JPH0638854B2 - Controller for infusion pump - Google Patents

Description

TECHNICAL FIELD The present invention relates to a control device for an infusion pump used in a medical drip device or the like.

<Prior Art> An infusion pump having an infusion actuating unit and injecting the infusion into the human body through a tube by the liquid feeding operation of the infusion actuating unit has conventionally been connected to the downstream side of the infusion infusion pump. Equipped with a sensor that detects the blockage of the tube, when the downstream blockage occurs and the internal pressure in the tube rises, the output of the sensor changes, the control device composed of a microcomputer etc. works and issues an alarm, The liquid feeding operation of the liquid transfusing unit is stopped.

Then, once the liquid supply operation is stopped, the infusion actuation section restarts the liquid supply operation only after the operator manually operates the start key after removing the cause of the blockage.

<Problems to be Solved by the Invention> However, in the related art, after the downstream occlusion occurs and the liquid supply operation by the liquid transfusing section is once stopped, the liquid transfusing section is restarted to restart the liquid feeding operation. In order to do so, the operator had to confirm the release of the blockage and operate the start key, so the operator had to move to the place where the infusion pump was located each time, and the operator was always required to buzzer. I had to be within the range of hearing the warning sound.

Therefore, there is a drawback that handling is very troublesome when temporary downstream occlusion frequently occurs due to the patient rolling over.

In view of the above, it is an object of the present invention to provide a control device for an infusion pump capable of automatically stopping the liquid feeding operation when a downstream blockage occurs in the tube and automatically restarting the liquid feeding operation after the blockage is released. To do.

<Means for Solving Problems> A problem solving means according to the present invention includes an infusion solution operating portion 1 as shown in FIGS. 1 to 4, and a liquid delivery operation of the infusion solution operating portion 1 passes through a tube 2. In the infusion pump for infusion, the tube 2 downstream of the infusion actuation unit 1
The sensor 3 whose output level changes according to the change of the internal pressure, and the output of the sensor 3 is the judgment reference value N1 for the downstream blockage.
When the above is reached, the first determination means 4 that outputs a command to stop the infusion actuation unit 1 and when the output of the sensor 3 becomes less than or equal to the restart condition value N0 at the time of blockage release after stopping the liquid feeding operation The second determination means 5 that outputs a command to restart the operation of the infusion operation part 1 and the operation of the infusion operation part 1 are interrupted or automatically restarted by a command from the first determination means 4 or the second determination means 5. And a driving means for driving.

<Operation> In the above problem solving means, when the internal pressure in the tube 2 changes, the output level of the sensor 3 changes. Then, when the tube 2 is blocked downstream and the output of the sensor 3 becomes equal to or higher than the determination reference value N1, the first determination means 4 issues a stop command to the infusion operation portion 1 to stop the liquid feeding operation. After this stop, when the closed state of the tube 2 is released and the output of the sensor 3 becomes equal to or lower than the restart condition value N0, the second determination means 5 issues a restart command to the infusion operation section 1 to automatically restart the liquid transfer operation. . Therefore, there is no need for the operator to confirm that the occlusion has been released and to restart the occlusion, and in the case of a temporary occlusion due to the patient rolling over, the infusion may be suspended even if the operator is not always nearby. It is possible to infuse with confidence.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram of essential parts showing an embodiment of a control device for an infusion pump according to the present invention, FIG. 2 is the same overall configuration diagram, and FIG. 3 is an operation flowchart of the central processing unit. Similarly, FIG. 4 is a diagram showing the relationship between the output signal of the sensor and the outer diameter of the tube.

As shown in the figure, the control device for an infusion solution infusion pump according to the present invention includes an infusion solution operation part 1, and an infusion solution operation part 1 is configured to infuse the solution through a tube 2 in the infusion solution operation part. Sensor 3 whose output level changes according to the change of internal pressure in the tube 2 on the downstream side of 1
When the output of the sensor 3 becomes equal to or higher than the determination reference value N1 of the downstream blockage, the first determination means 4 that stops the infusion actuation unit 1, and when the output of the sensor 3 is released after the stop of the liquid feeding operation The second determination means 5 for restarting the infusion actuation unit 1 when the resumption condition value N0 or less is reached.

The tube 2 has elasticity so that the outer diameter changes according to the change in the internal pressure, and one end of the tube 2 is connected to the infusion bag 6 and the other end is connected to the human body 7 side.
The liquid transfusing section 1 is driven by an external drive mechanism to perform a liquid feeding operation, and is inserted in the middle of the tube 2. The sensor 3 detects a change in internal pressure due to a change in outer diameter of the tube 2, and is provided so as to be in close contact with the tube 2 from the outside. It should be noted that the sensor 3 may be any one of which the resistance value, the current value, the voltage value, the oscillation frequency or the like changes depending on the change of the outer diameter of the tube 2, and the semiconductor sensor, the coil with the core, the force-sensitive resistor , Strain gauge, etc. may be used. The sensor 3 is connected to the microcomputer 9 via the interface 8.

The microcomputer 9 is a central processing unit (CPU) 1
0, a program ROM 11, a data RAM 12 and the like. As shown in FIG. 1, the central processing unit 10 is provided with the first determination means 4 and the second determination means 5.
The central processing unit 10 is connected to the infusion actuation unit 1 via the interface 13 and is also connected to the alarm transmission means 15 via the interface 14 so that the infusion actuation unit 1 receives a stop command and an alarm transmission unit 15 at the time of downstream blockage. A warning command is issued to the infusion actuation unit 1 when the blockage is released, and a warning stop command is issued to the warning transmission means 15. The alarm transmission means 15 is composed of an alarm lamp, a buzzer and the like.

