CN103169478A - Blood oxygen measurement device - Google Patents
Blood oxygen measurement device Download PDFInfo
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- CN103169478A CN103169478A CN2011104418751A CN201110441875A CN103169478A CN 103169478 A CN103169478 A CN 103169478A CN 2011104418751 A CN2011104418751 A CN 2011104418751A CN 201110441875 A CN201110441875 A CN 201110441875A CN 103169478 A CN103169478 A CN 103169478A
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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
Abstract
The invention discloses a blood oxygen measurement device which comprises a light emitting device, a light detecting device and a signal processing circuit, wherein the light emitting device is arranged on one side of an object to be detected and is used for emitting first wavelength light and second wavelength light, the light detecting device is arranged on the other side of the detected object relative to the light emitting device and comprises a first narrow-band light detector and a second narrow-band light detector, the first narrow-band light detector is used for receiving transmission light of the first wavelength light transmitting through the detected object and converting the transmission light into an electric signal corresponding to the first wavelength light, the second narrow-band light detector is used for receiving transmission light of the second wavelength light transmitting through the detected object and converting the transmission light into an electric signal corresponding to the second wavelength light, and the signal processing circuit is respectively coupled to an output end of the first narrow-band detector and an output end of a second narrow-band light detector and calculates oxyhemoglobin saturation. The blood oxygen measurement device effectively suppresses environment light, and meanwhile provides possibilities for improving capacities of the blood oxygen measurement device in terms of suppression of movement interference of a measured object.
Description
Technical field
The present invention relates to a kind of blood oxygen measuring device.
Background technology
Research by to the pulse blood oxygen measuring principle it is found that, as long as measure the variation of the light intensity of transillumination in a complete pulse wave of two kinds of wavelength, can measure blood oxygen saturation.At present, the ultimate principle that pulse blood oxygen is measured is: change to determine blood oxygen saturation by the light absorption aroused in interest that HONGGUANG, infrared light is projected blood capillary and property measuring period, the Lights section red-emitting in blood oxygen probe, infrared light, and corresponding photo-detector is realized the detection to HONGGUANG and infrared light.
Blood oxygen measuring method is that in hypothesis light absorption signal, all flutter components are full caused by arterial blood, and comes ratio calculated with the flutter component (AC) of the light absorption of HONGGUANG (near the wavelength 500-700 nanometer), infrared wavelength (near the wavelength of 800-1000 nanometer) than the ratio of upper DC component (DC):
Red＝Red(AC)/Red(DC)
Ir＝Ir(AC)/Ir(DC)
Further calculate again the light absorption ratio of these two light waves
R＝Red/Ir
Just can show to search corresponding blood oxygen saturation at the R-Spo2 that has set up by this R value, and this R-Spo2 table is what according to blood gas analyzer, the Results of Blood-gas of health adult's volunteer in the research of the histanoxia of bringing out determined.
As shown in Figure 1, blood oxygen measuring device mainly comprises light source 11, detector 12 and signal processing circuit 13, and light source 11 adopts HONGGUANG and two kinds of light sources of infrared light, is positioned at a side of object to be detected, and detector 12 is positioned at the opposite side of object to be detected.When carrying out Oximetry, two kinds of light sources of HONGGUANG and infrared light replace luminous and the transmission object to be detected, detector 12 detection HONGGUANG and infrared light see through the transmitted light intensity of object to be detected, and convert the transillumination of HONGGUANG and infrared light to the signal of telecommunication and export to signal processing circuit 13, signal processing circuit 13 is used for the signal that detects is processed and computing on the one hand, obtain blood oxygen saturation, during on the other hand according to the light source luminescent of design, the ordered pair light source drives, its luminous sequential is that HONGGUANG and two kinds of light sources of infrared light are alternately luminous, as shown in Figure 2.
Summary of the invention
The invention provides a kind of novel blood oxygen measuring device, can improve the accuracy of blood oxygen measuring device measurement result.
