Detecting R Portion Of Signal Waveform Patents (Class 600/521)
  • Patent number: 10426406
    Abstract: Methods, noise detection devices, and differential voltage measuring systems are provided for detecting noise signals for the purpose of measuring cardiac movements in a patient. In the method, contact is made with the patient by at least two measuring electrodes having at least one associated measuring channel. Furthermore, a heartbeat measurement is performed. During the heartbeat measurement, signals from the patient are detected over the at least one measuring channel. Then, a check is made of whether the detected signals have been caused by noise by comparing the detected signals with at least one heartbeat type that was identified in the course of the learning procedure.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: October 1, 2019
    Assignee: Siemens Healthcare GmbH
    Inventor: Ulrich Batzer
  • Patent number: 10413207
    Abstract: A system and method for detecting and verifying bradycardia/asystole episodes includes sensing an electrogram (EGM) signal. The EGM signal is compared to a primary threshold to sense events in the EGM signal, and at least one of a bradycardia or an asystole is detected based on the comparison. In response to detecting at least one of a bradycardia or an asystole, the EGM signal is compared to a secondary threshold to sense events under-sensed by the primary threshold. The validity of the bradycardia or the asystole is determined based on the detected under-sensed events.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: September 17, 2019
    Assignee: Medtronic, Inc.
    Inventors: Shantanu Sarkar, Michael Hudziak, Jerry Reiland, Erin Reisfeld
  • Patent number: 10188306
    Abstract: A cardiac potential detection device for detecting R-waves from an electrocardiographic waveform includes a plurality of electrodes, a detector, and a control unit. The detector detects an input voltage applied from the electrodes. The control unit identifies an R-wave based on the input voltage detected by the detector, but suspends identifying R-waves in a detection-suspension period including a period in which the input voltage exceeds a predetermined threshold.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: January 29, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Yoshifumi Hirose, Shoichi Araki
  • Patent number: 10159421
    Abstract: Methods and apparatus perform periodic breathing detection, such as Cheyne-Stokes respiration detection. The detection may be performed by one or more processors, such as by analysis of data from one or more sensors. In some cases, the detection may be based on an electrocardiogram (ECG) signal, such as from ECG electrodes and/or an accelerometer signal, such as from an accelerometer. An occurrence of periodic breathing may be detected based on features derived from the signal(s). For example, detection may be based on deriving a respiration signal from the sensed signal(s) and/or analysis of RR interval times or relative QRS amplitude values, which may be evaluated on a segment-by-segment basis. The detection may provide monitoring and reporting of the occurrence of periodic breathing by a monitoring device and/or provide a basis for controlling changes to a provided respiratory treatment or therapy, such as by a respiratory pressure therapy device.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: December 25, 2018
    Assignee: ResMed Sensor Technologies Limited
    Inventor: Conor Heneghan
  • Patent number: 10123716
    Abstract: A method and system for filtering a detected ECG signal are disclosed. In a first aspect, the method comprises filtering the detected ECG signal using a plurality of digital filters. The method includes adaptively selecting one of the plurality of digital filters to maintain a minimum signal-to-noise ratio (SNR). In a second aspect, the system comprises a wireless sensor device coupled to a user via at least one electrode, wherein the wireless sensor device includes a processor and a memory device coupled to the processor, wherein the memory device stores an application which, when executed by the processor, causes the processor to carry out the steps of the method.
    Type: Grant
    Filed: April 3, 2017
    Date of Patent: November 13, 2018
    Assignee: Vital Connect, Inc.
    Inventors: Ravi Narasimhan, Nersi Nazari, Nima Ferdosi
  • Patent number: 9955891
    Abstract: Systems and methods are provided to detect subwaveforms of an ECG waveform. Electrical impulses are detected between at least one pair of electrodes of two or more electrodes placed proximate to a beating heart and are converted to an ECG waveform for each heartbeat of the beating heart using the detector. One or more subwaveforms within P, Q, R, S, T, U, and J waveforms of the ECG waveform for each heartbeat or in an interval between the P, Q, R, S, T, U, and J waveforms that represent the depolarization or repolarization of an anatomically distinct portion of muscle tissue of the beating heart are detected using a signal processor. A processed ECG waveform that includes the one or more subwaveforms for each heartbeat is produced using the signal processor. The processed ECG waveform is received from the signal processor is displayed using a display device.
