CN109998596B - Ultrasonic detection device with blood flow direction detection function - Google Patents
Ultrasonic detection device with blood flow direction detection function Download PDFInfo
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- CN109998596B CN109998596B CN201910277021.0A CN201910277021A CN109998596B CN 109998596 B CN109998596 B CN 109998596B CN 201910277021 A CN201910277021 A CN 201910277021A CN 109998596 B CN109998596 B CN 109998596B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/02—Measuring pulse or heart rate
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/06—Measuring blood flow
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4411—Device being modular
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4444—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device related to the probe
Abstract
The application discloses an ultrasonic detection device with a blood flow direction detection function, which is characterized in that an ultrasonic detection module is arranged to emit a first ultrasonic detection analog signal, and receives a second ultrasonic detection analog signal which is fed back to be transmitted to a blood flow signal branching module, the received second ultrasonic detection analog signal is branched by using 2 paths of demodulation signals with 90-degree phase difference and then is input to a blood flow direction processing module for signal processing, the blood flow direction processing module processes the second ultrasonic detection analog signal and then outputs an ultrasonic detection digital signal to a main control module, and the main control module receives and processes the ultrasonic detection digital signal and obtains the blood flow direction to be detected, so that the technical problem that the ultrasonic detection device in the prior art cannot effectively and reliably detect the blood flow direction is solved.
Description
Technical Field
The application relates to the technical field of medical equipment, in particular to an ultrasonic detection device with a blood flow direction detection function.
Background
When the ultrasonic blood flow detection device is used for detecting blood flow information (such as blood speed and pulse frequency), the blood flow of the human body causes vasodilation and contraction, and the ultrasonic detected signals have forward blood flow signals and reverse blood flow signals, so that detection and identification are needed, and the subsequent processing and analysis of the blood flow signals are convenient.
In the prior art, the ultrasonic detection device cannot effectively and reliably detect the blood flow direction, so that the technical problem which needs to be solved in the field is to provide the ultrasonic detection device capable of detecting the blood flow direction.
Disclosure of Invention
The present application aims to solve at least one of the technical problems in the related art to some extent. It is therefore an object of the present application to provide an efficient and reliable ultrasound probe with blood flow direction detection.
The technical scheme adopted by the application is as follows:
in a first aspect, the present application provides an ultrasound probe apparatus having a blood flow direction detection function, comprising:
the ultrasonic detection module is used for transmitting a first ultrasonic detection analog signal and receiving a second ultrasonic detection analog signal formed by reflecting the first ultrasonic detection analog signal after blood passing;
the blood flow signal branching module is used for respectively carrying out branching output processing on the second ultrasonic detection analog signals received by the ultrasonic detection module by utilizing 2 paths of demodulation signals;
the blood flow flows to the processing module; the blood flow signal branching module is used for processing the ultrasonic detection analog signals outputted by the blood flow signal branching module and outputting ultrasonic detection digital signals;
the main control module is used for receiving and processing and analyzing the ultrasonic detection digital signals to acquire blood flow direction data information.
Further, the ultrasonic detection module comprises an ultrasonic probe, and the ultrasonic probe comprises an ultrasonic wave generating circuit, an ultrasonic wave receiving resonant circuit and an ultrasonic wave transmitting circuit; the output end of the ultrasonic receiving resonant circuit is connected with the input end of the blood flow signal branching module, and the output end of the ultrasonic generating circuit is respectively connected with the input end of the ultrasonic transmitting circuit and the input end of the blood flow signal branching module.
Further, the blood flow signal branching module comprises a first frequency dividing circuit and a second frequency dividing circuit; the first output end of the ultrasonic wave generating circuit is connected with the first input end of the first frequency dividing circuit, the output end of the ultrasonic wave receiving resonant circuit is connected with the second input end of the first frequency dividing circuit, the output end of the first frequency dividing circuit is connected with the first input end of the blood flow direction processing module, the second output end of the ultrasonic wave generating circuit is connected with the first input end of the second frequency dividing circuit, the output end of the ultrasonic wave receiving resonant circuit is connected with the second input end of the second frequency dividing circuit, and the output end of the second frequency dividing circuit is connected with the second input end of the blood flow direction processing module.
