Ultrasonic blood flow sensor based on temperature compensation

Abstract

The invention provides an ultrasonic blood flow sensor based on temperature compensation, and relates to the field of medical instruments. The ultrasonic blood flow sensor based on temperature compensation comprises an ultrasonic probe assembly, a temperature sensor and a detection circuit, and the ultrasonic probe assembly is used for emitting ultrasonic waves to an extracorporeal circulation pipeline and receiving the ultrasonic waves penetrating through the extracorporeal circulation pipeline. According to the ultrasonic blood flow sensor based on temperature compensation, the problem that the measurement precision is reduced due to blood temperature changes can be effectively solved, and the ultrasonic blood flow sensor based on temperature compensation can be applied to application scenes such as extracorporeal circulation operations, such as the ECMOs process. Accurate blood flow monitoring is crucial to adjustment of ECMO system parameters, optimization of membrane lung oxygenation effect and guarantee of patient treatment effect. The sensor can provide high-precision and reliable blood flow data and help a doctor to more accurately evaluate the extracorporeal circulation state of a patient, so that a more accurate medical decision is made, and the treatment success rate is increased.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to an ultrasonic blood flow sensor based on temperature compensation. Background Art

[0002] During extracorporeal circulation surgery, such as extracorporeal membrane oxygenation (ECMO), monitoring the blood flow in the circulation circuit can better adjust the parameters of the ECMO system and optimize the oxygenation effect of the membrane lung. During treatment, it can better eliminate carbon dioxide in the patient's body and provide the patient with sufficient oxygen.

[0003] An ultrasonic flow sensor is a device that uses the piezoelectric effect to measure fluid flow in a non-invasive manner through methods such as the time difference method and the phase difference method. It is particularly suitable for blood flow measurement scenarios with high requirements for hygiene and cleanliness.

[0004] Since blood is a non-Newtonian fluid, its flow rate is significantly affected by viscosity, such as Figure 1 As shown, when the blood temperature decreases, the blood viscosity tends to increase. The change in blood viscosity will cause the change in blood density. The two are in direct proportion. When using ultrasound to measure fluid flow rate, the following formula is used: Where ∆t is the time difference between the downstream and upstream propagation times of ultrasound in the fluid; c is the propagation speed of ultrasound in the liquid; l is the sound path; and θ is the installation angle of the ultrasonic probe.

[0005] As liquid temperature rises, its viscosity and density decrease, and the propagation speed of ultrasound waves in the liquid increases. According to the above formula, when using an ultrasonic sensor to measure blood flow, it is affected by blood temperature, and the flow rate is directly proportional to blood temperature. Conventional ultrasonic flow sensors can produce a deviation between the blood flow measured and the actual flow rate. For example, in ECMO, this can lead doctors to misjudge the extracorporeal membrane oxygenation status, affecting the patient's treatment outcome. Summary of the Invention

[0006] The present invention provides an ultrasonic blood flow sensor based on temperature compensation, which is used to solve the problem of low measurement accuracy of existing ultrasonic sensors.

[0007] The present invention provides an ultrasonic blood flow sensor based on temperature compensation, comprising: an ultrasonic probe assembly, the ultrasonic probe assembly being used to transmit ultrasonic waves to an extracorporeal circulation circuit and receive ultrasonic waves passing through the extracorporeal circulation circuit; a temperature sensor, the temperature sensor being used to detect the temperature of the blood in the extracorporeal circulation circuit and convert the temperature into a temperature signal; A detection circuit is electrically connected to the ultrasound probe assembly and the temperature sensor. The detection circuit is used to calculate the blood flow value in the extracorporeal circulation circuit based on the propagation time of the ultrasound wave in the blood, and to perform temperature compensation on the blood flow value based on the temperature value obtained by the temperature sensor to obtain a compensated flow value.

