JPH11155945A - Blood pump driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a trouble attaching/detaching work by a method wherein one of an outlet port pair of a two-way switching valve, of which the inlet port is connected to a pressure altering source, is connected to an artificial heart, and the other is connected to a baloon pump through an isolator, and in addition, a control device is provided. SOLUTION: A compressor 2 which is a positive pressure source is selectively connected to an inlet port of a three-port two-way switching valve 9 through a pressure-regulating valve 3, a positive pressure reserver 4, and an electromagnetic valve 8 for positive pressure. A negative pressure pump 5 is also connected to the inlet port in the same manner, through a pressure-regulating valve 6, a negative pressure reserver 7, and a negative pressure electromagnetic valve 10. A first outlet port of a two-way switching valve 9 is connected to an artificial heart. A second outlet port is connected to a baloon pump 14 through an isolator 11, and an electromagnetic valve 13. A helium gas drawing/ discharging mechanism 15 is connected between the isolator 11 and the electromagnetic valve 13. Then, a switching control device 16 is provided. By this method, selective motions of the artificial heart 17 and the baloon pump 14 become possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blood pump driving device for assisting or acting on the heart to obtain normal blood pressure or blood flow.

[0002]

2. Description of the Related Art A blood pump is inserted into an aorta near a heart as disclosed in JP-A-3-30774 and JP-B-5-16870, and helium gas is inserted into the aorta in synchronization with the movement of the heart. Balloon pump (IA)
BP) and an artificial heart which assists the flow of blood with periodic pressure fluctuations from the outside as disclosed in Japanese Patent Publication No. 64-1148. When driving the balloon pump, the blood pump is operated by a driving device that uses, as a main component, an isolator in which a chamber communicating with the balloon pump and a chamber communicating with the positive pressure and the negative pressure pump are partitioned by a diaphragm.

[0003] A driving device for a balloon pump encloses helium gas in a circuit between the balloon pump and one chamber of the isolator, and air in a circuit between the positive pressure and the negative pressure pump and the other chamber of the isolator. And the diaphragm of the isolator is moved by air pressure to change the pressure of helium gas. The device for driving an artificial heart is substantially the same as the above-described configuration, but uses air instead of helium gas without using an isolator. Further, the pressure of the helium gas sent to the balloon pump is about 0.2 kgf / cm ² , while the pressure of the air sent to the artificial heart is about 0.5 kgf / cm ² .
Since it is rare to use a balloon pump and an artificial heart together in a medical setting, independent driving devices are provided for the balloon pump and the artificial heart.

[0004]

As described above, although the driving device of the balloon pump and the driving device of the artificial heart have basically the same configuration, the driving device dedicated to the balloon pump, It is uneconomical to prepare a dedicated drive for the heart, for example, removing the isolator and connecting the positive / negative pump directly to the artificial heart, or connecting the piping in one chamber of the isolator to a balloon pump or artificial heart. Attempts to connect and drive a balloon pump or artificial heart with helium gas have been attempted, but these attempts are not practical or feasible in terms of cumbersome desorption operations and waste of helium gas.

[0005] Therefore, an object of the present invention is to solve the above-mentioned disadvantages of the prior art.

[0006]

SUMMARY OF THE INVENTION The present invention addresses the above-mentioned disadvantages of the prior art by focusing on the fact that pressure is controlled by regulating the stroke of the diaphragm of the isolator. The problem is solved by adopting basic means for disposing a switching valve.

Specifically, the present invention connects an inlet port to a source of pressure fluctuations and connects one of a pair of outlet ports to an artificial heart and the other to a balloon pump.
A direction switching valve, an isolator disposed between the balloon pump and the other outlet port of the two-way switching valve, and
And a device for controlling at least switching of the two-way switching valve.

By switching the two-way switching valve, the artificial heart and the balloon pump can be easily operated by using one pressure fluctuation source, so that the conventional desorption operation is not required and waste of helium gas is prevented. it can.

