CN213097886U - Blood oxygen saturation detection circuit - Google Patents
Blood oxygen saturation detection circuit Download PDFInfo
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- CN213097886U CN213097886U CN202021559062.3U CN202021559062U CN213097886U CN 213097886 U CN213097886 U CN 213097886U CN 202021559062 U CN202021559062 U CN 202021559062U CN 213097886 U CN213097886 U CN 213097886U
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Abstract
A circuit for detecting blood oxygen saturation comprises an optical signal transmitting unit, an optical signal receiving and converting unit, an amplitude adjusting and analog-to-digital converting unit and a control unit, wherein the optical signal transmitting unit is connected with the control unit, receives the control of the control unit and transmits an optical signal; the optical signal receiving and converting unit is used for converting the received optical signal into an electric signal and then sending the electric signal to the amplitude adjusting and analog-to-digital converting unit; the amplitude adjusting and analog-to-digital converting unit receives the electric signal from the optical signal receiving and converting unit to adjust the amplitude, is controlled by the control unit, converts the electric signal into a digital signal and sends the digital signal to the control unit; and the control unit processes the digital signal to acquire the hemoglobin concentration and the blood oxygen saturation. The utility model discloses an oxyhemoglobin saturation detection circuitry has improved the detection precision of having no oxyhemoglobin saturation to and interference immunity.
Description
Technical Field
The utility model relates to an electronic circuit technical field, in particular to improve oxyhemoglobin saturation's detection precision circuit.
Background
The blood oxygen saturation (SaO2) is the percentage of the volume of oxygenated hemoglobin bound by oxygen (HbO2) in the blood to the volume of total bindable hemoglobin (Hb), i.e. the concentration of blood oxygen in the blood, which is an important physiological parameter of the respiratory cycle. Therefore, the detection precision of the blood oxygen saturation is improved, and the method is very important for monitoring the health of the patient.
At present, the blood oxygen saturation can realize noninvasive detection, the measurement range is 70-100%, the precision is about +/-2%, and the requirement on the health detection of patients can not be met.
SUMMERY OF THE UTILITY MODEL
In order to solve the deficiencies in the prior art, the utility model aims to provide an oxyhemoglobin saturation detection circuit can improve the detection precision of having no oxyhemoglobin saturation, and interference immunity is stronger.
In order to achieve the above object, the present invention provides a circuit for detecting blood oxygen saturation, comprising a light signal emitting unit, a light signal receiving and converting unit, an amplitude adjusting and analog-to-digital converting unit, and a control unit, wherein,
the optical signal transmitting unit is connected with the control unit, receives the control of the control unit and transmits an optical signal;
the optical signal receiving and converting unit is used for converting the received optical signal into an electric signal and then sending the electric signal to the amplitude adjusting and analog-to-digital converting unit;
the amplitude adjusting and analog-to-digital converting unit receives the electric signal from the optical signal receiving and converting unit to adjust the amplitude, is controlled by the control unit, converts the electric signal into a digital signal and sends the digital signal to the control unit;
and the control unit processes the digital signal to acquire the hemoglobin concentration and the blood oxygen saturation.
Furthermore, the optical signal transmitting unit further comprises an LED constant current source driving circuit and an adjustable current band optical signal transmitting circuit.
Furthermore, the adjustable current waveband optical signal transmitting circuit is an adjustable current 2 waveband optical signal transmitting circuit or an adjustable current 4 waveband optical signal transmitting circuit.
Further, the wavelength band length of the adjustable current 2-waveband optical signal transmitting circuit is respectively as follows: 660nm and 940 nm; the adjustable current 4-waveband optical signal transmitting circuit has the following waveband lengths: 660nm, 730nm, 805nm and 940 nm.
Furthermore, the optical signal receiving and converting unit further comprises a photodiode and a current-voltage converting circuit; the photodiode converts received ambient light and transmitted light passing through the finger into a current signal, and the current signal is converted into a voltage signal through a current-voltage conversion circuit and then output.
Furthermore, the optical signal transmitting unit adopts a chip with the model number of FP-3535RIR-B3C-F1 GKN;
the optical signal receiving and converting unit adopts an OPT101P-J photoelectric sensor chip;
the amplitude adjusting and analog-to-digital converting unit adopts a digital-to-analog converting chip with the model number of AD7124-8 BCPZ;
the control unit adopts a microprocessor chip with the model number of STM32L496RGT 6.
