Device and method for monitoring position of catheter pump and ventricular assist device

Abstract

The invention provides a position monitoring device and method of a catheter pump and a ventricular assist device, and relates to the field of medical instrument control. The position monitoring device comprises an environment monitoring module and a position detection module. The environment monitoring module is used for monitoring whether the environment of the conduit pump is abnormal or not according to the pressure difference of the conduit pump; wherein the pressure difference of the conduit pump represents the pressure difference between a fluid outlet and a fluid inlet of the conduit pump; and the position detection module is used for detecting the position of the conduit pump according to the fluid outlet pressure of the conduit pump under the condition that the environment monitoring module monitors that the environment of the conduit pump is abnormal. The fluid outlet uses the position monitoring device provided by the embodiment of the invention, whether the environment where the catheter pump of the ventricular assist device (VAD) is located is abnormal or not can be monitored in real time, specific abnormal conditions such as position errors or abnormal conditions of the intracardiac environment can be monitored in real time, and a foundation is laid for providing stable auxiliary flow for the ventricular assist device.

Description

Technical Field

[0001] This application relates to the field of medical device control, and more specifically, to a catheter pump position monitoring device, method, and ventricular assist device. Background Technology

[0002] Ventricular assist devices (VADs), including right ventricular assist devices (RVADs), left ventricular assist devices (LVADs), and biventricular assist devices (BiVADs), are medical devices that enable blood to be pumped from the heart and flow to all parts of the body, providing assistance to patients with heart disease. They are typically used as temporary support before heart transplantation or as a long-term treatment option, especially for patients awaiting a heart transplant or those unsuitable for heart transplantation.

[0003] Ventricular assist devices (VADs) include a catheter pump and a motor. The catheter pump is responsible for pumping blood from the heart and delivering it to the systemic circulation, while the motor provides mechanical energy to the catheter pump. During the process of providing auxiliary blood flow, due to the small size of the VAD, the catheter pump and motor are easily affected by the blood flow impact caused by the heart's pumping, or by excessively high motor speed, which can cause the catheter pump to shift position, thus affecting the effectiveness of the VAD.

[0004] Currently, the most common method for monitoring the position of catheter pumps is to use imaging equipment such as digital subtraction angiography or ultrasound to help doctors determine whether the position of the catheter pump is correct. Monitoring the position of the catheter pump through imaging medicine is highly dependent on imaging equipment, and prolonged use during surgery can be harmful to the human body. Summary of the Invention

[0005] The purpose of this application is to provide a catheter pump position monitoring device, method, and ventricular assist device. Using the position monitoring device provided in this application, it is possible to monitor in real time whether the environment of the catheter pump of the ventricular assist device is correct. When an abnormality is detected in the environment of the catheter pump of the ventricular assist device, it is possible to determine in detail whether the abnormality is caused by an incorrect position of the catheter pump or by an abnormal intracardiac environment, thus laying the foundation for providing a stable auxiliary flow for the ventricular assist device.

[0006] In a first aspect, embodiments of this application provide a position monitoring device for a duct pump. The position monitoring device includes an environmental monitoring module and a position detection module. The environmental monitoring module is used to monitor whether the environment in which the duct pump is located is abnormal based on the pressure difference of the duct pump. The pressure difference of the duct pump represents the pressure difference between the fluid outlet and the fluid inlet of the duct pump. The position detection module is used to detect the position of the duct pump based on the fluid outlet pressure of the duct pump when the environmental monitoring module detects that the environment in which the duct pump is located is abnormal.

[0007] In the above implementation process, the environmental monitoring module of the catheter pump position monitoring device provided in this application embodiment can initially determine whether the catheter pump is in the correct position by monitoring the real-time pressure difference. When the environmental monitoring module detects an abnormal environment in which the catheter pump is located, the position detection module can detect the position of the catheter pump based on the fluid outlet pressure of the catheter pump. Therefore, using the catheter pump position monitoring device provided in this application embodiment, the position of the catheter pump can be monitored in real time based on the pressure difference and the fluid outlet pressure of the catheter pump, thereby promptly detecting incorrect positioning of the catheter pump and low pulse conditions caused by cardiovascular abnormalities in the patient, ensuring the patient's life safety.

[0008] Optionally, in this embodiment of the application, when the environmental monitoring module detects an abnormal environment in which the duct pump is located, the position detection module is specifically used to: obtain the fluid outlet pressure difference based on the minimum and maximum fluid outlet pressures of the duct pump; determine whether the fluid outlet pressure difference is lower than the low pulsating pressure difference threshold; if the fluid outlet pressure difference is lower than the low pulsating pressure difference threshold, then determine that the duct pump is in a low pulsating environment.

[0009] Optionally, in this embodiment of the application, when the position detection module determines that the duct pump is in a low-pulsation environment, the position detection module is further configured to: determine the position of the duct pump based on the suction detection result; if the suction detection result indicates that suction has occurred, then the position of the duct pump is determined to be correct; if the suction detection result indicates that no suction has occurred, then the position of the duct pump is determined to be unknown.

[0010] In the above implementation process, the embodiments of this application determine whether the catheter pump is in a low-pulsation environment by detecting whether the fluid outlet pressure difference is lower than the low-pulsation pressure difference threshold, and can further combine with the aspiration detection module to determine whether the location of the catheter pump is unknown. This effectively addresses situations where the patient's blood vessels are in a low-pulsation state, such as when there is slight aspiration or weak pulsation, making it impossible to determine the location of the catheter pump using traditional pressure differences, thus avoiding incorrect location determination.

[0011] Optionally, in this embodiment of the application, before determining whether the fluid outlet pressure difference is lower than the low pulsating pressure difference threshold, the position detection module is further configured to: determine whether the fluid outlet pressure difference is higher than the ventricular pressure difference threshold and whether the minimum fluid outlet pressure is lower than the ventricular low pressure threshold; if the fluid outlet pressure difference is higher than the ventricular pressure difference threshold and the minimum fluid outlet pressure is lower than the ventricular low pressure threshold, then the catheter pump is determined to be located in the ventricle.

[0012] In the above implementation process, the catheter pump position monitoring method provided in this application embodiment, before determining whether the catheter pump is in a low-pulsation environment, accurately determines whether the catheter pump is located within the ventricle by judging whether the fluid outlet pressure difference is higher than the ventricular pressure difference threshold and combining this with whether the minimum fluid outlet pressure is lower than the ventricular hypotension threshold. The catheter pump position monitoring method provided in this application embodiment prioritizes detecting whether the catheter pump has shifted into the ventricle, as this can lead to dangerous situations such as ventricular structural damage, impaired pumping function, and arrhythmias. Therefore, timely identification of catheter pump displacement within the ventricle helps reduce patient risk, ensures timely intervention, and improves system safety and stability.