[0008] According to an ultrasonic blood flow sensor based on temperature compensation provided by the present invention, the ultrasonic probe assembly includes: Two ultrasonic probes are respectively arranged on both sides of the extracorporeal circulation pipeline. Both ultrasonic probes are electrically connected to the detection circuit. The ultrasonic probe is used to transmit ultrasonic waves and also to receive ultrasonic waves transmitted by the other ultrasonic probe and convert the received ultrasonic waves into ultrasonic signals.

[0009] According to an ultrasonic blood flow sensor based on temperature compensation provided by the present invention, the detection circuit includes: a temperature detection circuit, the temperature detection circuit being electrically connected to the temperature sensor, the temperature detection circuit being configured to filter the temperature signal and convert the filtered temperature signal into a digital temperature signal; an ultrasonic excitation circuit, the ultrasonic excitation circuit being electrically connected to one of the ultrasonic probes and configured to drive the ultrasonic probe to emit ultrasonic waves; a flow detection circuit, the flow detection circuit being electrically connected to the other ultrasonic probe, the flow detection circuit being configured to acquire the ultrasonic signal received by the other ultrasonic probe and convert the ultrasonic signal into a digital ultrasonic signal; A processor circuit is electrically connected to the temperature detection circuit, the ultrasonic excitation circuit, and the flow detection circuit. The processor circuit is used to process the digital ultrasonic signal and calculate the blood flow value in the extracorporeal circulation circuit, then calculate the blood temperature value based on the digital temperature signal, compare the blood temperature value with a predetermined temperature to calculate the temperature difference, and when the temperature difference is greater than a preset value, perform temperature compensation on the blood flow value to obtain the compensated flow value.

[0010] According to the ultrasonic blood flow sensor based on temperature compensation provided by the present invention, the range of the preset value is -0.5°C to +0.5°C.

[0011] According to the temperature-compensated ultrasonic blood flow sensor provided by the present invention, the predetermined temperature is 36.5°C-37.5°C.

[0012] According to the ultrasonic blood flow sensor based on temperature compensation provided by the present invention, the detection circuit further includes: A display component is electrically connected to the processor circuit, and is used to display the compensated flow value and / or the blood temperature value output by the processor circuit.

[0013] According to the ultrasonic blood flow sensor based on temperature compensation provided by the present invention, the detection circuit further includes: A wireless communication module is electrically connected to the processor circuit and is used to communicate with a user terminal.

[0014] An ultrasonic blood flow sensor based on temperature compensation according to the present invention further includes: The shell includes a main shell, the main shell is provided with a positioning groove, the positioning groove forms a notch on one side of the main shell, the two ultrasonic probes are respectively arranged on the two side walls of the positioning groove, and the temperature sensor is arranged on the bottom wall of the positioning groove.

[0015] According to the ultrasonic blood flow sensor based on temperature compensation provided by the present invention, the housing further includes: A cover body is covered on the notch and connected to the main shell.

[0016] According to the present invention, an ultrasonic blood flow sensor based on temperature compensation is provided, which includes two temperature sensors, one of which is arranged on the bottom wall of the positioning groove, and the other temperature sensor is arranged on the side of the cover body facing the extracorporeal circulation pipeline.

[0017] The temperature-compensated ultrasonic blood flow sensor provided by the present invention transmits ultrasonic waves into the extracorporeal circulation circuit via an ultrasonic probe assembly and receives the ultrasonic waves that have passed through the circuit. A temperature sensor detects the temperature of the blood within the circuit and converts the temperature into a temperature signal. A detection circuit calculates the blood flow within the circuit based on the propagation time of the ultrasonic waves in the blood, and temperature-compensates the blood flow based on the temperature value obtained by the temperature sensor to obtain a compensated flow value. The temperature-compensated ultrasonic blood flow sensor of the present invention effectively avoids the problem of decreased measurement accuracy caused by changes in blood temperature. In applications such as extracorporeal circulation surgery, such as extracorporeal membrane oxygenation (ECMO), accurate blood flow monitoring is crucial for adjusting ECMO system parameters, optimizing membrane oxygenation effectiveness, and ensuring patient treatment outcomes. The sensor provides highly accurate and reliable blood flow data, helping doctors more accurately assess a patient's extracorporeal circulation status, leading to more precise medical decisions and improved treatment success rates. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the relationship between blood temperature and blood viscosity in the prior art.

