A flushing system based on a ventricular catheter pump

Abstract

This application provides a flushing system based on a ventricular catheter pump, relating to the field of medical device technology. It includes: a flushing pressure filtering module for acquiring an initial flushing pressure signal collected by a flushing pressure acquisition module, performing multi-stage filtering on the initial flushing pressure signal, and using the processed initial flushing pressure signal as a target flushing pressure signal; a flushing control calculation module for acquiring the target flushing pressure signal, the current flushing flow rate signal of the flushing device, and the current motor current signal of the flushing drive motor, and using a preset closed-loop feedback mode to calculate and process the target flushing pressure signal, the flushing flow rate signal, and the motor current signal to determine the motor control signal of the flushing drive motor; and a motor drive module for driving the flushing drive motor according to the motor control signal. Applying the solution provided in this embodiment enables precise and stable flushing control.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a flushing system based on a ventricular catheter pump. Background Technology

[0002] A ventricular catheter pump is a device that provides support or assistance to patients with heart-related conditions, such as heart failure, by helping the heart pump blood to other parts of the body.

[0003] The ventricular catheter pump is also connected to a flushing system. This system injects flushing fluid around the drive components of the pump, using the flushing pressure to counteract the pressure of blood entering the drive components. This prevents blood from entering the drive components and causing subsequent medical accidents such as thrombosis and pump malfunction. Currently, achieving precise and stable control of the flushing system is a pressing issue that needs to be addressed. Summary of the Invention

[0004] The purpose of this application is to provide a flushing system based on a ventricular catheter pump to achieve precise and stable flushing control. The specific technical solution is as follows:

[0005] In a first aspect, embodiments of this application provide a flushing system based on a ventricular catheter pump. The flushing system includes a flushing control device and a flushing device, wherein: the flushing device integrates a flushing pressure acquisition module and a flushing drive motor; the flushing control device integrates a flushing pressure filtering module, a flushing control calculation module, and a motor drive module; wherein:

[0006] The input terminal of the flushing pressure filtering module is connected to the output terminal of the flushing pressure acquisition module, and the output terminal is connected to the input terminal of the flushing control calculation module; the input terminal of the flushing control calculation module is connected to the output terminal of the flushing pressure filtering module, and the output terminal is connected to the input terminal of the motor drive module; the input terminal of the motor drive module is connected to the output terminal of the flushing control calculation module, and the output terminal is connected to the input terminal of the flushing drive motor.

[0007] The flushing pressure filtering module is used to acquire the initial flushing pressure signal acquired by the flushing pressure acquisition module, perform multi-stage filtering on the initial flushing pressure signal, and use the processed initial flushing pressure signal as the target flushing pressure signal.

[0008] The flushing control calculation module is used to acquire the target flushing pressure signal, the current flushing flow signal of the flushing device, and the current motor current signal of the flushing drive motor. It uses a preset closed-loop feedback mode to process the target flushing pressure signal, the flushing flow signal, and the motor current signal to determine the motor control signal of the flushing drive motor.

[0009] The motor drive module is used to drive the flushing drive motor to operate according to the motor control signal.

[0010] In one embodiment of this application, the flushing pressure filtering module integrates a first filtering circuit, an amplification circuit, a second filtering circuit, a third filtering circuit, and a fourth filtering circuit, wherein:

[0011] The input terminal of the first filter circuit is connected to the flushing pressure acquisition module, and the output terminal is connected to the amplification circuit; the input terminal of the amplification circuit is connected to the first filter circuit, and the output terminal is connected to the second filter circuit; the input terminal of the second filter circuit is connected to the amplification circuit, and the output terminal is connected to the third filter circuit; the input terminal of the third filter circuit is connected to the second filter circuit, and the output terminal is connected to the fourth filter circuit; the input terminal of the fourth filter circuit is connected to the third filter circuit, and the output terminal is connected to the flushing control calculation module.

[0012] The first filtering circuit is used to filter out common-mode interference and differential-mode interference in the initial flushing pressure signal, and use the filtered signal as the first flushing pressure signal.

[0013] The amplification circuit is used to amplify the first flushing pressure and use the amplified signal as the second flushing pressure signal.

[0014] The second filtering circuit is used to perform low-pass filtering on the second flushing pressure signal and use the filtered signal as the third flushing pressure signal.

