JP4076480B2 - Artificial heart pump system and method for controlling artificial heart pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an artificial heart pump system and a control method of the system, in particular, a plurality of processors in the control unit used in the pump system, and controller and reduce the load on a single processor.
[0002]
[Prior art]
In the conventional auxiliary artificial heart system, in order to make the blood pump body used in the artificial heart compatible with the controller, a sensor circuit for determining the floating position of the impeller (impeller) is built in the pump body. (For example, refer to Patent Document 1).
In addition, as a control method for blood pumps that are used in artificial hearts and heart-lung machines, etc., to bypass or replace the living heart, it is possible to control the fluctuation of pressure load by controlling the current flowing through the blood pump constant. There is also one that suppresses a change in the flow rate of the blood pump to be small (for example, see Patent Document 2).
[0003]
In addition, the blood pump control device is used in the heart-lung machine, and the relationship between the current flowing through the motor of the blood pump device, the motor rotation speed, and the discharge flow rate is stored in advance, from the processor (CPU) in the controller. There is known a centrifugal blood pump device that performs motor current amount control, impeller flying position control, impeller rotational torque control, liquid viscosity calculation, and the like (see, for example, Patent Document 3). .
[0004]
However, the controller described in Patent Document 1 is entirely an analog circuit without having a processor. The controller described in Patent Document 2 includes a processor, but the control by the processor is only a monitor, and the motor and the bearing are controlled by an analog circuit. Further, the controller used in the centrifugal liquid pump device described in Patent Document 3 performs all control of the liquid pump and the display means with one CPU (processor).
[0005]
FIG. 4 shows an example of a conventional portable artificial heart pump system. In this artificial heart pump system, a centrifugal rotary blood pump 50 having an impeller inside is embedded in a human body. And the controller 51 and the two batteries 52 and 53 which supply electric power to this are carried outside and hold | maintained. The controller 51 is provided with a display unit 54 for user interface.
The blood pump 50 is connected to a portable controller 51 by a cable 55 that penetrates the skin.
[0006]
FIG. 5 is a block diagram showing an internal configuration of a controller that is normally used in a conventional artificial heart pump system. This artificial heart pump system includes a blood pump 100 (corresponding to blood pump 50 in FIG. 4) embedded in a human body, a controller 101 (corresponding to controller 51 in FIG. 4) for controlling the operating state of blood pump 100, and It comprises a battery 102 (corresponding to the batteries 52 and 53 in FIG. 4) for supplying power to the power supply circuit of the controller 101.
[0007]
The controller 101 magnetically connects a processor 103 that controls the entire controller, a memory device 104 that stores monitoring data of the operating state of the blood pump 100, operating conditions of the blood pump, and the impeller that constitutes the blood pump 100. A magnetic levitation control circuit 105 that controls the levitation of the motor, a motor drive circuit 106 that controls the drive of the motor that rotates the impeller, and a power supply circuit that supplies power to the processor 103, the memory device 104, the magnetic levitation control circuit 105, and the motor drive circuit 106. 107, a liquid crystal display (LCD) 108 for displaying the rotation speed of the impeller of the blood pump, the blood flow rate, the discharge pressure, and the like, and an LED light emitting element 109 for displaying whether the operation of the blood pump and the controller is normal or abnormal. And a buzzer to notify the abnormality of the blood pump and the controller. 110, and a command button 111 for instructing to change the operation of the blood pump to the processor 103.
[0008]
The operation of the conventional artificial heart pump system shown in FIG. 5 will be described below. The impeller (impeller) provided in the blood pump 100 is controlled so as to be magnetically levitated by the magnetic levitation control circuit 105 and is controlled by the motor driving circuit 106 so as to rotate at a stable rotational speed. The number of rotations of the motor for rotating the impeller is set by the doctor in consideration of the viscosity of the patient's blood, the discharge flow rate, etc., but is usually about 1800 rpm to 2200 rpm.
[0009]
Further, the processor 103 receives signals from the magnetic levitation control circuit 105 and the motor drive circuit 106, stores necessary information in the memory device 104, and displays the operating state of the blood pump 100 on a liquid crystal display (LCD) 108. To do. The display contents of the LCD 108 are the rotation speed of the impeller, the blood flow rate, the discharge pressure of the blood pump, and the like.