The utility model discloses an oxyhemoglobin saturation detection circuitry has following beneficial effect: the 4-waveband transmission light signal is driven to be acquired and processed in an adjustable current mode, so that the range of measuring personnel is wider, the measured data is more ideal, the detection precision of the noninvasive blood oxygen saturation is improved to +/-1%, and the health of a patient is effectively monitored; the utility model discloses an oxyhemoglobin saturation detection circuitry with the help of the analytic processing to ambient light and wave band LED transmitted light, realizes the noninvasive detection of hemoglobin concentration, has greatly alleviateed patient's pain, has monitored the patient health effectively
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic block diagram of a circuit for detecting blood oxygen saturation according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
Fig. 1 is a schematic block diagram of a circuit for detecting blood oxygen saturation according to the present invention, as shown in fig. 1, the circuit for detecting blood oxygen saturation of the present invention comprises a light signal emitting unit 10, a light signal receiving and converting unit 20, an amplitude adjusting and analog-to-digital converting unit 30, and a control unit 40, wherein,
and an optical signal transmitting unit 10, connected to the control unit 40, for receiving the control of the control unit 40 and transmitting an optical signal.
In this embodiment, the optical signal emitting unit 10 includes an LED constant current source driving circuit and an adjustable current band optical signal emitting circuit, where the adjustable current band optical signal emitting circuit adopts an adjustable current 2 band optical signal emitting circuit or an adjustable current 4 band optical signal emitting circuit.
In this embodiment, the optical signal emitting unit 10 is a chip with model number FP-3535RIR-B3C-F1 GKN.
And an optical signal receiving and converting unit 20, connected to the amplitude adjusting and analog-to-digital converting unit 30, for receiving an external optical signal, converting the optical signal into an electrical signal, and sending the electrical signal to the amplitude adjusting and analog-to-digital converting unit 30.
In this embodiment, the optical signal receiving and converting unit 20 includes a photodiode and a current-voltage converting circuit, and converts the ambient light when the received optical signal transmitting unit 10 is turned off and the transmitted light passing through the finger in the working condition into a current signal through the photodiode; then the current signal is converted into a voltage signal by a current-voltage conversion circuit and output.
In this embodiment, the optical signal receiving and converting unit 20 uses an OPT101 photosensor chip, and a photodiode and a signal amplifying circuit are integrated therein, so that the optical signal receiving and converting unit has high linearity and a wide frequency band.
And the amplitude adjusting and analog-to-digital converting unit 30 is respectively connected with the optical signal receiving and converting unit 20 and the control unit 40, performs amplitude adjustment on the voltage signal from the optical signal receiving and converting unit 20, is controlled by the control unit 40, performs analog-to-digital conversion on the voltage signal, and then sends a digital signal to the control unit 40.
In this embodiment, the amplitude adjusting and analog-to-digital converting unit 30 adopts a digital-to-analog converting chip with model number AD7124, which integrates an 8-channel, low-noise, low-power consumption 24-bit sigma-delta type digital-to-analog converter of PGA and a reference voltage source.
The control unit 40 is respectively connected with the optical signal transmitting unit 10 and the amplitude adjusting and analog-to-digital converting unit 30; it receives the digital signal sent by the amplitude adjustment and analog-to-digital conversion unit 30, processes the digital signal to obtain the hemoglobin concentration and the blood oxygen saturation degree, and outputs the hemoglobin concentration and the blood oxygen saturation degree; the operating state of the optical signal transmitting unit 10 is controlled (the optical signal is transmitted or turned off).
In this embodiment, the control unit 40 is a microprocessor chip of model STM32L496RGT 6.
The oxyhemoglobin saturation detection circuit of the utility model has the following working principle,
the control unit 40 sends a signal to the optical signal transmitting unit 10, and the optical signal transmitting unit 10 transmits an optical signal; the optical signal receiving and converting unit 20 receives the ambient light when the optical signal transmitting unit 10 is turned off and the transmitted light passing through the finger in the working condition, and converts the optical signal into a voltage signal; the amplitude adjusting and analog-to-digital converting unit 30 periodically collects the voltage signal from the optical signal receiving and converting unit 20 under the control of the control unit 40, then amplifies the electrical signal, and simultaneously converts the analog voltage signal into a digital signal; the control unit 40 performs processing based on the received digital signal to acquire the hemoglobin concentration and the blood oxygen saturation level.