Further, the first frequency dividing circuit includes: the second resistor, the third resistor, the fourth resistor, the fifth capacitor, the sixth capacitor, the second inductor and the second triode; one end of the fourth resistor is connected with the first output end of the ultrasonic wave generating circuit, the other end of the fourth resistor is connected with one end of the sixth capacitor, the other end of the sixth capacitor is connected with one end of the third resistor and the base electrode of the second triode respectively, the emitter of the second triode is connected with one end of the second inductor and the first output end of the ultrasonic wave receiving resonance circuit respectively, the other end of the second inductor is grounded, the other end of the third resistor is connected with the collector of the second triode, one end of the second resistor, one end of the fifth capacitor and the first input end of the blood flow direction processing module respectively, the other end of the second resistor is connected with an external 2V power supply, and the other end of the fifth capacitor is grounded.
Further, the second frequency dividing circuit includes: a fifth resistor, a sixth resistor, a seventh capacitor, an eighth capacitor, a third triode, a third inductor and a third inverter; the input end of the third inverter is connected with the second output end of the ultrasonic wave generating circuit, the output end of the third inverter is connected with one end of the seventh resistor, the other end of the seventh resistor is connected with one end of the eighth capacitor, the other end of the eighth capacitor is connected with one end of the sixth resistor and the base electrode of the third triode respectively, the emitter electrode of the third triode is connected with one end of the third inductor and the second output end of the ultrasonic wave receiving resonant circuit respectively, the other end of the third inductor is grounded, the other end of the sixth resistor is connected with the collector electrode of the third triode, one end of the fifth resistor, one end of the seventh capacitor and the second input end of the blood flow direction processing module respectively, the other end of the fifth resistor is connected with an external 2V power supply, and the other end of the seventh capacitor is grounded.
Further, the blood flow direction processing module comprises a first blood flow direction processing sub-module and a second blood flow direction processing sub-module; the first blood flow direction processing submodule comprises a first filtering amplifying circuit and a first analog-to-digital conversion circuit, wherein the output end of the first frequency dividing circuit is connected with the input end of the first filtering amplifying circuit, the output end of the first filtering amplifying circuit is connected with the input end of the first analog-to-digital conversion circuit, and the output end of the first analog-to-digital conversion circuit is connected with the input end of the main control module; the second blood flow direction processing submodule comprises a second filtering amplifying circuit and a second analog-to-digital conversion circuit, wherein the output end of the second frequency dividing circuit is connected with the input end of the second filtering amplifying circuit, the output end of the second filtering amplifying circuit is connected with the input end of the second analog-to-digital conversion circuit, and the output end of the second analog-to-digital conversion circuit is connected with the input end of the main control module.
Further, the first filtering and amplifying circuit comprises a first low-pass filtering circuit, a first signal amplifying circuit and a first high-pass filtering circuit; the output end of the first frequency division circuit is connected with the input end of the first low-pass filter circuit, the output end of the first low-pass filter circuit is connected with the input end of the first signal amplification circuit, the output end of the first signal amplification circuit is connected with the input end of the first high-pass filter circuit, and the output end of the first high-pass filter circuit is connected with the input end of the first analog-to-digital conversion circuit.
Further, the second filtering and amplifying circuit comprises a second low-pass filtering circuit, a second signal amplifying circuit and a second high-pass filtering circuit; the output end of the second frequency division 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 second signal amplifying circuit, the output end of the second signal amplifying circuit is connected with the input end of the second high-pass filter circuit, and the output end of the second high-pass filter circuit is connected with the input end of the second analog-to-digital conversion module.
The beneficial effects of the application are as follows:
the ultrasonic detection device with the blood flow direction detection function transmits the first ultrasonic detection analog signal through the ultrasonic detection module, receives the second ultrasonic detection analog signal which is fed back, transmits the second ultrasonic detection analog signal to the blood flow signal branching module, branches the received second ultrasonic detection analog signal by utilizing 2 paths of demodulation signals with opposite phases, inputs the second ultrasonic detection analog signal to the blood flow direction processing module for signal processing, the blood flow direction processing module processes the ultrasonic detection analog signal and outputs an ultrasonic detection digital signal to the main control module, and the main control module receives and processes the ultrasonic detection digital signal and obtains the blood flow direction to be detected, so that the technical problem that the ultrasonic detection device in the prior art cannot effectively and reliably detect the blood flow direction is solved.
