# US 10,499,836 B2 · Oxygen saturation measuring sensor, and oxygen saturation measuring apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,499,836 B2 - Document ID: US10499836B2 - Status: Granted - Kind: B2 - Application number: 15/117,785 - Filed: 2016-04-11 - Published: 2018-04-26 - Granted: 2019-12-10 - Earliest claimed: 2016-04-11 - Assignees: Fujita Medical Instruments Co., Ltd. - Applicants: Fujita Medical Instruments Co., Ltd. - Inventors: Hironobu Maeda; Haruo Yamamura - Web page: https://patentgrep.com/patent/US10499836B2 ## CPC - A61B 5/14552: {Details of sensors specially adapted therefor} - A61B 5/1495: Calibrating or testing of in-vivo probes - A61B 5/6833: {Adhesive patches} - G01N 33/4925: {measuring blood gas content, e.g. O2, CO2 , HCO3} - A61B 2560/0238: Means for recording calibration data - A61B 2560/0412: Low-profile patch shaped housings - A61B 2562/0238: Optical sensor arrangements for performing transmission measurements on body tissue - A61B 2562/043: in a linear array - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) ## Abstract An oxygen saturation measuring sensor is capable of increasing reliability of information of parts having different depth and includes a pad attachable to a human body; plural light sources arranged on the pad to be adjacent in a separate state, and irradiate near-infrared light; plural light receiving elements arranged on the pad to be adjacent in a separate state and correspond one to one to the plural light sources with reference to a common center with an innermost side of the plural light sources, and that receive transmitted light from the corresponding plural light sources; and a ROM unit that stores a reference value through measuring transmitted light using a phantom in advance and stores a light receiving amount of the transmitted light received by the plural light receiving elements. ## Claims ### Claim 1 An oxygen saturation measuring sensor comprising: a pad attachable to a human body; a plurality of light sources comprising a light source A and a light source B arranged on the pad adjacent to and spaced apart from one another, and that irradiate near-infrared light; a plurality of light receiving elements comprising a light receiving element A and a light receiving element B arranged on the pad adjacent to and spaced apart from one another and correspond one to one to the plurality of light sources with reference to a common center between 1) the light sources A and B, and 2) the light receiving elements A and B, and that receive transmitted light from the corresponding plurality of light sources, wherein distances between 1) the light source A and the light source B, 2) the light source B and the light receiving element B, and 3) the light receiving element A and the light receiving element B are the same; and a ROM unit that stores a reference value through measuring transmitted light using a phantom in advance. ### Claim 2 (depends on 1) The oxygen saturation measuring sensor according to claim 1, wherein the pad includes a printed substrate having an attachment surface configured to be attached to the human body and a foamed rubber provided on a back surface side of the printed substrate, wherein a light source of the plurality of light sources and a light receiving element of the plurality of light receiving elements are arranged in a hole formed in the printed substrate such that a surface of the light source and a surface of the light receiving element have the same plane as the attachment surface. ### Claim 3 (depends on 1) The oxygen saturation measuring sensor according to claim 1, wherein sensor A comprises the light source A and light receiving element A and sensor B comprises the light source B and light receiving element B, and sensors A and B measure the information at different depths below the common center. ### Claim 4 (depends on 3) The oxygen saturation measuring sensor according to claim 3, wherein information at a depth measured by the sensor B is subtracted from information at a depth measured by the sensor A. ### Claim 5 (depends on 4) The oxygen saturation measuring sensor according to claim 4, wherein the sensors A and B each measure the information at their respective depths having a length of 70% to 80% of a distance between the light source and the light receiving element. ### Claim 6 An oxygen saturation measuring apparatus comprising: a sensor unit; and a main body, wherein the sensor unit comprises: a pad attachable to a human body; a plurality of light sources comprising a light source A and a light source B arranged on the pad adjacent to and spaced apart from one another, and that irradiate near-infrared light; a plurality of light receiving elements comprising a light receiving element A and a light receiving element B arranged on the pad adjacent to and spaced apart from one another and correspond one to one to the plurality of light sources with reference to a common center between 1) the light sources A and B, and 2) the light receiving elements A and B, and that receive transmitted light from the corresponding plurality of light sources, wherein distances between 1) the light source A and the light source B, 2) the light source B and the and the light receiving element B, and 3) the light receiving element A and the light receiving element B are the same; and a ROM unit that stores a reference value through measuring transmitted light using a phantom in advance, and the main body comprises: an arithmetic processing unit that calculates actual absorbance on the basis of a light receiving value and a reference value regarding an amount of receiving light stored by the ROM and computes an oxygen state of a living body to comply with the Beer-Lambert law while comparing the reference value.