Subcutaneous ICD Wireless Cardiac Sensor
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Solution Overview
Problem
Subcutaneous implantable cardioverter defibrillators (SubQ ICDs) face challenges in rhythm and arrhythmia sensing due to the absence of endocardial or epicardial electrodes, leading to limited atrial signal detectability and interference from muscle movement and environmental noises.
Innovation Solution
A separate cardiac rhythm sensor positioned on or close to the heart senses electrical or mechanical heart activity and transmits signals wirelessly to the SubQ ICD, enabling improved arrhythmia detection and therapy delivery using subcutaneous electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If subcutaneous electrodes are used without endocardial or epicardial leads, then the device complexity is reduced and ease of operation is improved, but the measurement precision of arrhythmia detection deteriorates due to signal interference and limited detectability
Solution Approach 1:
A separate cardiac rhythm sensor is introduced as an intermediary device positioned on or close to the epicardium. This sensor captures high-quality cardiac signals and transmits them wirelessly to the SubQ ICD, serving as a mediator that bridges the gap between the heart and the subcutaneous device, thereby resolving the contradiction by enabling accurate detection without requiring endocardial leads
Solution Approach 2:
The system is segmented into two independent components: a separate cardiac rhythm sensor positioned on the epicardium and a SubQ ICD implanted subcutaneously. This segmentation allows each component to perform its specific function optimally - the sensor for accurate signal capture and the ICD for therapy delivery - while reducing the complexity of the overall system compared to traditional lead-based ICDs
2Device complexity
If subcutaneous electrodes are used, then the device complexity is reduced, but the reliability of rhythm sensing deteriorates due to interference from muscle movement, respiration, and environmental noises
Solution Approach 1:
The separate cardiac rhythm sensor acts as an intermediary that captures cardiac signals directly from the epicardium, isolating the signal acquisition function from the noisy subcutaneous environment. This mediator approach allows reliable rhythm sensing while maintaining low device complexity in the SubQ ICD itself
Solution Approach 2:
The signal sensing function is extracted from the SubQ ICD and placed in a separate cardiac rhythm sensor positioned on the epicardium. This extraction removes the sensing function from the noisy subcutaneous environment, thereby improving reliability while maintaining the simplicity of the SubQ ICD device
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
Enhances the ability to detect arrhythmias and deliver appropriate therapy by providing clearer cardiac signals, reducing interference and improving the accuracy of rhythm sensing and treatment in SubQ ICDs.
Implementation Method 1
The cardiac rhythm sensor senses electrical or mechanical activity of the heart
Implementation Method 2
transmits a signal wirelessly to the SubQ ICD
Data Source
AI summary
A cardiac rhythm sensor positioned on or close to the heart senses electrical or mechanical activity and transmits a cardiac rhythm signal wirelessly to a subcutaneous ICD. Arrhythmia detection and delivery of therapy are performed by the SubQ ICD based upon the cardiac rhythm signal received from the sensor.