Automated External Defibrillators, typically known as AEDs, are important life-saving medical devices that are designed to restore a regular heartbeat in the event of a sudden cardiac arrest (SCA). They play a vital role in public health infrastructure, as having an AED readily accessible can drastically increase the chances of survival of SCA victims. Due to the nature and the urgency of Sudden Cardiac Arrests, where every minute counts, having AEDs accessible to the general public can save countless lives.

AED defibrillators are not complex devices to use and have been designed in a way that both medical professionals and non-medically trained individuals can operate them successfully. The lucidity of its usage is showcased in the automated voice instructions that are provided in multiple languages, ensuring that no matter who is available, they could use the device to save a life.

Every AED device contains two major components – adhesive pads called electrodes and the main device that delivers the shock. The operator needs to place the electrodes on the victim’s bare chest. Once attached, the AED will analyze the victim's heartbeat and determine whether a shock is required. If a shock is deemed necessary, the machine will charge automatically and instruct the operator to deliver the shock. This shock can potentially restore a regular heartbeat in the victim.

The role of AEDs in saving lives during critical moments is phenomenal. In a world report, the American Heart Association states that more than 350,000 out-of-hospital sudden cardiac arrests occur annually, and 90 percent of them are fatal. Conversely, survival rates can double or even triple if the victims receive a defibrillator shock within the first 5-7 minutes of cardiac arrest.

Although AED defibrillators cannot replace advanced medical care, they provide immediate intervention to keep the victim alive until professional health support arrives. More importantly, these defibrillators do not cause any harm to non-cardiac arrest victims as the device only delivers a shock when it is necessary.

In conclusion, AED defibrillators are an exemplary advancement in the field of emergency medical technology. There is a growing need for enhanced awareness about their placement in public locations and training people on their usage. By doing so, more lives can be saved from the life-threatening sudden cardiac arrests. This underlines the importance of AED defibrillators and the critical role they play in our society today.