[0015] The third filtering circuit is used to match the input signal impedance and the output signal impedance, and adopts a second-order active low-pass filtering method to filter the third flushing pressure signal, and uses the filtered signal as the fourth flushing pressure signal.

[0016] The fourth filtering circuit is used to perform low-pass filtering on the fourth flushing pressure signal and use the filtered signal as the target flushing pressure signal.

[0017] In one embodiment of this application, the first filter circuit includes: a first inductor L1, a second inductor L2, a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, and a third capacitor C3, wherein:

[0018] One end of the first inductor L1 is connected to the output terminal of the flushing pressure acquisition module, and the other end is connected to one end of the first resistor R1;

[0019] One end of the first resistor R1 is connected to one end of the first inductor L1, and the other end is connected to one end of the first capacitor C1 and one end of the third capacitor C3, respectively.

[0020] One end of the first capacitor C1 is connected to the other end of the first resistor R1, and the other end is grounded and also connected to one end of the second capacitor C2;

[0021] One end of the second inductor L2 is connected to the output terminal of the pressure acquisition module, and the other end is connected to one end of the second resistor R2;

[0022] One end of the second resistor R2 is connected to one end of the second inductor L2, and the other end is connected to one end of the second capacitor C2 and one end of the third capacitor C3, respectively;

[0023] One end of the second capacitor C2 is connected to the other end of the second resistor R2, and the other end is grounded and also connected to one end of the second capacitor C2;

[0024] One end of the third capacitor C3 is connected to one end of the first resistor R1 and the first input terminal of the amplifier circuit, and the other end is connected to one end of the second resistor R2 and the second input terminal of the amplifier circuit.

[0025] In one embodiment of this application, the above-mentioned amplification circuit includes an amplifier U1 and a third resistor R3, wherein:

[0026] The first input terminal of the amplifier U1 is connected to the first output terminal of the first filter circuit, and the second input terminal is connected to the second output terminal of the first filter circuit.

[0027] The amplifier U1 is also connected in parallel with the third resistor R3;

[0028] The output terminal of the amplifier U1 is connected to the input terminal of the second filter circuit.

[0029] In one embodiment of this application, the second filter circuit includes a fourth resistor R4 and a fourth capacitor C4, wherein:

[0030] One end of the fourth resistor R4 is connected to the output terminal of the amplifier circuit, and the other end is connected to one end of the fourth capacitor C4 and the input terminal of the third filter circuit.

[0031] One end of the fourth capacitor C4 is connected to one end of the fourth resistor R4, and the other end is grounded.

[0032] In one embodiment of this application, the third filter circuit includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a fifth capacitor C5, a sixth capacitor C6, and a voltage follower U2.

[0033] One end of the fifth resistor R5 is connected to the output terminal of the second filter circuit, and the other end is connected to one end of the fifth capacitor C5 and one end of the sixth resistor R6, respectively.

[0034] One end of the sixth resistor R6 is connected to one end of the fifth resistor R5, and the other end is connected to the input terminal of the voltage follower U2 and one end of the sixth capacitor C6, respectively.

[0035] One end of the fifth capacitor C5 is connected to one end of the fifth resistor R5, and the other end is connected to the output terminal of the fourth filter circuit.

[0036] One end of the sixth capacitor C6 is connected to one end of the sixth resistor R6 and the input terminal of the voltage follower U2, and the other end is connected to one end of the seventh resistor R7.

[0037] One end of the seventh resistor R7 is connected to one end of the sixth capacitor C6, and the other end is connected to the second input terminal of the voltage follower U2 and the input terminal of the fourth filter circuit, respectively.

[0038] The first input terminal of the voltage follower U2 is connected to the sixth resistor R6 and the sixth capacitor C6, respectively, and the second input terminal is connected to one end of the seventh resistor R7 and the input terminal of the fourth filter circuit, respectively.

[0039] The output of the voltage follower U2 is connected to the input of the fourth filter circuit.

[0040] In one embodiment of this application, the fourth filter circuit includes an eighth resistor R8 and a seventh capacitor C7; wherein:

[0041] One end of the eighth resistor R8 is connected to the output terminal of the third filter circuit, and the other end is connected to one end of the seventh capacitor C7 and the input terminal of the flushing control operation module.

[0042] One end of the seventh capacitor C7 is connected to the input terminal of the flushing control calculation module, and the other end is grounded.

