A system and method for a multi-function remote ambulatory cardiac monitoring system. The system includes a housing and a microprocessor disposed within the housing. The microprocessor controls the remote ambulatory cardiac monitoring system. The system also includes an electrode for sensing ECG signals and the electrode being in communication with the microprocessor. An integrated cellular module also is included in the system, and the cellular module is connected to the microprocessor and disposed within the housing. The integrated cellular module transmits ECG signals to a remote center.

A data acquisition system for use with expandable ECG electrode systems. The data acquisition system includes a main unit and one or more expansion units for increasing the number of ECG leads applied to a patient for enhanced monitoring capabilities. Multiple embodiments are illustrated for providing a common mode signal between the main electrode unit and expansion units without requiring the physical transmission of voltage potential between the main unit and the expansion unit. In one embodiment, the main unit and the expansion unit share a common ground reference potential. In a second embodiment, an optical signal is transmitted between the main unit and the extension unit to relay the common mode information while in a third embodiment, common electrode potentials are provided to both the main unit and the extension unit for constructing their own common reference signal.

Provided is a wireless 12-lead or multiple unipolar-lead electrocardiograph system without cable connection between a measurement electrode and device body. The present invention includes: a measurement electrode that acquires an electrocardiographic signal of a subject 150; a Wilson terminal 180 that is connected to the measurement electrode and forms an indifferent electrode; and an electrocardiograph body 300 that generates an electrocardiogram. The measurement electrode has: active measurement electrodes 200A-200F, 200H, 200J that wirelessly communicate with the electrocardiograph body 300; and passive measurement electrodes 200G, 200I that are connected to the active measurement electrodes 200A-200F, 200H, 200J and the Wilson terminal 180. The electrocardiograph body 300 generates the electrocardiogram on the basis of a lead signal sent by the active measurement electrodes 200A-200F, 200H, 200J.

Hat, helmet, and other headgear apparatus includes dry electrophysiological electrodes and, optionally, other physiological and/or environmental sensors to measure signals such as ECG from the head of a subject. Methods of use of such apparatus to provide fitness, health, or other measured or derived, estimated, or predicted metrics are also disclosed.

This disclosure relates to integrated channel integrity detection and to reconstruction of electrophysiological signals. An example system includes a plurality of input channels configured to receive respective electrical signals from a set of electrodes. An amplifier stage includes a plurality of differential amplifiers, each of the differential amplifiers being configured to provide an amplifier output signal based on a difference between a respective pair of the electrical signals. Channel detection logic is configured to provide channel data indicating an acceptability of each of the plurality of input channels based on an analysis of a common mode rejection of the amplifier output signals.

A sensor interface is configured to receive a sensor signal. A transmitter generates a transmit signal. A receiver receives the signal corresponding to the transmit signal. Further, a monitor interface is configured to communicate a waveform to the monitor so that measurements derived by the monitor from the waveform are generally equivalent to measurements derivable from the sensor signal.

Biometric identification methods and apparatuses (including devices and systems) for uniquely identifying one an individual based on wearable garments including a plurality of sensors, including but not limited to sensors having multiple sensing modalities (e.g., movement, respiratory movements, heart rate, ECG, EEG, etc.).

This disclosure provides cascaded reference circuits and low amplitude signal sensing circuits used to perform a Subsurface Spectrogram (SSG). The Subsurface Spectrogram can detect the conductive properties of skin and the underlying tissues. The conductive properties inform what electrolytes and moisture levels are present, which in turn can provide information about the physiological state of the mammal. The Subsurface Spectrogram uses an arbitrary waveform generator to provide a reference signal, the return signals are captured and compared to their original characteristics for changes in amplitude, phase and frequency. From these calculations insight into the amount of skin moisture and electrolyte configuration can be gained. Embodiments of such systems may be especially useful in health and fitness wearable devices where feedback on health and exercise can help mammals achieve an optimal workout, or help them to know when they are experiencing unhealthy stress levels. Methods are provided for using the devices of this disclosure to privately alert wearers to an increase in bad stress in the moment when they can take actions to reduce their physiological stress responses. These devices are useful for measuring and increasing the effectiveness of relaxation techniques. As a result of using methods and devices of this disclosure, people are healthier, they make more responsible decisions, and relationships improve.

Medical catheterization is carried out by receiving a plurality of analog bioelectric signals in respective channels and multiplexing the bioelectric signals in respective selection events. The selection events consist of making a first connection with a reference voltage, thereafter breaking the first connection and making a second connection with one of the bioelectric signals. The method is further carried out by outputting the multiplexed bioelectric signals to an analog-to-digital converter.

A basket-type EP catheter is described. The EP catheter comprises a catheter proximal end that is electrically connected to a controller by an electrical cable having a single voltage-out (Vout) conductor and a catheter distal end supporting a distal connector that is detachably connectable to a basket-shaped configuration of a plurality of splines. Each spline supports an array of electrodes. By sampling the voltage signal on each of the plurality of electrodes sequentially or consecutively, only one Vout conductor is needed to transmit the voltage sample to the controller. In comparison to conventional EP catheters, this greatly reduces the number of conductors extending along the catheter shaft. The use of a Vout conductor is implemented by connecting a polling circuit or a one-shot circuit and a signal pass-transistor or transmission gate to each electrode.