Drawings
FIG. 1 is a block diagram of an exemplary embodiment of an ultrasonic detection device with blood flow direction detection function according to the present application;
FIG. 2 is a circuit diagram of an embodiment of an ultrasonic wave generating circuit of an ultrasonic detection module in an ultrasonic detection device with blood flow direction detection function according to the present application;
FIG. 3 is a circuit diagram of an embodiment of an ultrasonic transmitting circuit of an ultrasonic detection module in an ultrasonic detection device with blood flow direction detection function according to the present application;
FIG. 4 is a circuit diagram of an embodiment of an ultrasonic receiving resonant circuit of an ultrasonic detection module in an ultrasonic detection device with blood flow direction detection function according to the present application;
FIG. 5 is a circuit diagram of a first divider circuit of a blood flow signal splitting module in an ultrasonic probe with blood flow direction detection function according to an embodiment of the present application;
FIG. 6 is a circuit diagram of a second frequency division circuit of a blood flow signal splitting module in an ultrasonic detection device with blood flow direction detection function according to an embodiment of the present application;
FIG. 7 is a circuit diagram of a first filter amplifier circuit and a second filter amplifier circuit of a blood flow direction processing module in an ultrasonic detection device with blood flow direction detection function according to an embodiment of the present application;
FIG. 8 is a circuit diagram of a first analog-to-digital conversion circuit of a blood flow direction processing module in an ultrasonic detection device with blood flow direction detection function according to an embodiment of the present application;
FIG. 9 is a circuit diagram of a second analog-to-digital conversion circuit of the signal flow direction output module in an ultrasonic detection device with blood flow direction detection function according to an embodiment of the present application;
fig. 10 is a circuit diagram of a main control module in an ultrasonic detecting device with blood flow direction detection function according to an embodiment of the present application.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
As shown in fig. 1, an ultrasonic detection device with a blood flow direction detection function in this embodiment includes an ultrasonic detection module, a blood flow signal branching module, a blood flow direction processing module and a main control module; the blood flow direction processing module processes the received second ultrasonic detection analog signals and outputs ultrasonic detection digital signals to the main control module, and the main control module receives and processes the ultrasonic detection digital signals and obtains the blood flow direction to be detected, so that the technical problem that an ultrasonic detection device in the prior art cannot effectively and reliably detect the blood flow direction is solved.
In this embodiment, the ultrasonic detection module is an ultrasonic probe, which includes an ultrasonic generating circuit, an ultrasonic receiving resonant circuit, and an ultrasonic transmitting circuit, and the blood flow signal branching module includes a first frequency dividing circuit and a second frequency dividing circuit. Specifically, referring to fig. 2, the ultrasonic wave generating circuit includes an 8MHz passive crystal oscillator Y1, ninth to twelfth resistors R9 to R12, a fifth inductance L5, an eleventh capacitance R11, a twelfth capacitance C12, a first inverter U1, and a second inverter U2; the twelfth resistor R12 is a slide rheostat, the X1 end of the 8MHz passive crystal oscillator Y1 is respectively connected with one end of a ninth resistor R9, one end of a twelfth capacitor C12 and one end of a first inverter U1, the X2 end of the 8MHz passive crystal oscillator Y1 is respectively connected with one end of the first inverter U1, one end of a second inverter U2, the other end of the ninth resistor R9 and one end of an eleventh capacitor C11, the other end of the eleventh capacitor C11 is connected with the other end of the twelfth capacitor C12 and then commonly grounded, the output end of the second inverter U2 is a first output end of an ultrasonic wave generating circuit, the output end of the second inverter U2 is respectively connected with one end of an ultrasonic wave transmitting circuit, the first input end of a first frequency dividing circuit and one end of a tenth resistor R10, the other end of the tenth resistor R10 is respectively connected with one end of a fifth inductor L5, the other end of the fifth inductor L5 (namely, the second output end of the ultrasonic wave generating circuit) is respectively connected with one end of the eleventh resistor R11 and the twelfth resistor R12, the other end of the eleventh resistor C12 is connected with the first fixed end of the eleventh resistor R11, the eleventh resistor R11 is connected with the second fixed end of the eleventh resistor R12, and the twelfth resistor R12 is connected with the twenty-first resistor R12 and the twenty-first resistor is commonly grounded; the 8MHZ signal output by the first output end of the ultrasonic circuit and the 8.1MHZ signal output by the second output end of the ultrasonic circuit are actually only the signal phase of the second output end is delayed by 90 degrees compared with the signal phase of the first output end, the amplitude and the frequency of the signals of the two output ends are consistent, the 8.1MHZ signals are marked for distinguishing the difference of the phases of the signals of the two output ends, and the signals are received by the first frequency dividing circuit and the second frequency dividing circuit through 2 paths of demodulation signals with 90 degrees of phase difference; at the same time, the ultrasonic wave transmitting circuit is supplied to transmit the ultrasonic wave detection analog signal outwards. Referring to fig. 3, the ultrasonic wave transmitting circuit includes