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the ultrasonic blood flow sensor based on temperature compensation provided by the present invention.

[0021] Figure 3 This is one of the side cross-sectional structural schematic diagrams of the temperature-compensated ultrasonic blood flow sensor provided by the present invention.

[0022] Figure 4 It is a structural diagram of the detection circuit provided by the present invention.

[0023] Figure 5 This is the second schematic side cross-sectional structure diagram of the temperature-compensated ultrasonic blood flow sensor provided by the present invention.

[0024] Reference numerals: 100. Ultrasonic probe assembly; 101. Ultrasonic probe; 110. Temperature sensor; 120. Detection circuit; 121. Temperature detection circuit; 122. Ultrasonic excitation circuit; 123. Flow detection circuit; 124. Processor circuit; 125. Display assembly; 130. Extracorporeal circulation circuit; 141. Main shell; 142. Cover. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0026] The following combination Figure 2-Figure 5 The specific structure and working principle of the ultrasonic blood flow sensor based on temperature compensation of the present invention are described.

[0027] Figure 2 The schematic diagram of the three-dimensional structure of the ultrasonic blood flow sensor based on temperature compensation provided by the present invention is illustrated. Figure 3 One of the schematic side cross-sectional structures of the temperature-compensated ultrasonic blood flow sensor provided by the present invention is illustrated, as shown in FIG. Figure 2 and Figure 3 As shown, the temperature-compensated ultrasonic blood flow sensor includes an ultrasonic probe assembly 100, a temperature sensor 110, and a detection circuit 120. The ultrasonic probe assembly 100 is used to transmit ultrasonic waves to an extracorporeal circulation circuit 130 and receive ultrasonic waves that pass through the extracorporeal circulation circuit 130. The temperature sensor 110 is used to detect the temperature of the blood in the extracorporeal circulation circuit 130 and convert the temperature value into a temperature signal. The detection circuit 120 is electrically connected to the ultrasonic probe assembly 100 and the temperature sensor 110. The detection circuit 120 is used to calculate the blood flow value in the extracorporeal circulation circuit 130 based on the propagation time of the ultrasonic wave in the blood, and to perform temperature compensation on the blood flow value based on the temperature value obtained by the temperature sensor 110 to obtain a compensated flow value.

[0028] The temperature-compensated ultrasonic blood flow sensor provided by the present invention transmits ultrasonic waves to an extracorporeal circulation circuit 130 through an ultrasonic probe assembly 100 and receives the ultrasonic waves that have passed through the circuit 130. A temperature sensor 110 detects the temperature of the blood within the circuit 130 and converts the temperature into a temperature signal. A detection circuit 120 calculates the blood flow within the circuit 130 based on the propagation time of the ultrasonic waves in the blood. The blood flow value is temperature-compensated based on the temperature value obtained by the temperature sensor 110 to obtain a compensated flow value. The temperature-compensated ultrasonic blood flow sensor of the present invention effectively avoids the problem of decreased measurement accuracy caused by changes in blood temperature. In applications such as extracorporeal circulation surgery, such as extracorporeal membrane oxygenation (ECMO), accurate blood flow monitoring is crucial for adjusting ECMO system parameters, optimizing membrane oxygenation efficiency, and ensuring patient treatment outcomes. The sensor provides highly accurate and reliable blood flow data, helping physicians more accurately assess a patient's extracorporeal circulation status, leading to more precise medical decisions and improved treatment success rates.