In the above-mentioned configuration, when infusing into the human body 7, the infusion actuating portion 1 is driven by an external drive mechanism, and the liquid feeding operation causes the liquid 16 in the infusion bag 6 to pass through the tube 2 and a.
Liquid is delivered in the direction of the arrow.

During this liquid transfer, the sensor 3 that is in close contact with the outside of the tube 2 detects an increase or decrease in the tube outer diameter due to a change in pressure inside the tube 2. If there is an increase or decrease in the tube outer diameter, the sensor 3
Output changes. Then, based on the information from the sensor 3, it is determined whether the first determination means 4 and the second determination means 5 of the central processing unit 10 have caused the downstream blockage, and whether or not the blocked state has been released after that. Always monitor and judge.

At the time of downstream blockage, the alarm transmission means 15 is turned on to give an alarm, and a stop command is issued to the liquid transfusing section 1 to stop the liquid sending operation. When the blockage is released, the alarm transmission means 15 is turned off. At the same time as returning to the state, a command to restart the liquid transfusing unit 1 is issued to restart the liquid feeding operation.

Next, a specific description will be given with reference to an operation flowchart of the central processing unit 10 shown in FIG. However, the output signal of the sensor 3 is assumed to change linearly as shown in FIG. 4 according to the change in the outer diameter of the tube 2. The outer diameter R0 is the outer diameter of the tube 2 in the normal state, and the outer diameter R1 is the outer diameter when the tube 2 is inflated due to the downstream blockage.

The central processing unit 10 waits for the liquid transfusing section 1 to be driven and the liquid feeding operation to be started (step), and when the liquid feeding operation is started, the sensor output is sampled at a predetermined sampling interval Δt. (Step),
Based on the sampling value D, the first determination means 4 determines whether or not downstream blockage has occurred (step).

Then, the downstream blockage has not occurred, and the sampling value D
Is smaller than the judgment reference value N1, the process returns to the step and sampling is carried out again. However, if the sampling value D becomes equal to or larger than the judgment reference value N1 due to the downstream blockage, an alarm is issued by the alarm transmission means 15 and at the same time, the infusion actuation unit. 1
To stop the liquid transfer operation (step,
).

After the suspension of the liquid feeding operation, the sampling interval Δt
Sampling is performed (step), and the blockage release is determined based on the sampling value D (step). That is, if the sampling value D is larger than the resumption condition value N0, the tube 2 is still in the closed state, so the procedure returns to step and sampling is performed again, but the temporary closed state is released due to the patient turning over and the like. When the sampling value D becomes equal to or less than the restart condition value N0, a restart command is issued to the liquid transfusing section 1 to automatically restart the liquid feeding operation (step). Therefore, when the downstream blockage is released by the operation from step to step, the second determination means 5 determines it, and the infusion operation unit 1 automatically restarts the liquid transfer operation by the restart command. It is not necessary to input the key (switch) by a simple operator.

The present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

For example, in the above embodiment, the absolute value is used as the step and the determination value of the step, but the relative value may be used. Further, the sensor is not limited to the one in which the outer diameter of the tube 2 and the output have a linear relationship, but may have an exponential function, a square proportional relationship, or the like. Further, the first determination unit 4 and the second determination unit 5 may be configured by hardware without using the microcomputer 9.

<Effects of the Invention> As is apparent from the above description, according to the present invention, when the liquid is transfused through the tube by the liquid feeding operation of the liquid transfusing section, a change in the internal pressure in the tube downstream of the liquid transfusing section is detected. When the sensor output exceeds the judgment value for downstream blockage, the infusion operation unit is stopped to suspend the liquid transfer operation, and when the sensor output falls below the restart condition value when the blockage is released after the liquid transfer operation is stopped, the infusion operation starts. Since the liquid feeding operation can be automatically restarted by driving the part, it is possible to eliminate the wasteful work of the operator to confirm the occlusion release and restart the operation as in the past, and also to prevent the patient from rolling over. In the case of a temporary blockage, the infusion does not remain suspended even if the operator is not always in the vicinity, so the infusion can be performed with peace of mind.

Moreover, when the liquid delivery operation is restarted, it is possible to continue the operation state before the stop, and the infusion information after the restart takes over the infusion information before the stop, compared to the case of resetting and restarting. It is not necessary to input the information again, and the convenience can be further improved.

[Brief description of drawings]

FIG. 1 is a block diagram of an essential part showing an embodiment of a control device for an infusion pump according to the present invention, FIG. 2 is an overall configuration diagram, FIG. 3 is an operation flowchart of the central processing unit, and FIG. Similarly, the figure is a diagram showing the relationship between the output signal of the sensor and the outer diameter of the tube. 1: Infusion actuation part, 2: Tube, 3: Sensor, 4: First judging means, 5: Second judging means.

Claims (1)

[Claims] 1. An infusion pump having an infusion actuation unit, wherein the infusion actuation of the infusion actuation unit causes infusion through a tube, the output level is changed by a change in internal pressure in the tube downstream of the infusion actuation unit. A changing sensor,
First determining means for outputting a command to stop the infusion actuation unit when the output of the sensor becomes equal to or higher than the determination reference value for downstream blockage; and a restart condition when the output of the sensor is released after blockage of the liquid supply operation A second determination means for outputting a command to restart the operation of the infusion operation part when the value becomes less than or equal to a value, and the operation of the infusion operation part is interrupted or automatically according to the command from the first determination means or the second determination means. A control device for an infusion pump, comprising: