JP4230640B2 - Blood pump device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a blood pump device, and more particularly, to a blood pump device that is used in an artificial heart or the like and feeds blood by magnetically levitating an impeller (impeller) with a magnetic bearing.
[0002]
[Prior art]
FIG. 13 is a longitudinal sectional view showing an example of a pump body of a conventional blood pump apparatus. In FIG. 13, the housing 1 of the pump main body is partitioned by partition walls 11, 12, 13 and 14, and an electromagnet part 20, a pump part 30 and a motor part 40 are formed. An electromagnet 21 and a magnetic bearing sensor 22 are built in the electromagnet portion 20. An inflow port 15 through which blood flows is formed at the center of one side surface of the casing 1, and at least three electromagnets 21 and magnetic bearing sensors 22 are arranged around the inflow port 15. The electromagnet 21 and the magnetic bearing sensor 22 are attached to the inner wall surface of the partition wall 11 that partitions the outside and the electromagnet portion 20.
[0003]
An impeller (impeller) 31 is rotatably accommodated in the pump portion 30, and the electromagnet portion 20 side (one side) of the impeller 31 is supported by the electromagnet portion 21 through the partition wall 12 in a non-contact manner. The distance between the impeller 31 and one side is detected by the sensor 22. A permanent magnet 32 is embedded on the other side of the impeller 31.
[0004]
A motor stator 41 and a motor rotor 42 are accommodated in the motor unit 40, and the motor stator 41 has an outer periphery of a cylindrical member 43 formed so as to extend in a cylindrical shape from the inner wall surface of the partition wall 14 that partitions the outside and the motor unit 40. The rotating shaft of the motor rotor 42 is supported on the inner peripheral surface of the cylindrical member 43 via a motor bearing 44 formed of a rolling bearing. The motor rotor 42 is provided with a permanent magnet 47 so as to face the electromagnet 46 of the motor stator 41, and the motor rotor 42 is supported by a motor bearing 44 and rotates by these magnetic forces. A permanent magnet 45 is embedded on the surface of the motor rotor 42 facing the pump unit 30 so as to face the permanent magnet 32 embedded in the impeller 31 through the partition wall 13.
[0005]
In the blood pump device configured as described above, based on the sensor output of the magnetic bearing sensor 22, the current flowing through the electromagnet 21 is controlled by the controller 10 described later, and the attraction force of the electromagnet 21 to the opposite surface of the impeller 31 is reduced. Be controlled.
[0006]
On the other hand, an attractive force composed of permanent magnets 32 and 45 acts on the motor unit 40 side of the impeller 31, and the impeller 31 is constituted by an uncontrolled bearing by the permanent magnets 32 and 45 and a controlled bearing by the electromagnet 21. 31 is magnetically levitated, the impeller 31 is rotated by the driving force of the motor unit 40, and the blood that has flowed into the inflow port 15 is discharged from a discharge port (not shown) formed in the pump unit 30.
[0007]
In FIG. 14, the controller 10 monitors the operation status of the sequence circuit 101 to which a control signal such as a rotation command and a levitation command is supplied from the outside, the AC / DC converter 102 to which AC power is supplied, and the blood pump, And a monitor circuit 103 that performs communication between them. The AC / DC converter 102 converts the AC voltage into a DC voltage, and applies a DC voltage to the motor power amplifier 104, the magnetic bearing power amplifier 124, and the DC / DC converter 105. The DC / DC converter 105 stabilizes the DC voltage and supplies the DC voltage to the circuit described below.
[0008]
Furthermore, the controller 10 includes a sensor circuit 110, and the sensor circuit 110 includes a carrier wave generation circuit 111, a tuning circuit 112, and an amplifier 113. Carrier wave generated from the carrier wave generating circuit 111 Ru is supplied to the magnetic bearing sensor 22 of the pump body side of the housing 1 via a connector 150. As shown in FIG. 13, the magnetic bearing sensor 22 outputs a signal having an amplitude corresponding to the distance to the impeller 31, the tuning circuit 112 takes out the detection signal in synchronization with the signal, and the amplifier 113 amplifies the detection signal. And applied to the magnetic bearing control circuit 121. The magnetic bearing control circuit 121 performs PID control based on the detection signal and gives the control output to the magnetic bearing PWM circuit 122. The magnetic bearing PWM circuit 122 varies the pulse width of the given control signal by PWM (pulse width modulation), the magnetic bearing gate drive circuit 123 gates the PWM signal, and the magnetic bearing power amplifier 124 electromagnets based on the PWM signal. 21 is driven.