[0029] In one embodiment of the present invention, Figure 3 As shown, the ultrasound probe assembly 100 includes two ultrasound probes 101, which are respectively arranged on both sides of the extracorporeal circulation circuit 130. The two ultrasound probes 101 are electrically connected to the detection circuit 120. The ultrasound probe 101 is used to transmit ultrasound waves and also to receive ultrasound waves transmitted by another ultrasound probe 101 and convert the received ultrasound waves into ultrasound signals. Such a layout design ensures that ultrasound waves can effectively pass through the blood in the extracorporeal circulation circuit 130.

[0030] To ensure measurement accuracy, the installation positions of the two ultrasound probes 101 must be precisely aligned. This precise alignment is crucial because it is directly related to whether the ultrasonic signal can accurately pass through the extracorporeal circulation circuit 130 and be reliably captured by the ultrasound probe 101 at the receiving end. Any position deviation may result in weakened signal strength, signal distortion, or no signal at all, thereby affecting the accuracy of flow measurement.

[0031] Furthermore, during use, the two ultrasonic probes 101 need to be fixed so that the distance between the two ultrasonic probes 101 is a fixed value. This fixed distance relationship is of great significance for ultrasonic flow measurement. In ultrasonic flow measurement technology, especially measurement methods based on the time difference method or phase difference method, the propagation time difference or phase difference of ultrasonic waves in the fluid is closely related to the flow rate of the fluid. Only when the position and distance of the ultrasonic probes 101 remain constant can the consistency of the ultrasonic propagation path be ensured during the measurement process, thereby ensuring that the measured time difference or phase difference accurately reflects the actual flow rate of the blood. In addition, the fixed probe position also helps to reduce interference with the measurement caused by external factors; for example, it avoids signal instability or measurement errors caused by loose probes or position offsets.

[0032] In one embodiment of the present invention, Figure 4 The structural diagram of the detection circuit provided by the present invention is illustrated as follows: Figure 4 As shown, the detection circuit 120 includes a temperature detection circuit 121, an ultrasonic excitation circuit 122, a flow detection circuit 123 and a processor circuit 124. The temperature detection circuit 121 is electrically connected to the temperature sensor 110. The temperature detection circuit 121 is used to filter the temperature signal and convert the filtered temperature signal into a digital temperature signal.

[0033] Specifically, the temperature detection circuit 121 includes a signal receiving and processing circuit and an analog-to-digital conversion circuit. The signal receiving and processing circuit is electrically connected to the temperature sensor 110 and is responsible for receiving the temperature signal output by the temperature sensor 110. The temperature sensor 110 typically outputs an analog signal, which may contain various frequency components. These signals include not only valid signals reflecting changes in blood temperature, but also interference signals from the environment or other electronic devices.

[0034] To improve signal quality, the signal receiving and processing circuitry employs filtering techniques to retain signals within a specific frequency range, typically corresponding to the normal rate of change in blood temperature. For example, given the physiological range of human temperature and the temperature regulation rate within an extracorporeal circulation system, the signal receiving and processing circuitry may be configured to allow low-frequency signals to pass while suppressing or attenuating high-frequency noise. This filtering effectively improves the signal-to-noise ratio, making subsequent signal processing more accurate and thus enhancing the sensor's detection precision.

[0035] The analog-to-digital conversion circuit is electrically connected to the signal receiving and processing and processor circuit 124. The temperature signal after filtering is still an analog signal. The analog-to-digital conversion circuit is used to convert these analog signals into digital temperature signals. The digital temperature signals are easier to be processed and analyzed by the processor circuit 124 and are less susceptible to interference during transmission and storage.

[0036] The ultrasonic excitation circuit 122 is electrically connected to one ultrasonic probe 101 and is used to drive the ultrasonic probe 101 to emit ultrasonic waves. The flow detection circuit 123 is electrically connected to the other ultrasonic probe 101 and is used to obtain the ultrasonic signal received by the other ultrasonic probe 101 and convert the ultrasonic signal into a digital ultrasonic signal.

