Control circuit, device and control method of ventricular assist device

Abstract

The invention discloses a control circuit, device and control method of a ventricular assist device, a microcontroller can control a blood pump to stop and protect the blood pump from being damaged due to overcurrent when a voltage signal is greater than a first voltage threshold, and can also control the blood pump to stop and protect the blood pump from being damaged due to overcurrent when the voltage signal is less than a second voltage threshold. The human body is protected from being influenced by blood pump underflow, and the human body safety is protected; the isolation power supply module can stop outputting the current to the driving circuit when the output current of the isolation power supply module is larger than the preset current, so that the blood pump is protected from being damaged due to overcurrent. Therefore, in the use process of the blood pump, overcurrent and undercurrent protection can be carried out on the blood pump, and the safety of the blood pump and the safety of a human body are protected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a control circuit, device and method of a ventricular assist device. BACKGROUND

[0002] In the prior art, an interventional ventricular assist device includes a blood pump, the blood pump includes a motor, the motor is used to drive the blood pump to run, and the running state of the blood pump also acts on the motor. Generally, the rotating speed of the blood pump is constant, but the physiological state of a person dynamically changes. The blood pump running at a fixed rotating speed cannot adapt to the physiological changes of the person, and thrombosis, suction and other situations are prone to occur, which causes the motor to overcurrent and harms the human body; when the motor is under load and undercurrent, the blood pump needs to be replaced, which also harms the human body.

[0003] Therefore, it is necessary to protect the blood pump and the human body from overcurrent and undercurrent of the blood pump during use of the interventional blood pump. SUMMARY

[0004] Therefore, the present application provides a control circuit, device and method of a ventricular assist device, which can protect the blood pump and the human body from overcurrent and undercurrent of the blood pump during use of the interventional blood pump.

[0005] To solve the above problems, the technical scheme provided by the present application is as follows:

[0006] The present application provides a control circuit of a ventricular assist device, the ventricular assist device includes a blood pump, and the control circuit includes an isolation power supply module, a sampling resistor, an amplification circuit, a filtering circuit, a driving circuit and a microcontroller. The isolation power supply module is used to supply power to the driving circuit, and the driving circuit is used to drive the blood pump. The isolation power supply module stops outputting current to the driving circuit when the output current is greater than a preset current, and resumes outputting current when the output current is less than or equal to the preset current. The sampling resistor is used to collect the output current of the isolation power supply module and convert it into a sampling voltage. The amplification circuit is used to amplify the sampling voltage and input it into the filtering circuit. The filtering circuit is used to filter out the sharp peak signal in the amplified sampling voltage. The analog-to-digital conversion interface of the microcontroller is used to collect the sampling voltage signal of the filtering circuit and convert it into a digital voltage signal. The microcontroller is used to control the blood pump to stop when the voltage signal is greater than a first voltage threshold. The microcontroller is also used to control the blood pump to stop when the voltage signal is less than a second voltage threshold. The first voltage threshold is greater than the second voltage threshold.

[0007] In a possible implementation, the microcontroller detects the voltage signal according to the sampling period, and controls the blood pump to stop when the number of times that the voltage signal is greater than the first voltage threshold is greater than or equal to a first number threshold.

[0008] In a possible implementation, the microcontroller detects the voltage signal according to the sampling period, and controls the blood pump to stop when the number of times that the voltage signal is less than the second voltage threshold is greater than or equal to a second number threshold.

[0009] In a possible implementation, the control circuit of the ventricular assist device further includes that the microcontroller sets the first voltage threshold and the second voltage threshold corresponding to a speed gear of the blood pump according to the speed gear.

[0010] In a possible implementation, the filter circuit includes a first capacitor, a second capacitor, and a first resistor; the first capacitor is connected in parallel between a first output end and a second output end of the amplification circuit; a first end of the first resistor is connected to a first end of the first capacitor, a second end of the first resistor is connected to a first end of the second capacitor, and a second end of the second capacitor is connected to the second output end and the microcontroller.

