The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 23, 2001
Filed:
Aug. 27, 1998
Yoshiyuki Habu, Nakai-machi, JP;
Mitsutoshi Yaegashi, Nakai-machi, JP;
Terumo Kabushiki Kaisha, Tokyo, JP;
Abstract
It is an object of the present invention to provide a cardiovascular information measurement system capable of performing an accurate blood pressure measurement and calculating an accurate cardiovascular index in consideration of the pulsation of a blood vessel wall. To achieve this object, the cardiovascular information measurement system includes ultrasonic transducer groups (,) for simultaneously detecting sectional shapes (,) of two arterial portions, a cross-sectional area calculation unit (,) for calculating cross-sectional areas of the two arterial portions on the basis of the detected sectional shapes, a flow velocity calculation unit (,) for calculating an average blood flow velocity in an artery on the basis of the cross-sectional areas calculated by the cross-sectional area calculation unit (,), a pulse wave velocity calculation unit (,) for calculating a pulse wave propagation velocity between the two arterial portions in accordance with time changes in the detected sectional shapes of the two arterial portions, a relative blood pressure calculation unit (,) for calculating a relative blood pressure value to a reference blood pressure value obtained in a specific time phase, on the basis of the calculated blood flow velocity and the calculated pulse wave propagation velocity, and an absolute blood pressure calculation unit (,) for calculating an absolute blood pressure value on the basis of the relative blood pressure value and the reference blood pressure value obtained in the specific time phase and measured in advance.