CN105310656A - Blood oxygen supply detector - Google Patents
Blood oxygen supply detector Download PDFInfo
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- CN105310656A CN105310656A CN201510874798.7A CN201510874798A CN105310656A CN 105310656 A CN105310656 A CN 105310656A CN 201510874798 A CN201510874798 A CN 201510874798A CN 105310656 A CN105310656 A CN 105310656A
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- oxygen saturation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
- A61B5/14551—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters for measuring blood gases
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0062—Arrangements for scanning
- A61B5/0064—Body surface scanning
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6813—Specially adapted to be attached to a specific body part
- A61B5/6814—Head
- A61B5/6815—Ear
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6813—Specially adapted to be attached to a specific body part
- A61B5/6825—Hand
- A61B5/6826—Finger
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7221—Determining signal validity, reliability or quality
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7225—Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation
Abstract
The invention relates to a blood oxygen supply detector which comprises a face skin color detection device, a pulse monitoring device, a blood oxygen saturation monitoring device and a digital signal processor. The face skin color detection device recognizes and determines the skin color grade of a testee on the basis of the face of the testee. The pulse monitoring device monitors the pulse state of the testee. The blood oxygen saturation monitoring device determines the blood oxygen saturation grade of the testee. The digital signal processor determines the blood oxygen supply condition of the testee on the basis of the skin color grade and the blood oxygen saturation grade. By means of the blood oxygen supply detector, the blood oxygen supply conditions of the testee are comprehensively measured through two indexes while pulse data of the testee can be automatically monitored.
Description
Technical field
The present invention relates to blood oxygen detection field, particularly relate to a kind of blood oxygen supply detector.
Background technology
Blood oxygen saturation (SpO2) is that the capacity of the HbO2 Oxyhemoglobin (HbO2) combined by oxygen in blood accounts for whole combinative hemoglobin (Hb, hemoglobin) percentage ratio of capacity, the i.e. concentration of blood oxygen in blood, it is the important physiological parameter of breath cycle.And functional oxygen saturation is HbO2 concentration and the ratio of HbO2+Hb concentration, be different from percent shared by HbO2 Oxyhemoglobin.Therefore, monitor arterial oxygen saturation (SaO2) to estimate the oxygenate of lung and hemoglobin oxygen carrying capacity.
The blood oxygen saturation of normal human's arterial blood is 98%, and venous blood is 75%.The metabolic processes of human body is biological oxidation process, and oxygen required in metabolic processes, enter blood of human body by respiratory system, with the hemoglobin (Hb) in blood rbc, be combined into HbO2 Oxyhemoglobin (HbO2), then be transported to partes corporis humani and divide in histiocyte and go.Namely the ability that blood carries delivering oxygen is weighed by blood oxygen saturation.
Because many clinical diseases can cause the shortage of oxygen supply, directly affect the eubolism of cell, the serious life that also can threaten people, so the Real-Time Monitoring of blood oxygen saturation is extremely important in clinical rescue.Be advanced row human blood collection to measurement method of blood oxygen saturation in prior art, recycling blood gas analyzer carries out electro chemical analysis, measures blood oxygen pressure and calculates blood oxygen saturation.This Measures compare trouble, and can not continuous print monitoring be carried out.
Also there are some finger cot type photoelectric sensors in prior art, during measurement, only need by sensor sleeve on finger, utilize finger as the transparent vessel of splendid attire hemoglobin, the HONGGUANG of use wavelength 660nm and the near infrared light of 940nm are as injecting light source, measure the light conductive strength by tissue bed, calculate hemoglobin concentration and blood oxygen saturation.
But all there is following defect in blood oxygen saturation detection scheme of the prior art: can only detect blood oxygen saturation, and the object of detection is more single; Testing mechanism falls behind, and structural redundancy is too high, and precision can not meet the accuracy requirement increasingly increased; Significantly, the detection mechanism of blood oxygen saturation is uniquely changed, can only by one because usually determining blood oxygen saturation, the inadequate science of testing process.
Therefore, the present invention proposes a kind of blood oxygen supply detector, the structure of backward blood oxygen saturation detecting instrument can be improved, pulse detection is dissolved in blood oxygen saturation detection, widens the scope of the physiological parameter of detection, improve the accuracy of detection of blood oxygen saturation, in addition, photoelectric sense technology and image recognition technology can also be combined the concentration determining blood oxygen saturation, thus, improve the accuracy of detection of blood oxygen saturation instrument on the whole.
