Blood oxygen supply detecting instrument

Abstract

The invention relates to a blood oxygen supply detecting instrument, which comprises face skin color detecting equipment, pulse monitoring equipment, blood oxygen saturability monitoring equipment and a digital signal processor, wherein the face skin color detecting equipment determines the skin color grade of a tested person on the basis of the face recognition of the tested person; the pulse monitoring equipment monitors the pulse state of the tested person; the blood oxygen saturability monitoring equipment determines the blood oxygen saturability grade of the tested person; the digital signal processor determines the blood oxygen supply condition of the tested person on the basis of the skin color grade and the blood oxygen saturability grade. Through the blood oxygen supply detecting instrument, pulse data of the tested person can be automatically monitored, and meanwhile, two kinds of indexes are used for synthetically measuring the blood oxygen supply condition of the tested person.

Description

[0001] This invention is a divisional application of a patent with the application number 201510874798.7, the application date is December 2, 2015, and the invention name is "Blood Oxygen Supply Detector". technical field [0002] The invention relates to the field of blood oxygen detection, in particular to a blood oxygen supply detector. Background technique [0003] Blood oxygen saturation (SpO2) is the percentage of the capacity of oxygen-bound oxyhemoglobin (HbO2) in the blood to the total hemoglobin (Hb, hemoglobin) capacity that can be combined, that is, the concentration of blood oxygen in the blood, which is the respiratory cycle important physiological parameters. The functional oxygen saturation is the ratio of HbO2 concentration to HbO2+Hb concentration, which is different from the percentage of oxyhemoglobin. Therefore, monitoring arterial oxygen saturation (SaO2) allows estimation of lung oxygenation and hemoglobin oxygen-carrying capacity. [0004] The blood...