[0037] Specifically, the processor circuit 124 outputs an ultrasonic frequency excitation signal, and the ultrasonic excitation circuit 122 converts the excitation signal into an AC signal to drive the ultrasonic sensor probes. One ultrasonic probe 101 transmits ultrasonic waves, while the other ultrasonic probe 101 receives the ultrasonic signals and sends them to the flow detection circuit 123 for processing. The flow detection circuit 123 includes a signal receiving and processing circuit and a time-to-digital conversion circuit. The signal receiving and processing circuit first filters the ultrasonic signal and then amplifies it to obtain an accurate echo waveform. The time-to-digital conversion circuit then calculates the propagation time of the ultrasonic wave in the blood, converts this time information into a digital ultrasonic signal, and transmits it to the processor circuit 124 to calculate the untemperature-compensated blood flow.

[0038] The processor circuit 124 is electrically connected to the temperature detection circuit 121, the ultrasonic excitation circuit 122 and the flow detection circuit 123. The processor circuit 124 is used to process the digital ultrasonic signal and calculate the blood flow value in the extracorporeal circulation circuit 130, and then calculate the blood temperature value based on the digital temperature signal, and compare the blood temperature value with the predetermined temperature to calculate the temperature difference. When the temperature difference is greater than the preset value, the blood flow value is temperature compensated to obtain the compensated flow value.

[0039] Specifically, the processor circuit 124 is the core control unit of the entire ultrasonic blood flow sensor. The processor circuit 124 first receives the digital ultrasonic signal from the flow circuit detection. The digital ultrasonic signal contains the time information of the ultrasonic wave propagating in the blood. The processor circuit 124 deeply processes the digital ultrasonic signal through the built-in algorithm, and uses the time difference method combined with the installation angle, sound range and other parameters of the ultrasonic probe 101 to accurately calculate the blood flow value in the extracorporeal circulation pipeline 130. This flow value is a preliminary measurement value and does not consider the influence of temperature factors.

[0040] At the same time, the processor circuit 124 also receives a digital temperature signal from the temperature detection circuit 121. The digital temperature signal reflects the blood temperature of the blood in the extracorporeal circulation circuit 130. The processor circuit 124 analyzes the digital temperature signal, calculates the blood temperature, and compares the blood temperature with a predetermined temperature to calculate a temperature difference.

[0041] When the calculated temperature difference exceeds a preset temperature compensation threshold (e.g., -0.5°C to +0.5°C), processor circuit 124 initiates a temperature compensation process to accurately compensate the initial flow rate value, ultimately obtaining a flow rate value that truly reflects the actual blood flow. This temperature compensation process effectively eliminates measurement errors caused by blood temperature fluctuations, ensuring that the sensor can output highly accurate and reliable blood flow data under different temperature conditions. This provides medical staff with accurate monitoring information, assisting them in making more precise medical decisions, and improving treatment effectiveness and patient safety in applications such as extracorporeal circulation surgery.

[0042] It should be noted that the preset value ranges from -0.5°C to +0.5°C, and the predetermined temperature is 36.5°C-37.5°C. Preferably, the predetermined temperature is 37°C. Of course, the preset temperature is not limited thereto and may be other temperatures.

[0043] In one embodiment of the present invention, Figure 4 As shown, the detection circuit 120 also includes a display component 125, which is electrically connected to the processor circuit 124. The display component 125 is used to display the compensated flow value and / or blood temperature value output by the processor circuit 124. In complex medical scenarios such as extracorporeal circulation surgery, medical staff often need to pay attention to multiple parameters at the same time. Therefore, the display component 125 can flexibly configure display modes, such as displaying the compensated flow value and blood temperature value on a single interface, or switching to display key information based on the medical staff's operation, thereby realizing centralized control of key data.