According to an aspect of the present invention, provide a kind of blood oxygen measuring device, comprising: light emitting devices, be arranged on a side of object to be detected, be used for sending at least the first wavelength light and second wave length light; Light detecting device, be arranged on the opposite side relative with light emitting devices of object to be detected, described light detecting device comprises the first narrow band light detector and the second narrow band light detector, the first narrow band light detector is used for receiving the transillumination of the first wavelength light transmission object to be detected, and be converted to the signal of telecommunication corresponding with the first wavelength light, the second narrow band light detector is used for receiving the transillumination of second wave length light transmission object to be detected, and is converted to the signal of telecommunication corresponding with second wave length light; Signal processing circuit, it is coupled to respectively the outfan of the first narrow band light detector and the second narrow band light detector, receive the signal of telecommunication corresponding with the first wavelength light and the signal of telecommunication corresponding with second wave length light, according to the signal of telecommunication corresponding with the first wavelength light and the signal of telecommunication calculating blood oxygen saturation corresponding with second wave length light; Described signal processing circuit also is coupled to light emitting devices.
According to a further aspect in the invention, provide a kind of blood oxygen measuring device, comprising: light emitting devices, be arranged on a side of object to be detected, be used for sending at least HONGGUANG and infrared light; Light detecting device, be arranged on the opposite side relative with light emitting devices of object to be detected, described light detecting device comprises HONGGUANG detector and infrared detector, the HONGGUANG detector is used for receiving the transillumination that HONGGUANG sees through object to be detected, and be converted to the signal of telecommunication corresponding with HONGGUANG, infrared detector is used for receiving the transillumination that infrared light sees through object to be detected, and is converted to the signal of telecommunication corresponding with infrared light; Signal processing circuit, it is coupled to respectively the outfan of HONGGUANG detector and infrared detector, receive the signal of telecommunication corresponding with HONGGUANG and the signal of telecommunication corresponding with infrared light, according to the signal of telecommunication corresponding with HONGGUANG and the signal of telecommunication calculating blood oxygen saturation corresponding with infrared light.
According to a further aspect in the invention, a kind of blood oxygen measuring device is provided, comprise: light emitting devices, be arranged on a side of object to be detected, described light emitting devices comprises be used to the first luminescent device that sends the first wavelength light and is used for sending the second luminescent device of second wave length light, and the fluorescent lifetime that described the first luminescent device and the second luminescent device are configured to both has the delay inequality of setting; Light detecting device, be arranged on the opposite side relative with light emitting devices of object to be detected, described light detecting device comprises the first photo-detector and the second photo-detector, the first photo-detector is for detection of the transillumination of the first wavelength light transmission object to be detected, and be converted to the signal of telecommunication corresponding with the first wavelength light, the second photo-detector is for detection of the transillumination of second wave length light transmission object to be detected, and being converted to the signal of telecommunication corresponding with second wave length light, in the first photo-detector and the second photo-detector, at least one is the narrow band light detector; Signal processing circuit, it is coupled to respectively the outfan of the first photo-detector and the second photo-detector, receives the signal of the first photo-detector and the second photo-detector output and calculates blood oxygen saturation.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of blood oxygen measuring device;
Fig. 2 is the sequential chart of a kind of embodiment of blood oxygen measuring device;
Fig. 3 is the structural representation of blood oxygen measuring device in embodiment one;
Fig. 4 is the sequential chart of blood oxygen measuring device in embodiment one;
Fig. 5 is the structural representation of two kinds of blood oxygen measuring devices of embodiment;
Fig. 6 is the sequential chart of blood oxygen measuring device in embodiment two;
Fig. 7 is the structural representation of blood oxygen measuring device in embodiment three;
Fig. 8 is the structural representation of blood oxygen measuring device in embodiment four;
Fig. 9 is the sequential chart of blood oxygen measuring device in embodiment four;
Figure 10 is the structural representation of blood oxygen measuring device in embodiment five;
Figure 11 is the sequential chart of blood oxygen measuring device in embodiment five.
The specific embodiment
By reference to the accompanying drawings the present invention is described in further detail below by the specific embodiment.
In a kind of embodiment of the application, blood oxygen measuring device adopts at least a narrow band light detector, detecting respectively the transmitted light intensity of two kinds of wavelength that see through testee, and calculates blood oxygen saturation based on the transmitted light intensity of two kinds of wavelength.The narrow band light detector only detects the light of a certain particular range of wavelengths, and the light outside the passband wave-length coverage is produced obviously decay, therefore can make the narrow band light detector only pass through the transillumination of calculative two kinds of wavelength by the optical filtering parameter of selecting two kinds of narrow band light detectors, and the transillumination of filtering environmental light and other wavelength, thereby reduce the impact of surround lighting and other wavelength light, improve the accuracy of blood oxygen measuring device measurement result.
