Respiration information obtaining apparatus, respiration information obtaining system, processing apparatus, and respiration information obtaining method

Patent metadata

Field	Value
Publication number	US-2024065574-A1
Application number	US-202318450124-A
Country	US
Kind code	A1
Filing date	Aug 15, 2023
Priority date	Aug 26, 2022
Publication date	Feb 29, 2024
Grant date	—

Abstract

A respiration information obtaining apparatus includes: a light emitter configured to emit a first light including a first wavelength and a second light including a second wavelength different from the first wavelength; a light detector that outputs a first signal and a second signal respectively corresponding to an intensity of the first light and an intensity of the second light after an interaction with a tissue of a subject, and a processor that calculates an index value based on a ratio between the first signal and the second signal, and obtains respiration information of the subject based on a change over time in the index value.

First claim

1 . A respiration information obtaining apparatus comprising:
a light emitter configured to emit a first light including a first wavelength and a second light including a second wavelength different from the first wavelength; a light detector that outputs a first signal and a second signal respectively corresponding to an intensity of the first light and an intensity of the second light after an interaction with a tissue of a subject, and a processor configured to calculate an index value based on a ratio between the first signal and the second signal, and obtains respiration information of the subject based on a change over time in the index value.

2 . The respiration information obtaining apparatus according to claim 1 , wherein
the first wavelength and the second wavelength are determined based on an absorption characteristic of a blood light absorber of the subject.

3 . The respiration information obtaining apparatus according to claim 1 , wherein
the index value is calculated based on a ratio of a first gradient, which is a gradient of a change over time of the first signal, and a second gradient, which is a gradient of a change over time of the second signal.

4 . The respiration information obtaining apparatus according to claim 3 , wherein
the index value is calculated by using a section in which a positive or negative sign of the first gradient and a positive or negative sign of the second gradient coincide with each other, an absolute value of the first gradient exceeds a first threshold, and an absolute value of the second gradient exceeds a second threshold.

5 . The respiration information obtaining apparatus according to claim 4 , wherein
the index value is calculated using a section in which both the first gradient and the second gradient are positive.

6 . The respiration information obtaining apparatus according to claim 4 , wherein
the index value is calculated using the first gradient and the second gradient obtained from a section corresponding to a same phase in one beat.

7 . The respiration information obtaining apparatus according to claim 1 , wherein
the respiration information includes at least one of a respiration rate and a respiration curve.

8 . A respiration information obtaining system comprising:
a first sensor including a light emitter and a light detector, and a respiration information obtaining apparatus including a processor, wherein the light emitter emits a first light including a first wavelength and a second light including a second wavelength different from the first wavelength, the light detector outputs a first signal and a second signal respectively corresponding to an intensity of the first light and an intensity of the second light after interacting with a tissue of a subject, and the processor configured to calculate an index value based on a ratio between the first signal and the second signal, and obtains first respiration information of the subject based on a change over time in the index value.

9 . The respiration information obtaining system according to claim 8 , further comprising:
a second sensor configured to obtain second respiration information of the subject by a method different from that of the first sensor, wherein the processing apparatus is configured to estimate a type of an apnea syndrome developed by the subject based on a combination of the first respiration information and the second respiration information.

10 . A processing apparatus comprising:
an interface configured to receive a first signal and a second signal respectively corresponding to an intensity of a first light including a first wavelength and an intensity of a second light including a second wavelength different from the first wavelength after being emitted from a light emitter and interacting with a tissue of a subject; and a processor configured to calculate an index value based on a ratio of the first signal and the second signal and obtain respiration information of the subject based on a change over time of the index value.

Assignees

• Nihon Kohden Corp
• Eiji Hirasawa

Inventors

• Ito Kazumasa
• Hirasawa Eiji

Classifications

• A61B5/6826

  Finger · CPC title

• A61B5/113

  occurring during breathing · CPC title

• A61B5/1455

  using optical sensors, e.g. spectral photometrical oximeters · CPC title

• A61B5/4818

  Sleep apnoea · CPC title

• A61B5/0816 Primary

  Measuring devices for examining respiratory frequency (measuring frequency of electric signals G01R23/00) · CPC title