[0011] In a possible implementation, the control circuit of the ventricular assist device further includes a first filter capacitor and a second filter capacitor; the first filter capacitor is connected to a first end of the sampling resistor; and the second filter capacitor is connected in parallel across the sampling resistor.

[0012] The application further provides a ventricular assist device, including the control circuit of the ventricular assist device in any of the above implementations, and further including a blood pump; the control circuit of the ventricular assist device is configured to control the blood pump.

[0013] The application further provides a control method of a ventricular assist device, including: isolating a power supply module to supply power to a driving circuit, the driving circuit driving a blood pump; when an output current of the isolated power supply module is greater than a preset current, controlling the isolated power supply module to stop outputting the current to the driving circuit, and when the output current is less than or equal to the preset current, controlling the isolated power supply module to resume outputting the current; converting the output current of the isolated power supply module into a sampling voltage and amplifying the sampling voltage, and filtering out a spike signal in the amplified sampling voltage to obtain a sampling voltage signal; converting the sampling voltage signal into a digital voltage signal, controlling the blood pump to stop when the voltage signal is greater than a first voltage threshold, and controlling the blood pump to stop when the voltage signal is less than a second voltage threshold; and the first voltage threshold is greater than the second voltage threshold.

[0014] In a possible implementation, the controlling the blood pump to stop when the voltage signal is greater than the first voltage threshold comprises: detecting the voltage signal according to a sampling period, and controlling the blood pump to stop when a number of times that the voltage signal is greater than the first voltage threshold is greater than or equal to a first number threshold.

[0015] In a possible implementation, the controlling the blood pump to stop when the voltage signal is less than the second voltage threshold comprises: detecting the voltage signal according to the sampling period, and controlling the blood pump to stop when a number of times that the voltage signal is less than the second voltage threshold is greater than or equal to a second number threshold.

[0016] The control circuit of the ventricular assist device provided in the embodiments of the present application can control the blood pump to stop when the voltage signal is greater than the first voltage threshold, thereby protecting the blood pump from being damaged due to overcurrent, and can also control the blood pump to stop when the voltage signal is less than the second voltage threshold, thereby protecting the human body from being affected by undercurrent of the blood pump and protecting the safety of the human body; the isolation power supply module can stop outputting the current to the driving circuit when the output current of the isolation power supply module is greater than the preset current, thereby protecting the blood pump from being damaged due to overcurrent. Therefore, the control circuit of the ventricular assist device can protect the blood pump and the human body from being damaged during use of the blood pump. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a schematic diagram of a control circuit of a ventricular assist device provided in an embodiment of the present application;

[0018] Figure 2 FIG. 2 is another schematic diagram of a control circuit of a ventricular assist device provided in an embodiment of the present application;

[0019] Figure 3 FIG. 3 is a schematic diagram of a control circuit of a ventricular assist device provided in another embodiment of the present application;

[0020] Figure 4 FIG. 4 is a schematic diagram of a ventricular assist device provided in an embodiment of the present application;

[0021] Figure 5 FIG. 5 is a flowchart of a control method of a ventricular assist device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to make the above objectives, characteristics and advantages of the present application more apparent and comprehensible, the embodiments of the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0023] Referring to Figure 1 FIG. 1 is a schematic diagram of a control circuit of a ventricular assist device provided in an embodiment of the present application.

[0024] The ventricular assist device includes a blood pump 1000. The control circuit of the ventricular assist device provided in this application embodiment includes an isolated power supply module 100, a sampling resistor 200, a drive circuit 300, an amplifier circuit 400, a filter circuit 500, and a microcontroller 600.

[0025] The isolated power supply module 100 is used to supply power to the drive circuit 300, which in turn drives the blood pump 1000. The drive circuit 300 can drive the motor (not shown in the figure) in the blood pump 1000, which in turn drives the blood pump 1000.

