CN210277210U - Blood flow velocity detection system - Google Patents
Blood flow velocity detection system Download PDFInfo
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- CN210277210U CN210277210U CN201920465410.1U CN201920465410U CN210277210U CN 210277210 U CN210277210 U CN 210277210U CN 201920465410 U CN201920465410 U CN 201920465410U CN 210277210 U CN210277210 U CN 210277210U
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- 238000001514 detection method Methods 0.000 title claims abstract description 48
- 230000017531 blood circulation Effects 0.000 title claims abstract description 45
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 36
- 239000010703 silicon Substances 0.000 claims abstract description 36
- 230000003321 amplification Effects 0.000 claims abstract description 24
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 24
- 230000010354 integration Effects 0.000 claims 3
- 239000000523 sample Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
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- 230000004962 physiological condition Effects 0.000 description 1
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Abstract
The utility model discloses a blood flow velocity detection system, the utility model discloses a set up the work of master control circuit and on-off control circuit with control silicon light detector's transmitting terminal to cooperation carrier circuit, first filter circuit, first voltage follower circuit and first signal amplification circuit realize that blood flow velocity detects, and detecting system simple structure is low to the requirement of detection operation moreover, and the practicality is strong, can effectively improve detection efficiency, overcomes among the prior art technical problem that requirement height and detection efficiency are low of supersound Doppler blood flow velocity detection technique.
Description
Technical Field
The utility model belongs to the technical field of the blood flow detects and specifically relates to a blood flow velocity detecting system.
Background
With the development of science and technology, doctors can be helped to diagnose diseases by acquiring physical parameters of people, wherein blood flow parameters can well reflect the physiological conditions of human bodies, and blood flow velocity is a very important one of the blood flow parameters.
At present, the blood flow velocity can be detected by using an ultrasonic doppler detection technology, but the scheme is inconvenient to operate and has high requirements on the knowledge level of operators, in addition, the signal processing process is complex, and the detection efficiency of the blood flow velocity is low due to the defects.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the present invention provides a blood flow velocity detection system for detecting blood flow velocity.
The embodiment of the utility model provides an adopted technical scheme is: a blood flow velocity detection system comprises a silicon photodetector, a carrier circuit, a switch control circuit, a main control circuit, a first filter circuit, a first voltage follower circuit and a first signal amplifier circuit, the output end of the carrier circuit is connected with the input end of the switch control circuit, the output end of the main control circuit is connected with the control end of the switch control circuit, the output end of the switch control circuit is connected with the transmitting end of the silicon photodetector, the receiving end of the silicon photodetector is connected with the input end of the first filter circuit, the output end of the first filter circuit is connected with the input end of the first voltage follower circuit, the output end of the first voltage follower circuit is connected with the input end of the first signal amplification circuit, and the output end of the first signal amplification circuit is connected with the input end of the main control circuit.
Furthermore, the blood flow velocity detection system further comprises a third signal amplification circuit, an output end of the first filter circuit is connected with an input end of the third signal amplification circuit, and an output end of the third signal amplification circuit is connected with an input end of the switch control circuit.
Furthermore, the blood flow velocity detection system further comprises a second voltage following circuit and a second signal amplifying circuit, wherein the output end of the first signal amplifying circuit is connected with the input end of the second voltage following circuit, the output end of the second voltage following circuit is connected with the input end of the second signal amplifying circuit, and the output end of the second signal amplifying circuit is connected with the input end of the main control circuit.
Furthermore, the blood flow velocity detection system further comprises a second filter circuit, an output end of the second signal amplification circuit is connected with an input end of the second filter circuit, and an output end of the second filter circuit is connected with an input end of the main control circuit.
Further, the carrier circuit comprises an LMC555 timer chip.
Further, the switch control circuit comprises a first switch tube, a second switch tube, a third switch tube and a first operational amplifier, the control end of the first switch tube is connected with the output end of the main control circuit, the negative output end of the first switch tube is connected with the non-inverting input end of the first operational amplifier, the positive output end of the first switch tube is connected with a power supply, the output end of the carrier circuit is connected with the control end of the second switch tube, the negative output end of the second switch tube is connected with a power supply, the positive output end of the second switch tube is connected with the non-inverting input end of the first operational amplifier, the inverting input end of the first operational amplifier is connected with a power supply, the output end of the first operational amplifier is connected with the control end of the third switching tube, and the negative output end of the third switch tube is connected with a power supply, and the positive output end of the third switch tube is connected with the transmitting end of the silicon photodetector.
