In one example, an ambulatory medical device is provided. The ambulatory medical device includes a plurality of subsystems, at least one sensor configured to acquire data descriptive of a patient, a user interface and at least one processor coupled to the at least one sensor and the user interface. The at least one processor is configured to identify subsystem status information descriptive of an operational status of each subsystem of the plurality of subsystems and to provide a device health report for the ambulatory medical device via the user interface, the device health report being based on the operational status of each subsystem.

A system including a plurality of wireless sensors for monitoring one or more parameters of a subject is provided. The wireless sensors can be attachable to or implantable in the subject and form a network. The sensors can include a sensing component configured to detect a signal corresponding to at least one condition of the subject. The sensors further can include a communication component configured to wirelessly transmit the detected signal to at least another of the plurality of wireless sensors, and wirelessly receive a signal transmitted from at least one of the remaining sensors in the network.

A device and method that detects a lead failure condition for a lead having at least one electrode in contact with body tissue, wherein the lead is connected to the device. The device includes a first filter that filters an electric signal sensed by the at least one electrode to a first filtered signal, and a lead failure detection unit that detects signal characteristics of the first filtered signal. The lead failure detection unit indicates a lead failure condition when the detected signal characteristics correspond to a step response of the first filter.

A long term physiological signal sensing patch, including a water protective film, an electrode layer, a conductive hydrogel layer, a block layer and a first attaching layer. The water protective film provides functions of electrical insulation, stickiness and water protection. The electrode layer includes at least two electrodes attached to the bottom of the water protective film. The conductive hydrogel layer configured beneath the electrodes is electrically conductive and sticky. The block layer is under the electrodes to block water, and accommodates the conductive hydrogel layer. The first attaching layer is provided around the block layer. Therefore, the sensing patch can be attached to the human body for a long period of time to sense physiological signal, which is further transmitted to the external apparatus for more detailed analysis, calculation or display.

A bioelectrical signal abnormality monitoring method comprises: generating a noise signal having a preset constant frequency; superposing the noise signal onto a right leg drive electrode; using a front-end circuit to preprocess analog signals from a reference electrode and a collecting electrode, and outputting the analog signals to an analog-to-digital converter; using the analog-to-digital converter to convert into digital signals, and transmitting the digital signals to an operation analysis unit; the operation analysis, unit performing band-stop filtering on the digital signals, performing a subtraction operation on the digital signals before and after the band-stop filtering processing to obtain a difference value, storing the difference value in a queue, periodically solving for the RMS of the data in the queue, and based on the RMS and a fitting formula, calculating the impedance of the human body; and judging an electrode connection state according to the impedance of the human body.

A bioelectrical signal abnormality monitoring method comprises: generating a noise signal having a preset constant frequency; superposing the noise signal onto a right leg drive electrode; using a front-end circuit to preprocess analog signals from a reference electrode and a collecting electrode, and outputting the analog signals to an analog-to-digital converter; using the analog-to-digital converter to convert into digital signals, and transmitting the digital signals to an operation analysis unit; the operation analysis, unit performing band-stop filtering on the digital signals, performing a subtraction operation on the digital signals before and after the band-stop filtering processing to obtain a difference value, storing the difference value in a queue, periodically solving for the RMS of the data in the queue, and based on the RMS and a fitting formula, calculating the impedance of the human body; and judging an electrode connection state according to the impedance of the human body.

A wearable device for treating dysmenorrhea in a patient includes a microprocessor, electrical stimulator and at least one electrode configured to deliver electrical stimulation from the external surface of the patient's epidermal layer through a range of 0.1 mm to 10 mm or a range of 0.1 mm to 20 mm of the dermis by applying electrical stimulation to the epidermis of a T9 to T12, L1, L2, L5 and/or S1 to S4 dermatomes of the patient. The device includes a pad, in which the electrode is disposed, for secure placement of the device on a skin surface of the patient. The device is adapted to provide electrical stimulation as per stimulation protocols and to communicate wirelessly with a companion control device configured to monitor and record menstruation-related patterns of the patient. The control device is also configured to monitor, record, and modify stimulation parameters of the stimulation protocols.

Electrode impedances on a body of a subject are measured by connecting a sense electrode, a reference electrode and a return electrode to the body, using the sense electrode to deliver a test current from a current source to the body of the subject, and measuring the potential difference between the sense electrode and the reference electrode. The impedance of the sense electrode on the body is measured in accordance with the measurement of the potential difference between the sense electrode and the reference electrode.

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 method is for determining electrode status information relating to an electrode in a differential voltage measuring system for measuring a bioelectric signal, the electrode status information indicating whether the electrode is connected or not connected. An embodiment of the method includes the acquisition of a temporal profile of an electric current flowing through a shunt resistor, wherein the shunt resistor is arranged in series with the electrode in an electric transmission path of the differential voltage measuring system, and the determination of the electrode status information on the basis of the temporal profile.