A monitor that includes multiple detection channels having multiple input ports for receiving a group of electrical physiological signals from a person; wherein multiple switching circuits of the monitor are configured according to a first configuration when the monitor operates in a first mode, thereby causing each electrical physiological signal of the group to be processed by up to a single selected detection channel of the multiple detection channels; wherein the multiple switching circuits of the monitor are configured according to a second configuration when the monitor operates in a second mode thereby causing one or more of the multiple electrical physiological signals of the group to be processed by at least two selected detection channels of the multiple detection channels.

A wearable cardioverter defibrillator system includes a support structure that a patient can wear. The system also includes electrodes that contact the patient, and define two or more channels from which ECG signals are sensed. A processor may evaluate the channels by analyzing their respective ECG signals, to determine which contains less noise than the other(s). The analysis can be by extracting statistics from the ECG signals, optionally after first processing them, and then by comparing these statistics. These statistics may include tall peak counts, amplitudes of peaks compared to historical peak amplitudes, signal baseline shift, dwell time near a baseline, narrow peak counts, zero crossings counts, determined heart rates, and so on. Once the less noisy signal is identified, its channel can be followed preferentially or to the exclusion of other channels, for continuing monitoring and/or determining whether to shock the patient.

A wearable cardioverter defibrillator system includes a support structure that a patient can wear. The system also includes electrodes that contact the patient, and define two or more channels from which ECG signals are sensed. A processor may evaluate the channels by analyzing their respective ECG signals, to determine which contains less noise than the other(s). The analysis can be by extracting statistics from the ECG signals, optionally after first processing them, and then by comparing these statistics. These statistics may include tall peak counts, amplitudes of peaks compared to historical peak amplitudes, signal baseline shift, dwell time near a baseline, narrow peak counts, zero crossings counts, determined heart rates, and so on. Once the less noisy signal is identified, its channel can be followed preferentially or to the exclusion of other channels, for continuing monitoring and/or determining whether to shock the patient.

According to at least one example, an ambulatory medical device is provided. The device includes a plurality of electrodes disposed at spaced apart positions about a patient's body and a control unit. The control unit includes a sensor interface, a memory and a processor. The sensor interface is coupled to the plurality of electrodes and configured to receive a first ECG signal from a first pairing of the plurality of electrodes and to receive a second ECG signal from a second pairing of the plurality of electrodes. The memory stores information indicating a preferred pairing, the preferred pairing being either the first pairing or the second pairing. The processor is coupled to the sensor interface and the memory and is configured to resolve conflicts between interpretations of first ECG signal and the second ECG signal in favor of the preferred pairing.

Multiple circuits in a computing device can share one or more conductive elements. The use of the conductive element can vary by circuit, such as an antenna radiator for a radio frequency (RF) circuit or an electrode for an electrocardiography (ECG) circuit. The circuitry sharing a conductive element can utilize signals obtained over different frequency ranges. Those ranges can be used to select decoupling circuitry, or elements, that can enable the respective circuits to obtain signals over a respective frequency range, excluding signals over one or more other frequency ranges corresponding to other circuitry sharing the circuit. Such an approach allows for concurrent independent operation of the circuitry sharing a conductive element.

Methods and systems for combining ablation therapy with navigation of the ablation device. An ablation system may be configured for use with one of two methods to prevent loss of navigation signals during ablation energy delivery. In the first method, ablation energy signals are filtered from the navigation signal. In the second method, the delivery of ablation energy is sequenced with the delivery of navigation energy such that ablation energy and navigation energy are not delivered at the same time and navigation signals received by the system are time-division multiplexed to reconstruct the navigation signals and determine a location of the device within the patient.

An electrophysiology data acquisition system that receives physiological signals from at least one catheter includes an amplifier and at least one noise reduction circuit operatively connected to the amplifier and configured to cancel interference in the physiological signals from the catheter. A drive selection circuit is controllable to connect any one of two or more available electrodes to the noise reduction circuit such that the connected electrode becomes an equalization drive electrode for the catheter. An equalization control module is executable on a processor and configured to select the equalization drive electrode from the two or more available electrodes and to control the drive selection circuit to connect the selected equalization drive electrode to the noise reduction circuit.

The device limits the leakage current in an electronic system for recording electrophysiological signals, where the transducer element is an active device, the device comprising an active transducer (1), intended to contact a human tissue, connected to a transimpedance amplifier (2), and a first resistor (6) connected parallel to the transimpedance amplifier (2), an alternate voltage source (7) and a direct voltage source (8), both connected to the active transducer (1), a first capacitor (3) connected between the alternate voltage source (7) and the active transducer (1), a second resistor (4) connected between the direct voltage source (8) and the active transducer (1), parallel with the first capacitor (3) and the alternate voltage source (7), and a second capacitor (5), connected between the active transducer (1) and the transimpedance amplifier (2).

This disclosure relates to an active medical device which includes a generator for producing multiphase nerve stimulation pulse trains, each pulse train including at least one stimulation pulse preceded by a precharge pulse and ending with a passive discharge pulse. The active medical device also includes a sensor configured to output a control signal representative of a physiological and/or physical parameter capable of being influenced by the output of nerve stimulation pulse trains. The active medical device also includes an automatic charge compensation control circuit configured to receive at the input the control signal output by the sensor, determine an amplitude and/or a precharge pulse time as a function of at least one predetermined criterion, and output to the generator a precharge pulse control signal to be produced at the output.

A biological information measuring apparatus includes a first electrode provided in contact with a user's external auditory canal and a second electrode provided in contact with the user's concha cavum.