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Takuo Aoyagi: Apparatus for measuring predetermined data of living tissue. Nihon Kohden Corporation, Sughrue Mion Zinn Macpeak & Seas, January 31, 1995: US05385143 (255 worldwide citation)

Disclosed is an apparatus for measuring a predetermined data of a living tissue, such as an oxygen saturation, a dye dilution curve and level of hemoglobin. The apparatus has an illumination intensity computing and storing circuit that stores the intensities of light components emitted from a three- ...


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Hiroko Miura, Noriaki Todokoro, Hideo Ozawa: Pulse oximeter probe. Nihon Kohden Corporation, Sughrue Mion Zinn Macpeak & Seas PLLC, November 28, 2000: US06154667 (217 worldwide citation)

A movable mechanism (3) moves a first housing (1) having a light emitting element (4) mounted thereon and a second housing (2) having a photo sensing element (5) mounted thereon in a state that those housings are parallel to each other. The movable mechanism (3) includes a pair of knobs (15A and 15B ...


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Iwao Takahashi: Method and apparatus for accurately measuring the saturated oxygen in arterial blood by substantially eliminating noise from the measurement signal. Nihon Kohden Corporation, Sughrue Mion Zinn Macpeak & Seas PLLC, November 30, 1999: US05995859 (213 worldwide citation)

A pulse oximeter includes a light-emitting device for repeating red light emission, infrared light emission, and no light emission with respect to an object to be measured every data sampling cycle in a measurement of a saturated oxygen in arterial blood, a light-receiving device for outputting a li ...


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Takuo Aoyagi, Masayoshi Fuse, Yoshiaki Shindo, Masayuki Kato: Apparatus for calibrating pulse oximeter. Nihon Kohden Corporation, Sughrue Mion Zinn Macpeak & Seas, January 11, 1994: US05278627 (182 worldwide citation)

An apparatus for calibrating a pulse oximeter which can improve the repetitivity of measured values for calibration tests and which can calibrate the pulse oximeter with a high reliability. A tissue model having a light-absorbing characteristic approximated to that of the tissue of a living body is ...


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Teiji Ukawa, Kazumasa Ito, Tadashi Nakayama: Pulse oximeter. Nihon Kohden Corporation, Sughrue Mion Zinn Macpeak & Seas, October 18, 1994: US05355882 (179 worldwide citation)

A improved pulse oximeter comprises first and second light-emitting diodes that apply red light and infrared light, respectively, to a living tissue including the arterial blood, a photodiode for detecting optical outputs as produced after the red and infrared light of two wavelengths issuing from l ...


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Teiji Ukawa, Sunao Takeda, Hideo Ozawa: Pulse oximeter with probe difference compensation. Nihon Kohden Corporation, Sughrue Mion Zinn Macpeak & Seas, December 7, 1993: US05267562 (174 worldwide citation)

A pulse oximeter of the present invention is to provide a greatly simplified in construction and a simplified procedure for performing arithmetic operations. The pulse oximeter of the present invention comprises a light-emitting diode which is provided in a probe and that illuminates a living tissue ...