AI Technical Summary

Problems solved by technology

[0011] More specifically, the blood oxygen supply detector includes: a static storage device, which pre-stores preset skin color weights, preset blood oxygen saturation weights, preset trade-off lower limit thresholds, preset trade-off upper limit thresholds, black and white thresholds and the pixel number threshold, the black and white threshold is used to perform binarization processing on the image, and the static storage device also pre-stores four kinds of skin color mean intervals and four blood oxygen saturation intervals, and the four kinds of skin color mean value intervals are respectively Corresponding to four skin color levels, the four blood oxygen saturation intervals correspond to four blood oxygen saturation levels; a high-definition camera is used to shoot the face of the tested person to obtain the facial image of the tested person; facial skin color detection equipment Including image preprocessing sub-equipment, binarization processing sub-equipment, column edge detection sub-equipment, row edge detection sub-equipment, target segmentation sub-equipment, skin color extraction sub-equipment and skin color level identification sub-equipment, the image pre-processing sub-equipment and The high-definition camera is connected to sequentially perform adaptive edge enhancement and wavelet filter processing on the facial image of the person under test to obtain a pre-processed facial image; the binarization processing sub-equipment is connected with the image pre-processing sub-equipment and The static storage devices are respectively connected, and the brightness of each pixel of the preprocessed facial image is compared with the black and white threshold respectively, when the brightness of the pixel is greater than the black and white threshold, the pixel is recorded as a white pixel, when the pixel brightness When the brightness is less than the black-and-white threshold, the pixel is recorded as a black pixel, thereby obtaining a binarized facial image; the column edge detection sub-device is respectively connected with the binarization processing sub-device and the static storage device for For the binarized facial image, calculate the number of black pixels in each column, and record the column with the number of black pixels greater than or equal to the pixel number threshold as an edge column; the row edge detection sub-equipment and the binarization process The sub-equipment and the static storage device are connected respectively, and are used to calculate the number of black pixels in each row for the binarized facial image, and record the row with the number of black pixels greater than or equal to the pixel number threshold as an edge row; The target segmentation sub-equipment is respectively connected to the column edge detection sub-equipment and the row edge detection sub-equipment, and the interleaved area of ​​edge columns and edge rows is used as the target existence area, and is segmented from the binarized facial image Described target exists region to be output as face sub-image, to separate face sub-image from the background of measured person's facial image; Described skin color extracting sub-equipment is connected with described target segmentation sub-equipment, for facial sub-image, its The brightness of all pixels is accumulated and divided by the quantity of all pixels to obtain the target skin color mean value; the skin color level identification sub-equipment is connected with the skin color extraction sub-equipment and the static storage device respectively, and the target skin color mean value is combined with four The skin color mean range is matched, and the skin color level corresponding to the matched skin color mean range is output as the target skin color level output; the first resistor, one end is connected to the 5V power supply, and the other end is connected to the positive end of the infrared receiving diode; the second resistor, one end is connected to the positive end of the infrared receiving diode. 5V power supply connection, the other end is connected to one end of the third resistor; the third resistor, the other end is grounded, and has the same resistance value as the second resistor; the first dual operational amplifier is used to generate a reference voltage of 2.5V, and its The positive end is connected to the other end of the second resistor, the negative end is connected to one end of the first capacitor, the output end is connected to the negative end of the infrared emitting diode, and the negative end is also connected to the negative end of the infrared emitting diode; the first capacitor, the other end Grounding; the fourth resistor, one end is connected to the negative end of the infrared emitting diode; the second dual operational amplifier, the positive end is connected to the other end of the fourth resistor, the negative end is connected to the positive end of the infrared receiving diode, and the output end is used as a pulse voltage ; The fifth resistor is connected in parallel between the negative terminal of the second dual operational amplifier and the output terminal of the second dual operational amplifier; the second capacitor is connected in parallel between the negative terminal of the second dual operational amplifier and the output terminal of the second dual operational amplifier between; the infrared emitting diode is set at the position of the ear capillary of the measured person for emitting infrared light, and the negative end of the infrared emitting diode is connected with the positive end of the infrared receiving diode; the infrared receiving diode is set at the ear of the measured person The capillary position is located at the relative position of the infrared emitting diode, and is used to receive the infrared light transmitted through the ear capillary of the measured person; the light emitting diode is arranged at the capillary position of the fingertip of the measured person, and is connected with the light source driving circuit , for emitting infrared light and red light alternately based on the light-emitting control signal sent by the light source driving circuit; the light source driving circuit has a built-in timer for sending light-emitting control signals to the light-emitting diode; On the fingertip, it is located at the relative position of the light-emitting diode, and is used to receive the infrared light and red light transmitted through the capillaries of the fingertip of the person under test, and convert the transmitted infrared light and transmitted red light into analog current signals respectively, To obtain analog infrared photocurrent and analog red photocurrent; a current-voltage conversion circuit, connected to the photoelectric converter, is used to respectively perform current-voltage conversion on the analog infrared photocurrent and the analog red photocurrent to obtain analog infrared photovoltage respectively and the analog red light voltage; the signal amplifier is connected with the current-voltage conversion circuit for respectively amplifying the analog infrared light voltage and the analog red light voltage to obtain the analog infrared light amplification voltage and the analog red light amplification voltage; signal detection A circuit, connected to the signal amplifier, including a DC signal detection subcircuit and an AC signal detection subcircuit, for detecting the DC component and the AC component in the analog infrared photovoltage to output as the first DC voltage and the first AC voltage, It is also used to detect the DC component and the AC component in the analog red light voltage to output as the second DC voltage and the second AC voltage; the analog-to-digital converter is connected to the signal detection circuit and is used for the first DC voltage, Analog-to-digital conversion is performed on the first AC voltage, the second DC voltage, and the second AC voltage to obtain the first digitized DC voltage, the first digitized AC voltage, the second digitized DC voltage, and the second digitized AC voltage; a digital signal processor , respectively connected to the analog-to-digital converter, the static storage device and the facial skin color detection device, dividing the ratio of the second digitized AC voltage to the second digitized DC voltage by the first digitized AC voltage and the first digitized DC voltage The ratio of the voltages to obtain the absorbed light ratio factor, and calculate the blood oxygen saturation based on the absorbed light ratio factor, wherein the blood oxygen saturation is linearly related to the absorbed light ratio factor; the digital signal processor is also connected with the second dual The output terminal of the operational amplifier is connected to obtain the pulse voltage, and when the pulse voltage is outside the preset pulse range, an abnormal pulse identification signal is sent; wherein, the digital signal processor calculates the obtained blood oxygen saturation Match the blood oxygen saturation level with the four blood oxygen saturation intervals, and use the blood oxygen saturation level corresponding to the successfully matched blood oxygen saturation interval as the target blood oxygen saturation level; wherein, the photoelectric converter is a photodiode ; Wherein, a signal filter circuit is also set between the signal amplifier and the signal detection circuit, for filtering out noise components in the analog infrared light amplification voltage and the analog red light amplification voltage; wherein, when the infrared emitting diode and the infrared light When there is no pulse between the receiving diodes, the pulse voltage is 2.5V. When there is a beating pulse between the infrared emitting diode and the infrared receiving diode, the blood pulse makes the light transmittance of the ear worse, and the pulse voltage is greater than 2.5V; wherein, the The digital signal processor multiplies the target skin color level by the preset skin color weight, multiplies the target blood oxygen saturation level by the preset blood oxygen saturation weight, and adds the two products to obtain the total weight value. When the total weight value is less than When it is equal to the preset trade-off lower limit threshold, a hypoxemia identification signal is issued, and when the total trade-off value is greater than or equal to the preset trade-off upper limit threshold, an excess blood oxygen identification signal is issued

Images