[0013] Optionally, in this embodiment of the application, when the environmental monitoring module detects an abnormal environment in which the catheter pump is located, during the process of detecting the position of the catheter pump based on the fluid outlet pressure of the catheter pump, the position detection module is further configured to: if the fluid outlet pressure difference is not lower than the low pulse pressure difference threshold, determine whether the catheter pump is located in the artery based on the fluid outlet pressure difference, the maximum fluid outlet pressure, and / or the minimum fluid outlet pressure.

[0014] Optionally, in this embodiment of the application, in the process of determining whether the catheter pump is located in the artery based on the fluid outlet pressure difference, the maximum fluid outlet pressure and / or the minimum fluid outlet pressure, the position detection module is specifically used to: determine whether the maximum fluid outlet pressure is higher than the arterial high pressure threshold and whether the minimum fluid outlet pressure is higher than the first arterial low pressure threshold; if the maximum fluid outlet pressure is higher than the arterial high pressure threshold and the minimum fluid outlet pressure is higher than the first arterial low pressure threshold, then it is determined that the catheter pump is located in the artery.

[0015] Optionally, in this embodiment of the application, in the process of determining whether the catheter pump is located in the artery based on the fluid outlet pressure difference, the maximum fluid outlet pressure and / or the minimum fluid outlet pressure, the position detection module is specifically used to: determine whether the fluid outlet pressure difference is within the range of arterial pressure difference and whether the minimum fluid outlet pressure is higher than the second arterial low pressure threshold; if the fluid outlet pressure difference is within the range of arterial pressure difference and the minimum fluid outlet pressure is higher than the second arterial low pressure threshold, then it is determined that the catheter pump is located in the artery.

[0016] Therefore, this application provides two methods for determining whether the catheter pump has shifted into the aorta. The position detection module can operate only one of these methods during the detection process, but combining both methods provides higher accuracy. The first method quickly and effectively determines whether the catheter pump is located within the artery by judging whether the maximum fluid outlet pressure is higher than the arterial high pressure threshold and whether the minimum fluid outlet pressure is higher than the arterial low pressure threshold. The second method achieves both accuracy and reliability in locating the catheter pump by judging whether the fluid outlet pressure difference is within the arterial pressure difference range and combining this with whether the minimum fluid outlet pressure is higher than a second arterial low pressure threshold. The two judgment methods provided in this application combine the pressure characteristics of the artery to ensure that the catheter pump can be accurately identified when it is in the aorta, avoiding potential complications caused by erroneous displacement of the catheter pump, helping to ensure the stable operation of the catheter pump, thereby improving patient safety and the effectiveness of the device.

[0017] Secondly, embodiments of this application provide a ventricular assist device, which includes a motor, a catheter pump, a sensor, and a catheter pump position monitoring device. The sensor is located near the fluid outlet of the catheter pump and is used to monitor the fluid outlet pressure of the catheter pump. The catheter pump position monitoring device is used to determine whether the environment in which the catheter pump is located is abnormal based on the motor speed and the motor current. The catheter pump position monitoring device is also used to detect the position of the catheter pump based on the fluid outlet pressure when the catheter pump position monitoring device detects an abnormal environment in which the catheter pump is located.

[0018] In the above implementation process, the ventricular assist device provided in this application includes a motor, a catheter pump, a sensor, and a catheter pump position monitoring device. The sensor is positioned near the flow outlet of the catheter pump to monitor the fluid outlet pressure. The catheter pump position monitoring device monitors the motor's rotational speed and current to determine if the environment in which the catheter pump is located is abnormal. When an abnormal environment is detected, the device can detect the position of the catheter pump based on the fluid outlet pressure, determining an incorrect position of the catheter pump or indicating that the patient is experiencing a low pulse. This ventricular assist device, combined with the function of the catheter pump position monitoring device, achieves accurate monitoring of the catheter pump's position and timely identification of incorrect positions, thereby improving the safety and reliability of the ventricular assist device.

[0019] Thirdly, embodiments of this application provide a method for monitoring the position of a duct pump. The method includes: determining the pressure difference of the duct pump based on the motor speed and motor current; wherein the motor drives the duct pump to work; determining whether the environment in which the duct pump is located is abnormal based on the pressure difference of the duct pump; and detecting the position of the duct pump based on the fluid outlet pressure of the duct pump when the environment in which the duct pump is located is determined to be abnormal.

[0020] In the above implementation process, this application also provides a method for monitoring the position of a catheter pump to ensure that the catheter pump of the ventricular assist device is always in the correct position. This method, by comprehensively considering the pressure differential and fluid outlet pressure of the catheter pump, can accurately identify incorrect positions of the catheter pump or indicate that the patient is currently in a low-pulsation state, thereby enabling timely intervention to ensure the normal operation of the cardiac assist device and the patient's safety.

[0021] Fourthly, embodiments of this application provide an electronic device, which includes a memory and a processor. The memory stores program instructions, and when the processor reads and runs the program instructions, it executes the steps in any of the above implementation methods.

[0022] Fifthly, embodiments of this application also provide a computer-readable storage medium storing computer program instructions, which, when read and executed by a processor, perform the steps in any of the above implementations. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a first schematic diagram of the module of the position monitoring device for the duct pump provided in the embodiments of this application;

[0025] Figure 2 A second schematic diagram of the module of the position monitoring device for the duct pump provided in the embodiments of this application;

[0026] Figure 3 A schematic diagram of the ventricular assist device provided in the embodiments of this application;

[0027] Figure 4 A flowchart of the position monitoring method for the duct pump provided in this application embodiment;

[0028] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0029] Icons: Catheter pump position monitoring device-100; Environmental monitoring module-110; Position detection module-120; Differential pressure monitoring module-130; Alarm module-140; Ventricular assist device-200; Motor-210; Catheter pump-220; Sensor-230; Electronic equipment-300; Processor-301; Memory-302. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. For example, the flowcharts and block diagrams in the drawings illustrate the architecture, functions, and operations of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagram may represent a module, program segment, or part of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or can be implemented using a combination of dedicated hardware and computer instructions. In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0031] A ventricular assist device (VAM) is a medical device that enables blood to be pumped from the heart and flow to various parts of the body, providing assistance to patients with heart disease. It is typically used as temporary support before heart transplantation or as a long-term treatment option, especially for patients awaiting a heart transplant or those unsuitable for transplantation. A VAM includes a catheter pump and a motor; the catheter pump pumps blood from the heart and delivers it to the systemic circulation, while the motor provides mechanical power to the pump.

[0032] During the provision of auxiliary blood flow by a ventricular assist device (VAP), the force of blood flow during a heartbeat may push the motor and catheter pump out of the VAP's designed position, causing them to drift into the artery instead of the correct location, resulting in a loss of auxiliary blood flow. In this case, the VAP motor is simultaneously located in both the ventricle and the artery, failing to effectively provide auxiliary blood flow. Additionally, if the VAP motor rotates at excessively high speeds, the pump may shift into the ventricle, causing the VAP to lose its intended auxiliary blood flow effect. In this situation, the VAP pump is no longer in the correct position and cannot effectively assist the heart in providing sufficient blood flow.