In actual applications, the light that light source sends comprises the first wavelength light and two kinds of wavelength of second wave length light at least, and light source can send respectively the first wavelength light and second wave length light, also can send the wide spectrum optical that includes the first wavelength light and second wave length light.When oximeter was calculated, the transmitted light intensity of only choosing two kinds of predetermined wavelength participated in calculating, for example, and the first wavelength light and second wave length light.In theory, the first wavelength light and second wave length light can be for being fit to arbitrarily two kinds of light by object to be detected and the different wave length that can be detected in the light-receiving side.In following examples, (for example finger), the first wavelength light and second wave length light are respectively HONGGUANG and infrared light and describe as example take object to be detected as tissue.
In the another kind of embodiment of the application, blood oxygen measuring device adopts the drive scheme of modulated light source, make light source have according to setting-up time interval emission the high-frequency pulse light of setting width, the high-frequency impulse light frequency is far above common surround lighting, ambient light interference is presented as out-of-band noise, filtering easily, thus the impact of surround lighting also can be reduced.
Embodiment one:
Please refer to Fig. 3, blood oxygen measuring device comprises light emitting devices 21, light detecting device 22 and signal processing circuit 23.light emitting devices 21 is arranged on a side of tissue, light emitting devices 21 comprises light source driving circuit 211, the first luminescent device 212 and the second luminescent device 213, in the present embodiment, the first luminescent device 212 is the red light-emitting device of red-emitting, the second luminescent device 213 is the infrared light luminescent device of emission infrared light, the first luminescent device 212 and the second luminescent device 213 can be respectively specifically red light-emitting diode and infrared light light emitting diode, red light-emitting diode and infrared light light emitting diode are connected in parallel on light source driving circuit 211 two ends in the same way, drive simultaneously luminous by light source driving circuit 211.light detecting device 22 is arranged on the opposite side relative with light emitting devices 21 of tissue, light detecting device 22 comprises the first narrow band light detector 221 and the second narrow band light detector 222, when the first luminescent device 212 and the second luminescent device 213 difference red-emittings and infrared light, the first narrow band light detector 221 and the second narrow band light detector 222 correspondences be HONGGUANG detector and infrared detector, the HONGGUANG detector is used for receiving the transillumination that HONGGUANG sees through tissue, and be converted to the signal of telecommunication corresponding with HONGGUANG, infrared detector is used for receiving the transillumination that infrared light sees through tissue, and be converted to the signal of telecommunication corresponding with infrared light.When the first narrow band light detector 221 and the second narrow band light detector 222 can adopt existing narrow band light detector, or adopt the narrow band light detector that filtering parameter requires that meets that prior art is made into, for example adopt photodiode with optical filter to detect transmitted light intensity through the specific wavelength of light of tissue, when the first narrow band light detector 221 and the second narrow band light detector 222 were respectively HONGGUANG detector and infrared detector, it can be set as 660nm and 940nm by wavelength.Certainly, content disclosed according to the application and prior art, art technology should be appreciated that the optical wavelength that the first narrow band light detector 221 and the second narrow band light detector 222 detect can also be the wavelength of other setting.Signal processing circuit 23 is coupled to respectively the outfan of the first narrow band light detector 221 and the second narrow band light detector 222, receive the signal of telecommunication corresponding with HONGGUANG and the signal of telecommunication corresponding with infrared light, according to the signal of telecommunication corresponding with HONGGUANG and the signal of telecommunication calculating blood oxygen saturation corresponding with infrared light.In one instantiation, signal processing circuit 23 comprises signal amplification/modulate circuit 231, analog to digital conversion circuit 232 and the processor 233 that is linked in sequence.Signal amplification/modulate circuit 231 respectively with the first narrow band light detector 221 be connected the outfan of narrow band light detector 222 and be connected, receive the first narrow band light detector 221 and the signal of telecommunication corresponding with HONGGUANG of the second narrow band light detector 222 outputs and the signal of telecommunication corresponding with infrared light, the signal of telecommunication is amplified and other processing (other processes for example filtering), signal after analog to digital conversion circuit 232 will amplify carries out analog digital conversion, then output to processor 233, processor 233 is according to the calculated signals blood oxygen saturation after analog to digital conversion.The algorithm that the computational methods of blood oxygen saturation can adopt existing algorithm or may occur in the future.