[0010]
Furthermore, when the abnormality of the blood pump 100 is detected, the processor 103 changes the display color of the LED light emitting element 109 from green to red and activates the buzzer 110 to generate an alarm sound. The memory device 104 not only records the operating state of the blood pump 100 but also stores condition settings for operating the blood pump in advance. The processor 103 stores the setting values stored in the memory device 104. Is read and the operating state of the blood pump 100 is controlled.
[0011]
[Patent Document 1]
JP 2001-327595 A [Patent Document 2]
JP-A-9-56812 [Patent Document 3]
Japanese Patent Laid-Open No. 11-76394
[Problems to be solved by the invention]
However, in the conventional artificial heart pump system shown in FIG. 5, the controller 101 has only one processor 103. For this reason, the processor 103 must perform all the processes in the controller 101.
That is, the processor 103 must perform all of the magnetic levitation control of the pump 100, the motor rotation speed control, the data storage process, the data display process, the alarm ringing process, and the like.
[0013]
This means that a very heavy load is required for the processor 103, and it means that a high-performance processor having a performance capable of executing all of it must be mounted. In other words, it also requires a high cost for the processor.
[0014]
In addition, when all the processing is performed by one processor 103 in this way, the software that operates on the processor 103 becomes complicated, which reduces productivity and maintainability. A great deal of cost is required.
[0015]
Furthermore, when this processor 103 stops due to some trouble, the controller 101 cannot continue all the above processes. If this happens, the controller 101 may stop functioning and cannot issue an alarm. In an artificial heart pump system, it is most important to continue the operation of the pump safely, and the above-mentioned conventional artificial heart pump system using a single processor prepares a higher-performance processor in order to ensure security. There was a need.
[0016]
In order to solve the above problems, the present invention provides two processors for the control system and the display system, and reduces the processing performed by each processor, thereby eliminating the need for complicated software and improving the performance of the hardware. It is an object of the present invention to provide a controller for an artificial heart pump system that does not need to be specially sophisticated.
[0017]
[Means for Solving the Problems]
In order to solve the above problems and achieve the object of the present invention, an artificial heart pump system of the present invention includes a blood pump implanted in the body, a control processor provided outside the body and controlling the blood pump, and also provided outside the body. An artificial heart pump system comprising a monitoring processor for controlling a display unit for displaying the operating state and operating conditions of the blood pump, wherein the monitoring processor is provided separately from the control processor. Controls the blood pump based on the operating state detection signal acquired from the blood pump, determines whether the monitoring processor is in a stopped state, and if the monitoring processor is in a stopped state, A control signal is sent to the monitoring processor to put the monitoring processor in an operating state, and the monitoring processor is different from the control processor. There when the stopped state is generated, and transmits a reset signal to the control processor, it is characterized in that to return to the operating state.
[0018]
In a preferred embodiment of the present invention, the operating state detection signal acquired from the blood pump is magnetic levitation data of the blood pump, and the levitation state of the impeller in the blood pump is controlled based on the magnetic levitation data. I have to.
[0019]
Furthermore, as a preferred embodiment of the present invention, a memory device for storing the operating state of the blood pump is provided, and this memory device is controlled by a monitoring processor.
[0021]
Furthermore, the method for controlling an artificial heart pump according to the present invention includes a blood pump implanted in the body, a control processor provided outside the body for controlling the blood pump, and an operating state and operating conditions of the blood pump provided outside the body. A method for controlling an artificial heart pump comprising a monitoring processor for controlling a display unit for display, wherein a detection signal for the operating state of a blood pump is obtained by a control processor provided separately from the monitoring processor. There is an error in the step of calculating the control output, the step of obtaining the rotation data of the motor of the blood pump by the control processor and calculating the rotation control output of the motor, and the rotation control data of the motor. In this case, an error occurrence flag is transmitted to the monitoring processor to set the monitoring processor in an operating state, and this control The step of detecting an abnormality of the control processor by the monitoring processor based on the error occurrence flag of the processor, the step of displaying the abnormality by the display unit when there is an abnormality in the control processor, and the monitoring processor, A step of determining whether or not the control processor is in a stopped state; and a step of returning the control processor to an operating state by sending a reset signal from the monitoring processor to the control processor if the control processor is in a stopped state. It is characterized by including.