[0033] Currently, the most common method for monitoring the position of catheter pumps is to use imaging equipment such as digital subtraction angiography or ultrasound to assist doctors in determining whether the pump is in the correct position. The inventors' research found that monitoring the pump position via imaging medicine has two drawbacks: firstly, it relies heavily on imaging equipment, making long-term real-time monitoring impossible; secondly, due to the complexity of the heart and aortic valve structure, some locations may not be imaged by imaging equipment, thus the determination of the pump position by imaging equipment may not be accurate.

[0034] Furthermore, some existing technologies for monitoring the position of catheter pumps misjudge the location of the pump by directly interpreting abnormal physiological phenomena in the patient as displacement of the pump, thus leading to misjudgments of the pump's position and affecting the patient's experience.

[0035] Based on this, this application proposes a catheter pump position monitoring device, method, and ventricular assist device. The catheter pump position monitoring device, based on an environmental monitoring module and a position detection module, enables real-time monitoring of the ventricular assist device's catheter pump position, ensuring that the ventricular assist device provides stable flow assistance and reliably reducing patient safety threats caused by incorrect catheter pump position.

[0036] Please refer to Figure 1 , Figure 1 This is a first schematic diagram of the module of the position monitoring device for a duct pump provided in an embodiment of this application; this application provides a position monitoring device for a duct pump, the position monitoring device 100 of which includes: an environmental monitoring module 110 and a position detection module 120.

[0037] The environmental monitoring module 110 determines whether the environment in which the duct pump is located is abnormal based on the pressure difference across the duct pump.

[0038] The differential pressure of a duct pump refers to the difference between the pressure at the fluid outlet of the duct pump and the real-time pressure at the fluid inlet of the duct pump.

[0039] In this application embodiment, the abnormal environment of the catheter pump refers to the abnormal environment caused by the displacement of the catheter pump itself, or the abnormal environment caused by the patient's cardiovascular system. Specifically, the abnormal environment caused by the displacement of the catheter pump in this application includes situations where both the fluid outlet and fluid inlet of the catheter pump are located within the ventricle, or both the fluid outlet and fluid inlet of the catheter pump are located within the artery; the abnormal environment caused by the patient's cardiovascular system includes situations such as abnormal intracardiac environment or circulatory system abnormalities leading to low pulsatility.

[0040] The fact that both the fluid outlet and fluid inlet of the duct pump are located inside the ventricle may be due to the motor speed being too high, causing the entire pump body to shift towards the ventricle.

[0041] In cases where both the fluid outlet and inlet of the catheter pump are located in the aorta, it is possible that the large blood flow impact pushed the motor and pump body out of the valve, causing the entire catheter pump to shift towards the aorta.

[0042] There are many types of cardiovascular abnormalities, the two main categories being abnormalities of the intracardiac environment and abnormalities of the circulatory system. Intracardiac abnormalities include conditions such as aspiration, weak cardiac variability, heart failure, arrhythmia, or valvular disease; circulatory system abnormalities include conditions such as extremely low blood pressure, reduced blood volume, and poor peripheral circulation. These conditions can all lead to a significant decrease in pulse strength or pulse rate, making a normal pulse difficult to detect.

[0043] It is important to understand that because heartbeats cause periodic changes in vascular pressure or intraventricular pressure, if the ventricular assist device's catheter pump is in the correct position and there are no abnormalities in the cardiovascular system, the pressure differential monitored by the catheter pump will also change; therefore, the pressure differential can be used to determine whether the environment in which the catheter pump is located is abnormal.

[0044] The position detection module 120 is used to detect the position of the duct pump based on the fluid outlet pressure of the duct pump when the environmental monitoring module 110 detects an abnormal environment in which the duct pump is located.

[0045] If the environmental monitoring module 110 detects an abnormal environment for the ventricular assist device catheter pump, the position detection module 120 further detects the position of the catheter pump to determine whether the environmental abnormality is caused by the displacement of the catheter pump itself or by an abnormality in the patient's cardiovascular system.

[0046] During this process, it is necessary to take into account the pressure of the fluid outlet of the catheter pump. Due to the special structure of the catheter pump of the ventricular assist device, it is relatively easy to obtain the pressure of the fluid outlet. For example, a pressure sensor can be set up near the fluid outlet to obtain the real-time pressure of the fluid outlet.

[0047] It should be noted that, taking the left ventricle and aorta as examples, the pressure in the left ventricle typically varies between 0 and 120 mmHg, while the pressure in the aorta typically varies between 80 and 120 mmHg. Analysis shows that the pressure variation range in the left ventricle is much larger than that in the aorta, and the low pressure in the left ventricle is lower than that in the aorta. Therefore, monitoring the pressure at the fluid outlet can reveal its variations. Based on this pressure, it can be determined whether the abnormality in the catheter pump environment is caused by the fluid outlet and inlet of the catheter pump being located within the ventricle, or both being located within the artery, or by abnormalities in the patient's cardiovascular system, such as abnormal intracardiac environment or circulatory system, leading to a low pulsatility.

[0048] pass Figure 1 As can be seen, the environmental monitoring module 110 of the catheter pump position monitoring device provided in this application embodiment can initially determine whether the catheter pump is in the correct position by monitoring the real-time pressure difference. When the environmental monitoring module 110 detects an abnormal environment in which the catheter pump is located, the position detection module 120 can detect the position of the catheter pump based on the fluid outlet pressure of the catheter pump. Therefore, using the catheter pump position monitoring device provided in this application embodiment, the position of the catheter pump can be monitored in real time based on the pressure difference and the fluid outlet pressure of the catheter pump, thereby promptly detecting incorrect positioning of the catheter pump and low pulse conditions caused by cardiovascular abnormalities in the patient, ensuring the patient's life safety.

[0049] In an optional embodiment, during the process of determining whether the position of the duct pump is correct based on the pressure difference of the duct pump, the environmental monitoring module 110 is specifically used for:

[0050] Within the first monitoring period, calculate the difference between the maximum and minimum differential pressure values ​​of the duct pump to obtain the differential pressure value; obtain the minimum differential pressure value among multiple consecutive first monitoring periods; if the minimum differential pressure value is lower than the first target differential pressure threshold, determine that the environment in which the duct pump is located is abnormal.

[0051] It should be noted that the normal cardiac cycle of a person is 0.75s. The first monitoring cycle in this embodiment of the application is required to cover at least one cardiac cycle, that is, the first monitoring cycle is greater than or equal to the patient's cardiac cycle. However, it should be noted that the first monitoring cycle should not be too large, as an excessively large first monitoring cycle will have a negative impact on the accuracy of the monitoring. For example, the first monitoring cycle is 3s.

[0052] The environmental monitoring module 110 acquires the minimum pressure difference value among multiple consecutive pressure difference values ​​within the first monitoring cycle. For example, it takes the pressure difference value DP within 3 seconds to obtain the maximum pressure difference value DP within 3 seconds. max DP with minimum value min pressure difference DP max_min This is used to characterize the maximum range (range) of pressure difference variation within a cycle. Furthermore, the DP values ​​obtained from 10 consecutive first monitoring cycles (30 seconds in total) are... max_min DP to find the minimum value max_min_min That is, the minimum pressure difference value.

