Case-Opening AED Circuitry for Disposable Defibrillator Readiness
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Solution Overview
Problem
Conventional public access automated external defibrillators (AEDs) are bulky, costly, and complex, making them impractical for widespread personal use and often unavailable during sudden cardiac arrest (SCA) emergencies, which occur predominantly at home or during daily activities, leading to high mortality rates due to delayed access and improper use by untrained rescuers.
Innovation Solution
A compact, pocket-sized, single-use AED with de-energizable circuitry that includes a housing for electronic components and electrode pads, allowing rapid deployment by intuitive user actions, and featuring a microcontroller unit with error detection to prevent computational errors, ensuring immediate and reliable defibrillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional public access AEDs are designed for reusability and constant readiness, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The AED circuitry is energized periodically through case opening rather than continuously, performing self-testing only when activated by opening the case. This periodic activation reduces component wear and extends battery life while maintaining reliability when needed.
Solution Approach 2:
The patent describes a single-use AED design where the device is intended for one use only. After use, the entire device is discarded rather than reused. This eliminates the need for complex reusability features, constant self-testing circuits, and extensive maintenance systems, significantly reducing device complexity and cost.
2Reliability
If conventional AEDs perform constant self-testing, then reliability is improved, but battery depletion accelerates
Solution Approach 1:
Self-testing is performed periodically when the case is opened rather than continuously. The microcontroller activates the circuitry only at these periodic intervals to perform necessary tests, significantly reducing battery consumption while maintaining functional reliability when the device is activated.
3Ease of manufacture
If conventional AEDs are designed for multiple uses, then cost-effectiveness is improved, but device size and weight increase
Solution Approach 1:
The AED is designed as a single-use disposable device. By eliminating the need for reusability features, robust multiple-use components, and extensive maintenance systems, the device weight is significantly reduced while maintaining cost-effectiveness through simpler manufacturing and lower material requirements.
4Ease of operation
If conventional AEDs are made pocket-sized, then availability is improved, but energy storage capacity is reduced
Solution Approach 1:
As a single-use device, the AED only needs sufficient energy storage for one defibrillation event rather than multiple uses. This allows the use of smaller, lighter battery and capacitor components while maintaining adequate energy capacity for the intended single use, achieving pocket-sized portability.
Data Source
AI summary
A defibrillation assembly energizable through case opening is provided, including an electromechanical component; an energy storage element that supplies power to the component; circuitry configured to generate one or more defibrillation waveforms, wherein the circuitry is isolated from the energy storage element by the element; and a case within which at least a portion of the circuitry is located, the case including a cover and an electrode enclosure within which electrode pads for delivery of the waveforms are stored, wherein an opening of the case that includes a removal of the cover causes the power to flow to the circuitry through the component, wherein the circuitry includes a microcontroller unit configured to determine whether the flow of the power was accidental based on a time during which the microcontroller unit receives the power and to power down the circuitry upon making the determination the flow was accidental.