Further, the third signal amplifying circuit includes a second operational amplifier and an integrating circuit, an output terminal of the first filter circuit is connected to an inverting input terminal of the second operational amplifier, a non-inverting input terminal of the second operational amplifier is connected to a reference level, an output terminal of the second operational amplifier is connected to an input terminal of the integrating circuit, and an output terminal of the integrating circuit is connected to a non-inverting input terminal of the first operational amplifier.
Further, the first filter circuit is an operational amplifier filter circuit.
Furthermore, the blood flow velocity detection system further comprises a detector identification circuit, the silicon photodetector is connected with the input end of the detector identification circuit, and the output end of the detector identification circuit is connected with the input end of the main control circuit.
Furthermore, the detector identification circuit comprises a detector interface, a first resistor and a second resistor, wherein one end of the first resistor is connected with the power supply, the other end of the first resistor is connected with one end of the second resistor, the other end of the second resistor is connected with the input end of the main control circuit, the other end of the first resistor is connected with a first pin of the detector interface, a second pin of the detector interface is grounded, and the silicon photodetector is inserted into the detector interface and then is connected with the first pin and the second pin.
The utility model has the advantages that:
the utility model discloses a set up the work of master control circuit and on-off control circuit in order to control silicon light detector's transmitting terminal to cooperation carrier circuit, first filter circuit, first voltage follower circuit and first signal amplification circuit realize that blood flow velocity detects, and detecting system simple structure is low to the requirement of detection operation moreover, and the practicality is strong, can effectively improve detection efficiency, overcomes the technical problem that the requirement height and detection efficiency are low of supersound Doppler blood flow velocity detection technique among the prior art.
Additionally, the utility model discloses still further amplify blood flow speed detection signal through setting up second voltage follower circuit, second signal amplification circuit and second filter circuit, improve signal strength in order to improve the precision that blood flow speed detected.
Drawings
Fig. 1 is a block diagram of a blood flow velocity detection system according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an embodiment of the carrier circuit, the switch control circuit, the first filter circuit, the first voltage follower circuit, the third signal amplifier circuit and the detector identification circuit of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a block diagram of a blood flow velocity detecting system according to a specific embodiment of the present invention, the blood flow velocity detecting system includes a silicon photodetector, a carrier circuit, a switch control circuit, a main control circuit, a first filter circuit, a first voltage follower circuit, a first signal amplifier circuit, a second voltage follower circuit, a second signal amplifier circuit, a second filter circuit, a third signal amplifier circuit and a detector identification circuit, an output terminal of the carrier circuit is connected to an input terminal of the switch control circuit, an output terminal of the main control circuit is connected to a control terminal of the switch control circuit to control on/off of the switch control circuit, further control whether a transmitting terminal of the silicon photodetector works or not, an output terminal of the switch control circuit is connected to the transmitting terminal of the silicon photodetector, a receiving terminal of the silicon photodetector is connected to an input terminal of the first filter circuit, an output terminal of the first filter circuit is connected to an input terminal of the first voltage follower circuit, the output end of the first voltage follower circuit is connected with the input end of the first signal amplifying circuit; the output end of the first signal amplification circuit is connected with the input end of the second voltage follower circuit, and the output end of the second voltage follower circuit is connected with the input end of the second signal amplification circuit; the output end of the second signal amplification circuit is connected with the input end of the second filter circuit, the output end of the second filter circuit is connected with the input end of the main control circuit, the output end of the first filter circuit is connected with the input end of the third signal amplification circuit, and the output end of the third signal amplification circuit is connected with the input end of the switch control circuit so as to enhance the driving capability of the switch control circuit; the silicon photodetector is connected with the input end of the detector identification circuit, the output end of the detector identification circuit is connected with the input end of the main control circuit, and the detector identification circuit is used for identifying whether the silicon photodetector is connected.