[0053] Furthermore, using the minimum pressure difference DP max_min_minThe system determines whether the environment in which the catheter pump operates is abnormal. If the value is below the first target differential pressure threshold, for example, 10 mmHg, then the differential pressure is considered to be stable, indicating an abnormal environment for the catheter pump. Otherwise, the environment is considered normal. If both the inlet and outlet of the catheter pump are located in the aorta, theoretically, the differential pressure change will be very small, indicating that the pump's fluid inlet has not yet entered the ventricle. Once the pump's fluid inlet enters the ventricle, the differential pressure between the pump's inlet and outlet will change significantly, thus confirming that the pump's inlet has entered the ventricle. However, abnormalities in the patient's cardiovascular system may also lead to a low pulsatility condition, resulting in a potentially small differential pressure between the pump's inlet and outlet, which can also cause no significant change in differential pressure.

[0054] In some embodiments, a small differential pressure value within a single first monitoring cycle is selected and compared with a first target differential pressure threshold for judgment. Ideally, this can also determine whether the environment in which the duct pump is located is abnormal.

[0055] Therefore, it can be seen that the environmental monitoring module 110 in this embodiment of the application uses the pressure difference DP in multiple consecutive first monitoring cycles. max_min Determining whether the position of the duct pump is correct can prevent detection deviations that may occur in a single first monitoring cycle and deviations caused by fluctuations in physiological condition, thereby improving the accuracy of the position determination module in determining the position of the duct pump.

[0056] In an optional embodiment, when the environmental monitoring module 110 detects an abnormal environment in which the duct pump is located, the position detection module 120 is specifically used to detect the position of the duct pump based on the fluid outlet pressure of the duct pump during the process of detecting the position of the duct pump:

[0057] The minimum and maximum fluid outlet pressures of the duct pump are acquired over multiple consecutive second monitoring periods. The location of the duct pump is then determined based on these maximum and minimum fluid outlet pressures.

[0058] After assessing the environment of the catheter pump through several consecutive first monitoring cycles, monitoring of the ventricular assist device can continue into the second monitoring cycle. The minimum fluid outlet pressure AP of the catheter pump during the second monitoring cycle is obtained. min and maximum fluid outlet pressure AP max .

[0059] It should be noted that the duration of the second monitoring cycle can be the same as or different from that of the first monitoring cycle, but the start time of the second monitoring cycle should be later than the start time of the most recent completed first monitoring cycle.

[0060] As mentioned earlier, the pressure in the left ventricle typically varies between 0 and 120 mmHg, while the pressure in the aorta typically varies between 80 and 120 mmHg. Analysis shows that the pressure variation range in the left ventricle is much larger than that in the aorta, and the ventricular diastolic pressure is lower than that in the aorta. Therefore, monitoring the pressure at the fluid outlet of the catheter pump can reveal the pressure variation at the fluid outlet; specifically, it allows for the acquisition of the minimum fluid outlet pressure, AP. min Maximum fluid outlet pressure AP max According to the minimum fluid outlet pressure AP min Maximum fluid outlet pressure AP max This can determine whether the fluid outlet and inlet of the catheter pump are both located in the ventricle, or whether the fluid outlet and inlet of the catheter pump are both located in the artery, or whether the patient's cardiovascular system is abnormal, resulting in a low pulsation condition.

[0061] Therefore, the position detection module 120 of the catheter pump position monitoring device 100 provided in this application embodiment can determine in detail the cause of the current abnormal environment of the catheter pump by monitoring the pressure of the fluid outlet of the catheter pump. By using fluid outlet pressure data within one or more continuous monitoring cycles and calculating the fluid outlet pressure difference, abnormal conditions in the environment of the catheter pump can be detected. By monitoring the position of the catheter pump in real time, catheter pump positioning errors and cardiovascular abnormalities in the patient can be detected and corrected in a timely manner, thereby improving the safety and reliability of the ventricular assist device and ensuring the patient's life safety.

[0062] In an optional embodiment, when the environmental monitoring module 110 detects an abnormal environment in which the duct pump is located, the position detection module 120 is specifically used to detect the position of the duct pump based on the fluid outlet pressure of the duct pump during the process of detecting the position of the duct pump.

[0063] The fluid outlet pressure difference is obtained by using the minimum and maximum fluid outlet pressures of the duct pump.

[0064] During the process of detecting the position of the duct pump based on the minimum and maximum fluid outlet pressures, the position detection module 120 uses the minimum fluid outlet pressure AP as the reference. min and maximum fluid outlet pressure AP max Calculate the fluid outlet pressure difference (AP) max -AP min The location of the duct pump is determined based on the fluid outlet pressure difference, the maximum fluid outlet pressure, and / or the minimum fluid outlet pressure.

[0065] Determine whether the fluid outlet pressure difference is lower than the low pulsating pressure difference threshold.

[0066] If the fluid outlet pressure difference is lower than the low pulsation pressure difference threshold, the duct pump is determined to be in a low pulsation environment. The low pulsation pressure difference threshold, for example, is AP. max -AP min <20 mmHg.

[0067] When the fluid outlet pressure difference is lower than the aforementioned low-pulsation pressure difference threshold, the catheter pump is considered to be in a low-pulsation environment. One possibility is that the catheter pump is correctly positioned, but because the patient's blood vessels are in a low-pulsation environment (usually the catheter pump is correctly positioned), the difference between the maximum and minimum fluid outlet pressures is extremely small, resulting in a fluid outlet pressure difference below the low-pulsation pressure difference threshold. Alternatively, another possibility is that because the patient's blood vessels are in a low-pulsation environment, it is difficult to determine whether the catheter pump has shifted, and the position of the catheter pump is unknown.

[0068] If the patient has mild aspiration or weak pulsation, the pressure difference between the inflow and outflow chambers of the pump will be small regardless of their location. Therefore, the abnormal environment monitoring module 110 will also detect any abnormalities in the environment in which the catheter pump is located.

[0069] In an optional embodiment, when the position detection module 120 determines that the duct pump is in a low-pulsation environment, the position detection module is further configured to: determine the position of the duct pump based on the suction detection result; if the suction detection result indicates that suction has occurred, then the position of the duct pump is determined to be correct; if the suction detection result indicates that no suction has occurred, then the position of the duct pump is determined to be unknown.

[0070] In other words, the suction detection results obtained from the system's suction detection module can determine whether suction is currently occurring. If suction is occurring, the position of the duct pump can generally be considered correct. If no suction is occurring, the position of the duct pump cannot be determined.

[0071] Therefore, this embodiment of the application determines whether the catheter pump is in a low-pulsation environment by detecting whether the fluid outlet pressure difference is lower than the low-pulsation pressure difference threshold, and can further combine with the aspiration detection module to determine whether the location of the catheter pump is unknown. This effectively addresses situations where the patient's blood vessels are in a low-pulsation state, such as when there is slight aspiration or weak pulsation, making it impossible to determine the location of the catheter pump using traditional pressure differences, thus avoiding incorrect location determination.

