Detecting R Portion Of Signal Waveform Patents (Class 600/521)
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Publication number: 20140107511Abstract: The present invention provides an improved, Internet-based system that seamlessly collects cardiovascular data from a patient before, during, and after a procedure for EP or an ID. During an EP procedure, the system collects information describing the patient's response to PES and the ablation process, ECG waveforms and their various features, HR and other vital signs, HR variability, cardiac arrhythmias, patient demographics, and patient outcomes. Once these data are collected, the system stores them on an Internet-accessible computer system that can deploy a collection of user-selected and custom-developed algorithms. Before and after the procedure, the system also integrates with body-worn and/or programmers that interrogate implanted devices to collect similar data while the patient is either ambulatory, or in a clinic associated with the hospital. A data-collection/storage module, featuring database interface, stores physiological and procedural information measured from the patient.Type: ApplicationFiled: October 8, 2013Publication date: April 17, 2014Applicant: Perminova Inc.Inventors: Matt Banet, Greg Feld, Marshal Dhillon, Adolfo Meza, Susan Pede, Drew Terry
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Publication number: 20140088450Abstract: A system automatically detects peaks in signal by generating a zero-mean data sequence of the signal comprising a data sequence and filtering the zero-mean data sequence. The entropy of the filtered data sequence is determined and peaks are detected in the entropy data sequence.Type: ApplicationFiled: September 25, 2013Publication date: March 27, 2014Applicant: Samsung Electronics Co., Ltd.Inventors: Sabarimalai Manikandan MOTTAIYAN, Saurabh TYAGI
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Publication number: 20140074407Abstract: The present invention relates to a device and method for estimating energy expenditure during exercise. The device includes a module for estimating whether a person is exceeding their anaerobic threshold and, if they are exceeding their anaerobic threshold calculating the additional energy expenditure due to the anaerobic metabolism of ATP. The additional energy expenditure can then be added to an estimate of the energy expenditure due to aerobic metabolism and output to the user in order to provide an estimate of the energy expenditure occurring during anaerobic exercise.Type: ApplicationFiled: September 9, 2013Publication date: March 13, 2014Applicant: TOUMAZ HEALTHCARE LIMITEDInventors: Miguel HERNANDEZ-SILVEIRA, Su-Shin ANG
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Publication number: 20140073982Abstract: A method and system for R-R interval measurement of a user are disclosed. In a first aspect, the method comprises detecting an electrocardiogram (ECG) signal of the user. The method includes performing QRS peak detection on the ECG signal to obtain a low resolution peak and searching near the low resolution peak for a high resolution peak. The method includes calculating the R-R interval measurement based upon the high resolution peak. In a second aspect, a wireless sensor device comprises a processor and a memory device coupled to the processor, wherein the memory device includes an application that, when executed by the processor, causes the processor to carry out the steps of the method.Type: ApplicationFiled: September 7, 2012Publication date: March 13, 2014Applicant: VITAL CONNECT, INC.Inventors: Yun YANG, Ravi NARASIMHAN, Nima FERDOSI
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Publication number: 20140058280Abstract: Health monitoring devices allow for monitoring of the vital signs of a subject. Wireless devices can enable a subject's cardiac and/or respiratory functions to be monitored remotely, e.g. without the subject being attached to bedside equipment. A cardiac monitoring device may include a substrate, electrodes for measuring ECG signals, and an electronics module including a data processor and a wireless transmitter. The electronics module is sealed within the substrate and arranged to receive the measured ECG signals. Each ECG signal associated with a heartbeat is processed in the data processor to provide key data relating to that heartbeat. The key data may include the temporal position of a characteristic feature in the ECG signal. The key data is provided to the wireless transmitter for transmission.Type: ApplicationFiled: February 3, 2012Publication date: February 27, 2014Applicant: Isansys Lifecare LimitedInventors: Anthony Chefles, Rory Morrison, Rebecca Weir, Keith Errey
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Publication number: 20140039336Abstract: The present invention uses electrical stimulation of the vagus nerve to treat epilepsy with minimized or no effect on the heart. Treatment is carried out by an implantable signal generator, one or more implantable electrodes for electrically stimulating a predetermined stimulation site of the vagus nerve, and a sensor for sensing characteristics of the heart such as heart rate. The heart rate information from the sensor can be used to determine whether the vagus nerve stimulation is adversely affecting the heart. Once threshold parameters are met, the vagus nerve stimulation may be stopped or adjusted. In yet another embodiment, the invention may be simply a modified pacemaker having circuitry that determines whether a vagus nerve is being stimulated. In the event that the vagus nerve is being stimulated, the modified pacemaker may control the heart to maintain it within desired conditions during the vagus nerve stimulation.Type: ApplicationFiled: October 7, 2013Publication date: February 6, 2014Applicant: FLINT HILLS SCIENTIFIC, LLCInventors: Ivan OSORIO, Mark G. FREI