    Type: Grant
    Filed: May 10, 2016
    Date of Patent: May 1, 2018
    Inventor: Guangren Chen
  • Patent number: 9872630
    Abstract: A subcutaneously implantable cardiac medical device and a method of sensing a cardiac signal therein that includes a plurality of electrodes to sense a cardiac signal along a plurality of sensing vectors to detect a first interval and a second interval associated with a first detected event, and a processor configured to determine whether the first interval and the second interval are shorter than a predetermined threshold, determine whether the first interval and the second interval are similar, and determine, in response to the first interval and the second interval being similar, whether the sensed cardiac signal is either a noisy signal or a QRS signal.
    Type: Grant
    Filed: May 7, 2015
    Date of Patent: January 23, 2018
    Assignee: Medtronic, Inc.
    Inventors: Robert W Stadler, Raja N Ghanem, Xusheng Zhang
  • Patent number: 9642546
    Abstract: The present invention proposes a relaxation state evaluation system and method and a computer program product thereof. The method comprises steps: measuring ECG data of a user; analyzing the ECG data to generate a first, second, third and fourth parameters, wherein the first parameter is the short-scale entropy slope of the user before cardiovascular disease treatment (CVDT); the second parameter is the difference of the post-CVDT and pre-CVDT mean RR intervals; the third parameter is the logarithm of the variance of the pre-CVDT high frequency NN intervals; the fourth parameter is the logarithm of the ratio of the variances of the pre-CVDT low frequency and high frequency NN intervals; working out an evaluation index, which is a function of the abovementioned parameters; and evaluating the relaxation state of the user, wherein the user is determined to be in a relaxation state if the evaluation index is over a threshold.
    Type: Grant
    Filed: March 11, 2015
    Date of Patent: May 9, 2017
    Assignee: NATIONAL TSING HUA UNIVERSITY
    Inventors: Hung-Chih Chiu, Yi-Lwun Ho, Yen-Hung Lin, Hsi-Pin Ma, Tzung-Dau Wang, Chun-Chieh Chan, Hung-Chun Lu
  • Patent number: 9566032
    Abstract: A method of providing a graphical representation of sleep quality includes obtaining ECG data for a patient, obtaining a plurality of N-intervals from the ECG data, calculating a plurality of spectral densities based on the plurality of N-N intervals, wherein each spectral density is associated with one of a plurality of successive time windows and is calculated based on certain ones of the N-N intervals associated with the one of the plurality of successive time windows, and generating the graphical representation of sleep quality using the plurality of spectral densities.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: February 14, 2017
    Assignee: Koninklijke Philips N.V.
    Inventors: Saeed Babaeizadeh, Sophia Huai Zhou
  • Patent number: 9545203
    Abstract: Systems and methods are provided to display discrete conduction timing values of layers of the ventricles. Electrical impulses are detected using two or more electrodes placed proximate to a beating heart and are converted to an ECG waveform for each heartbeat of the beating heart. One or more subwaveforms within Q, R, S, and T waveforms of the ECG waveform for each heartbeat or in an interval between the Q, R, S, and T waveforms are detected that represent the depolarization or repolarization of anatomically distinct layers of the ventricles of the beating heart. A conduction timing value is calculated for each of the one or more subwaveforms for each electrode of the two or more electrodes for each heartbeat of the beating heart. At least one conduction timing value is displayed for at least one subwaveform for each electrode for at least one heartbeat of the beating heart.
    Type: Grant
    Filed: June 25, 2015
    Date of Patent: January 17, 2017
    Assignee: Guangren Chen
    Inventor: Guangren Chen
  • Patent number: 9538930
    Abstract: Systems and methods are provided to detect a multi-domain ECG waveform. Electrical impulses are detected between at least one pair of electrodes of two or more electrodes placed proximate to a beating heart and are converted to an ECG waveform for each heartbeat of the beating heart. The ECG waveform for at least one heartbeat is received from the detector, the ECG waveform is converted to a frequency domain waveform, the frequency domain waveform is separated into two or more different frequency domain waveforms using two or more different bandpass filters, and the two or more different frequency domain waveforms are converted into two or more different time domain waveforms. The two or more different time domain waveforms are displayed in the same time domain plot as a multi-domain ECG waveform for the at least one heartbeat.
    Type: Grant
    Filed: June 25, 2015
    Date of Patent: January 10, 2017
    Inventor: Guangren Chen
  • Patent number: 9421061
    Abstract: Far field reduction is carried out in a cardiac electrogram by extracting unipolar beats of an intracardiac electrogram that occur within a predetermined time interval that includes QRS peaks, constructing a first mean unipolar beat by averaging the extracted unipolar beats, and accepting unipolar beats that cross-correlate with the first mean unipolar beat. A second mean unipolar beat is constructed from the accepted unipolar beats. A ventricular far field component is determined from the extracted unipolar beats and subtracted from the intracardiac electrogram to distinguish a local component of the intracardiac electrogram.