[0043] As can be seen from the above, the system provided by the embodiments of this application includes a flushing control device and a flushing device. The flushing control device integrates a flushing pressure filtering module, a flushing control calculation module, and a motor drive module. The flushing pressure filtering module accurately filters out noise signals in the initial flushing pressure signal through multi-stage filtering. The flushing control calculation module uses the flushing pressure signal, flushing flow signal, and motor current signal as feedback signals through a closed-loop feedback mode to achieve precise and stable flushing control.

[0044] Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0046] Figure 1 A schematic diagram of a ventricular catheter pump system provided in this application embodiment;

[0047] Figure 2 A schematic diagram of a flushing system based on a ventricular catheter pump is provided for an embodiment of this application;

[0048] Figure 3 This is a schematic diagram of the structure of a flushing pressure filtering module provided in an embodiment of this application;

[0049] Figure 4 A schematic diagram of the circuit structure of the first filter circuit provided in an embodiment of this application;

[0050] Figure 5 A schematic diagram of the circuit structure of the amplifier circuit provided in the embodiments of this application;

[0051] Figure 6 A schematic diagram of the circuit structure of the second filter circuit provided in the embodiments of this application;

[0052] Figure 7 A schematic diagram of the circuit structure of the third filter circuit provided in the embodiments of this application;

[0053] Figure 8 This is a schematic diagram of the circuit structure of the fourth filter circuit provided in an embodiment of this application. Detailed Implementation

[0054] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art based on this application are within the scope of protection of this application.

[0055] Before introducing the embodiments of this application, firstly, in conjunction with Figure 1 The application scenarios of this application are explained.

[0056] Figure 1 The system includes a ventricular catheter pump 101 and a flushing system 102. The flushing system 102 includes a flushing control device 1021 and a flushing device 1022. The flushing control device 1021 is connected to the flushing device 1022, and the flushing device 1022 is connected to the ventricular catheter pump 101 through a flushing pipeline.

[0057] The ventricular catheter pump 101 is a device used to assist the patient's heart in pumping blood. The ventricular catheter pump 101 rotates at high speed to assist the pumping of blood from the ventricle into the artery. The ventricular catheter pump 101 can be a left ventricular catheter pump or a right ventricular catheter pump.

[0058] When the ventricular catheter pump 101 is running in the patient's body, blood may enter the drive components of the ventricular catheter pump 101, such as the motor, which may lead to a series of medical safety accidents such as thrombosis and pump failure. To avoid such accidents, a flushing system 102 is used to generate a flushing fluid outside the drive components in the opposite direction to the blood flow, and the flushing pressure of the flushing fluid is greater than the blood pressure, thereby preventing blood from flowing into the drive components.

[0059] The flushing device integrates a flushing pressure acquisition module and a flushing drive motor. The flushing pressure acquisition module is used to acquire the flushing pressure signal of the flushing fluid pumped out by the flushing device. The flushing drive motor is one of the core components of the flushing device, used to drive the flushing pump in the flushing device to operate. For example, starting and stopping are both achieved by the flushing drive motor.

[0060] The rinsing control device 1021 is used to control the operation of the rinsing device 1022. The rinsing control device integrates a rinsing control circuit, which mainly controls the rinsing drive motor in the rinsing device to realize the operation of the rinsing device.

[0061] The embodiments of this application are described in detail below.

[0062] See Figure 2 , Figure 2This application provides a schematic diagram of a flushing system based on a ventricular catheter pump. The flushing system includes a flushing control device 201 and a flushing device 202. The flushing device integrates a flushing pressure acquisition module 2021 and a flushing drive motor 2022. The flushing control device 201 integrates a flushing pressure filtering module 2011, a flushing control calculation module 2012, and a motor drive module 2013.

[0063] The input terminal of the flushing pressure filtering module 2011 is connected to the output terminal of the flushing pressure acquisition module 2021, and the output terminal is connected to the input terminal of the flushing control calculation module 2012; the input terminal of the flushing control calculation module 2012 is connected to the output terminal of the flushing pressure filtering module 2011, and the output terminal is connected to the input terminal of the motor drive module 2013; the input terminal of the motor drive module 2013 is connected to the output terminal of the flushing control calculation module 2012, and the output terminal is connected to the input terminal of the flushing drive motor 2022.

