JP4076478B2 - Artificial heart pump system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pump system for an artificial heart, and more particularly to a system controller for controlling a pump for an artificial heart and a user interface module used therefor.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a blood pump device used for an artificial heart, a sensor circuit for determining a floating position of an impeller (impeller) is incorporated in the pump body in order to make the pump body and controller compatible (for example, a patent Reference 1)), or a blood pump control method that is used for an artificial heart, an artificial heart-lung machine, or the like, and that assists or completely replaces the living heart by bypassing it, by controlling the current flowing through the blood pump constant. There is known a device in which a change in the flow rate of a blood pump is suppressed to a small amount with respect to a change in pressure load (see, for example, Patent Document 2). In addition, the relationship between the current flowing through the motor and the flow rate, and the relationship between the current and the pressure are obtained in advance, and the number of rotations of the motor is variably controlled based on these correlations according to commands from the CPU. A magnetic levitation pump to be controlled is also known (see, for example, Patent Document 3).
[0003]
Even in the devices described in these prior art documents, the controller of the entire system includes a user interface such as a display unit. For example, also in the control circuit (controller) of the magnetic levitation pump described in Patent Document 2 and Patent Document 3, a rotation speed display unit that displays the rotation speed of the impeller, a flow rate display unit that displays the blood flow rate, and a discharge pressure Is provided. These controllers are usually used by patients, and patients can go directly to the controllers or apply operations to check the operating status of pumps and change conditions. It may be necessary.
[0004]
FIG. 4 shows an example of a conventional artificial heart pump system. This artificial heart pump system includes a device part embedded in a human body and a device part held outside the human body. The part embedded in the human body is the part of the blood pump 50. The parts held outside are a portable controller 51 and two batteries 52 and 53 that supply power to the portable controller 51. The controller 51 is provided with a display unit 54 for user interface. Blood pump 50 and controller 51 are connected by a cable 55 that penetrates the skin.
[0005]
FIG. 5 shows a block diagram of a conventional artificial heart pump system that is generally used. This artificial heart pump system includes a blood pump 100 implanted in a human body, a controller 101 for controlling the operating state of the blood pump 100, and a battery 102 for supplying power to a power supply circuit of the controller 101. The controller 101 magnetically connects the processor 103 that controls the entire controller, the memory device 104 that stores the monitoring results of the operating state of the blood pump, the operating conditions of the blood pump, and the impeller that constitutes the blood pump 100. A magnetic levitation control circuit 105 for levitating, a motor drive circuit 106 for driving a motor for rotating the impeller, a processor 103, a memory device 104, a magnetic levitation control circuit 105, a power supply circuit 107 for supplying power to the motor drive circuit 106, A liquid crystal display (LCD) 108 for displaying the rotation speed of the impeller of the blood pump, a blood flow rate, or a discharge pressure, a light emitting element (LED) 109 for displaying the operating state of the blood pump and the controller, the blood pump and the above A buzzer 110 for notifying a controller abnormality and a processor And a command button 111 for instructing the change of the operating state of the blood pump with respect to 03.
[0006]
The operation of the conventional artificial heart pump system shown in FIG. 5 will be described. 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. (For example, see Patent Document 3)
[0007]
The processor 103 also 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 a control state of the blood pump 100 on a liquid crystal display device (LCD) 108. Like to do. The display contents of the LCD 108 may be the impeller rotation speed, blood flow rate, blood pump discharge pressure, and the like.
[0008]
Further, when detecting an abnormality in the blood pump 100, the processor 103 changes the display color of the LED 109 from, for example, green to red, or activates the buzzer 110 to generate an alarm sound. The memory device 104 not only stores the operating state of the blood pump 100 but also stores setting conditions for operating the blood pump 1 in advance. The processor 103 stores the setting stored in the memory device 104. A value is read to control the operating state of the blood pump 100.
[0009]
[Patent Document 1]
JP 2001-327595 A [Patent Document 2]
JP-A-9-56812 [Patent Document 3]
Japanese Patent Laid-Open No. 8-270595
[Problems to be solved by the invention]
However, when a patient (user) carrying the artificial heart controller 101 described in each of the above prior arts performs an operation such as checking the display contents of the controller 101 or changing the setting, the controller must be exposed to the outside. There was a problem that had to be done. In addition, it is often difficult for the user to hear the alarm even when the controller is under clothes or the like. Furthermore, the display and operation unit of the controller, that is, the user interface part is the part that the user directly operates, so it is considered one of the most prone to failure, but in the case of a conventional controller when the user interface fails There was the inconvenience of having to stop the system once and replace all the controllers.