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: August 23, 2016
    Assignee: Biosense Webster (Israel) Ltd.
    Inventors: Yaniv Ben Zriham, Roy Urman, Meir Bar-Tal, Richard P. M. Houben
  • Patent number: 9332910
    Abstract: An absentminded state determination apparatus includes: a data obtaining element for obtaining a time series data of a physiological characteristic value of a participant, wherein a fluctuation component is overlapped on the time series data, and depends on a state of the participant including normal and absentminded states; a detection element for detecting reflecting portions of the time series data, which reflect on the fluctuation component; a counting element for counting the number of the reflecting portions of the time series data in a determination time period between a determination time and a certain past time; and a determination element for determining according to the number of the reflecting portions at the determination time whether the participant is in the absentminded state. The determination time period has a predetermined time width from the certain past time to the determination time.
    Type: Grant
    Filed: October 3, 2012
    Date of Patent: May 10, 2016
    Assignees: DENSO CORPORATION
    Inventors: Shinya Matsunaga, Koji Oguri
  • Patent number: 9241647
    Abstract: Methods, systems, and apparatus for detecting the seizure in a patient using a medical device. The determination is performed by collecting cardiac data determining valid heart beats suitable for seizure detection from the cardiac data; calculating heart rate data of interest from the valid heart beats; and identifying a seizure event from the heart rate data. The medical device may then take a responsive action, such as warning, logging the time of the seizure, computing and storing one or more seizure severity indices, and/or treating the seizure.
    Type: Grant
    Filed: October 21, 2013
    Date of Patent: January 26, 2016
    Assignee: CYBERONICS, INC.
    Inventors: Ivan Osorio, Mark G. Frei
  • Patent number: 9226682
    Abstract: A system for processing electrocardiograph signals includes an interface and a processor. The interface provides a first electrocardiograph signal and a second electrocardiograph signal from an electrocardiograph to the processor. The processor receives the electrocardiograph signals, processes the first electrocardiograph signal to identify a feature of the signal, and processes the second electrocardiograph signal to identify energy over time (e.g., at various time instances), and identifies a first time instance of interest based on the feature.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: January 5, 2016
    Assignee: Siemens Aktiengesellschaft
    Inventors: Amit Kale, Venkata Suryanarayana
  • Patent number: 9199088
    Abstract: A system and method enables precise detection of the time of occurrence of a cardiac event of a heart. The method includes the steps of sensing electrical activity of the heart to generate an electrogram signal including the cardiac event, storing the electrogram signal, correlating the electrogram signal with an electrogram template, and identifying the time of occurrence of the cardiac event based upon the correlation.
    Type: Grant
    Filed: November 3, 2008
    Date of Patent: December 1, 2015
    Assignee: Pacesetter, Inc.
    Inventors: Rupinder Bharmi, Jeffery D. Snell
  • Patent number: 9179853
    Abstract: Devices and methods for analyzing cardiac signal data. An illustrative method includes identifying a plurality of detected events and measuring intervals between the detected events for use in rate estimation. In the illustrative embodiment, a set of intervals is used to make the rate estimation by first discarding selected intervals from the set. The remaining intervals are then used to calculate an estimated interval, for example by averaging the remaining intervals.
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: November 10, 2015
    Assignee: CAMERON HEALTH, INC.
    Inventors: Rick Sanghera, Venugopal Allavatam, Jay A. Warren, Mark R. Schroeder
  • Patent number: 9042971
    Abstract: A biometric monitoring device measuring various biometric information is provided that allows the person to take and/or display a heart rate reading by a simple user interaction with the device, e.g., by simply touching a heart rate sensor surface area or moving the device in a defined motion pattern. Some embodiments of this disclosure provide biometric monitoring devices that allow a person to get a quick heart rate reading without removing the device or interrupting their other activities. Some embodiments provide heart rate monitoring with other desirable features such as feedback on data acquisition status.
    Type: Grant
    Filed: January 13, 2014
    Date of Patent: May 26, 2015
    Assignee: Fitbit, Inc.
    Inventors: Christine Boomer Brumback, Nicholas Adrian Myers, Shelten Gee Jao Yuen, James Park, Todd Sutham Diemer
  • Patent number: 9042973
    Abstract: 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: Grant
    Filed: March 22, 2012
    Date of Patent: May 26, 2015
    Assignee: Draeger Medical Systems, Inc.
    Inventors: Yu Chen, Zhe Zhang
  • Publication number: 20150141774
    Abstract: A subject information detecting unit I1 includes a sensor mount I21, having an opening I22 at a portion to be in contact with a subject I91 and an internal cavity I23 communicated with the opening I22, the cavity defining a closed spatial structure in a state where the subject information detecting unit I1 is mounted on the subject such that the opening I22 faces the subject I91; a sensor I31 disposed on the sensor mount I21 and receiving pressure information deriving from pulsating signals in a blood vessel I92 in the subject I91, the sensor detecting the pulsating signals in the blood vessel in the subject; and a film member I11 separating the opening I22 from the sensor I31 and blocking the permeation of moisture. The sensor I31 detects the pressure information deriving from pulsating signals from the blood vessel I92 in the subject I91 and propagating through the opening I22, the cavity I23 and the film member I11.
    Type: Application
    Filed: January 27, 2015
    Publication date: May 21, 2015
    Applicants: Mitsubishi Chemical Holdings Corporation, Bifrostec Inc.
    Inventors: Hiroshi Ogawa, Atsushi Okumoto, Atsuo Takeuchi, Eiji Tanaka
  • Publication number: 20150133808
    Abstract: Provided is a non-invasive system for estimating an atrial signal, including a plurality of sensors to sense a surface electrocardiogram signal, a reference atrial signal generation unit to generate an estimated ventricular signal with respect to a R wave in an electrocardiogram signal from one sensor among the plurality of sensors, and to generate a reference atrial signal by subtracting the estimated ventricular signal from the electrocardiogram signal from the one sensor, and an atrial signal estimation unit to generate an estimated atrial signal by applying a constrained independent component analysis algorithm based on the reference atrial signal to the received surface electrocardiogram signal, and to estimate one of the estimated atrial signals as an actual atrial signal, and a method using the same.
    Type: Application
    Filed: August 28, 2014
    Publication date: May 14, 2015
    Applicants: THE ASAN FOUNDATION, KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Jong Min LEE, Yoha HWANG, Seung-Jong KIM, Kyoung Jae KIM, Hyeong-jin JEON, Gi-Byoung NAM, Yong-Giun KIM
  • Patent number: 9031645
    Abstract: Disclosed herein are various embodiments of methods, systems and devices for detecting atrial fibrillation (AF) in a patient. According to one embodiment, a hand-held atrial fibrillation detection device acquires an electrocardiogram (ECG) from the patient over a predetermined period of time. After acquiring the ECG from the patient, the device processes and analyzes the ECG and makes a determination of whether or not the patient has AF.
    Type: Grant
    Filed: April 29, 2014
    Date of Patent: May 12, 2015
    Inventors: Richard P Houben, Vincent C. Larik, Robert G. Tieleman
  • Patent number: 9026198
    Abstract: A method for determining the signal quality of samples in a physiological signal, in particular an electrocardiogram (ECG) signal, is provided. A supra-threshold sample sum, a noise threshold crossing sum, or both are calculated in a noise detection window including the sample to be evaluated, and low signal quality is indicated if either or both of the sums exceed respective values. ECG beat detections can then be labeled as unreliable based on the determination of low signal quality for one or more samples between the detections.
    Type: Grant
    Filed: June 8, 2011
    Date of Patent: May 5, 2015
    Assignee: Biotronik SE & Co. KG
    Inventors: Jie Lian, Dirk Muessig
  • Patent number: 9020584
    Abstract: A cardiac device and method for detecting QRS signals within a composite heart signal of a body including providing at least two input heart signals via at least two separate input channels, wherein each of the at least two input heart signals is recorded by pairs of sensing electrodes that have one electrode in common and provided coincidental in time. The cardiac device and method include generating estimated signals from the input heart signals, combining the input heart signals and the estimated signals to a combined input stream (SECG), and detecting the QRS signal by comparing the combined input stream (SECG) to an adaptive detection threshold (ATHR) which adapts throughout time.
    Type: Grant
    Filed: February 14, 2014
    Date of Patent: April 28, 2015
    Assignee: Biotronik SE & Co. KG
    Inventors: J. Christopher Moulder, Christopher S. de Voir, R. Hollis Whittington, Garth Garner
  • Publication number: 20150112218
    Abstract: A method for graphical representation of a train of ECG complexes having an R wave and a T-P interval and having variable isoelectric baselines. The method involves aligning the complexes in terms of signal amplitude by obtaining a baseline, thereby to provide a graphical representation of said train of ECG complexes; and aligning said complexes temporally using corresponding predetermined points.
