JP3236324B2 - Centrifugal pump drive for artificial lung - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates relates to a centrifugal pump drive <br/> equipment for artificial lungs, a liquid channel containing more other medical devices and centrifuge artificial lung pump Specifically, the bubbles centrifugal pump drive equipment for artificial lung for driving the pump in order to remove
About the.

[0002]

2. Description of the Related Art In general, when a medical device such as an artificial lung is connected to a medical pump and auxiliary circulation is performed, priming for removing bubbles by filling a blood flow path with a Ringer's solution or the like before the auxiliary circulation is performed. Operation is required. In particular, in the blood flow path of the extracorporeal circulation circuit of an artificial lung, since there are many complicated and narrow flow paths such as hollow fiber membranes, tubes, and connectors, it is necessary to remove air bubbles and the like attached to these flow paths. This is a very important task.

In the priming operation, a conventional method removes air bubbles by applying vibration to a blood flow path while driving a pump at a constant speed.

[0004]

However, such a conventional priming method requires a considerable amount of skill and a long time, and therefore requires an operator for long periods of time. Recently, EBS (Emergenc
y Bypath System), i.e., at the site of the affected patient, the procedure of blood removal from the patient's femoral artery, passing through a pump and oxygenator, and then returning blood from the femoral artery to perform assisted circulation is an emergency procedure. Therefore, it is necessary to set up the extracorporeal circulation circuit of the oxygenator as soon as possible. Therefore, the conventional complicated and long priming operation has been a major obstacle.

The present invention has been made in view of the above-mentioned problems, and has as its object the purpose of eliminating the need for complicated operations, and in a short period of time, in a liquid flow path comprising a centrifugal pump for an artificial lung, an artificial lung, and a tube. it is to provide a centrifugal pump driving equipment for artificial lung that can remove air bubbles.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a distal end for an artificial lung is provided.
Heart pump drive device by transferring liquid by a centrifugal pump, a bubble removing means for removing air bubbles from the liquid flow path including an artificial lung, a bubble detecting means, and a pump drive means for driving the centrifugal pump, the Intermittently drive the pump drive means
Setting means capable of arbitrarily setting various setting values in order, a set value storage means for storing the set value set by said <br/> setting means, when the bubble is detected by the bubble detecting means
And a intermittent drive control means for intermittently driving the said pump drive means based on set value stored in the setting value storing unit to remove bubbles.

[0007] With such a configuration , the remote control device for an artificial lung of the present invention is used.
According to the heart pump driving device, the centrifugal pump is intermittently driven by the pump driving device based on the various set values stored in the storage device. Therefore, air bubbles in the liquid flow path including the artificial lung can be automatically and efficiently removed in a short time.

The centrifugal pump driving apparatus for an artificial lung according to the present invention includes a bubble removing means for removing liquid bubbles from a liquid flow path including an artificial lung by transferring a liquid by a centrifugal pump .
And bubble detection means, pump drive means for driving the centrifugal pump, a constant-speed driving control means for driving the pump driving means at a constant speed and is intermittently driving said pump drive means
Setting means capable of arbitrarily setting various setting values in order, a set value storage means for storing the set value set by said setting means, the gas when the gas bubbles is detected by the bubble detecting means
And intermittent drive control means for intermittently driving the said pump drive means based on the stored set value for the setting value storing means to remove bubbles, the intermittent driving the first mode by the constant speed drive control means Mode switching means for switching between the second mode by the control means may be provided.

[0009] In this construction of the centrifugal pump drive system for artificial lungs, a first mode for constant speed drive centrifugal pump, since a second mode in which the intermittent driving can be arbitrarily set, centrifugal pump Intermittent drive for artificial lung
Bubbles in the liquid flow path can be automatically removed, and the constant speed drive can be easily selected when the operator determines that the intermittent drive is unnecessary.

Further, the centrifugal pump driving apparatus for an artificial lung according to the present invention may further include a priority setting means for treating the first mode with priority over the second mode.

[0011]

Further, the driving device for a centrifugal pump for an artificial lung according to the present invention may further comprise a display means for displaying the set value stored in the set value storage means.
With such a configuration, the operator can interactively change various setting values.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows an oxygenator according to an embodiment of the present invention.
1 shows a configuration of a priming system using a centrifugal pump driving device. This system includes an artificial lung 1 as a medical device having a liquid flow path.