[0009]

FIG. 1 shows a blood pump driving device 1. A compressor 2 as a positive pressure source is connected to a positive pressure accumulator tank, that is, a positive pressure reservoir 4 via a pressure regulating valve 3. A negative pressure pump 5 as a negative pressure source is connected to a negative pressure accumulator tank, that is, a negative pressure reservoir 7 via a pressure regulating valve 6. The positive pressure reservoir 4 can be selectively connected to an inlet port of a three-port two-way switching valve 9 via a positive pressure solenoid valve 8 as a switching valve means, and the negative pressure reservoir 7 is connected to the negative pressure solenoid valve 10. It can be selectively connected to the inlet port of the two-way switching valve 9 via the switch. A first outlet port of the two-way switching valve 9 is connected to an artificial heart 17 including a heart-lung machine pad or the like as a first blood pump,
Of the isolator 11 as a fluid conversion means
Connected to one of the rooms. The other chamber defined by the diaphragm 12 of the isolator 11 is connected via an electromagnetic valve 13 to a balloon pump 14 including a dynamic patch as a second blood pump. Reference numeral 15 denotes a helium gas suction / discharge mechanism. Helium gas is sealed in a pipe between the other chamber of the isolator 11 and the balloon pump 14. Air is sealed in other pipes. The isolator 11 in this example has the above-described configuration, so that one chamber is filled with air and the other chamber is filled with helium, and the air pressure fluctuation in one chamber is converted into the helium pressure fluctuation in the other chamber.

The two-way switching valve 9 enables automatic mechanical switching by using a manual mechanical switching motor by lever operation, electrical switching by a solenoid, and the like. And detect. The control device 16 will be described later. As shown in FIG. 4, the two-way switching valve 9 may employ a rotary valve that performs switching by rotating a rotor using a motor.

When it is necessary to operate the balloon pump 14, the isolator 11 is supplied with positive pressure through the two-way switching valve 9.
Connected to negative pressure sources 2 and 5. In this state, there is no transmission of positive pressure and negative pressure to the artificial heart 17. The opening and closing interval of the aortic valve is determined from the blood pressure and the electrocardiogram, and the positive pressure from the positive pressure pump 2 and the negative pressure from the negative pressure pump 5 are periodically opened and closed within the interval to open and close the solenoid valves 8 and 10. The air is supplied to one chamber of the isolator 11, and the diaphragm 12 is reciprocated. By regulating the stroke of the reciprocating motion of the diaphragm 12 with a stopper or the like, predetermined positive and negative pressures are periodically generated in the other chamber of the isolator 11, and the balloon pump 14 is contracted and expanded. The inflation of the balloon pump 14 results in an apparent increase in blood by its inflation volume, increasing blood pressure and allowing an increase in oxygen to the myocardium due to an increase in blood flow.

When the artificial heart 17 is operated, the two-way switching valve 9 is operated, and the positive / negative pressure sources 2 and 5 are directly connected to the artificial heart 17 via the two-way switching valve 9, so that the pulsation of the air pressure is generated. This allows the artificial heart 17 to contract and expand. As described above, by using the two-way switching valve 9, the artificial heart 17 and the balloon pump 14 can be provided in one device, and two positive and negative pressure sources are not required. The peak pressure to the artificial heart 17 is different from the peak pressure to the balloon pump 14, for example, 0.5 kgf / c to the artificial heart 17.
m ^2, since the balloon pump 14 to supply a gas pressure of 0.2 kgf / cm ^2, although the peak pressure of the upstream side, that the pump-side two-way changeover valve 9 is required to be 0.5 kgf / cm ^2, This pressure is high for the balloon pump 14,
By regulating the stroke of the diaphragm 12, the pressure can be converted into the pressure required for the balloon pump, so that the artificial heart 17 and the balloon pump 14 can be provided in one device. As shown in FIG. 4, a rotary valve 9 'may be used in place of the two-way switching valve 9. This rotary valve 9 ′ has a function of periodically switching a positive pressure source and a negative pressure source (2 and 5 in FIG. 1) to the artificial heart 17 or the balloon pump 14 by a motor (M) operated by a signal from the control device 16. .

Next, the operation of the control device 16 will be described. Driving pressure signals of positive pressure and negative pressure of the artificial heart 17 and the balloon pump 14 are sent to a control device 16, which controls the opening and closing of the solenoid valves 8 and 10, the opening and closing of the pressure regulating valves 3 and 6, or the compressor 2. And the rotation of the negative pressure pump 5 is controlled. A new control method for rising (falling) of the positive pressure and the negative pressure will be described with reference to FIG. Control device 16
Is, as shown in FIG. 2, a set value of the first positive pressure and the negative pressure (P
set 1 and Vset 1) and the set values (P
set 2 and Vset 2), and the control device 16 controls the artificial heart 17 or the balloon pump 14 while the solenoid valves 8, 10 produce a positive pressure output following a negative pressure output.
Until the positive drive pressure of the first set value reaches the first set value (Pset 1).
The pressure of the positive pressure reservoir 4 is maintained at the second set value (Pset 2), and while the solenoid valves 8 and 10 output the negative pressure following the positive pressure output, the artificial heart 17 or the balloon pump 14 Until the negative drive pressure reaches the first set value (Vset 1), it functions to maintain the pressure of the negative pressure reservoir 7 at the second set value (Vset 2). Positive and negative first set values (Pset 1 and Vse
After reaching t 1), the pressures of the positive and negative reservoirs 4 and 7 are adjusted to the first set values (Pset 1, Vset 1) until the next positive and negative outputs.