[0026] When the output current of the isolation power supply module 100 exceeds the preset current, i.e., when the blood pump 1000 experiences an overcurrent, it performs overcurrent protection by stopping the output current to the drive circuit 300 and thus stopping the power supply to the drive circuit 300, protecting the blood pump 1000 from damage due to overcurrent. When the output current of the isolation power supply module 100 is less than or equal to the preset current, i.e., when the blood pump 1000 recovers from an overcurrent fault to normal operation, it resumes the output current to the drive circuit 300, continuing to supply power to the drive circuit 300 and improving the efficiency of the ventricular assist device.

[0027] This application does not specifically limit the scenario in which overcurrent occurs. For example, it may include overcurrent caused by the blood pump's suction phenomenon or overcurrent caused by flow channel blockage due to thrombosis. This application does not specifically limit the specific value of the preset current, which can be set according to the actual needs of the scenario.

[0028] The sampling resistor 200 is used to acquire the output current of the isolated power supply module 100 and convert it into a sampling voltage.

[0029] This application does not specifically limit the selection of the sampling resistor 200. For example, it can be determined collaboratively based on the range of the output current of the isolation power supply module 100, the input voltage of the drive circuit, and the input voltage level of the microcontroller 600. The larger the resistance value of the sampling resistor 200, the higher the detection accuracy, but the power consumption will also be greater. It can be set according to the actual application requirements.

[0030] Since the maximum sampling voltage converted by the sampling resistor 200 is in the millivolt range, and the reference voltage of the analog-to-digital conversion interface of the microcontroller 600 is in the volt range, in order to improve the sampling accuracy and match the sampling voltage converted by the sampling resistor 200 with the voltage level of the microcontroller 600, this embodiment of the application uses an amplifier circuit 400 to amplify the sampling voltage converted by the sampling resistor 200, and then inputs the amplified sampling voltage into the filter circuit 500.

[0031] The filter circuit 500 is used to filter out spike signals in the amplified sampling voltage output by the amplifier circuit 400.

[0032] The analog-to-digital converter interface of the microcontroller 600 is used to acquire the sampled voltage signal from the filter circuit 500 and convert it into a digital voltage signal. The microcontroller 600 is used for overcurrent protection when the voltage signal exceeds a first voltage threshold, i.e., when the blood pump 1000 experiences overcurrent. The microcontroller 600 sends a drive signal to the drive circuit 300 to stop the blood pump 1000, protecting it from damage due to overcurrent. The process of the microcontroller 600 controlling the blood pump 1000 to stop involves gradually decelerating the blood pump 1000 until it stops completely.

[0033] The embodiments of this application do not specifically limit the specific value of the first voltage threshold. It can be set according to the actual needs of the scenario. For example, it can be set according to the actual situation of different human beings, so as to adapt to individual differences and set the corresponding first voltage threshold accordingly.

[0034] In one possible implementation, in a practical scenario, the first voltage threshold in this embodiment can be set by the host computer software. The control module of the lower-level software receives the first voltage threshold set by the host computer and sends it to the driver module of the lower-level software. The driver module updates the first voltage threshold and performs overcurrent protection according to the updated first voltage threshold. The driver module of the lower-level software may include the microcontroller 600 of this embodiment.

[0035] In one possible implementation, in this embodiment of the application, when the blood pump 1000 experiences an overcurrent, the microcontroller 600 can send a first fault flag signal while controlling the blood pump 1000 to stop. After the blood pump 1000 stops, the operator can determine whether to restart the blood pump 1000 based on the actual application situation.

[0036] During the use of the Blood Pump 1000, not only can excessive current in the motor affect and damage the Blood Pump 1000, endangering human safety, but insufficient current in the motor can also endanger human safety. Damage to the Blood Pump 1000 will lead to insufficient current in the motor; therefore, insufficient current in the motor will endanger human safety and requires immediate replacement of the Blood Pump 1000.