The oxygenator 1 contains a bundle of a number of porous hollow fiber membranes in a housing, and has a blood inlet 11 at an upper part and a blood outlet 17 at a lower part. Between the blood outlet 17 and the inner wall surface of the housing and the outer surface of the porous hollow fiber membrane, a blood chamber serving as a liquid passage is formed.

When the artificial lung 1 is actually used in extracorporeal circulation, venous blood extracted from the human body receives blood from the blood inlet 1.
1 and comes into contact with the outer surface of the porous hollow fiber membrane disposed inside. On the other hand, an oxygen-containing gas is flowed into the porous hollow fiber membrane, oxygen is added to the blood through a large number of pores of the porous hollow fiber membrane, flows out of the blood outlet 17, and flows into the arteries of the human body. Is returned.

Here, the porous hollow fiber membrane of the oxygenator 1 has the property of allowing gas to pass but not liquid and forming part of a blood chamber as a liquid flow path. The artificial lung 1 itself also functions as a defoaming unit.

The blood inlet 11 of the oxygenator 1 is a tube 12
Outlet 1 of centrifugal pump 2 as a medical pump through
It is in communication with 3. The centrifugal pump 2 is configured such that a rotating body disposed inside is rotationally driven by a motor 4. The motor 4 and the rotating body are connected by coupling means such as magnetic coupling.

The motor 4 is driven by a motor driving device 5
Drive control is performed at constant speed rotation or intermittent rotation, whereby liquid transfer by the centrifugal pump 4 is performed at constant speed or intermittently.

On the upstream side of the centrifugal pump 2, a container 3 containing a liquid harmless to a living body such as Ringer's solution is provided. The container 3 is connected to the tube 1 via a branch pipe 15.
It is communicated in the middle of 6. One end of the tube 16 communicates with the inlet 14 of the centrifugal pump 2. Tube 16
Is connected to the blood outlet 17 of the artificial lung 1.

An air bubble detection sensor 6 is provided in the tube 12 on the downstream side of the centrifugal pump 2. The bubble detection sensor 6 is a sensor that detects the presence or absence of bubbles moving in the tube 12, and is configured by, for example, an ultrasonic sensor.

In the priming system of the present embodiment, the Ringer's solution in the container 3 flows into the tube 16 through the branch pipe 15, and further flows into the centrifugal pump 2 from the inflow port 14 through the tube 16. . The Ringer's solution that has flowed into the centrifugal pump 2 is urged by the rotational force of the centrifugal pump 2, discharged from the outlet 13, and sent to the blood inlet 11 of the oxygenator 1. At this time, air bubbles adhering to the centrifugal pump 2 or the tube 12 are sent to the blood inlet 11 together with the Ringer's solution. Blood inlet 1
The air bubbles flowing into the artificial lung 1 together with the Ringer's liquid are radiated from the blood chamber in the oxygenator 1 to the outside through many holes of the porous hollow fiber membrane. Ringer's solution was then added to the artificial lung 1
The blood flows out of the blood outlet 17 located below the tube 16 into the tube 16.

In the priming system of this embodiment, since the centrifugal pump 2 is intermittently driven by the pump driving device 5 as described later, a predetermined amount of Ringer's solution is supplied from the outlet 13 at a predetermined time interval. It is sent out intermittently. Since the Ringer's solution is intermittently transferred in this manner, bubbles attached to the inner surface of the liquid flow path such as the tube 12 are efficiently released from the inner surface of the flow path due to the strength of the flow of the Ringer's liquid. It is removed to the outside in the artificial lung 1.

FIG. 3 shows the structure of the operation panel 20 in the pump driving device 5. The operation panel 20 has a start key 2 for instructing normal constant speed driving.
1. Stop key 22 for stopping driving, priming key 23 for instructing intermittent driving, mode key 24 for switching to a setting mode for changing various setting values for intermittent driving, and increasing the setting value Various keys such as an up key 25 and a down key 26 for decreasing a set value are provided.

When the priming key 23 is pressed twice, a priming signal release signal is output in the same manner as the stop key 22. Each time the mode key 24 is pressed, the change mode changes, and different types of set values such as voltage and drive time can be changed.

The operation panel 20 further displays a message display unit 27 for displaying various messages to the operator, a knob 28 for adjusting the number of revolutions of the centrifugal pump 2, and the number of revolutions. A rotation speed display section 29 and a liquid flow rate display section 30 for displaying the flow rate of a liquid such as Ringer's solution are provided. Note that the message display unit 27 is configured by a liquid crystal display (LCD).

FIG. 1 shows a main part of a circuit configuration of a control unit of the pump driving device 5.