[0044] In one embodiment of the present invention, the detection circuit 120 also includes a wireless communication module, which is electrically connected to the processor circuit 124. The wireless communication module is used to communicate with the user terminal. After the processor circuit 124 completes the temperature compensation calculation of the blood flow value and the detection of the blood temperature value, these key data are packaged and encoded and sent out through the wireless communication module. On the user terminal, specially developed supporting software can receive the data transmitted by the wireless communication module, decode and analyze it, and display the compensated flow value and blood temperature value on the screen in real time in the form of intuitive charts, numbers, etc. At the same time, these data will also be stored in the local memory of the user terminal or in a cloud database, making it convenient for medical staff to access historical data at any time, perform data comparison and analysis, and generate detailed monitoring reports.

[0045] It should be noted here that the user terminal can be a smart device such as a smartphone, tablet computer, laptop computer, desktop computer, etc. used by medical staff on a daily basis, or it can be a hospital's central monitoring system or other medical information system.

[0046] In one embodiment of the present invention, Figure 3 As shown, the temperature-compensated ultrasonic blood flow sensor also includes a shell, which includes a main shell 141. The main shell 141 is a rectangular parallelepiped. Of course, the shape of the main shell 141 is not limited to this and can also be other shapes. The main shell 141 is provided with a positioning groove, the width of which is slightly greater than or equal to the diameter of the extracorporeal circulation pipeline 130. Such size matching ensures that the extracorporeal circulation pipeline 130 can be stably clamped in the positioning groove, avoiding measurement errors caused by shaking or displacement of the extracorporeal circulation pipeline 130 during the detection process. The notch formed by the positioning groove on the top of the main shell 141 provides a convenient operating interface for the installation and fixation of the extracorporeal circulation pipeline 130. Medical staff or equipment maintenance personnel can easily put in or take out the extracorporeal circulation pipeline 130. At the same time, the design of the notch also facilitates the cleaning or maintenance of the extracorporeal circulation pipeline 130 and the ultrasonic probe 101 when necessary.

[0047] The two ultrasonic probes 101 are respectively arranged on the two side walls of the positioning groove. This symmetrical arrangement ensures precise alignment between the ultrasonic probes 101. By respectively arranging the two ultrasonic probes 101 on the two side walls of the positioning groove, it is possible to maintain the distance between the two ultrasonic probes 101 at a fixed value, which is crucial for the accuracy of ultrasonic flow measurement, because the propagation time difference or phase difference of ultrasonic waves in the blood is directly related to the probe spacing, and any slight distance change may cause measurement errors. By fixing the ultrasonic probes 101 on the side walls of the positioning groove, the sensor can maintain stable measurement performance during long-term use, ensuring the reliability of flow data. The temperature sensor 110 is arranged on the bottom wall of the positioning groove. The bottom wall of the positioning groove is adjacent to the extracorporeal circulation pipeline 130, so that the temperature sensor 110 can directly contact or be close to the pipeline, thereby detecting temperature changes of the blood in real time and accurately.

[0048] In one embodiment of the present invention, Figure 2 and Figure 3 As shown, the housing also includes a cover 142, which is a rectangular plate. The cover 142 covers the notch. One side of the cover 142 is hinged to the main housing 141, and the other side of the cover 142 is provided with a latch. One side of the main housing 141 is provided with a buckle tongue, which engages with the latch tongue. Of course, the connection method between the cover 142 and the main housing 141 is not limited to this, and other connection methods can also be used. By making the cover 142 and the main housing 141 adopt a snap-fitting fit, not only is operation simple, but it can also ensure that the cover 142 remains in a stable closed state during normal operation of the device, preventing the cover 142 from loosening or opening due to accidental collisions or device vibrations, thereby protecting internal components from damage. By providing the cover 142, the cover 142 can limit the extracorporeal circulation pipeline 130 in the vertical direction, avoiding measurement errors caused by shaking or displacement of the extracorporeal circulation pipeline 130 during the detection process.

