JP3055131B2 - Liquid level detector for drip containers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting the level of a drip container for detecting the end of infusion by drip or the time of replacement of the drip container.

[0002]

2. Description of the Related Art Generally, in order to supply a drug solution or the like from a container to a living body through a tube, a drip tube, an infusion tube,
An infusion set including a clamp, an injection needle, and the like is used. When an infusion tube is inserted into an infusion container, a drug solution or the like in the infusion container drops into the infusion tube, and is infused through an infusion tube. Such a drip injection device is provided with a liquid level detection device that automatically detects a drop in the liquid level in the drip container.
As disclosed in Japanese Unexamined Patent Application Publication No. 63-160670 and Japanese Patent Application Laid-Open No. Sho 63-160670, a light projecting means and a light receiving means are mounted in pairs on the lower side of the drip container, and the change in the infusion amount in the drip container is detected by the light receiving means When the infusion amount reaches a predetermined value or less, an alarm device such as a buzzer sounds immediately at a nurse center to notify the end state of the infusion and the replacement time of the drip container.

[0003]

In the prior art described above, the nurse in charge is not present at the nurse center when, for example, the patient is moving to another place despite the time to replace the drip container. In this case, the patient is left empty until the nurse returns to the nurse center and confirms the alarm sound, or the patient or another person directly checks the IV container. In addition, when such a state continues for a long time, the backflow of blood or the intrusion of air into the infusion set occurs, and the infusion route is easily blocked.

[0004] Therefore, there have been proposed various liquid level detecting devices for a drip container, which enable the nurse in charge to know the replacement time of the drip container at any place.

Japanese Utility Model Application No. 54-34892 (Japanese Utility Model Application Laid-Open No. 55-55)
No. 134843), the microfilm is provided with a sensor having an optical system detecting device for an infusion tube (4) suspended below the infusion container (2) to reduce the amount of infusion passing through the infusion tube (4). An infusion wireless information device transmitting by a wireless transmission unit is disclosed. However, this device detects that an infusion passing through an infusion tube (4) suspended below an infusion container (2) is below a predetermined position, and detects an infusion flowing through the infusion tube (4). Since the volume is small, there is no time margin between the transmission of the decrease in the infusion volume and the replacement of the infusion, and the exchange of the infusion is practically impossible in time.

In Japanese Patent Application Laid-Open No. 57-29364, a drip tube 6, a drip tube 5, and a drip tube 7 are sequentially provided below an infusion bottle 3 in which an infusion 4 is stored. A drip set, in which detection electrodes 1 and 1 are attached so as to communicate with the input cable 11 and an input cable 11 connected to a detection signal input terminal 10 of the transmitter 2 is connected to a portion of the electrodes 1 and 1 protruding outside the drip tube 6 An infusion reduction automatic notification system is disclosed.
However, in this system, since the detection electrode is provided in the drip tube 6 below the infusion bottle 3, when there is no infusion in the drip tube 6, the conduction between the detection electrodes 1 and 1 is lost, and the transmitter 2 is connected. Radio waves will be emitted, but the amount of infusion remaining after the infusion tube 6 is no longer infused is small, so there is not enough time from the transmission indicating the decrease in infusion amount to the replacement of infusion. Infusion change is not always in time.

Further, Japanese Patent Application Laid-Open No. 61-196964 discloses a drip operation detecting unit 7 comprising a light emitting device 5 and a light receiving device 6 in a transparent glass reservoir pipe 4 provided in a drip passage of an infusion device 1. The drip operation detecting section 7 is provided with a counter 8 for counting the number of the detected drip.
The count output of the counter 8 is supplied to an input unit of a comparator 9. If the number of detected infusions is abnormal due to a signal from a preset unit 10 connected to the comparator 9, an abnormality is transmitted from the transmitting unit 12 via the synthesizer 11. A transmitting infusion monitoring system is disclosed. However, this system is for detecting and stopping an abnormality in the drip when it occurs, and not for notifying that the drip is gone. In addition, since the drip operation detecting unit 7 serving as a sensor is attached to the reservoir pipe 4, there is a problem that it is not possible to cope with a different shape of the reservoir pipe 4. Also, in this apparatus, when the drip is no longer used, there is only a liquid in the liquid reservoir pipe 4 and the chemical supply tube 14, so that there is no time margin until the replacement of the drip.