The pump driving device 5 has a CPU (central processing unit) 40. The CPU 40 is connected to each unit of the apparatus via a bus 41 such as a data bus. The ROM (Read Only Memory) 42 is a memory that stores programs for performing various controls of the pump driving device 5. A RAM (random access memory) 43 is a memory for temporarily storing various data required for controlling the pump driving device 5.

EEPROM (Electrically Erasable Programmable Read Only Memory) 44
Are a priming high voltage (for example, 8 V) for intermittently driving the centrifugal pump 2, a priming low voltage (for example, 1 V), a driving time at the priming high voltage (for example, 2 seconds), and a driving time at the priming low voltage (for example, 1). This is a non-volatile memory that can be selectively changed partially for storing various set values such as one second) and one cycle of intermittent driving (for example, three seconds).

The CPU 40 also has a message display unit 2
7 is connected, and various messages during pump driving are displayed in an interactive manner. Furthermore, CPU
A keyboard interface circuit 45 is connected to 40. This keyboard interface circuit 45
Is a switch circuit 4 comprising the various keys 21 to 26 described above.
Among the various signals output from the start key 21
Signal b and stop key 22 output from
Signals other than the stop signal c output from the CPU 40
To be sent to

The CPU 40 receives the signal output from the priming key 23 and outputs a priming signal a. In response to the signal output from the mode key 24, the CPU 40 sets the mode to the set value for the intermittent driving stored in the EEPROM 44. Is set to a set value change mode in which can be changed. In the setting value change mode, the CPU
Numeral 40 changes the set value every time the up key 25 or the down key 26 is turned on.

The priming signal a output from the CPU 40 is supplied to one input terminal of an OR circuit 49 and one input terminal of a multiplexer 47, respectively. A start signal b or a stop signal c output from the keyboard interface circuit 45 is supplied to the other input terminal of the OR circuit 49 and the other input terminal of the multiplexer 47, respectively.

The OR circuit 49 supplies the priming signal a input from the CPU 40 or the start signal b (or stop signal c) output from the keyboard interface circuit 45 to the motor drive circuit 50. The motor drive circuit 50 receives these signals and controls the drive of the motor 4. That is, when the priming signal a is input, the motor 4 is intermittently driven, while when the start signal b is input, the motor 4 is driven at a constant speed. When the stop signal c is input, the drive of the motor 4 is stopped.

The multiplexer 47 selects either the input priming signal a or the start signal b (or the stop signal c), and outputs a switching signal d to the analog switch 48 based on the selected signal. I have.

The analog switch 48 receives the switching signal d
The movable contact 48c is switched to either the fixed contact 48a or the fixed contact 48b in accordance with the contents of the above. That is, when the priming signal a is selected by the multiplexer 47, the movable contact 48c is switched to the fixed contact 48a as shown by a broken line in the figure, and the start signal b (or the stop signal c) is selected by the multiplexer 47. In this case, the movable contact 48c is switched to the fixed contact 48b as shown by a solid line in the figure. The movable contact 48c of the analog switch 48 is connected to the motor drive circuit 50.

Fixed contact 48b of analog switch 48
Is connected to the slider 53a of the variable resistor 53 for adjusting the number of revolutions connected to the motor drive circuit 50. When the movable contact 48c is switched to the fixed contact 48b, the motor drive circuit 50 drives the motor 14 at a constant speed based on the voltage value set by the variable resistor 53, that is, the set rotation speed. ing. This voltage value is adjusted by the rotation speed adjusting knob 28 shown in FIG.

One fixed contact 4 of the analog switch 48
8a is connected to the CPU 40 via a D / A converter (analog / digital converter) 51. CP
When the priming key 23 is turned on, U40
The priming signal a is output and the EEPROM
A set value for intermittent driving such as a voltage value stored in advance from 44 is read out, and the set value data e is output to the D / A converter 51. The D / A converter 51 converts the set value data (digital signal) e output from the CPU 40 into an analog signal, and then supplies the analog signal to the fixed contact 48 a of the analog switch 48.

The set value data e supplied to the fixed contact 48a is supplied to the motor drive circuit 50 via the movable contact 48c. The motor drive circuit 50 outputs the set value data e
, The motor 14 is driven intermittently.

FIG. 4 shows an example of a pulse waveform of the motor drive voltage. When priming key 23 is turned on, the priming high voltage is supplied for _one second T, then priming low voltage is supplied T ₂ seconds.