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Publication number: 20140031709Abstract: Detecting cardiac ischemia by detecting local changes in high frequency ECG parameters. Local changes may be, for example, local reduction in RMS of high frequency components, for example, during a stress test.Type: ApplicationFiled: September 10, 2013Publication date: January 30, 2014Applicant: BSP Biological Signal Processing Ltd.Inventors: Eran TOLEDO, Amir Beker, Orna Bregman-Amitai
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Patent number: 8620416Abstract: An implantable medical device monitors ST segment data collected from EGM. ST trends are established and monitored over time. The IMD is able to discern whether the data indicate supply ischemia, demand ischemia, or other physiological causes. The IMD is then able to provide appropriate information and alerts.Type: GrantFiled: January 18, 2011Date of Patent: December 31, 2013Assignee: Medtronic, Inc.Inventors: Zhendong Song, Steven N. Lu, Shailesh K. V. Musley, Eduardo N. Warman
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Publication number: 20130338519Abstract: An apparatus and method for determining a signal quality of an input signal representing a repetitious phenomena derived from at least one sensor connected to a patient is provided. A detector receives the input signal and determines data representing the repetitious phenomena from the input signal for use in determining at least one patient parameter. A measurement processor is electrically coupled to the detector that determines a first signal quality value by identifying at least one feature of the repetitious phenomena data and compares the at least one feature of a first set of the determined repetitious phenomena data with a second set of the determined repetitious phenomena data to determine a feature variability value and using the feature variability value to determine a stability value representative of the quality of the input signal.Type: ApplicationFiled: March 22, 2012Publication date: December 19, 2013Inventors: Yu Chen, Zhe Zhang
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Patent number: 8606353Abstract: A method, medium, and apparatus measuring biological signals using a multi-electrode module, with a lead search method. An apparatus for measuring biological signals by using a multi-electrode module, includes a multi-electrode module having a non-conductive patch and a sensor array including a ground electrode and a plurality of individual electrodes, an electrode selection unit selecting a plurality of electrode pairs including a reference electrode and a measurement electrode from the plurality of individual electrodes depending on a type of the biological signal to be measured, and a signal processing unit for obtaining the biological signals from the plurality of electrode pairs.Type: GrantFiled: June 17, 2005Date of Patent: December 10, 2013Assignee: Samsung Electronics Co., Ltd.Inventors: Hyung-sok Yeo, Jeong-whan Lee, Mi-jeong Song, Sung-Cheol Kim, Jin-sang Hwang
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Patent number: 8600485Abstract: While analyzing ventricular repolarization in accordance with the invention, ECG measurement with excitation of heart rate is evaluated and the coupling of an internal parameter, for example QT to heartbeat interval, for example RR, is modeled by a transfer function with three parameters. The values of the resulting five parameters describing the static and dynamic characteristics of ventricular repolarization are obtained by means of transfer function parameters and the measured values of heart rate and the internal parameter. The effect of medication is evaluated from the difference of the values of these parameters determined before and after administrating the medication.Type: GrantFiled: June 2, 2008Date of Patent: December 3, 2013Assignee: Institute of Scientific Instruments of the ASCR, V.V.I.Inventors: Josef Halamek, Pavel Jurak
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Patent number: 8600490Abstract: A two-dimensional refractory period is defined in conjunction with the detection of cardiac events. Detection parameters associated with the two-dimensional refractory period may define a period of time during which a sensed cardiac signal is blanked or may define a period of time during which a given sensing threshold applies. The two-dimensional refractory period may be employed in atrial sensing to selectively blank far-field T-waves while enabling P-wave detection. The two-dimensional refractory period may be employed in ventricular sensing to selectively blank near-field T-waves while enabling detection of the QRS complex. The detection parameters associated with the two-dimensional refractory period may be adapted based on characteristics of previously detected cardiac signals.Type: GrantFiled: November 21, 2007Date of Patent: December 3, 2013Assignee: Pacesetter, Inc.Inventors: Rupinder Bharmi, Jeffery D. Snell
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Patent number: 8583221Abstract: A medical device system senses cardiac signals and generates and stores sensing data including sensed cardiac events. A processor receiving the sensing data is configured to detect undersensed and oversensed events. The processor generates an episode display comprising event identifying codes in response to the received sensing data and produces an adjusted episode display in response to an event being identified as an undersensed event or an oversensed event.Type: GrantFiled: April 26, 2012Date of Patent: November 12, 2013Assignee: Medtronic, Inc.Inventors: Amisha S. Patel, Bruce D. Gunderson, Mark L. Brown
