Patents by Inventor Hidekatsu Inukai
Hidekatsu Inukai 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: 7566307Abstract: A blood pressure monitoring apparatus which continuously estimates and monitors the blood pressure by using the pulse wave propagation time can accurately estimate the blood pressure. While an estimated blood pressure is continuously calculated by using the pulse wave propagation time, the correlation between the pulse wave propagation time and the interval between feature points contained in two consecutive heart beat waveforms of an electrocardiogram is monitored. If the correlation is reversed, the blood pressure is actually measured, and the estimated blood pressure is corrected on the basis of the difference between the estimated blood pressure and actually measured blood pressure.Type: GrantFiled: September 20, 2006Date of Patent: July 28, 2009Assignee: Fukuda Denshi Co., Ltd.Inventors: Hidekatsu Inukai, Toru Oka
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Patent number: 7393327Abstract: In blood pressure monitoring apparatus which continuously estimates and monitors blood pressure by using the pulse wave propagation time, blood pressure fluctuation can be accurately estimated. If both blood pressure estimated from the pulse wave propagation time and a waveform parameter obtained from the accelerated pulse wave have abnormal values, it is determined that the blood pressure is truly fluctuating, and blood pressure measurement by another method, e.g., blood pressure measurement using a cuff is performed.Type: GrantFiled: June 28, 2006Date of Patent: July 1, 2008Assignee: Fukuda Denshi Co., Ltd.Inventors: Hidekatsu Inukai, Toru Oka
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Patent number: 7390300Abstract: A pulse wave is detected in a predetermined location of a living body, and the progressive wave component and reflected wave component are extracted from the pulse wave. The pulse wave propagation time is calculated from the progressive wave component and reflected wave component, and blood pressure is calculated on the basis of this pulse wave propagation time. The use of this method provides blood pressure measuring apparatus capable of continuously measuring blood pressure with a simple method.Type: GrantFiled: June 28, 2006Date of Patent: June 24, 2008Assignee: Fukuda Denshi Co., Ltd.Inventors: Hidekatsu Inukai, Toru Oka
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Publication number: 20070066910Abstract: A blood pressure monitoring apparatus which continuously estimates and monitors the blood pressure by using the pulse wave propagation time can accurately estimate the blood pressure. While an estimated blood pressure is continuously calculated by using the pulse wave propagation time, the correlation between the pulse wave propagation time and the interval between feature points contained in two consecutive heart beat waveforms of an electrocardiogram is monitored. If the correlation is reversed, the blood pressure is actually measured, and the estimated blood pressure is corrected on the basis of the difference between the estimated blood pressure and actually measured blood pressure.Type: ApplicationFiled: September 20, 2006Publication date: March 22, 2007Inventors: Hidekatsu Inukai, Toru Oka
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Publication number: 20070016086Abstract: In blood pressure monitoring apparatus which continuously estimates and monitors blood pressure by using the pulse wave propagation time, blood pressure fluctuation can be accurately estimated. If both blood pressure estimated from the pulse wave propagation time and a waveform parameter obtained from the accelerated pulse wave have abnormal values, it is determined that the blood pressure is truly fluctuating, and blood pressure measurement by another method, e.g., blood pressure measurement using a cuff is performed.Type: ApplicationFiled: June 28, 2006Publication date: January 18, 2007Inventors: Hidekatsu Inukai, Toru Oka
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Publication number: 20070016085Abstract: A pulse wave is detected in a predetermined location of a living body, and the progressive wave component and reflected wave component are extracted from the pulse wave. The pulse wave propagation time is calculated from the progressive wave component and reflected wave component, and blood pressure is calculated on the basis of this pulse wave propagation time. The use of this method provides blood pressure measuring apparatus capable of continuously measuring blood pressure with a simple method.Type: ApplicationFiled: June 28, 2006Publication date: January 18, 2007Inventors: Hidekatsu Inukai, Toru Oka