In actual applications, may have surround lighting in the residing testing environment of blood oxygen measuring device, and surround lighting there is flip-flop that alternating component is also arranged, if be superimposed upon on the light of light emitting devices emission, easily produce on transillumination and disturb, disturb measuring to produce.In the present embodiment, the first narrow band light detector only detects the HONGGUANG transillumination through tissue, the second narrow band light detector only detects the infrared transmission light through tissue, but the therefore light of other wavelength in filtering environmental light and light source reduces the interference of surround lighting and other wavelength light.
In the present embodiment, adopt respectively two kinds of narrow band light detectors to detect the transmitted light intensity of two kinds of optical signals in addition, provide possibility for two kinds of light transmit and receive simultaneously.For example, light source drive signal to the first luminescent device 212 and the second luminescent device 213 can be as shown in Figure 4, one to have the pulse signal of setting cycle, this light source drive signal drives the first luminescent device 212 and the second luminescent device 213 sends HONGGUANG and infrared light simultaneously, the first narrow band light detector 221 and the second narrow band light detector 222 detect HONGGUANG transillumination and the infrared transmission light that sees through tissue respectively, and the HONGGUANG transillumination that detects and infrared transmission optical signal are synchronizing signal.Therefore this scheme has improved the synchronicity of detection signal, the processing of convenient follow-up blood oxygen algorithm.When causing the pulse blood flow to change due to the detected material motion, also can cause between HONGGUANG transillumination and infrared transmission optical signal life period poor, the time difference that follow-up blood oxygen algorithm is difficult between identification two signals is that the asynchronism of signal own is that cause or motion detected material causes, when improving the synchronicity of HONGGUANG and the detection signal of infrared light own, also identify more accurately the interference that is caused by the testee motion and carry out effectively suppressing to provide possibility for follow-up blood oxygen algorithm.
Light source drive signal can be by light source driving circuit 211 according to the timing sequence generating of setting, also can be by the processor 233 in signal processing circuit 23 according to the timing sequence generating of setting, processor 233 exports light source drive signal to the light source driving circuit 211 of light emitting devices 21, and is luminous according to light source drive signal driving the first luminescent device 212 and the second luminescent device 213 by light source driving circuit 211.
In above-described embodiment, the first luminescent device 212 and the second luminescent device 213 are connected in parallel on light source driving circuit 211 two ends in the same way, in other instantiation, each luminescent device also can have independently light source driving circuit, be the two ends that each luminescent device is connected to light source driving circuit separately, by the light source driving circuit driven for emitting lights.in this case, the first luminescent device 212 and the second luminescent device 213 can be not luminous simultaneously yet, but has the delay inequality of setting, for example the light source driving circuit of the first luminescent device carries out light source drive signal the time-delay of certain hour by on-off circuit or delay circuit, and the light source driving circuit of the second luminescent device is not delayed time to light source drive signal, thereby the optical retardation certain hour that light ratio the second luminescent device that the first luminescent device sends is sent, and two kinds of transilluminations that the first narrow band light detector and the second narrow band light detector detect also have the regular hour poor.
Embodiment two:
Please refer to Fig. 5, blood oxygen measuring device comprises light emitting devices 31, light detecting device 32 and signal processing circuit 33.Light emitting devices 31 is arranged on a side of tissue, light detecting device 32 is arranged on the opposite side relative with light emitting devices 31 of tissue, light detecting device 32 comprises the first narrow band light detector 321 and the second narrow band light detector 322, the first narrow band light detector 321 sees through the transmitted light intensity of tissue for detection of HONGGUANG, the second narrow band light detector 322 sees through the transmitted light intensity of tissue for detection of infrared light.Signal processing circuit 33 is coupled to respectively the outfan of the first narrow band light detector 321 and the second narrow band light detector 322, receive the signal of telecommunication corresponding with the first wavelength light and the signal of telecommunication corresponding with second wave length light, according to the signal of telecommunication corresponding with the first wavelength light and the signal of telecommunication calculating blood oxygen saturation corresponding with second wave length light.In the present embodiment, light emitting devices 31 is a broad spectrum light source, comprises at least red-light spectrum and infrared spectrum in the spectrum of its emission.Certainly, those skilled in the art should understand that, if what oximeter was calculated employing is the light of other two kinds of wavelength, the light that should comprise at least two kinds of wavelength that the oximeter calculation is adopted in the spectrum of broad spectrum light source emission, and the transmitted light intensity that also detects these two kinds of wavelength of the first narrow band light detector 321 and the second narrow band light detector 322 correspondences.In the present embodiment, light emitting devices 31 comprises light source driving circuit 311 and broad spectrum light source 312, and broad spectrum light source 312 is connected to the two ends of light source driving circuit 311, by light source driving circuit 311 according to the light source drive signal driven for emitting lights.Broad spectrum light source 312 can adopt existing broad spectrum light source or in the future emerging broad spectrum light source, for example white light LEDs or incandescent lamp ﹠ lantern light source.The structure of the first narrow band light detector 321, the second narrow band light detector 322 and signal processing circuit 33 can with embodiment one in identical or different.322 of the first narrow band light detector 321 and the second narrow band light detectors are responsive to infrared band or red spectral band, are respectively used to detect infrared and the HONGGUANG transillumination.The sequential of the luminous and reception light of the present embodiment as shown in Figure 6, when this broad spectrum light source was luminous, two detectors can detect the optical signal transmissive of HONGGUANG and infrared light simultaneously, can guarantee high synchronicity, also reduce simultaneously the restriction to light source, reduced the light source cost.
