Patents by Inventor Johannes Jan Struijk
Johannes Jan Struijk has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11617563Abstract: The present invention relates to a method and system for determining a central pulse wave velocity in a pregnant woman. The method comprises receiving an indication of a measurement of a length of a human aortic path outside the body to provide an aortic length, arranging a sound transducer at the position of the anatomical projection of the uterine artery, identifying the opening of the maternal aortic valve with measurement from the sound transducer as a first time, and the pulse wave arrival time at the uterine artery with measurements from the sound transducer as a second time, determining the central transit time based on the difference between the second time and the first time, and calculating the central pulse wave velocity based on the aortic length and the central transit time.Type: GrantFiled: June 7, 2017Date of Patent: April 4, 2023Assignee: VIEWCARE TECHNOLOGIES 1 APSInventors: Diana Kjær Thing Riknagel, Johannes Jan Struijk
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Patent number: 11406348Abstract: A method for assessment and/or monitoring a person's cardiovascular state comprises: using a sound and vibration transducer to acquire a vascular sound signal in order to detect a vascular sound from a cervical, thoracic, abdominal, pelvic, or lower limb region of the person; filtering the vascular sound signal to isolate the vascular sound, said filtering using a filter which attenuates frequencies below a lower cut-off frequency in a range of 100-300 Hz; and analyzing the filtered sound signal in order to determine whether an indication of a dicrotic notch in the vascular sound exceeds a set threshold.Type: GrantFiled: February 27, 2020Date of Patent: August 9, 2022Assignee: VIEWCARE TECHNOLOGIES 1 APSInventors: Diana Kjær Thing Riknagel, Johannes Jan Struijk, Henrik Zimmermann
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Patent number: 11160487Abstract: A method for analyzing a condition of a heart, comprises receiving a plurality of electric signals, which are acquired by non-invasive measurement on the skin of a person or animal, each signal representing electrical activity in a respective region of the heart of the person or animal; calculating a derivative value of each signal at a plurality of time instances; selecting a plurality of the calculated derivative values of a first signal and determining a first point in time of a first event based on the selected derivative values; selecting a plurality of the calculated derivative values of a second signal and determining a second point in time of a second event, corresponding to the first event, based on the selected derivative values of the second signal, and calculating at least one measure based on a difference of the first point in time and the second point in time.Type: GrantFiled: November 3, 2017Date of Patent: November 2, 2021Assignee: AALBORG UNIVERSITETInventors: Jacob Melgaard, Johannes Jan Struijk, Claus Graff
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Patent number: 10849567Abstract: A way of indicating a risk for coronary artery disease is disclosed. A first plurality of first sound recordings of heartbeats and second plurality of second sound recording of the ambient background are obtained. A filtering of each first sound recording is performed by using a simultaneously recorded second sound recording. The filtering of each first sound recording involves determining a diastolic period of the heartbeat of the first sound recording, and performing an adaptive filtering of the first sound recording based in the diastolic period of the first sound recording and the simultaneously recorded second sound recording. This is followed by determination of an indication of the risk for coronary artery disease based on the filtered first sound recordings.Type: GrantFiled: April 8, 2016Date of Patent: December 1, 2020Assignee: ACARIX ASInventors: Samuel Emil Schmidt, Johannes Jan Struijk
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Publication number: 20200253577Abstract: A method for assessment and/or monitoring a person's cardiovascular state comprises: using a sound and vibration transducer to acquire a vascular sound signal in order to detect a vascular sound from a cervical, thoracic, abdominal, pelvic, or lower limb region of the person; filtering the vascular sound signal to isolate the vascular sound, said filtering using a filter which attenuates frequencies below a lower cut-off frequency in a range of 100-300 Hz; and analyzing the filtered sound signal in order to determine whether an indication of a dicrotic notch in the vascular sound exceeds a set threshold.Type: ApplicationFiled: February 27, 2020Publication date: August 13, 2020Applicant: VIEWCARE TECHNOLOGIES 1 APSInventors: Diana KJÆR THING RIKNAGEL, Johannes Jan STRUIJK, Henrik ZIMMERMANN
