Method and device for accurately measuring blood oxygen saturation based on photoacoustic technology

Abstract

The present invention discloses a method and a device for accurately measuring blood oxygen saturation based on a photoacoustic technology. The method comprises the following steps: exciting light source to emit two beams of light with different specific wavelengths, irradiating surfaces of tissues to be measured through an optical system, also conducting penetration into the tissues to enable oxygenated hemoglobin and reduced hemoglobin in the tissues to be measured to absorb the light beams to generate ultrasonic signals, collecting ultrasonic signals by using an ultrasonic signal acquisition module and measuring the ultrasonic signals, processing the ultrasonic signals by using an ultrasonic signal processing module, acquiring relative concentration of the oxygenated hemoglobin and reduced hemoglobin in blood by an image reconstruction algorithm and calculating absolute value of blood oxygen saturation of the blood of the tissues to be measured based on the relative value of the relative concentration. The provided measurement method has higher measurement accuracy than the existing blood oxygen saturation measuring instrument technology and at the same time solves a technical problem that the existing blood oxygen instrument cannot measure the blood oxygen saturation in venous blood vessels.

Description

technical field [0001] The invention relates to the technical field of medical measurement, in particular to a method and equipment for accurately measuring blood oxygen saturation based on photoacoustic technology. Background technique [0002] Oxygen in the human body is mainly provided by the reversible combination of oxyhemoglobin and reduced hemoglobin in the blood with oxygen. Usually, the volume of oxygenated hemoglobin in the blood accounts for the percentage of all oxygenable and hemoglobin volumes, that is, the concentration of oxygen in the blood, which is expressed as blood oxygen saturation. It is an important indicator reflecting the oxygen supply status in the human body and is also a clinical One of the basic monitoring parameters in medical treatment. The higher the oxygen content in the blood, the better a person's metabolism, and if it is too low, the body's oxygen supply will be insufficient. The blood oxygen saturation of normal human arterial blood is...

AI Technical Summary

Problems solved by technology

Most instruments do not specify the measurement uncertainty when the blood oxygen saturation is lower than 70%. Therefore, it is impossible to measure the venous blood oxygen saturation concentration by this conventional method. The detection of venous blood saturation concentration is very important for cardiopulmonary diseases The detection has important clinical value

Moreover, a measurement error of 2% is not conducive to the index value for doctors to judge patients from mild to severe for patients with new coronavirus pneumonia at this stage.

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