a ninth capacitor C9, a tenth capacitor C10, an eighth resistor R8, a fourth inductor L4, a fourth transistor Q4, and a transmitting ceramic wafer; the two ends of the transmitting ceramic wafer are respectively connected with interfaces of J1 and J2, one end of a ninth capacitor C9 (namely the input end of an ultrasonic transmitting circuit) is connected with the output end of a second inverter U2, the other end of the ninth capacitor C9 is respectively connected with the base electrode of a fourth triode Q4 and one end of an eighth resistor R8, the other end of the eighth resistor R8 is respectively connected with one end of a tenth capacitor C10 and one end of a fourth inductor L4 and then is connected with an external 2V power supply, the other end of the tenth capacitor C10 is respectively connected with the collector electrode of the fourth triode Q4, the other end of the fourth inductor L4 and the interface of J1, the emitter electrode of the fourth triode Q4 is commonly grounded after being connected with the interface of J2, and the transmitting ceramic wafer is used for transmitting a first ultrasonic detection analog signal outwards after receiving an 8MHz signal generated by the ultrasonic generating circuit. Referring to fig. 4, the ultrasonic receiving resonant circuit includes a receiving ceramic wafer, a first resonant transformer T1, a first amplifying tube Q1, first to fourth capacitors C1 to C4, a first resistor R1, a first inductor L1, a first output end AS1, and a second output end AS2; wherein the first amplifying transistor Q1 is a first triode Q1, two ends of the receiving ceramic wafer are respectively connected with interfaces of J9A and J10A, a first input end of the first resonant transformer T1 is connected with the interface of J9A, a second input end of the first resonant transformer T1 is connected with the interface of J10A, a first output end of the first resonant transformer T1 is respectively connected with one end of a fourth capacitor C4 and a base electrode of the first triode Q1, a second output end of the first resonant transformer T1 is respectively connected with the other end of the fourth capacitor C4 and an emitter electrode of the first triode Q1 and then commonly grounded, a collector electrode of the first triode Q1 is respectively connected with one end of a first inductor L1, one end of a first resistor R1, one end of the first capacitor C1 and one end of a second capacitor C2, the other end of the first inductor L1 is respectively connected with the other end of the first resistor R1 and one end of the third capacitor C3, then is connected with an external 2V power supply, the other end of the third capacitor C3 is grounded, the other end of the first capacitor C1 is connected with the first output end AS1, then is connected with the blood flow signal branching module, the other end of the second capacitor C2 is connected with the second output end AS2, then is connected with the blood flow signal branching module, and the second ultrasonic detection analog signal which is received and fed back through the receiving ceramic wafer is amplified by the first triode Q1, and then is output to the blood flow signal branching module by the first output end AS1 and the second output end AS 2.
Referring to fig. 5, in the present embodiment, the first frequency dividing circuit includes second to fourth resistors R2 to R4, a fifth capacitor C5, a sixth capacitor C6, a second inductor L2 and a second triode Q2; one end of the fourth resistor R4 (i.e., the first input end of the first frequency dividing circuit) is connected to the output end of the second inverter U2 in the ultrasonic wave generating circuit, the other end of the fourth resistor R4 is connected to one end of the sixth capacitor C6, the other end of the sixth capacitor C6 is connected to one end of the third resistor R3 and the base of the second triode Q2, the emitter of the second triode Q2 (i.e., the second input end of the first frequency dividing circuit) is connected to one end of the second inductor L2 and the first output end AS1 of the ultrasonic wave receiving resonant circuit, the other end of the second inductor L2 is grounded, the other end of the third resistor R3 is connected to the collector of the second triode Q2, one end of the second resistor R2, one end of the fifth capacitor C5 and the first input end of the blood flow direction processing module, the other end of the second resistor R2 is connected to the external 2V power supply, and the other end of the fifth capacitor C5 is grounded, and the 8MHz signal source generated by the receiving ultrasonic wave generating circuit and the first output end AS1 of the ultrasonic wave receiving resonant circuit are output to the processing module. Referring to fig. 6, the second frequency dividing circuit includes fifth to seventh resistors R5 to R7, a seventh capacitor C7, an eighth capacitor C8, a third transistor Q3, a third inductance L3, and a third inverter U3; the input end of the third inverter U3 is connected to the output end of the second inverter U2 in the ultrasonic generating circuit, the output end of the third inverter U3 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to one end of the eighth capacitor C8, the other end of the eighth capacitor C8 is connected to one end of the sixth resistor R6 and the base of the third triode Q3, the emitter of the third triode Q3 is connected to one end of the third inductor L3 and the second output end AS2 of the ultrasonic receiving resonant circuit, the other end of the third inductor L3 is grounded, the other end of the sixth resistor R6 is connected to the collector of the third triode Q3, one end of the fifth resistor R5, one end of the seventh capacitor C7 and the second input end of the blood flow processing module, the other end of the fifth resistor R5 is connected to the external 2V power supply, and the other end of the seventh capacitor C7 is grounded by receiving the 8MHz signal source generated by the ultrasonic generating circuit and connecting it to the third inverter U3 and receiving the second output end AS2 of the ultrasonic receiving resonant circuit.