[0022]
According to the artificial heart pump system and the control method used therefor according to the present invention, a plurality of processors functioning as the central part of the control device of the pump system are divided into a control system and a display system to reduce the processing performed by one processor. Therefore, the software complexity of each processor can be reduced. And the processor mounted in a control apparatus can be restrained cheaply.
[0023]
Furthermore, by installing a plurality of processors, even if one processor is suspended, other processors can continue to operate independently, so the entire system does not stop and is effective for safety measures. .
[0024]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram showing an embodiment of an artificial heart pump system using a multiprocessor according to the present invention. This artificial heart pump system includes a controller (control device) 1, a blood pump 2, and a battery 3.
[0025]
As shown in FIG. 1, the controller 1 includes two processors: a control processor 4 that controls the blood pump 2 and a control system in the controller 1, and a monitoring processor 5 that controls the display system. In addition to the control processor 4 and the monitoring processor 5, the controller 1 rotates the impeller, and a magnetic levitation control circuit 6 that magnetically levitates the impeller in the blood pump 2 and controls its levitation position. A motor drive circuit 7 for driving the motor, a memory device 8 for receiving and storing data indicating the operating state of the blood pump 2 from the monitoring processor 5, the control and monitoring processors 4 and 5, and the magnetic levitation control circuit 6 A power supply circuit 9 for supplying electric power to the motor drive circuit 7 and the memory circuit 8, a liquid crystal display (LCD) 10 for displaying the number of revolutions of the impeller of the blood pump 2, the flow rate of blood, or the discharge pressure, and the blood pump 2 and a light emitting element (LED) 11 as an abnormality display means for displaying whether the operation of the controller 1 is normal, the blood pump 2 and the controller A buzzer 12 as abnormality notification unit for notifying the abnormality, and to the monitoring processor 5 from instruction button 13 for instructing to change the operation of the blood pump 2.
In FIG. 1, a thin solid line indicates a control signal, a dotted line indicates a data signal flow, and a thick solid line indicates power supply.
[0026]
The operation of the example of the embodiment of the present invention shown in FIG. 1 will be described below. In this example, the control processor 4 and the monitoring processor 5 operate in cooperation with each other so as to reduce each other's load. That is, the control processor 4 controls the magnetic levitation control circuit 6 and the motor drive circuit 7 to control the magnetic levitation position of the impeller in the blood pump 2, as indicated by the thin solid arrow in FIG. The rotation of the motor that drives the motor is controlled.
[0027]
On the other hand, the floating position data of the impeller in the blood pump 2 is detected by a detector (not shown) and supplied to the control processor 4 and the monitoring processor 5 via the magnetic levitation control circuit 6. A data signal for detecting the number of rotations of the motor is also supplied to the control processor 4 and the monitoring processor 5 via the motor drive circuit 7.
[0028]
The control processor 4 receives the detection signal of the operating state from the blood pump 2 as described above, and controls the magnetic levitation control circuit 6 and the motor drive circuit 7. Then, the monitoring processor 5 always stores a data signal representing the operating state of the blood pump 2 in the memory device 8 and displays it on the liquid crystal display device (LCD) 10. The content displayed on the LCD 10 can be appropriately set according to the patient who is the user, but the set discharge flow rate and the effective discharge flow rate, the set discharge pressure and the effective discharge pressure, the blood temperature, the blood viscosity, The number of revolutions of the impeller can be considered.
[0029]
In addition, when an abnormality occurs in the blood pump 2, the monitoring processor 5 changes the display color of the LED 11 as the abnormality display means from, for example, green to red to notify the user of the abnormality, and as an abnormality notification means. The buzzer 12 is activated and an alarm sound is emitted. Further, when the user or doctor changes the setting of the operating condition or the like of the blood pump 2, the change instruction control signal is sent to the monitoring processor 5 by operating the change instruction button 13.
Then, this control signal is sent from the monitoring processor 5 to the memory device 8 to rewrite the set value stored in the memory device 8 and sent to the control processor 4 to send the magnetic levitation control circuit 6 and the motor drive circuit. 7 is changed.