[0064] The flushing pressure filtering module 2011 is used to acquire the initial flushing pressure signal collected by the flushing pressure acquisition module, perform multi-stage filtering on the initial flushing pressure signal, and use the processed initial flushing pressure as the target flushing pressure signal.

[0065] The flushing pressure acquisition module can transmit the acquired initial flushing pressure signal to the aforementioned flushing pressure filtering module 2011.

[0066] During the process of the flushing device injecting flushing fluid into the ventricular catheter pump, the pressure of the flushing fluid is subject to various interferences, such as the complex blood environment inside the blood vessels and the operating environment of the ventricular catheter pump. Therefore, in this embodiment, the initial flushing pressure signal is subjected to multi-level filtering, which can effectively filter out the noise caused by the complex environment, achieve accurate noise reduction of the initial flushing pressure signal, and make the filtered target flushing pressure signal closer to the accurate flushing pressure signal.

[0067] The flushing pressure filtering module can employ a multi-stage filtering circuit structure to achieve multi-stage filtering. For details on the specific multi-stage filtering circuit structure, please refer to the subsequent sections. Figure 3 The corresponding implementation examples will not be described in detail here.

[0068] The flushing control calculation module 2012 is used to acquire the target flushing pressure signal, the current flushing flow signal of the flushing device, and the current motor current signal of the flushing drive motor. It uses a preset closed-loop feedback mode to process the target flushing pressure signal, the flushing flow signal, and the motor current signal to determine the motor control signal of the flushing drive motor.

[0069] The flushing flow rate signal represents the flow rate of the flushing fluid injected into the ventricular catheter pump by the current flushing device. Both the flushing flow rate signal and the motor current signal can be acquired through corresponding sensors. In this embodiment, the flushing flow rate signal and motor current signal are not filtered according to the multi-stage filtering method of the target flushing pressure signal. This is because, compared to the flushing pressure, the flushing flow rate and motor current are relatively stable, and the acquisition results are more accurate. Therefore, this method can effectively utilize resources, avoid wasting ineffective resources, reduce costs, and improve efficiency.

[0070] The flushing flow signal, motor current signal, and flushing pressure signal are all acquired in real time. These three signals serve as feedback signals in the aforementioned closed-loop feedback mode. Through the closed-loop circuit in the closed-loop feedback mode, the flushing control calculation module processes the feedback signals. For example, it can determine the difference between the feedback signal and the desired feedback signal, and determine the control signal corresponding to the difference, which serves as the motor control signal for the flushing drive motor.

[0071] The motor drive module 2013 is used to drive the flushing drive motor according to the motor control signal.

[0072] As can be seen from the above, the system provided in this embodiment includes a flushing control device and a flushing device. The flushing control device integrates a flushing pressure filtering module, a flushing control calculation module, and a motor drive module. The flushing pressure filtering module accurately filters out noise signals in the initial flushing pressure signal through multi-stage filtering. The flushing control calculation module uses the flushing pressure signal, flushing flow signal, and motor current signal as feedback signals through a closed-loop feedback mode to achieve precise and stable flushing control.

[0073] The foregoing Figure 2 In a corresponding embodiment, the flushing pressure filtering module may include a multi-stage filtering structure; based on this, see [reference needed]. Figure 3 , Figure 3 This is a schematic diagram of a flushing pressure filtering module provided in an embodiment of this application. The flushing pressure filtering module integrates a first filtering circuit 301, an amplifier circuit 302, a second filtering circuit 303, a third filtering circuit 304, and a fourth filtering circuit 305; wherein:

[0074] The input terminal of the first filter circuit 301 is connected to the flushing pressure acquisition module, and the output terminal is connected to the amplifier circuit 302; the input terminal of the amplifier circuit 302 is connected to the first filter circuit 301, and the output terminal is connected to the second filter circuit 303; the input terminal of the second filter circuit 303 is connected to the amplifier circuit 302, and the output terminal is connected to the third filter circuit 304; the input terminal of the third filter circuit 304 is connected to the second filter circuit 303, and the output terminal is connected to the fourth filter circuit 305; the input terminal of the fourth filter circuit 305 is connected to the third filter circuit 304, and the output terminal is connected to the flushing control calculation module.

[0075] The first filter circuit 301 is used to filter out common-mode interference and differential-mode interference in the initial flushing pressure signal, and use the filtered signal as the first flushing pressure signal.

