JP2593761Y2 - Circuit clamp drive control device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit clamp drive control device. It is suitable for application to an apparatus.

[0002]

2. Description of the Related Art For example, an artificial dialysis apparatus uses an extracorporeal filtration through a dialysis membrane as an artificial kidney to remove waste products and excess moisture in blood instead of the original kidney. Dialysis is a well-established medical treatment that patients with renal failure receive on a regular basis.

[0003] The blood circuit of such an artificial dialysis apparatus has conventionally been configured, for example, as shown in FIG.

In FIG. 2, blood drawn from a patient's artery 1 by a blood extracorporeal circuit (to a tube) by a blood pump 2 is supplied to a dialyzer 3. The dialyzer 3 is also supplied with dialysate by a dialysate circuit 4. In the dialyzer 3, blood and dialysate flow in opposite directions through the dialysis membrane, whereby waste and excess water in the blood move to the dialysate side. Blood from which wastes and excess water have been removed is supplied to the drip chamber 5.
, And is dropped inside from the upper surface of the chamber, and the dialyzed blood contained in the drip chamber 5 is discharged from the lower end of the drip chamber 5 to the extracorporeal blood circulation tube (tube) and returns to the patient vein 6.

The drip chamber 5 is provided so that the venous pressure sensor 7 can detect the venous pressure by a change in the pressure of the gas above the drip chamber 5.

The drip chamber 5 is provided in consideration of preventing air bubbles from being supplied to the patient through the dialyzed blood. When air bubbles enter human blood, it is dangerous to affect human life.
You must avoid it.

For example, when air bubbles enter the blood after dialysis due to abnormal connection between the dialyzer 3 and a tube as an extracorporeal blood circulation path, the air bubbles are absorbed by the drip chamber 5 into the upper chamber of the drip chamber 5. But,
Due to the increase in the absorption bubbles, the amount of blood contained in the drip chamber 5 decreases, and the bubbles may remain in the patient vein 6 as it is.
Get into it. Therefore, there is provided a liquid level monitoring device for monitoring the liquid level position of the drip chamber 5, which is composed of the ultrasonic transmitter 8, the ultrasonic receiver 9, and the bubble detecting circuit 10. When a drop in the liquid level of the drip chamber 5 from a predetermined position is detected (when a possibility that air bubbles enter the patient's body is detected), a control structure (not shown) is provided below the drip chamber 5, for example, a solenoid. The circuit clamp 11 of the drive system is closed and driven to close the extracorporeal blood circulation path (tube) for returning to the patient vein 6 to prevent air bubbles from entering the body.

When the liquid level monitoring devices 8 to 10 detect, the control structure not shown also stops the blood pump 2.

In practice, in addition to such a structure for preventing air bubbles from flowing into the body, there is also provided another structure for preventing air bubbles from flowing into the body.

[0010]

As described above, the safety of an artificial dialysis device is enhanced by preventing air bubbles from flowing into the body by means of a plurality of types of structures. It is desired that each type of configuration that prevents inflow has high reliability by itself.

However, the above-described configuration in which the circuit clamp 11 is closed to prevent air bubbles from flowing into the body cannot always be said to be highly reliable. That is, even if a control configuration (not shown) activates the closing operation of the circuit clamp 11, the circuit clamp 11 may not operate. In order to solve such inconvenience, the circuit clamp 1
1 is provided with a sensor for detecting the operation of the circuit clamp 11.
If this sensor does not perform the detection operation at the time of the drive instruction, it may be possible to instruct the circuit clamp 11 to drive again. However, if an abnormality occurs on the control configuration side that instructs driving of the circuit clamp 11, such a measure does not make sense.

The above-mentioned problem occurs not only in an artificial dialysis apparatus but also in another apparatus (for example, a component blood donating apparatus) which extracts blood outside the body, performs predetermined processing, and then returns the blood to the body. I have.

Further, in practice, when the circuit clamp 11 is closed and driven, it is not limited to the case where the liquid level monitoring devices 8 to 10 detect a decrease in the liquid level position in the drip chamber 5 (increase in bubbles). The circuit clamp 11 is also closed when the venous pressure sensor 7 or a blood leakage sensor (not shown) detects an abnormality. In such a case, the same problem as described above occurs.

The present invention has been made in view of the above points, and has been made to provide a circuit clamp drive control device that can reliably drive a circuit clamp when an abnormal state occurs in which the circuit clamp is closed and driven. Things.

