Wearable Defibrillator Multi-Sensor Shock Confirmation
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Solution Overview
Problem
Wearable cardioverter defibrillator (WCD) systems face challenges in accurately distinguishing between true and false shockable events, leading to unnecessary shocks and discomfort for patients, due to the limitations in sensitivity and specificity of existing detection methods.
Innovation Solution
The integration of multiple sensor modules that monitor various physiological parameters in conjunction with an electrocardiogram (ECG) to provide a multi-sensor interface and processor-based decision-making, enhancing the specificity of shock detection by using primary and secondary shock criteria to determine whether a shock is necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensitivity of detection is increased to correctly identify cardiac rhythms requiring shock, then more shockable events are detected, but more false shockable events are also identified leading to unnecessary shocks
Solution Approach 1:
The shock detection process is segmented into multiple independent criteria: primary shock criterion (ECG analysis) and secondary shock criterion (additional physiological parameters). This segmentation allows the system to divide the detection task into separate evaluable components, reducing false positives by requiring multiple criteria to be satisfied simultaneously before delivering a shock.
Solution Approach 2:
The system changes from relying on a single detection parameter (ECG) to multiple physiological parameters (including but not limited to ECG, respiratory rate, motion). By expanding the parameter set used for detection, the system maintains high sensitivity for true shockable events while improving specificity to filter out false alarms.
2Object-affected harmful factors
If patient assistance is required to clear falsely identified events using a button or alarm, then false shocks can be prevented, but patient comfort and ease of operation deteriorate due to distraction and interruption
Solution Approach 1:
The system performs self-verification by automatically evaluating multiple physiological parameters to confirm or refute shockable events. Instead of requiring patient intervention, the system independently validates detections through secondary criteria (respiratory rate, motion sensors), eliminating the need for patient distraction while maintaining high accuracy in distinguishing true from false events.
Data Source
AI summary
A wearable cardioverter defibrillator (“WCD”) system includes a support structure that can be worn by a patient, and a defibrillator coupled to the support structure. An ECG input, rendered from an ECG of the patient, may meet a primary shock criterion. One or more sensor modules are further provided, which are worn by the patient at different times. The sensor modules may monitor different physiological parameters of the patient, and transmit signals about them. The WCD system further has a multi-sensor interface to receive the transmitted signals, and a processor to determine from them whether a secondary shock criterion is met. If both the primary and the secondary shock criteria are met, the decision is to shock. The signals increase specificity of the detection, while the patient can wear different modules depending on context.