[0076] The amplifier circuit 302 is used to amplify the first flushing pressure and use the amplified signal as the second flushing pressure signal.

[0077] The second filter circuit 303 is used to perform low-pass filtering on the second flushing pressure signal and use the filtered signal as the third flushing pressure signal.

[0078] The third filter circuit 304 is used to match the input signal impedance and the output signal impedance, and adopts a second-order active low-pass filter to filter the third flushing pressure signal, and uses the filtered signal as the fourth flushing pressure signal.

[0079] The fourth filter circuit 305 is used to perform low-pass filtering on the fourth flushing pressure signal and use the filtered signal as the target flushing pressure signal.

[0080] In this embodiment, a multi-stage filtering circuit structure is adopted to improve the noise reduction effect of the flushing pressure signal. Specifically, the first filtering circuit filters out common-mode and differential-mode interference in the flushing pressure signal, better ensuring that noise in the flushing pressure signal is not amplified after entering the amplification circuit; the second and fourth filtering circuits ensure the quality of the output signal through low-pass filtering; the third filtering circuit achieves buffer isolation by matching the impedances before and after in the second-order active low-pass filter, avoiding mutual interference between the preceding and following stages, improving the load-carrying capacity, and ensuring the stability and reliability of the filtering circuit.

[0081] Furthermore, with the multi-stage filtering circuit, only one-stage amplification circuit is used, making the circuit more streamlined, faster in response, and less noise introduced, thus providing higher reliability for subsequent signal processing.

[0082] The foregoing Figure 3 The corresponding embodiments include multiple circuits, which are described below.

[0083] See Figure 4 , Figure 4 The diagram shows the circuit structure of the first filter circuit, which includes: a first inductor L1, a second inductor L2, a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, and a third capacitor C3, wherein:

[0084] One end of the first inductor L1 is connected to the output terminal of the flushing pressure acquisition module, and the other end is connected to the first resistor R1;

[0085] One end of the first resistor R1 is connected to one end of the first inductor L1, and the other end is connected to one end of the first capacitor C1 and one end of the third capacitor C3, respectively.

[0086] One end of the first capacitor C1 is connected to the other end of the first resistor R1, and the other end is grounded and also connected to one end of the second capacitor C2;

[0087] One end of the second inductor L2 is connected to the output terminal of the pressure acquisition module, and the other end is connected to one end of the second resistor R2;

[0088] One end of the second resistor R2 is connected to one end of the second inductor L2, and the other end is connected to one end of the second capacitor C2 and one end of the third capacitor C3, respectively.

[0089] One end of the second capacitor C2 is connected to the other end of the second resistor R2, and the other end is grounded and also connected to one end of the second capacitor C2;

[0090] One end of the third capacitor C3 is connected to one end of the first resistor R1 and the first input terminal of the amplifier circuit, and the other end is connected to one end of the second resistor R2 and the second input terminal of the amplifier circuit.

[0091] In this embodiment, the differential signal output by the flushing pressure acquisition module is connected to the first filter circuit through the first inductor L1 and the second inductor L2. The first inductor L1, the second inductor L2, and the third capacitor C4 perform differential-mode filtering on the differential signal, while the first resistor R1, the first capacitor C1, the second resistor R2, and the second capacitor C2 perform common-mode filtering on the differential signal.

[0092] In one embodiment of this application, the value of the first inductor L1 is equal to the value of the second inductor L2, the value of the first resistor R1 is equal to the value of the second resistor R2, and the value of the first capacitor C1 is equal to the value of the second capacitor C2.

[0093] See Figure 5 , Figure 5 This is a schematic diagram of the amplifier circuit, which includes: amplifier U1 and a third resistor R3, wherein:

[0094] The first input terminal of amplifier U1 is connected to the first output terminal of the first filter circuit, and the second input terminal is connected to the second output terminal of the first filter circuit.

[0095] Amplifier U1 is also connected in parallel with the third resistor R3;

[0096] The output of amplifier U1 is connected to the input of the second filter circuit.

[0097] In one embodiment of this application, amplifier U1 can be a low-power instrumentation amplifier, and the third resistor R3 is a gain adjustment resistor, R3=49.4KΩ / (G-1), where G is a preset gain factor.