Further operation of the control device 16 will be described with reference to FIG. In step 10, whether the artificial heart or the balloon pump is selected is stored. In step 11, it is determined whether the balloon pump (IABP) has been selected. If it is determined that the balloon pump (IABP) is selected, the necessary control (step 13) for the balloon pump (IABP) is performed. If the circuit changes to the artificial heart (AH) during that time, an alarm is issued in step 12. ,
Call attention. If it is determined in step 11 that the operation mode is the artificial heart (AH) mode, AH control processing is performed in step 14, and if there is a circuit change to the balloon pump (IABP) during that time, an alarm is issued in step 15. As described above, if there is an unexpected mode change with respect to the initial selection mode, a warning is immediately issued, so that safe use is possible. If the selected control mode and the drive circuit do not match, an alarm is generated and a message is displayed. The operator turns off the power and reselects the control mode, or switches the drive circuit according to the control mode. When switching the drive circuit, turn off the power
It is not necessary to set to F, and the processing of the selected control mode is started when the drive circuit is switched.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a blood pump driving device according to an example of the present invention.

FIG. 2 is a timing chart illustrating positive / negative pressure control (within a reservoir).

FIG. 3 is a flowchart for a control device.

FIG. 4 is a partial block diagram showing a usage example of a rotary valve.

[Explanation of symbols]

 2, 5 Positive and negative pressure source 4, 7 Reservoir (accumulator tank) 8, 10 Solenoid valve 9 2-way switching valve 17 Artificial heart 11 Isolator 14 Balloon pump 16 Controller

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Abe 2-1-1 Asahi-cho, Kariya-shi, Aichi Aisin Seiki Co., Ltd. (72) Inventor Akihito Kikuta 2-1-1 Asahi-cho, Kariya-shi, Aichi Aisin Seiki Inside the corporation

Claims (8)

[Claims] 1. A two-way switching valve having an inlet port connected to a pressure fluctuation source and one of a pair of outlet ports connected to an artificial heart, and the other outlet port connected to a balloon pump. A blood pump drive device comprising: an isolator disposed between the other outlet port; and a device that at least controls switching of a two-way switching valve. 2. Air between the artificial heart and the source of pressure fluctuations.
2. The blood pump driving device according to claim 1, wherein helium gas is sealed between the isolator and the balloon pump. 3. A pressure fluctuation source comprising a compressor and a negative pressure pump, wherein a positive pressure reservoir and a positive pressure solenoid valve are provided between the compressor and the two-way switching valve, and a negative pressure pump and the two-way switching valve are provided between the negative pressure pump and the two-way switching valve. A negative pressure reservoir and a negative pressure solenoid valve, wherein the control device controls the first and second positive and negative pressures corresponding to the positive and negative drive pressures of the artificial heart and the balloon pump; 2. The blood pump driving device according to claim 1, wherein the pressure in the positive / negative pressure reservoir is controlled to the set value of. 4. While the solenoid valve is outputting a positive pressure following the negative pressure output, the pressure of the positive pressure reservoir is kept positive until the positive driving pressure of the artificial heart or the balloon pump reaches the first positive set value. Second
The blood pump driving device according to claim 3, wherein the control device operates to maintain the set value. 5. While the solenoid valve is outputting a negative pressure following the positive pressure output, the pressure of the negative pressure reservoir is reduced until the negative driving pressure of the artificial heart or the balloon pump reaches the negative first set value. Second
The blood pump driving device according to claim 3, wherein the control device operates to maintain the set value. 6. The blood pump driving device according to claim 1, wherein an alarm is issued when the control circuit of the artificial heart or the balloon pump selected by the control device and the driving circuit thereof do not match. 7. The blood pump driving device according to claim 1, wherein the two-way switching valve is a rotary valve. 8. A pressure change source for alternately supplying a positive pressure and a negative pressure of a first drive fluid, an inlet port connected to the pressure change source, and one of a pair of outlet ports connected to a first blood pump. A two-way switching valve for connecting the other outlet port to the second blood pump; and a pressure of the first driving fluid disposed between the second blood pump and the other outlet port of the two-way switching valve. A blood pump drive device comprising: a fluid conversion unit that converts a change into a pressure change of a second drive fluid; and a device that at least controls switching of a two-way switching valve.