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Patent number: 6645155Abstract: A blood pressure monitor apparatus for monitoring a blood pressure of a living subject, comprising: pulse-wave-propagation-velocity-relating information obtaining means for successively obtaining pulse-wave-propagation-velocity-relating information which relates to a pulse-wave propagation velocity at which a pulse wave propagates in an artery of the subject; pulse-period-relating information obtaining means for successively obtaining pulse-period-relating information which relates to a pulse period of the subject; peripheral-blood-volume-relating information obtaining means for successively obtaining peripheral-blood-volume-relating information which relates to a volume of blood which flows in a peripheral body portion of the subject; and abnormality judging means for judging that the blood pressure of the subject is abnormal when at least one of the pulse-wave-propagation-velocity-relating information, pulse-period-relating information, and peripheral-blood-volume-relating information does not fall within aType: GrantFiled: May 8, 2002Date of Patent: November 11, 2003Assignee: Colin CorporationInventors: Hidekatsu Inukai, Keizoh Kawaguchi, Tomohiro Nunome, Akihiro Yokozeki
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Patent number: 6547742Abstract: An apparatus for measuring a propagation velocity of a pulse wave which is propagated through an artery of a living subject, the apparatus including an electrocardiographic-waveform detecting device which detects an electrocardiographic waveform from the subject, a pulse-wave sensor which is adapted to be worn on the subject and which detects the pulse wave from the subject, a time-difference determining device for determining a time difference between a first periodic point relating to the detected electrocardiographic waveform and a second periodic point relating to the detected pulse wave, and a propagation-velocity determining means for determining the propagation velocity of the pulse wave based on the determined time difference.Type: GrantFiled: January 15, 2002Date of Patent: April 15, 2003Assignee: Colin CorporationInventors: Tohru Oka, Hiroshi Sakai, Hidekatsu Inukai, Toshihiko Ogura, Tomoko Ikawa, Takashi Nomura
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Patent number: 6527725Abstract: An apparatus for estimating a blood pressure of a living subject, including a measuring device which iteratively measures a blood pressure of the subject, a first device for obtaining first information relating to velocity of propagation of pulse wave, a second device for obtaining at least one of second information relating to heart rate and third information relating to area defined by volume pulse wave, a memory which stores groups of information each group of which includes the blood pressure, the first information, and at least one of the second information and the third information, a determining device for determining an expression representing a relationship between (A) blood pressure, and (B1) first information and (B2) at least one of (B21) second information and (B22) third information, and having a first coefficient for the first information, at least one second coefficient for at least one of the second and third information, and a constant, the determining device determining the coefficients andType: GrantFiled: January 25, 2001Date of Patent: March 4, 2003Assignee: Colin CorporationInventors: Hidekatsu Inukai, Akihiro Yokozeki, Keizoh Kawaguchi, Kiyoyuki Narimatsu
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Patent number: 6500127Abstract: A blood pressure monitor apparatus for monitoring a blood pressure of a living subject, comprising: blood pressure-relating information obtaining means for successively obtaining blood pressure-relating information which decreases or increases with a decrease or an increase of the blood pressure of the subject, or blood pressure-relating information which increases or decreases with a decrease or an increase of the blood pressure of the subject; decrease or increase determining means for determining a decrease or an increase of the blood pressure-relating information successively obtained by the obtaining means; and abnormality judging means for judging that the blood pressure of the subject is abnormal when the decrease or increase of the blood pressure-relating information is greater than a predetermined reference value (&ggr;1, &ggr;2), or abnormality judging means for judging that the blood pressure of the subject is abnormal when the blood pressure-relating information is greater than a predetermined refType: GrantFiled: May 11, 2000Date of Patent: December 31, 2002Assignee: Colin CorporationInventors: Hidekatsu Inukai, Keizoh Kawaguchi, Akihiro Yokozeki
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Publication number: 20020193692Abstract: A blood pressure monitor apparatus for monitoring a blood pressure of a living subject, comprising: pulse-wave-propagation-velocity-relating information obtaining means for successively obtaining pulse-wave-propagation-velocity-relating information which relates to a pulse-wave propagation velocity at which a pulse wave propagates in an artery of the subject; pulse-period-relating information obtaining means for successively obtaining pulse-period-relating information which relates to a pulse period of the subject; peripheral-blood-volume-relating information obtaining means for successively obtaining peripheral-blood-volume-relating information which relates to a volume of blood which flows in a peripheral body portion of the subject; and abnormality judging means for judging that the blood pressure of the subject is abnormal when at least one of the pulse-wave-propagation-velocity-relating information, pulse-period-relating information, and peripheral-blood-volume-relating information does not fall within aType: ApplicationFiled: May 8, 2002Publication date: December 19, 2002Applicant: Colin CorporationInventors: Hidekatsu Inukai, Keizoh Kawaguchi, Tomohiro Nunome, Akihiro Yokozeki
