JPH07236692A - Transfusion pump - Google Patents

Abstract

PURPOSE:To provide a transfusion pump in which emptiness detecting time at the switching of a plurality of transfusion bags is changed to prevent an erroneous operation of emptiness detection. CONSTITUTION:A selected liquid housing vessel of the liquid to be transfused housed in a plurality of transfusion bags 14 is pressed by a tube 19, whereby the liquid to be transfused housed in the vessel is transfused at a set transfusion flow rate. When the emptiness of one transfusion bag 14 is detected, an automatic back switch 24 is operated, and the transfusion line can be surely automatically switched to the other liquid bag 14 without error.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump for infusing a liquid to be transported stored in a plurality of liquid storage containers. For example, a nutrient solution or a drug solution stored in a plurality of infusion bags can be continuously transferred to a living body. The present invention relates to an infusion pump that infuses for administration.

[0002]

2. Description of the Related Art For example, in the medical field, in order to administer a parenteral liquid such as a nutrient solution, a drug solution, and a saline solution into a living body, a medical infusion system for infusing these liquids is used. An example of this infusion system is shown in FIG.
It has an infusion bag 14 for storing a nutrient solution and the like, and an infusion pump 23 for infusing a nutrient solution and the like. This infusion pump 23
As disclosed in Japanese Patent Publication No. 61-55,393, a peristaltic (peritric finger) type infusion pump is known, and an infusion bag or the like is connected to the front surface of the main body 22. A tube mounting portion 20 to which the flexible tube 19 is mounted is provided. In this mounting part 20,
A pump unit 21 is provided for compressing and infusing the liquid passing through the tube 19 so that the crushing position of the liquid feeding tube 19 is sequentially moved by the peristaltic movement of the finger, and the door 16 facing the pump unit 21 is opened and closed. It is attached freely. A back plate 17 that presses the tube 19 with a predetermined pressure along the direction toward the pump portion 21 is provided on the inner surface 18 of the door that faces the pump portion 21. A spring 17 ′ is attached between the back plate 17 and the inner surface 18 of the door to urge an elastic force that pushes the back plate 17 toward the pump portion 21.

Since the pump portion 21 of the infusion pump 23 is driven by a stepping motor or the like, the flow rate per unit time (for example, one hour) can be set within a predetermined range by controlling the rotation speed of this motor. It has become. Further, since the infusion amount per one rotation of the pump drive shaft is known in advance, the infusion amount after the infusion is started can be calculated by counting the number of revolutions of the pump drive shaft. . Furthermore, the infusion pump 23
It also has a function to set the planned volume of infusion. Scheduled infusion volume,
If the flow rate of infusion is set, the infusion can be automatically performed for a long time (about 24 hours) while being detected by the liquid drop detection sensor 25.

In addition, this type of infusion pump 23 has a built-in infusion volume monitor for indicating that the infusion has been completed. The conventional infusion volume monitor monitors the number of revolutions of the pump drive shaft. By turning on the lamp or making a buzzer sound when the calculated infusion volume or the infusion volume calculated by counting the number of drops of drug solution etc. matches the preset infusion volume, It indicates that the infusion has been completed.

[0005]

However, in the case where a plurality of infusion bags are used for continuous infusion over a long period of time, as soon as one bag is emptied, the nurse will go to the nurse center and The line had to be changed to another infusion bag, and the infusion pump was frequently circulated, which was a burden for nursing.

Even if a device for detecting the empty liquid in one bag and automatically switching to the infusion line for the other bag is used, the empty liquid in the bag is removed depending on the time after the last drop is detected. The detection device has a problem that if the empty liquid is judged at the same time interval as when the infusion operation is started and the infusion line is switched, the switching timing is erroneously recognized.

The present invention has been made in order to improve the above-mentioned problems of the conventional peristaltic type and roller type infusion pumps equipped with an automatic bag changer. It is an object of the present invention to provide a switching infusion pump.