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Publication number: 20130296693Abstract: A method for determining the location of a medical device within a body is provided. The method includes transmitting from the medical device an acoustic signal; receiving with the medical device a reflected acoustic signal; advancing the medical device based on a first algorithm, the first algorithm including a first weighting factor and a first feature extracted from the reflected acoustic signal; determining a first location of the medical device based on the first algorithm; and moving the medical device to a second location based on a second algorithm, the second algorithm based on the determined first location and including at least one of a second weighting factor and a second feature extracted from the reflected acoustic signal. Also disclosed are systems and devices for performing the methods described herein.Type: ApplicationFiled: March 14, 2013Publication date: November 7, 2013Inventors: Brian J. WENZEL, Kichang Lee, Stephen P. Hanlon, Miroslav Navratil, Jin Jiang
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Publication number: 20130296667Abstract: A system for monitoring a cardiac characteristic. The system including: a sensor patch adhered to a surface of the skin which includes: a patch body having a surface and an adhesive, the patch body further having a cavity; a sensor disposed in the cavity and configured for detecting the cardiac characteristic; a transmitter connected to the sensor for transmitting a signal representative of the cardiac characteristic; and a power source disposed in the cavity for powering the sensor and transmitter; and a receiver for receiving or monitoring the signal from the transmitter and outputting information associated with the cardiac characteristic. The receiver can be a cellular phone having an application used to receive the signal from the transmitter and generate the information associated with the cardiac characteristic. The cardiac characteristic can be a cardiac abnormality or useful in monitoring or providing feedback to the user while exercising.Type: ApplicationFiled: May 5, 2012Publication date: November 7, 2013Applicant: OMNITEK PARTNERS LLCInventors: Jahangir S. Rastegar, Thomas Spinelli
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Patent number: 8577449Abstract: Disclosed are systems and methods for automatically determining ST windows for ischemia detection. An IEGM signal is obtained over a period of time a derivative signal of the IEGM signal is calculated. The R-wave is identified in the derivative signal and the derivative signal data following the identified R-wave is analyzed to find portions of the derivative signal comprising samples having lower values than a predetermined threshold. Further, a portion of the derivative signal including samples having lower values than the threshold is determined to correspond to a ST window for that cardiac cycle if that portion fulfills predetermined requirements. A reference ST window based on a number of determined ST windows is determined. Using the reference ST window, ischemia can be detected by comparing IEGM data in the reference ST window with current IEGM data from a segment of the IEGM signal corresponding to the reference ST window.Type: GrantFiled: June 20, 2012Date of Patent: November 5, 2013Assignee: St. Jude Medical ABInventor: Anders Bjorling
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Patent number: 8577442Abstract: A magnetic resonance imaging apparatus includes a data acquisition unit and an image generating unit. The data acquisition unit sets a delay time from a reference wave based on heart rate information or peripheral pulse wave information previously acquired from an object and acquires MR signals by an imaging scan with a delay time and in synchronization with a blood flow beat. The delay time represents a time phase for image data acquisition timing in synchronization with the beat. The image generating unit generates a blood flow image based on the magnetic resonance signals.Type: GrantFiled: February 3, 2010Date of Patent: November 5, 2013Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems CorporationInventor: Mitsue Miyazaki
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Publication number: 20130289428Abstract: A medical device system senses cardiac signals and generates and stores sensing data including sensed cardiac events. A processor receiving the sensing data is configured to detect undersensed and oversensed events. The processor generates an episode display comprising event identifying codes in response to the received sensing data and produces an adjusted episode display in response to an event being identified as an undersensed event or an oversensed event.Type: ApplicationFiled: April 26, 2012Publication date: October 31, 2013Inventors: Amisha S. Patel, Bruce D. Gunderson, Mark L. Brown
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Publication number: 20130289426Abstract: Methods, systems, and computer-readable and executable instructions are provided for classifying an electrocardiogram (ECG) signal. Classifying an ECG signal can include analyzing the ECG signal using a stream of pulses generated by a sampler, extracting cardiac pulse features from a timing of the stream of pulses, and classifying the ECG signal based on the extracted cardiac pulse feature.Type: ApplicationFiled: April 30, 2012Publication date: October 31, 2013Inventors: Choudur K. Lakshminarayan, Alexander Singh Alvarado, Jose Carlos Principe