Further, the microfilm of Japanese Utility Model Application No. 60-115681 (Japanese Utility Model Application Laid-Open No. 62-24837) has an optical sensor 3 equipped with a transmitter 2 about 1 cm above the supply port 1 of the drip container A. When the remaining liquid in the drip container A falls below the position of the optical sensor 3 due to the mounting and the supply of the drip liquid, the optical sensor 3 is activated and the transmitter 2 notifies the receiver 4 of the drip notification device. ing.
With this device, it is possible to make a notification in the state where the drip liquid remains in the drip container A to some extent, but it is necessary to adjust the position of the optical sensor 3 every time the drip container A is different. When an infusion container is set as it is and an infusion is performed, the shape of the container is irregular and the infusion liquid may not be detected accurately.
In addition, since the transmitter 2 and the receiver 4 are provided for each optical sensor 3, a nurse in charge of a plurality of hospital rooms must always carry the receivers 4 corresponding to the number of the infusion containers A. When the number of receivers 4 increases as the number of hospital rooms and nurses increases, the number of optical sensors 3 increases.
Are activated at the same time, it is not possible to know which optical sensor 3 is activated and the receiver is making a notification, and the nurse cannot promptly perform an appropriate replacement procedure.

In the microfilm of Japanese Utility Model Application No. Sho 62-120524 (Japanese Utility Model Application Laid-Open No. 64-26043), the photoelectric sensing clamp body 3 is placed at an appropriate position below the liquid level in the IV SET drip detecting bottle 5. When sandwiched and mounted, when the liquid infusion is finished flowing and the liquid level in the IV SET drip detection bottle 5 drops and becomes lower than the set surface of the photoelectric sensing clamp body 3, it is possible to directly irradiate the sensing body 41. A photoelectric sensing drip alarm device that sounds a buzzer in a nurse's room by a connecting line is disclosed. However, the IV SET drip detection bottle 5 here is formed in a cylindrical shape, and even when the bottle is filled with a drip solution, a light beam is applied to the IV SET drip detection bottle 5.
, The difference in the amount of light received by the sensor 41 does not appear so significantly depending on the presence or absence of the infusion solution, and the reliability of detection cannot be improved. When a detection signal is output from the sensor 41, a buzzer in the nurse's room sounds, and this buzzer is provided with a plurality of sensors 41,6.
In this case, it is not possible to accurately know in which room the drip bottle 7 should be replaced, and the nurse cannot promptly perform an appropriate replacement procedure. Furthermore, when there is no nurse in the nurse's room, there is a concern that the nurse is left as it is until returning to the nurse's room and confirming the sound of the buzzer.

Therefore, the present invention solves the above-mentioned problems, and can cope with various types of infusion containers. There is no waste of chemicals and the like. In addition to being able to know exactly with sufficient room, the reliability of the detection by the liquid level sensor is high, and it is possible to replace the patient in each room quickly and reliably without being affected by the size of the hospital, such as the number of rooms and nurses. It is an object of the present invention to provide a liquid level detecting device for a drip container capable of performing a treatment.