Returning to FIG. 1, the description will be continued. A motor rotation detection sensor (not shown) composed of, for example, a Hall element is provided inside the motor 4, and a rotation detection pulse from this sensor is supplied to a counter 52 through a motor drive circuit 50. . The counter 52 counts the number of supplied pulses and sends it to the CPU 40. The CPU 40 calculates the number of rotations of the motor 4 based on the number of pulses, and displays the number on the number-of-rotations display unit 29 shown in FIG.

The CPU 40 further includes an air bubble detection circuit 55
The bubble detection sensor 6 is connected via the. The bubble detection circuit 55 sends a bubble detection signal e output from the bubble detection sensor 6 to the CPU 40. CPU4
When the bubble detection signal e is not input within a predetermined time by a built-in timer, the value 0 is determined as not requiring the priming operation, and the output of the priming signal a is stopped (turned off).

Next, the medical pump driving device 5 of this embodiment
Will be described in detail with reference to flowcharts of FIGS.

First, when the power is turned on (step S100: Y), the CPU 40 performs initialization processing of each unit (step S101), and then causes the message display unit 20 to perform ready display (step S102).

Next, the CPU 40 determines which of the start key 21 and the priming key 23 has been turned on. When the start key 21 is turned on (step S103: Y), the CPU 40 outputs the start signal b to the motor drive circuit 50 via the OR circuit 49, and outputs the switching signal d to the analog switch 48 via the multiplexer 47. And the movable contact 48c of the analog switch 48 is connected to the fixed contact 48b. As a result, the motor drive circuit 48 starts the constant speed drive of the motor 4 with the rotation speed based on the voltage value preset by the variable resistor 53 (step S104).

Thereafter, the stop key 2 is operated by the operator.
If 2 is turned on (step S105: Y), the driving of the motor 4 is stopped (step S106), and thereafter, the process returns to step 102.

On the other hand, when the start key 21 is not turned on and the priming key 23 is turned on (step S10)
At 3: N), the CPU 40 turns on the priming signal a (step S108), and outputs this to the motor drive circuit 50 via the OR circuit 49 and to the multiplexer 47. The multiplexer 47 receives this signal and outputs a switching signal d to the analog switch 48 to switch the movable contact 48c of the analog switch 48 to the fixed contact 48a. Thereby, the motor drive circuit 50
Drives the motor 4 intermittently based on a preset value.

That is, the priming high voltage shown in FIG. 4 is output (step S109), and then the set time T
_{When 1} has elapsed (Step S110; Y), a priming low voltage is output (Step S111). And
Set time T ₂ has elapsed: (step S112 Y),
It returns to step S108. Among the set time T ₂ has not elapsed: (step S112 N), when the start key 21 is turned on; (step S113 Y) is, CPU 4
0 means that the steady operation is prioritized, and after turning off the priming signal (step S114), step 104 is executed.
Then, the above-mentioned steady driving is executed.

If the start key 21 has not been turned on in step S113 (N), the CPU 40 determines whether the priming key 23 has been turned on again or the stop key 22 has been turned on (FIG. 6, step S115), when any key is turned on (Y)
Turn off the priming signal (step S11).
6) After the intermittent driving is stopped, the process returns to step S102.

On the other hand, when all the keys remain off (step S115: N), the CPU 40 determines whether or not the bubble detection signal d from the bubble detection sensor 4 is detected within a predetermined time (step S115). Step S117). If the bubble detection signal e has not been detected for a certain period of time (Y), the priming signal is turned off (step S116), and the process returns to step S102. If the bubble detection signal f has been detected for a certain period of time (N), the flow returns to step S112 in FIG.

Returning again to step S110 in FIG.
If the start key 21 is turned on before the set time T ₁ has elapsed (step S118: Y), the CPU 40
Turns off the priming signal a (step S114),
After stopping the intermittent drive, the process proceeds to step S104,
Start steady operation.

[0051] Further, CPU 40 in step S110, before the elapse of the set time T ₁ (N), without the start key 21 is turned on (step S118:
N), when the priming key 23 is turned on again or the stop key 22 is turned on (FIG. 7, step S
In step 119: Y), the priming signal is turned off (step S120), and the intermittent driving is stopped. Then, the process returns to step S102 in FIG. Further, when all the keys remain off (step S119: N), the CPU 4
In step S121, it is determined whether the bubble detection signal f from the bubble detection sensor 4 has been detected for a certain period of time (step S121). If the bubble detection signal f has not been detected for a certain period of time (Y),
The priming signal is turned off (step S120), and the process returns to step S102. If the bubble detection signal e has been detected for a certain period of time (N), step S1 in FIG.
Return to 10.

