JPH0659311B2 - Infusion pump - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infusion pump, and more specifically, to an infusion pump used for infusion into a human body from an infusion bag in a medical drip device or the like, When the tube is clogged, the infusion actuation unit is controlled and the operator is notified.

2. Description of the Related Art Conventionally, in an infusion pump that injects an infusion solution into a human body through a tube by an infusion solution operation part provided in a tube for infusion from the infusion bag to a human body, etc. If a tube blockage occurs for some reason on the downstream side of the section, a mechanism is provided for detecting the blockage and controlling the infusion operation section. As the means for detecting the downstream blockage, a sensor whose output changes in accordance with a change in pressure inside the tube is generally used. Specifically, when a blockage occurs, a pressure increase in the tube caused by the blockage is detected by the sensor, and a control mechanism such as a computer connected to the sensor determines the blockage, issues a warning, and sends liquid to the infusion actuation unit. I am trying to stop the operation.

In the above-mentioned conventionally used infusion pump, after the downstream occlusion occurs and the infusion operation of the infusion actuation unit is temporarily stopped, the tube internal pressure cannot be detected and determined until the next infusion operation is restarted. Not done. Therefore, even when the downstream blockage is released, the liquid sending operation remains stopped.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention With the above-described configuration, in the conventional infusion pump, when the downstream occlusion occurs and the infusion operation is temporarily stopped, the operator confirms the downstream occlusion release manually and manually. Must restart. In addition, when the obstruction occurs due to a temporary cause such as a patient rolling over, it is not convenient for the operator to determine whether or not the downstream obstruction has been released, which is a problem.

The present invention solves the above-mentioned problems in the conventional infusion pump, and informs the operator that the infusion operation can be restarted when the downstream obstruction is released after the operation is temporarily stopped due to the occurrence of the downstream obstruction. The purpose is to inform.

Means for Solving the Problems In order to achieve the above object, the present invention is provided with an infusion actuation section, and through a tube by a solution sending operation of the infusion actuation section,
In an infusion pump for infusing a human body from an infusion bag, a sensor whose output level changes according to a change in the internal pressure in the tube on the downstream side of the infusion operation part, and a tube internal pressure output from the sensor connected to the sensor However, when it becomes larger than the judgment reference value of the blockage stop condition value, the first judgment means for judging that the downstream blockage has occurred and stopping the infusion operation part, and the judgment criterion of the restart condition value of the tube internal pressure after the stoppage of the infusion operation part When the value is smaller than the value, a control means having a second determination means for determining the downstream blockage cancellation, and a controller connected to the control means, the first determination means determining the occurrence of the downstream blockage and the second determination means for the downstream blockage cancellation And an information transmitting means for displaying the judgment of No. 1.

More specifically, a microcomputer is used as a control unit having the first determination unit and the second determination unit,
The sensor is connected to the microcomputer, the tube internal pressure input from the sensor is compared and judged by the first judgment means with the occlusion stop condition value and the second judgment means with the resumption condition value, and the connection is made based on the judgment. A display command is issued to the information transmitting means, and the information transmitting means including an LED, an LCD, etc. displays the downstream blockage and its release, or
In the information transmission means equipped with a buzzer or the like, the buzzer gives an alarm when the downstream blockage and its release occur.

Action By using the above-mentioned infusion pump, when the downstream blockage occurs, the driving of the infusion operation part is automatically stopped and the liquid feeding operation is stopped, while when the downstream blockage is released, a display or alarm is issued. With this, the operator can easily know this and can restart the liquid transfer operation.

Examples Hereinafter, the present invention will be described in more detail with reference to the examples shown in the drawings.

As shown in FIG. 1, the infusion pump includes an infusion bag 1
Liquid 11 such as drip by the liquid feeding operation of the liquid transfusing section 4 interposed in the tube 2 to the human body 3 through the tube 2.
Is continuously injected.

The liquid transfusing section 4 is driven by an external drive mechanism (not shown) to perform a liquid feeding operation. The tube 2 has elasticity, and when the internal pressure of the liquid 11 increases,
It expands and the outer diameter increases.