The present invention solves the above-described problems, enables the user to check the display contents of the controller without exposing the controller to the outside, and ensures that the user can hear when an alarm such as a buzzer occurs. It is an object of the present invention to provide an artificial heart pump system and a user interface unit used therefor.
[0011]
[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 according to the present invention includes a blood pump implanted in the body, a controller for controlling the blood pump carried outside the body, and the controller It is an artificial heart pump system provided with a user interface unit for commanding . The user interface unit used in this artificial heart pump system includes a display unit for monitoring the operating state of the blood pump, an instruction unit for changing the control state of the blood pump, the rotation speed of the impeller of the blood pump, the flow rate of blood, Alternatively, a liquid crystal display unit for displaying the discharge pressure, an LED light emitting element for displaying the operating state of the blood pump and the controller, and a buzzer for notifying the abnormality of the blood pump and the controller are provided. The user interface unit and the controller are each independently provided with a processor and a power supply circuit, and the user interface unit is separated from the controller and connected to the controller via a wired or wireless communication line . .
[0015]
According to the artificial heart pump system of the present invention, by providing a user interface unit separately from the system controller, it is not necessary to expose the controller when confirming or operating the display, and an alarm function is mounted on the user interface unit. By doing so, the alarm sounds at hand, so it is possible to prevent the alarm from being missed.
Further, by making this module detachable, it is possible to replace only the user interface unit without stopping the controller when the user interface portion fails.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an overall configuration when the artificial heart pump system of the present invention is carried, and is connected to the blood pump 1 by a blood pump 1 embedded in a human body and a cable 7 penetrating the skin, For example, it comprises a controller 2 carried outside the body such as a belt portion, batteries 3 and 4 as power supply sources to the controller 2, and a user interface unit 5 that displays the operating state of the blood pump 1. This blood pump 1 connects the inflow port of the blood pump 1 to the left ventricle of the heart, and connects the outflow port to the aorta to bypass the blood and ensure the blood flow of the patient whose heart function is reduced. ing.
[0017]
The user interface unit 5 is connected to the controller 2 by a cable 6 and receives a signal from the controller 2, and displays the operating state of the blood pump 1, that is, the number of revolutions of the impeller, the flow rate of blood, and the discharge pressure. The display part which performs is provided. In addition, an instruction button used when a user or doctor who is a patient changes the setting of the operating condition for the system is also provided.
[0018]
FIG. 2 is a block diagram showing the overall configuration of the artificial heart pump system of the present invention. The difference from the conventional artificial heart pump system shown in FIG. 4 is that the user interface unit 5 is provided independently of the controller 2.
The user interface 5 is connected to the controller 2 by a cable 6 shown in FIG. 1, but this connection can also be made by a wireless LAN or the like.
[0019]
The controller 2 includes a processor 8 that controls the blood pump 1 and the entire controller, a memory device 9 that stores monitoring results of the operating state of the blood pump, operating conditions of the blood pump, and the impeller in the blood pump 1 in a magnetic manner. A magnetic levitation control circuit 10 that floats on a motor, a motor drive circuit 11 that drives a motor that rotates an impeller, a processor 8, a memory device 9, a magnetic levitation circuit 10, and a power supply circuit 12 that supplies power to the motor drive circuit 11. Is done.
[0020]
On the other hand, the user interface unit 5 connected to the controller 2 via a cable or wireless LAN or the like includes a user interface processor 13 connected to the processor 8 of the controller 2, the rotation speed of the impeller of the blood pump 1, the blood flow rate, Alternatively, a liquid crystal display (LCD) 14 that displays discharge pressure and the like, a light emitting element (LED) 15 that displays the operating state of the blood pump and the controller, a buzzer 16 that notifies abnormality of the blood pump and the controller, and a processor 13 Are provided with an instruction button 17 for instructing to change the operation of the blood pump, a power supply circuit 18 for supplying power to the processor 13 and the LCD 14, and a battery 19 as a drive source of the power supply circuit 18. In FIG. 2, the supply of power is indicated by thick solid arrows, the flow of control signals is indicated by thin solid arrows, and the flow of data is indicated by dotted arrows.
[0021]
Next, operation | movement of the artificial heart pump system of this invention is demonstrated based on the flowchart shown in FIG. First, in the flowchart of FIG. 3, the magnetic levitation data is acquired from the magnetic levitation control circuit 10 by the processor 8 (step S1). Based on the acquired data, the processor 8 calculates a control output of the impeller levitation state in the blood pump 1 (step S2), and outputs this to the magnetic levitation control circuit 10 (step S3). The impeller magnetic levitation control is completed in steps S1 to S3.
[0022]
Next, in the processor 8, motor rotation data is acquired from the motor drive circuit 11 (step S4). The control processor 8 calculates motor rotation control data based on the acquired data (step S5), and supplies it to the motor drive circuit 11 (step S6). The motor rotation control is completed in steps S4 to S6.