Embodiment three:
Please refer to Fig. 7, blood oxygen measuring device comprises light emitting devices 41, light detecting device 42 and signal processing circuit 43.Light emitting devices 41 is arranged on a side of tissue, light detecting device 42 is arranged on the opposite side relative with light emitting devices 41 of tissue, light detecting device 42 comprises the first narrow band light detector and the second narrow band light detector, the first narrow band light detector sees through the transmitted light intensity of tissue for detection of HONGGUANG, the second narrow band light detector sees through the transmitted light intensity of tissue for detection of infrared light.The first narrow band light detector comprises a plurality of HONGGUANG detectors, the second narrow band light detector comprises a plurality of infrared detectors, HONGGUANG detector and infrared detector can be arranged on light detecting device 42 according to the design needs in many ways, as shown in Figure 7, be distributed on light detecting device 42 in the space mode or by the row interval mode.
In the present embodiment, a plurality of detectors spatially evenly distribute, and can guarantee that like this light path of two kinds of light sources is more consistent.Further, these detectors can pass through semiconductor technology, are arranged into array, are produced on a chip, make the single area of these detectors less, and number is more, and it is more even to distribute.
In the present embodiment, the structure of light emitting devices 41 and signal processing circuit 43 can be identical or different with embodiment one.Light emitting devices 41 can be two light sources independently, sends respectively HONGGUANG and infrared light, can be also a broad spectrum light source.
Embodiment four:
Environment light source such as electric filament lamp, fluorescent lamp, its light intensity have comprised flip-flop (being light intensity substantially constant, not temporal evolution) usually, and the alternation composition, are generally the frequency multiplication composition of power frequency (50Hz or 60Hz).They are superimposed upon on the light that light source sends, and easily disturb the detection of transillumination, thereby affect Oximetry.Therefore Background suppression light disturbs in the following ways: light source is with the high-frequency pulse light of regular hour every the output certain width, the frequency requirement of this high-frequency pulse light is apparently higher than the luminous interval of light source, and is convenient to detect and process by blood oxygen measuring device get final product.
Between the higher frequency light emission period of light source, can realize by the on-off control of light source driving circuit or the variation of drive current.This high-frequency pulse waveform can be square wave, can be also the sinusoidal wave high frequency waveshape that waits.After measuring device detects this high-frequency pulse transillumination, this high-frequency pulse transmitted light intensity is processed, and be used for blood oxygen levels calculating.Owing to having adopted the high-frequency impulse optical drive, ambient light interference is presented as out-of-band noise, filtering easily, and obtain corresponding transmitted light intensity.