In this embodiment, the blood flow direction processing module includes a first blood flow direction processing sub-module and a second blood flow direction processing sub-module; the first blood flow direction processing submodule comprises a first filtering amplifying circuit and a first analog-to-digital conversion circuit, the second blood flow direction processing submodule comprises a second filtering amplifying circuit and a second analog-to-digital conversion circuit, the first filtering amplifying circuit comprises a first low-pass filtering circuit, a first signal amplifying circuit and a first high-pass filtering circuit, and the second filtering amplifying circuit comprises a second low-pass filtering circuit, a second signal amplifying circuit and a second high-pass filtering circuit. Specifically, referring to fig. 7, the first low-pass filter circuit includes: thirteenth to seventeenth capacitances C13 to C17, thirteenth to sixteenth resistances R13 to R16, fifth transistor Q5, and first filter switch chip U4; the first signal amplifying circuit includes: seventeenth to nineteenth resistors R17 to R19 and a first operational amplifier U5; the first high-pass filter circuit includes: an eighteenth capacitor C18, a nineteenth capacitor C19, a twentieth resistor R20 to a twenty-second resistor R22, and a second operational amplifier U6; the second low-pass filter circuit includes: the twenty-first capacitor C20 to the twenty-fourth capacitor C24, the twenty-third resistor R23 to the twenty-fifth resistor R25, and the second filter switch chip U7; the second signal amplifying circuit includes: a twenty-sixth resistor R26 to a twenty-eighth resistor R28 and a third operational amplifier U8; the second high-pass filter circuit includes: a twenty-first capacitor C25, a twenty-sixth capacitor C26, a twenty-ninth resistor R29 to a thirty-first resistor R31, and a fourth operational amplifier U9; the first filter switch chip U4 and the second filter switch chip U7 are TC4W66F chips, the first operational amplifier U5 to the fourth operational amplifier U9 are TL064 operational amplifiers, and the tenth resistor R10 and the twentieth resistor R20 are slide varistors; one end of a thirteenth capacitor C13 (i.e., the input end of the first filter amplifier circuit) is connected with the output end SI1 of the first frequency divider circuit, and is used for receiving a second ultrasonic detection analog signal transmitted by an ultrasonic signal detection probe, the other end of the thirteenth capacitor C13 is connected with the first fixed end of a tenth resistor R10, the second fixed end of the tenth resistor R10 is grounded, the sliding end of the tenth resistor R10 is respectively connected with one end of an eleventh resistor R11, one end of a fourteenth capacitor C14, the input end of a first filter switch chip U4, the other end of the eleventh resistor R11 is grounded, the other end of the fourteenth capacitor C14 is respectively connected with one end of a twelfth resistor R12 and one end of a fifteenth capacitor C15, the other end of the fifteenth capacitor C15 is respectively connected with one end of a sixteenth capacitor C16, one end of a seventeenth capacitor C17, one end of a first operational amplifier U5, the other end of a sixteenth resistor R16 is connected with the other end of a sixteenth resistor R16, the other end of a seventeenth resistor R16 is connected with the other end of a seventeenth resistor R18, the other end of a seventeenth resistor R16 is connected with the eighteenth resistor R6, the other end of the eighteenth resistor R18 is connected with the eighteenth end of the eighteenth resistor R18, the eighteenth resistor R18 is connected with the eighteenth end of the eighteenth resistor R6, the eighteenth resistor R18 is connected with the eighteenth end of the seventeenth resistor R18, the eighteenth resistor R18 is amplified, the seventeenth end of the seventeenth resistor R16 is connected with the seventeenth resistor R18, and the seventeenth end of the seventeenth resistor is amplified, the seventeenth end of the seventeenth capacitor is connected with the seventeenth capacitor, the seventeenth end of the seventeenth capacitor is, one end of the nineteenth capacitor C19 and one end of the nineteenth resistor R19 are connected, and the other end of the nineteenth resistor R19 is connected to the other end of the nineteenth capacitor C19 and the output end of the second operational amplifier U6, respectively. The enabling end IN2 of the first filter switch chip is respectively connected with one end of a thirteenth resistor R13 and an emitter of a fifth triode Q5, a base electrode of the fifth triode Q5 is connected with the main control module, a collector electrode of the fifth triode Q5 is connected with an external 5V power supply, the other end of the thirteenth resistor R13 is connected with an external-4.6V power supply, positive power supply input ends of the first operational amplifier U5 and the second operational amplifier U6 are connected with the 5V power supply, and negative power supply input ends of the first operational amplifier U5 and the second operational amplifier U6 are connected with the-4.6V power supply. The circuit structure of the second filter amplifying circuit is basically identical to that of the first filter amplifying circuit, as shown in fig. 7, but it should be noted that the enabling end of the second filter switch chip U7 may be connected to the enabling end of the first filter switch chip U4 and then connected to the main control module through the fifth triode Q5; by arranging the first filtering amplifying circuit and the second filtering amplifying circuit, signals transmitted by the first frequency dividing circuit and the second frequency dividing circuit are filtered, amplified and output, and the effectiveness and the reliability of subsequent signal processing are ensured.
