| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 600512000 | Orthogonal heartbeat electric signals combined to form vector signal | 18 |
| 20110196249 | CARDIOVERTER/DEFIBRILLATOR AND SIGNAL PROCESSING DEVICE FOR CLASSIFYING INTRACARDIAC SIGNALS - The invention relates to methods of differentiating between ventricular tachycardias (VTs) and supraventricular tachycardias (SVT) with the assistance of morphology detection, and signal processing devices implementing such methods. | 08-11-2011 |
| 20100049069 | BIOMEDICAL SIGNAL MORPHOLOGY ANALYSIS METHOD - A way of quantifying the shape of an ECG waveform is disclosed by detecting the JT segment using two Hidden Markov Models and calculating the analytic signal of the JT segment. Parameters calculated from the analytic signal are used as shape descriptors for the JT segment. The shape descriptors may be displayed in a dimensionality-reduced mapping. Templates representing characteristic shapes can be produced by finding cluster centres in the shape descriptor space, and the novelty of new waveforms can be quantified by comparing the position in shape descriptor space of new shape descriptors to a predefined normal training set or to previously encountered waveforms. Novel shape descriptors can be used to retrieve the corresponding waveforms, and templates of such novel shapes can be created by averaging such waveforms, using dynamic time warping to allow for variations in heart rate. The templates can be manually segmented and the manual segmentation propagated back into other waveforms having similar shape descriptors. | 02-25-2010 |
| 20090209875 | DEVICE FOR THE ANALYSIS OF AN ENDOCARDIAC SIGNAL OF ACCELERATION - A device for the analysis of an endocardiac signal of acceleration. The device preprocesses the acquired endocardiac acceleration (EA) signal by cutting the signal EA collected into sub-signals EA, each one have a duration of one cardiac cycle; separating the cut signals to isolate in each sub-signal EA at least one component EAx, associated with a major cardiac sound, and preferably into components EA1 and EA2 associated with the two major cardiac sounds S1 and S2; and performing a correlation on each component EA1 and EA2, to readjust each sub-signal in relation to a maximum of correlation, so as to deliver a readjusted component EA1 and a readjusted component EA2. The device further determines, starting from the isolated correlated components EA1 and EA2, a component average EA1 and a component average EA2, and to combine these components EA1 and average EA2 so as to produce an average global signal EA for one cycle. The device extracts from these information temporal markers of characteristic moments in the cardiac cycle, in particular markers of the moment of opening and closing of the aortic valve. | 08-20-2009 |
| 20110270102 | METHOD AND APPARATUS FOR DETECTING AND DISCRIMINATING TACHYCARDIA - A medical device and associated method for discriminating cardiac events includes sensing a cardiac signal spatially located across approximately a full duration of a predetermined sensing window. A match score is determined corresponding to the sensed cardiac signal. A beat feature of multiple beat features across less than the full duration of the sensing window is determined, the beat feature being selected from the multiple beat features in response to the match score. Cardiac event evidence is accumulated in response to the match score and the determined beat feature, and cardiac events are discriminated in response to the accumulated cardiac evidence. | 11-03-2011 |
| 20110270103 | METHOD AND APPARATUS FOR DETECTING AND DISCRIMINATING TACHYCARDIA - A medical device and associated method for discriminating cardiac events includes determining whether a first match score is within a first match zone having a first correlation with a non-treatable cardiac event, a second match zone having a second correlation with the non-treatable cardiac event less than the first correlation with the non-treatable event, a third match zone having a first correlation with a treatable cardiac event, and a fourth match zone having a second correlation with the treatable cardiac event greater than the first correlation with the treatable cardiac event. A determination is made as to whether a second match score and a third match score are within the first match zone, the second match zone, the third match zone and the fourth match zone to generate a first adjusting factor, and cardiac event evidence is accumulated in response to the first adjusting factor for discriminating cardiac events. | 11-03-2011 |