In the present embodiment, please refer to Fig. 8, blood oxygen measuring device comprises light emitting devices 51, light detecting device 52 and signal processing circuit 53.Light emitting devices 51 is arranged on a side of tissue, and light detecting device 52 is arranged on the opposite side relative with light emitting devices 51 of tissue, is used for receiving the transillumination that sees through object to be detected of specific two kinds of wavelength.light emitting devices has according to setting-up time interval emission the high-frequency pulse light of setting width, as shown in Figure 9, light source drive signal is a high-frequency modulation signal, its modulating signal source is the pulse signal of a low frequency, as shown in (a) in Fig. 9, the modulating signal source of this low frequency can be the common light source drive signal of light emitting devices, adopt the modulating signal source of this low frequency that one frequency is modulated far above the high-frequency signal of modulation signal source frequency, the modulated light source drive signal that generates is as shown in (b) in Fig. 9, this modulated signal is driven light emitting devices 51 as light source drive signal luminous.The light source 512 that comprises light source driving circuit 511 and wide spectrum take light emitting devices 51 is as example, and light emitting devices 51 as shown in (b) in Fig. 9, wherein comprises HONGGUANG and infrared light in the sequential of the light that sends under the driving of modulated light source drive signal.Light detecting device 52 comprises the first narrow band light detector 521 and the second narrow band light detector 522, the first narrow band light detector 521 sees through the transmitted light intensity of tissue for detection of HONGGUANG, the second narrow band light detector 522 sees through the transmitted light intensity of tissue for detection of infrared light.The sequential of the HONGGUANG that the first narrow band light detector 521 and the second narrow band light detector 522 detect and the transillumination of infrared light as (c) in Fig. 9 with (d), is the high-frequency modulation signal identical with light source drive signal respectively.signal processing circuit 53 comprises the signal amplification/modulate circuit 531 that is linked in sequence, detecting circuit 532, analog to digital conversion circuit 533 and processor 534, the input of described signal amplification/modulate circuit 531 is connected with light detecting device 52, receive the high frequency modulated signal of telecommunication of light detecting device 52 outputs, the high frequency modulated signal of telecommunication is amplified and Filtering Processing, and the high frequency modulated signal of telecommunication is outputed to detecting circuit 532, 532 pairs of high frequency modulated signals of telecommunication of described detecting circuit carry out the detection demodulation, the signal of telecommunication after 533 pairs of detections of analog to digital conversion circuit carries out analog to digital conversion, described processor 534 is according to the calculated signals blood oxygen saturation after analog to digital conversion.
In other instantiation, light emitting devices 51 also can comprise two light sources that independently send HONGGUANG and infrared light, light source driving circuit 511 is simultaneously luminous according to two light sources of modulated light source drive, the first narrow band light detector 521 and the second narrow band light detector 522 detect the transillumination of HONGGUANG and infrared light, and the transillumination sequential of the HONGGUANG that it detects and infrared light is as (c) in Fig. 9 with (d).
Embodiment five:
In the present embodiment, light emitting devices is still luminous with certain frequency, carries out luminously between the light emission period of this light emitting devices with higher frequency, after detector detects this transillumination, carries out detection for this frequency, detects transmitted light intensity.Still adopt modulated light source drive signal, please refer to Figure 10, blood oxygen measuring device comprises light emitting devices 61, light detecting device 62 and signal processing circuit 63.Light emitting devices 61 is arranged on a side of tissue, and light detecting device 62 is arranged on the opposite side relative with light emitting devices 61 of tissue, is used for receiving the transillumination that sees through object to be detected of specific two kinds of wavelength.light emitting devices 61 comprises light source driving circuit 611, the first luminescent device 612 and the second luminescent device 613, the first luminescent device 612 is the red light-emitting device of red-emitting, the second luminescent device 613 is the infrared light luminescent device of emission infrared light, the first luminescent device 612 and the second luminescent device 613 are connected in reverse parallel in the two ends of light source driving circuit 611, light source driving circuit 611 is alternately luminous according to modulated light source drive the first luminescent device 612 and the second luminescent device 613, the sequential of the light that the first luminescent device 612 and the second luminescent device 613 send is as (a) in Figure 11 with (b), light detecting device 62 is wide spectral detector, the sequential of the HONGGUANG that it detects and the transillumination of infrared light is as shown in (c) in Figure 11.signal processing circuit 53 comprises the signal amplification/modulate circuit 531 that is linked in sequence, detecting circuit 532, analog to digital conversion circuit 533 and processor 534, the input of described signal amplification/modulate circuit 531 is connected with light detecting device 52, receive the high frequency modulated signal of telecommunication of light detecting device 52 outputs, the high frequency modulated signal of telecommunication is amplified and Filtering Processing, and the high frequency modulated signal of telecommunication is outputed to detecting circuit 532, 532 pairs of high frequency modulated signals of telecommunication of described detecting circuit carry out the detection demodulation, the signal of telecommunication after 533 pairs of detections of analog to digital conversion circuit carries out analog to digital conversion, described processor 534 is according to the calculated signals blood oxygen saturation after analog to digital conversion.