Next, the operation when the mode key 24 is turned on and the operator changes various set values for intermittent driving will be described with reference to FIGS.

A state where neither the start key 21 nor the priming key 23 is turned on (step S107:
In (N), when the mode key 24 is turned on (step S122: Y), the CPU 40 causes the message display unit 27 to display the priming high voltage (step S12).
3).

Thereafter, the CPU 40 determines whether or not the mode key 24 has been turned on again (step S124).
If the mode key 24 is not turned on (N), it is determined whether the up key 25 or the down key 26 is turned on (step S125). When the up key 25 is turned on, the priming high voltage value is increased according to the number of times, and when the down key 26 is turned on, the priming high voltage value is decreased according to the number of times (step). S126) After that, return to step S123,
The message display part 2 displays the changed priming high voltage.
7 is displayed.

In step S124, the mode key 24
Is turned on again (Y), the CPU 40 stores the first or changed priming high voltage value in the EEP.
It is stored in the ROM 44 (step S127). Subsequently, the CPU 40 sets the driving time T _{1 of the} priming high voltage.
Is displayed on the message display unit 27 (step S1).
28) It is again determined whether or not the mode key 24 has been turned on by the operator (step S129).

When the mode key 24 is not turned on (N)
In step S13, the CPU 40 determines whether the up key 25 or the down key 26 has been turned on.
0). When the up key 25 is turned on, the drive time T ₁ is increased according to the number of times, and the down key 26 is turned on.
There after when it is turned decreased the drive time T ₁ in accordance with the number of times (step S131), step S128
To return, message display the changed driving time T ₂ 2
7 is displayed.

In step S129, the mode key 24
Is turned on again (Y), the CPU 40 stores the first or changed drive time T ₁ in the EEPROM 44.
(Step S132).

Subsequently, the CPU 40 displays the priming low voltage value on the message display section 27 (step S1).
33) It is again determined whether or not the mode key 24 has been turned on by the operator (step S134).

When the mode key 24 is not turned on (N)
In step S13, the CPU 40 determines whether the up key 25 or the down key 26 is turned on.
5). When the up key 25 is turned on, the priming low voltage value is increased according to the number of times, and when the down key 26 is turned on, the priming low voltage value is decreased according to the number of times (step). S136)
Thereafter, the process returns to step S133, and the changed priming low voltage is displayed on the message display unit 27.

In step S134, the mode key 24
Is turned on again (Y), the CU 40 returns to the first,
Alternatively, the changed priming low voltage is
44 (step S137). After that, CP
U40 To display the drive time T ₂ of the priming low voltage on the message display unit 27 (step S13
8).

Subsequently, the CPU 40 determines whether or not the mode key 24 has been turned on again (step S139).
If the mode key 24 is not turned on (N), it is determined whether the up key 25 or the down key 26 has been turned on (step S140). If the up key 25 is turned on, increases the drive voltage T ₂ value according to the count. When the down key 26 is turned on, the drive voltage value T ₂ is decreased according to the number of times (step S141), and then the process returns to step S138, and the changed drive voltage value T ₂ is displayed on the message display unit 27. To be displayed.

In step S139, the mode key 24
Is turned on again (Y), the CPU 40 stores the first or changed drive voltage value T ₂ in the EEPROM 4.
4 (step S142). Then the CPU
40 returns to step S102 of FIG.

As described above, according to the pump driving device 5 of the present embodiment, the centrifugal pump 2 can be driven intermittently, whereby the air bubbles in the tube 12 and the oxygenator 1 can be efficiently removed. it can. In addition, since the operation of removing bubbles is automatically performed, the operation by the operator is not required during the operation. Therefore, during this time, the operator can perform other operations, and emergency response is facilitated.

The set values such as the voltage for the intermittent drive are displayed on the message display unit 27, and the set values are
Mode key 24, up key 25 and down key 26
Can be changed in an interactive manner with the message display unit 27, so that the operation by the operator becomes extremely easy.

The present invention has been described with reference to the examples.
The present invention is not limited to the above embodiments, and can be variously modified without changing the gist of the invention. For example, in the above embodiment, the up key 25 or the down key 2
6, the setting value is changed, but the setting value may be changed by the ten keys.

In the above embodiment, the changed set value is stored in the EEPROM 44. However, the changed set value may be stored in the ROM 43 as a backup.