    Type: Application
    Filed: December 28, 2014
    Publication date: April 23, 2015
    Inventors: Benjamin SHANI, Shai REVZEN, Aaron FRIMERMAN
  • Patent number: 9014794
    Abstract: A method for detecting an R-wave from an ECG signal derived from a living body, the ECG signal including a plurality of ECG channel signals, the method comprising the steps of providing a plurality of channel R-wave detectors each processing a distinct signal of the plurality of channel ECG signals to generate a distinct channel trigger signal of a plurality of channel trigger signals, and inputting each channel trigger signal into a composite R-wave detector to generate a composite R-wave trigger, whereby the composite R-wave detector more accurately detects R-waves than each of the plurality of channel R-wave detectors.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: April 21, 2015
    Assignee: APN Health, LLC
    Inventors: Donald Brodnick, David G. Jansson
  • Publication number: 20150105681
    Abstract: An active implantable medical device (e.g., implantable pacemaker or defibrillator), for detection of QRS complexes in noisy signals. Functional units (12-16) collect, amplify, prefilter and convert from analog-to-digital an endocardial signal, and digital functional units (18) provide signal processing and analysis of the digitized signal, for delivery of an indicator corresponding to a signal peak detection representative of the presence of a QRS complex in the endocardial signal. A double threshold comparator (30) is employed, receiving as input (28) the digitized signal and outputting (40) the indicator of peak detection when, cumulatively: the amplitude (A) of the input signal exceeds a peak amplitude threshold (SA), and the peak amplitude threshold is exceeded for a period (W) greater than a peak width threshold (SW). The peak amplitude threshold (SA) is a variable adaptive threshold, according to a noise level calculated from the energy (RMS) of the input signal.
    Type: Application
    Filed: October 20, 2014
    Publication date: April 16, 2015
    Applicant: SORIN CRM SAS
    Inventors: José Bonan, Christophe Harmel
  • Patent number: 9002453
    Abstract: Described herein are implantable systems and devices, and methods for use therewith, that can be used to perform arrhythmia discrimination. A plurality of different sensing vectors are used to obtain a plurality of different IEGMs, each of which is indicative of cardiac electrical activity at a different ventricular region. The plurality of different IEGMs can include, e.g., an IEGM indicative of cardiac electrical activity at a first region of the patient's left ventricular (LV) chamber and an IEGM indicative of cardiac electrical activity at a second region of the patient's LV chamber. Additionally, the plurality of different IEGMs can further include an IEGM indicative of cardiac electrical activity at a region of a patient's right ventricular (RV) chamber. For each of the IEGMs, there is a determination of a corresponding localized R-R interval stability metric indicative of the R-R interval stability at the corresponding ventricular region. This can include, e.g.
    Type: Grant
    Filed: July 29, 2011
    Date of Patent: April 7, 2015
    Assignee: Pacesetter, Inc.
    Inventors: Allen J. Keel, Kyungmoo Ryu, Stuart Rosenberg
  • Patent number: 8983586
    Abstract: A medical device and associated method for classifying an unknown cardiac signal that includes sensing a cardiac signal over a plurality of cardiac cycles, determining a template of a known cardiac signal in response to the cardiac signal sensed over the plurality of cardiac cycles, sensing an unknown cardiac signal over an unknown cardiac cycle, determining a fourth order difference signal, determining a template alignment point and an unknown cardiac signal alignment point in response to the fourth order difference signal; determining an R-wave onset and an R-wave offset in response to the fourth order difference signal of the unknown cardiac cycle signal, determining an R-wave width as the difference between the R-wave onset and the R-wave offset, determining a morphology analysis window in response to the R-wave width, and determining a first morphology match metric across the morphology analysis window.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: March 17, 2015
    Assignee: Medtronic, Inc.
    Inventor: Xusheng Zhang
  • Publication number: 20150045683
    Abstract: An electrocardiography signal extraction method includes receiving an electrocardiography signal, detecting a peak of a wave of the electrocardiography signal, separating the wave into left and right waves, normalizing the left wave and a plurality of scales of Gaussian, comparing the normalized left wave with a left part of the normalized scales of Gaussian, acquiring a left part error function, indicating a left minimum comparative error, selecting a left scale of Gaussian with the left minimum comparative error, obtaining a left duration of the wave, normalizing the right wave, comparing the normalized right wave with a right part of the normalized scales of Gaussian, acquiring a right part error function, indicating a right minimum comparative error, selecting a right scale of Gaussian with the right minimum comparative error, obtaining a right duration of the wave, and obtaining an extracted wave.