In above-described embodiment four and five, modulated light source drive signal can be by light source driving circuit according to the timing sequence generating of setting, also can be by the processor in signal processing circuit according to the timing sequence generating of setting, processor exports light source drive signal to the light source driving circuit of light emitting devices, by light source driving circuit according to modulated light source drive light source luminescent.Modulated light source drive signal can be voltage driven type, can be also current drive-type, and light source driving circuit can carry out different circuit design according to the driving type difference of modulated light source drive signal.
In a further embodiment, when light emitting devices comprises the first luminescent device that is respectively used to send the first wavelength light and is used for sending the second luminescent device of second wave length light, adjust light source drive signal, make the fluorescent lifetime of the first luminescent device and the second luminescent device have the delay inequality of setting, for example light emitting devices comprises the red light-emitting device of red-emitting and the infrared light luminescent device of emission infrared light, light source drive signal drives between signal and infrared light driving signal HONGGUANG and has a time-delay as shown in Figure 2.Light detecting device also comprises the first photo-detector and the second photo-detector in this case, the first photo-detector is for detection of the transillumination of the first wavelength light transmission object to be detected, and be converted to the signal of telecommunication corresponding with the first wavelength light, the second photo-detector is for detection of the transillumination of second wave length light transmission object to be detected, and be converted to the signal of telecommunication corresponding with second wave length light, and in the first photo-detector and the second photo-detector, at least one is the narrow band light detector.Take the first wavelength light as HONGGUANG, second wave length light is example as infrared light, for example in an instantiation, the first photo-detector is that the passband wavelength is the narrow band light detector of red light wavelength, can detect the transillumination that HONGGUANG sees through object to be detected, the second photo-detector is wide spectral detector, the transillumination of HONGGUANG and two kinds of light transmission objects to be detected of infrared light can be detected, because HONGGUANG and infrared light have a timing difference on luminous sequential, according to luminous sequential, can detect the transmitted light intensity signal that infrared light sees through object to be detected.Certainly, content disclosed according to the application, those skilled in the art should understand that the first photo-detector can be also that the passband wavelength is the narrow band light detector of infrared light wavelength, and the second photo-detector is wide spectral detector, according to luminous sequential, can detect the transmitted light intensity signal that HONGGUANG sees through object to be detected.In addition, the first photo-detector and the second photo-detector can be all also the narrow band light detectors, and one of them is that the passband wavelength is the narrow band light detector of red light wavelength, and another is that the passband wavelength is the narrow band light detector of infrared light wavelength.
Signal processing circuit is coupled to respectively the outfan of the first photo-detector and the second photo-detector, receives the signal of the first photo-detector and the second photo-detector output and calculates blood oxygen saturation.
Above content is in conjunction with concrete embodiment further description made for the present invention, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (11)
1. blood oxygen measuring device is characterized in that comprising:
Light emitting devices is arranged on a side of object to be detected, is used for sending at least the first wavelength light and second wave length light;
Light detecting device, be arranged on the opposite side relative with light emitting devices of object to be detected, described light detecting device comprises the first narrow band light detector and the second narrow band light detector, the first narrow band light detector is used for receiving the transillumination of the first wavelength light transmission object to be detected, and be converted to the signal of telecommunication corresponding with the first wavelength light, the second narrow band light detector is used for receiving the transillumination of second wave length light transmission object to be detected, and is converted to the signal of telecommunication corresponding with second wave length light;
Signal processing circuit, it is coupled to respectively the outfan of the first narrow band light detector and the second narrow band light detector, receive the signal of telecommunication corresponding with the first wavelength light and the signal of telecommunication corresponding with second wave length light, according to the signal of telecommunication corresponding with the first wavelength light and the signal of telecommunication calculating blood oxygen saturation corresponding with second wave length light; Described signal processing circuit also is coupled to light emitting devices.
2. blood oxygen measuring device as claimed in claim 1, it is characterized in that, described light emitting devices comprises be used to the first luminescent device that sends the first wavelength light and is used for sending the second luminescent device of second wave length light, and described the first luminescent device and the second luminescent device are configured to have based on light source drive signal synchronous light-emitting or fluorescent lifetime the delay inequality of setting.