[0030]
Next, the operation of the artificial heart pump system of the present invention will be described in more detail based on the flow charts of FIGS. FIG. 2 is a flowchart for explaining the operation of the control processor 4 of the controller 1 of the system of the present invention, and FIG. 3 is a flowchart for explaining the operation of the monitoring processor 5.
[0031]
First, the operation of the control processor 4 will be described based on the flowchart of FIG. First, magnetic levitation data is acquired from the magnetic levitation control circuit 6 by the control processor 4 (step S1). Based on the acquired data, the control processor 4 calculates a control output for controlling the floating state of the impeller in the blood pump 2 (step S2), and outputs this to the magnetic levitation control circuit 6 (step S3). . The impeller magnetic levitation control is completed in steps S1 to S3.
[0032]
Next, in the control processor 4, motor rotation speed data is acquired from the motor drive circuit 7 (step S4). The control processor 4 calculates control data for controlling the rotational speed of the motor based on the acquired data (step S5), and supplies this to the motor drive circuit 7 (step S6). The motor speed control is completed in steps S4 to S6.
[0033]
When the impeller magnetic levitation control and motor rotation control are completed, it is subsequently determined whether or not the acquired data is abnormal (step S7). If there is no abnormality in the acquired data (no error), it is next determined whether or not the monitoring processor 5 is in a stopped state (step S8). If the monitoring processor 5 is in the operating state, the process returns to step S1 in the first stage, and again shifts to the magnetic levitation data acquisition cycle. When the monitoring processor 5 is in the stopped state, the control processor 4 A control signal (reset signal) is sent to the monitoring processor 5 to reset the monitoring processor 5. That is, the operation state is set (step S10). If it is determined in the determination step S7 that there is an abnormality (there is an error), the error occurrence flag is set to ON (step S9), and the process proceeds to step S8.
[0034]
Next, the operation of the monitoring processor 5 will be described based on the flowchart of FIG.
First, the monitoring processor 5 stores the acquired data in the memory of the memory device 8 (step S11). Subsequently, it is determined whether or not the display data displayed on the LCD 10 is changed (step S12). If there is a change in the display data, the data display is updated (step S13) and the process proceeds to the next step. Steps S11 to S13 are data processing steps.
[0035]
If it is determined in the determination step S12 that the display data is not changed, the process proceeds to the next step as it is, and it is confirmed whether or not the error occurrence flag of the control processor 4 is ON (step S14). Then, as a result of checking the error occurrence flag, it is determined whether or not there is an error (step S15).
[0036]
If it is determined in step S15 that there is an error, the process proceeds to an error processing flow in step S15 and subsequent steps. First, an error display for changing the emission color of the LED 11 from, for example, green to red is performed (step S16), and then the buzzer 12 is sounded to generate an alarm sound (step S17). Finally, the error data is stored in the memory device 8 through the monitoring processor 5 of the controller 1 (step S18).
[0037]
If it is determined in step S15 that there is no error, it is determined whether or not the control processor 4 is in a stopped state (step S19). If the result of this determination is that the control processor 4 is in a stopped state, a reset signal is transmitted from the monitoring processor 5 to the control processor 4 to place the control processor 4 in the reset state, ie, the operating state (step) S20).
If it is determined in the determination step S19 that the control processor 4 is not stopped, the process returns to the data processing step again.
[0038]
According to the embodiment of the present invention, as described above, the controller 1 for controlling the operating state of the blood pump 2 in the controller 1 and the collection or display of the collected data from the blood pump 2 are performed. A monitoring processor 5 is arranged, and the two processors are linked by communication or the like.
As a result, the control processor 4 can control only the pump independently of the data display and storage processing. Therefore, even if the monitoring processor 5 stops its processor function, Can be maintained.
[0039]
The two processors cooperate with each other to perform mutual monitoring, so that even when the control processor 3 stops its pump control function, the monitoring processor 5 for displaying and storing collected data does not stop simultaneously. As long as an abnormality can be detected, the recovery process can be performed with the abnormality detection as a trigger. That is, when it is detected that the monitored partner's processor has stopped, it is possible to quickly return to the original state by sending a reset signal to the partner.
[0040]
For this reason, it is possible to prevent the entire artificial heart pump system from being stopped, and to make the monitoring processor 5 display and store the collected data and to control the operating state of the blood pump 2 to the control processor 4. Since processing can be shared, the load on each processor is reduced.