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Patent number: 6428481Abstract: A device for monitoring the blood pressure of a living subject, including a pulse-wave-propagation-velocity-relating information obtaining device for successively obtaining pulse-wave-propagation-velocity-relating information which relates to a pulse-wave propagation velocity at which a pulse wave propagates in an artery of the subject, a pulse-period-relating information obtaining device for successively obtaining pulse-period-relating information which relates to a pulse period of the subject, a peripheral-blood-volume-relating information obtaining device for successively obtaining peripheral-blood-volume-relating information which relates to a volume of blood which flows in a peripheral body portion of the subject, and an abnormality judging device for judging that the blood pressure of the subject is abnormal when at least one of the pulse-wave-propagation-velocity-relating information, pulse-period-relating information, and peripheral-blood-volume-relating information does not fall within a correspondinType: GrantFiled: May 30, 2000Date of Patent: August 6, 2002Assignee: Colin CorporationInventors: Hidekatsu Inukai, Keizoh Kawaguchi, Tomohiro Nunome, Akihiro Yokozeki
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Publication number: 20020087087Abstract: An apparatus for measuring a propagation velocity of a pulse wave which is propagated through an artery of a living subject, the apparatus including an electrocardiographic-waveform detecting device which detects an electrocardiographic waveform from the subject, a pulse-wave sensor which is adapted to be worn on the subject and which detects the pulse wave from the subject, a time-difference determining device for determining a time difference between a first periodic point relating to the detected electrocardiographic waveform and a second periodic point relating to the detected pulse wave, and a propagation-velocity determining means for determining the propagation velocity of the pulse wave based on the determined time difference.Type: ApplicationFiled: January 15, 2002Publication date: July 4, 2002Applicant: COLIN CORPORATIONInventors: Tohru Oka, Hiroshi Sakai, Hidekatsu Inukai, Toshihiko Ogura, Tomoko Ikawa, Takashi Nomura
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Patent number: 6406434Abstract: An apparatus for iteratively measuring a blood pressure of a living subject who is undergoing a blood-dialysis treatment, including an inflatable cuff which applies a pressing force to a body portion of the subject, a blood-pressure measuring device which measures a blood pressure of the subject by changing the pressing force of the cuff, a starting device for starting the blood-pressure measuring device at a predetermined period in the dialysis duration, so that the blood-pressure measuring device iteratively measures a blood pressure of the subject at the predetermined period, a period memory device which stores, for a plurality of living subjects including the subject, a plurality of sets of predetermined periods each set of which includes respective predetermined periods for a plurality of partial durations of the dialysis duration, an identifying device for identifying the subject, and a selecting device for selecting, from the sets of predetermined periods stored in the period memory device.Type: GrantFiled: December 28, 2000Date of Patent: June 18, 2002Assignee: Colin CorporationInventors: Hidekatsu Inukai, Tohru Oka
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Patent number: 6368282Abstract: An apparatus for measuring a propagation velocity of a pulse wave which is propagated through an artery of a living subject, the apparatus including an electrocardiographic-waveform detecting device which detects an electrocardiographic waveform from the subject, a pulse-wave sensor which is adapted to be worn on the subject and which detects the pulse wave from the subject, a time-difference determining device for determining a time difference between a first periodic point relating to the detected electrocardiographic waveform and a second periodic point relating to the detected pulse wave, and a propagation-velocity determining means for determining the propagation velocity of the pulse wave based on the determined time difference.Type: GrantFiled: December 30, 1999Date of Patent: April 9, 2002Assignee: Colin CorporationInventors: Tohru Oka, Hiroshi Sakai, Hidekatsu Inukai, Toshihiko Ogura, Tomoko Ikawa, Takashi Nomura
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Patent number: 6322516Abstract: A blood-pressure monitor, including a blood-pressure measuring device including a cuff, an information obtaining device which iteratively obtains, from a living subject, physical information which changes with change of blood pressure of the subject, a measurement starting device for starting a measurement of the blood-pressure measuring device, when a subsequent piece of information obtained by the obtaining device after the measuring device has measured a last blood pressure of the subject in a last measurement thereof has been deviated by not less than a predetermined amount from an initial piece of information obtained by the obtaining device when the measuring device measured the last blood pressure of the subject, a display device which displays a graph representing the pieces of information obtained by the obtaining device, and a control device which controls the display device to display the graph representing the initial piece of information and each one of subsequent pieces of information iterativelType: GrantFiled: October 27, 2000Date of Patent: November 27, 2001Assignee: Colin CorporationInventors: Hiroshi Masuda, Akihiro Yokozeki, Hidekatsu Inukai, Yoshihisa Miwa