    Type: Application
    Filed: September 10, 2013
    Publication date: February 12, 2015
    Applicant: NATIONAL CHENG KUNG UNIVERSITY
    Inventors: Gwo Giun LEE, Jhen-Yue HU, Chun-Fu CHEN, Jhu-Syuan HO
  • Patent number: 8954140
    Abstract: 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: Grant
    Filed: September 25, 2013
    Date of Patent: February 10, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sabarimalai Manikandan Mottaiyan, Saurabh Tyagi
  • Patent number: 8942795
    Abstract: An implantable cardioverter defibrillator (ICD) senses ventricular depolarizations (R-waves) in an electrogram signal to detect a ventricular tachycardia or fibrillation episodes. The EGM signal is also monitored in real time for characteristics that uniquely identify instances of T-wave oversensing. The ICD determines whether detection of a tachycardia or fibrillation episode is appropriate based upon counts of each of the unique characteristics evidencing T-wave oversensing.
    Type: Grant
    Filed: March 31, 2005
    Date of Patent: January 27, 2015
    Assignee: Medtronic, Inc.
    Inventors: Bruce D. Gunderson, Amisha S. Patel, Chad A. Bounds
  • Publication number: 20150025403
    Abstract: In a mood analysis method using an electrocardiogram of a user, RR intervals in the electrocardiogram are computed, and low-frequency (LF) values and high-frequency (HF) values are also computed according to the RR intervals. Standard values of sympathetic nervous system (SNS) activity and parasympathetic nervous system (PSNS) activity are acquired corresponding to age and sex data of the user, to establish a mood display coordinate system. Coordinates of the LF values and the HF values in the mood display coordinate system are computed to determine a mood of the user.
    Type: Application
    Filed: April 15, 2014
    Publication date: January 22, 2015
    Applicants: YONGLIN BIOTECH CORP., CHIUN MAI COMMUNICATION SYSTEMS, INC.
    Inventors: MING-SHIUNG CHANG, HSUN-KO CHAN, DANIEL M. WENG, SHU-CHEN CHUANG, TUAN-CHUN CHEN, PEI-CHI HO, HSIANG-I KAO, SHING-HUEI LIN
  • Publication number: 20150018701
    Abstract: An integrated catheter placement system for accurately placing a catheter within a patient's vasculature is disclosed. In one embodiment, the integrated system comprises a system console, a tip location sensor for temporary placement on the patient's chest, and an ultrasound probe. The tip location sensor senses a magnetic field of a stylet disposed in a lumen of the catheter when the catheter is disposed in the vasculature. The ultrasound probe ultrasonically images a portion of the vasculature prior to introduction of the catheter. ECG signal-based catheter tip guidance is included in the integrated system to enable guidance of the catheter tip to a desired position with respect to a node of the patient's heart. Various aspects for visualizing and manipulating display of the ECG signal data acquired via the present system, together with aspects of various ECG sensor configurations, are also disclosed.
    Type: Application
    Filed: September 26, 2014
    Publication date: January 15, 2015
    Inventors: Jeremy B. Cox, Christian W. Crook, Anthony K. Misener, Paul D. Morgan, Daniel R. Morris
  • Patent number: 8934964
    Abstract: A method for graphical representation of a train of ECG complexes having an R wave and a T-P interval and having variable isoelectric baselines. The method involves aligning the complexes in terms of signal amplitude by obtaining a baseline, thereby to provide a graphical representation of said train of ECG complexes; and aligning said complexes temporally using corresponding predetermined points.
    Type: Grant
    Filed: November 24, 2013
    Date of Patent: January 13, 2015
    Assignee: Bio Signal Analysis Ltd.
    Inventors: Benjamin Shani, Shai Revzen, Aaron Frimerman
  • Publication number: 20150005654
    Abstract: A method for detecting heart beats within a cardiac signal is disclosed. A cardiac signal is acquired and segmented. Peak detection is performed within each segment. A search within the detected peaks is performed to locate physiologically permissible peak sequences. A particular peak sequence is selected based on feature space criteria or interpeak temporal regularity criteria or both.
    Type: Application
    Filed: June 5, 2014
    Publication date: January 1, 2015
    Inventor: Bruce Hopenfeld
  • Publication number: 20150005655
    Abstract: This biological information processing device is provided with: a peak detection unit for detecting the peaks of a biological signal generated in a cardiac cycle; a waveform clipping unit for clipping out a first peak-to-peak biological signal between two peaks, which are adjacent on the time axis of the biological signal, on the basis of detection results of the peak detection unit; and a resampling unit for transforming the first peak-to-peak biological signal to a second peak-to-peak biological signal for a prescribed number of samples. The biological information processing device is further provided with: an orthogonal transformation unit for generating orthogonal transformation coefficients by performing an orthogonal transformation on the second peak-to-peak biological signal; a differential processing unit for generating a differential signal for the orthogonal transformation coefficients on the time axis; and an encoding unit for encoding the differential signal.