[0037] The microcontroller 600 provided in this application embodiment can not only provide overcurrent protection for the blood pump 1000, but also undercurrent protection for the blood pump 1000, which will be described in detail below.

[0038] The microcontroller 600 is also used to perform undercurrent protection when the voltage signal is less than a second voltage threshold, i.e., when the blood pump 1000 experiences undercurrent. The microcontroller 600 sends a drive signal to the drive circuit 300 to control the blood pump 1000 to stop, protecting the human body from damage due to the undercurrent of the blood pump 1000. The first voltage threshold is greater than the second voltage threshold.

[0039] The embodiments of this application do not specifically limit the scenario in which undercurrent occurs. For example, it may include no-load undercurrent caused by a broken motor shaft of the blood pump.

[0040] This application does not specifically limit the value of the second voltage threshold in its embodiments. It can be set according to the actual needs of the scenario. For example, it can be the same as the first voltage threshold, but the second voltage threshold can be set according to the actual situation of different human bodies. The setting method of the second voltage threshold in this application embodiment can be the same as the setting method of the first voltage threshold, and will not be repeated here.

[0041] In one possible implementation, in this embodiment of the application, when the blood pump 1000 experiences a current shortage, the microcontroller 600 can send a second fault flag signal while controlling the blood pump 1000 to stop. After the blood pump 1000 stops, the staff must immediately replace the blood pump 1000 to protect human safety.

[0042] The control circuit of the ventricular assist device provided in this application embodiment has a microcontroller that can stop the blood pump when the voltage signal is greater than a first voltage threshold, protecting the blood pump from damage due to overcurrent. It can also stop the blood pump when the voltage signal is less than a second voltage threshold, protecting the human body from undercurrent and ensuring human safety. The isolated power supply module can stop supplying current to the drive circuit when its output current exceeds a preset current, protecting the blood pump from damage due to overcurrent. Therefore, the control circuit of the ventricular assist device can provide overcurrent and undercurrent protection for the blood pump during use, protecting both the blood pump and the human body.

[0043] See also Figure 1 In the control circuit of the ventricular assist device provided in this application embodiment, the blood pump 1000 may include multiple speed levels. The multiple speed levels are used to adapt to different physiological states of the human body. For example, the blood pump 1000 may include 9 speed levels, with P1 being the minimum speed level and P9 being the maximum speed level.

[0044] In one possible implementation, the control circuit of the ventricular assist device provided in this application embodiment can set a first voltage threshold and a second voltage threshold corresponding to each speed setting of the blood pump 1000. For example, when the blood pump 1000 is operating at speed setting P1, a first voltage threshold and a second voltage threshold corresponding to speed setting P1 can be set. The microcontroller 600 can perform overcurrent protection on the blood pump 1000 according to the first voltage threshold P1 corresponding to speed setting P1, and perform undercurrent protection on the blood pump 1000 according to the second voltage threshold P1 corresponding to speed setting P1.

[0045] During the use of the Blood Pump 1000, the higher the speed setting of the Blood Pump 1000, the greater the bus current of the Blood Pump 1000, the greater the sampling voltage signal of the filter circuit acquired by the microcontroller 600, and the greater the set first voltage threshold and second voltage threshold.

[0046] For example, comparing the operation of the blood pump 1000 at speed setting P9 and speed setting P1, the bus current of the blood pump 1000 at speed setting P9 is greater than that at speed setting P1; when the blood pump 1000 is operating at speed setting P9, the sampled voltage signal of the filter circuit acquired by the microcontroller 600 is greater than that acquired by the microcontroller 600 at speed setting P1; the first voltage threshold set for P9 when the blood pump 1000 is operating at speed setting P9 is greater than the first voltage threshold set for P1 when the blood pump 1000 is operating at speed setting P1; and the second voltage threshold set for P9 when the blood pump 1000 is operating at speed setting P9 is greater than the second voltage threshold set for P1 when the blood pump 1000 is operating at speed setting P1.