A sensor 5 is closely attached to the outer periphery of the tube 2 on the downstream side of the infusion operation section 4. The sensor 5 is only required to be able to convert a change in the outer diameter of the tube 2 into any change in resistance value, current value, voltage value, oscillation frequency, etc. For example, a semiconductor sensor, a coil with a core, force Sensory resistor,
A strain gauge or the like is used. The relationship between the sensor output and the tube outer diameter is a linear relationship in this embodiment, as shown in FIG. In FIG. 3, R0 and R1 represent the tube outer diameter in the normal state and the downstream blockage occurrence state, respectively.

The sensor 5 is connected to a microcomputer 6 via an interface 8, and the microcomputer 6
Are connected to the information transmission means 7 and the infusion actuation section 4 via interfaces 9 and 10, respectively.

The microcomputer 6 includes a CPU 12, a program ROM 13, and a data RAM 14. Second
As shown in the figure, the CPU 12 includes a first determination unit 15 for determining the occurrence of blockage of the tube 2 on the downstream side of the infusion operation unit 4, and a second determination unit 1 for determining the release of the downstream blockage.
6 is provided so as to operate in accordance with the flowchart shown in FIG. That is, the tube internal pressure (sampling value D) from the sensor 5 once read into the data RAM 14 is stored in the program ROM 13 in advance in the first determining means 15 and corresponds to the tube internal pressure when the tube is closed (ie, the tube internal pressure). , A judgment reference value N1 which is a blockage stop condition value for stopping the infusion actuation unit due to blockage, and a value corresponding to the tube internal pressure in the second determination means 16 (that is, the infusion actuation unit). It is compared with the judgment reference value N0) which is the restart condition value that enables the restart. When the first determination means 15 determines that the downstream occlusion has occurred by the above comparison, a stop command is output to the infusion operation section 4 and an alarm command is output to the information transmission means 7, and the second determination means 16 is also output. When it is determined that the internal pressure of the tube is low and the closed state has been resolved after the downstream blockage has once occurred, the restartable command is output to the information transmission means 7.

As shown in FIGS. 5 to 8, the information transmission means 7 is composed of a display device composed of an LED or LCD. When it is determined that the downstream blockage has occurred, the indicator indicates “STOPPED by OCC” as shown in FIG.
LUSION "(stopped due to blockage) is displayed in English and the sixth
As shown in the figure, the fact that the internal pressure of the tube has reached the maximum closing pressure is shown by expanding the bar B to the maximum size of 7, and a bar graph is displayed. Similarly, when it is determined that the downstream block has been released, as shown in FIG.
"RESTART" (restartable), the bar is eliminated in Fig. 8 to notify the operator that the internal pressure of the tube has returned to the normal pressure and the downstream blockage has been released. Further, an alarm such as a buzzer is issued together with the above display.

Next, the operation of the infusion injection pump control device will be described with reference to the flowchart of FIG.

In the case of infusion into the human body 3, first, the infusion actuation unit 4 is driven by an external drive mechanism, and the infusion bag 1
The liquid 11 therein is sent through the tube 2. During this liquid feeding, the sensor 5 that is in close contact with the tube 2 detects an increase or decrease in the tube outer diameter due to a change in the internal pressure in the tube 2, and if the tube outer diameter increases or decreases, the output of the sensor 5 changes. Microcomputer 6 connected to sensor 5
CPU 12 performs sampling of the tube internal pressure based on the detection signal input from the sensor 5 (step #
1). Specifically, the output of the sensor 5 is input as the sampling value D to the CPU 12 via the interface 8 at a predetermined sampling interval.

The sampling value D input to the CPU 12 is compared with the judgment reference value N1 of the stop condition value by the first judgment means 15. (Step # 2) The determination reference value N1 corresponds to the sensor output value N1 when the tube outer diameter is inflated due to downstream blockage, as shown in FIG. If the sampling value D is smaller than the judgment reference value N1, (D <N
1), it is determined that it is not in the downstream blocking state, the process returns to step # 1 and the sampling is repeated. On the other hand, the sampling value D
Is greater than or equal to the determination reference value N1 (D ≧ N1), it is determined that the downstream blockage has occurred.

