A wearable cardioverter defibrillator (WCD) comprises a plurality of electrocardiography (ECG) electrodes and a plurality of defibrillator electrodes to contact the patient's skin when the WCD is delivering therapy to the patient, a preamplifier coupled to the ECG electrodes to obtain ECG data from the patient. a processor to receive the ECG data from the preamplifier, and a high voltage subsystem to provide a defibrillation voltage to the patient through the plurality of defibrillator electrodes in response to a shock signal received from the processor. In a first power mode of a range of power modes the preamplifier is configured to perform low-fidelity ECG acquisition and the processor is configured to perform simple arrythmia detection analysis, and in a second mode of the range of power modes the preamplifier is configured to perform high-fidelity ECG acquisition and the processor is configured to perform complex arrythmia detection analysis.

In embodiments, an external defibrillator has an electrical circuit with a special output stage for the high-voltage defibrillation pulse. The output stage includes switches that can turn on for delivering the pulse, and off during all other times. The output stage also includes a diverting resistance to divert electrical current that could leak into the patient while a capacitor is being charged. An optional detector may notify if a component is malfunctioning. An advantage can be that an external defibrillator may be created according to embodiments that uses, in its output stage, semiconductor switches instead of relays. As semiconductor switches weigh less and occupy less volume than relays, an external defibrillator according to embodiments may have less weight and volume. Especially in wearable defibrillator applications, less weight means less effort to carry and less volume means easier concealment under clothing.

A medical imaging system configured to provide cardiac sonothrombolysis therapy is disclosed. Various embodiments of portable cardiac sonothrombolysis devices are disclosed. The devices may be configured to determine if one or more ultrasound probes have a proper view of the heart, and if not, may steer the beam to a desired location. The ultrasound probes may be configured for both imaging and cardiac sonothrombolysis therapy. The ultrasound probes may be configured to be hands-free. The portable devices may be configured to provide operating instructions to an operator. The instructions may be provided via graphics, audio, and/or video.

In at least one example, a medical device is provided. The medical device includes at least one therapy electrode, at least one acoustic sensor, and at least one processor coupled with the at least one therapy electrode and the at least one acoustic sensor. The at least one processor is configured to deliver at least one pacing pulse via the at least one therapy electrode and to analyze processed acoustic data to determine whether the at least one pacing pulse resulted in capture.

Cardiac electrodes and techniques for testing application of the electrodes to a victim are described herein.

A wearable therapeutic device includes a garment configured to be worn on a torso of a patient. The garment has an anterior portion and a posterior portion. The garment is configured to house at least one defibrillator component, a first therapy electrode disposed in the anterior portion of the garment, a second therapy electrode disposed in the posterior portion of the garment, and an alarm module configured to alert the patient of an impending defibrillation shock from the at least one defibrillator component to be delivered by at least one of the first therapy electrode and the second therapy electrode. The first therapy electrode and the second therapy electrode are configured to be electrically coupled to the at least one defibrillator component. At least one of the first therapy electrode and the second therapy electrode is at least one of woven into the garment and comprises a textile material.

An automated external defibrillator includes a first pad at least partially colored in a first color, a second pad at least partially colored in a second color, and a main unit to which the first pad and the second pad are connected. The main unit has a first guidance surface that indicates how to attach of the first pad and the second pad. The first guidance surface has a first marker in the first color at a position corresponding to an attachment position of the first pad and a second marker in the second color at a position corresponding to an attachment position of the second pad.

In one embodiment, a method to alert a user of a wearable cardioverter defibrillator (WCD) is described. The method includes determining when a system issue is resolved and issuing an alert when the system issue is resolved. In some embodiments, the method may detect the system issue and issuing a system alert based at least in part on the system issue. The method may then monitor a status of the system issue. In some instances, the method may detect an abnormality in system operation sand determine a severity rating for the abnormality. The method may determine if the abnormality satisfies a time duration threshold based at least in part on the severity rating.

Augmented, virtual, and/or mixed reality applications in optimizing a fitting process and a fit of wearables, including wearable cardioverter defibrillators, to a wearer's body.

Improved automatic chest compression systems which use constricting belts, repeatedly inflating bladders, or reciprocating pistons to compress the chest. A bladder is placed between the chest and the particular mechanism used to compress the chest during CPR. The bladder maximizes the effectiveness of chest compressions.