[0047] This application embodiment improves the flexibility and reliability of blood pump protection and increases the efficiency of the blood pump by setting overcurrent protection thresholds and undercurrent protection thresholds corresponding to different speed levels of the blood pump.

[0048] In one possible implementation, this application embodiment may also set specific first voltage threshold and second voltage threshold based on individual differences, while using the same blood pump speed setting, taking into account the individual's condition. This application embodiment does not make specific limitations.

[0049] The control circuit of the ventricular assist device provided in this application embodiment does not specifically limit the timing of the microcontroller performing overcurrent protection.

[0050] See also Figure 1 One possible implementation is that the microcontroller 600 provided in this embodiment can detect the voltage signal according to the sampling period, and control the blood pump 1000 to stop when the number of times the voltage signal is greater than or equal to the first voltage threshold is greater than or equal to the first threshold. The implementation provided in this embodiment can reduce the occurrence of false overcurrent protection triggers, and can avoid the microcontroller 600 controlling the blood pump 1000 to stop when a voltage signal exceeds the first voltage threshold due to a non-overcurrent reason, thus improving the efficiency of the ventricular assist device. For example, during the use of the blood pump, voltage signal spikes may occur due to other interference, causing the voltage signal to exceed the first voltage threshold.

[0051] The embodiments of this application do not specifically limit the sampling period of the microcontroller 600, but can be set according to the actual needs of the scenario. For example, it can be sampled once every 2ms.

[0052] In one possible implementation, in a real-world scenario, the sampling period in this application embodiment can also be set by the host computer software. The control module of the lower-level software receives the sampling period set by the host computer and sends the sampling period to the driver module of the lower-level software. The driver module updates the parameters according to the sampling period and performs overcurrent protection according to the updated parameters. The driver module may include the microcontroller 600 of this application embodiment.

[0053] The embodiments of this application do not specifically limit the threshold for the first number of times, and can be set according to the actual needs of the scenario, for example, it may include 10 times.

[0054] The ventricular assist device provided in this application does not specifically limit the timing of undercurrent protection by the microcontroller.

[0055] See also Figure 1 One possible implementation is that the microcontroller 600 provided in this application embodiment can detect the voltage signal according to the sampling period, and control the blood pump 1000 to stop when the number of times the voltage signal is less than the second voltage threshold is greater than or equal to the second threshold. The implementation provided in this application embodiment can reduce the occurrence of false triggering of undercurrent protection, and can avoid the microcontroller 600 controlling the blood pump 1000 to stop and falsely triggering undercurrent protection when the current signal is less than the second voltage threshold due to non-undercurrent reasons, thereby improving the efficiency of the ventricular assist device.

[0056] This application does not specifically limit the threshold for the second count; it can be set according to the actual needs of the scenario. Similarly, this application does not specifically limit the relationship between the threshold for the first count and the threshold for the second count; it can be set according to the actual needs of the scenario, for example, they can be equal or unequal.

[0057] In the ventricular assist device provided in this application embodiment, the sampling period for overcurrent protection and the sampling period for undercurrent protection of the microcontroller 600 can also be different, and can be specifically set according to the actual scenario needs, which will not be elaborated here.

[0058] See Figure 2 This figure is a schematic diagram of another ventricular assist device provided in an embodiment of this application.

[0059] The sampling resistor provided in this application embodiment can be represented by the sampling resistor R.

[0060] The embodiments of this application do not specifically limit the configuration of the filter circuit, as long as it can filter out the spike signal in the sampled voltage amplified by the amplifier circuit 400.

[0061] One possible implementation, the filter circuit provided in this application embodiment, may include a first capacitor C1, a second capacitor C2, and a first resistor R1.

[0062] A first capacitor C1 is connected in parallel between the first and second output terminals of the amplifier circuit 400. A first resistor R1 is connected to the first terminal of the first capacitor C1, and a second terminal of the first resistor R1 is connected to the first terminal of the second capacitor C2. The second terminal of the second capacitor C2 is connected to the second output terminal of the amplifier circuit 400 and the microcontroller 600. The first capacitor C1, the second capacitor C2, and the first resistor R1 together filter out spike signals in the sampled voltage amplified by the amplifier circuit 400.

