Wearable ultrasonic Doppler blood flow detector and detection method

[0023] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0024] A wearable ultrasonic Doppler blood flow detector, including a wearable device, the wearable device includes an acquisition module, a signal processing module and a transmission module, the acquisition module is used to collect human blood flow velocity signals and pulse rate, and the signal processing module is used to Calculate and process the collected blood flow velocity signal and pulse rate to generate blood flow parameters, including blood viscosity, blood flow resistance index, blood flow pulsation index, blood flow impedance index, ankle brachial index and toe brachial index ; The transmission module is used to transmit the blood flow parameters to the smart terminal, and the smart terminal is used to display various detected blood flow parameters. Smart terminals can be mobile phones, tablets or laptops.

[0025] figure 1 It is a block diagram of a wearable ultrasonic Doppler blood flow detector circuit module of the present invention, refer to figure 1 , wearable devices include upper limb wearable devices and lower limb wearable devices,

[0026] Wherein, the upper limb wearable device includes a first acquisition module, a first signal processing module and a first transmission module, the first acquisition module includes a first ultrasonic transducer, a first ultrasonic transmitter and a first ultrasonic receiver, and the first ultrasonic transducer The transducer is respectively connected with the first ultrasonic transmitter and the first ultrasonic receiver, the input end of the first signal processing module is connected with the output end of the first ultrasonic receiver, the output end of the first signal processing module is connected with the first transmission module input connection. The first signal processing module includes a first MCU, a first signal amplifying circuit and a first signal shaping circuit, the output end of the first ultrasonic receiver is connected to the input end of the first signal amplifying circuit, and the output end of the first signal amplifying circuit is connected to the input end of the first signal amplifying circuit The input end of the first signal shaping circuit is connected, the output end of the first signal shaping circuit is connected with the input end of the first MCU, and the output end of the first MCU is connected with the first transmission module. In this embodiment, the first MCU adopts STM32 single-chip microcomputer, obviously, it can also be 51 series single-chip microcomputer, ARM series single-chip microcomputer and so on.

[0027] The lower extremity wearable device includes a second acquisition module, a second signal processing module, and a second transmission module. The second acquisition module includes a second ultrasonic transducer, a second ultrasonic transmitter, and a second ultrasonic receiver. The second ultrasonic transducer Connect with the second ultrasonic transmitter and the second ultrasonic receiver respectively, the input end of the second signal processing module is connected with the output end of the second ultrasonic receiver, the output end of the second signal processing module is connected with the input end of the second transmission module connected, the second transmission module communicates with the first transmission module and the smart terminal respectively. The second signal processing module includes a second MCU, a second signal amplifying circuit and a second signal shaping circuit, the output of the second ultrasonic receiver is connected to the input of the second signal amplifying circuit, and the output of the second signal amplifying circuit is connected to the input of the second signal amplifying circuit The input end of the second signal shaping circuit is connected, the output end of the second signal shaping circuit is connected with the input end of the second MCU, and the output end of the second MCU is connected with the first transmission module. In this embodiment, the second MCU adopts STM32 single-chip microcomputer, obviously, it can also be 51 series single-chip microcomputer, ARM series single-chip microcomputer and so on.

[0028] Specifically, both the first ultrasonic transmitter and the second ultrasonic transmitter can transmit ultrasonic signals of different frequencies according to actual needs; the first ultrasonic receiver and the second ultrasonic receiver are two-way receivers, which can be used to distinguish the flow of blood flow direction.

[0029] In this embodiment, both the first ultrasonic transducer and the second ultrasonic transducer use piezoelectric ceramic ultrasonic transducers, so as to realize unilaterally transmitting ultrasonic signals and unilaterally receiving ultrasonic signals.

[0030] Specifically, both the first signal shaping circuit and the second signal shaping circuit are used for filtering, network frequency selection and interference removal for the acquired blood flow signal.

[0031] In this embodiment, the first transmission module and the second transmission module preferably use Bluetooth, the upper limb wearable device is used to collect upper limb blood flow velocity signals, and then obtains upper limb blood flow parameter data, and the lower limb wearable device is used to collect lower limb blood flow velocity signals. Then obtain the blood flow parameter data of the lower limbs, the upper limb wearable device exchanges blood flow parameters with the second transmission module of the lower limb wearable device through the first transmission module, and the first MCU and the second MCU combine the blood flow parameter data of the upper limbs and the blood flow parameter data of the lower limbs Make a comprehensive judgment to make the test results more accurate.