Summary of the invention
In order to solve the technical problem that prior art exists, the invention provides a kind of blood oxygen supply detector, optimize the structure of current blood oxygen saturation detecting instrument, pulse detection is incorporated in blood oxygen saturation detection, improve the accuracy of detection of blood oxygen saturation, meanwhile, adopt the colour of skin of image recognition technology to tested personnel targetedly to identify, one of factor detect the colour of skin as blood oxygen saturation, makes the testing result of blood oxygen saturation not be subject to the interference of single factors.
According to an aspect of the present invention, provide a kind of blood oxygen supply detector, described detector comprises blee checkout equipment, pulse monitoring equipment, blood oxygen saturation watch-dog and digital signal processor, described blee checkout equipment determines the colour of skin grade of tested personnel based on the facial recognition of tested personnel, described pulse monitoring equipment is monitored tested personnel's pulse state, the blood oxygen saturation grade of tested personnel determined by described blood oxygen saturation watch-dog, described digital signal processor determines the blood oxygen supply situation of tested personnel based on described colour of skin grade and described blood oxygen saturation grade.
More specifically, in described blood oxygen supply detector, comprise: static storage device, prestore default colour of skin weight, preset blood oxygen saturation weight, preset balance lower threshold, preset balance upper limit threshold, black and white threshold value and threshold number of pixels, described black and white threshold value is used for performing binary conversion treatment to image, described static storage device has also prestored four kinds of colour of skin mean value interval and four kinds of blood oxygen saturation intervals, described four kinds of colour of skin mean value interval are corresponding four kinds of colour of skin grades respectively, described four kinds of blood oxygen saturations interval corresponding four kinds of blood oxygen saturation grades respectively, high-definition camera, for taking tested personnel's face, to obtain tested personnel's face-image, blee checkout equipment comprises Image semantic classification subset, binary conversion treatment subset, column border detection subset, row rim detection subset, Target Segmentation subset, skin cluster subset and colour of skin grade recognin equipment, described Image semantic classification subset is connected with described high-definition camera, strengthen and wavelet filtering process to perform adaptive edge successively to described tested personnel's face-image, to obtain pretreatment face-image, described binary conversion treatment subset is connected respectively with described Image semantic classification subset and described static storage device, the brightness of each pixel of described pretreatment face-image is compared respectively with described black and white threshold value, when the brightness of pixel is greater than described black and white threshold value, pixel is designated as white pixel, when the brightness of pixel is less than described black and white threshold value, pixel is designated as black picture element, thus obtains binaryzation face-image, described column border detects subset and is connected respectively with described binary conversion treatment subset and described static storage device, for to described binaryzation face-image, calculate the number of often row black picture element, the row that the number of black picture element is more than or equal to described threshold number of pixels are designated as edge columns, described row rim detection subset is connected respectively with described binary conversion treatment subset and described static storage device, for to described binaryzation face-image, calculate the number of often row black picture element, the row that the number of black picture element is more than or equal to described threshold number of pixels is designated as edge lines, described Target Segmentation subset and described column border detect subset and described row rim detection subset is connected respectively, region edge columns and edge lines interweaved is as target domain of the existence, and from described binaryzation face-image, be partitioned into described target domain of the existence to export as facial subimage, the background of facial subimage from tested personnel's face-image to be separated, described skin cluster subset is connected with described Target Segmentation subset, for facial subimage, the brightness of its all pixel to be added up and divided by the quantity of its all pixel to obtain target colour of skin average, described colour of skin grade recognin equipment is connected respectively with described skin cluster subset and described static storage device, described target colour of skin average mated with four kinds of colour of skin mean value interval, the colour of skin grade corresponding to colour of skin mean value interval of output matching exports as target colour of skin grade, first resistance, one end is connected with 5V power supply, and the other end is connected with the anode of infrared receiving diode, second resistance, one end is connected with 5V power supply, and the other end is connected with one end of the 3rd resistance, 3rd resistance, other end ground connection, and there is the resistance identical with the second resistance, first two-way operational amplifier, for generation of the reference voltage of 2.5V, its anode is connected with the other end of the second resistance, and negative terminal is connected with one end of the first electric capacity, outfan is connected with the negative terminal of infrared-emitting diode, and negative terminal is also connected with the negative terminal of infrared-emitting diode, first electric capacity, other end ground connection, 4th resistance, one end is connected with the negative terminal of infrared-emitting diode, second two-way operational amplifier, anode is connected with the other end of the 4th resistance, and negative terminal is connected with