An instrument that utilizes body contact electrodes evaluates the quality of the connections made between the electrodes and the body. An electrode contact quality evaluation circuit performs the quality evaluation, such as by determining contact impedances for the electrodes. The corresponding contact quality of each electrode is conveyed to the user.

A wireless ECG sensor system includes a sensor patch configured to attach to a user. The sensor patch may include a substrate having a positive and a negative electrode, and a passive radio-frequency identification (RFID) transponder carried by the substrate. The RFID may include a first antenna, a non-transitory and non-volatile storage medium in electrical communication with the first antenna, a load modulation switch in electrical communication with the first antenna, and a microcontroller in electrical communication with the first antenna and in data communication with both the storage medium and the load modulation switch. The system may also include an interrogator device having a second antenna configured to wirelessly transmit electromagnetic radiation having a resonant frequency of the first antenna of the sensor patch, and a demodulator configured to measure a voltage amplitude of the electromagnetic radiation wirelessly transmitted by the second antenna.

A cardiac catheter inspection apparatus comprising: an acquiring section (31) which is configured to acquire a first waveform of heart beats during sinus rhythm, and an arrhythmia waveform during arrhythmia; a measuring section (31) which is configured to measure a second electrocardiogram; a first calculating section (32) which is configured to calculate correction coefficients for statistically matching the first electrocardiogram and the second electrocardiogram with each other; a waveform producing section (34) which is configured to produce a comparison waveform that functions as an object to be compared with a response waveform of pacing performed by a cardiac catheter; and a second calculating section (36) which is configured to calculate a matching rate of the response waveform and the comparison waveform.

A method of providing a graphical representation of sleep quality includes obtaining ECG data for a patient, obtaining a plurality of N-N intervals from the ECG data, calculating a plurality of spectral densities based on the plurality of N-N intervals, wherein each spectral density is associated with one of a plurality of successive time windows and is calculated based on certain ones of the N-N intervals associated with the one of the plurality of successive time windows, and generating the graphical representation of sleep quality using the plurality of spectral densities.

An emergency cardiac and electrocardiogram (ECG) electrode placement device is disclosed herein. The emergency cardiac and electrocardiogram (ECG) electrode placement device incorporates electrical conducting materials and elastic material into a pad that is applied to a chest wall of a patient, which places multiple electrodes in the appropriate anatomic locations on the patient to quickly obtain an ECG in a pre-hospital setting.

A physiological signal monitoring system comprising a pendant and a patch. The pendant includes a data store, a processor, and a cellular modem. The patch includes a cradle and electrodes mechanically and electrically connected with a flexible printed circuit board (PCB). When removably coupled with the cradle of the patch, the pendant receives from the electrodes electrical signals from a patient's heart and either stores the signals to the data store or transmits the signals. A single channel patch configuration includes two electrodes positioned at least 8.0 centimeters (CM) apart. A two channel patch configuration employs three electrodes similarly spaced. Removable auxiliary components may connect to the pendant's device interfaces, each configured to receive physiological input such as electromyogram (EMG), electroencephalogram (EEG), body temperature, heart rate, pedometer, blood pressure, pulse oximetry, respiratory rate, posture/body orientation, and sleep monitoring.

An electrocardiogram device configured to transmit at least one signal responsive to a wearer's cardiac electrical activity can include a disposable portion and a reusable portion configured to mechanically and electrically mate with each other. The disposable portion can include a base having at least one mechanical connector portion, a plurality of cables and corresponding external ECG electrodes, and a first plurality of electrical connectors associated with the plurality of cables. The reusable portion can include a cover having at least one mechanical connector portion, a second plurality of electrical connectors configured to electrically connect with the first plurality of electrical connectors of the disposable portion, and an output connector port configured to transmit at least one signal responsive to one or more signals outputted by the external ECG electrodes of the disposable portion.

A wearable instrument is provided that measures biological information over an extended period of time by enabling an electrode to be readily pressed to an axilla of an animal. The wearable instrument includes: electrodes to be placed under the left and right axillae of a dog to produce an electrocardiogram; pull-up straps to be placed in direct contact with the axilla to press the electrodes onto the axilla; and a cinch strap placed across the anterior chest of the dog to draw the left and right sections of the pull-up strap together.

A patient worn sensor assembly for detecting, recording, and communicating patient vital signs can be integrated into a garment to be worn by the patient. A lead assembly can be integrated into a garment to connect electrodes in contact with the skin of a patient to a sensor assembly that collects vital sign information from the electrodes. The lead assembly can be multi-layered and can include, for example, two outer anti-static satin fabric layers as top and bottom layers, muslin fabric insulator layers adjacent to the anti-static satin fabric layers, shield layers that include muslin with silver fabric adjacent to the insulator layers, and an inner layer of fabric with conductive thread (or alternatively conductive thread not integrated with other fabrics, or a layer that is substantially composed of conductive thread).

A data collection unit obtains physiological data from a subject interface on a subject. The subject interface can be connected to the data collection unit. When the subject interface is connected to the data collection unit, subject interface contacts on the subject interface make contact with data collection unit contacts on the data collection unit. Some of the data collection unit contacts are for communicating physiological data from the subject interface to the data collection unit. Some of the contacts are for powering the data collection unit upon the subject interface being connected to the data collection unit and for powering down the data collection unit upon the subject interface being disconnected from the data collection unit.