[0015]

According to the present invention, blood is taken out of the body, subjected to a predetermined treatment, and then returned to the body. In an extracorporeal circulating blood treatment device equipped with a circuit clamp that can be closed and stopped,
(1) an abnormality occurrence monitoring means for detecting an abnormal state in which the circuit clamp needs to be closed; and (2) a first operation for activating a circuit clamp closing operation when the abnormality occurrence monitoring means detects an abnormal state. Drive control means, (3) circuit clamp operating state detecting means for detecting whether the circuit clamp is closed, and (4) the circuit within a predetermined time from the time when the abnormality occurrence monitoring means detects the abnormal state. When the signal indicating the closed state is not given from the clamp operating state detecting means,
And second drive control means for activating the closing operation of the circuit clamp.

Here, at least two circuit clamps are used.
It is a preferable embodiment to provide a different number of circuit clamps for activating the closing operation by the first and second drive control means.

[0017]

According to the present invention, the blood is taken out of the body, subjected to a predetermined process, and then returned to the body. The circuit is provided with a circuit clamp capable of closing and stopping the circulation of extracorporeal blood. An extracorporeal circulating blood processing apparatus is assumed.

When the abnormality occurrence monitoring means detects an abnormal state in which the circuit clamp needs to be closed, the first drive control means activates the circuit clamp closing operation. However, even with this activation, the circuit clamp may not be closed due to some abnormality. The second drive control means recognizes that the signal indicating the closed state is not given from the circuit clamp operation state detection means within a predetermined time after the abnormality occurrence monitoring means detects the abnormal state. Then, the closing operation of the circuit clamp is activated.

In this manner, the reliability of the closing operation of the circuit clamp can be improved.

Here, at least two circuit clamps are used.
If the first and second drive control means use different circuit clamps for activating the closing operation, extracorporeal blood circulation can be performed more reliably even if the circuit clamp itself for which the first closing drive is activated has an abnormality. Will be able to stop the circulation.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an artificial dialysis apparatus will be described below in detail with reference to the drawings. Here, FIG. 1 shows a main part configuration of the artificial dialysis apparatus of the embodiment, and FIG.
The same and corresponding parts as those shown in FIG.

As shown in FIG. 1, the blood circuit of this embodiment is the same as the blood circuit of the conventional artificial dialysis apparatus.
That is, the blood drawn out of the body from the patient's artery 1
The blood pump 2, the dialyzer 3, and the drip chamber 5 sequentially return to the patient vein 6.

Further, a venous pressure sensor 7 for detecting venous pressure from the pressure in the upper chamber of the drip chamber 5, an ultrasonic transmitter 8 and an ultrasonic receiver 9 opposed to each other across the drip chamber 5, an ultrasonic wave The point that an air bubble detection circuit 10 for controlling the transmission of the transmitter 8 and taking in the output of the ultrasonic receiver 9 to detect air bubbles is provided is the same as the conventional one.

However, a monitoring configuration for preventing air bubbles from flowing into the body, a drive control configuration of the circuit clamp 11, and the like are different from those in the related art. Further, a point that a micro switch 12 for detecting whether or not the circuit clamp 11 is performing a closing operation is provided is different from the related art.

The components other than the blood circuit shown in FIG. 1 mainly show processing components related to air bubbles in blood.

The artificial dialysis apparatus according to this embodiment includes a main CPU 20 and a sub CPU 30 as CPUs for controlling the system. The main CPU 20 executes sequence control of the entire system, and the sub CPU 30 mainly executes functions such as monitoring and self-diagnosis. The main CPU 20 and the sub CPU 30 are completely separated from a power supply, a system bus, various input / output ports, and the like.

In relation to bubble processing, the main CPU 20
A bubble alarm monitoring unit 21, a bubble alarm processing unit 22, and a bubble override switch reading unit 23 are provided in relation to the. Each of these units 21, 22, and 23 is shown functionally, and is actually configured by an input / output port having the function, a program in the ROM, and the like.

The bubble alarm monitoring section 21 monitors whether or not the above-described bubble detection circuit 10 has detected the presence of bubbles in the post-dialysis blood based on the output of the ultrasonic receiver 9. The bubble alarm monitoring unit 21 notifies the main CPU 20 when the bubble detection circuit 10 performs a detecting operation, and activates the bubble alarm processing unit 22.

The bubble alarm processing unit 22 includes a main CPU
When the process is started by the circuit clamp 20, the drive circuit of the circuit clamp 11 (not shown) is operated to operate the circuit clamp 11.
Is closed, and the operation of the blood pump 2 is stopped by stopping the drive circuit of the blood pump 2 (not shown).

The bubble override switch reading unit 23
This is to detect that the bubble override switch 13 has been pressed and notify the main CPU 20. Main C
During a predetermined time (for example, two minutes) after the bubble override switch 13 is pressed, the PU 20 cancels the bubble alarm notification from the bubble alarm monitoring unit 21 even if given, and starts the bubble alarm processing unit 22. Never. Such a process is provided in consideration of the fact that the recovery operation cannot be performed if the bubble alarm process is executed even when the system is restored after the system is down due to the occurrence of bubbles or the like.