    Type: Application
    Filed: December 19, 2012
    Publication date: January 1, 2015
    Inventor: Yasushi Sato
  • Patent number: 8909332
    Abstract: A method estimates morphological features of heart beats from an ECG signal. Peaks of the R wave of the ECG are detected and classified using a parallel filtering structure. The first branch implements a bandpass filtering with cut off frequencies of about 10 Hz and 35 Hz, enhancing the signal-to-noise ratio (SNR) of the QRS complex. The second branch estimates morphological features of the heart beat from an alternating current (AC) replica of the ECG signal, that may be used to classify the beat and potentially detect arrhythmias.
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: December 9, 2014
    Assignee: STMicroelectronics S.r.l.
    Inventors: Andrea Lorenzo Vitali, Marco Pessione
  • Publication number: 20140350423
    Abstract: Methods and devices for addressing difficulty with cardiac event sensing that can arise if the starting point of the cardiac cycle is not well aligned to the intended starting point of a detection profile used for sensing. As an improvement, illustrative methods and devices provide an addition to cardiac sensing operations by adjusting the starting point of a detection profile to align with a desired point in the cardiac signal.
    Type: Application
    Filed: May 21, 2013
    Publication date: November 27, 2014
    Applicant: Cameron Health, Inc.
    Inventors: Rick Sanghera, Venugopal Allavatam, Mark Schroeder
  • Publication number: 20140336522
    Abstract: A handheld terminal includes an electrocardiographic-signal dividing module that divides a biosignal into waveforms of a fixed interval, an R-R interval calculating module that calculates a plurality of R-R intervals indicative of an interval between adjacent R-waves and calculates an average value of the calculated R-R intervals for each of the waveforms of the fixed interval divided, and a candidate-waveform selecting module that selects a plurality of waveforms of a fixed interval corresponding to average values indicating near a maximum value of frequency of average values using the average value of the R-R intervals calculated for each of the waveforms of the fixed interval calculated, and thus highly accurate representative waveform data can be generated.
    Type: Application
    Filed: July 28, 2014
    Publication date: November 13, 2014
    Inventors: Yasuyuki NAKATA, Akihiro INOMATA
  • Patent number: 8886312
    Abstract: A system comprises a cardiac signal sensing circuit and a processor circuit. The cardiac signal sensing circuit is configured to sense a cardiac signal segment using a set of electrodes connectable to the cardiac signal sensing circuit. The processor circuit is communicatively coupled to the cardiac signal sensing circuit and includes a peak detector circuit. The peak detector circuit is configured to identify, in the cardiac signal segment, a fiducial indicative of ventricular activation that is local to at least one electrode of the first set of electrodes. The fiducial includes a first large positive or negative peak greater than a specified percentage of a maximum peak of the first cardiac signal segment. The processor circuit is configured to provide an indication of local ventricular activation to at least one of a user or process.
    Type: Grant
    Filed: July 5, 2012
    Date of Patent: November 11, 2014
    Assignee: Cardiac Pacemakers, Inc.
    Inventors: Yinghong Yu, Shibaji Shome, Dan Li, Michael Gold, Jagmeet Singh
  • Patent number: 8874237
    Abstract: A delivery catheter, including a catheter body, a side port, a first electrode, and a second electrode, is described. The catheter body may comprise a proximal end, a distal end, and a perimeter surface. The catheter body defines a delivery lumen extending longitudinally within the catheter body. The side port is defined in the perimeter surface of the catheter body proximate the distal end and in communication with the delivery lumen. The electrodes may be adjacent to and spaced from the side port. Techniques for using the delivery catheter to identify a desired lead implantation location, e.g., via the electrodes, and implant a medical lead or other implantable element at the desired location through the delivery lumen and side port are also described.
    Type: Grant
    Filed: April 16, 2008
    Date of Patent: October 28, 2014
    Assignee: Medtronic, Inc.