[0049] In one embodiment of the present invention, Figure 5 The second schematic diagram of the side cross-sectional structure of the temperature-compensated ultrasonic blood flow sensor provided by the present invention is illustrated. Figure 5 As shown, the temperature-compensated ultrasonic blood flow sensor includes two temperature sensors 110, one of which is disposed on the bottom wall of the positioning groove, and the other is disposed on the side of the cover 142 facing the extracorporeal circulation tubing 130. When the cover 142 is closed and locked, the temperature sensor 110 on the cover 142 can fit tightly against the outer surface of the extracorporeal circulation tubing 130. This direct contact ensures a rapid response of the temperature signal, as any slight temperature change is immediately captured by the temperature sensor 110 on the cover 142 and converted into an electrical signal. Furthermore, because the temperature sensor 110 on the cover 142 directly contacts the surface of the extracorporeal circulation tubing 130, without any excess insulation material or air gaps in between, this minimizes heat conduction delays and heat loss, thereby ensuring the accuracy of the measurement results.

[0050] The two sets of temperature sensors 110 work together to obtain more comprehensive blood temperature information, thereby improving the accuracy of temperature compensation. Specifically, due to the difference between the blood temperature measured at the top of the extracorporeal circulation tubing 130 and the blood temperature measured at the bottom of the extracorporeal circulation tubing 130, the blood temperature at the top of the extracorporeal circulation tubing 130 is measured by the temperature sensor 110 on the cover 142, and the blood temperature at the bottom of the extracorporeal circulation tubing 130 is measured by the temperature sensor 110 on the bottom wall of the positioning groove. After the processor circuit 124 receives the temperature data detected by these two temperature sensors 110, it uses the built-in algorithm to calculate the median of the current blood temperature. This median can more accurately reflect the actual temperature state of the blood in the extracorporeal circulation tubing 130 because it combines the temperature differences at the top and bottom. When the median of the current blood temperature differs from 37°C by more than ±0.5°C, the measured blood flow is temperature compensated to improve the sensor measurement accuracy. The design of this dual temperature sensor 110 not only improves the comprehensiveness and accuracy of temperature measurement, but also significantly enhances the adaptability and measurement accuracy of the ultrasonic blood flow sensor under different temperature conditions, ensuring that in key application scenarios such as extracorporeal circulation surgery, it can provide highly reliable blood flow data, assisting medical staff in making more accurate medical decisions.

[0051] In summary, the ultrasonic probe assembly 100 transmits ultrasonic waves to the extracorporeal circulation circuit 130 and receives the ultrasonic waves that have passed through the extracorporeal circulation circuit 130. The temperature sensor 110 detects the temperature of the blood in the extracorporeal circulation circuit 130 and converts the temperature value into a temperature signal. The detection circuit 120 calculates the blood flow value in the extracorporeal circulation circuit 130 based on the propagation time of the ultrasonic wave in the blood, and temperature-compensates the blood flow value based on the temperature value obtained by the temperature sensor 110 to obtain a compensated flow value. The temperature-compensated ultrasonic blood flow sensor of the present invention can effectively avoid the problem of decreased measurement accuracy caused by changes in blood temperature. In applications such as extracorporeal circulation surgery, such as extracorporeal membrane oxygenation (ECMO), accurate blood flow monitoring is crucial for adjusting ECMO system parameters, optimizing membrane oxygenation efficiency, and ensuring patient treatment outcomes. The sensor can provide highly accurate and reliable blood flow data, helping doctors more accurately assess a patient's extracorporeal circulation status, thereby making more precise medical decisions and improving treatment success rates.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An ultrasonic blood flow sensor based on temperature compensation, characterized in that: include: An ultrasonic probe assembly (100), the ultrasonic probe assembly (100) being used to transmit ultrasonic waves to an extracorporeal circulation line (130) and to receive ultrasonic waves that pass through the extracorporeal circulation line (130); A temperature sensor (110), the temperature sensor (110) is used to detect the temperature value of the blood in the extracorporeal circulation circuit (130) and convert the temperature value into a temperature signal; A detection circuit (120) is electrically connected to the ultrasound probe assembly (100) and the temperature sensor (110), and the detection circuit (120) is used to calculate the blood flow value in the extracorporeal circulation circuit (130) based on the propagation time of ultrasound in the blood, and to perform temperature compensation on the blood flow value based on the temperature value obtained by the temperature sensor (110) to obtain a compensated flow value.

