Patents by Inventor Toshikazu Yokokawa

Toshikazu Yokokawa 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).

  • Apparatus for measuring vascular viscoelasticity index
    Patent number: 8251910
    Abstract: The present invention is directed to provide an apparatus for measuring a vascular viscoelasticity index which is noninvasive, simple in structure and yet inexpensive. The present invention provides an apparatus for measuring a vascular viscoelasticity index, which measures a vascular viscoelasticity index ? by a formula ?={(Pb2?Pa2)?(Pb1?Pa1)}/(Va2?Va1) wherein Pb1 is the maximal value of the first pulse wave; Va1 is the local maximum value of a time derivative value of the first pulse wave; Pa1 is the pulse wave amplitude corresponding to the local maximum value Va1; Pb2 is the maximal value of the second pulse wave; Va2 is the local maximum value of a time derivative value of the second pulse wave; and Pa2 is the pulse wave amplitude corresponding to the local maximum value Va2.
    Type: Grant
    Filed: July 7, 2007
    Date of Patent: August 28, 2012
    Assignees: Shisei Datum Co., Ltd., National Institute of Advanced Industrial Science and Technology
    Inventors: Yukiyoshi Saito, Minoru Tokiwa, Toshikazu Yokokawa, Takashi Yokoi, Hidehiko Komine, Yoshiyuki Asai
  • APPARATUS FOR MEASURING VASCULAR VISCOELASTICITY INDEX
    Publication number: 20090306523
    Abstract: The present invention is directed to provide an apparatus for measuring a vascular viscoelasticity index which is noninvasive, simple in structure and yet inexpensive. The present invention provides an apparatus for measuring a vascular viscoelasticity index, which measures a vascular viscoelasticity index ? by a formula ?={(Pb2?Pa2)?(Pb1?Pa1)}/(Va2?Va1) wherein Pb1 is the maximal value of the first pulse wave; Va1 is the local maximum value of a time derivative value of the first pulse wave; Pa1 is the pulse wave amplitude corresponding to the local maximum value Va1; Pb2 is the maximal value of the second pulse wave; Va2 is the local maximum value of a time derivative value of the second pulse wave; and Pa2 is the pulse wave amplitude corresponding to the local maximum value Va2.
    Type: Application
    Filed: July 7, 2007
    Publication date: December 10, 2009
    Inventors: Yukiyoshi Saito, Minoru Tokiwa, Toshikazu Yokokawa, Takashi Yokoi, Hidehiko Komine, Yoshiyuki Asai