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Patent number: 10575814Abstract: A method for assessment and/or monitoring a person's cardiovascular state comprises: using a sound and vibration transducer to acquire a vascular sound signal in order to detect a vascular sound from a cervical, thoracic, abdominal, pelvic, or lower limb region of the person; filtering the vascular sound signal to isolate the vascular sound, said filtering using a filter which attenuates frequencies below a lower cut-off frequency in a range of 100-300 Hz; and analyzing the filtered sound signal in order to determine whether an indication of a dicrotic notch in the vascular sound exceeds a set threshold.Type: GrantFiled: October 16, 2015Date of Patent: March 3, 2020Assignee: VIEWCARE TECHNOLOGIES 1 APSInventors: Diana KjÆr Thing Riknagel, Johannes Jan Struijk, Henrik Zimmermann
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Publication number: 20190336013Abstract: A quantifying of the function of a beating heart is disclosed, in which a signal is recorded with an accelerometer placed on the chest of a person. A plurality of segments of the signal are formed, which are aligned and filtered with a band-pass filter having a lower cutoff frequency below 1 Hz and an upper cut-off frequency in the range 100-250 Hz. A mean segment is then determined, in which a first temporal feature is determined. A measure is then determined based on at least one of the signal value, or amplitude, of the first temporal feature and the location in time of the first temporal feature. The determined measure is then provided as output information.Type: ApplicationFiled: June 16, 2017Publication date: November 7, 2019Inventors: Samuel Emil SCHMIDT, Peter SØGAARD, Johannes Jan STRUIJK
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Publication number: 20190254552Abstract: A method for analyzing a condition of a heart, comprises receiving a plurality of electric signals, which are acquired by non-invasive measurement on the skin of a person or animal, each signal representing electrical activity in a respective region of the heart of the person or animal; calculating a derivative value of each signal at a plurality of time instances; selecting a plurality of the calculated derivative values of a first signal and determining a first point in time of a first event based on the selected derivative values; selecting a plurality of the calculated derivative values of a second signal and determining a second point in time of a second event, corresponding to the first event, based on the selected derivative values of the second signal, and calculating at least one measure based on a difference of the first point in time and the second point in time.Type: ApplicationFiled: November 3, 2017Publication date: August 22, 2019Applicant: AALBORG UNIVERSITETInventors: Jacob MELGAARD, Johannes Jan STRUIJK, Claus GRAFF
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Publication number: 20190183454Abstract: The present invention relates to a method and system for determining a central pulse wave velocity in a pregnant woman. The method comprises receiving an indication of a measurement of a length of a human aortic path outside the body to provide an aortic length, arranging a sound transducer at the position of the anatomical projection of the uterine artery, identifying the opening of the maternal aortic valve with measurement from the sound transducer as a first time, and the pulse wave arrival time at the uterine artery with measurements from the sound transducer as a second time, determining the central transit time based on the difference between the second time and the first time, and calculating the central pulse wave velocity based on the aortic length and the central transit time.Type: ApplicationFiled: June 7, 2017Publication date: June 20, 2019Applicant: VIEWCARE TECHNOLOGIES 1 APSInventors: Diana KJÆR THING RIKNAGEL, Johannes Jan STRUIJK
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Publication number: 20190175072Abstract: A technology for quantifying, or determining an indication of, cardiorespiratory fitness is disclosed. A signal portion is obtained from a signal recorded with an accelerometer placed on the chest of a person. The accelerometer measures accelerations and vibrations of the chest wall of the person caused by myocardial movement. A maximum value is determined in the signal portion, and output information is provided indicating cardiorespiratory fitness based on the maximum value.Type: ApplicationFiled: June 16, 2017Publication date: June 13, 2019Inventors: Samuel Emil Schmidt, Kasper Sorensen, Peter Sogaard, Johannes Jan Struijk
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Patent number: 10278635Abstract: A system for monitoring a fetus in a pregnant woman, and/or the maternal health risk for pregnancies complicated by such as pre-eclampsia and hypertensive disorders is configured to be worn by the pregnant woman, preferably so as to allow monitoring during daily life, e.g. in the form of an adhesive patch. The unit has a sound sensor, e.g. a microphone or accelerometer, to be positioned on the skin of the abdominal area so as to detect a vascular sound from umbilical arteries of the fetus or from the uterine arteries of the pregnant woman. The sound sensor is functionally connected to a processing unit which executes a processing algorithm on the captured vascular sound and extracts a signal parameter accordingly. The processing unit then communicates the signal parameter, e.g. using an audio signal, a visual display or by means of a wired or a wireless data signal.Type: GrantFiled: November 30, 2012Date of Patent: May 7, 2019Assignee: Viewcare Technologies 1 ApSInventors: Birthe Irene Dinesen, Diana Kjær Thing Riknagel, Johannes Jan Struijk