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Patent number: 8560055Abstract: A heart rate monitor generates an ST deviation time series by employing a recursive filter that is preferably an exponential average filter whose output is a weighted sum of the then existing ST time series value and current ST deviation values of analyzable beats. Beats are detected in segments of data. ST deviation is measured for analyzable beats. The ST deviation time series is updated only if certain criteria are met. A first criterion for updating the time series is that at least half of the beats within a segment must be normal sinus rhythm beats. A second criterion for updating the time series is that (i) the average RR interval of the segment is between ¾ and 1.5 times the average RR interval of the previous segment; or (ii) both (a) the number of abnormal beats in the current segment is less than 2, and (b) the number of premature ventricular contractions within the current segment is less than 2.Type: GrantFiled: February 9, 2010Date of Patent: October 15, 2013Assignee: Angel Medical Systems, Inc.Inventors: Steven R. Johnson, Bruce Hopenfeld
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Publication number: 20130261482Abstract: A method, system, apparatus and device for processing an ECG signal to remove or reduce noise from the ECG signal attributable to EMG and/or motion artifacts. The novel algorithm common to all aspects of the device can include wavelet decomposing an ECG signal to produce a set of approximation coefficients and a plurality of sets of detail coefficients, locally fitting subsets of the set of approximation coefficients to second order polynomials, adjusting the set of approximation coefficients by the locally fitted second order polynomials, setting some of the detail coefficients to zero, and reconstructing an ECG signal with reduced noise based on the modified set of approximation coefficients and the modified plurality of sets of detail coefficients.Type: ApplicationFiled: March 12, 2013Publication date: October 3, 2013Applicant: QUALCOMM IncorporatedInventors: Pina MARZILIANO, Amrish NAIR
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Publication number: 20130261481Abstract: Techniques are provided for discriminating episodes of cardiac ischemia indicated based on shifts in ST segment elevation from false detections due to atrial fibrillation (AF) or other confounding factors such as premature ventricular contractions (PVCs.) In an example for use with a single-chamber device, in response to a possible ischemic event, the single-chamber device assesses ventricular stability based an examination of ventricular intracardiac electrogram (IEGM) signals. If the ventricular IEGM is unstable due to paroxysmal AF or frequent PVCs, the ischemic event is rejected as a false detection. Otherwise, the device responds to the event by, for example, generating warning signals, recording diagnostic data or controlling device therapy. The stability discrimination techniques are particularly advantageous for use within single-chamber devices that lack automatic mode switching but are also beneficial within at least some dual-chamber devices or multi-chamber systems.Type: ApplicationFiled: March 29, 2012Publication date: October 3, 2013Applicant: PACESETTER, INC.Inventors: Kathleen Kresge, Carol Hudgins, Peter Chelius
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Publication number: 20130245477Abstract: A method for detecting an R-wave from an ECG signal (x(t)) derived from a living body, the method comprising the steps of (a) acquiring the ECG signal from the living body, (b) digitizing the ECG signal into a digital ECG signal (x(ti)), (c) filtering the digital ECG signal with a bandpass filter (53) and applying an absolute value filter (55) thereto to create a filtered ECG signal (g(ti)), (d) for each sequential value of the filtered ECG signal, comparing (57) the filtered ECG signal to an ECG tracking threshold (TT), (e) if the filtered ECG signal is no greater than TT, incrementing a counter (59), but if greater than TT, setting the counter to zero; and (f) comparing (63) the counter to a predetermined refractory count RC and, if the count is equal to RC, outputting an R-wave trigger indicating that an R-wave has been detected.Type: ApplicationFiled: September 7, 2012Publication date: September 19, 2013Applicant: APN HEALTH, LLCInventors: Donald Brodnick, David G. Jansson
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Publication number: 20130245478Abstract: A system for adaptively processing patient monitoring signals comprises an input processor for acquiring a signal having amplitude representing electrical activity of a patient heart over time. A signal processor identifies different portions of the signal associated with different phases of cardiac activity by, inverting the signal to provide an inverted signal, aligning the signal and the inverted signal in amplitude during a cardiac rest portion and identifying one or more of the different portions in response to an intersection point of the signal and the inverted signal. Multiple adaptive signal filters are used to filter multiple bandwidths of corresponding different portions of the signal.Type: ApplicationFiled: February 6, 2013Publication date: September 19, 2013Applicant: Siemens Medical Solutions USA, Inc.Inventor: Hongxuan Zhang