[0023]
When the impeller magnetic levitation control and the motor rotation control are completed, the processor 8 stores the acquired data in the memory device 9 (step S7). Thereafter, it is determined whether or not to change data displayed on the LCD 14 of the user interface unit 5 (step S8). When it is necessary to change the display data, the processor 13 of the user interface unit 5 is instructed to change the display data from the button 17 of the user interface unit 5 or a keyboard or touch panel (not shown) to update the data display (step S9). ). The processing from step S7 to step S9 is a data processing step.
[0024]
Subsequently, it is determined whether there is an abnormality in the display data (step S10). If there is an abnormality in the display data (there is an error), an error display such as changing the emission color of the LED 15 of the user interface unit 5 from green to red, for example, is performed (step S11) and the buzzer 16 is sounded (step S12). ). The error data is stored in the memory device 9 through the processor 8 of the controller 2 (step S13). When it is determined that there is no error in the determination step S10, the process returns to the first step S1 to acquire magnetic levitation data.
[0025]
According to the embodiment of the artificial heart pump of the present invention, the user interface portion can be excluded from the controller 2 by making the controller 2 and the user interface unit 5 of the artificial heart pump independent as separate modules. This eliminates the need for direct access to the controller when checking the controller display or performing operations, and the patient can hide the controller under clothing or the like. In addition, by including the buzzer 16 in the user interface unit 5, it is possible to make an alarm sound near the ear, thereby preventing the alarm from being missed.
[0026]
Further, since the controller 2 and the user interface unit 5 can be detachably connected using a connector, the user interface unit 5 can be detached and used as a simpler system when unnecessary. Further, even when the user interface unit fails, it is possible to recover without stopping the system by exchanging only the tip from this connector.
Furthermore, since the user interface portion can be removed from the hardware and software in the controller, both the controller 2 and the user interface unit 5 can be changed to simple ones.
[0027]
Therefore, the controller 2 used in the artificial heart pump system of the present invention can be made smaller than before, and the software can improve productivity, maintainability, and reliability.
[0028]
【The invention's effect】
According to the artificial heart pump system of the present invention, even when the operating state of the blood pump 1 is confirmed, it is possible to confirm and operate the display with only the user interface unit at hand, without exposing the controller 2 to the outside of the clothes. is there. Further, the controller can be miniaturized by removing hardware related to the user interface from the controller. Furthermore, since the load on the processor 8 of the controller 2 can be reduced, a relatively inexpensive processor can be selected.
Further, even when the user interface unit 5 breaks down, it is not necessary to stop the controller 2 one by one, and the function can be restored by replacing only the user interface unit.
By employing the artificial heart pump system and the user interface unit of the present invention, it is possible to realize a highly reliable artificial heart assist system that is easy to operate and can be operated continuously.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram showing a positional relationship when components of an artificial heart pump system of the present invention are carried by a human body.
FIG. 2 is a block configuration diagram showing an embodiment of an artificial heart pump system of the present invention.
FIG. 3 is a flowchart for explaining the operation of the artificial heart pump system of the present invention.
FIG. 4 is a diagram showing a configuration relationship between components of a conventional artificial heart pump system and a human body.
FIG. 5 is a block diagram showing a conventional artificial heart pump system.
[Explanation of symbols]
1, 50, 100 ... Blood pump, 2, 51, 101 ... Controller, 3, 4, 19, 52, 53, 102 ... Battery, 5, 54 ... User interface unit, 6 ....・ Cable, 7, 55 ... Skin penetration cable, 8, 13, 103 ... Processor, 9, 104 ... Memory device, 10, 105 ... Magnetic levitation control circuit, 11, 106 ... Motor Drive circuit, 12, 18, 107 ... power supply circuit, 14, 108 ... liquid crystal display (LCD), 15, 109 ... light emitting element (LED), 16, 110 ... buzzer, 17, 111 ... Buttons (for instructions)

Claims (1)

In an artificial heart pump system comprising: a blood pump implanted in the body; a controller that controls the blood pump that is carried outside the body; and a user interface unit that commands the controller .
The user interface unit includes a display unit for monitoring an operating state of the blood pump, an instruction unit for changing a control state of the blood pump, a rotation speed of an impeller of the blood pump, a blood flow rate, or a discharge pressure. A liquid crystal display to display;
An LED light emitting element for displaying the operating state of the blood pump and the controller, and a buzzer for notifying abnormality of the blood pump and the controller,
The user interface unit and the controller are each independently provided with a processor and a power supply circuit, and the user interface unit is separated from the controller and connected to the controller via a wired or wireless communication line .
An artificial heart pump system characterized by that.

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