Abstract: An externally worn cardiac monitoring and/or treatment system with battery detachment detection is provided. The system includes detachment circuitry and audible and/or vibrational alarm circuitry operably coupled to the detachment circuitry. The detachment circuitry is configured to detect whether the rechargeable battery is detached from the battery-powered externally worn cardiac device by monitoring a connection established between the rechargeable battery and the at least one processor and output a battery status signal indicating whether the rechargeable battery is detached from the battery-powered externally worn cardiac device. The audible and/or vibrational alarm circuitry is configured to receive the battery status signal and output an audible alert in a predetermined frequency range and/or a tactile alert if the rechargeable battery is detached.

Abstract: A system for removing device signals from surface electrical signals received from an ambulatory patient worn device is provided. The system includes a wearable cardiac monitoring device configured to be continuously worn by a patient. The wearable cardiac monitoring device includes signal generation circuitry to provide a device-generated signal having a predetermined frequency; a skin-contacting surface to inject the device-generated signal into a skin of the patient; an electrode to acquire the surface electrical signal from the skin of the patient; and processing circuitry. The surface electrical signal includes a device-generated signal and a physiological signal generated by the patient.

Abstract: A serviceable wearable cardiac treatment device for continuous extended use by an ambulatory patient includes a garment, a device controller, and an ingress-protective housing. The garment is configured to dispose therein a plurality of ECG sensing and therapy electrodes to monitor for and treat a cardiac arrhythmia in the patient. The device controller is configured to be in separable electrical communication with the plurality of ECG sensing and therapy electrodes and includes an impact-resistant energy core, and first and second circuit boards affixed to opposing sides of the impact-resistant energy core. The impact-resistant energy core includes a frame and at least one capacitor permanently bonded to the frame to form a unitary mass. The ingress-protective housing is configured to enable removal of the impact-resistant energy core and the first and second circuit boards during servicing.

Abstract: A serviceable wearable cardiac treatment device for continuous extended use by an ambulatory patient includes a garment, a device controller, and an ingress-protective housing. The garment is configured to dispose therein a plurality of ECG sensing and therapy electrodes to monitor for and treat a cardiac arrhythmia in the patient. The device controller is configured to be in separable electrical communication with the plurality of ECG sensing and therapy electrodes and includes an impact-resistant energy core, and first and second circuit boards affixed to opposing sides of the impact-resistant energy core. The impact-resistant energy core includes a frame and at least one capacitor permanently bonded to the frame to form a unitary mass. The ingress-protective housing is configured to enable removal of the impact-resistant energy core and the first and second circuit boards during servicing.

Abstract: An ambulatory medical device including a plurality of sensing electrodes and one or more processors operably coupled to the plurality of sensing electrodes is provided. Each sensing electrodes is configured to be coupled eternally to a patient and to detect one or more ECG signals. The one or more processors are configured to receive at least one electrode-specific digital signal for each of the plurality of sensing electrodes, determine a noise component for each of the electrode-specific digital signals, analyze each of the noise components for each of the plurality of sensing electrodes, generate electrode matching information for each sensing electrode of the plurality of sensing electrodes based upon analysis of each of the noise components, determine one or more sensing electrode pairs based upon the electrode matching information, and monitor each of the one or more sensing electrode pairs for ECG activity of the patient.

Abstract: An ambulatory medical device including a plurality of sensing electrodes and one or more processors operably coupled to the plurality of sensing electrodes is provided. Each sensing electrodes is configured to be coupled eternally to a patient and to detect one or more ECG signals. The one or more processors are configured to receive at least one electrode-specific digital signal for each of the plurality of sensing electrodes, determine a noise component for each of the electrode-specific digital signals, analyze each of the noise components for each of the plurality of sensing electrodes, generate electrode matching information for each sensing electrode of the plurality of sensing electrodes based upon analysis of each of the noise components, determine one or more sensing electrode pairs based upon the electrode matching information, and monitor each of the one or more sensing electrode pairs for ECG activity of the patient.

Abstract: An ambulatory cardiac device for improving a signal to noise profile of an electrocardiogram (ECG) signal of a patient is provided. The ambulatory cardiac device includes a plurality of active ECG electrodes disposed in a plurality of locations about a patient. Each active electrode can include an ECG electrode substrate configured to be in physical contact with skin of the patient, a local biasing substrate proximate to the ECG electrode substrate and configured to be in physical contact with the skin of the patient, and local biasing circuitry configured to provide a local biasing signal into a body of the patient via the local biasing substrate.

Abstract: A serviceable wearable cardiac treatment device for continuous extended use by an ambulatory patient includes a garment and a device controller. The garment is configured to dispose therein a plurality of ECG sensing and therapy electrodes. The device controller is configured to be in separable electrical communication with the plurality of ECG sensing and therapy electrodes. The device controller includes an impact-resistant energy core, including a frame and capacitor(s) permanently bonded to the frame. The device controller includes a critical function circuit board, including critical function processor(s) and circuitry, and a non-critical function circuit board, including non-critical function processor(s) and circuitry. The critical function circuit board is in electrical communication with the capacitor(s) and configured to control critical operations of the device controller regardless of operability of the non-critical function circuit board.

Abstract: A serviceable wearable cardiac treatment device for continuous extended use by an ambulatory patient includes a garment, a device controller, and an ingress-protective housing. The garment is configured to dispose therein a plurality of ECG sensing and therapy electrodes to monitor for and treat a cardiac arrhythmia in the patient. The device controller is configured to be in separable electrical communication with the plurality of ECG sensing and therapy electrodes and includes an impact-resistant energy core, and first and second circuit boards affixed to opposing sides of the impact-resistant energy core. The impact-resistant energy core includes a frame and at least one capacitor permanently bonded to the frame to form a unitary mass. The ingress-protective housing is configured to enable removal of the impact-resistant energy core and the first and second circuit boards during servicing.

Abstract: An externally worn cardiac monitoring and/or treatment system with battery detachment detection is provided. The system includes detachment circuitry and audible and/or vibrational alarm circuitry operably coupled to the detachment circuitry. The detachment circuitry is configured to detect whether the rechargeable battery is detached from the battery-powered externally worn cardiac device by monitoring a connection established between the rechargeable battery and the at least one processor and output a battery status signal indicating whether the rechargeable battery is detached from the battery-powered externally worn cardiac device. The audible and/or vibrational alarm circuitry is configured to receive the battery status signal and output an audible alert in a predetermined frequency range and/or a tactile alert if the rechargeable battery is detached.

Abstract: An ambulatory medical device including a plurality of sensing electrodes and one or more processors operably coupled to the plurality of sensing electrodes is provided. Each sensing electrodes is configured to be coupled eternally to a patient and to detect one or more ECG signals. The one or more processors are configured to receive at least one electrode-specific digital signal for each of the plurality of sensing electrodes, determine a noise component for each of the electrode-specific digital signals, analyze each of the noise components for each of the plurality of sensing electrodes, generate electrode matching information for each sensing electrode of the plurality of sensing electrodes based upon analysis of each of the noise components, determine one or more sensing electrode pairs based upon the electrode matching information, and monitor each of the one or more sensing electrode pairs for ECG activity of the patient.