Patent application number | Description | Published |
20090093860 | AUTOMATIC DETERMINATION OF T-SHOCK VULNERABLE WINDOW - A method and apparatus for determining a T-wave shock interval sense a cardiac electrogram (EGM) signal comprising a T-wave signal. A T-wave center is determined from the EGM signal, and a T-wave shock interval is determined in response to determining the T-wave center. A T-wave shock is delivered at the T-wave shock interval computed based on the T-wave center. | 04-09-2009 |
20100023072 | Methods for the Determination of T-Shock Vulnerable Window from Far-Field Electrograms in Implantable Cardioverter Defibrillators - Methods for determination of timing for electrical shocks to the heart to determine shock strength necessary to defibrillate a fibrillating heart. The timing corresponds the window of most vulnerability in the heart, which occurs during the T-wave of a heartbeat. Using a derivatized T-wave representation, the timing of most vulnerability is determined by a center of the area method, peak amplitude method, width method, or other similar methods. Devices are similarly disclosed embodying the methods of the present disclosure. | 01-28-2010 |
20110196247 | REJECTING OVERSENSING DUE TO NOISE - In general, this disclosure is directed to signal processing based methods to reject oversensing due to electromagnetic interference or other noise without compromising tachyarrhythmia detection sensitivity. A method comprises sensing a signal indicative of cardiac activity, detecting a cardiac event based on the signal, determining a count of fluctuations of the signal within a window between the detected cardiac event and a next cardiac event, and determining whether noise is present in the signal based on the count. | 08-11-2011 |
20120004515 | MULTI-CHANNEL SENSING METHODS IN IMPLANTABLE CARDIOVERTOR DEFIBRILLATORS - An implantable medical device uses an implantable sensor for acquiring a physiological signal that is received by a digital signal processor. The digital signal processor is a multi-channel signal processor including a first signal processing channel having a first sensitivity for sensing the physiological signal and a second signal processing channel having a second sensitivity different than the first sensitivity for sensing the physiological signal. | 01-05-2012 |
20120197150 | EXTERNAL CARDIAC MONITOR - An external physiological monitor continuously senses and monitors cardiac function of a patient to allow detection of cardiac events and the recording of data and signals pre- and post-event. The monitor is connected to and suspended on the patient's body solely by the electrode assembly. Stored diagnostic data may be uplinked and evaluated by the patient's physician utilizing a programmer via a two-way telemetry link. An external patient activator may optionally allow the patient, or other care provider to manually activate the recording of diagnostic data. | 08-02-2012 |
20130096449 | ELECTROGRAM CLASSIFICATION ALGORITHM - The present disclosure is directed to the classification of cardiac episodes using an algorithm. In various examples, an episode classification algorithm evaluates electrogram signal data using a probabilistic ventricular oversensing algorithm. The algorithm may look at a plurality of factors weighing for and against a determination of ventricular oversensing. In some examples, the algorithm may also determine whether the cardiac episode includes atrial sensing issues. | 04-18-2013 |
20150306375 | IMPLANTABLE EXTRAVASCULAR ELECTRICAL STIMULATION LEAD HAVING IMPROVED SENSING AND PACING CAPABILITY - Implantable medical electrical leads having electrodes arranged such that a defibrillation coil electrode and a pace/sense electrode(s) are concurrently positioned substantially over the ventricle when implanted are described. The leads include an elongated lead body having a distal portion and a proximal end, a connector at the proximal end of the lead body, a defibrillation electrode located along the distal portion of the lead body, wherein the defibrillation electrode includes a first segment and a second segment proximal to the first segment by a distance, a first electrical conductor extending from the proximal end of the lead body and electrically coupling to the first segment and the second segment of the defibrillation electrode, and at least one pace/sense electrode located between the first segment and the second segment of the defibrillation electrode. | 10-29-2015 |
20150306410 | IMPLANTABLE EXTRAVASCULAR ELECTRICAL STIMULATION LEAD HAVING IMPROVED SENSING AND PACING CAPABILITY - Implantable medical electrical leads having electrodes arranged such that a defibrillation coil electrode and a pace/sense electrode(s) are concurrently positioned substantially over the ventricle when implanted as described. The leads include an elongated lead body having a distal portion and a proximal end, a connector at the proximal end of the lead body, a defibrillation electrode located along the distal portion of the lead body, wherein the defibrillation electrode includes a first electrode segment and a second electrode segment proximal to the first electrode segment by a distance. The leads may include at least one pace/sense electrode, which in some instances, is located between the first defibrillation electrode segment and the second defibrillation electrode segment. | 10-29-2015 |