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Publication number: 20130245480Abstract: An electrocardiographic device for sensing cardiac activity in a user, the electrocardiographic device comprising: plurality of electrodes provided at a surface of the device for electrical engagement with a pair of extremities of a user; one or more movement sensors arranged to, in use, detect movement of a user's extremities; and a control unit configured to receive electrical signals from the electrodes and to, in use, process said signals in dependence on the output of the one or more movement sensors so as to filter variations from the signals due to movement of the user's extremities.Type: ApplicationFiled: May 3, 2013Publication date: September 19, 2013Applicant: Cardiocity LimitedInventor: Chris Crockford
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Publication number: 20130245479Abstract: Disclosed are an apparatus and a method for removing noise from biosignals. An embodiment of the invention provides an apparatus for removing noise from biosignals measured for a particular period of time that includes: a similarity calculating unit configured to calculate a similarity between any one biosignal from among the biosignals and other biosignals; and a noise removal unit configured to remove noise from the any one biosignal by using the similarity. Aspects of the invention provide the advantage of effectively removing noise from biosignals without distorting the waveforms of the biosignals.Type: ApplicationFiled: February 26, 2013Publication date: September 19, 2013Applicant: Industry-Academic Cooperation Foundation Yonsei UniversityInventors: Do-Sik Hwang, Ung Jang, Ji-han Kim
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Patent number: 8538524Abstract: A device senses cardioelectrical signals using a right atrial (RA) lead, which might include far-field R-waves as well as near-field P-waves. The device concurrently senses events using a proximal electrode of an LV lead, which can sense both P-waves and R-waves as substantially near-field events. Suitable templates are then applied to the signals sensed via the proximal LV electrode to identify the origin of the signals (e.g. atrial vs. ventricular) so as to properly classify the corresponding events sensed in the RA as near-field or far-field events. In this manner, far-field oversensing is conveniently detected.Type: GrantFiled: September 12, 2011Date of Patent: September 17, 2013Assignee: Pacesetter, Inc.Inventors: Stuart Rosenberg, Tomas Svensson, Kjell Norén, Edward Karst, Kyungmoo Ryu
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Publication number: 20130237874Abstract: A mobile system for analyzing ECG data includes an analog front end module coupled to a mobile consumer device. The analog front end module is configured to collect ECG data from one or more leads and is operable to convert the analog ECG data to digital ECG data. The mobile consumer device is coupled to receive the digital ECG data, and is configured to perform QRS detection using a filter whose cutoff frequency is adapted to noise level in real time. The ECG signal is amplified non-linearly and three windowed threshold signals (D, E, J) are derived. The cutoff frequency for the QRS detection is dynamically selected as a function of the threshold signals. A sample in the amplified signal is identified to be a heart beat point only when the sample value is equal to the first threshold signal and greater than the filtered threshold signal.Type: ApplicationFiled: March 29, 2012Publication date: September 12, 2013Applicant: Texas Instruments IncorporatedInventor: Vasile Zoicas
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Publication number: 20130231578Abstract: An electrocardiogram analysis report simultaneously displays an electrocardiogram waveform collected from a subject and information about a measurement value calculated from the electrocardiogram waveform. The electrocardiogram analysis report includes a frontal plane display region configured to display a limb leads waveform included in the electrocardiogram waveform and information about a measurement value calculated from the limb leads waveform, and a horizontal plane display region configured to display a chest lead waveform included in the electrocardiogram waveform and information about a measurement value calculated from the chest lead waveform, wherein the information about the measurement value is displayed at a position spaced apart by a distance corresponding to a size of the measurement value in a direction from a predetermined center point to the relevant lead waveform in the frontal plane display region and the horizontal plane display region.Type: ApplicationFiled: February 19, 2013Publication date: September 5, 2013Applicant: Nihon Kohden CorporationInventors: Tsuneo Takayanagi, Jiro Suto, Ryoko Kamiya, Teiji Ukawa, Hiroko Hagiwara, Rie Muneshima
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Publication number: 20130218037Abstract: Disclosed is an apparatus and method for ambulatory, real-time detection of removal of ectopic beats by obtaining consecutive patient heartbeats, and recognizing an ectopic beat by detecting a signature short-long sequence in an interbeat interval of the obtained heartbeats, with the signature short-long sequence including an ectopic coupling interval followed by a compensatory pause between RR intervals.Type: ApplicationFiled: March 15, 2013Publication date: August 22, 2013Applicant: The Research Foundation of State University of New YorkInventor: The Research Foundation of State University of New York