[0098] See Figure 6 , Figure 6 This is a schematic diagram of the circuit structure of the second filter circuit. The second filter circuit includes a fourth resistor R4 and a fourth capacitor C4, wherein:

[0099] One end of the fourth resistor R4 is connected to the output terminal of the amplifier circuit, and the other end is connected to one end of the fourth capacitor C4 and the input terminal of the third filter circuit.

[0100] One end of the fourth capacitor C4 is connected to one end of the fourth resistor R4, and the other end is grounded.

[0101] See Figure 7 , Figure 7 This is a schematic diagram of the circuit structure of the third filter circuit. The third filter circuit includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a fifth capacitor C5, a sixth capacitor C6, and a voltage follower U2, wherein:

[0102] One end of the fifth resistor R5 is connected to the output of the second filter circuit, and the other end is connected to one end of the fifth capacitor C5 and one end of the sixth resistor R6.

[0103] One end of the sixth resistor R6 is connected to one end of the fifth resistor R5, and the other end is connected to the input terminal of the voltage follower U2 and one end of the sixth capacitor C6, respectively.

[0104] One end of the fifth capacitor C5 is connected to one end of the fifth resistor R5, and the other end is connected to the output of the fourth filter circuit.

[0105] One end of the sixth capacitor C6 is connected to one end of the sixth resistor R6 and the input terminal of the voltage follower U2, and the other end is connected to one end of the seventh resistor R7.

[0106] One end of the seventh resistor R7 is connected to one end of the sixth capacitor C6, and the other end is connected to the second input terminal of the voltage follower U2 and the input terminal of the fourth filter circuit, respectively.

[0107] The first input terminal of the voltage follower U2 is connected to one end of the sixth resistor R6 and one end of the sixth capacitor C6, and the second input terminal is connected to one end of the seventh resistor R7 and the input terminal of the fourth filter circuit.

[0108] The output of voltage follower U2 is connected to the input of the fourth filter circuit.

[0109] See Figure 8 , Figure 8 This is a schematic diagram of the circuit structure of the fourth filter circuit, which includes an eighth resistor R8 and a seventh capacitor C7; wherein:

[0110] One end of the eighth resistor R8 is connected to the output of the third filter circuit, and the other end is connected to one end of the seventh capacitor C7 and the input of the flushing control operation module.

[0111] One end of the seventh capacitor C7 is connected to the input terminal of the flushing control operation module, and the other end is grounded.

[0112] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply 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 limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0113] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0114] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A flush system based on a ventricular catheter pump, characterized in that, The flushing system comprises a flushing control device and a flushing device, wherein: a flushing pressure acquisition module and a flushing drive motor are integrated in the flushing device; a flushing pressure filtering module, a flushing control operation module and a motor drive module are integrated in the flushing control device; wherein: an input end of the flushing pressure filtering module is connected with an output end of the flushing pressure acquisition module, and an output end thereof is connected with an input end of the flushing control operation module; an input end of the flushing control operation module is connected with an output end of the flushing pressure filtering module, and an output end thereof is connected with an input end of the motor drive module; an input end of the motor drive module is connected with an output end of the flushing control operation module, and an output end thereof is connected with an input end of the flushing drive motor; the flushing pressure filtering module is used for acquiring an initial flushing pressure signal collected by the flushing pressure acquisition module, performing multi-stage filtering processing on the initial flushing pressure signal, and taking the processed initial flushing pressure signal as a target flushing pressure signal; the flushing control operation module is used for acquiring the target flushing pressure signal, a current flushing flow signal of the flushing device and a current motor current signal of the flushing drive motor, adopting a preset closed-loop feedback mode, performing operation processing on the target flushing pressure signal, the flushing flow signal and the motor current signal, determining a motor control signal of the flushing drive motor, taking the target flushing pressure signal, the motor current signal and the flushing flow signal as feedback signals of the closed-loop feedback mode, calculating a difference value between the feedback signals and expected feedback signals, and determining a control signal corresponding to the difference value as the motor control signal of the flushing drive motor; the motor drive module is used for driving the flushing drive motor to operate according to the motor control signal; the flushing pressure filtering module integrates a first filtering circuit, an amplification circuit, a second filtering circuit, a third filtering circuit and a fourth filtering circuit, wherein: the first filtering circuit is used for filtering common-mode interference and differential-mode interference in the initial flushing pressure signal, and taking the filtered signal as a first flushing pressure signal; the amplification circuit is used for amplifying the first flushing pressure signal, and taking the amplified signal as a second flushing pressure signal; the second filtering circuit is used for performing low-pass filtering on the second flushing pressure signal, and taking the filtered signal as a third flushing pressure signal; the third filtering circuit is used for matching input signal impedance and output signal impedance, and performing filtering on the third flushing pressure signal in a second-order active low-pass filtering mode, and taking the filtered signal as a fourth flushing pressure signal; the fourth filtering circuit is used for performing low-pass filtering on the fourth flushing pressure signal, and taking the filtered signal as the target flushing pressure signal.

