Biopotential Skin Electrodes

• Stable, low noise measurements

• Low artifact susceptibility

• Integral or snap lead wires

• Easily attached

• Tough and Durable

Gereonics Biopotential Skin Electrodes transmit stable and clean signals for precise physiological measurements.

Applications include ECG, EOG, ENG, EMG, EEG, GSR, and evoked potentials.

Cleaning Electrodes...

Immediately after removing the electrode, take off the adhesive washer and wash out the gel or cream using distilled or deionized water. A plastic wash bottle with squirt tip is very suitable. Never use tap water. A cotton swab can be used to remove the main bulk of the gel or cream. Soak the electrode in a mild saline solution until the next application. Your lab or hospital may have normal saline solution available in prepared bottles. Do not let the old gel or cream dry or harden in the cavity.

Other Cleaning Tips...

If electrodes are used only occasionally, a brown coating may form over the sensing element. This can be removed by wiping with a mild ammonium hydroxide solution or by lightly abrading with a very thin strip of 200 mesh emery cloth.

Electrodes will turn black if continuously exposed to bright light. The finely divided silver in the electrode pellet oxidizes to silver oxide (black) much like a photographic negative. The electrode will perform normally even when the appearance is almost jet black. Cleaning by abrasion to remove the oxide layer is appropriate, however. Store electrodes in use in a dark drawer or a closed opaque box.

Electrodes can be permanently damaged (poisoned) when only small amounts of bromide, sulfide and other metal ions are present. Do not expose the electrodes to tap water, EEG pastes containing abrasive clays, miscellaneous soap solutions or abrasive cleaners.

Disinfection...

This procedure is one of the methods endorsed by the Board of Trustees of the American Society of Electroneurodiagnostic Technologists (Am. J. EEG Technol. 35: 3-36, 1995). The sodium hypochlorite procedure is the simplest, safest and most economical method for “high level disinfection”. Gereonics electrodes are unaffected by dozens of disinfections using this method.

1. Purchase 5.25% sodium hypochloride (NaOCl) as household Clorox or Purex bleach. There are a plethoraof “bleach” solutions containing detergents and other additives. Obtain only pure bleach containing 5.25% NaOCl and water.
2. This bleach solution can be used as a high level disinfectant for Gereonics electrodes using a 1:50 (1000 ppm) dilution of 5.25% sodium hypochlorite for a period of twenty minutes when mixed fresh and used within 24 hours. A 1:50 dilution means to add one part bleach solution to 49 parts of distilled or deionized water; for example, 2cc of bleach to 98cc of water.
3. When electrodes have soaked for twenty minutes, remove from the diluted (1000 ppm) bleach solution, rinse the electrodes off using a deionized or distilled water spray bottle and immerse them in a normal saline solution. The electrodes will return to very acceptable Noise and DC Offset Voltage levels in 90 minutes, i.e. suitable for use. Do not soak electrodes in the diluted bleach solution for extended periods of time as the oxygen will cause a blackening of the electrode. This does not affect electrode performance. Please consult with Gereonics if you wish to use other disinfection procedures.

Sterilization...

Gereonics silver/silver chloride electrodes may be sterilized using the low temperature peroxide sterilization method. This utilizes the STERRAD 100 Sterilizer from Advanced Sterization Products, a Johnson & Johnson Company.

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Electrodes Catalog and Price List

Adhesive Washers utilize a time tested adhesive to attach electrodes securely to the skin. The washers have double sided adhesive and are hypo-allergenic.