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Patent number: 8509883Abstract: A method for identifying R waves in an ECG signal is proposed. An ECG measuring instrument measures ECG signals of a patient in which R waves are to be detected. The measured ECG signals are compared with respective reference quantities based on at least two comparison rules. The second comparison rule is dependent on a result of a first comparison conducted according to a first comparison rule. A signal that an R wave has been detected is issued if the first and the second comparison rules are fulfilled. Making the second comparison rule dependent on the result of the first comparison rule enables an adept response to changes of measurement conditions. These changes can be taken into account in further comparisons. Therefore the detection of R waves in an ECG signal can be optimized, leading to an improvement in the image quality in ECG-triggered MR examinations.Type: GrantFiled: June 23, 2011Date of Patent: August 13, 2013Assignee: Siemens AktiengesellschaftInventor: JĂ¼rgen Rössler
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Patent number: 8504144Abstract: Techniques for detecting tachyarrhythmia and also for preventing T-wave oversensing use signals filtered by a narrowband bradycardia filter in combination with signals filtered by a narrowband tachycardia filter. A separate wideband filter may also be used.Type: GrantFiled: July 11, 2007Date of Patent: August 6, 2013Assignee: Pacesetter, Inc.Inventors: Rupinder Bharmi, Jeffery D. Snell, Gene A. Bornzin, Joseph J. Florio, Peter Boileau
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Publication number: 20130190635Abstract: A calibration method of electrocardiogram signals and the application program for the same. The method comprises steps of receiving an uncalibrated/unidentified electrocardiogram signal of a user, calculating the ratio of the distance length of an uncalibrated/unidentified electrocardiogram signal and the distance length of an electrocardiogram template, then generating a trigonometric value which corresponds with a trigonometric projection degree according to the ratio. Next step is to set a characteristic point of the uncalibrated electrocardiogram signal as an axis anchor point of the trigonometric projection for attaining a displacement. Lastly, perform the calibration on the unidentified electrocardiogram signal according to the generated trigonometric value which corresponds with trigonometric projection degree and the attained displacement. Then perform identification comparison of the unidentified electrocardiogram signal and the saved electrocardiogram template for further authorization.Type: ApplicationFiled: April 25, 2012Publication date: July 25, 2013Inventors: Tsu-Wang SHEN, Shan-Chun Chang
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Publication number: 20130190638Abstract: Technologies are provided herein for real-time detection of motion and noise (MN) artifacts in electrocardiogram signals recorded by electrocardiography devices. Specifically, the present disclosure provides techniques for increasing the accuracy of identifying paroxysmal atrial fibrillation (AF) rhythms, which are often measured via such devices. According to aspects of the present disclosure, a method for detecting MN artifacts in an electrocardiogram (ECG) recording includes receiving an ECG segment and decomposing the received ECG segment into a sum of intrinsic mode functions. The intrinsic mode functions associated with MN artifacts present within the ECG segment are then isolated. The method further includes determining randomness and variability characteristic values associated with the isolated intrinsic mode functions and comparing the randomness and variability characteristic values to threshold randomness and variability characteristic values.Type: ApplicationFiled: October 12, 2011Publication date: July 25, 2013Inventors: Ki H. Chon, Jinseok Lee
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Publication number: 20130190636Abstract: A system comprises a cardiac signal sensing and a processing circuit. The cardiac signal sensing circuit senses a first cardiac signal segment that includes a QRS complex and a second cardiac signal segment that includes a fiducial indicative of local ventricular activation. The processor circuit includes a site activation timer circuit configured to determine a time duration between a fiducial of the QRS complex of the first cardiac signal segment and the fiducial of the second cardiac signal segment. The processor circuit is configured to generate, using the determined time duration, an indication of optimality of placement of one or more electrodes for delivering therapy and provide the indication to at least one of a user or process.Type: ApplicationFiled: July 19, 2012Publication date: July 25, 2013Inventors: Shibaji Shome, Pramodsingh Hirasingh Thakur, Yinghong Yu, Keith L. Herrmann, Aaron R. McCabe, Jiang Ding
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Publication number: 20130190637Abstract: An analyzer automatically analyzes both, a common portion of multiple successive heart cycles of electrophysiological signal data synchronized with respect to a P wave and a common portion of multiple successive heart cycles of the signal data synchronized with respect to an R wave, to identify changes occurring in amplitude value and time duration of the common portion of the multiple successive heart cycles of the signal data. A display processor initiates generation of at least one display image showing the common portion of the multiple successive heart cycles synchronized in time, adjacent and mutually vertically displaced to facilitate visual comparison and highlighting an identified change by a visual attribute.Type: ApplicationFiled: November 7, 2012Publication date: July 25, 2013Applicant: SIEMENS MEDICAL SOLUTIONS USA, INC.Inventor: Siemens Medical Solutions USA, Inc.