| 20100204597 | METHOD AND APPARATUS FOR DETECTING ARRHYTHMIAS IN A MEDICAL DEVICE - A method of detecting a cardiac event that includes sensing cardiac signals from a plurality of electrodes, determining rates of change of the sensed cardiac signals, and determining a range of the sensed cardiac signals. The sensed cardiac signals are detected as being associated with the cardiac event in response to the determined rates of change and the determined range. | 08-12-2010 |
| 20100317983 | METHOD FOR QUANTITATIVE ASSESSMENT OF CARDIAC ELECTRICAL EVENTS - Systems and methods for characterizing aspects of an electrocardiogram signal are presented, wherein primary and secondary analysis schemas are utilized to determine the timing of the end of a signal wave, such as a descending Twave, with precision. In one embodiment, the primary analysis schema involves comparing voltage amplitudes within a given sampling window and the secondary analysis schema involves comparing the results of primary analysis for successive sampling windows. The system may comprise a processor or microcontroller embedded into a system such as an electrocardiogram hardware system, personal computer, electrophysiology system, or the like. | 12-16-2010 |
| 20110251504 | METHODS FOR DETERMINING RISK OF VENTRICULAR ARRHYTHMIA - Methods and systems are disclosed for analyzing three dimensional orthogonal ECG measurements to assess patient risk of a subsequent cardiac event based on evaluation of cardiac vector values in view of risk factors defined by the invention. | 10-13-2011 |
| 20110137192 | Arrhythmia Discrimination using ECG's Sensed from Multiple Implanted Electrodes - Cardiac monitoring and/or stimulation methods and systems provide for monitoring, diagnosing, defibrillation and pacing therapies, or a combination of these capabilities, including cardiac systems incorporating or cooperating with neuro-stimulating devices, drug pumps, or other therapies. Embodiments of the present invention relate generally to implantable medical devices employing automated cardiac activation sequence monitoring and/or tracking for arrhythmia discrimination. Embodiments of the invention are directed to devices and methods involving sensing a plurality of composite cardiac signals using a plurality of implantable electrodes. A source separation is performed using the sensed plurality of composite cardiac signals and the separation produces one or more cardiac signal vectors associated with one or more cardiac activation sequences that is indicative of ischemia. A change of the one or more cardiac signal vectors is detected using the one or more cardiac signal vectors. Cardiac arrhythmias are discriminated using the one or more cardiac signal vectors. | 06-09-2011 |
| 20110137191 | Method and Apparatus in Connection with Exercise - An apparatus in connection with a fitness exercise of a person, including means for processing multidimensional electrocardiographic data of the person, the multidimensional electrocardiographic data comprising at least two spatially separately measured electrocardiographic signal components, means for forming a vectorcardiographic measure on the basis of the multidimensional electrocardiographic data, and means for applying the vectorcardiographic measure in determination of a fitness exercise related parameter. | 06-09-2011 |
| 20090247888 | ECG SIGNAL POWER VECTOR DETECTION OF ISCHEMIA OR INFARCTION - A method comprising sensing at least one cardiac signal representative of cardiac activity of a subject using an implantable medical device (IMD), calculating, from the cardiac signal, a first dominant vector corresponding to a direction and magnitude of maximum signal power of an ST-T first segment of a cardiac cycle and a second dominant vector corresponding to a direction and magnitude of maximum signal power of a P-QRS second segment of a cardiac cycle, measuring a change in the first dominant vector, measuring a change in the second dominant vector, and subtracting the change in the second dominant vector from the measured change in the first dominant vector to form a difference. | 10-01-2009 |
| 20120071774 | DETECTING OR VALIDATING A DETECTION OF A STATE CHANGE FROM A TEMPLATE OF HEART RATE DERIVATIVE SHAPE OR HEART BEAT WAVE COMPLEX - Methods, systems, and apparatus for detecting and/or validating a detection of a state change by matching the shape of one or more of an cardiac data series, a heart rate variability data series, or at least a portion of a heart beat complex, derived from cardiac data, to an appropriate template. | 03-22-2012 |