As shown in fig. 8 and 9, the present embodimentIn the embodiment, the first analog-to-digital conversion module and the second analog-to-digital conversion module are respectively used for converting 2 paths of ultrasonic detection analog signals output by the first filtering amplification circuit and the second filtering amplification circuit into ultrasonic detection digital signals and outputting the ultrasonic detection digital signals; specifically, referring to fig. 8, the first analog-to-digital conversion module includes a twenty-seventh capacitor C27, a twenty-eighth capacitor C28, a thirty-second resistor R32 to a thirty-eighth resistor R38, a first diode D1, a second diode D2, a first comparator U10, and a first analog-to-digital conversion chip U11; wherein the first comparator U10 is an LM393 comparator, the first analog-to-digital conversion chip U11 is a 74HC74 chip, one end of the twenty-seventh capacitor C27 is connected to an output end (refer to fig. 7, i.e., an output end U6 of the second operational amplifier) A1B of the first filter amplifying circuit, the other end of the twenty-seventh capacitor C27 is connected to one end of the thirty-second resistor R32 and one end of the thirty-third resistor R33, the other end of the thirty-second resistor R32 is grounded, the other end of the thirty-third resistor R33 is connected to an anode of the first diode D1, a cathode of the second diode D2, an inverting input end of the first comparator U10, a cathode of the first diode D1 is connected to an anode of the second diode D2 and then grounded, one end of the thirty-fourth resistor R34 is connected to an external power supply of-4.6V, the other end of the thirty-fourth resistor R34 is connected to one end of the thirty-fifth resistor R35, one end of the thirty-sixth resistor R28, one end of the thirty-sixth resistor R36, the other end of the thirty-sixth resistor R32, the other end of the thirty-fifth resistor R10, the thirty-fourth resistor R35, the thirty-second end of the thirty-fourth resistor R35 is connected to the thirty-fifth resistor R13, and the other end of the thirty-fourth resistor R13 is connected to the thirty-fifth resistor R13, and the thirty-fourth resistor R13 is connected to the other end of the thirty-fourth resistor R13, respectively, and the thirty-fourth resistor R10 is connected to the other end of the thirty-fifth resistor RThe other end of the thirty-seventh resistor R37 is connected with an external 5V power supply, the other end of the thirty-eighth resistor R38 is connected with the clock signal input end CLK of the first analog-digital conversion chip U11, and the Q output end of the first analog-digital conversion chip U11 is connected with the main control module; referring to fig. 9, the second analog-to-digital conversion module includes a twenty-ninth capacitorC29, a thirty-ninth capacitor C30, thirty-ninth to forty-sixth resistors R39 to R46, a third diode D3, a fourth diode D4, a second comparator U12, and a second analog-to-digital conversion chip U13; wherein the second comparator U12 is an LM393 comparator, the second analog-to-digital conversion chip U13 is a 74HC74 chip, one end of the twenty-ninth capacitor C29 is connected to an output end (refer to fig. 7, i.e., an output end of the fourth operational amplifier U9) A2B of the second filter amplifying circuit, the other end of the twenty-ninth capacitor C29 is connected to one end of the thirty-ninth resistor R39 and one end of the fortieth resistor R40, the other end of the thirty-ninth resistor R39 is grounded, the other end of the fortieth resistor R40 is connected to an anode of the third diode D3, a cathode of the fourth diode D4, and an inverting input end of the second comparator U12, the cathode of the third diode D3 is connected to the anode of the fourth diode D4 and then grounded, one end of the fortieth resistor R41 is connected to an external-4.6V power supply, the other end of the forty-first resistor R41 is respectively connected with one end of a forty-second resistor