Technologies and implementations for a wearable medical device (WMD). The technologies and implementations facilitate incorporating a blood oxygen saturation level device with the WMD. Additionally, the technologies and implementations include wearable cardioverter device (WCD) incorporating a blood oxygen saturation level device.

A muscle activity sensor includes a base textile, an electrode, and an interconnect. The base textile is configured to apply a compression force against a dermal surface of the user. The electrode is coupled to the base textile and includes a sensor layer including a conductive textile coupled to a dermal side of the base textile. The sensor layer is configured to receive electrical signals associated with muscle activity of the user. The electrode may also be configured to provide the electrical signals as an output signal. The interconnect may be coupled to the base textile over a distance from the electrode to an interconnect junction contact such that the interconnect moves with the base textile as the user moves. The interconnect may be further configured to deliver the output signal from the electrode to the interconnect junction contact.

A muscle activity sensor includes a base textile, an electrode, and an interconnect. The base textile is configured to apply a compression force against a dermal surface of the user. The electrode is coupled to the base textile and includes a sensor layer including a conductive textile coupled to a dermal side of the base textile. The sensor layer is configured to receive electrical signals associated with muscle activity of the user. The electrode may also be configured to provide the electrical signals as an output signal. The interconnect may be coupled to the base textile over a distance from the electrode to an interconnect junction contact such that the interconnect moves with the base textile as the user moves. The interconnect may be further configured to deliver the output signal from the electrode to the interconnect junction contact.

A bioelectric current estimation method includes acquiring position information of a nerve in a measurement target region of a subject for which magnetic data is measured with a magnetic sensor, the position information of the nerve being acquired based on a nerve image included in a morphological image of the measurement target region; acquiring a positional relationship between a position of the nerve and a position of the magnetic sensor, based on the acquired position information of the nerve and position information of the magnetic sensor when the magnetic sensor is positioned to face the measurement target region; and estimating a neural activity current, which is generated in association with neural activity of the subject, based on the acquired positional relationship and the magnetic data of the measurement target region measured by the magnetic sensor.

A bioelectric current estimation method includes acquiring position information of a nerve in a measurement target region of a subject for which magnetic data is measured with a magnetic sensor, the position information of the nerve being acquired based on a nerve image included in a morphological image of the measurement target region; acquiring a positional relationship between a position of the nerve and a position of the magnetic sensor, based on the acquired position information of the nerve and position information of the magnetic sensor when the magnetic sensor is positioned to face the measurement target region; and estimating a neural activity current, which is generated in association with neural activity of the subject, based on the acquired positional relationship and the magnetic data of the measurement target region measured by the magnetic sensor.

Systems and methods for evaluating patients for ischemic heart disease are provided. An example system includes a flow sensor to sense a respiratory flow, an analyzer to determine a respiratory gas composition of at least a portion of the respiratory flow, an ECG device configured to determine ST segment values, and a computing device. The computing device may be configured to: receive gas exchange measurements that are based on breath-by-breath data captured by the flow sensor and the analyzer during a cardiopulmonary exercise test that includes an exercise phase; receive ST segment values captured by the ECG device during the cardiopulmonary exercise test; determine an ischemic index value based on the received gas exchange measurements and ST segment values; and output the ischemic index. The ST segment values may include ST segment depression or elevation values and the ischemic index value may be determined from the ST segment depression/elevation values.

Systems and methods for evaluating patients for ischemic heart disease are provided. An example system includes a flow sensor to sense a respiratory flow, an analyzer to determine a respiratory gas composition of at least a portion of the respiratory flow, an ECG device configured to determine ST segment values, and a computing device. The computing device may be configured to: receive gas exchange measurements that are based on breath-by-breath data captured by the flow sensor and the analyzer during a cardiopulmonary exercise test that includes an exercise phase; receive ST segment values captured by the ECG device during the cardiopulmonary exercise test; determine an ischemic index value based on the received gas exchange measurements and ST segment values; and output the ischemic index. The ST segment values may include ST segment depression or elevation values and the ischemic index value may be determined from the ST segment depression/elevation values.

A biomedical electrode includes a hydrogel layer, a trace layer above the hydrogel layer, the trace layer having a conductive trace, a conductive adhesive layer above the trace layer, and a terminal above the conductive adhesive layer. The hydrogel layer, trace layer, conductive adhesive layer, and terminal are assembled together without requiring a piloting effect to overcome misalignment between these components.

A biomedical electrode includes a hydrogel layer, a trace layer above the hydrogel layer, the trace layer having a conductive trace, a conductive adhesive layer above the trace layer, and a terminal above the conductive adhesive layer. The hydrogel layer, trace layer, conductive adhesive layer, and terminal are assembled together without requiring a piloting effect to overcome misalignment between these components.

An electrocardiogram lead package that contains low-cost printed constructs and the associated method of manufacture. The electrocardiogram lead package contains a first and second printed construct. The constructs include electrodes, lead hubs, and printed wire leads on a flexible substrate. The electrodes contain printed contact heads. The lead hubs contain printed contact pads. The printed wire leads contains printed conductive pathways. On the flexible substrate, the electrodes of the two constructs are linearly aligned and interposed. When separated from the electrocardiogram lead package, the first and second printed constructs provide all the electrodes and leads needed to perform an electrocardiogram. After one use, the printed constructs are discarded.