    Inventor: Richard John Schilling
  • Patent number: 8868170
    Abstract: An active implantable medical device (e.g., implantable pacemaker or defibrillator), for detection of QRS complexes in noisy signals. Functional units (12-16) collect, amplify, prefilter and convert from analog-to-digital an endocardial signal, and digital functional units (18) provide signal processing and analysis of the digitized signal, for delivery of an indicator corresponding to a signal peak detection representative of the presence of a QRS complex in the endocardial signal. A double threshold comparator (30) is employed, receiving as input (28) the digitized signal and outputting (40) the indicator of peak detection when, cumulatively: the amplitude (A) of the input signal exceeds a peak amplitude threshold (SA), and the peak amplitude threshold is exceeded for a period (W) greater than a peak width threshold (SW). The peak amplitude threshold (SA) is a variable adaptive threshold, according to a noise level calculated from the energy (RMS) of the input signal.
    Type: Grant
    Filed: April 16, 2012
    Date of Patent: October 21, 2014
    Assignee: Sorin CRM S.A.S.
    Inventors: José Bonan, Christophe Harmel
  • Patent number: 8862216
    Abstract: 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: Grant
    Filed: February 6, 2013
    Date of Patent: October 14, 2014
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventor: Hongxuan Zhang
  • Patent number: 8849387
    Abstract: A monitor of a physiological parameter of subject under test to which the monitor is attached, in operation. The monitor includes a set of accelerometers operating in different ranges of acceleration and a physiological sensor. The physiological sensor may include an ECG circuit producing an output data characterizing the subject as a function of a degree of motion and/or reorientation of the monitor or an oximeter device. The process of monitoring includes a determination of R-wave of the subject.
    Type: Grant
    Filed: May 30, 2013
    Date of Patent: September 30, 2014
    Assignee: Mayo Foundation for Medical Education and Research
    Inventors: Barry Gilbert, Clifton Haider, Christopher Felton, Daniel Schwab
  • Patent number: 8849388
    Abstract: 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: Grant
    Filed: September 7, 2012
    Date of Patent: September 30, 2014
    Assignee: Apn Health, LLC
    Inventors: Donald Brodnick, David G. Jansson
  • Publication number: 20140276112
    Abstract: A method and a system for determining changes in a body state of an individual including receiving a signal from a monitoring system, where the signal indicates a measurement of cardiac activity of the individual over a period of time and determining at least one signal feature, where the signal feature is a reoccurring event of the signal over the period of time. The method also includes determining a first interval between two successive signal features and determining a second interval between two successive first intervals. A derivative is calculated based on the second interval. Changes in the body state are identified based on the derivative.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: Honda Motor Co., Ltd.
    Inventors: Kin C. Fung, Timothy J. Dick, Charles William Hall, JR.
  • Publication number: 20140276140
    Abstract: Embodiments of the present disclosure are configured to collect multi-modality medical data from a patient. In some embodiments, a method includes acquiring heartbeat data from the patient using a heart-monitoring device, the heartbeat data identifying a first cardiac cycle of the patient and selecting a diagnostic window within the first cardiac cycle of the patient, wherein the diagnostic window encompasses only a portion of the first cardiac cycle of the patient. The method also includes acquiring first medical data from the patient during the diagnostic window using a first medical device, the first medical data being associated with a first medical modality and acquiring second medical data from the patient during the diagnostic window using a second medical device, the second medical data being associated with a second medical modality different than the first medical modality.
    Type: Application
    Filed: March 13, 2014
    Publication date: September 18, 2014
    Applicant: Volcano Corporation
    Inventor: Curtis Kinghorn
  • Publication number: 20140276156
    Abstract: Disclosed herein is a framework for facilitating patient signal analysis. In accordance with one aspect, at least one region of interest within a cycle of a waveform of patient signal data is identified. The identified region of interest may be segmented into portions using amplitude percentage categories. A sequential morphological data series may be generated by compiling time intervals of the segmented portions. One or more sequential signal parameters may be calculated based on the sequential morphological data series. A report may then be generated based at least in part on the one or more sequential signal parameters.
    Type: Application
    Filed: February 26, 2014
    Publication date: September 18, 2014
    Applicant: Siemens Medical Solutions USA, Inc.
    Inventor: Hongxuan Zhang
  • Patent number: 8831713
    Abstract: In general, this disclosure is directed to signal processing based methods to reject undersensing in a signal indicative of cardiac activity, e.g., ECG. The undersensing may be due to very small signal amplitudes or due to a sudden increase in single peak amplitude resulting in an increased sensing threshold. The undersensing may result in falsely detecting a cardiac event, e.g., asystole or bradycardia. The techniques of this disclosure monitor the behavior of the signal to determine when a detected asystole is false.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: September 9, 2014
    Assignee: Medtronic, Inc.
    Inventors: Robert W. Stadler, Tim Dirk Jan Jongen, Richard PM Houben