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Publication number: 20180020987Abstract: A way of indicating a risk for coronary artery disease is disclosed. A first plurality of first sound recordings of heartbeats and second plurality of second sound recording of the ambient background are obtained. A filtering of each first sound recording is performed by using a simultaneously recorded second sound recording. The filtering of each first sound recording involves determining a diastolic period of the heartbeat of the first sound recording, and performing an adaptive filtering of the first sound recording based in the diastolic period of the first sound recording and the simultaneously recorded second sound recording. This is followed by determination of an indication of the risk for coronary artery disease based on the filtered first sound recordings.Type: ApplicationFiled: April 8, 2016Publication date: January 25, 2018Applicant: ACARIX ASInventors: Samuel Emil Schmidt, Johannes Jan Struijk
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Publication number: 20170258436Abstract: A method for assessment and/or monitoring a person's cardiovascular state comprises: using a sound and vibration transducer to acquire a vascular sound signal in order to detect a vascular sound from a cervical, thoracic, abdominal, pelvic, or lower limb region of the person; filtering the vascular sound signal to isolate the vascular sound, said filtering using a filter which attenuates frequencies below a lower cut-off frequency in a range of 100-300 Hz; and analyzing the filtered sound signal in order to determine whether an indication of a dicrotic notch in the vascular sound exceeds a set threshold.Type: ApplicationFiled: October 16, 2015Publication date: September 14, 2017Applicant: VIEWCARE TECHNOLOGIES 1 APSInventors: Diana KJÆR THING RIKNAGEL, Johannes Jan STRUIJK, Henrik ZIMMERMANN
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Patent number: 9451921Abstract: A system and method for diagnosing coronary artery disease (CAD) comprises an acoustic sensor to be placed on the chest of a patient to generate acoustic signals SA: a control unit adapted to receive said acoustic signals SA, the control unit comprising: an identification unit to identify diastolic or systolic periods in a predetermined time period and to generate a period signal SP; a filtering unit adapted to apply a filter to said identified periods to generate a low frequency band signal SLFB and a high frequency band signal SHFB of said identified periods; and a calculation unit, to calculate a low frequency power measure SLFP and a high frequency feature measure SHFF. A risk-determining unit provides a risk-of-CAD signal based on the low frequency power measure and the high frequency feature measure. The invention also relates to a stethoscope and a method for detection of low frequency power.Type: GrantFiled: May 1, 2015Date of Patent: September 27, 2016Assignee: Acarix A/SInventors: Samuel Emil Schmidt, Johannes Jan Struijk
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Publication number: 20150305687Abstract: A system and method for diagnosing coronary artery disease (CAD) comprises an acoustic sensor to be placed on the chest of a patient to generate acoustic signals SA: a control unit adapted to receive said acoustic signals SA, the control unit comprising: an identification unit to identify diastolic or systolic periods in a predetermined time period and to generate a period signal SP; a filtering unit adapted to apply a filter to said identified periods to generate a low frequency band signal SLFB and a high frequency band signal SHFB of said identified periods; and a calculation unit, to calculate a low frequency power measure SLFP and a high frequency feature measure SHFF. A risk-determining unit provides a risk-of-CAD signal based on the low frequency power measure and the high frequency feature measure. The invention also relates to a stethoscope and a method for detection of low frequency power.Type: ApplicationFiled: May 1, 2015Publication date: October 29, 2015Applicant: ACARIX A/SInventors: Samuel Emil Schmidt, Johannes Jan Struijk