[0011]

According to the present invention, there is provided an object to be detected having a drip passage for transporting a medicinal solution or the like in a drip container, wherein the medicinal solution or the like is accommodated and an engaging portion corresponding to the level of the medicinal solution or the like is formed. Disposed, a sensor holding portion having an engagement receiving portion engageable with the engagement portion is fixedly attached to the detection object, the detection object is transparent and at least one side is formed in a square shape, A liquid level comprising light projecting means and light receiving means for detecting a drop in the liquid level in the object so that the optical axis when the object is empty is coincident through both surfaces forming one side of the object. A controller for monitoring the state of the liquid level sensor provided in each of the sickrooms while providing a sensor in the sensor holding unit; and when a detection signal is output from the liquid level sensor to the controller, nursing of the corresponding sickroom is performed. Sending a calling signal to the receiving means carried by the woman Means, and a notification unit having a plurality of indicators which are turned on in response to a detection signal based on the liquid level sensor in each hospital room, wherein the controller centrally controls a plurality of transmission means and reception means. .

[0012]

With the above arrangement, the liquid level sensor provided on the detection object detects a drop in the liquid level of the drip container, and when it is time to replace the drip container, the transmission means of the wireless control device transmits the drip container via the corresponding reception means. To make a notification.

At this time, the liquid level sensor adjusts the mounting angle of the liquid level sensor and the like every time the drip container is replaced, in order to detect a drop in the liquid level in the detection object disposed in the drip flow path. It is not necessary to carry out, and it becomes possible to correspond to all types of infusion containers. In addition, since the detection target can store a certain amount of a drug solution or the like separately from the drip container, the drip container can be replaced when the drip container is completely empty, and waste of the drug solution and the like can be achieved. In addition, since the detection signal is output from the liquid level sensor in a state where the liquid medicine or the like remains on the detection target, it is not necessary to replace the drip container in a hurry and the anxiety of the patient is eliminated. In particular, the position of the sensor to be attached to the object to be detected can be adjusted by selecting the engaging portion according to the liquid level of the medical solution of the detecting body that contains the medical solution or the like and mounting and fixing the sensor holding portion. Since the remaining amount of the chemical solution or the like to be notified can be made a desired value,
It is possible to secure a sufficient time for replacing the drip container even after receiving the notification according to the drip speed and type of the drip, and the skill of the person who replaces the drip.

The object to be detected is transparent and one side is formed in a square shape, and the light projected by the liquid level sensor is passed through both surfaces forming the one side so that the optical axis in the empty state of the object coincides. Means and the light receiving means are provided, so that when the object to be detected is filled with a chemical solution or the like, light from the light projecting means is reflected on one side surface of the object by the lens action of the chemical solution or the like. On the other hand, in the empty liquid state, the light from the light projecting means reaches the light receiving means with little refraction or reflection. For this reason, the difference in the amount of received light reaching the light receiving means appears remarkably, and the reliability of detection by the liquid level sensor can be improved.

Further, when a detection signal is output from the liquid level sensor to the controller, a calling signal is emitted to the receiving means carried by the nurse in the corresponding hospital room. Exchange time can be known. At the same time, the notification unit is activated and the indicator of the corresponding sickroom is turned on. Can be accurately determined. In addition, since the pharmacist can prepare an infusion container in the corresponding hospital room in advance based on the display of the notification unit, the nurse returning to the nurse center or the like receives the infusion container and promptly replaces it appropriately. Action can be taken.