When it is determined that the downstream blockage has occurred, the CPU 12 sends an alarm command to the information transmission means 7 via the interface 9, and performs the blockage display shown in FIGS. 5 and 6 and issues an alarm. At the same time, the CPU 12 gives a stop command to the liquid transfusing unit 4 via the interface 10 to stop the liquid feeding operation. (Step # 3) Even after the liquid feeding operation is stopped, the tube 2 in the sensor 5
Continue to detect the internal pressure of the
Continue sampling at U12. (Step # 4) Next, the second determination means 16 of the CPU 12 compares the sampling value D with the determination reference value N0 of the restart condition value. (Step # 5) The judgment reference value N0 is a sensor output when the tube outer diameter is in a normal state as shown in FIG. If the sampling value D'sampled in step # 4 is larger than the judgment reference value N0 (D '> N
0), it is determined that the downstream blocking state has not been released, and the process returns to step # 4 to repeat sampling. On the contrary, if the sampling value D ′ is smaller than the judgment reference value N0 (D ′ ≦
N0) It is determined that the downstream blocking state has been released.

If it is determined in step # 5 that the downstream blocking state has been released, the information transmission means 7 displays that restarting is possible by the method shown in FIGS. 7 and 8, and at the same time issues an alarm and operates. Inform the person. (Step # 6) The present invention is not limited to the above embodiment. For example, although the relationship between the sensor output and the outer diameter of the tube is a linear relationship as shown in FIG. 3 in the above embodiment, it may be an exponential function or a square proportional relationship. Moreover, you may comprise the 1st determination means 15 and the 2nd determination means 16 of the said Example in hardware. Further, in the above-described embodiment, the determination of the downstream blockage and the downstream blockage cancellation in # 2 and # 5 of FIG. 4 is performed by the absolute value, but it may be performed by the relative value.

EFFECTS OF THE INVENTION As is apparent from the above description, the control device for an infusion pump according to the present invention, based on a signal from a sensor closely attached to a downstream side of an infusion operation portion of a tube to which a liquid is fed, causes a downstream blockage. Means for detecting and determining whether or not the downstream blockage has been released after having occurred once and automatically stopping the infusion operation, and information for informing the operator that restart is possible based on the determination. Equipped with transmission means. Therefore, the operator of the control device for an infusion pump according to the present invention can easily perform this operation if the downstream blockage state is released and restartable in the case of temporary downstream blockage or the like. You can know.

[Brief description of drawings]

FIG. 1 is a schematic view showing a partially enlarged embodiment of an infusion pump according to the present invention, and FIG. 2 is a block diagram showing an outline of a configuration of a main part of a controller for an infusion pump according to this embodiment. FIG. 3 is a diagram showing the relationship between the sensor output used in the infusion pump of the present embodiment and the outer diameter of the tube, and FIG. 4 is a flow chart showing the operation of the CPU of the present embodiment, FIG. 5, FIG. FIG. 7 and FIG. 8 are schematic diagrams showing an example of the information transmitting means of the infusion pump according to this embodiment. 1 ... Infusion bag, 2 ... Tube 3 ... Human body 4 ... Infusion actuation unit 5 ... Sensor 6 ... Microcomputer 7 ... Information transmission means 8, 9, 10 ... Interface 11 ... Liquid 12 ... CPU 13 ... Program ROM 14 ... Data RAM 15 ... First judging means 16 ... Second judging means

Claims (1)

[Claims] 1. An infusion pump including an infusion actuating unit, which injects into a human body from an infusion bag via a tube by a liquid feeding operation of the infusion actuating unit, wherein an internal pressure in a tube downstream of the infusion actuating unit is controlled. A sensor whose output level changes with changes and a tube internal pressure that is connected to the above sensor and is output from the sensor becomes larger than the judgment reference value of the occlusion stop condition value. And a control means having a second determination means for determining the downstream blockage release when the tube internal pressure becomes smaller than the determination reference value of the restart condition value after the infusion operation portion is stopped, And an information transmitting unit that is connected and displays the downstream blockage occurrence determination by the first determining unit and the downstream blockage release determination by the second determining unit. Infusion pump.