What material is used in ECG electrodes?

ECG electrodes are typically made from silver/silver chloride (Ag/AgCl).

Some key things to know about ECG electrode materials:

– Silver provides good conductivity to pick up electrical signals from the skin.

– Chloriding the silver (combining it with chloride) prevents the silver from being oxidized and degraded over time.

– Ag/AgCl provides low offset voltage and low noise interference for clean ECG signals.

– Other materials like gold, platinum, or stainless steel can also be used, but silver/silver chloride is the most common choice for optimal signal quality.

– The electrodes have a conductive gel applied to help transmit signals from the skin by reducing skin impedance.

– Adhesive layers, foams, and other materials are used for electrode backing and adhesion to the skin.

So in summary, ECG electrodes mainly rely on silver/silver chloride to conduct electrical impulses from the heart to produce the ECG trace, while additional components improve adhesion and connectivity.

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