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Patent number: 8491481Abstract: A method of measuring the instantaneous period of a quasi-periodic signal includes determining an initial template, performing a cross-correlation between the initial template and a quasi-periodic signal and selecting portions of the signal that correspond to the peaks of the correlation signal. The selected portions are then averaged and another cross correlation is performed between the quasi-periodic signal and a template including the averaged selected portions. The instantaneous period is then measured from the correlation signal.Type: GrantFiled: January 29, 2009Date of Patent: July 23, 2013Assignee: General Electric CompanyInventor: Serguei Kabakov
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Publication number: 20130165805Abstract: A method of controlling of an R-peak detection apparatus, which detects an R-peak from an ElectroCardioGram (ECG) signal, includes receiving the ECG signal, reading out a pre-stored ECG template, comparing the EG signal with the pre-stored ECG template to determine a similarity between the ECG signal and the pre-stored ECG template and determining whether the similarity is equal to or greater than a threshold value, and determining a corresponding interval as the R-peak when the similarity is equal to or greater than the threshold value.Type: ApplicationFiled: December 21, 2012Publication date: June 27, 2013Applicants: Industry-Academic Cooperation Foundation Yonsei University, Samsung Electronics Co., Ltd.Inventors: Samsung Electronics Co., Ltd., Industry-Academic Cooperation Foundation Yonsei University
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Patent number: 8467859Abstract: The invention relates to a method and a device for deriving and evaluating cardiovascular information from curves of the cardiac current, in particular for applications in telemedicine. According to the invention, for data reduction purposes, a mean value and a standard deviation across the whole recording time are initially determined from a recorded ECG from the high-resolution signal, after which the RR intervals are assessed by means of an identification algorithm and only the results obtained are transmitted and/or recorded, for the purpose of data reduction.Type: GrantFiled: September 4, 2007Date of Patent: June 18, 2013Assignee: Telozo GmbHInventors: Manfred Krauss, Joachim Schlund, Olaf Hartmann, Jörg Schubert
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Publication number: 20130150743Abstract: A heartbeat signal processor includes a first and second electrodes to obtain a first and second heartbeat signals, a DC voltage calculating unit and an AC amplitude calculating unit to calculate first and second average DC voltage values of direct-current components and first and second average AC amplitude values of alternate-current components in the first and second heartbeat signals, a correlation coefficient calculating unit to calculate a correlation coefficient between the alternate-current components in the first and second heartbeat signals, an amplification factor setting unit to set an amplification factor on the basis of the first and second average DC voltage values, the first and second average AC amplitude values, and the correlation coefficient, and a signal generating unit to generate a differential heartbeat signal by amplifying the first or second heartbeat signal on the basis of the amplification factor and calculating a difference between the first and second heartbeat signals.Type: ApplicationFiled: December 11, 2012Publication date: June 13, 2013Applicant: FUJITSU LIMITEDInventor: FUJITSU LIMITED
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Publication number: 20130144181Abstract: Methods, apparatuses, and systems for quantifying fatigue of a subject are disclosed. The methods may include measuring an electrocardiogram (ECG) signal from the subject. The methods may further include calculating, with a processing device, a Heart Rate Variability (HRV) metric in response to the ECG signal. The methods may additionally include calculating, with a processing device, a fatigue level in response to the HRV metrics.Type: ApplicationFiled: April 14, 2011Publication date: June 6, 2013Inventors: Donovan L. Fogt, John E. Kalns, Darren J. Michael, William H. Cooke
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Patent number: 8457728Abstract: A medical device system and method for monitoring a cardiac signal in a patient senses ventricular R-waves and computes a morphology metric of an R-wave and a corresponding preceding morphology metric of a preceding R-wave. One of a difference and a ratio of the R-wave morphology metric and the preceding R-wave morphology metric is compared to an established detection threshold for discriminating premature ventricular contractions from premature atrial contractions. A cardiac signal measurement is computed from the sensed R-waves in response to detecting a premature ventricular comparison based on the comparison.Type: GrantFiled: May 9, 2011Date of Patent: June 4, 2013Assignee: Medtronic, Inc.Inventors: Raphael Schneider, Raja N. Ghanem
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Patent number: 8447391Abstract: A detection method for detecting a QRS wave is disclosed. An electrocardiogram (ECG) signal is provided. The ECG signal is enhanced to generate a processed signal. A first crest of the processed signal is determined. Each crest following the first crest is defined as a second crest. The level of each second crest is higher than a first threshold value. The result of defining the second crest is utilized to determine whether the QRS wave has occurred and approached a first crest.Type: GrantFiled: June 3, 2009Date of Patent: May 21, 2013Assignee: Industrial Technology Research InstituteInventor: Chun-Te Chuang