[0063] The ventricular assist device provided in this application embodiment may further include a first filter capacitor C3 and a second filter capacitor C4.

[0064] The first filter capacitor C3 is connected to the first end of the sampling resistor R, and the second filter capacitor C4 is connected in parallel across the two ends of the sampling resistor R.

[0065] The first capacitor C3 is used to filter out noise, spurious signals, or high-frequency interference in the output current of the isolated power supply module 100, thereby improving the accuracy of the output current.

[0066] The second filter capacitor C4 is used to filter out high-frequency interference in the sampled voltage signal acquired by the sampling resistor R, making the sampled voltage signal smoother and more stable.

[0067] See Figure 3 The figure is a schematic diagram of the control circuit of another ventricular assist device provided in an embodiment of this application.

[0068] The embodiments of this application do not specifically limit the isolation power supply module and the amplifier circuit, and can be specifically set according to actual use needs.

[0069] One possible implementation is that the isolated power module may include a PM2 power supply.

[0070] In the PM2 power supply, VIN+ is the positive input pin, which can be connected to a 24V power supply, for example; VIN- is the negative input pin, used for grounding; Ctrl is the control pin, which can be left floating in this embodiment; VOUT+ is the positive output pin, used to connect to the first end of the sampling resistor R; VOUT- is the negative output pin, used to connect to the second end of the first capacitor C3; Trim is the output adjustment pin, which can be left floating in this embodiment.

[0071] One possible implementation is that the amplifier circuit may include amplifier U27.

[0072] In amplifier U27, VS is the power input pin, used to connect to the power supply of amplifier U27; IN+ is the positive signal input pin, used to connect to the second terminal of sampling resistor R; IN+ is the negative signal input pin, used to connect to the first terminal of sampling resistor R; REF1 is the positive reference voltage input pin, used to receive the reference voltage; REF2 is the negative reference voltage input pin, used to ground; OUT is the signal output pin, used to connect to the first terminal of the filter circuit through the first terminal of the first resistor R1; GND1 is the ground pin, used for grounding; NC is an empty pin, which can be grounded.

[0073] The ventricular assist device provided in this application embodiment may further include a power supply filter capacitor Cvs and a reference filter capacitor Cref.

[0074] The power supply filter capacitor Cvs is connected to the VS pin of amplifier U27 to filter the input power supply signal of amplifier U27, suppress high-frequency noise, and improve signal stability.

[0075] The reference filter capacitor Cref is connected to the REF1 pin of amplifier U27 to filter the reference voltage signal of amplifier U27, suppress high-frequency noise in the signal, and improve signal stability.

[0076] The ventricular assist device provided in this application embodiment may further include an output resistor R2.

[0077] The output resistor R2 is connected in parallel across the second capacitor C2 to increase the equivalent input impedance of the analog-to-digital conversion interface of the microcontroller 600, reduce the current load on the sampling voltage signal of the filter circuit, reduce the excessive pull-down of the signal amplitude, and improve the integrity and stability of signal transmission.

[0078] Based on the control circuit of the ventricular assist device provided in the above embodiments, this application also provides a ventricular assist device.

[0079] See Figure 4 The figure is a schematic diagram of a ventricular assist device provided in an embodiment of this application.

[0080] The ventricular assist device provided in this application includes the control circuit 10 of the ventricular assist device described above, and also includes a blood pump 1000. The control circuit 10 of the ventricular assist device is used to drive the blood pump 1000.