the anode of infrared receiving diode, and outfan is as pulse voltage, 5th resistance, is connected in parallel between the second two-way operational amplifier negative terminal and the second two-way operational amplifier output terminal, second electric capacity, is connected in parallel between the second two-way operational amplifier negative terminal and the second two-way operational amplifier output terminal, infrared-emitting diode, is arranged on tested personnel ear blood capillary position, and for launching infrared light, the negative terminal of infrared-emitting diode is connected with the anode of infrared receiving diode, infrared receiving diode, is arranged on tested personnel ear blood capillary position, is positioned at the relative position of described infrared-emitting diode, for receiving the infrared light after transmission tested personnel ear blood capillary, light emitting diode, is arranged on tested personnel's finger fingertip blood capillary position, is connected with light source driving circuit, for the LED control signal sent based on light source driving circuit, and alternate emission infrared light and HONGGUANG, light source driving circuit, built-in timer, for sending LED control signal to described light emitting diode, optical-electrical converter, be arranged on tested personnel's finger fingertip, be positioned at the relative position of described light emitting diode, for receiving the infrared light after transmission tested personnel finger fingertip blood capillary and HONGGUANG, and transmitted infrared light and transmit red light are converted to analog current signal respectively, to obtain simulation infrared light electric current and simulation HONGGUANG electric current, current-to-voltage converting circuit, is connected with described optical-electrical converter, for carrying out current/voltage conversion respectively to simulation infrared light electric current and simulation HONGGUANG electric current, to obtain simulation infrared light voltage and simulation red voltages respectively, signal amplifier, is connected with described current-to-voltage converting circuit, for amplifying respectively with simulation red voltages simulation infrared light voltage, amplifies voltage to obtain simulation infrared light amplification voltage and to simulate HONGGUANG, signal deteching circuit, be connected with described signal amplifier, comprise direct current signal and detect electronic circuit and alternating current signal detection electronic circuit, for detecting flip-flop in simulation infrared light voltage and alternating component, to export as the first DC voltage and the first alternating voltage, also for detecting flip-flop in simulation red voltages and alternating component, to export as the second DC voltage and the second alternating voltage, analog-digital converter, be connected with described signal deteching circuit, for carrying out analog digital conversion respectively to the first DC voltage, the first alternating voltage, the second DC voltage and the second alternating voltage, to obtain the first Digital DC voltage, the first Digital AC voltage, the second Digital DC voltage and the second Digital AC voltage, digital signal processor, be connected respectively with described analog-digital converter, described static storage device and described blee checkout equipment, by the ratio of the second Digital AC voltage and the second Digital DC voltage divided by the ratio of the first Digital AC voltage and the first Digital DC voltage to obtain the absorbing light ratio factor, and calculate blood oxygen saturation based on the absorbing light ratio factor, wherein, blood oxygen saturation and the absorbing light ratio factor linear, described digital signal processor is also connected to obtain described pulse voltage with the outfan of described second two-way operational amplifier, and when described pulse voltage is outside default pulse range, sends cacosphyxia identification signal, wherein, described digital signal processor mates calculating the blood oxygen saturation obtained with described four kinds of blood oxygen saturation intervals, using the blood oxygen saturation grade corresponding to the blood oxygen saturation interval that the match is successful as target blood oxygen saturation grade, wherein, described optical-electrical converter is a photodiode, wherein, between described signal amplifier and described signal deteching circuit, go back signalization filter circuit, amplify the noise contribution in voltage and simulation HONGGUANG amplification voltage for filtering simulation infrared light, wherein, between infrared-emitting diode and infrared receiving diode during pulseless, pulse voltage is 2.5V, and when there is the pulse of beating between infrared-emitting diode and infrared receiving diode, blood vessels make ear's light transmission be deteriorated, and pulse voltage is greater than 2.5V, wherein, described digital signal processor is by target colour of skin grade and default colour of skin multiplied by weight, by target blood oxygen saturation grade and default blood oxygen saturation multiplied by weight, by two product addition to obtain total trade-off value, when total trade-off value is less than or equal to default balance lower threshold, send hypoxemia identification signal, when total trade-off value is more than or equal to default balance upper limit threshold, send blood oxygen excess identification signal.
More specifically, in described blood oxygen supply detector, described detector also comprises: bluetooth communication interface, is connected with described digital signal processor, for cacosphyxia identification signal, hypoxemia identification signal or blood oxygen excess identification signal being sent to the medical monitoring Cloud Server of far-end.
More specifically, in described blood oxygen supply detector: the wavelength of the infrared light that described light emitting diode is launched is 940nm, the wavelength of the HONGGUANG that described light emitting diode is launched is 660nm.
More specifically, in described blood oxygen supply detector: the first two-way operational amplifier and the second two-way operational amplifier are all the two-way operational amplifier of TI company.