[0008]

According to the present invention for achieving the above object, one of the liquids to be transported contained in a plurality of liquid containers is selected and the tube is pressed to infuse the liquid. An infusion pump, comprising: a tube pressing means for compressing and infusing the liquid to be transported so as to sequentially move the crushing position of the liquid sending tube according to a set infusion flow rate, and driving the tube pressing means. A driving means including a motor for detecting the transport state of one of the transported liquids stored in the plurality of liquid storage containers, and an empty liquid detection of the transported liquid stored in the liquid storage container. Switching means for interlockingly switching the infusion line to the transported liquid stored in the other liquid storage container, and the switching means detects the first empty fluid and detects the empty fluid immediately after switching to the other infusion line. At first Compared to that the infusion pump, characterized in that switching with long empty liquid detection time.

[0009]

The transported liquid stored in the container by pressing the tube of the selected liquid storage container among the transported liquids stored in the plurality of liquid storage containers is infused at the set infusion rate. . When the empty liquid in one of the liquid storage containers is detected, the liquid is automatically and reliably switched to the infusion line of the other liquid storage container. Therefore, labor saving in nursing can be achieved in the continuous infusion operation.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A peristaltic type infusion pump according to an embodiment will be described in detail below with reference to the accompanying drawings. FIG. 2 is a front view of the peristaltic infusion pump 1 according to the present invention. Referring to FIG. 2, reference numeral 2 is a first display unit showing an LED or the like for informing an abnormality or the like of the peristaltic infusion pump 1, and when blockage of a tube attached to the peristaltic infusion pump 1 is detected, If the flow rate of the liquid in the tube attached to the infusion pump 1 is not within the predetermined set flow rate, or if there is no liquid in the tube attached to the peristaltic infusion pump 1, the door 12 of the peristaltic infusion pump 1 is opened. It is a display unit showing an abnormality such as a state where the liquid is completely closed or a state where the liquid is not completely closed, and a case where the infusion is completed. Each of these may be displayed separately as the display unit. Reference numeral 3 is a second display unit for digitally displaying the cumulative amount of infusion, the infusion flow rate, the expected infusion volume, and the like. The integrated amount is calculated by displaying the total infusion amount from the start of infusion to the present, from the flow rate per unit time based on a table stored in advance, and displaying this. 4 is a changeover switch for changing over the display of the flow rate and the planned amount on the second display section of 3.
Reference numeral 5 is an integration clear switch for clearing the integration amount, and 6 is a key for setting the number of droplets. Further, 7a is a rough adjustment key (two digits) for setting an infusion flow rate of an infusion (a unit time, for example, an infusion flow rate per hour), and an expected infusion rate, and 7b is an infusion rate of the infusion and an expected infusion rate. This is a fine adjustment key (1 digit) for each of the upper keys of 7a and 7b, and each digit is +10, +1 each time the key is pressed, and each digit of the lower key of 7a and 7b is -digit. 10, -1. When the flow rate setting is entered with the keys 7a and 7b, a pulse having a pulse frequency corresponding to the set flow rate is given to the motor drive circuit, and the rotation speed of the motor drive shaft is controlled. A power key 8 turns on / off the power of the infusion pump. When the power source is a battery, a message to that effect is displayed, and when the voltage drops below a predetermined value, it blinks. 9
Is infused at a predetermined flow rate while the fast forward key is being pressed. Reference numeral 10 is a key for starting and stopping infusion, which is also provided with a mute key function of an alarm buzzer. Reference numeral 11 is an opening / closing lever of the door 12, and 13 is a grip portion.