[0081] The ventricular assist device provided in this application includes a control circuit and a blood pump. The microcontroller in the control circuit can stop the blood pump when the voltage signal exceeds a first voltage threshold, protecting it from overcurrent damage. It can also stop the blood pump when the voltage signal is below a second voltage threshold, protecting the user from undercurrent damage and ensuring safety. The ventricular assist device can also use an isolated power supply module in the control circuit to protect the blood pump from overcurrent damage. This isolated power supply module can stop supplying current to the drive circuit when its output current exceeds a preset current, and resume supplying current when its output current is less than or equal to the preset current. By providing overcurrent and undercurrent protection for the blood pump, the ventricular assist device protects both the blood pump and the user's safety.

[0082] Based on the control circuit and ventricular assist device described in the above embodiments, this application also provides a control method for the ventricular assist device.

[0083] See Figure 5 The figure is a flowchart of a control method for a ventricular assist device provided in an embodiment of this application.

[0084] The control method for the ventricular assist device provided in this application includes:

[0085] S101: The isolated power supply module supplies power to the drive circuit, which in turn drives the blood pump.

[0086] S102: When the output current of the isolation power supply module is greater than the preset current, control the isolation power supply module to stop outputting current to the drive circuit; when the output current is less than or equal to the preset current, control the isolation power supply module to resume outputting current.

[0087] S103: Converts the output current of the isolated power supply module into a sampling voltage and amplifies it, then filters out the spike signals in the amplified sampling voltage to obtain the sampling voltage signal.

[0088] S104: Convert the sampled voltage signal into a digital voltage signal, and control the blood pump to stop when the voltage signal is greater than the first voltage threshold.

[0089] S105: Convert the sampled voltage signal into a digital voltage signal, and control the blood pump to stop when the voltage signal is less than the second voltage threshold.

[0090] The first voltage threshold is greater than the second voltage threshold.

[0091] The control method for the ventricular assist device provided in this application embodiment can control the blood pump to stop when the voltage signal is greater than a first voltage threshold, protecting the blood pump from damage due to overcurrent. It can also control the blood pump to stop when the voltage signal is less than a second voltage threshold, protecting the human body from undercurrent and ensuring human safety. Furthermore, it can stop supplying current to the drive circuit when the output current of the isolation power module is greater than a preset current, protecting the blood pump from damage due to overcurrent. The control method for the ventricular assist device provided in this application embodiment can provide overcurrent and undercurrent protection for the blood pump, protecting both the blood pump and human safety.

[0092] One possible implementation, the control method for the ventricular assist device provided in this application embodiment, controls the blood pump to stop when the voltage signal is greater than a first voltage threshold, includes: detecting the voltage signal according to the sampling period, and controlling the blood pump to stop when the number of times the voltage signal is greater than or equal to the first voltage threshold.

[0093] The implementation method provided in this application can reduce the occurrence of false overcurrent protection. It can avoid stopping the blood pump when a voltage signal caused by non-overcurrent exceeds the first voltage threshold, thus avoiding false overcurrent protection and improving the efficiency of the ventricular assist device.

[0094] One possible implementation, the control method for the ventricular assist device provided in this application embodiment, controls the blood pump to stop when the voltage signal is less than a second voltage threshold, includes: detecting the voltage signal according to the sampling period, and controlling the blood pump to stop when the number of times the voltage signal is less than the second voltage threshold is greater than or equal to the second voltage threshold.

[0095] The implementation method provided in this application can reduce the occurrence of false triggering of undercurrent protection, and can avoid controlling the blood pump to stop when the current signal is less than the second voltage threshold due to non-undercurrent reasons, thus avoiding false triggering of undercurrent protection and improving the efficiency of the ventricular assist device.

[0096] In this application, the terms "first," "second," etc., are used to distinguish identical or similar items that have essentially the same function. It should be understood that there is no logical or temporal dependency between "first," "second," and "nth," nor does it limit the quantity or order of execution. It should also be understood that although the following description uses the terms "first," "second," etc., to describe various elements, these elements should not be limited by the terms. These terms are merely used to distinguish one element from another.