| 20110184300 | ATRIAL FIBRILLATION DETECTION BASED ON ABSENCE OF CONSISTENT P-LOOPS IN AVERAGED VECTORCARDIOGRAM - A method for determining the presence of atrial fibrillation includes obtaining data from at least three orthogonal leads indicative of electrical activity of a heart over multiple heart beats, averaging the data to obtain an average heart beat, generating, from the averaged data, an average heart beat vectorcardiogram (VCG) that is a function of voltage level, comparing, over a segment of the average heart beat, the average heart beat VCG with a threshold value, and indicating whether the average heart beat VCG exceeds or does not exceed the threshold value. | 07-28-2011 |
| 20100298729 | Cardiac Activation Sequence Monitoring for Ischemia Detection - Cardiac monitoring and/or stimulation methods and systems that provide one or more of monitoring, diagnosing, defibrillation, and pacing. Cardiac signal separation is employed to detect, monitor, track and/or trend ischemia using cardiac activation sequence information. Ischemia detection may involve sensing composite cardiac signals using implantable electrodes, and performing a signal separation that produces one or more cardiac activation signal vectors associated with one or more cardiac activation sequences. A change in the signal vector may be detected using subsequent separations. The change may be an elevation or depression of the ST segment of a cardiac cycle or other change indicative of myocardial ischemia, myocardial infarction, or other pathological change. The change may be used to predict, quantify, and/or qualify an event such as an arrhythmia, a myocardial infarction, or other pathologic change. Information associated with the vectors may be stored and used to track the vectors. | 11-25-2010 |
| 20100179446 | DEVICE AND PROCEDURE FOR VISUAL THREE-DIMENSIONAL PRESENTATION OF ECG DATA - The analysis of ECG (electrocardiogram) data by exploiting computerized three-dimensional spatial presentation of the measured data using the vector concept. A three-dimensional presentation of the human heart may be correlated with waveforms specific for standard ECG or derived ECG signals based on the dipole approximation of the heart electrical activity. The three-dimensional heart model may be rotated, and the ECG signals are interactively linked to the model. Cardiac ischemia (inadequate blood supply) is detected by calculating an ECG ST-segment vector magnitude or an ST-T spatial angle change of a heart vector from the heart model and comparing these to respective predetermined ischemia criteria, using actual or virtual ECG lead sites. | 07-15-2010 |
| 20100179445 | IMPLANTABLE MEDICAL DEVICE WITH ADAPTIVE SIGNAL PROCESSING AND ARTIFACT CANCELLATION - A medical device includes one or more sensors used to acquire a multi-dimensional signal. In one embodiment, principal component analysis is performed on the multi-dimensional signal to produce signal data. The principal component analysis results are used to cancel signal artifact in one embodiment. A medical device controller produces one of a therapy control and a diagnostic output in response to the signal data. | 07-15-2010 |
| 20130096447 | System and methods for serial analysis of electrocardiograms - Systems and methods for serial analysis of electrocardiograms are presented, wherein serial electrocardiographic (ECG) assessment is incorporated with three-dimensional vectorial analysis of the cardiac electrical signal, using changes in novel 3D-based vectorial markers over time to improve diagnostic sensitivity for acute coronary syndromes (ACS), and improve differentiation of ACS from the broad range of heart diseases that resemble ACS on ECG. | 04-18-2013 |
| 20080200822 | Method for determining cardiac impulse conduction and associated medical device - A method for determining cardiac impulse conduction, in particular three-dimensional cardiac impulse conduction, in a patient, comprising: generating an image recording of an area of the body of the patient capturing at least partially electrocardiogram electrodes arranged on the body of the patient by an imaging modality; determining positions of the electrocardiogram electrodes in a system of coordinates assigned to the imaging modality; recording of potential data of some of the electrocardiogram electrodes; and reconstructing cardiac impulse conduction depending on the determined positions of the electrocardiogram electrodes, the image recording and the recording of potential data of the electrocardiogram electrodes, wherein at least one image recording is generated substantially simultaneously with the recording of potential data of the electrocardiogram electrodes or is generated in the period between two recordings of potential data of the electrocardiogram electrodes. | 08-21-2008 |
