Signal processing method, and pulse photometer using the method

• US 20060287588A1
• Filed: 07/28/2006
• Published: 12/21/2006
• Est. Priority Date: 10/31/2002
• Status: Abandoned Application

• Current Assignee: Nihon Kohden Corporation
• Original Assignee: Nihon Kohden Corporation
• Inventors: Yarita, Masaru
• Application Number:
  US11/494,508
• Publication Number:
  US 20060287588A1
• Time in Patent Office: Days
• US Class Current: 600/323
• CPC Class Codes: A61B 5/14551 for measuring blood gases

Abstract

A pulse photometer adapted to observe a pulse wave of a living body is disclosed. A light emitter is adapted to irradiate the living body with a first light beam having a first wavelength and a second light beam having a second wavelength which is different from the first wavelength. A converter is operable to convert the first light beam and the second light beam, which have been reflected or transmitted from the living body, into a first data set corresponding to the first wavelength and a second data set corresponding to the second wavelength. A processor is operable to process the first data set and the second data set with a rotating matrix to separate a signal component and a noise component contained in the pulse wave.

Claims

1. A pulse photometer, comprising

a light emitter, adapted to irradiate a living body with a first light beam having a first wavelength and a second light beam having a second wavelength which is different from the first wavelength;

a converter, operable to convert the first light beam and the second light beam, which have been reflected or transmitted from the living body, into a first data set corresponding to the first wavelength and a second data set corresponding to the second wavelength; and

a processor, operable to;

plot the first data set and the second data set on a two-dimensional orthogonal coordinate system corresponding to the first wavelength and the second wavelength;

calculate a first norm value for the first data set and a second norm value for the second data set to obtain a norm ratio of the first norm value and the second norm value; and

obtain a concentration of at least one light-absorbing material in blood of the living body, based on the norm ratio.

2. The pulse photometer as set forth in claim 1, wherein the concentration of the light-absorbing material is at least one of an oxygen saturation in arterial blood, a concentration of abnormal hemoglobin in arterial blood, and a concentration of injected dye in arterial blood.