US 6,415,236 B1 · Apparatus for determining concentrations of hemoglobins

Abstract

An apparatus for determining concentrations of hemoglobins additionally uses a light source 3 which emits light of a third wavelength in an orangy red wavelength region of 590 to 660 nm. The apparatus includes light receiving means 6 for receiving lights that are emitted by the light sources and transmitted through or reflected by a living tissue, attenuation ratio processing means 15 for processing attenuation ratios Φ on the wavelengths based on variations of signals associated with the wavelengths output from the light receiving means, which variations are caused by a pulsation of blood, and concentration ratio processing means 16 for processing concentration ratios of at least oxyhemoglobin, deoxyhemoglobin and carboxyhemoglobin based on the output signals from the attenuation ratio processing means. The apparatus thus constructed can properly measure carboxyhemoglobin COHb, and present its concentration display and an alarm display in a simple manner, which is clinically effective.

Claims17

Dependent claims

An apparatus for determining concentrations of hemoglobins comprising:

a light source for emitting lights of at least three different wavelengths, a first wavelength in a near-infrared wavelength region of 790 to 100 nm, a second wavelength in a red wavelength region of 640 to 675 nm, and a third wavelength in an orangy red wavelength region of 590 to 660 nm;
light receiving means for receiving light emitted by said light source, transmitted through a living tissue or reflected by the living tissue;
attenuation ratio processing means for processing attenuation ratios on said wavelengths based on variations of signals associated with said wavelengths output from said light receiving means, said variations are caused by a pulsation of blood;
and
concentration ratio processing means for processing concentration ratios of at least oxyhemoglobin, deoxyhemoglobin and carboxyhemoglobin based on the output signals from said attenuation ratio processing means.

2 more elements

An apparatus for determining concentrations of hemoglobins comprising:

a light source for emitting lights of different wavelengths;
light receiving means for receiving light emitted by said light source , transmitted through or reflected by a living tissue;
attenuation ratio processing means for processing attenuation ratios on said wavelengths based on variations of signals associated with said wavelengths output from said light receiving means, which variations are caused by a pulsation of blood;
concentration ratio processing means for processing concentration ratios of at least oxyhemoglobin, deoxyhemoglobin and carboxyhemoglobin based on the output signals from said attenuation ratio processing means;
and
select means for giving an instruction to process a concentration ratio of carboxyhemoglobin;
wherein when said select means does not give an instruction to process a concentration ratio of carboxyhemoglobin, said concentration ratio processing means processes concentration ratios of oxyhemoglobin and deboxyhemoglobin on the basis of variations of signals output from said light receiving means upon reception of lights of at least two different wavelengths that are emitted from said light source and transmitted through and reflected by a living tissue, and when said select means gives an instruction to process a concentration ratio of carboxyhemoglobin, said concentration ratio processing means processes concentration ratios of oxyhemoglobin, deoxyhemoglobin and carboxyhemoglobin on the basis of variations of signals output from said light receiving means upon reception of lights of at least three different wavelengths that are emitted from said light source and transmitted through and reflected by a living tissue.

4 more elements

Dependencies are inferred from the claim text.

Apparatus for determining concentrations of hemoglobins

Life of this patent

Apparatus for determining concentrations of hemoglobins

Life of this patent

Abstract

Claims17