[0072] In an optional embodiment, before determining whether the fluid outlet pressure difference is lower than a low pulsating pressure difference threshold, the position detection module 120 is further configured to:

[0073] Determine whether the fluid outlet pressure difference is higher than the ventricular pressure difference threshold and whether the minimum fluid outlet pressure is lower than the ventricular hypotension threshold. If the fluid outlet pressure difference is higher than the ventricular pressure difference threshold and the minimum fluid outlet pressure is lower than the ventricular hypotension threshold, then the catheter pump is determined to be located in the ventricle.

[0074] For example, taking the ventricular assist device as an example, after determining the position of the catheter pump through multiple consecutive minimum monitoring cycles, monitoring continues for another minimum monitoring cycle: determining the fluid outlet pressure difference (AP) max -AP min Is it greater than the ventricular pressure gradient threshold, and the minimum fluid outlet pressure AP? min Whether it is below the ventricular low pressure threshold. Among them, above the ventricular pressure difference threshold, it reflects that the fluid outlet is in an environment with a large pressure difference between the highest and lowest pressures, and below the ventricular low pressure threshold, it reflects that the fluid outlet is in an environment with a low pressure. For left ventricular assist devices, the environment with a large pressure difference between the highest and lowest pressures and a low pressure is the left ventricle, that is, the entire catheter pump is moved to the left ventricle.

[0075] It should be noted that the values ​​of the ventricular pressure differential threshold and the ventricular low pressure threshold reflect the current environmental pressure difference at the fluid outlet, indicating a large differential pressure and a low low pressure, and can be flexibly selected. For example, the ventricular pressure differential threshold can be set to 50 mmHg, and the ventricular low pressure threshold to 20 mmHg. If the fluid outlet pressure differential is greater than 50 mmHg and the minimum fluid outlet pressure is less than 20 mmHg, then the fluid outlet is determined to be located in the left ventricle, meaning that both the fluid outlet and the fluid inlet are located in the left ventricle.

[0076] Therefore, the catheter pump position monitoring method provided in this application can accurately determine whether the catheter pump is located within the ventricle by judging whether the fluid outlet pressure difference is higher than the ventricular pressure difference threshold and combining this with whether the minimum fluid outlet pressure is lower than the ventricular hypotension threshold before determining whether the catheter pump is in a low-pulsation environment. The catheter pump position monitoring method provided in this application can prioritize detecting whether the catheter pump has shifted into the ventricle, as this can lead to dangerous situations such as ventricular structural damage, impaired pumping function, and arrhythmias. Therefore, timely identification of catheter pump displacement within the ventricle helps reduce patient risk, ensures timely intervention, and improves system safety and stability.

[0077] In an optional embodiment, when the environmental monitoring module 110 detects an abnormal environment in which the catheter pump is located, during the process of detecting the position of the catheter pump based on the fluid outlet pressure of the catheter pump, the position detection module is further configured to: if the fluid outlet pressure difference is not lower than the low pulse pressure difference threshold, determine whether the catheter pump is located in the artery based on the fluid outlet pressure difference, the maximum fluid outlet pressure, and / or the minimum fluid outlet pressure.

[0078] In an optional embodiment, during the process of determining whether the catheter pump is located within the artery based on the fluid outlet pressure difference, the maximum fluid outlet pressure, and / or the minimum fluid outlet pressure, the position detection module 120 is specifically used for:

[0079] Determine whether the maximum fluid outlet pressure is higher than the arterial hypertension threshold and whether the minimum fluid outlet pressure is higher than the first arterial diastolic threshold. If the maximum fluid outlet pressure is higher than the arterial hypertension threshold and the minimum fluid outlet pressure is higher than the first arterial diastolic threshold, then the catheter pump is determined to be located within the artery.

[0080] For example, in a normal patient, arterial blood pressure varies between 80 mmHg and 120 mmHg. Therefore, the arterial high pressure threshold is set to, for example, 80 mmHg, and the first arterial low pressure threshold is set to, for example, 40 mmHg. If the maximum fluid outlet pressure is higher than 80 mmHg and the minimum fluid outlet pressure is higher than 40 mmHg, the catheter pump can be determined to be located in an artery. In this case, since the fluid outlet pressure difference has been determined beforehand to be below the low pulsation pressure difference threshold (20 mmHg), it can prevent catheter pumps with fluid outlet pressure differences below the low pulsation pressure difference threshold (20 mmHg) from being misjudged as being in the aorta.

[0081] In other embodiments, during the process of determining whether the catheter pump is located within the artery based on the fluid outlet pressure difference, the maximum fluid outlet pressure, and / or the minimum fluid outlet pressure, the position detection module 120 is specifically used for:

[0082] Determine whether the fluid outlet pressure difference is within the range of arterial pressure difference and whether the minimum fluid outlet pressure is higher than the second arterial low pressure threshold; if the fluid outlet pressure difference is within the range of arterial pressure difference and the minimum fluid outlet pressure is higher than the second arterial low pressure threshold, then determine that the catheter pump is located in the artery.

[0083] For example, taking the ventricular assist device as an example, after determining the position of the catheter pump through multiple consecutive first monitoring cycles, monitoring continues for a second monitoring cycle: determining the fluid outlet pressure difference (AP) max -AP min Is it within the range of arterial pressure differential, and the minimum fluid outlet pressure AP? min Whether it is higher than the second arterial low pressure threshold. Among them, the fluid outlet pressure difference within the arterial pressure difference range reflects the environment in which the fluid outlet is in the highest and lowest pressure range, which is consistent with the high and low pressure of the artery. If it is higher than the second arterial low pressure threshold, it reflects that the fluid outlet is in an environment with relatively high low pressure. For left ventricular assist devices, it can be determined that the current environment of the catheter pump is in the aorta.

[0084] It should be noted that the arterial pressure gradient range refers to the coverage of the high and low blood pressure in most patients' arteries, for example, 20 mmHg < AP. max -AP min <45 mmHg; while the second arterial low-pressure threshold can reflect that the current low pressure environment of the catheter pump is not too low, for example, AP min A blood pressure >20 mmHg indicates that both the fluid outlet and fluid inlet are located in the aorta.

[0085] Therefore, this application embodiment provides two methods for determining whether the catheter pump has shifted into the aorta. The position detection module 120 can operate only one of them during the detection process, but combining the two methods provides higher accuracy. The first method quickly and effectively determines whether the catheter pump is located within the artery by judging whether the maximum fluid outlet pressure is higher than the arterial high pressure threshold and whether the minimum fluid outlet pressure is higher than the arterial low pressure threshold. The second method achieves both accuracy and reliability in locating the catheter pump by judging whether the fluid outlet pressure difference is within the arterial pressure difference range and combining this with whether the minimum fluid outlet pressure is higher than the second arterial low pressure threshold. The two judgment methods provided in this application embodiment combine the pressure characteristics of the artery to ensure that the catheter pump can be accurately identified when it is in the aorta, avoiding potential complications caused by erroneous displacement of the catheter pump, helping to ensure the stable operation of the catheter pump, thereby improving patient safety and the effectiveness of the device.