On the other hand, in relation to bubble processing,
In connection with 30, a bubble alarm monitoring unit 31, a circuit clamp operation monitoring unit 32, a circuit clamp operation unit 33, a self-diagnosis control unit 34, and a bubble override switch reading unit 35 are provided. Each of these parts 31, 32, 3
3, 34 and 35 are also functionally shown, respectively.
Actually, it is constituted by an input / output port having the function and a program in the ROM.

The bubble alarm monitoring unit 31 and the bubble override switch reading unit 34 related to the sub CPU 30
The function is similar to that of the bubble alarm monitoring unit 21 and the bubble override switch reading unit 23 related to the main CPU 20, and the description thereof is omitted.

The circuit clamp operation monitoring section 32 monitors the operation state of the circuit clamp 11 based on an output signal from the microswitch 12 for detecting the operation state of the circuit clamp 11, and the circuit clamp 11 controls the extracorporeal blood circulation path. This is to notify the sub CPU 30 of whether or not it is blocked.

The circuit clamp operating section 33 includes a sub CPU 3
When the drive is instructed from 0, the drive circuit of the circuit clamp 11 (not shown) is operated to close the circuit clamp 11. After receiving the notification of the bubble alarm from the bubble alarm monitoring unit 31, the sub CPU 30 performs a predetermined time (a time sufficiently shorter than the time from when the bubble detection circuit 10 detects the bubble generation to when the bubble reaches the patient's internal vein 6). If the notification that the circuit clamp 11 has been operated is not obtained from the circuit clamp operation monitoring unit 32 in (), the circuit clamp operation unit 33 is instructed to perform closing drive. That is, when the circuit clamp 11 does not perform the closing operation according to the instruction from the main CPU 20, the sub CPU 30 again instructs the activation of the closing operation.

The self-diagnosis control unit 34 includes a sub-CP
In response to an instruction from U30, the bubble detection circuit 10 is controlled to execute two types of self-diagnosis operations.

The first self-diagnosis operation is performed before starting dialysis. The first self-diagnosis operation is to stop the transmission operation of the ultrasonic transmitter 8 so that the output signal from the ultrasonic receiver 9 is the same as that at the time of bubble detection. Then, a bubble alarm is output from the bubble detection circuit 10 to check whether the processing by the bubble alarm processing unit 22 of the main CPU 20 is normally executed. The sub CPU 30 confirms the diagnosis result based on the output from the circuit clamp operation monitoring unit 32.

The second self-diagnosis operation is executed at regular intervals during dialysis. The second self-diagnosis operation is to attenuate the transmission operation of the ultrasonic transmitter 8 at predetermined intervals (20 msec) so that the output signal from the ultrasonic receiver 9 is the same as that at the time of bubble detection. When it is detected that the output signal of the ultrasonic receiver 9 indicating the bubble detection does not continuously arrive for a time slightly longer than the period (30 msec), a system abnormality notification is sent to the bubble alarm monitoring unit 31. To the sub CPU 30 to execute the system abnormality processing.

In the artificial dialysis apparatus having the above-described components, the following operation is performed to prevent air bubbles from entering the patient's body.

Before dialysis, under the control of the sub CPU 30, the self-diagnosis control unit 34 executes the above-described first self-diagnosis operation, and each unit to be operated when air bubbles are generated during dialysis operates normally. Check.

Also, during dialysis, the sub CPU 30
The self-diagnosis control unit 34 executes the above-described second self-diagnosis operation under the control of the above, and the bubble monitoring device (hardware) of the ultrasonic transmitter 8, the ultrasonic receiver 9, and the bubble detection circuit 10 Repeatedly confirm that the condition is normal to detect occurrence.

During the dialysis in which it has been confirmed that the bubble monitoring devices 8 to 10 can operate normally in this way, if bubbles are generated in the blood after dialysis and the liquid level in the drip chamber 5 drops, the ultrasonic receiver 9 The output becomes small, the bubble detection circuit 10 outputs a bubble alarm, and the bubble alarm monitoring units 21 and 31 recognize this.

Thus, the main CPU 20 activates the bubble alarm processing section 22 to stop the rotation of the blood pump 2 and to close the circuit clamp 11.

Here, it is assumed that the circuit clamp 11 does not perform the closing operation due to some abnormality. At this time, the detection signal from the microswitch 12 indicates that the circuit clamp 11 is not closed, and the circuit clamp operation monitoring unit 32 notifies the sub CPU 30 that the circuit clamp 11 is not closed. .

