Abstract: The present invention provides an electrode system and lead assembly for linking one or more electrodes to a physiological monitoring device. In general, the lead assembly comprises one or more lead sets and one or more lead links. The lead set generally comprises one or more leads each coupled at one end to a set connector, and at an other end, each coupled or adapted to be coupled to a respective electrode of the electrode system. The lead link generally comprises a link connector and one or more link leads operatively coupled thereto, each set lead being operatively coupleable to a corresponding link lead via direct or indirect operative coupling of the set connector and the link connector. Each link lead is further adapted to be coupled to one or more physiological monitoring devices, either by direct connection via a common or distinct connector(s) integral to the lead link, or by indirect connection via one or more additional connectors.

Abstract: A chronic subdermal silver-silver/chloride (Ag—Ag/Cl) electrode for the recording of biopotentials is disclosed. The electrode is comprised of an Ag—Ag/Cl distal end that is placed subdermally by various methods. The recording electrode is made of solid, multi-stranded or a ball of pure silver and the whole length of the electrode is insulated except for the distal end which is used for voltage recordation. The electrode can be placed subdermally by an introducer apparatus such as hypodermic or sewing needle, a split-cannula, a staple, or a suture. Once placed, the introducer apparatus can be removed leaving the recording wire/element in place. The recording electrode can be placed at any location on the body to record the local biopotential (EEG, EOG, EMG, EKG, etc). It can be left in place for hours, days, or weeks, as it will record without any further adjustment.