2. The ultrasonic blood flow sensor based on temperature compensation according to claim 1, characterized in that: The ultrasound probe assembly (100) comprises: Two ultrasonic probes (101), the two ultrasonic probes (101) are respectively arranged on both sides of the extracorporeal circulation pipeline (130), the two ultrasonic probes (101) are electrically connected to the detection circuit (120), the ultrasonic probe (101) is used to transmit ultrasonic waves, and is also used to receive ultrasonic waves transmitted by the other ultrasonic probe (101), and convert the received ultrasonic waves into ultrasonic signals.

3. The temperature-compensated ultrasonic blood flow sensor according to claim 2, wherein: The detection circuit (120) comprises: a temperature detection circuit (121), the temperature detection circuit (121) being electrically connected to the temperature sensor (110), the temperature detection circuit (121) being used to filter the temperature signal and convert the filtered temperature signal into a digital temperature signal; An ultrasonic excitation circuit (122), the ultrasonic excitation circuit (122) being electrically connected to one of the ultrasonic probes (101), and the ultrasonic excitation circuit (122) being used to drive the ultrasonic probe (101) to emit ultrasonic waves; a flow detection circuit (123), the flow detection circuit (123) being electrically connected to the other ultrasonic probe (101), the flow detection circuit (123) being used to obtain the ultrasonic signal received by the other ultrasonic probe (101) and convert the ultrasonic signal into a digital ultrasonic signal; A processor circuit (124) is electrically connected to the temperature detection circuit (121), the ultrasonic excitation circuit (122), and the flow detection circuit (123). The processor circuit (124) is used to process the digital ultrasonic signal and calculate the blood flow value in the extracorporeal circulation circuit (130), and then calculate the blood temperature value based on the digital temperature signal, compare the blood temperature value with a predetermined temperature to calculate the temperature difference, and when the temperature difference is greater than a preset value, perform temperature compensation on the blood flow value to obtain the compensated flow value.

4. The temperature-compensated ultrasonic blood flow sensor according to claim 3, wherein: The preset value ranges from -0.5°C to +0.5°C.

5. The temperature-compensated ultrasonic blood flow sensor according to claim 3, wherein: The predetermined temperature is 36.5°C-37.5°C.

6. The temperature-compensated ultrasonic blood flow sensor according to any one of claims 3 to 5, characterized in that: The detection circuit (120) further includes: A display component (125) is electrically connected to the processor circuit (124), and the display component (125) is used to display the compensated flow value and / or the blood temperature value output by the processor circuit (124).

7. The temperature-compensated ultrasonic blood flow sensor according to any one of claims 3 to 5, characterized in that: The detection circuit (120) further includes: A wireless communication module is electrically connected to the processor circuit (124), and the wireless communication module is used to communicate with a user terminal.

8. The ultrasonic blood flow sensor based on temperature compensation according to any one of claims 2 to 5, characterized in that: Also includes: The shell comprises a main shell (141), the main shell (141) is provided with a positioning groove, the positioning groove forms a notch on one side of the main shell (141), the two ultrasonic probes (101) are respectively arranged on the two side walls of the positioning groove, and the temperature sensor (110) is arranged on the bottom wall of the positioning groove.

9. The ultrasonic blood flow sensor based on temperature compensation according to claim 8, characterized in that: The housing further comprises: A cover body (142) covers the notch and is connected to the main shell (141).

10. The ultrasonic blood flow sensor based on temperature compensation according to claim 9, characterized in that: The temperature-compensated ultrasonic blood flow sensor comprises two temperature sensors (110), wherein one of the temperature sensors (110) is arranged on the bottom wall of the positioning groove, and the other temperature sensor (110) is arranged on a side of the cover (142) facing the extracorporeal circulation pipeline (130).

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