3. blood oxygen measuring device is characterized in that comprising:
Light emitting devices is arranged on a side of object to be detected, is used for sending at least HONGGUANG and infrared light;
Light detecting device, be arranged on the opposite side relative with light emitting devices of object to be detected, described light detecting device comprises HONGGUANG detector and infrared detector, the HONGGUANG detector sees through the transillumination of object to be detected for detection of HONGGUANG, infrared detector sees through the transillumination of object to be detected for detection of infrared light;
Signal processing circuit, it is coupled to respectively the outfan of HONGGUANG detector and infrared detector, receive the signal of telecommunication corresponding with HONGGUANG and the signal of telecommunication corresponding with infrared light, according to the signal of telecommunication corresponding with HONGGUANG and the signal of telecommunication calculating blood oxygen saturation corresponding with infrared light.
4. blood oxygen measuring device as claimed in claim 3, is characterized in that, described signal processing circuit also is coupled to light emitting devices, drives signal to the light emitting devices output light source, drives light emitting devices luminous.
5. blood oxygen measuring device as claimed in claim 3, is characterized in that, described HONGGUANG detector has a plurality of, and infrared detector has a plurality of.
6. blood oxygen measuring device as claimed in claim 5, is characterized in that, a plurality of HONGGUANG detectors and infrared detector are integrated on a chip.
7. blood oxygen measuring device as described in any one in claim 3-6, it is characterized in that, described light emitting devices comprises red light-emitting device and infrared light luminescent device, and described red light-emitting device and infrared light luminescent device are configured the delay inequality that has setting for synchronous light-emitting or fluorescent lifetime.
8. blood oxygen measuring device as described in any one in claim 1 or 3-6, is characterized in that, described light emitting devices is a broad spectrum light source.
9. blood oxygen measuring device is characterized in that comprising:
Light emitting devices, be arranged on a side of object to be detected, described light emitting devices comprises be used to the first luminescent device that sends the first wavelength light and is used for sending the second luminescent device of second wave length light, and the fluorescent lifetime that described the first luminescent device and the second luminescent device are configured to both has the delay inequality of setting;
Light detecting device, be arranged on the opposite side relative with light emitting devices of object to be detected, described light detecting device comprises the first photo-detector and the second photo-detector, the first photo-detector is for detection of the transillumination of the first wavelength light transmission object to be detected, and be converted to the signal of telecommunication corresponding with the first wavelength light, the second photo-detector is for detection of the transillumination of second wave length light transmission object to be detected, and being converted to the signal of telecommunication corresponding with second wave length light, in the first photo-detector and the second photo-detector, at least one is the narrow band light detector;
Signal processing circuit, it is coupled to respectively the outfan of the first photo-detector and the second photo-detector, receives the signal of the first photo-detector and the second photo-detector output and calculates blood oxygen saturation.
10. blood oxygen measuring device as claimed in any one of claims 1-9 wherein, is characterized in that, described light emitting devices has according to setting-up time interval emission the high-frequency pulse light of setting width.
11. blood oxygen measuring device as claimed in claim 10, it is characterized in that, described signal processing circuit comprises the signal amplification/modulate circuit that is linked in sequence, detecting circuit, analog to digital conversion circuit and processor, the input of described signal amplification/modulate circuit is connected with light detecting device, receive the high frequency modulated signal of telecommunication of light detecting device output, the high frequency modulated signal of telecommunication is amplified and Filtering Processing, and the high frequency modulated signal of telecommunication is outputed to detecting circuit, described detecting circuit carries out the detection demodulation to the high frequency modulated signal of telecommunication, the signal of telecommunication of analog to digital conversion circuit after to detection carries out analog to digital conversion, the calculated signals blood oxygen saturation of described processor after according to analog to digital conversion, described processor also is coupled to light emitting devices, output through the modulated light source drive signal of high frequency modulated to light emitting devices.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011104418751A CN103169478A (en) | 2011-12-26 | 2011-12-26 | Blood oxygen measurement device |
| PCT/CN2012/086345 WO2013097599A1 (en) | 2011-12-26 | 2012-12-11 | Blood oxygen measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104418751A CN103169478A (en) | 2011-12-26 | 2011-12-26 | Blood oxygen measurement device |
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| CN103169478A true CN103169478A (en) | 2013-06-26 |
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| CN2011104418751A Pending CN103169478A (en) | 2011-12-26 | 2011-12-26 | Blood oxygen measurement device |
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| WO (1) | WO2013097599A1 (en) |
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