More specifically, in described blood oxygen supply detector: Image semantic classification subset, binary conversion treatment subset, column border detect subset, row rim detection subset, Target Segmentation subset, skin cluster subset and colour of skin grade recognin equipment and adopt different fpga chips respectively to realize.
Accompanying drawing explanation
Below with reference to accompanying drawing, embodiment of the present invention are described, wherein:
Fig. 1 is the block diagram of the first embodiment of blood oxygen supply detector of the present invention.
Reference numeral: 1 blee checkout equipment; 2 pulse monitoring equipment; 3 blood oxygen saturation watch-dogs; 4 digital signal processors
Detailed description of the invention
Below with reference to accompanying drawings the embodiment of blood oxygen supply detector of the present invention is described in detail.
Anoxia is the imbalance occurred between the confession of body oxygen and oxygen consume, and namely histiocyte metabolism is in anoxia state.Whether anoxia depends on that can the O_2 transport amount that each tissue accepts and oxygen reserve meet the needs of aerobic metabolism to body.The harm of anoxia and degree of oxygen deficiency, there is speed and the persistent period relevant.Severe hypoxia mass formed by blood stasis is the common cause of anesthetic death, accounts for 1/3 to 2/3 of sudden cardiac arrest or serious brain cell infringement death.
Anoxia has tremendous influence to body.Such as to CNS, the impact of Liver and kidney function.What first occur during hypoxia is that compensatory heart rate accelerates, and heartbeat and cardiac output increase, and blood circulation is with the deficiency of the compensatory oxygen content of hyperkinetic state.Produce blood flow reallocation, brain and the expansion of crown cardioselective are to ensure that enough blood supplies simultaneously.But when serious hypoxic condition, because lactic acid under endocardium is piled up, ATP synthesize reduction, generation myocardiac inhibition, and cause bradycardia, premature beat, blood pressure drops and cardiac output reduce, and the arrhythmia and even stop fighting such as to quiver in the room of appearance.
Because anoxia is to the hazardness of people's health, blood oxygen saturation detecting instrument is one of problem of Medical Instruments developer emphasis research and development always.But current blood oxygen saturation detecting instrument detected object is single, circuit structure redundancy is high and it is comprehensive not to detect mechanism, causes the poor effect that blood oxygen saturation detects, cannot meet the current demand of patient and hospital.
For this reason, the present invention has built a kind of blood oxygen supply detector, optimize the structure of current blood oxygen saturation detecting instrument, pulse detection is incorporated in blood oxygen saturation detection, more crucially, the colour of skin of high-precision image recognition technology to tested personnel is adopted to identify, one of factor detect the colour of skin as blood oxygen saturation, consider the testing result of blood oxygen saturation, thus improve the reasonability of testing result.
Fig. 1 is the block diagram of the first embodiment of blood oxygen supply detector of the present invention, described detector comprises blee checkout equipment, pulse monitoring equipment, blood oxygen saturation watch-dog and digital signal processor, described blee checkout equipment determines the colour of skin grade of tested personnel based on the facial recognition of tested personnel, described pulse monitoring equipment is monitored tested personnel's pulse state, the blood oxygen saturation grade of tested personnel determined by described blood oxygen saturation watch-dog, described digital signal processor determines the blood oxygen supply situation of tested personnel based on described colour of skin grade and described blood oxygen saturation grade.
Then, continue to be further detailed the concrete structure of the second embodiment of blood oxygen supply detector of the present invention.
Described detector comprises: static storage device, prestore default colour of skin weight, preset blood oxygen saturation weight, preset balance lower threshold, preset balance upper limit threshold, black and white threshold value and threshold number of pixels, described black and white threshold value is used for performing binary conversion treatment to image, described static storage device has also prestored four kinds of colour of skin mean value interval and four kinds of blood oxygen saturation intervals, described four kinds of colour of skin mean value interval are corresponding four kinds of colour of skin grades respectively, described four kinds of blood oxygen saturations interval corresponding four kinds of blood oxygen saturation grades respectively.
Described detector comprises: high-definition camera, for taking tested personnel's face, to obtain tested personnel's face-image.