The second display section 3 is preferably composed of an LED or LCD display having seven segments. Alternatively, the LEDs may be arranged in a row, and a predetermined display may be indicated by turning the LEDs on, off, or blinking. Moreover, an error can be displayed using this segment. Further, various alarms may be identified by providing a buzzer for indicating an infusion completion report and the like, and making the buzzer sound an intermittent sound or a continuous sound. Further, the display unit 3 and the buzzer may be connected to a so-called nurse call system so that the nurse center can also display a predetermined display based on the calculation result. The medical infusion system shown in FIG. 3 is used when injecting a plurality of medicinal liquids (infusion liquid) into a living body or performing automatic drip, and the infusion bag 14 containing the medicinal liquid and the infusion liquid. It has an automatic bag changer 24 for switching lines, a liquid drop detection sensor 25 for detecting empty liquid medicine in an infusion bag, and a peristaltic infusion pump 1. Inner surface 1 of the door facing the pump unit 21
8 is provided with a back plate 17 that presses the tube 19 along a direction toward the peristaltic pump portion 21. Between the back plate 17 and the inner surface of the door, a biasing member 17 'such as a spring for biasing an elastic force that presses the back plate 17 toward the peristaltic pump portion 21 with a predetermined pressing force is attached. ing. Further, the peristaltic pump portion 21 is covered with a waterproof sheet member 21 'to prevent the chemical solution from entering the peristaltic pump portion.

The infusion bag 14 is filled with a predetermined amount of a parenteral liquid (equivalent to a liquid to be transported) such as a nutrient solution and a physiological saline solution, and is locked on an upper portion of a stand (not shown). . To the lower end of the infusion bag 14, an infusion set (Y-tube) 26, which is made for continuously switching and using a plurality of infusion bags, is connected. Infusion set 26
Is connected to one end of the flexible tube 19 via a drip tube 27. The infusion bag 14 is provided in the drip tube 27.
Drop sensor 2 for detecting drops of chemicals falling from the
5 is provided. The droplet detection sensor 25 is the optical sensor 2
The optical sensor 28 is composed of a light emitting element (for example, infrared LED) 28a and a light receiving element (for example, phototransistor) 28b, and is provided so that the light from the light emitting element 28a is blocked by the dropped droplets. There is. As the liquid medicine drops from the infusion bag 14, the light emitting element 2
Since the light from 8a is blocked or passes by the dropped droplet, the light receiving element 28b outputs, for example, an OFF signal when receiving the light from the light emitting element 28a, and it is set in advance that the light is blocked by the droplet. An ON signal below the threshold value is output. By counting this ON signal, the number of drops of the drug solution or the like is detected. Then, the drop interval in the infusion bag can be detected when the drop interval is measured to measure that it is longer than the normal drop interval. In addition, the drip cylinder 27 has 1 cc for 15 drops,
The number of drops per unit volume (for example, 1 cc) is predetermined such that 19 drops are 1 cc and 60 drops are 1 cc. Therefore, the infusion solution integrated amount can be calculated by counting the number of drops of the drug solution or the like, that is, the ON signal from the light receiving element 28, and integrating or dividing this by the number of drops per unit volume. This integrated amount is displayed on the second display unit.

If the drop of the chemical solution is not sensed even after a lapse of a predetermined time, that is, if the ON signal from the light receiving element 28b is not detected within the predetermined time, one of the infusion bags stored in the infusion bag 14 is detected. You can determine that one is empty. When it is determined that the liquid is empty, the liquid is transferred to a line which is connected to the upper part of the drip tube and which is different from the infusion line which detects the empty by driving the motor or solenoid of the automatic bag switching device 24. At this time, the infusion line may be closed by a method using the motor and the cam, or by directly closing the tube by using a solenoid or the like. By using such a system, it is possible to automatically and continuously inject a plurality of infusion agents without the help of a nurse, and it is possible to save labor in nursing.