[0086] In an optional embodiment, while determining whether the outlet pressure difference is lower than the low pulsating pressure difference threshold, the position detection module 120 can also determine in parallel:

[0087] The fluid outlet pressure difference is checked against whether it exceeds the ventricular pressure difference threshold and whether the minimum fluid outlet pressure is below the ventricular hypotension threshold. If the fluid outlet pressure difference exceeds the ventricular pressure difference threshold and the minimum fluid outlet pressure is below the ventricular hypotension threshold, the catheter pump is determined to be located within the ventricle.

[0088] Additionally, it determines whether the fluid outlet pressure difference is within the target arterial pressure difference range and whether the maximum fluid outlet pressure is higher than the target arterial low pressure threshold; if the fluid outlet pressure difference is within the target arterial pressure difference range and the minimum fluid outlet pressure is higher than the target arterial low pressure threshold, then it is determined that the catheter pump is located in the artery.

[0089] Taking the following example, after determining the position of the catheter pump through multiple consecutive first monitoring cycles, monitoring of the ventricular assist device continues for a second monitoring cycle: The fluid outlet pressure difference (AP) is determined. max -AP min Is it within the target arterial pressure differential range, and the maximum fluid outlet pressure AP? maxWhether it exceeds the target arterial low-pressure threshold. Below the target arterial pressure difference range indicates a small pressure difference between the highest and lowest pressures at the fluid outlet, while above the target arterial low-pressure threshold indicates a higher low-pressure environment at the fluid outlet. For left ventricular assist devices, the environment with a small pressure difference between the highest and lowest pressures and a higher high pressure is the aorta. It should be noted that the target arterial low-pressure threshold should reflect a small pressure difference and a relatively high low pressure at the fluid outlet.

[0090] For example, the target arterial pressure differential range is 20 mmHg to 50 mmHg, and the target arterial low-pressure threshold is 50 mmHg. If the fluid outlet pressure differential is within the range of 20 mmHg to 50 mmHg, and the maximum fluid outlet pressure is greater than 50 mmHg, then the fluid outlet is determined to be located in the aorta.

[0091] Therefore, it can be seen that the catheter pump position monitoring device provided in this application embodiment, in addition to determining the order of whether the catheter pump is located in the ventricle, whether it is in a low-pulsation state, and then whether the catheter pump is in the aorta to determine the reason for the abnormal environment detected by the environmental monitoring module 110, can also determine in parallel whether the catheter pump is located in the ventricle, whether it is in a low-pulsation state, and whether it is located in the aorta. The two determination methods of the position detection module 120 correspond to two different determination logics, and each determination logic is independent. Therefore, the catheter pump position monitoring device provided in this application embodiment provides multiple determination logics to ensure accurate monitoring of the catheter pump's position and ensure the stable operation of the catheter pump.

[0092] In some embodiments, after determining the position of the catheter pump through multiple consecutive first monitoring cycles, the ventricular assist device can be monitored for several consecutive first monitoring cycles. For example, the second monitoring cycle consists of 10 consecutive first monitoring cycles. First, the minimum fluid outlet pressure AP of each detection cycle within the 10 consecutive first monitoring cycles is obtained. min Maximum fluid outlet pressure AP max and fluid outlet pressure difference (AP) max -AP min ), obtain 10 AP min 10 APs max and 10 (AP) max -AP min The outliers can be removed from these three sets of data first, then the mean and standard deviation can be calculated, and finally the processed data can be used to determine the specific location of the duct pump.

[0093] In some embodiments, when the number of first monitoring periods included in the second monitoring period is large, the p-value can be used for judgment (the p-value is a probability value calculated based on sample data in hypothesis testing, used to evaluate the degree of support of the sample data for the null hypothesis).

[0094] Therefore, in this embodiment, the position detection module 120 determines the specific erroneous position of the catheter pump by judging the fluid outlet pressure difference and the minimum fluid outlet pressure, combined with the preset target pressure difference threshold and low pressure threshold; so as to guide the correction of the erroneous position of the catheter pump and ensure the patient's life safety.

[0095] In this embodiment of the application, after the position detection module 120 completes the determination of whether the catheter pump is located in the ventricle, whether the catheter pump is located in the aorta, and whether the catheter pump is in a low pulsation environment, if there are other situations, the position detection module 120 determines that the position is unknown.

[0096] Please refer to Figure 2 , Figure 2 The second intention of the module of the position monitoring device for the duct pump provided in the embodiment of this application is as follows: The position monitoring device 100 for the duct pump further includes a differential pressure monitoring module 130, which is used to calculate the differential pressure of the duct pump based on the speed of the motor and the current of the motor.

[0097] The electric motor drives the catheter pump, which pumps blood from the heart and delivers it to the systemic circulation. During this process, the blood flow rate of the catheter pump can be adjusted by controlling the speed of the electric motor.

[0098] The differential pressure monitoring module 130 can calculate the differential pressure of the duct pump by the motor speed and the motor current. For example, the flow rate of the duct pump is first calculated based on the motor speed and the motor current, and then the differential pressure of the duct pump is calculated based on the motor speed and the duct pump flow rate.

[0099] In an optional embodiment, the flow rate F of the duct pump is first calculated based on the motor's rotational speed (or angular velocity w) and current I. For the motor, this is based on the motor's rotor dynamics equation:

[0100]

[0101] And the torque equation of the motor:

[0102]

[0103] The load torque T of the motor can be calculated. p :

[0104]

[0105] In Equation 1), J is the moment of inertia of the motor, and T... e T is the motor torque. p Where K is the load torque of the motor, B is the damping coefficient, and w is the angular velocity of the motor; in equation 2), K b Let be the back electromotive force constant of the motor, and I be the current.

[0106] Furthermore, since the load torque of the motor is related to the duct pump, for example:

[0107] T p =α1w 2 +a2F 2 w 2 Equation 4)

[0108] In equation 4), T p Let T be the load torque, F be the current pump flow rate, w be the motor angular velocity, and a1 and a2 be constant coefficients. a1 and a2 can be obtained by fitting multiple sets of relationships between motor speed and pump flow rate obtained through external testing. It should be noted that the expression of load torque is not limited to equation 4) above and may have multiple forms. p It can be a polynomial combination of the motor's angular velocity w and the flow rate F, which can reflect the coupling between the motor and the pump. Equation 4) above is only one possible implementation method. Other load torque and flow rate models can also be selected in the process of calculating the flow rate.

[0109] Combining equations 3) and 4) above, the relationship between the motor speed, the motor current, and the pump flow rate is as follows:

[0110]

[0111] Therefore, the pump flow rate F can be obtained based on Equation 5).