[0009]
On the other hand, the motor control circuit 131 gives a control signal based on the command inputted to the sequence circuit 101 to the motor PWM circuit 132, and the motor PWM circuit 132 gives the PWM control signal to the motor gate drive circuit 133, and the motor gate drive circuit 133 provides a drive signal to the motor power amplifier 104. The motor power amplifier 104 drives the motor stator 41 by the drive signal.
[0010]
[Problems to be solved by the invention]
In the blood pump apparatus shown in FIGS. 13 and 14, the characteristics of the magnetic bearing sensor 22 are slightly different for each rod of the blood pump. For this reason, it is necessary to make adjustments for each sensor in the sensor circuit 110. As a result, the controller 10 is not compatible with each blood pump body, and has become a bottleneck in mass production.
[0011]
Further, the magnetic bearing power amplifier 124, the motor power amplifier 104, and the like generate a large amount of heat due to switching loss, and the controller 10 also has heat, which may adversely affect when implanted in the body.
[0012]
Therefore, a main object of the present invention is to provide a blood pump device that can be compatible with a pump body and a controller and that can cool a heat generating portion with blood.
[0013]
[Means for Solving the Problems]
This invention includes a casing, an impeller driven floated to, a motor Ru drives the impeller, a sensor for detecting a floating position of the impeller, and a controlled magnetic bearing portion for supporting the impeller in a non-contact in the magnetic levitation type blood pump apparatus having, a position detecting circuit for determining the floating position of the impeller on the basis of the output of the sensor, a drive circuit for controlling the motor, control type magnetic bearing based on the output signal of the position detection circuit And a magnetic bearing control circuit for controlling the motor . The casing includes first to third chambers partitioned by first and second partition walls, and an inflow port for allowing blood flowing from outside the casing to flow into the second chamber through the first chamber. And a discharge port for discharging the blood flowing into the second chamber out of the casing. The impeller is provided in the second chamber, the motor is provided in the third chamber, and the sensor and the control type magnetic bearing portion are provided in the first chamber. The motor includes a columnar portion standing on the second partition wall, a rotor provided rotatably around the columnar portion, and a stator provided at the tip of the columnar portion. The position detection circuit is built in the casing, and at least one of the position detection circuit, the drive circuit, and the magnetic bearing control circuit is provided around the inlet in the first chamber or the cylindrical portion in the third chamber. And is cooled by blood flowing through the inlet or the second chamber .
[0014]
Therefore, it is possible to adjust the position detection circuit in accordance with the characteristics of Runode be built position detection circuit in the casing are built-in sensor, it is possible to maintain the compatibility of the controller. Moreover, if a drive circuit or a magnetic bearing control circuit is built in the casing, the heat generated from these can be cooled by the flowing blood.
[0015]
Preferably, it includes an AC / DC converting means for converting an AC voltage into a DC voltage, and a DC / DC converting means for converting the converted DC voltage into a different DC voltage, the DC / DC converting means being in the first room. It is provided around the inflow port or at the tip of the cylindrical portion in the third chamber, and is cooled by blood flowing through the inflow port or the second chamber . Also in this case, the heat generated by the direct current / direct current conversion means can be cooled by blood.
[0016]
More preferably, the position detection circuit includes a carrier wave generation circuit that generates a carrier wave, and a tuning circuit that detects a tuning signal of a sensor that is tuned to the carrier wave from the carrier wave generation circuit to detect the flying position of the impeller, The carrier wave generation circuit and the tuning circuit are provided around the inlet of the first chamber or at the tip of the cylindrical portion of the third chamber, and are cooled by blood flowing in the inlet or the second chamber. . Heat generated in the tuning circuit and the carrier wave generating circuit in the case of this the possible cooling with blood. Further , by adjusting the carrier wave generation circuit and the tuning circuit in accordance with the characteristics of the sensor, compatibility with the controller can be achieved.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram showing a first embodiment of the present invention. In this embodiment, the sensor circuit 110 is housed in a pump body 1a. Then, a DC voltage is supplied from the controller 10 a to the sensor circuit 110 via the connector 50. Further, the output of the sensor circuit 110 is given to the magnetic bearing control circuit 121 via the connector 50. The sensor circuit 110 includes a carrier wave generation circuit 111, a tuning circuit 112, and an amplifier 113 in the same manner as in FIG.