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Publication number: 20010012917Abstract: An apparatus for iteratively measuring a blood pressure of a living subject who is undergoing a blood-dialysis treatment, including an inflatable cuff which applies a pressing force to a body portion of the subject, a blood-pressure measuring device which measures a blood pressure of the subject by changing the pressing force of the cuff, a starting device for starting the blood-pressure measuring device at a predetermined period in the dialysis duration, so that the blood-pressure measuring device iteratively measures a blood pressure of the subject at the predetermined period, a period memory device which stores, for a plurality of living subjects including the subject, a plurality of sets of predetermined periods each set of which includes respective predetermined periods for a plurality of partial durations of the dialysis duration, an identifying device for identifying the subject, and a selecting device for selecting, from the sets of predetermined periods stored in the period memory device, the set ofType: ApplicationFiled: December 28, 2000Publication date: August 9, 2001Inventors: Hidekatsu Inukai, Tohru Oka
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Patent number: 6120456Abstract: An apparatus for measuring a propagation velocity of a pulse wave which is propagated through an artery of a living subject, the apparatus including an electrocardiographic-waveform detecting device which detects an electrocardiographic waveform from the subject, a pulse-wave sensor which is adapted to be worn on the subject and which detects the pulse wave from the subject, a time-difference determining device for determining a time difference between a first periodic point relating to the detected electrocardiographic waveform and a second periodic point relating to the detected pulse wave, and a propagation-velocity determining means for determining the propagation velocity of the pulse wave based on the determined time difference.Type: GrantFiled: February 4, 1998Date of Patent: September 19, 2000Assignee: Colin CorporationInventors: Tohru Oka, Hiroshi Sakai, Hidekatsu Inukai, Toshihiko Ogura, Tomoko Ikawa, Takashi Nomura
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Patent number: 6036651Abstract: An apparatus for estimating an intraarterial blood pressure of a living subject, based on information non-invasively obtained from a circulatory organ of the subject, including: a first device for obtaining first information which relates to velocity of propagation of a pulse wave; a second device for obtaining at least one of second information which relates to heart rate and third information which relates to an area defined by a volume pulse wave; a third device for estimating, according to a predetermined relationship to between (A) blood pressure, and (B1) first information and (B2) at least one of (B21) second information and (B22) third information, the blood pressure, based on the first information and the at least one of the second information and the third information, the predetermined relationship being defined by a numerical expression including a plurality of predetermined coefficients; and a fourth device for selecting, from a plurality of groups of predetermined coefficients which correspond tType: GrantFiled: May 29, 1998Date of Patent: March 14, 2000Assignee: Colin CorporationInventors: Hidekatsu Inukai, Akihiro Yokozeki, Keizoh Kawaguchi
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Patent number: 6036652Abstract: An apparatus for successively estimating an intraarterial blood pressure of a living subject, based on information non-invasively obtained from a circulatory organ of the subject, including: a first device for non-invasively obtaining, from the circulatory organ of the subject, first information which relates to velocity of propagation of a pulse wave which propagates through an artery of the subject; a second device for non-invasively obtaining, from the circulatory organ of the subject, at least one of second information which relates to heart rate of the subject and third information which relates to an area defined by a volume pulse wave from a peripheral portion of the subject; and a third device for estimating, according to a predetermined relationship between (A) blood pressure, and (B1) first information and (B2) at least one of (B21) second information and (B22) third information, the intraarterial blood pressure of the subject, based on the first information obtained by the first device and the at lType: GrantFiled: May 29, 1998Date of Patent: March 14, 2000Assignee: Colin CorporationInventors: Hidekatsu Inukai, Akihiro Yokozeki, Keizoh Kawaguchi, Kiyoyuki Narimatsu