[0032]Preferably, the wearable device for the upper limbs and the wearable device for the lower limbs are respectively provided with reminder lights, which are used to send out different light signals according to different blood flow parameters to prompt the health status of blood vessels. Specifically, the upper body wearable device includes a first three-color light group, the lower body wearable device includes a second three-color light group, and both the first three-color light group and the second three-color light group include red LED lights, yellow LED lights, and green LED lights. The lights correspond to the three levels of severe abnormality of blood vessels, slight abnormality of blood vessels and normal blood vessels, which is convenient for users to intuitively check their own blood vessel health status. At the same time, the user can also communicate with the wearable device through the smart terminal to obtain and view various blood flow parameters detected.

[0033] A wearable ultrasonic Doppler blood flow detection method, applied to a wearable ultrasonic Doppler blood flow detector as described above, the method includes steps:

[0034] S1, acquiring a blood flow velocity signal and a pulse rate;

[0035] Specifically, the ultrasound Doppler principle is used to obtain the blood flow velocity signal and the pulse rate in combination with the ultrasound transmitter, the ultrasound transducer and the ultrasound receiver.

[0036] S2, calculate the target blood flow parameters according to the obtained blood flow velocity signal, the target blood flow parameters include blood viscosity, blood flow resistance index, blood flow pulsation index, blood flow impedance index, ankle brachial index and toe brachial index ;

[0037] Specifically, the obtained blood flow velocity signal is preprocessed, and the preprocessing includes amplifying and shaping the acquired blood flow velocity signal, converting it into a digitally quantified blood flow velocity signal through AD, and calculating the Target blood flow parameters; or pre-establish a correspondence table between blood flow velocity values ​​and blood flow parameters, and search the actually acquired blood flow velocity values ​​to obtain corresponding target blood flow parameters according to the correspondence table.

[0038] Specifically, in this embodiment, the target blood flow parameters include blood viscosity, blood flow resistance index, blood flow pulsation index, blood flow impedance index, ankle-brachial index, and toe-brachial index.

[0039] Wherein, the calculating formula of blood viscosity η is:

[0040] η=(F/S)·(dL/dv) (1)

[0041] F/S is the shear stress, dv is the blood flow velocity, and dL is the distance of the blood flow within the time t from ultrasonic emission to ultrasonic reception.

[0042] The formula for calculating the blood flow resistance index RI is:

[0043] RI=Vs—Vd/Vs (2)

[0044] Vs is the peak systolic blood flow velocity, and Vd is the end-diastolic blood flow velocity.

[0045] The formula for calculating the pulsatility index PI is:

[0046] PI=Vs-Vd/Vm (3)

[0047] Vs is the peak systolic blood flow velocity, Vd is the end-diastolic blood flow velocity, and Vm is the mean blood flow velocity.

[0048] The formula for calculating the blood flow impedance index S/D is:

[0049] S/D=Vs/Vd (4)

[0050] Vs is the peak systolic blood flow velocity, and Vd is the end-diastolic blood flow velocity.

[0051] The blood flow velocity signal includes the upper limb blood flow velocity signal and the lower limb blood flow velocity signal. According to the upper limb blood flow velocity signal and the lower limb blood flow velocity signal, the ankle-brachial index ABI and the toe-brachial index TBI can be calculated respectively. The ankle-brachial index ABI is the brachial artery The ratio of systolic blood pressure to ankle arterial systolic pressure, toe brachial index TBI is the ratio of toe arterial systolic pressure to brachial arterial systolic pressure.

[0052] S3, analyzing and judging the health of blood vessels according to the calculated target blood flow parameters.

[0053] Specifically, the standard range of each blood flow parameter is preset, and it is judged whether the calculated target blood flow parameters exceed the corresponding parameter standard range, that is, blood viscosity, blood flow resistance index, blood flow pulsation index, and blood flow impedance index are judged. , whether the ankle-brachial index and toe-brachial index exceed the preset parameter standard range, if so, it is judged that the blood vessel is abnormal, otherwise, it is judged that the blood vessel is healthy.

[0054] A wearable ultrasonic Doppler blood flow detection method adopts the principle of ultrasonic Doppler to complete the detection of blood flow velocity, pulse rate and blood viscosity during the wearing process of the user. The blood flow parameters are transmitted to the smart terminal to analyze and judge the health status of blood vessels, which is convenient for users to monitor the health status of blood vessels in real time and reduce the risk of disease.

[0055] The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the described embodiments, and those skilled in the art can also make various equivalent deformations or replacements without violating the spirit of the present invention. These equivalent modifications or replacements are all within the scope defined by the claims of the present application.