The main control circuit and the switch control circuit are arranged to control the work of the transmitting end of the silicon photodetector, and the main control circuit can input a control signal to the control end of the switch control circuit to control the conduction of the switch control circuit and further control the work of the transmitting end of the silicon photodetector; the blood flow velocity detection signal is obtained by matching with a carrier circuit, a first filter circuit, a first voltage following circuit and a first signal amplifying circuit, and the blood flow velocity detection is further realized; the detection system is simple in structure, only a silicon photodetector is needed to be used for transmitting and receiving detection signals, the received signals are processed to detect the blood flow velocity, the requirement on detection operation is low, the practicability is high, the detection efficiency can be effectively improved, the technical problems that the requirement on an ultrasonic Doppler blood flow velocity detection technology is high and the detection efficiency is low in the prior art are solved, specifically, the blood flow velocity detection mode of the detection system can be a PPG mode, and the blood flow velocity of a detected person can be acquired by processing the PPG signals. In addition, a second voltage following circuit, a second signal amplifying circuit and a second filter circuit are further arranged to amplify the blood flow speed detection signal, so that the signal intensity is improved, and the accuracy of blood flow speed detection is improved. Finally, a detector identification circuit is also arranged to identify whether the silicon photodetector is accessed, and the main control circuit can be set to start working when the silicon photodetector is accessed, so that the energy consumption of the detection system can be saved, and the service life of the detection system can be prolonged.
Further, master control circuit includes treater such as singlechip, refer to fig. 2, fig. 2 is the utility model discloses a carrier circuit, on-off control circuit, first filter circuit, first voltage follower circuit, third signal amplification circuit and detector identification circuit's a specific embodiment circuit diagram, carrier circuit 1 includes LMC555 timer chip U18, and carrier circuit 1 produces a square wave signal as the carrier wave. The switch control circuit 2 includes a first switch tube Q20, a second switch tube Q19, a third switch tube Q21 and a first operational amplifier U21A, the first operational amplifier U21A adopts one-way operational amplifier of an LMC64821 chip, the LMC64821 chip is a two-way CMOS operational amplifier, the control end of the first switch tube Q20 is connected with the output end PPG _ EN (enable end) of the main control circuit, the negative output end of the first switch tube Q20 is connected with the non-inverting input end of the first operational amplifier U21A, the positive output end of the first switch tube Q20 is connected with the power supply +5ANA, the output end of the carrier circuit 1 is connected with the control end of the second switch tube Q19 (i.e. the output end of the chip U18 is connected with the control end of the second switch tube Q19 after passing through the resistor R86), the negative output end of the second switch tube Q19 is connected with the power supply +5ANA, the positive output end of the second switch tube 85q 25 is connected with the non-inverting input end of the first switch tube U21 operational amplifier A, the inverting input end of the first operational amplifier U21A is connected with the power supply +5ANA through a resistor R88, the output end of the first operational amplifier U21A is connected with the control end of a third switching tube Q21, the negative output end of the third switching tube Q21 is connected with the power supply +5ANA through a resistor R88, and the positive output end of the third switching tube Q21 is connected with the emission end PPG _ V1 of the silicon photodetector. The switch control circuit 2 controls whether to conduct the third switch tube Q21 according to a control signal PPG _ EN input by the main control circuit, and further controls whether the transmitting end of the silicon photodetector works. The first switch tube Q20 is an NPN triode, a base of the NPN triode is a control terminal of the first switch tube Q20, an emitter of the NPN triode is a negative output terminal of the first switch tube Q20, and a collector of the NPN triode is a positive output terminal of the first switch tube Q20. In addition, the second switch tube Q19 and the third switch tube Q21 are both PNP triodes, bases of the PNP triodes are control ends of the second switch tube Q19 and the third switch tube Q21, emitters of the PNP triodes are negative output ends of the second switch tube Q19 and the third switch tube Q21, and collectors of the PNP triodes are positive output ends of the second switch tube Q19 and the third switch tube Q21.
