventricular delay) according to detected changes in cardiac condition, ensuring reliable therapeutic effect despite varying patient responses. This dynamic approach replaces static, fixed-parameter CRT with adaptive parameter modulation.
Solution Approach 2:
The system systematically varies stimulation parameters (pacing intervals, pulse amplitudes, timing delays) based on sensor metric readings to identify optimal settings for each patient's current physiological state. By implementing structured parameter changes and evaluating their effects through continuous monitoring, the device reliably accounts for within-patient variation without requiring complex manual titration protocols.
Data Source
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AI summary
Devices and methods for improving device therapy such as cardiac resynchronization therapy by determining a value for a device parameter are described. An ambulatory medical device (AMD) can include a sensor circuit to sense a physiological signal and generate two or more signal metrics, and detect an event of worsening cardiac condition using the two or more signal metrics. In response to the detection of worsening cardiac condition, the AMD can determine, for a stimulator, a value of at least one stimulation parameter based on temporal responses of two or more signal metrics. The temporal responses include near-term and long-term responses to the stimulation. The AMD can program the stimulator with the determined parameter value, and generate stimulation according to the determined parameter value to stimulate target tissue.