Method and system for determining an atrial contraction timing fiducial in a leadless cardiac pacemaker system is disclosed. An electrical cardiac signal associated with an atrial contraction of the patient's heart and a mechanical response to the atrial contraction of a patient's heart are used to determine an atrial contraction timing fiducial. A ventricle pacing pulse may then be generated an A-V delay after the atrial contraction timing fiducial.

Embodiments of the present disclosure relate to systems and methods for determining a subject's blood pressure using one or more implantable medical devices (IMDs). In an embodiment, a medical system comprises: at least one implantable medical device configured to sense signals associated with heart sounds of a subject and a processing unit communicatively coupled to the at least one implantable medical device. The processing unit is configured to: receive heart sound signals corresponding to the signals associated with the heart sounds; and calculate a surrogate of the subject's blood pressure using at least one heart sound signal of the received heart sound signals.

Systems, devices and methods are provided for power-efficient wireless communications between electronic devices. In particular, the embodiments disclosed herein can reduce battery consumption in a transmitting electronic device and enhance data integrity of data received by a receiving electronic device. According to the embodiments, a first electronic device transmits advertising packets according to a wireless communications protocol, wherein the advertising packets include a first payload data. In response to receiving the advertising packets, a second electronic device can transmit a scan request to the first electronic device which, in turn, terminates the transmission of advertising packets.

In embodiments a WCD system is worn and/or carried by an ambulatory patient. The WCD system analyzes an ECG signal of the patient, to determine whether or not the patient should be given an electric shock to restart their heart. If so, then the WCD system first gives a preliminary alarm to the patient, asking them to prove they are alive if they are. The WCD system further determines whether the ECG signal contains too much High Amplitude (H-A) noise, which can distort the analysis of the ECG signal. If too much H-A noise is detected for a long time, the WCD system may eventually alert the patient about their activity, so that the ECG noise may be abated. The WCD system may even pause the analysis of the ECG signal, so that there will be no preliminary alarms that could be false until the ECG noise is abated.

Embodiments described herein relate to implantable medical devices (IMDs) and methods for use therewith. Such a method includes using an accelerometer of an IMD (e.g., a leadless pacemaker) to produce one or more accelerometer outputs indicative of the orientation of the IMD. The method can also include the IMD using an accelerometer to identify when the orientation of the IMD is such that the IMD will likely be able to successfully communicate with another IMD via one or more communication pulses sent from the IMD to the other IMD. The method also includes the IMD sending of the one or more communication pulses, that are used to communicate with the other IMD, when the orientation of the IMD is such that the IMD will likely be able to successfully communicate with the other IMD via one or more communication pulses sent from the IMD to the other IMD.

A system for generating an alert for a systemic infection of a patient comprises an implantable medical device configured to measure at least one physiological parameter, a remote monitoring system configured to receive information from the implantable medical device, and an information system configured to communicate with said remote monitoring system. At least one of the implantable medical device, the remote monitoring system and the information system is configured to analyze information relating to said at least one physiological parameter to generate an alert signal for a systemic infection of the patient based on a state of the at least one physiological parameter, wherein at least one of the implantable medical device, the remote monitoring system and the information system is further configured to generate an alert message to be provided to a specified destination based on said alert signal.

A defibrillator is provided comprising an activation mechanism having an activator and a status indicator, wherein the activator is disposable in a first condition in which the defibrillator is deactivated and in a second condition in which the defibrillator is activated and the status indicator is operable in at least a first mode in which a ‘defibrillator ready’ status of the defibrillator is indicated and a second mode in which a ‘defibrillator not ready’ status of the defibrillator is indicated. By having an activation mechanism which includes the activator and the status indicator, users of the defibrillator are not confused between separate activation and status indication devices and are able to use the activator promptly.

A composite electrode intracardiac defibrillation catheter includes a first electrode group including at least two first electrodes for detecting an electrophysiological electrical signal of a site or a cell group in a heart chamber, and a second electrode group including at least one second electrode located between an adjacent pair of the at least two first electrodes for causing an electric current by a high-voltage defibrillation electric shock for defibrillation to flow in a contact site in the heart chamber or a contact site in a vein, and a conductive length of a surface of the at least one second electrode in a longitudinal direction of the composite electrode intracardiac defibrillation catheter is longer than a conductive length of each of the at least two first electrodes.

A patient-coupled resuscitation device for use with a plurality of medical devices is provided. The resuscitation device includes a portion configured to provide treatment, a connector configured to connect the resuscitation device to one of a first medical device and a second medical device, and a housing including a memory and associated circuitry. The memory and associated circuitry is configured to store a device identifier to identify the resuscitation device; receive medical treatment information from the first medical device, the medical treatment information including at least one of: patient physiological data, patient characteristic data, and rescuer performance data; receive timing information of the medical treatment information from the first medical device; record the medical treatment information and the timing information; and transfer, upon detecting a connection to the second medical device, the medical treatment information and the timing information to the second medical device.

In one embodiment, a method to alert a user of a wearable cardioverter defibrillator (WCD) is described. The method includes detecting a condition requiring attention of the patient and issuing an alert to notify the patient of the condition. The method also includes receiving a first input from the patient to replay the audible portion of the alert and replaying the audible portion of the alert when the first input is received.