There are many medical equipment supplies, such as the defibrillator that you can find by simply searching online. A defibrillator is a medical device used in the defibrillation of the heart. It consists of a central unit and a set of two electrodes.

It is a complicated mechanism.  The central unit provides a source of power and control. The two electrodes are placed directly on or in the patient. The device is designed to deliver an electric shock to the patient, in an effort to stop ventricular fibrillation or pulse less ventricular tachycardia. It is also used to stop the heart in an effort to allow it to reset its natural pacemaker in supra ventricular tachycardia. Ventricular fibrillation is a situation of electrical chaos in the heart's conduction system, in essence distorting the coordinated contraction of cardiac muscular tissue.

This leads to a situation where the heart produces minimal or no forward blood flow, causing circulatory arrest and death within minutes from hypoxic brain damage. The defibrillation current depolarizes the entire electrical system of the heart causing a complete cessation of electrical activity.

This, in turn, gives the opportunity of impulses from the normal conduction pathways to regain control of the muscular tissue of the heart. Until recently, external defibrillators relied on monophasic shock waves. Electrical pulses are sent rapidly from one electrode to the other, only in one direction. Biphasic defibrillation, however, alternates the direction of the pulses, completing one cycle in approximately ten milliseconds. Biphasic defibrillation was originally developed and used for implantable cardioverter-defibrillators. When applied to external defibrillators, biphasic defibrillation significantly decreases the energy level necessary for successful defibrillation. This, in turn, decreases risk of burns and myocardial damage.

However, there is limited evidence to suggest that biphasic defibrillation is superior to monophasic defibrillators, although the small capacitor size required for the defibrillator can result in significant cost and size savings.

External defibrillators are used in hospitals or ambulances, but are increasingly common outside the medical realm, as automated external defibrillators become safer and cheaper. There are a variety of technologies and form factors in use for external defibrillators, and recent progress in cardiac research has led to substantial improvements in the underlying technology.

The device may be implanted directly in the user of the device. If so, it is known as an implantable cardioverter-defibrillator (ICD). This type of defibrillator is designed to provide immediate defibrillation to high-risk patients.

By actively monitoring the pulse rate, rhythm, and waveform, and by comparing atrial and ventricular activity, an ICD can detect ventricular fibrillation, and immediately initiate defibrillation.

A public access automated external defibrillator in Monaco can be used by bystanders.  An Automated External Defibrillator (AED) is a self-contained defibrillator device designed for portability and ease of use. AEDs are generally shaped like a briefcase, so that they may be carried easily by a handle. An AED contains a battery, a control computer, and electrodes.