[0018]
On the other hand, the controller 10a monitors the operation status of the sequence circuit 101 to which a control signal such as a rotation command or a levitation command is applied from the outside, the AC / DC converter 102 to which AC power is applied, and the blood pump. And a monitor circuit 103 that performs communication. Further, the controller 10 a also includes a motor power amplifier 104, a magnetic bearing power amplifier 124, and a DC / DC converter 105 to which a DC power is supplied from the AC / DC converter 102. The controller 10a includes a magnetic bearing PWM circuit 122, a magnetic bearing gate drive circuit 123, a motor control circuit 131, a motor PWM circuit 132, and a motor gate drive circuit 133. Since the operation and connection of these circuits are the same as those described above with reference to FIG. 14, the description thereof is omitted here.
[0019]
Also, as will be described later with reference to FIGS. 10 to 12, the structure, mounting position, and the like are different, so the magnetic bearing sensor is 24, the electromagnet is 23, the motor stator is 67, and the signs are different from those in FIGS. The basic functions are the same.
[0020]
In the embodiment shown in FIG. 1, by incorporating the sensor circuit 110 in the pump body 1a, the sensor circuit 110 can be adjusted in accordance with the magnetic bearing sensor 24, and compatibility with the controller 10a is provided. be able to.
[0021]
In the second to ninth embodiments described below, the circuits denoted by the same reference numerals shown in FIG. 14 are the same in operation and connection, and will be omitted to avoid redundant description. Only the circuits built in the pump bodies 1b to 1i will be described, and the description of other circuits built in the controllers 10b to 10i will be omitted.
[0022]
FIG. 2 is a diagram showing a second embodiment of the present invention. In this embodiment, the magnetic bearing power amplifier 124 and the motor power amplifier 104, which generate significant heat due to switching loss, are built in the pump body 1b. Also in this example, a DC voltage is supplied from the AC / DC converter 102 in the controller 10 b to the magnetic bearing power amplifier 124 and the motor power amplifier 104 via the connector 50.
[0023]
In this embodiment, the magnetic bearing power amplifier 124 and the motor power amplifier 104 are built in the pump body 1b, and the heat from the magnetic bearing power amplifier 124 and the motor power amplifier 104 is cooled by the blood fed by the pump body 1b. And the heat generation of the controller 10b can be suppressed.
[0024]
In the embodiment shown in FIG. 2, not only the magnetic bearing power amplifier 124 and the motor power amplifier 104 but also the sensor circuit 110 as shown in FIG. 1 may be incorporated in the pump body 1b. In this case, there is an advantage that not only the heat generation of the controller 10b can be suppressed, but also compatibility between the pump body 1b and the controller 10b can be provided.
[0025]
FIG. 3 is a block diagram of a third embodiment of the present invention. In this embodiment, a sensor circuit 110, a motor control circuit 131, a motor PWM circuit 132, a motor gate drive circuit 133, and a motor power amplifier 104 are built in a pump body 1c. The controller 10c is provided with other configurations.
[0026]
In this embodiment, the sensor circuit 110 is built in the pump body 1c so as to be compatible with the controller 10c, and only the motor-related configuration is built in to prevent the shape of the pump body 1c from becoming large. Is.
[0027]
FIG. 4 is a block diagram showing a fourth embodiment of the present invention. In this embodiment, a magnetic bearing PWM circuit 122, a magnetic bearing gate drive circuit 123, and a magnetic bearing power amplifier 124 for controlling the electromagnet 23 in the pump body 1d (hereinafter, these three circuits are referred to as a drive system of the electromagnet 23). And a motor PWM circuit 132 for controlling the motor stator 41, a motor gate drive circuit 133, and a motor power amplifier 104 (hereinafter, these three circuits are referred to as a drive system for the motor stator 67). It is.
[0028]
In this embodiment, circuit portions that handle switching signals, such as the magnetic bearing PWM circuit 122 and the motor PWM circuit 132, are built in the pump body 1d, thereby reducing the distance between the electromagnet 23 and the motor stator 67 and their drive systems. As a result, it is possible to reduce the occurrence of dullness or distortion of the control signal. When the control signal is dull or distorted, heat is generated. In this embodiment, such heat generation can be suppressed. The controller 10d includes a sensor circuit 110, a magnetic bearing control circuit 121, a motor control circuit 131, and the like.