Described detector comprises: blee checkout equipment, comprise Image semantic classification subset, binary conversion treatment subset, column border detection subset, row rim detection subset, Target Segmentation subset, skin cluster subset and colour of skin grade recognin equipment, described Image semantic classification subset is connected with described high-definition camera, strengthen and wavelet filtering process to perform adaptive edge successively to described tested personnel's face-image, to obtain pretreatment face-image; Described binary conversion treatment subset is connected respectively with described Image semantic classification subset and described static storage device, the brightness of each pixel of described pretreatment face-image is compared respectively with described black and white threshold value, when the brightness of pixel is greater than described black and white threshold value, pixel is designated as white pixel, when the brightness of pixel is less than described black and white threshold value, pixel is designated as black picture element, thus obtains binaryzation face-image; Described column border detects subset and is connected respectively with described binary conversion treatment subset and described static storage device, for to described binaryzation face-image, calculate the number of often row black picture element, the row that the number of black picture element is more than or equal to described threshold number of pixels are designated as edge columns; Described row rim detection subset is connected respectively with described binary conversion treatment subset and described static storage device, for to described binaryzation face-image, calculate the number of often row black picture element, the row that the number of black picture element is more than or equal to described threshold number of pixels is designated as edge lines; Described Target Segmentation subset and described column border detect subset and described row rim detection subset is connected respectively, region edge columns and edge lines interweaved is as target domain of the existence, and from described binaryzation face-image, be partitioned into described target domain of the existence to export as facial subimage, the background of facial subimage from tested personnel's face-image to be separated; Described skin cluster subset is connected with described Target Segmentation subset, for facial subimage, the brightness of its all pixel to be added up and divided by the quantity of its all pixel to obtain target colour of skin average; Described colour of skin grade recognin equipment is connected respectively with described skin cluster subset and described static storage device, described target colour of skin average mated with four kinds of colour of skin mean value interval, the colour of skin grade corresponding to colour of skin mean value interval of output matching exports as target colour of skin grade.
Described detector comprises: the first resistance, and one end is connected with 5V power supply, and the other end is connected with the anode of infrared receiving diode; Second resistance, one end is connected with 5V power supply, and the other end is connected with one end of the 3rd resistance; 3rd resistance, other end ground connection, and there is the resistance identical with the second resistance; First two-way operational amplifier, for generation of the reference voltage of 2.5V, its anode is connected with the other end of the second resistance, and negative terminal is connected with one end of the first electric capacity, outfan is connected with the negative terminal of infrared-emitting diode, and negative terminal is also connected with the negative terminal of infrared-emitting diode.
Described detector comprises: the first electric capacity, other end ground connection; 4th resistance, one end is connected with the negative terminal of infrared-emitting diode; Second two-way operational amplifier, anode is connected with the other end of the 4th resistance, and negative terminal is connected with the anode of infrared receiving diode, and outfan is as pulse voltage; 5th resistance, is connected in parallel between the second two-way operational amplifier negative terminal and the second two-way operational amplifier output terminal; Second electric capacity, is connected in parallel between the second two-way operational amplifier negative terminal and the second two-way operational amplifier output terminal.
Described detector comprises: infrared-emitting diode, is arranged on tested personnel ear blood capillary position, and for launching infrared light, the negative terminal of infrared-emitting diode is connected with the anode of infrared receiving diode; Infrared receiving diode, is arranged on tested personnel ear blood capillary position, is positioned at the relative position of described infrared-emitting diode, for receiving the infrared light after transmission tested personnel ear blood capillary; Light emitting diode, is arranged on tested personnel's finger fingertip blood capillary position, is connected with light source driving circuit, for the LED control signal sent based on light source driving circuit, and alternate emission infrared light and HONGGUANG.
Described detector comprises: light source driving circuit, built-in timer, for sending LED control signal to described light emitting diode; Optical-electrical converter, be arranged on tested personnel's finger fingertip, be positioned at the relative position of described light emitting diode, for receiving the infrared light after transmission tested personnel finger fingertip blood capillary and HONGGUANG, and transmitted infrared light and transmit red light are converted to analog current signal respectively, to obtain simulation infrared light electric current and simulation HONGGUANG electric current; Current-to-voltage converting circuit, is connected with described optical-electrical converter, for carrying out current/voltage conversion respectively to simulation infrared light electric current and simulation HONGGUANG electric current, to obtain simulation infrared light voltage and simulation red voltages respectively.
Described detector comprises: signal amplifier, is connected with described current-to-voltage converting circuit, for amplifying respectively with simulation red voltages simulation infrared light voltage, amplifies voltage to obtain simulation infrared light amplification voltage and to simulate HONGGUANG; Signal deteching circuit, be connected with described signal amplifier, comprise direct current signal and detect electronic circuit and alternating current signal detection electronic circuit, for detecting flip-flop in simulation infrared light voltage and alternating component, to export as the first DC voltage and the first alternating voltage, also for detecting flip-flop in simulation red voltages and alternating component, to export as the second DC voltage and the second alternating voltage.
