Väliselektrood

Väliselektrood refers to an external electrode used in various electrical and medical applications. In a general electrical context, it is a conductive element that is positioned outside a system or device to facilitate the flow of electrical current or to detect electrical signals. This external placement distinguishes it from internal electrodes that are integrated within a device's circuitry.

In the field of medicine, particularly in electrophysiology, väliselektrood plays a crucial role. These electrodes are typically placed on the skin's surface to record electrical activity of the body. Examples include electrocardiogram (ECG) electrodes, which detect the heart's electrical impulses, and electroencephalogram (EEG) electrodes, which measure brain activity. Unlike internal electrodes that might be surgically implanted, väliselektrood are non-invasive, making them suitable for routine monitoring and diagnostic procedures.

The material composition of a väliselektrood is important for its function. Common materials include silver, silver chloride, and various conductive polymers, chosen for their ability to efficiently conduct electrical signals and minimize impedance. The design and size of väliselektrood can vary widely depending on the specific application, from small, disposable adhesive patches for ECG to larger cup-shaped electrodes for EEG. Proper placement and good skin contact are essential for obtaining accurate and reliable readings from these external measurement tools.