[0041]
Accordingly, the operational stability of the control and monitoring processors 4 and 5 can be improved, and a relatively low-function element can be used for each processor. Can be kept low. Furthermore, the software used for the control and monitoring processors can be kept small.
[0042]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the controller of the highly reliable artificial heart pump system which can maintain the operation | movement of a pump as much as possible also when trouble arises in an auxiliary artificial heart pump system is implement | achieved.
Furthermore, according to the present invention, when one processor is stopped by mounting a plurality of processors, other processors can continue to operate independently, so that the entire system is hardly stopped. It is also effective for safety measures.
[Brief description of the drawings]
FIG. 1 is a block configuration diagram showing an embodiment of an artificial heart pump system using a multiprocessor of the present invention.
FIG. 2 is a flowchart for explaining the operation of the control processor of the artificial heart pump system of the present invention.
FIG. 3 is a flowchart for explaining the operation of the monitoring processor of the artificial heart pump system of the present invention.
FIG. 4 is a diagram showing an arrangement relationship when a conventional artificial heart pump system is carried by a human body.
FIG. 5 is a block diagram showing a conventional artificial heart pump system using a single processor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 51,101 ... Controller 2, 50, 100 ... Blood pump 3, 52, 53, 102 ... Battery, 54 ... Display part, 55 ... Skin penetration cable, 4. ..Control processor, 5 ... Monitoring processor, 103 ... Processor, 6, 105 ... Magnetic levitation control circuit, 7,106 ... Motor drive circuit, 8,104 ... Memory device, 9, 107 ... power supply circuit, 10, 108 ... liquid crystal display (LCD), 11, 109 ... light emitting element (LED), 12, 110 ... buzzer, 13, 111 ... button ( For instructions)

Claims (5)

A blood pump implanted in the body, a control processor provided outside the body for controlling the blood pump, and a monitoring processor also provided outside the body for controlling a display unit for displaying the operating state and operating conditions of the blood pump. An artificial heart pump system comprising:
The monitoring processor is provided separately from the control processor,
The control processor controls the blood pump based on an operating state detection signal acquired from the blood pump, determines whether the monitoring processor is in a stopped state, and the monitoring processor If it is in a stopped state, send a control signal to the monitoring processor to bring the monitoring processor into an operating state,
The artificial heart pump system , wherein the monitoring processor sends a reset signal to the control processor to return to an operating state when an abnormality occurs in the control processor and the monitoring processor is stopped .   The operating state detection signal acquired from the blood pump is magnetic levitation data of the blood pump, and the levitation state of the impeller in the blood pump is controlled based on the magnetic levitation data. The described artificial heart pump system.   3. The artificial device according to claim 1, wherein the monitoring processor includes a memory device that stores an operating state of the blood pump, and stores data transmitted from the control processor in the memory device. Heart pump system. When the setting of the operating condition of the blood pump is changed by a user or a doctor , the control processor sends a control signal for a change instruction to the monitoring processor,
The monitoring processor transmits a change instruction command from the control processor to the control processor,
The artificial heart pump system according to any one of claims 1 to 3, wherein the control processor changes a setting of an operating condition of the blood pump in response to an instruction from the monitoring processor . A control method for an artificial heart pump comprising: a blood pump; a control processor for controlling the blood pump; and a monitoring processor for controlling a display unit for displaying an operating state and operating conditions of the blood pump ,
Obtaining a detection signal of the operating state of the blood pump by the control processor provided separately from the monitoring processor, and calculating the control output;
Obtaining rotation data of the motor of the blood pump by the processor for control and calculating a rotation control output of the motor;
If there is an error in the rotation control data of the motor, sending an error occurrence flag to the monitoring processor to put the monitoring processor in an operating state;
Detecting an abnormality of the control processor based on an error occurrence flag of the control processor by the monitoring processor provided separately from the control processor;
If there is an abnormality in the control processor, performing an abnormality display by the display unit;
Determining by the monitoring processor whether the control processor is in a stopped state;
When the control processor is in a stopped state, a step of sending a reset signal from the monitoring processor to the control processor to return the control processor to an operating state.
A method for controlling an artificial heart pump, comprising:

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