[0112] Then, calculate the pressure difference of the duct pump based on the motor speed and the flow rate of the duct pump. Considering the hydraulic characteristics of the duct pump, the following characteristic equation is obtained:

[0113] Where AP is the differential pressure of the duct pump; b0, b1 and b2 are unknown parameters. b0, b1 and b2 can be obtained by in vitro testing to obtain multiple sets of pump flow rate, motor speed and pump differential pressure data, and obtain the HQ curve (the curve represents the relationship between the pump flow rate and head H), and fit the curve.

[0114] Substituting the flow rate calculated by equation 5) into equation 6), the pressure difference AP of the duct pump can be obtained.

[0115] The position monitoring device for the duct pump provided in this application embodiment can obtain the pressure difference of the duct pump based on the motor speed and motor current, which is helpful for the environmental monitoring module 110 to determine whether the environment in which the duct pump is located is abnormal.

[0116] Please continue reading. Figure 2 In an optional embodiment, the location monitoring device further includes an alarm module 140.

[0117] The alarm module 140 is used to issue an environmental abnormality alarm and environmental abnormality information when the environmental monitoring module 110 detects an abnormal environment in which the duct pump is located.

[0118] The alarm module 140 is also used to deactivate the environmental anomaly alarm when the environmental monitoring module 120 determines that the environment in which the duct pump is located is normal.

[0119] The alarm module 140 is also used to issue a prompt message indicating that intervention is required if the alarm is not deactivated after a preset number of first monitoring cycles following the issuance of an environmental anomaly alarm.

[0120] When an abnormal environment is detected in the catheter pump, the alarm module 140 will immediately issue an environmental abnormality alarm to inform medical staff of the pump's current location status. If the location error alarm persists for multiple preset first monitoring cycles without being cleared, i.e., the alarm does not automatically clear up after multiple cycles or remains at the same location, the alarm module 140 will issue a prompt message indicating that intervention is required. Simultaneously, this also prevents the pump from still moving within a single monitoring cycle, causing the minimum pressure differential value to fail to represent the current actual location status and generate false alarms.

[0121] Therefore, this system enables timely monitoring and alerts for abnormal catheter pump positioning, ensuring patient safety. Simultaneously, issuing environmental anomaly alerts helps healthcare professionals quickly understand the nature and severity of the problem, allowing them to take appropriate measures and minimize potential risks.

[0122] Please refer to Figure 3 , Figure 3 This is a schematic diagram of a ventricular assist device provided in an embodiment of this application; a second aspect of this application also provides a ventricular assist device 200, which includes a motor 210, a catheter pump 220, a sensor 230, and the aforementioned catheter pump position monitoring device 100.

[0123] Sensor 230 is located near the fluid outlet of duct pump 220 and is used to monitor the fluid outlet pressure of duct pump 220.

[0124] The position monitoring device of the duct pump 220 is used to determine whether the environment in which the duct pump 220 is located is abnormal based on the speed of the motor 210 and the current of the motor 210.

[0125] The position monitoring device for the duct pump 220 is also used to detect the position of the duct pump 220 based on the fluid outlet pressure when the position monitoring device 100 detects an abnormal environment in which the duct pump 220 is located.

[0126] It should be noted that the position detection device of the duct pump 220 can be referred to the above text for judging the position of the duct pump 220 and identifying the erroneous position, and will not be repeated here.

[0127] pass Figure 3 As can be seen, the ventricular assist device provided in this application embodiment includes a motor 210, a catheter pump 220, a sensor 230, and a position monitoring device for the catheter pump 220. The sensor 230 is located near the fluid outlet of the catheter pump 220 to monitor the fluid outlet pressure. The position monitoring device for the catheter pump 220 determines whether the position of the catheter pump 220 is correct by monitoring the rotational speed and current of the motor 210. When an abnormal environment is detected in the catheter pump 220, the device can detect the position of the catheter pump 220 based on the fluid outlet pressure. This ventricular assist device, combined with the function of the catheter pump 220 position monitoring device, achieves accurate monitoring of the position of the catheter pump 220 and timely identification of erroneous positions, thereby improving the safety and reliability of the ventricular assist device.

[0128] Please refer to Figure 4 , Figure 4 This application provides a flowchart of a method for monitoring the position of a ducted pump according to an embodiment of the present application; the present application also provides a method for monitoring the position of a ducted pump, which can be... Figure 5 The provided electronic equipment performs this. The method for monitoring the position of the duct pump includes the following steps:

[0129] Step S100: Calculate the pressure difference of the duct pump based on the motor speed and motor current.

[0130] In step S100 above, the pressure difference of the duct pump is calculated based on the motor speed and motor current. For example, the flow rate of the duct pump is first calculated based on the motor speed and motor current, and then the pressure difference of the duct pump is calculated based on the motor speed and duct pump flow rate.

[0131] Step S200: Based on the pressure difference of the duct pump, monitor whether the environment in which the duct pump is located is abnormal.

[0132] For example, the difference between the maximum and minimum pressure difference values ​​within the first monitoring period is determined to obtain the pressure difference value; the minimum pressure difference value among multiple consecutive first monitoring periods is obtained; if the minimum pressure difference value is lower than the first target pressure difference threshold, the environment in which the duct pump is located is determined to be abnormal.

[0133] Step S300: The position detection module is used to detect the position of the duct pump based on the fluid outlet pressure when it is determined that the environment in which the duct pump is located is abnormal.

[0134] For example, the minimum and maximum fluid outlet pressures of the duct pump are acquired within multiple consecutive second monitoring cycles; the position of the duct pump is detected based on the maximum and minimum fluid outlet pressures; wherein the start time of the second monitoring cycle is later than the start time of the first monitoring cycle.

[0135] Furthermore, the fluid outlet pressure difference is obtained based on the difference between the maximum fluid outlet pressure and the minimum fluid outlet pressure.

[0136] For example, it is determined whether the fluid outlet pressure difference is higher than the ventricular pressure difference threshold and whether the minimum fluid outlet pressure is lower than the ventricular low pressure threshold; if the fluid outlet pressure difference is higher than the ventricular pressure difference threshold and the minimum fluid outlet pressure is lower than the ventricular low pressure threshold, then the catheter pump is determined to be located in the ventricle.

[0137] Furthermore, it is determined whether the fluid outlet pressure difference is lower than the low pulsating pressure difference threshold; if the fluid outlet pressure difference is lower than the low pulsating pressure difference threshold, the duct pump is determined to be in a low pulsating environment.

[0138] Further, determine whether the maximum fluid outlet pressure is higher than the arterial hypertension threshold and whether the minimum fluid outlet pressure is higher than the first arterial diastolic threshold. If the maximum fluid outlet pressure is higher than the arterial hypertension threshold and the minimum fluid outlet pressure is higher than the first arterial diastolic threshold, then the catheter pump is determined to be located within the artery. Alternatively, determine whether the fluid outlet pressure difference is within the arterial pressure difference range and whether the minimum fluid outlet pressure is higher than the second arterial diastolic threshold. If the fluid outlet pressure difference is within the arterial pressure difference range and the minimum fluid outlet pressure is higher than the second arterial diastolic threshold, then the catheter pump is determined to be located within the artery.