FIGS. 5 and 6 are a perspective view and a perspective sectional view of the bag switching device of this embodiment, and FIG. 7 is a sectional view of the tube pressure closing portion of the bag switching device by the cam of this embodiment.
The connector 29 is connected to the rear surface of the body of the infusion pump, and a cam 30 for compressing and closing the tube and a motor 31 for driving the same are arranged as shown in the figure. A switch 32 (for example, a micro switch or the like) for detecting the home position of the cam is incorporated in the center of the cam, and the motor is rotated to surely press and close the tube to move the finger 33.

Although only two lines are switched in the present embodiment, it is possible to expand the operation to a plurality of lines for operation, and as described above, a method of directly closing the infusion line such as a solenoid may be adopted.

As is well known, the stepping motor can control the rotation speed of the motor drive shaft by controlling the pulse frequency of the pulse applied to the motor drive circuit. Therefore, the peristaltic pump unit is configured to set the infusion flow rate per unit time within a predetermined range by controlling the frequency of the pulse given to the stepping motor.

Next, the operation of the infusion pump 2 will be described with reference to the flow charts shown in FIGS. 2 and 8 and the block diagram shown in FIG.

When the program is started, various variables are initialized, the changeover switch 4 is switched to input of the planned infusion amount, and the planned infusion amount Q is set by the setting key 7 in the key input section 38.
a, 7b, which is stored in the storage unit 36,
Is displayed on the display unit 3 (step S1). Next, the previous term changeover switch 4 is used to switch to the infusion flow rate input, and the infusion flow rate V is set by the setting keys 7a and 7b in the key input section 38, which is also stored in the storage section 36 and displayed on the first display section 3. (Step S2). At this time, when the set flow rate and the number of drops of the infusion set to be used are determined, the dropping interval time of the drops is calculated, and the time used for the initial detection (first time) of the empty liquid (for example, the time equivalent to 8 drops) and the second time The time used for subsequent empty liquid detection (for example, the time corresponding to 25 drops) is stored in the storage unit 36.

When the switch 10 is operated and the start of infusion is instructed by the output from the controller 39 (step S3),
The buzzer / nurse call output unit 40 indicating the start of infusion sounds, and a pulse having a pulse frequency according to the infusion flow rate V set in step S2 is given to the motor drive circuit (step S4), and the rotation speed of the motor drive shaft is increased. Is the storage unit 3
6 and the control unit 39, the peristaltic pump unit 21 is driven by the rotation of the motor 41 via the timing belt 43, and the tube 19 is sequentially pressed.
Infusion is started at a desired infusion rate from 4 (step S
5).

Normally, the drip signal from the liquid drop sensor 25 is compared with the target drip interval (step S
6) The control unit 39 controls the motor speed so that the drip interval corresponds to the set infusion flow rate V.
The various sensors 35 detect air bubbles in the tube 19, detect the open state of the door, detect a voltage drop, etc. When these occur, the motor is immediately stopped and the buzzer nurse call 40 or the like is activated. Output is performed (steps S7, S8, S9).

The power supply unit 34 is the entire power supply unit of the peristaltic infusion pump, and may be a battery such as a nickel-cadmium battery that can be charged from an external power supply. By adopting a rechargeable type, safety is improved by providing automatic switching means for power supply from the battery in case of power failure. Also car D
By using a C battery, it can be easily used as a power source even in ambulances.

When it is determined that the infusion total amount i has reached the expected infusion amount Q and the infusion has been completed, the infusion completion alarm is also shown to the operator or the like by lighting a lamp or emitting a buzzer sound.

When one of the liquid containers (infusion bag) 14 currently infused is exhausted during the infusion operation, one drop is recognized within the time determined in step S2. As a result, the control unit 39 recognizes the empty liquid in the infusion bag. At this time, if the automatic bag changer is connected, the empty liquid display section of the first display unit 2 is not turned on, the automatic bag changer is operated, and the infusion solution is switched to the other non-empty line (step S11). ). At this time, if the Y-shaped tube 26 as shown in FIG. 3 is used, the infusion agent does not reach the drip tube as shown in FIG. 4 (A is the preceding infusion, B is the subsequent infusion agent) at the time of switching. If the same empty liquid determination time as the initially calculated time was used, the empty liquid would be recognized again immediately after switching the infusion line, and the empty liquid line would be switched again. Occurs.