[0029]
FIG. 5 is a block diagram showing a fifth embodiment of the present invention. This embodiment is a combination of the embodiment shown in FIG. 4 and the embodiment shown in FIG. 1, and not only the drive system of the electromagnet 23 and the drive system of the motor stator 67 but also the sensor circuit 110 includes the pump body 1e. It is possible to bring together the effects of the embodiments of FIGS. 1 and 4.
[0030]
FIG. 6 is a block diagram showing a sixth embodiment of the present invention. In this embodiment, the drive system of the sensor circuit 110 and the electromagnet 23 is preferentially built in the pump body 1f.
[0031]
FIG. 7 is a block diagram showing a seventh embodiment of the present invention. In this embodiment, the pump body 1g incorporates the sensor circuit 110, the drive system for the electromagnet 23 and the drive system to the motor stator 67 in the pump body 1g, and the other power supply circuit, sequence circuit, and monitor circuit are incorporated in the controller 10g. Is.
[0032]
FIG. 8 is a block diagram showing an eighth embodiment of the present invention. In the pump body 1h, only the AD / DC converter 102 and the DC / DC converter 105 are built in the controller 10h, and the other sequence circuit 101 and monitor circuit. 103, the sensor circuit 110, the drive system of the electromagnet 23, and the drive system of the motor stator 67 are all built in the pump body 1h.
[0033]
FIG. 9 is a block diagram showing a ninth embodiment of the present invention. In this embodiment, only the AC / DC converter 102 is built in the controller 10i, and all other components are built in the pump body 1i.
[0034]
In each of the embodiments shown in FIGS. 6 to 9, the pump body is enlarged by incorporating the drive system in the pump body. However, the heat dissipation effect can be improved, and the compatibility between the pump body and the controller is improved. There is an advantage that it can have.
[0035]
Figure 10 is a diagram showing an example of a blood pump body to which the present invention is applied, and corresponds to 1A～1 i in FIGS. 1-9. 10A shows a longitudinal sectional view, FIG. 10B is a sectional view taken along line AA in FIG. 10A, and FIG. 11 shows a line BB in FIG. 10A. 12 is a cross-sectional view taken along line CC in FIG. 10A.
[0036]
10, in the blood pump main body, the casing 1 is partitioned by partition walls 11, 12, 13, and 14, and a magnetic bearing portion 20, a pump portion 30, and a motor portion 60 are provided in each area. The casing 1 is made of plastic, ceramic, metal or the like, and the partition wall 12 between the electromagnet portion 20 and the pump portion 30 and the partition wall 14 between the pump portion 30 and the motor portion 60 in the casing 1 are magnetic materials. Since it cannot be used, it is made of a nonmagnetic material.
[0037]
A pump chamber 33 is provided in the casing 1 of the pump unit 30, and the impeller 31 rotates in the pump chamber 33 to discharge the fluid from the discharge port 16 (see FIG. 10B). The impeller 31 has a plurality of blades 34, and the blades 34 are formed in a spiral shape as shown in FIG. The impeller 31 includes a nonmagnetic member 35 having a permanent magnet 32 constituting a non-control type magnetic bearing, and a soft magnetic member 36 corresponding to a rotor of the control type magnetic bearing. The permanent magnet 32 is divided in the circumferential direction of the impeller 31, and magnets adjacent to each other are magnetized by magnetic poles in opposite directions.
[0038]
In addition, by coating heparin which is an anticoagulant in the entire pump chamber 33, thrombus formation at these portions can be prevented, and the pump chamber 33 can be used as a blood transport pump. In this case, the heparing coating brings effects such as coagulation activation inhibition, platelet protection, activation inhibition, inflammatory activity inhibition, fibrinolytic activation inhibition, and infection inhibition.
[0039]
In FIG. 10, the speckled portion of the impeller 31 indicates a soft magnetic material, and the other portions indicate a nonmagnetic material. When used in applications that transport corrosive fluids such as blood, the soft magnetic material is highly corrosion resistant ferritic stainless steel (SUS447J, SUS444, etc.), and the nonmagnetic material is high corrosion resistance austenitic stainless steel (SUS316L, etc.). Or a titanium alloy, pure titanium, or the like.
[0040]
A cylindrical portion 68 extending from the center of the partition wall 13 toward the partition wall 14 is formed in the motor unit 60 so as to face the side of the impeller 31 having the permanent magnet 32. A motor bearing 69 composed of a roller rolling bearing is provided on the outer peripheral surface of the cylindrical portion 68. A motor rotor 66 is rotatably supported by the motor bearing 69. A motor stator 67 is attached. The motor rotor 66 is driven by a motor stator 67 and rotates. The motor rotor 66 is provided with the same number of permanent magnets 65 as the impeller 31 so as to face the permanent magnets 32 of the impeller 31 and to exert an attractive force. The permanent magnets 65 are also magnetized adjacent to each other in opposite magnetic poles.