In the above embodiment, when the set value change mode is set by the mode key 24, the set value can be changed by easily pressing the up key 25 or the like. The mode key 24 may be provided inside the apparatus so that the set value is not easily changed, or the apparatus is configured so that the set value change mode is not set unless the power of the apparatus is turned on while pressing a specific key. You may.

In the above-described embodiment, the start signal output from the start key 21 and the stop signal output from the stop key 22 are output to the CPU for safety.
The signal is sent directly to the motor drive circuit 50 without being sent to the CPU 40. However, if the safety does not matter so much, these signals are sent to the CPU 40 like other signals, and
The motor drive circuit 50 is used as a control signal from the CPU 40.
It may be configured to output to

[0069]

Artificial claim 1, wherein As described above, according to the present invention
According to the lung centrifugal pump drive device, the liquid is
Transfer the body to remove air bubbles from the liquid flow path including the oxygenator.
Bubble removing means for removing, bubble detecting means, and the centrifugal pump.
A pump drive means for driving the flop, the pump drive means
Setting means capable of arbitrarily setting various setting values in order to intermittently drive, a setting value storing means for storing the set value set by said setting means, air bubbles are tested by the bubble detecting means
Since a configuration and a intermittent drive control means for intermittently driving the said pump drive means based on the stored set values in the setting value storage unit in order to remove bubbles when issued, including oxygenator There is an effect that bubbles in the liquid flow path can be automatically and efficiently removed in a short time.

Further, according to the centrifugal pump driving device for an artificial lung, the liquid is transferred by the centrifugal pump to remove the air bubbles from the liquid flow path including the artificial lung, and the air bubble detecting means. Means, a pump driving means for driving the centrifugal pump, a constant speed driving control means for driving the pump driving means at a constant speed, and various setting values for intermittently driving the pump driving means. Setting means, setting value storage means for storing a set value set by the setting means, and setting stored in the set value storage means for removing the bubbles when the bubbles are detected by the bubble detecting means Intermittent drive control means for intermittently driving the pump drive means based on the value, and switching between a first mode by the constant speed drive control means and a second mode by the intermittent drive control means The first mode in which the centrifugal pump is driven at a constant speed and the second mode in which the centrifugal pump is driven intermittently can be arbitrarily set. While automatically removing bubbles in the liquid flow path including the lungs,
When the operator determines that the intermittent drive is not necessary, the constant speed drive can be easily selected.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a circuit configuration of a control unit of a medical pump driving device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a priming system using the pump driving device of FIG.

FIG. 3 is a front view illustrating a configuration of an operation panel in the pump driving device in FIG.

FIG. 4 is a waveform diagram illustrating an example of a motor drive voltage used in the pump drive device of FIG.

FIG. 5 is a flowchart for explaining a control operation of the pump driving device of FIG. 1;

FIG. 6 is a flowchart for explaining a control operation of the pump driving device in FIG. 1;

FIG. 7 is a flowchart for explaining a control operation of the pump driving device of FIG. 1;

FIG. 8 is a flowchart for explaining a control operation of the pump driving device of FIG. 1;

FIG. 9 is a flowchart for explaining a control operation of the pump driving device of FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 artificial lung 2 centrifugal pump 3 container 4 motor 5 pump driving device 6 bubble detection sensor 20 operation panel 21 start key 22 stop key 23 priming key 24 mode key 25 up key 26 down key 27 message display unit 40 CPU (central processing unit) 42 ROM 43 RAM 44 EEPROM 50 Motor drive circuit

Claims (2)

(57) [Claims] A centrifugal pump for transferring liquid to remove air bubbles from a liquid flow path including an artificial lung; an air bubble detecting means; a pump driving means for driving the centrifugal pump; Setting means for arbitrarily setting various setting values for intermittently driving the driving means; setting value storing means for storing the setting values set by the setting means; and when a bubble is detected by the bubble detecting means, An intermittent drive control means for intermittently driving the pump drive means based on the set value stored in the set value storage means for removing the air bubbles. . 2. A bubble removing means for transferring liquid by a centrifugal pump to remove bubbles from a liquid flow path including an artificial lung; a bubble detecting means; a pump driving means for driving the centrifugal pump; Constant-speed drive control means for driving the driving means at a constant speed; setting means for arbitrarily setting various set values for intermittently driving the pump driving means; and storing the set values set by the setting means. Set value storage means; and intermittent drive control for intermittently driving the pump drive means based on the set value stored in the set value storage means for removing bubbles when bubbles are detected by the bubble detection means. Means, and mode switching means for switching between a first mode by the constant speed drive control means and a second mode by the intermittent drive control means. Use centrifugal pump drive.