Further, referring to fig. 2, the first filter circuit 5 is an operational amplifier filter circuit, specifically, the operational amplifier filter circuit includes a third operational amplifier U27, a resistor R109 and a capacitor C115, the U27 adopts an AD8627 high-voltage amplifier chip, an inverting input terminal of U27 is connected to a receiving terminal PPG _ V2 of the silicon photodetector, and the first filter circuit 5 is an active high-pass filter circuit for filtering an interference signal to improve the accuracy of the blood flow velocity detection result. In addition, the first voltage follower circuit 6 comprises a fourth operational amplifier U23C, and the U23C adopts an LMC6036 model operational amplifier to realize that the output voltage follows the input voltage; the output end a of the first voltage follower circuit 6 is connected with the input end of the first signal amplifying circuit. Similarly, the second voltage follower circuit has the same structure as the first voltage follower circuit, and is not repeated. Furthermore, the first signal amplifying circuit comprises an LMC6036 model operational amplifier to amplify the input signal, and similarly, the second signal amplifying circuit can adopt one path of operational amplifier of the LMC64821 chip to realize signal amplification.
Further, referring to fig. 1 and 2, the third signal amplifying circuit includes a second operational amplifier U23A and an integrating circuit, an output terminal of the first filter circuit 5 is connected to an inverting input terminal of the second operational amplifier U23A, a non-inverting input terminal of the second operational amplifier U23A is connected to the reference level P _ V _ GND, an output terminal of the second operational amplifier U23A is connected to an input terminal of the integrating circuit, and an output terminal of the integrating circuit is connected to a non-inverting input terminal of the first operational amplifier U21A. The integrating circuit comprises a fifth operational amplifier U21B and a capacitor CX5, the output end of a second operational amplifier U23A is connected with the inverting input end of the fifth operational amplifier U21B through a resistor R106, the second operational amplifier U23A adopts an LMC6036 model operational amplifier, and the fifth operational amplifier U21B is realized by one operational amplifier of an LMC64821 chip; in addition, the reference level P _ V _ GND of the second operational amplifier U23A is provided as a virtual ground by the third operational amplifier U27 through the capacitor C119 and the resistor R119, and the voltage is about 2.5V. The third signal amplifying circuit amplifies the signal at the receiving end of the silicon photodetector and feeds the amplified signal back to the switch control circuit 2 to improve the driving capability of the third switching tube Q21, thereby enhancing the intensity of the transmitted signal of the silicon photodetector.
Finally, referring to fig. 2, the detector identification circuit 4 includes a detector interface J21, a first resistor R105 and a second resistor R108, one end of the first resistor R105 is connected to the power supply +5ANA, the other end of the first resistor R105 is connected to one end of the second resistor R108, the other end of the second resistor R108 is connected to the input terminal PPG _ PROBE of the main control circuit, the other end of the first resistor R105 is connected to the first pin of the detector interface J21, the second pin of the detector interface J21 is grounded, after the silicon photodetector is inserted into the detector interface J21, the first pin and the second pin are connected to ground the first pin, and the input level of the input terminal PPG _ PROBE is further pulled low. When the silicon photodetector is not connected with the circuit, the level of the input end PPG _ PROBE is high, when the silicon photodetector is connected, the signal of the input end PPG _ PROBE is pulled down, the main control circuit judges whether the silicon photodetector is connected with the circuit or not by judging the level of the input end PPG _ PROBE, and when the silicon photodetector is connected, the detection system is controlled to start working, so that the energy consumption can be effectively saved, and the working duration of the detection system can be prolonged. Referring to fig. 2, in this embodiment, the other end of the first resistor R105 is connected to the first pin 5 of the probe interface J21, the second pin 1 of the probe interface J21 is grounded, the third pin 6 of the probe interface J21 is connected to the second pin 1, and after the silicon photodetector is inserted into the probe interface J21, the third pin 6 and the first pin 5 are connected and conducted to ground the first pin 5.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (10)
1. A blood flow velocity detection system is characterized by comprising a silicon photodetector, a carrier circuit, a switch control circuit, a main control circuit, a first filter circuit, a first voltage follower circuit and a first signal amplification circuit, the output end of the carrier circuit is connected with the input end of the switch control circuit, the output end of the main control circuit is connected with the control end of the switch control circuit, the output end of the switch control circuit is connected with the transmitting end of the silicon photodetector, the receiving end of the silicon photodetector is connected with the input end of the first filter circuit, the output end of the first filter circuit is connected with the input end of the first voltage follower circuit, the output end of the first voltage follower circuit is connected with the input end of the first signal amplification circuit, and the output end of the first signal amplification circuit is connected with the input end of the main control circuit.