[0097] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0098] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control circuit for a ventricular assist device, the ventricular assist device comprising a blood pump, characterized in that, The control circuit includes: an isolated power supply module, a sampling resistor, an amplifier circuit, a filter circuit, a driver circuit, and a microcontroller; The isolated power supply module is used to supply power to the drive circuit, and the drive circuit is used to drive the blood pump; when the output current is greater than the preset current, the isolated power supply module stops outputting current to the drive circuit, and when the output current is less than or equal to the preset current, it resumes outputting current. The sampling resistor is used to collect the output current of the isolated power supply module and convert it into a sampling voltage; The amplifier circuit is used to amplify the sampled voltage and then input it into the filter circuit; The filtering circuit is used to filter out spike signals in the amplified sampling voltage; The analog-to-digital converter interface of the microcontroller is used to acquire the sampled voltage signal of the filter circuit and convert it into a digital voltage signal; the microcontroller is used to control the blood pump to stop when the voltage signal is greater than a first voltage threshold; the microcontroller is also used to control the blood pump to stop when the voltage signal is less than a second voltage threshold; the first voltage threshold is greater than the second voltage threshold.

2. The control circuit according to claim 1, characterized in that, The microcontroller detects the voltage signal according to the sampling period, and controls the blood pump to stop when the number of times the voltage signal is greater than or equal to the first voltage threshold is greater than or equal to the first threshold.

3. The control circuit according to claim 2, characterized in that, The microcontroller detects the voltage signal according to the sampling period, and controls the blood pump to stop when the number of times the voltage signal is less than the second voltage threshold is greater than or equal to the second threshold.

4. The control circuit according to any one of claims 1-3, characterized in that, Also includes: The microcontroller sets the first voltage threshold and the second voltage threshold corresponding to the speed setting of the blood pump.

5. The control circuit according to any one of claims 1-3, characterized in that, The filter circuit includes a first capacitor, a second capacitor, and a first resistor; The first capacitor is connected in parallel between the first output terminal and the second output terminal of the amplifier circuit; the first end of the first resistor is used to connect to the first end of the first capacitor, the second end of the first resistor is used to connect to the first end of the second capacitor, and the second end of the second capacitor is used to connect to the second output terminal and the microcontroller.

6. The control circuit according to claim 5, characterized in that, It also includes a first filter capacitor and a second filter capacitor; the first filter capacitor is connected to the first end of the sampling resistor; the second filter capacitor is connected in parallel across the two ends of the sampling resistor.

7. A ventricular assist device, characterized in that, The device includes a control circuit for the ventricular assist device according to any one of claims 1-6, and further includes a blood pump; the control circuit of the ventricular assist device is used to control the blood pump.

8. A control method for a ventricular assist device, characterized in that, include: An isolated power supply module supplies power to the drive circuit, which in turn drives the blood pump. When the output current of the isolated power supply module is greater than the preset current, the isolated power supply module is controlled to stop outputting current to the drive circuit; when the output current is less than or equal to the preset current, the isolated power supply module is controlled to resume outputting current. The output current of the isolated power supply module is converted into a sampling voltage and amplified. The spike signals in the amplified sampling voltage are then filtered out to obtain the sampling voltage signal. The sampled voltage signal is converted into a digital voltage signal, and the blood pump is stopped when the voltage signal is greater than a first voltage threshold. If the voltage signal is less than the second voltage threshold, the blood pump is controlled to stop. The first voltage threshold is greater than the second voltage threshold.

9. The control method according to claim 8, characterized in that, The step of controlling the blood pump to stop when the voltage signal is greater than a first voltage threshold includes: detecting the voltage signal according to a sampling period, and controlling the blood pump to stop when the number of times the voltage signal is greater than the first voltage threshold is greater than or equal to the first threshold number.

10. The control method according to claim 9, characterized in that, The step of controlling the blood pump to stop when the voltage signal is less than the second voltage threshold includes: detecting the voltage signal according to the sampling period, and controlling the blood pump to stop when the number of times the voltage signal is less than the second voltage threshold is greater than or equal to the second threshold number.

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