R42, one end of a thirty-first capacitor C30, one end of a forty-third resistor R43 and the non-inverting input end of the second comparator U12, the other end of the forty-second resistor R42 is grounded, the other end of the thirty-first resistor C30 is respectively connected with the other end of the forty-third resistor R43, the output end of the second comparator U12, one end of a forty-fourth resistor R44 and one end of a forty-fifth resistor R45, the other end of the forty-fourth resistor R44 is connected with an external 5V power supply, and the other end of the forty-fifth resistor R45 is respectively connected with the data input end D (refer to FIG. 8) of the first analog-digital conversion chip U11, one end of the forty-sixth resistor R46 and the reset end of the second analog-digital conversion chip U13>The other end of the forty-sixth resistor R46 is connected with the clock signal input end CLK of the second analog-digital conversion chip U13, and the Q output end of the second analog-digital conversion chip U13 is connected with the main control module. The positive power input ends of the first comparator U10 and the second comparator U12 are connected with an external 5V power supply, and the negative power input ends are respectively grounded. A2B ultrasonic detection analog signal output by the second filtering and amplifying circuit is output after waveform shaping and analog-to-digital conversion by the first analog-to-digital conversion moduleAnd the second analog-to-digital conversion module performs waveform shaping and analog-to-digital conversion on the A1B ultrasonic detection analog signal output by the first filtering and amplifying circuit and outputs the signal to the main control module. As shown in fig. 10, the main control module U14 includes an STM32F103R8T6 chip, and the connection relationship of the pins thereof is shown in the figure, and the forward and backward data information of the detected blood flow can be known by receiving the backward blood flow signal transmitted from the first signal flow output submodule and the forward blood flow signal transmitted from the second signal flow output submodule.
In summary, the ultrasonic detection device with the blood flow direction detection function disclosed by the application is characterized in that the ultrasonic detection module is arranged to emit a first ultrasonic detection analog signal, and receives a second ultrasonic detection analog signal formed by reflecting the first ultrasonic detection analog signal after blood, and then the second ultrasonic detection analog signal is connected to the first frequency division circuit and the second frequency division circuit respectively, the demodulation signal of the first frequency division circuit and the modulation signal of the ultrasonic emission circuit are the same signals, the demodulation signal of the second frequency division circuit is a signal which is 90 degrees different from the modulation signal of the ultrasonic emission circuit in phase, the received second ultrasonic detection analog signal is shunted by 2 paths of demodulation signals which are 90 degrees different in phase, and then the signals are respectively filtered, amplified and converted into ultrasonic detection digital signals, so that blood flow direction signals in the forward direction and the backward direction can be respectively obtained, and finally the blood flow direction signals are output to the main control module, and the effective and reliable blood flow direction data can be obtained, and the technical problems that the ultrasonic detection device in the prior art can not effectively and reliably detect the blood flow direction can be solved.
While the preferred embodiment of the present application has been described in detail, the present application 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 application, and the equivalent modifications or substitutions are included in the scope of the present application as defined in the appended claims.