However, if the empty liquid recognition time immediately after the switching is made longer than a predetermined time compared to the initial time (first time), the empty liquid is erroneously detected immediately after the switching and the automatic bag changer is operated again to switch the bag. The above-mentioned problems can be solved. Here, the initial empty liquid detection before switching is set to a time equivalent to eight drops, and immediately after the empty liquid is recognized and switched by the automatic bag switching device, the empty liquid detection time is set to 25
By changing the time corresponding to the drop, it was possible to prevent the switching malfunction due to the misrecognition immediately after the switching. By adopting a system for continuously administering an infusion solution in this manner, the nurse does not have to frequently set an infusion solution to be administered next each time one bag is finished,
It is possible to save a lot of labor in nursing.

In addition, although the example applied to the peristaltic type infusion pump is shown in the embodiment, it can be applied not only to the infusion pump but also to all systems for administering the infusion.

[0026]

A transfusion pump for selecting and transfusing one of the liquids to be transported contained in a plurality of liquid storage containers, wherein the liquid to be transported is fed in accordance with a set infusion rate. Of the liquid to be transported contained in the plurality of liquid storage containers, a tube pressing means for compressing and transfusing the liquid so that the crushing positions of the liquid are sequentially moved, a driving means including a motor for driving the tube pressing means. Means for detecting one of the transportation states in the liquid storage container, and for switching the infusion line to the transported liquid stored in the other liquid storage container in conjunction with the detection of the empty liquid of the transported liquid stored in the liquid storage container. By providing the switching means, it is possible to continuously administer the infusion agent without bothering nursing, and the switching means detects the first empty fluid and switches to the other infusion line for the second time. In the subsequent empty liquid detection Since the switching is performed using an empty liquid detection time different from the initial time, we provide an infusion pump that can safely and continuously infuse without causing the automatic bag switching device to malfunction due to empty liquid misrecognition immediately after bag switching. can do.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an infusion system using an infusion pump.

FIG. 2 is a front view of a peristaltic type infusion pump according to the present invention.

FIG. 3 is a schematic configuration diagram showing a system using an automatic bag switching device.

FIG. 4 is a diagram showing a state immediately after bag switching in a system using an automatic bag switching device.

FIG. 5 is a perspective view of an automatic bag switching device.

FIG. 6 is a perspective sectional view of an automatic bag switching device.

FIG. 7 is a cross-sectional view of a tube closed state by a cam of the automatic bag switching device.

FIG. 8 is a flowchart showing an operation procedure of an infusion operation.

FIG. 9 is a block diagram showing a processing circuit of this embodiment.

[Explanation of symbols]

 1, 23 ... Infusion pump (infusion means) 14 ... Infusion bag (supply source) 24 ... Automatic bag switching machine 25 ... Droplet detection sensor 26 ... Infusion set (Y-tube)

Claims (1)

[Claims] 1. A transfusion pump for selecting and transfusing one of liquids to be transported contained in a plurality of liquid storage containers, wherein the liquid to be transported is fed in accordance with a set transfusion flow rate. Of the liquid to be transported stored in a plurality of liquid storage containers, a tube pressing means for compressing and injecting liquid so as to sequentially move the crushing position of the liquid, a driving means including a motor for driving the tube pressing means, A means for detecting one of the transportation states in the liquid storage container, and a switching means for switching the infusion line to the transported liquid stored in the other liquid storage container in conjunction with the detection of the empty liquid of the transported liquid stored in the liquid storage container. Switching means, and the switching means, when detecting the empty liquid immediately after the first empty liquid is detected and switched to the other infusion line, are switched by using a longer empty liquid detection time than the initial time. pump.