The utility model discloses an oxyhemoglobin saturation detection circuitry compares with traditional oxyhemoglobin saturation detection circuitry, the utility model discloses optical signal directly carries out analog-to-digital conversion after photoelectric conversion, and data is more accurate, and interference immunity is stronger. Through experimental, the utility model provides a detection circuitry will not have the detection precision of wound oxyhemoglobin saturation and improved to 1%. Meanwhile, adopt the utility model provides a detection circuitry with the help of the analysis and processing to ambient light and transmitted light, can also realize the noninvasive detection of hemoglobin concentration, and this is vital to alleviating patient's pain, monitoring patient health.
In this embodiment, the blood oxygen saturation (SpO2) is the percentage of the volume of oxygenated hemoglobin (HbO2) bound by oxygen in blood to the total volume of hemoglobin (Hb), i.e., the concentration of blood oxygen in blood, which is an important physiological parameter of the respiratory cycle. During measurement, the finger is used as a transparent container for containing hemoglobin on the human finger, and the light transmission intensity passing through the tissue bed is measured to obtain the concentration of the hemoglobin and the oxygen saturation degree.
Those of ordinary skill in the art will understand that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A blood oxygen saturation detection circuit is characterized by comprising an optical signal transmitting unit, an optical signal receiving and converting unit, an amplitude adjusting and analog-to-digital converting unit and a control unit, wherein,
the optical signal transmitting unit is connected with the control unit, receives the control of the control unit and transmits an optical signal;
the optical signal receiving and converting unit is used for converting the received optical signal into an electric signal and then sending the electric signal to the amplitude adjusting and analog-to-digital converting unit;
the amplitude adjusting and analog-to-digital converting unit receives the electric signal from the optical signal receiving and converting unit to adjust the amplitude, is controlled by the control unit, converts the electric signal into a digital signal and sends the digital signal to the control unit;
and the control unit processes the digital signal to acquire the hemoglobin concentration and the blood oxygen saturation.
2. The blood oxygen saturation detection circuit according to claim 1, wherein said optical signal emitting unit further comprises an LED constant current source driving circuit and an adjustable current band optical signal emitting circuit.
3. The blood oxygen saturation detection circuit according to claim 2, wherein said adjustable current band optical signal transmitting circuit is an adjustable current 2 band optical signal transmitting circuit or an adjustable current 4 band optical signal transmitting circuit.
4. The blood oxygen saturation detection circuit according to claim 3, wherein said adjustable current 2-band optical signal transmitting circuit has wavelength band lengths of: 660nm and 940 nm; the adjustable current 4-waveband optical signal transmitting circuit has the following waveband lengths: 660nm, 730nm, 805nm and 940 nm.
5. The blood oxygen saturation detection circuit according to claim 1, wherein said optical signal receiving and converting unit further comprises, a photodiode and a current-voltage converting circuit; the photodiode converts received ambient light and transmitted light passing through the finger into a current signal, and the current signal is converted into a voltage signal through a current-voltage conversion circuit and then output.
6. The blood oxygen saturation level detecting circuit according to claim 1,
the optical signal transmitting unit adopts a chip with the model number of FP-3535RIR-B3C-F1 GKN;
the optical signal receiving and converting unit adopts an OPT101P-J photoelectric sensor chip;
the amplitude adjusting and analog-to-digital converting unit adopts a digital-to-analog converting chip with the model number of AD7124-8 BCPZ;
the control unit adopts a microprocessor chip with the model number of STM32L496RGT 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021559062.3U CN213097886U (en) | 2020-07-31 | 2020-07-31 | Blood oxygen saturation detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021559062.3U CN213097886U (en) | 2020-07-31 | 2020-07-31 | Blood oxygen saturation detection circuit |
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| Publication Number | Publication Date |
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| CN213097886U true CN213097886U (en) | 2021-05-04 |
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| CN202021559062.3U Active CN213097886U (en) | 2020-07-31 | 2020-07-31 | Blood oxygen saturation detection circuit |
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| CN (1) | CN213097886U (en) |
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- 2020-07-31 CN CN202021559062.3U patent/CN213097886U/en active Active
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