2. The system of claim 1, wherein, The input end of the first filter circuit is connected with the flushing pressure acquisition module, and the output end is connected with the amplification circuit; the input end of the amplification circuit is connected with the first filter circuit, and the output end is connected with the second filter circuit; the input end of the second filter circuit is connected with the amplification circuit, and the output end is connected with the third filter circuit; the input end of the third filter circuit is connected with the second filter circuit, and the output end is connected with the fourth filter circuit; the input end of the fourth filter circuit is connected with the third filter circuit, and the output end is connected with the flushing control operation module.

3. The system of claim 2, wherein, The first filter circuit comprises a first inductor, a second inductor, a first resistor, a second resistor, a first capacitor, a second capacitor and a third capacitor. One end of the first inductor is connected with the output end of the flushing pressure acquisition module, and the other end is connected with one end of the first resistor. One end of the first resistor is connected with one end of the first inductor, and the other end is connected with one end of the first capacitor and one end of the third capacitor respectively. One end of the first capacitor is connected with the other end of the first resistor, and the other end is grounded and connected with one end of the second capacitor. One end of the second inductor is connected with the output end of the pressure acquisition module, and the other end is connected with one end of the second resistor. One end of the second resistor is connected with one end of the second inductor, and the other end is connected with one end of the second capacitor and one end of the third capacitor respectively. One end of the second capacitor is connected with the other end of the second resistor, and the other end is grounded and connected with one end of the second capacitor. One end of the third capacitor is connected with one end of the first resistor and a first input end of the amplification circuit respectively, and the other end is connected with one end of the second resistor and a second input end of the amplification circuit respectively.

4. The system of claim 3, wherein, The amplification circuit comprises an amplifier and a third resistor. A first input end of the amplifier is connected with a first output end of the first filter circuit, and a second input end is connected with a second output end of the first filter circuit. The amplifier is also connected with the third resistor in parallel. An output end of the amplifier is connected with an input end of the second filter circuit.

5. The system of claim 4, wherein, The second filter circuit comprises a fourth resistor and a fourth capacitor. One end of the fourth resistor is connected with an output end of the amplification circuit, and the other end is connected with one end of the fourth capacitor and an input end of the third filter circuit respectively. One end of the fourth capacitor is connected with one end of the fourth resistor, and the other end is grounded.

6. The system of claim 5, wherein, The third filter circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, a fifth capacitor, a sixth capacitor and a voltage follower. One end of the fifth resistor is connected with an output end of the second filter circuit, and the other end is connected with one end of the fifth capacitor and one end of the sixth resistor respectively. One end of the sixth resistor is connected with one end of the fifth resistor, and the other end is connected with an input end of the voltage follower and one end of the sixth capacitor respectively. One end of the fifth capacitor is connected with one end of the fifth resistor, and the other end is connected with an output end of the fourth filter circuit. One end of the sixth capacitor is connected with one end of the sixth resistor and the input end of the voltage follower, and the other end is connected with one end of the seventh resistor; One end of the seventh resistor is connected with one end of the sixth capacitor, and the other end is connected with the second input end of the voltage follower and the input end of the fourth filter circuit respectively; The first input end of the voltage follower is connected with the sixth resistor and the sixth capacitor respectively, and the second input end is connected with one end of the seventh resistor and the input end of the fourth filter circuit respectively; The output end of the voltage follower is connected with the input end of the fourth filter circuit.

7. The system of claim 6, wherein, The fourth filter circuit comprises an eighth resistor and a seventh capacitor; wherein: One end of the eighth resistor is connected with the output end of the third filter circuit, and the other end is connected with one end of the seventh capacitor and the input end of the flush control operation module respectively; One end of the seventh capacitor is connected with the input end of the flush control operation module, and the other end is grounded.

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