[0041]
As the motor, a synchronous motor including a DC brushless motor, an asynchronous motor including an induction motor, or the like is used, but the type of motor is not limited.
[0042]
The electromagnet unit 20 and the magnetic bearing sensor 24 are attached to the electromagnet unit 20 on the inner wall of the partition wall 12 that partitions the electromagnet unit 20 and the pump unit 30 so as to face the side having the soft magnetic member 36 of the impeller 31. . The impeller 31 can be held in the center of the pump chamber 33 by the electromagnet 23 and the magnetic bearing sensor 24 in balance with the attractive force of the permanent magnets 32 and 45 in the pump chamber 33.
[0043]
With this configuration, the heat generated by the electromagnet 23 can be transmitted to the partition wall 12 and cooled by the liquid in the pump unit 30. Similarly, heat generated in the motor stator 67 is also transmitted from the cylindrical portion 68 to the partition wall 13 and cooled by the liquid in the motor portion 30. As a result, heat transfer to the outside of the casing 1 can be reduced. In addition, heat transmitted to the magnetic bearing sensor 24 can be reduced, and sensing can be stabilized. Further, if the thicknesses of the partition walls 12 and 13 are increased to some extent to give the strength enough to attach the electromagnet 23, the magnetic bearing sensor 24, and the motor stator 67, the thickness of the outer diameter portion of the housing 1 can be reduced. .
[0044]
The electromagnet 23 and the magnetic bearing sensor 24 are arranged as shown in FIGS. That is, the sensor 241 is disposed between the magnetic poles 51 and 52 of the electromagnets 23 that form a pair, the sensor 242 is disposed between the magnetic poles 53 and 54, and the sensor 243 is disposed between the magnetic poles 55 and 56. Is arranged. As these sensors 241 to 243, magnetic sensors such as eddy current sensors and reluctance sensors are generally used.
[0045]
Furthermore, as shown in FIG. 12, the yokes 71 to 76 of each electromagnet 23 are formed in a cylindrical shape, and electromagnet coils 81 to 86 are wound around the electromagnet yokes 71 to 76, respectively.
[0046]
Thus, by arranging the magnetic poles 51 to 56 in the circumferential direction, the storage space for the electromagnetic coils 81 to 86 that can be stored in the magnetic bearing portion 40 can be increased, and the coil winding space can be increased without increasing the pump size. Can be secured widely. By expanding the coil storage space in this way, it is possible to increase the number of turns of the electromagnet coil and increase the wire diameter of the coil. As a result, power saving of the electromagnet can be achieved.
[0047]
Further, by making the shape of the electromagnet yokes 71 to 76 cylindrical, the winding operation of the electromagnet coils 81 to 86 around the electromagnet yokes 71 to 76 is facilitated. Furthermore, since the shapes of the electromagnet yokes 71 to 76 are simple, insulation from the electromagnet coils 81 to 86 is ensured. Although the electromagnet yokes 71 to 76 are cylindrical, this may be a prism, which facilitates the coil winding operation, and as a result, it is easy to ensure the insulation withstand voltage between the coil and the yoke. .
[0048]
Further, in FIG. 11 and FIG. 12, all the electromagnetic yokes 71 to 76 and the electromagnetic coils 81 to 86 are arranged on the same circumference, but in order to effectively secure a storage space, each of the electromagnetic yokes 71 to 76 and The electromagnet coils 81 to 86 may not be on the same circumference.
[0049]
By arranging the magnetic poles and yokes of each electromagnet of the magnetic bearing in the circumferential direction, it becomes possible to increase the space of the magnetic bearing portion, that is, to further change the yoke of the electromagnet to a cylinder or a prism, and to wind the coil. The work is facilitated, and as a result, the withstand voltage between the coil and the yoke is easily secured.
[0050]
The circuits housed in the pump main bodies 1a to 1i in each of the above-described embodiments shown in FIGS. 1 to 9 are the empty space on the back side of the motor stator 67 shown in FIG. Etc.). In particular, if attached to the periphery of the inlet 15, the heat can be efficiently cooled by the blood flowing through the inlet 15, and if attached to the back side of the motor stator 67, the heat radiation effect from the cylindrical portion 68 through the partition wall 13. Can be obtained.
