Wearable Cardioverter Defibrillator Demand Pacing for Bradycardia
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Solution Overview
Problem
Current wearable cardioverter defibrillators (WCDs) do not provide management and delivery of transcutaneous pacing therapy for conditions like bradycardia or asystole, which are critical cardiac issues.
Innovation Solution
A medical system with a support structure, ECG electrodes, and a processor that operates in a demand pacing function, including a fixed pacing mode and an intrinsic search pacing mode, delivering transcutaneous pacing pulses based on the patient's intrinsic heart rate, adjusting pacing rates to minimize external intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current WCDs provide defibrillation therapy, then life-threatening arrhythmias can be treated, but transcutaneous pacing therapy for bradycardia and asystole cannot be provided
Solution Approach 1:
The WCD is enhanced to provide multiple cardiac therapies including both defibrillation for tachyarrhythmias and transcutaneous pacing for bradycardia/asystole. The device integrates a demand pacing function with intrinsic search capability, allowing it to adapt to different cardiac conditions and deliver appropriate therapy types based on the detected arrhythmia type.
2Reliability
If external pacing pulses are delivered continuously, then heart rate is maintained, but intrinsic heart activity is suppressed
Solution Approach 1:
The demand pacing function continuously monitors the patient's intrinsic heart rate via ECG electrodes and adjusts pacing delivery accordingly. Pacing pulses are delivered only when the intrinsic heart rate falls below a predetermined threshold, creating a feedback-controlled system that maintains heart rate while preserving intrinsic cardiac activity whenever possible.
Solution Approach 2:
The pacing system dynamically adjusts its operation based on real-time detection of intrinsic heart activity. The intrinsic search function allows the device to transition between paced and intrinsic beats, adapting the pacing strategy to optimize both heart rate maintenance and preservation of natural cardiac rhythm.
3Adaptability or versatility
If demand pacing function is added to WCD, then pacing therapy is provided, but device complexity increases
Solution Approach 1:
The demand pacing function is integrated into the existing WCD architecture, sharing common components such as ECG electrodes, processor, and energy source with the defibrillation function. This merging approach allows addition of pacing capability while minimizing incremental complexity by utilizing already-present device elements for dual purposes.
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
The system effectively provides transcutaneous pacing only when needed, preserving the patient's intrinsic heart activity by dynamically adjusting pacing rates, thus addressing the limitations of existing WCDs in managing bradycardia and asystole.
Implementation Method 1
a plurality of ECG electrodes to sense one or more ECG signals of the patient
Implementation Method 2
at least one therapy electrode...configured to deliver one or more pacing pulses to the patient
Data Source
AI summary
A medical system including a support structure to be worn by a patient, a plurality of ECG electrodes to sense ECG signals of the patient, at least one therapy electrode to deliver pacing pulses, and a processor in communication with the plurality of ECG electrodes and the at least one therapy electrode. The processor operates the medical system according to a demand pacing function, including a fixed pacing demand mode and an intrinsic search pacing demand mode. In the intrinsic search pacing demand mode, the processor operates the demand pacing function at a maximum pacing rate for a first time interval, followed by a minimum pacing rate during an intrinsic search duration, and evaluates heart activity via ECG signals to determine if it exceeds a threshold. In the fixed pacing demand mode, the processor operates the demand pacing function at a fixed pacing rate.