In addition, since the controller can centrally control the plurality of transmitting means and the transmitting means, even when, for example, detection signals are simultaneously output from the liquid level sensors in a plurality of hospital rooms, the controller can control the transmitting means. It is possible to emit a calling signal to the receiving means of the nurse in charge via the terminal to notify each nurse of the time for replacing the drip container. Therefore, coupled with the high reliability of the detection by the liquid level sensor, the exchange treatment in each hospital room can be performed reliably and quickly without being affected by the number of hospital rooms and the number of nurses.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 5 show a first embodiment of the present invention,
As shown in the schematic explanatory view of FIG. 1, a guide rail 3 is provided on a ceiling 2 of a hospital room 1.
The moving body 4 is provided so as to be slidable along. Reference numeral 5 denotes a suspender attached to the moving body 4, and the suspender 5 has a chemical A
Transparent synthetic resin bag type drip container 6 containing
Are exchangeably suspended. A well-known infusion set including an infusion tube 7, an infusion tube 8, a clamp 9, an injection needle 10, and the like is connected to the infusion container 6, and the medicinal solution A and the like in the infusion container 6 are supplied to a living body. In the middle of the infusion tube 8, a transparent tubular detection body 12 having one side 11 formed at 90 ° is provided so as to be fixed to the upper part of the drip tube 7. Reference numeral 13 denotes a sensor holding portion formed in a U-shape. The sensor holding portion 13 is attached and fixed so as to be movable in the vertical direction with respect to the detection target 12, and is provided on both sides of the sensor holding portion 13. The optical axis 14 in a state where the detection object 12 is empty has both sides 11 forming one side 11 of the detection object 12.
A liquid level sensor 15 comprising a light projecting means 15A and a light receiving means 15B, which constitutes a transmission type photoelectric sensor so as to coincide with each other through A and 11B, is provided. Further, an amplifier unit 16 is connected to the liquid level sensor 15 via an electric cord 17,
This amplifier unit 16 is provided with a sensitivity adjustment volume (not shown), a check pin for optical axis adjustment, an operation indicator, a stability indicator, and the like. Notification unit installed near
It is connected to 19 and supplies an output signal of the liquid level sensor 15 to the outside. The notification unit 19 is provided with one display lamp 20 and one buzzer 21.

FIG. 2 is a schematic explanatory view of the whole liquid level detecting device in the present embodiment. In the figure, reference numeral 22 denotes a contact calling device connected to the electric cord 17 and including switch means such as a relay, for example. This contact calling device 22
By connecting the electric cords 17 from a plurality of rooms 1 to each room 1
The state of the contact of the switch means can be switched based on the presence or absence of the output signal from the liquid level sensor 15. Reference numeral 23 denotes each hospital room 1 via the contact calling device 22.
The encoder 23 is a controller that monitors the state of the liquid level sensor 15 of the liquid crystal display.
And a receiver 25 which is a receiving means such as a pager which is remotely controlled by the transmitter 24, constitutes a wireless controller 26. The encoder 23 is provided with an operation unit 27 having ten keys and function keys for setting various operation states such as time setting on the front surface thereof.
An LCD display unit 28 is disposed above the LCD. Further, this encoder 23 can connect up to five transmitters 24. Particularly, when the number of rooms in the hospital room 1 is large, by using an expansion unit (not shown), more transmitters 24 and The receiver 25 can be centrally controlled. The encoder 23 is connected to a notification unit 30 provided in a nurse center 29. The notification unit 30 is provided with a plurality of display lamps 31 corresponding to each of the sickrooms 1 to respond to an output signal based on the liquid level sensor 15. The display lamp 31 lights up. Further, the display lamps 20 are linked to the corresponding display lamps 31 of the notification unit 30.

FIG. 3 shows a liquid level detecting unit, and a scale for indicating the remaining amount of a chemical solution or the like is provided on one side surface 11A of the detection object 12 provided between the drip tube 7 and the infusion tube 8. A part 32 is formed, and an air valve 33
Are formed. Further, both ends 34A, 34
B is provided with a plurality of pairs of convex pieces 35A and 35B, which are engaging portions. One of the convex pieces 35A and 35B is engaged with the concave groove 36 of the sensor holding portion 13 as an engagement receiving portion. When the sensor holding unit 13 is attached to the body of the detection target 12 while performing the above operation, the light projecting means 15 of the liquid level sensor 15 embedded in the inner surface of the sensor holding unit 13
A and the light receiving means 15B are provided on both sides 11A, 11B of the detection object 12.
And face each other at the position sandwiching. At this time, the detected object
In a state where 12 is empty, the optical axes 14 of the light projecting means 15A and the light receiving means 15B coincide with each other, and the both surfaces 11A and 11B of the detection object 12 are connected through the through holes 37 provided on the inner surface of the sensor holding unit 13. It is going to pass. In addition, the power cord 17 is
13 from the lower surface.