[0051]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
[0052]
【The invention's effect】
As described above, according to the present invention, if the casing includes a position detection circuit that determines the flying position of the impeller based on the output of the sensor, the position detection circuit can be adjusted according to the characteristics of the blood pump body sensor. And compatibility with the controller can be maintained.
[0053]
Also, if either the drive circuit for controlling the drive means or the magnetic bearing control circuit for controlling the control type magnetic bearing portion is built in the casing, the heat generated from the drive circuit can be efficiently cooled by the fluid, and the controller Heat generated from the main body can be reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a first embodiment of the present invention.
FIG. 2 is a block diagram showing a second embodiment of the present invention.
FIG. 3 is a block diagram showing a third embodiment of the present invention.
FIG. 4 is a block diagram showing a fourth embodiment of the present invention.
FIG. 5 is a block diagram showing a fifth embodiment of the present invention.
FIG. 6 is a block diagram showing a sixth embodiment of the present invention.
FIG. 7 is a block diagram showing a seventh embodiment of the present invention.
FIG. 8 is a block diagram showing an eighth embodiment of the present invention.
FIG. 9 is a block diagram showing a ninth embodiment of the present invention.
FIG. 10 is a view showing a blood pump body to which the present invention is applied.
11 is a cross-sectional view taken along line BB shown in FIG.
12 is a cross-sectional view taken along the line CC shown in FIG.
FIG. 13 is a longitudinal sectional view of a conventional blood pump main body.
FIG. 14 is a block diagram of a conventional pump body and controller.
[Explanation of symbols]
1,1a to 1i pump body, 21,23 electromagnet, 22,24 magnetic bearing sensor, 41,67 motor stator, 50,150 connector, 10,10a-10i controller, 101 sequence circuit, 102 AC / DC converter, 103 monitor Circuit, 104 motor power amplifier, 105 DC / DC converter, 110 sensor circuit, 111 carrier wave generation circuit, 112 tuning circuit, 113 amplifier, 121 magnetic bearing control circuit, 122 magnetic bearing PWM circuit, 123 magnetic bearing gate drive circuit, 124 magnetic Bearing power amplifier, 131 motor control circuit, 132 motor PWM circuit, 133 motor gate drive circuit.

Claims (3)

A casing, an impeller driven floated to, a motor Ru by driving the impeller, a sensor for detecting the floating position of the impeller, and a controlled magnetic bearing portion for supporting the front Symbol impeller in a non-contact in the magnetic levitation type blood pump having,
A position detection circuit for determining the flying position of the impeller based on the output of the sensor, a drive circuit for controlling the motor, and a magnetic bearing control for controlling the control type magnetic bearing based on an output signal of the position detection circuit With circuit ,
The casing penetrates the first to third chambers partitioned by the first and second partition walls and the first chamber, and allows blood flowing from outside the casing to flow into the second chamber. And an outlet for discharging the blood flowing into the second chamber out of the casing,
The impeller is provided in the second chamber, the motor is provided in the third chamber, the sensor and the control type magnetic bearing portion are provided in the first chamber,
The motor includes a columnar portion erected on the second partition wall, a rotor provided rotatably around the columnar portion, and a stator provided at a tip portion of the columnar portion,
The position detection circuit is built in the casing,
At least one of the position detection circuit, the drive circuit, and the magnetic bearing control circuit is provided around the inflow port in the first chamber or the tip of the cylindrical portion in the third chamber. A blood pump device, wherein the blood pump device is cooled by blood flowing through the inlet or the second chamber . And AC / DC converting means for converting AC voltage to DC voltage;
DC / DC converting means for converting the converted DC voltage into a different DC voltage,
The direct current / direct current conversion means is provided around the inlet in the first chamber or at the tip of the cylindrical portion in the third chamber, and is cooled by blood flowing in the inlet or the second chamber. The blood pump device according to claim 1, wherein The position detection circuit includes:
A carrier wave generating circuit for generating a carrier wave;
A tuning circuit that detects a tuning signal of a sensor that is tuned to a carrier wave from the carrier wave generation circuit to detect a flying position of the impeller;
The carrier wave generation circuit and the tuning circuit are provided around the inflow port in the first chamber or at the tip of the cylindrical portion in the third chamber, and by blood flowing through the inflow port or the second chamber The blood pump device according to claim 1, wherein the blood pump device is cooled .

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