2. The blood flow velocity detection system according to claim 1, further comprising a third signal amplification circuit, wherein an output terminal of the first filter circuit is connected to an input terminal of the third signal amplification circuit, and an output terminal of the third signal amplification circuit is connected to an input terminal of the switch control circuit.
3. The blood flow velocity detection system according to claim 2, further comprising a second voltage follower circuit and a second signal amplifier circuit, wherein an output terminal of the first signal amplifier circuit is connected to an input terminal of the second voltage follower circuit, an output terminal of the second voltage follower circuit is connected to an input terminal of the second signal amplifier circuit, and an output terminal of the second signal amplifier circuit is connected to an input terminal of the main control circuit.
4. The blood flow velocity detection system according to claim 3, further comprising a second filter circuit, wherein an output terminal of the second signal amplification circuit is connected to an input terminal of the second filter circuit, and an output terminal of the second filter circuit is connected to an input terminal of the main control circuit.
5. The blood flow velocity detection system according to any one of claims 2 to 4, wherein the carrier circuit comprises an LMC555 timer chip.
6. The blood flow velocity detection system according to any one of claims 2 to 4, wherein the switch control circuit comprises a first switch tube, a second switch tube, a third switch tube and a first operational amplifier, a control terminal of the first switch tube is connected to the output terminal of the main control circuit, a negative output terminal of the first switch tube is connected to a non-inverting input terminal of the first operational amplifier, a positive output terminal of the first switch tube is connected to a power supply, an output terminal of the carrier circuit is connected to the control terminal of the second switch tube, a negative output terminal of the second switch tube is connected to the power supply, a positive output terminal of the second switch tube is connected to the non-inverting input terminal of the first operational amplifier, an inverting input terminal of the first operational amplifier is connected to the power supply, and an output terminal of the first operational amplifier is connected to the control terminal of the third switch tube, and the negative output end of the third switch tube is connected with a power supply, and the positive output end of the third switch tube is connected with the transmitting end of the silicon photodetector.
7. The blood flow velocity detection system according to claim 6, wherein the third signal amplification circuit comprises a second operational amplifier and an integration circuit, an output terminal of the first filter circuit is connected to an inverting input terminal of the second operational amplifier, a non-inverting input terminal of the second operational amplifier is connected to a reference level, an output terminal of the second operational amplifier is connected to an input terminal of the integration circuit, and an output terminal of the integration circuit is connected to a non-inverting input terminal of the first operational amplifier.
8. The blood flow velocity detection system according to any one of claims 1 to 4, wherein the first filter circuit is an operational amplifier filter circuit.
9. The blood flow velocity detection system according to any one of claims 1 to 4, further comprising a detector identification circuit, wherein the silicon photodetector is connected to an input of the detector identification circuit, and an output of the detector identification circuit is connected to an input of the main control circuit.
10. The blood flow velocity detection system according to claim 9, wherein the detector identification circuit includes a detector interface, a first resistor and a second resistor, one end of the first resistor is connected to a power supply, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to an input end of the main control circuit, the other end of the first resistor is connected to a first pin of the detector interface, a second pin of the detector interface is grounded, and the silicon photodetector is inserted into the detector interface and then connects the first pin to the second pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920465410.1U CN210277210U (en) | 2019-04-08 | 2019-04-08 | Blood flow velocity detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920465410.1U CN210277210U (en) | 2019-04-08 | 2019-04-08 | Blood flow velocity detection system |
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| CN210277210U true CN210277210U (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920465410.1U Withdrawn - After Issue CN210277210U (en) | 2019-04-08 | 2019-04-08 | Blood flow velocity detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110037741A (en) * | 2019-04-08 | 2019-07-23 | 深圳市贝斯曼精密仪器有限公司 | Blood flow velocity detection system |
-
2019
- 2019-04-08 CN CN201920465410.1U patent/CN210277210U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110037741A (en) * | 2019-04-08 | 2019-07-23 | 深圳市贝斯曼精密仪器有限公司 | Blood flow velocity detection system |
| CN110037741B (en) * | 2019-04-08 | 2024-02-20 | 深圳市贝斯曼精密仪器有限公司 | Blood flow velocity detection system |
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