[0139] For example, the following judgments are performed in parallel:

[0140] Determine whether the fluid outlet pressure difference is higher than the ventricular pressure difference threshold and whether the minimum fluid outlet pressure is lower than the ventricular diastolic pressure threshold. If the fluid outlet pressure difference is higher than the ventricular pressure difference threshold and the minimum fluid outlet pressure is lower than the ventricular diastolic pressure threshold, then the catheter pump is determined to be located in the ventricle.

[0141] Determine whether the fluid outlet pressure difference is lower than the low pulsating pressure difference threshold; if the fluid outlet pressure difference is lower than the low pulsating pressure difference threshold, then the duct pump is determined to be in a low pulsating environment.

[0142] Determine whether the fluid outlet pressure difference is within the target arterial pressure difference range and whether the maximum fluid outlet pressure is higher than the target arterial low pressure threshold. If the fluid outlet pressure difference is within the target arterial pressure difference range and the minimum fluid outlet pressure is higher than the target arterial low pressure threshold, then the catheter pump is determined to be located in the artery.

[0143] If any situation other than those described above exists, it is determined that the location of the duct pump is unknown.

[0144] pass Figure 4 It is understood that this application also provides a method for monitoring the position of a catheter pump to ensure that the catheter pump of a ventricular assist device is always in the correct position. This method, by comprehensively considering the pressure differential and fluid outlet pressure of the catheter pump, can accurately identify erroneous positions of the catheter pump, thereby enabling timely intervention to ensure the normal operation of the cardiac assist device and the safety of the patient.

[0145] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. An electronic device 300 provided in this application includes: a processor 301 and a memory 302. The memory 302 stores machine-readable instructions executable by the processor 301. When the machine-readable instructions are executed by the processor 301, the method described above is performed.

[0146] Based on the same inventive concept, embodiments of this application also provide a computer-readable storage medium storing computer program instructions, which, when read and executed by a processor, perform steps in any implementation of the above-described method for monitoring the position of a duct pump.

[0147] The computer-readable storage medium can be any medium capable of storing program code, such as Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM).

[0148] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0149] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A position monitoring device for a duct pump, characterized in that, The location monitoring device includes: an environmental monitoring module and a location detection module; The environmental monitoring module is used to monitor whether the environment in which the duct pump is located is abnormal based on the pressure difference of the duct pump; wherein, the pressure difference of the duct pump represents the pressure difference between the fluid outlet and the fluid inlet of the duct pump; The position detection module is used to detect the position of the duct pump based on the fluid outlet pressure of the duct pump when the environmental monitoring module detects an abnormal environment in which the duct pump is located.

2. The position monitoring device for the duct pump according to claim 1, characterized in that, When the environmental monitoring module detects an abnormal environment for the duct pump, and during the process of detecting the position of the duct pump based on the fluid outlet pressure, the position detection module is specifically used for: The fluid outlet pressure difference is obtained based on the minimum and maximum fluid outlet pressures of the duct pump. Determine whether the fluid outlet pressure difference is lower than the low pulsating pressure difference threshold; If the fluid outlet pressure difference is lower than the low pulsation pressure difference threshold, the duct pump is determined to be in a low pulsation environment.

3. The position monitoring device for the duct pump according to claim 2, characterized in that, When the position detection module determines that the duct pump is in a low-pulsation environment, the position detection module is further configured to: The position of the duct pump is determined based on the suction test results; If the suction test result shows that suction has occurred, then the position of the duct pump is determined to be correct; If the suction detection result is that no suction occurred, then the position of the duct pump is determined to be unknown.

4. The position monitoring device for the duct pump according to claim 2, characterized in that, Before determining whether the fluid outlet pressure difference is lower than the low pulsating pressure difference threshold, the position detection module is further configured to: Determine whether the fluid outlet pressure difference is higher than the ventricular pressure difference threshold and whether the minimum fluid outlet pressure is lower than the ventricular hypotension threshold; If the fluid outlet pressure difference is higher than the ventricular pressure difference threshold and the minimum fluid outlet pressure is lower than the ventricular low pressure threshold, then the catheter pump is determined to be located in the ventricle.

5. The position monitoring device for the duct pump according to claim 2, characterized in that, When the environmental monitoring module detects an abnormal environment for the duct pump, during the process of detecting the position of the duct pump based on the fluid outlet pressure, the position detection module is further used for: If the fluid outlet pressure difference is not lower than the low pulse pressure difference threshold, then the catheter pump is determined to be located in the artery based on the fluid outlet pressure difference, the maximum fluid outlet pressure, and / or the minimum fluid outlet pressure.

6. The position monitoring device for the duct pump according to claim 5, characterized in that, In the process of determining whether the catheter pump is located within the artery based on the fluid outlet pressure difference, the maximum fluid outlet pressure, and / or the minimum fluid outlet pressure, the position detection module is specifically used for: Determine whether the maximum fluid outlet pressure is higher than the arterial hypertension threshold and whether the minimum fluid outlet pressure is higher than the first arterial diastolic threshold; If the maximum fluid outlet pressure is higher than the arterial hypertension threshold and the minimum fluid outlet pressure is higher than the first arterial hypotension threshold, then the catheter pump is determined to be located in the artery.

7. The position monitoring device for the duct pump according to claim 5, characterized in that, In the process of determining whether the catheter pump is located within the artery based on the fluid outlet pressure difference, the maximum fluid outlet pressure, and / or the minimum fluid outlet pressure, the position detection module is specifically used for: Determine whether the fluid outlet pressure difference is within the range of arterial pressure difference, and whether the minimum fluid outlet pressure is higher than the second arterial low pressure threshold; If the fluid outlet pressure difference is within the range of arterial pressure difference, and the minimum fluid outlet pressure is higher than the second arterial low pressure threshold, then the catheter pump is determined to be located inside the artery.

8. A method for monitoring the position of a duct pump, characterized in that, The location monitoring method includes: The differential pressure of the duct pump is determined based on the motor's rotational speed and current; wherein the motor drives the duct pump. Based on the pressure difference of the duct pump, determine whether the environment in which the duct pump is located is abnormal; If the environment in which the duct pump is located is determined to be abnormal, the position of the duct pump is detected based on the fluid outlet pressure of the duct pump.

9. A ventricular assist device, characterized in that, The ventricular assist device includes a motor, a catheter pump, sensors, and a catheter pump position monitoring device; The sensor is positioned near the fluid outlet of the duct pump and is used to monitor the fluid outlet pressure of the duct pump. The position monitoring device of the duct pump is used to determine whether the environment in which the duct pump is located is abnormal based on the speed of the motor and the current of the motor. The position monitoring device for the duct pump is also used to detect the position of the duct pump based on the fluid outlet pressure when the position monitoring device detects an abnormal environment for the duct pump.

10. An electronic device, characterized in that, The electronic device includes a memory and a processor, the memory storing program instructions, and the processor executing the program instructions to perform the steps of the method according to any one of claims 8.

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