Patents by Inventor Chen-tai Xie

Chen-tai Xie 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 determining concentrations of light-absorbing materials in living tissue
    Patent number: 6230035
    Abstract: Irradiating device 3 of a pulse oximeter includes a scattering plate 6. Scattering light is projected into a living tissue. The diameter of the incident area is sufficiently large compared with that of a light receiving area or vice versa. Therefore, tissue terms in a theoretical formula of &PHgr; which represents a ratio of changes of optical densities of tissue measured with two wavelengths are not dependent on the wavelength. The digital processor 10 calculates an oxygen saturation by substituting &PHgr; measured into simultaneous equations.
    Type: Grant
    Filed: July 19, 1999
    Date of Patent: May 8, 2001
    Assignee: Nihon Kohden Corporation
    Inventors: Takuo Aoyagi, Masayoshi Fuse, Chen-tai Xie, Michio Kanemoto