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Patent number: 9125564Abstract: A system for detection of frequency power for diagnosing coronary artery disease (CAD), comprising: an acoustic sensor to be placed on the chest of a patient to generate acoustic signals SA: a memory adapted to store acoustic signals SA; a control unit adapted to receive said acoustic signals SA; the control unit comprising: an identification unit to identify diastolic or systolic periods in a predetermined time period and to generate a period signal SP, a filtering unit adapted to apply a filter to said identified periods to generate a low frequency band signal SLFB indicating low frequency bands of identified periods; a calculation unit to estimate the power in said low frequency band of identified periods, to calculate a low frequency power measure and to generate a low frequency power measure signal SLFP. The invention also relates to a stethoscope and a method for detection of low frequency power.Type: GrantFiled: December 13, 2011Date of Patent: September 8, 2015Assignee: Acarix A/SInventors: Samuel Emil Schmidt, Johannes Jan Struijk
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Publication number: 20150216483Abstract: A device and a method for analyzing an input signal (1) representing a neural activity of a nerve containing nerve fibers originating from baroreceptors from a patient. E.g. neural activity recorded with an electrode implanted to detect Vagus nerve activity. The invention is based on the insight that this neural activity can be used to determine a value indicative of the patient's blood pressure (BP). An ECG signal (2) can be used for deriving a trigger feature for processing of the nerve activity data, e.g. to arrive at a profile of the patient's Blood Pressure Pulse. E.g. the device can include a Vagus nerve stimulation unit which is controlled in response to an output from the calculation of blood pressure (BP), and/or features related to the Blood Pressure Pulse.Type: ApplicationFiled: September 19, 2013Publication date: August 6, 2015Inventors: Cristian Sevcencu, Johannes Jan Struijk, Thomas Nørgaard Nielsen, Kristian Rauhe Harreby
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Publication number: 20150018635Abstract: A system for monitoring a fetus in a pregnant woman, and/or the maternal health risk for pregnancies complicated by such as pre-eclampsia and hypertensive disorders is configured to be worn by the pregnant woman, preferably so as to allow monitoring during daily life, e.g. in the form of an adhesive patch. The unit has a sound sensor, e.g. a microphone or accelerometer, to be positioned on the skin of the abdominal area so as to detect a vascular sound from umbilical arteries of the fetus or from the uterine arteries of the pregnant woman. The sound sensor is functionally connected to a processing unit which executes a processing algorithm on the captured vascular sound and extracts a signal parameter accordingly. The processing unit then communicates the signal parameter, e.g. using an audio signal, a visual display or by means of a wired or a wireless data signal.Type: ApplicationFiled: November 30, 2012Publication date: January 15, 2015Applicant: AALBORG UNIVERSITETInventors: Birthe Irene Dinesen, Diana Kjær Thing Riknagel, Johannes Jan Struijk
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Patent number: 8684943Abstract: A method, system, stethoscope and server for classifying a cardiovascular sound recorded from a living subject. The method comprises the steps of: identifying diastolic and/or systolic segments of the cardiovascular sound; dividing at least one of the identified diastolic and/or systolic segments into a number of sub-segments comprising at least a first sub-segment and at least a second sub-segment; extracting from the first sub-segment at least a first signal parameter characterizing a first property of the cardiovascular sound, extracting from the second sub-segment at least a second signal parameter characterizing a second property of the cardiovascular sound; and classifying the cardiovascular sound using the at least first signal parameter and the at least second signal parameter in a multivariate classification method.Type: GrantFiled: June 26, 2007Date of Patent: April 1, 2014Assignee: Acarix A/SInventors: Samuel Emil Schmidt, Johannes Jan Struijk, Claus Graff
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Publication number: 20130261484Abstract: A system for detection of frequency power for diagnosing coronary artery disease (CAD), comprising: an acoustic sensor to be placed on the chest of a patient to generate acoustic signals SA: a memory adapted to store acoustic signals SA; a control unit adapted to receive said acoustic signals SA; the control unit comprising: an identification unit to identify diastolic or systolic periods in a predetermined time period and to generate a period signal SP, a filtering unit adapted to apply a filter to said identified periods to generate a low frequency band signal SLFB indicating low frequency bands of identified periods; a calculation unit to estimate the power in said low frequency band of identified periods, to calculate a low frequency power measure and to generate a low frequency power measure signal SLFP. The invention also relates to a stethoscope and a method for detection of low frequency power.Type: ApplicationFiled: December 13, 2011Publication date: October 3, 2013Inventors: Samuel Erik Schmidt, Johannes Jan Struijk