The sub CPU 30 includes the bubble alarm monitoring unit 3
After receiving the notification of the bubble alarm from 1, within a predetermined time,
Since a notification that the circuit clamp 11 has been operated is not obtained from the circuit clamp operation monitoring unit 32, the circuit clamp operation unit 33 is instructed to drive. The circuit clamp operating part 33 is
The circuit clamp 11 is driven to close.

In practice, when the circuit clamp 11 is closed and driven, the drive unit of the blood pump 2 stops rotating by the hardware configuration.

Even if the main CPU 20 activates the bubble alarm processing section 22 to close the circuit clamp 11, the circuit clamp 11 does not operate, which means that there is a possibility that some trouble has occurred in the apparatus itself. Therefore, for example, the sub CPU 30 causes the display unit (not shown) to display a machine trouble, and then stops the operation of the entire apparatus.

Therefore, according to the above-described embodiment, when the closing operation is not activated even when the closing operation is started for the circuit clamp 11, the closing operation is started again. A closing operation can be performed. A CPU for activating the first closing drive;
Since the CPU that starts the second closing drive that is performed when the closing is not performed at the first start is changed, the circuit clamp 11 can be more reliably closed as compared with the related art.

As a result, air bubbles can be effectively and reliably prevented from entering the patient.

In the above embodiment, one circuit clamp 11 is shown. However, the present invention can be applied to an artificial dialysis apparatus having two or more circuit clamps. For example, in the case where two circuit clamps are provided, the first CPU performs the first closing activation on the first circuit clamp.
The second closing activation may be performed by the second CPU with respect to the second circuit clamp, and the first closing activation may be performed by the first CPU with respect to the first circuit clamp. May be performed by the first CPU with respect to the second circuit clamp, and the third closing activation may be performed by the second CPU with respect to the second or first circuit clamp. It is possible.

In the above embodiment, the cause of closing the circuit clamp 11 is that bubbles are mixed in the blood after dialysis.
This is characterized in the closing drive control of the first embodiment, and the activation cause is not limited to the above-described embodiment. For example, the closing drive of the circuit clamp 11 is performed when the venous pressure sensor 7 detects an abnormal venous pressure or when a blood leak sensor (not shown) detects that blood in the blood circuit leaks to the dialysate circuit side. The control method of the present invention can be applied to control.

Further, the apparatus to which the present invention is applied is not limited to an artificial dialysis apparatus, but may be any external blood circulation processing apparatus which takes blood out of the body, performs predetermined processing, and returns the blood to the body. Can be applied.

[0052]

As described above, according to the present invention, in the extracorporeal circulating blood processing apparatus, the abnormality occurrence monitoring means for detecting an abnormal state in which the circuit clamp needs to be closed, and the abnormality occurrence monitoring means are provided with an abnormality. A first drive control unit for activating a closing operation of the circuit clamp when detecting a state; a circuit clamp operating state detecting unit for detecting whether the circuit clamp is closed; The second drive control means for activating the closing operation of the circuit clamp when the signal indicating the closed state is not given from the circuit clamp operating state detecting means within a predetermined time from the time when the When an abnormal state occurs in which the clamp is closed and driven, the circuit clamp can be reliably driven.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a main part of an artificial dialysis device according to an embodiment.

FIG. 2 is a block diagram showing a configuration around a blood circuit of the artificial dialysis device.

[Explanation of symbols]

5 drip chamber, 8 ultrasonic transmitter, 9 ultrasonic receiver, 10 bubble detection circuit, 11 circuit clamp, 1
2 micro switch, 20 main CPU, 21 bubble alarm monitoring unit, 22 bubble alarm processing unit, 30
Sub CPU, 31: bubble alarm monitoring unit, 32: circuit clamp operation monitoring unit, 33: circuit clamp operation unit.

Claims (2)

(57) [Scope of request for utility model registration] 1. An extracorporeal circulation system for removing blood outside the body, performing predetermined processing on the blood, and returning the blood to the interior of the body. The extracorporeal circulation having a circuit clamp capable of closing and stopping the circulation of extracorporeally circulating blood. In the blood processing apparatus, an abnormality occurrence monitoring unit that detects an abnormal state that requires closing the circuit clamp, and a second operation that starts an operation of closing the circuit clamp when the abnormality occurrence monitoring unit detects an abnormal state. 1 drive control means, circuit clamp operating state detecting means for detecting whether the circuit clamp is closed, and circuit clamp operating within a predetermined time from the time when the abnormality occurrence monitoring means detects an abnormal state. A second drive control means for activating the closing operation of the circuit clamp when a signal indicating the closed state is not supplied from the state detecting means; Circuit clamp drive control device according to claim. 2. The circuit clamp according to claim 1, wherein at least two circuit clamps are provided, and the first and second drive control means have different circuit clamps for activating the closing operation. Drive control device.