Described detector comprises: analog-digital converter, be connected with described signal deteching circuit, for carrying out analog digital conversion respectively to the first DC voltage, the first alternating voltage, the second DC voltage and the second alternating voltage, to obtain the first Digital DC voltage, the first Digital AC voltage, the second Digital DC voltage and the second Digital AC voltage.
Described detector comprises: digital signal processor, be connected respectively with described analog-digital converter, described static storage device and described blee checkout equipment, by the ratio of the second Digital AC voltage and the second Digital DC voltage divided by the ratio of the first Digital AC voltage and the first Digital DC voltage to obtain the absorbing light ratio factor, and calculate blood oxygen saturation based on the absorbing light ratio factor.
Wherein, blood oxygen saturation and the absorbing light ratio factor linear; Described digital signal processor is also connected to obtain described pulse voltage with the outfan of described second two-way operational amplifier, and when described pulse voltage is outside default pulse range, sends cacosphyxia identification signal; Wherein, described digital signal processor mates calculating the blood oxygen saturation obtained with described four kinds of blood oxygen saturation intervals, using the blood oxygen saturation grade corresponding to the blood oxygen saturation interval that the match is successful as target blood oxygen saturation grade.
Wherein, described optical-electrical converter is a photodiode; Wherein, between described signal amplifier and described signal deteching circuit, go back signalization filter circuit, amplify the noise contribution in voltage and simulation HONGGUANG amplification voltage for filtering simulation infrared light; Wherein, between infrared-emitting diode and infrared receiving diode during pulseless, pulse voltage is 2.5V, and when there is the pulse of beating between infrared-emitting diode and infrared receiving diode, blood vessels make ear's light transmission be deteriorated, and pulse voltage is greater than 2.5V.
Wherein, described digital signal processor is by target colour of skin grade and default colour of skin multiplied by weight, by target blood oxygen saturation grade and default blood oxygen saturation multiplied by weight, by two product addition to obtain total trade-off value, when total trade-off value is less than or equal to default balance lower threshold, send hypoxemia identification signal, when total trade-off value is more than or equal to default balance upper limit threshold, send blood oxygen excess identification signal.
Alternatively, in described detector, also comprise: bluetooth communication interface, be connected with described digital signal processor, for cacosphyxia identification signal, hypoxemia identification signal or blood oxygen excess identification signal being sent to the medical monitoring Cloud Server of far-end; The wavelength of the infrared light that described light emitting diode is launched is 940nm, and the wavelength of the HONGGUANG that described light emitting diode is launched is 660nm; First two-way operational amplifier and the second two-way operational amplifier are all the two-way operational amplifier of TI company; Image semantic classification subset, binary conversion treatment subset, column border detect subset, row rim detection subset, Target Segmentation subset, skin cluster subset and colour of skin grade recognin equipment and adopt different fpga chips respectively to realize.
In addition, dsp chip, also claims digital signal processor, and be a kind of microprocessor being particularly suitable for carrying out Digital Signal Processing computing, it is mainly applied is realize various digital signal processing algorithm real-time.
According to the requirement of Digital Signal Processing, dsp chip generally has following main feature: (1) can complete a multiplication and a sub-addition within an instruction cycle; (2) program and data space separately, can access instruction and data simultaneously; (3) there is quick RAM in sheet, usually access in two pieces by independently data/address bus simultaneously; (4) there is low expense or the hardware supported without overhead loop and redirect; (5) interrupt processing fast and Hardware I/O support; (6) there are the multiple hardware address generators operated within the monocycle; (7) can the multiple operation of executed in parallel; (8) support pile line operation, fetching, decoding and execution etc. are operated can Overlapped Execution.
Adopt blood oxygen supply detector of the present invention, for in prior art, blood oxygen saturation detecting instrument structure is backward, detected object is few and detect the single technical problem of mechanism, refer to high accuracy, the targetedly image recognition apparatus colour of skin to tested personnel to identify, and be dissolved in the testing process of blood oxygen saturation, simultaneously, add pulse detection equipment and optimize existing detection architecture, thus improving the performance of blood oxygen saturation detecting instrument comprehensively.
Be understandable that, although the present invention with preferred embodiment disclose as above, but above-described embodiment and be not used to limit the present invention.For any those of ordinary skill in the art, do not departing under technical solution of the present invention ambit, the technology contents of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solution of the present invention, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs in the scope of technical solution of the present invention protection.