Next, the operation of the above configuration will be described. At the time of infusion by drip, a transparent drip container 6 containing a transparent drug solution A or the like is hung on
The sensor holding portion 13 is attached and fixed to the detection target 12 while engaging one of the positions A and 35B with the concave groove 36. At this time, when the concave groove 36 is engaged with the uppermost convex pieces 35A and 35B, the liquid level sensor 15 detects that the remaining amount of the chemical solution A or the like is 25C.
C is set to a drip end state for detecting whether or not the liquid has reached C or a liquid level position corresponding to the drip container replacement time. Hereinafter, the engagement position between the convex pieces 35A, 35B and the concave groove 36 is moved downward while moving. As the sensor holding portion 13 is attached and fixed to the detection target 12, the liquid level sensor 15
It is set to the liquid level position for detecting whether CC or 5CC has been reached. On the other hand, the receiver 25 is carried by each nurse, and when the time for replacing the drip container 6 is reached, the calling signal is emitted only to the receiver 25 of the nurse in the hospital room 1 in charge. Initial setting is performed by the operation unit 27 of 23.

In this state, when the power supply (not shown) is turned on to start the infusion, the operation of turning on the power turns on the light emitting means.
15A emits light. At this time, as shown in FIG.
In a state in which the chemical solution A or the like is filled in the inside 12, the light emitting means 15
The light from A is detected by the lens action of the chemical A
Since the light is reflected on one side surface 11A of the device 12, the amount of light reaching the light receiving means 15B is lower than a predetermined level, and the detection signal is not output to the contact calling device 22. On the other hand, the infusion proceeds,
When the liquid level of the liquid medicine A in the liquid crystal 12 falls below the optical axis 14, the light from the light projecting means 15A becomes empty as shown in FIG. One side 11
A, the light passes through the detection object 12 and one side surface 11B in order, and reaches the light receiving means 15B with little refraction or reflection.
It is output to the encoder 23 via 22. Encoder 23
Transmits a calling signal from the transmitter 24 to the corresponding receiver 25, and the receiver 25 emits a predetermined ringing sound, so that the nurse in charge of the sickroom 1 knows the time of replacement of the drip container 6. be able to. At the same time, based on this detection signal, the notification unit provided in the nurse center 29
30 is activated, the display lamp 31 of the corresponding sickroom 1 is turned on, and the notification unit 19 provided on the bed 18 is activated. Then, the nurse center 29 responds to the ringing tone of the receiver 25.
The nurse, who has returned to the hospital, confirms in the sickroom 1 that the subject 12 in the sickroom 1 is empty by the notification unit 30, receives a new drip container 6 from the pharmacist, and terminates the infusion in the sickroom 1. Alternatively, the drip container 6 can be replaced. In addition, since the detection target 12 itself can contain the chemical solution A, the drip container 6 can be replaced while the drip container 6 is completely empty, so that the chemical solution A is not wasted.

As described above, in this embodiment, when the infusion proceeds, the liquid level of the chemical solution A in the detection target 12 decreases, and the liquid level sensor 15 detects the replacement time of the drip container 6, The encoder 23 of the wireless control device 26 connected to the liquid level sensor 15 emits a transmission signal to the receiver 25 carried by the nurse in the corresponding sickroom 1 via the transmitter 24, whereby Even if the nurse is moving outside the nurse center 19, it is possible to reliably know that the IV container 6 must be replaced in the hospital room 1 in charge,
The danger of leaving the patient empty in the drip container is avoided. Moreover, at the Nurse Center 19, the notification unit
Since the pharmacist can prepare the drip container 6 of the corresponding sickroom 1 in advance based on the 30 display lamps 31, the receiver
The nurse returned to the nurse center 19 with 25 dial tone,
Upon receiving the infusion container 6, it becomes possible to immediately perform an appropriate replacement treatment in the hospital room 1. At this time, in the present embodiment, the detection target 12 has a capacity of a drug solution or the like of 30 CC or more, and the position for holding the sensor holding unit 13 is set to a plurality of convex pieces 35A according to the type of infusion and the dropping speed. 35B
Therefore, even after the drip container 6 is emptied and the liquid solution A in the detection target 12 becomes smaller than a predetermined amount and the liquid level sensor 15 detects this and emits a calling signal, Sufficient time for replacing the drip container 6 can be secured.