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Patent number: 8442624Abstract: A system for heart performance characterization and abnormality detection processes a heart electrical activity signal in determining multiple first signal characteristic values over multiple heart cycles. A first signal characteristic value substantially comprises a time interval between a peak of a P wave to a peak of a succeeding R wave representing a repolarization time interval in an individual heart cycle and the signal processor uses a peak detector and time detector for identifying the peaks and detecting a time difference between the identified peaks. A comparator compares at least one of the multiple first signal characteristic values or a value derived from the multiple first signal characteristic values with a threshold value to provide a comparison indicator. A patient monitor in response to the comparison indicator indicating a calculated signal characteristic value exceeds the threshold value, generates an alert message associated with the threshold.Type: GrantFiled: January 7, 2011Date of Patent: May 14, 2013Assignee: Siemens Medical Solutions USA, Inc.Inventor: Hongxuan Zhang
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Publication number: 20130116587Abstract: A cardiac-activity based prediction of a rapid drop in a patient's blood pressure during extracorporeal blood treatment is disclosed. A proposed alarm apparatus includes a primary beat morphology analysis unit bank of secondary analysis units and an alarm generating unit. The primary beat morphology analysis unit discriminates heart beats in a received basic electrocardiogram signal, classifies each beat into one out of at least two different beat categories, and associates each segment of the signal with relevant event-type data. The event-type data and the basic electrocardiogram signal together form an enhanced electrocardiogram signal, based upon which the primary beat morphology analysis unit determines whether one or more secondary signal analyses should be performed.Type: ApplicationFiled: October 5, 2012Publication date: May 9, 2013Applicant: Gambro Lundia ABInventor: Gambro Lundia AB
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Publication number: 20130116588Abstract: A microprocessor configured to receive and process digitized signals derived from an analogue ECG signal is provided. An example microprocessor comprises a beat detection unit configured to receive the in-phase and quadrature phase band power signals, calculate a band power value and an adaptive threshold value, and compare said band power value with said adaptive threshold value to detect a QRS complex of the ECG signal indicative of a detected valid beat; and an R peak detection unit configured to receive the digital ECG signal and information about the detected valid beat, select a portion of the received ECG signal as a first time window around the detected valid beat; determine the location of a first R peak position; and perform a time domain search in a second time window around said first R peak position in order to refine the location of an R peak position.Type: ApplicationFiled: November 1, 2012Publication date: May 9, 2013Applicant: IMECInventor: IMEC
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Patent number: 8406864Abstract: A method of assessing contractility of a cardiac muscle which has at least one activation parameter, the method comprising: (a) utilizing time correlated data pertaining to at least one activation parameter to produce a profile of said parameter; (b) identifying from measurement of said at least one parameter a time interval during which interference from an artificial signal occurs; (c) ameliorating effects of said interference; and (d) analyzing changes in said profile to generate an indication of contractility, as a function of time to generate a cardiac activation profile.Type: GrantFiled: February 4, 2007Date of Patent: March 26, 2013Assignee: Impulse Dynamics NVInventors: Benny Rousso, Eyal Lebanony, David Prutchi, Ophir Bitton
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Publication number: 20130066222Abstract: A device senses cardioelectrical signals using a right atrial (RA) lead, which might include far-field R-waves as well as near-field P-waves. The device concurrently senses events using a proximal electrode of an LV lead, which can sense both P-waves and R-waves as substantially near-field events. Suitable templates are then applied to the signals sensed via the proximal LV electrode to identify the origin of the signals (e.g. atrial vs. ventricular) so as to properly classify the corresponding events sensed in the RA as near-field or far-field events. In this manner, far-field oversensing is conveniently detected.Type: ApplicationFiled: September 12, 2011Publication date: March 14, 2013Applicant: PACESETTER, INC.Inventors: Stuart Rosenberg, Tomas Svensson, Kjell Norén, Edward Karst, Kyungmoo Ryu
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Patent number: 8391962Abstract: Systems and Methods for stratifying relative risks of adverse cardiac events by processing a duration of electrocardiograph recordings generally recorded by a Holter type of device. The duration of electrocardiograph recordings are processed to resolve RR interval related data, QT interval related data, and are fitted to formulas to at least partially establish fitting related measures. The fitting formulas incorporate circadian related periodic factors, and can further incorporate additional processing including utilizing Lissajous analysis techniques, among others.Type: GrantFiled: May 13, 2009Date of Patent: March 5, 2013Inventor: Mari Alford Watanabe
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Patent number: 8386024Abstract: A method for identifying and classifying various types of oversensing in implantable medical devices (IMDs), such as implantable cardioverter defibrillators (ICDs), to assist a physician in choosing corrective action to reduce the likelihood of oversensing and inappropriate therapy delivery. Far-field electrogram (EGM) signals are analyzed to detect the occurrence of R-waves, and the result is compared to the number and pattern of R-waves sensed by the IMD and indicated on the marker channel. A marker channel with more sensed R-waves than indicated by analysis of the far-field EGM indicates the presence of oversensing, including double-counting of R-waves, T-wave oversensing, lead malfunction or failure, poor lead connections, noise associated with electromagnetic interference, non-cardiac myopotentials, etc.Type: GrantFiled: June 2, 2009Date of Patent: February 26, 2013Assignee: Medtronic, Inc.Inventors: Bruce D. Gunderson, Amisha S. Patel, Chad A. Bounds, Mark L. Brown