Claims (6)
1. a blood oxygen supply detector, described detector comprises blee checkout equipment, pulse monitoring equipment, blood oxygen saturation watch-dog and digital signal processor, described blee checkout equipment determines the colour of skin grade of tested personnel based on the facial recognition of tested personnel, described pulse monitoring equipment is monitored tested personnel's pulse state, the blood oxygen saturation grade of tested personnel determined by described blood oxygen saturation watch-dog, and described digital signal processor determines the blood oxygen supply situation of tested personnel based on described colour of skin grade and described blood oxygen saturation grade.
2. blood oxygen supply detector as claimed in claim 1, it is characterized in that, described detector comprises:
Static storage device, prestore default colour of skin weight, preset blood oxygen saturation weight, preset balance lower threshold, preset balance upper limit threshold, black and white threshold value and threshold number of pixels, described black and white threshold value is used for performing binary conversion treatment to image, described static storage device has also prestored four kinds of colour of skin mean value interval and four kinds of blood oxygen saturation intervals, described four kinds of colour of skin mean value interval are corresponding four kinds of colour of skin grades respectively, described four kinds of blood oxygen saturations interval corresponding four kinds of blood oxygen saturation grades respectively;
High-definition camera, for taking tested personnel's face, to obtain tested personnel's face-image;
Blee checkout equipment comprises Image semantic classification subset, binary conversion treatment subset, column border detection subset, row rim detection subset, Target Segmentation subset, skin cluster subset and colour of skin grade recognin equipment, described Image semantic classification subset is connected with described high-definition camera, strengthen and wavelet filtering process to perform adaptive edge successively to described tested personnel's face-image, to obtain pretreatment face-image; Described binary conversion treatment subset is connected respectively with described Image semantic classification subset and described static storage device, the brightness of each pixel of described pretreatment face-image is compared respectively with described black and white threshold value, when the brightness of pixel is greater than described black and white threshold value, pixel is designated as white pixel, when the brightness of pixel is less than described black and white threshold value, pixel is designated as black picture element, thus obtains binaryzation face-image; Described column border detects subset and is connected respectively with described binary conversion treatment subset and described static storage device, for to described binaryzation face-image, calculate the number of often row black picture element, the row that the number of black picture element is more than or equal to described threshold number of pixels are designated as edge columns; Described row rim detection subset is connected respectively with described binary conversion treatment subset and described static storage device, for to described binaryzation face-image, calculate the number of often row black picture element, the row that the number of black picture element is more than or equal to described threshold number of pixels is designated as edge lines; Described Target Segmentation subset and described column border detect subset and described row rim detection subset is connected respectively, region edge columns and edge lines interweaved is as target domain of the existence, and from described binaryzation face-image, be partitioned into described target domain of the existence to export as facial subimage, the background of facial subimage from tested personnel's face-image to be separated; Described skin cluster subset is connected with described Target Segmentation subset, for facial subimage, the brightness of its all pixel to be added up and divided by the quantity of its all pixel to obtain target colour of skin average; Described colour of skin grade recognin equipment is connected respectively with described skin cluster subset and described static storage device, described target colour of skin average mated with four kinds of colour of skin mean value interval, the colour of skin grade corresponding to colour of skin mean value interval of output matching exports as target colour of skin grade;
First resistance, one end is connected with 5V power supply, and the other end is connected with the anode of infrared receiving diode;
Second resistance, one end is connected with 5V power supply, and the other end is connected with one end of the 3rd resistance;
3rd resistance, other end ground connection, and there is the resistance identical with the second resistance;
First two-way operational amplifier, for generation of the reference voltage of 2.5V, its anode is connected with the other end of the second resistance, and negative terminal is connected with one end of the first electric capacity, outfan is connected with the negative terminal of infrared-emitting diode, and negative terminal is also connected with the negative terminal of infrared-emitting diode;
First electric capacity, other end ground connection;
4th resistance, one end is connected with the negative terminal of infrared-emitting diode;
Second two-way operational amplifier, anode is connected with the other end of the 4th resistance, and negative terminal is connected with the anode of infrared receiving diode, and outfan is as pulse voltage;
5th resistance, is connected in parallel between the second two-way operational amplifier negative terminal and the second two-way operational amplifier output terminal;
Second electric capacity, is connected in parallel between the second two-way operational amplifier negative terminal and the second two-way operational amplifier output terminal;
Infrared-emitting diode, is arranged on tested personnel ear blood capillary position, and for launching infrared light, the negative terminal of infrared-emitting diode is connected with the anode of infrared receiving diode;
