Pocket-Sized AED Using Segmentation and Mechanics Substitution
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Solution Overview
Problem
Conventional Automated External Defibrillators (AEDs) are bulky, intimidating, and often not readily available in homes of individuals at risk for heart disease, leading to delayed defibrillation therapy during cardiac emergencies, with up to 20% being non-functional due to lack of noticeable maintenance alerts.
Innovation Solution
A portable, pocket-sized AED device with a high voltage capacitor, DC/DC converter circuit, H-bridge circuit, and microprocessor, integrated with compact defibrillator pads and a power handler circuit for continuous battery monitoring and self-test capabilities, providing voice prompts for user guidance and maintenance alerts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional AEDs are placed in public places, then they are accessible to people, but they are bulky and intimidating which discourages use
Solution Approach 1:
The AED device is divided into two main segments: a pocket-sized main unit that can be carried personally, and separate defibrillator pads that are applied to the patient. This segmentation allows the control electronics and power supply to be miniaturized and portable, while the pads can be larger to ensure proper contact with the patient's chest.
Solution Approach 2:
The patent replaces the traditional large mechanical cabinet housing with a compact integrated design where electronic components are mounted on a small circuit board within a portable housing. This substitution of the mechanical structure with a more compact electronic integration dramatically reduces the device volume while maintaining functionality.
2Ease of operation
If conventional AEDs are wall-mounted in cabinets, then they are protected and secure, but alarms increase anxiety and discourage Good Samaritans
Solution Approach 1:
The alarm and cabinet monitoring systems are extracted from the essential defibrillation function. The patent simplifies the user interface to focus only on the critical defibrillation task, removing complex alarm systems that may confuse or intimidate users during an emergency.
Solution Approach 2:
The device includes automatic self-diagnosis and status monitoring capabilities that eliminate the need for complex manual checks or external monitoring systems. The AED automatically tracks its own operational status, battery life, and component functionality, providing simple status indicators rather than complex alarm systems.
3Reliability
If conventional AEDs are deployed widely, then more people have access to them, but up to 20% are non-functional due to lack of maintenance alerts
Solution Approach 1:
The patent implements comprehensive feedback systems including automatic self-diagnosis that continuously monitors device status, battery charge levels, and component functionality. The system provides real-time feedback through simple status indicators and maintains logs of operational parameters, enabling users to quickly identify when maintenance is needed without complex diagnostic procedures.
Solution Approach 2:
The AED performs automatic built-in self-tests that monitor its own operational status, battery health, and component functionality. This self-service capability ensures the device remains functional by automatically detecting and alerting to maintenance needs, eliminating the need for external monitoring systems or complex diagnostic tools.
4Reliability
If defibrillation therapy is delayed until EMS arrival, then professional care is provided, but survival chances decrease by 10% per minute
Solution Approach 1:
The patent enables preliminary defibrillation action by making the device portable and personally carryable. The AED is designed to be activated immediately by bystanders at the scene of cardiac arrest, eliminating the waiting period for EMS arrival. The device requires minimal training and provides step-by-step guidance, enabling immediate life-saving intervention before professional medical services arrive.
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
Enables timely and effective defibrillation therapy in home settings by being compact, user-friendly, and maintaining functionality through continuous monitoring and self-test features, reducing the risk of delayed treatment and device malfunction.
Implementation Method 1
a DC/DC converter circuit comprising a high voltage transformer (HV XFMR), a field effect transistor (FET) switch with associated driver, and a rectifying diode, preferably configured to increase the battery voltage to about 2000 volts
Implementation Method 2
a high voltage capacitor (HV Cap) configured to store the energy required to deliver a defibrillation shock to a patient
Implementation Method 3
an H-bridge circuit configured to transform energy released from the HV Cap into a bi-phasic pulse
Data Source
AI summary
Automated External Defibrillator (AED) devices may include a high voltage capacitor (HV Cap) configured to store energy required to deliver a defibrillation shock to a patient; batteries configured to charge the HV Cap; a DC/DC converter circuit including a high voltage transformer, a FET switch with associated driver, and a rectifying diode; an H-bridge circuit configured to transform energy released from the HV Cap into a bi-phasic pulse; and a memory and microprocessor configured to operate the AED device. In particular, the HV Cap, the DC/DC converter circuit, the H-bridge circuit, the one or more batteries, and the memory and the microprocessor may contained in a pocket-sized housing, the AED device may be configured to continuously monitor and adjust the rate at which the batteries charge the HV Cap, and the AED device may include a variable frequency relaxation oscillator circuit configured to acquire a patients Z-body measurement.