Patient monitoring devices and systems

A nerve monitoring system comprising

• an input port configured to receive a plurality of time varying electrical signals from one or more electrodes in a non-invasive electrode array;
• a comparator in electrical communication with the input port;
• a processor in electrical communication with the comparator;
• a display device in electrical communication with the processor;
• and
• a memory device storing a plurality of instructions which, when executed by the processor, cause the processor to operate with the display device and the comparator to:
• (a) control the comparator and cause it to compare one or more of the plurality of time varying electrical signals to one or more baseline signals;
• (b) determine when a deviation between a baseline signal and one or more received signals from the electrode array exceeds an alarm threshold;
• and control the display device such that an alarm signal is displayed when the alarm threshold has been exceeded,
• wherein the non-invasive electrode array comprises a wristband, the wristband comprising:
• a first pair of electrodes,
• a second pair of electrodes,
• a third pair of electrodes, and
• an elongate flexible substrate, said first, second, and third electrode pairs disposed in or on the flexible substrate,
• wherein said first electrode pair, second electrode pair, and third electrode pair are configured on said first flexible substrate such that when said electrode array is placed on or over a wrist of a patient said first electrode pair is disposed over a radial nerve in the wrist, said second electrode pair is disposed over a median nerve in the wrist, and said third electrode pair is disposed over an ulnar nerve in the wrist, and
• wherein the flexible substrate has one or more demarcations configured to identify a boundary between one or more nerves or bones disposed relative to nerves to assist in proper anatomic placement of said electrode array on or over said wrist of a patient such that said first electrode pair is disposed over said radial nerve in the wrist, said second electrode pair is disposed over said median nerve in the wrist, and said third electrode pair is disposed over said ulnar nerve in the wrist;
• and
• a first electrical lead having an electrode contacting end and a monitoring device contacting end, the electrode contacting end in electrical communication with at least one electrode in the first pair of electrodes, a second electrical lead having an electrode contacting end and a monitoring device contacting end, the electrode contacting end in electrical communication with at least one electrode in the second pair of electrodes, a third electrical lead having an electrode contacting end and a monitoring device contacting end, the electrode contacting end in electrical communication with at least one electrode in the third pair of electrodes.