Infrared receiving diode, is arranged on tested personnel ear blood capillary position, is positioned at the relative position of described infrared-emitting diode, for receiving the infrared light after transmission tested personnel ear blood capillary;
Light emitting diode, is arranged on tested personnel's finger fingertip blood capillary position, is connected with light source driving circuit, for the LED control signal sent based on light source driving circuit, and alternate emission infrared light and HONGGUANG;
Light source driving circuit, built-in timer, for sending LED control signal to described light emitting diode;
Optical-electrical converter, be arranged on tested personnel's finger fingertip, be positioned at the relative position of described light emitting diode, for receiving the infrared light after transmission tested personnel finger fingertip blood capillary and HONGGUANG, and transmitted infrared light and transmit red light are converted to analog current signal respectively, to obtain simulation infrared light electric current and simulation HONGGUANG electric current;
Current-to-voltage converting circuit, is connected with described optical-electrical converter, for carrying out current/voltage conversion respectively to simulation infrared light electric current and simulation HONGGUANG electric current, to obtain simulation infrared light voltage and simulation red voltages respectively;
Signal amplifier, is connected with described current-to-voltage converting circuit, for amplifying respectively with simulation red voltages simulation infrared light voltage, amplifies voltage to obtain simulation infrared light amplification voltage and to simulate HONGGUANG;
Signal deteching circuit, be connected with described signal amplifier, comprise direct current signal and detect electronic circuit and alternating current signal detection electronic circuit, for detecting flip-flop in simulation infrared light voltage and alternating component, to export as the first DC voltage and the first alternating voltage, also for detecting flip-flop in simulation red voltages and alternating component, to export as the second DC voltage and the second alternating voltage;
Analog-digital converter, be connected with described signal deteching circuit, for carrying out analog digital conversion respectively to the first DC voltage, the first alternating voltage, the second DC voltage and the second alternating voltage, to obtain the first Digital DC voltage, the first Digital AC voltage, the second Digital DC voltage and the second Digital AC voltage;
Digital signal processor, be connected respectively with described analog-digital converter, described static storage device and described blee checkout equipment, by the ratio of the second Digital AC voltage and the second Digital DC voltage divided by the ratio of the first Digital AC voltage and the first Digital DC voltage to obtain the absorbing light ratio factor, and calculate blood oxygen saturation based on the absorbing light ratio factor, wherein, blood oxygen saturation and the absorbing light ratio factor linear; Described digital signal processor is also connected to obtain described pulse voltage with the outfan of described second two-way operational amplifier, and when described pulse voltage is outside default pulse range, sends cacosphyxia identification signal;
Wherein, described digital signal processor mates calculating the blood oxygen saturation obtained with described four kinds of blood oxygen saturation intervals, using the blood oxygen saturation grade corresponding to the blood oxygen saturation interval that the match is successful as target blood oxygen saturation grade;
Wherein, described optical-electrical converter is a photodiode;
Wherein, between described signal amplifier and described signal deteching circuit, go back signalization filter circuit, amplify the noise contribution in voltage and simulation HONGGUANG amplification voltage for filtering simulation infrared light;
Wherein, between infrared-emitting diode and infrared receiving diode during pulseless, pulse voltage is 2.5V, and when there is the pulse of beating between infrared-emitting diode and infrared receiving diode, blood vessels make ear's light transmission be deteriorated, and pulse voltage is greater than 2.5V;
Wherein, described digital signal processor is by target colour of skin grade and default colour of skin multiplied by weight, by target blood oxygen saturation grade and default blood oxygen saturation multiplied by weight, by two product addition to obtain total trade-off value, when total trade-off value is less than or equal to default balance lower threshold, send hypoxemia identification signal, when total trade-off value is more than or equal to default balance upper limit threshold, send blood oxygen excess identification signal.
3. blood oxygen supply detector as claimed in claim 2, it is characterized in that, described detector also comprises:
Bluetooth communication interface, is connected with described digital signal processor, for cacosphyxia identification signal, hypoxemia identification signal or blood oxygen excess identification signal being sent to the medical monitoring Cloud Server of far-end.
4. blood oxygen supply detector as claimed in claim 2, is characterized in that:
The wavelength of the infrared light that described light emitting diode is launched is 940nm, and the wavelength of the HONGGUANG that described light emitting diode is launched is 660nm.
5. blood oxygen supply detector as claimed in claim 2, is characterized in that:
First two-way operational amplifier and the second two-way operational amplifier are all the two-way operational amplifier of TI company.
6. blood oxygen supply detector as claimed in claim 2, is characterized in that:
Image semantic classification subset, binary conversion treatment subset, column border detect subset, row rim detection subset, Target Segmentation subset, skin cluster subset and colour of skin grade recognin equipment and adopt different fpga chips respectively to realize.
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