Claims (5)
1. An ultrasonic detection device with a blood flow direction detection function, characterized by comprising:
the ultrasonic detection module is used for transmitting a first ultrasonic detection analog signal and receiving a second ultrasonic detection analog signal formed by reflecting the first ultrasonic detection analog signal after blood passing;
the blood flow signal branching module is used for respectively carrying out branching output processing on the second ultrasonic detection analog signals received by the ultrasonic detection module by utilizing 2 paths of demodulation signals;
the blood flow flows to the processing module; the blood flow signal branching module is used for processing the ultrasonic detection analog signals outputted by the blood flow signal branching module and outputting ultrasonic detection digital signals;
the main control module is used for receiving and processing and analyzing the ultrasonic detection digital signals to acquire blood flow direction data information;
the ultrasonic detection module comprises an ultrasonic probe, and the ultrasonic probe comprises an ultrasonic wave generating circuit, an ultrasonic wave receiving resonant circuit and an ultrasonic wave transmitting circuit; the output end of the ultrasonic receiving resonant circuit is connected with the input end of the blood flow signal branching module, and the output end of the ultrasonic generating circuit is respectively connected with the input end of the ultrasonic transmitting circuit and the input end of the blood flow signal branching module;
the blood flow signal branching module comprises a first frequency dividing circuit and a second frequency dividing circuit; the first output end of the ultrasonic wave generating circuit is connected with the first input end of the first frequency dividing circuit, the output end of the ultrasonic wave receiving resonant circuit is connected with the second input end of the first frequency dividing circuit, the output end of the first frequency dividing circuit is connected with the first input end of the blood flow direction processing module, the second output end of the ultrasonic wave generating circuit is connected with the first input end of the second frequency dividing circuit, the output end of the ultrasonic wave receiving resonant circuit is connected with the second input end of the second frequency dividing circuit, and the output end of the second frequency dividing circuit is connected with the second input end of the blood flow direction processing module;
the blood flow direction processing module comprises a first blood flow direction processing sub-module and a second blood flow direction processing sub-module; the first blood flow direction processing submodule comprises a first filtering amplifying circuit and a first analog-to-digital conversion circuit, wherein the output end of the first frequency dividing circuit is connected with the input end of the first filtering amplifying circuit, the output end of the first filtering amplifying circuit is connected with the input end of the first analog-to-digital conversion circuit, and the output end of the first analog-to-digital conversion circuit is connected with the input end of the main control module; the second blood flow direction processing submodule comprises a second filtering amplifying circuit and a second analog-to-digital conversion circuit, wherein the output end of the second frequency dividing circuit is connected with the input end of the second filtering amplifying circuit, the output end of the second filtering amplifying circuit is connected with the input end of the second analog-to-digital conversion circuit, and the output end of the second analog-to-digital conversion circuit is connected with the input end of the main control module.
2. The ultrasonic detection device with a blood flow direction detection function according to claim 1, wherein the first frequency dividing circuit includes: the second resistor, the third resistor, the fourth resistor, the fifth capacitor, the sixth capacitor, the second inductor and the second triode; one end of the fourth resistor is connected with the first output end of the ultrasonic wave generating circuit, the other end of the fourth resistor is connected with one end of the sixth capacitor, the other end of the sixth capacitor is connected with one end of the third resistor and the base electrode of the second triode respectively, the emitter of the second triode is connected with one end of the second inductor and the first output end of the ultrasonic wave receiving resonance circuit respectively, the other end of the second inductor is grounded, the other end of the third resistor is connected with the collector of the second triode, one end of the second resistor, one end of the fifth capacitor and the first input end of the blood flow direction processing module respectively, the other end of the second resistor is connected with an external 2V power supply, and the other end of the fifth capacitor is grounded.
3. The ultrasonic detection apparatus with a blood flow direction detection function according to claim 1 or 2, wherein the second frequency dividing circuit includes: a fifth resistor, a sixth resistor, a seventh capacitor, an eighth capacitor, a third triode, a third inductor and a third inverter; the input end of the third inverter is connected with the second output end of the ultrasonic wave generating circuit, the output end of the third inverter is connected with one end of the seventh resistor, the other end of the seventh resistor is connected with one end of the eighth capacitor, the other end of the eighth capacitor is connected with one end of the sixth resistor and the base electrode of the third triode respectively, the emitter electrode of the third triode is connected with one end of the third inductor and the second output end of the ultrasonic wave receiving resonant circuit respectively, the other end of the third inductor is grounded, the other end of the sixth resistor is connected with the collector electrode of the third triode, one end of the fifth resistor, one end of the seventh capacitor and the second input end of the blood flow direction processing module respectively, the other end of the fifth resistor is connected with an external 2V power supply, and the other end of the seventh capacitor is grounded.
4. The ultrasonic detection device with a blood flow direction detection function according to claim 1, wherein the first filter amplification circuit includes a first low-pass filter circuit, a first signal amplification circuit, and a first high-pass filter circuit; the output end of the first frequency division circuit is connected with the input end of the first low-pass filter circuit, the output end of the first low-pass filter circuit is connected with the input end of the first signal amplification circuit, the output end of the first signal amplification circuit is connected with the input end of the first high-pass filter circuit, and the output end of the first high-pass filter circuit is connected with the input end of the first analog-to-digital conversion circuit.
5. The ultrasonic detection device with a blood flow direction detection function according to claim 1 or 4, wherein the second filter amplification circuit includes a second low-pass filter circuit, a second signal amplification circuit, and a second high-pass filter circuit; the output end of the second frequency division 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 second signal amplifying circuit, the output end of the second signal amplifying circuit is connected with the input end of the second high-pass filter circuit, and the output end of the second high-pass filter circuit is connected with the input end of the second analog-to-digital conversion module.
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