The object 12 to be detected is transparent and one side is formed in a square shape. Through both surfaces 11A and 11B forming the one side, the optical axis 14 when the object to be detected 12 is empty is coincident with each other. Since the light projecting means 15A and the light receiving means 15B of the liquid level sensor 15 are provided, when the detection target 12 is filled with the chemical solution A, the light from the light emitting means 15A is received by the lens action of the chemical solution A. While the light is reflected on one side surface of the detection body 12, the light from the light projecting means 15A reaches the light receiving means 15B with little refraction or reflection in the empty liquid state. For this reason, the difference in the amount of received light reaching the light receiving means 15B appears remarkably,
The reliability of detection by the liquid level sensor 13 can be improved.

Further, the radio controller 26 includes a plurality of transmitters 24
In addition, since the receiver 25 can be centrally controlled, even when, for example, a detection signal is simultaneously output from the liquid level sensors in a plurality of sickrooms 1, the encoder 23 receives the signal from the nurse in charge via the transmitter 24. It is possible to notify each nurse of the time of replacement of the drip container 6 by transmitting a transmission signal to each of the devices 25, and to be sure and independent of the hospital room, such as the number of hospital rooms 1 and the number of nurses. The exchange treatment in each hospital room 1 is quickly performed.

FIG. 6 shows a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. In the present embodiment, the sensor holding unit 41
Is a slide piece 42 as an engagement portion and an engagement groove as an engagement receiving portion.
43 movably fixedly attached to an arbitrary position in the vertical direction with respect to the detected body 44 by, and to show how the notification unit 19 and the notification section 21 to become advance how much of the remaining amount is activated, the sensor A window portion 45 is formed in the holding portion 41, and score lines 46 are provided on both sides of the window portion 45. Then, for example, by matching the ruled line 46 with “25” of the scale portion 47, the liquid level sensor 15 including the light projecting unit 15A and the light receiving unit 15B provided on the inner surface on the back side of the detected object 44 A detection signal is output when the remaining amount of the liquid medicine 33 and the like in the storage tank 42 reaches 25 CC, whereby the same effects and functions as those of the first embodiment are obtained.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, the shape and structure of the liquid level sensor are not limited to each embodiment in the present invention, and can be appropriately changed. In addition, the drug solution and the like include physiological salt, nutrients, blood, and the like in addition to the drug solution.

[0027]

According to the present invention, an object to be detected is provided in which a chemical solution or the like is accommodated in a drip flow path for transporting the chemical solution or the like in a drip container and an engaging portion corresponding to the liquid level of the chemical solution or the like is formed. A sensor holding portion having an engagement receiving portion engageable with the engagement portion is attached and fixed to the detected object, the detected object is transparent and at least one side is formed in a square shape, and the detected object is A liquid level sensor comprising a light projecting means and a light receiving means for detecting a drop in the liquid level in the object so that the optical axis in the empty state coincides through both surfaces forming one side of the object. A controller provided in the holding unit and monitoring the state of the liquid level sensor provided in each room, and when a detection signal is output from the liquid level sensor to the controller, a nurse in the corresponding room carries the controller. Transmitting means for emitting a calling signal to the receiving means, and A notification unit having a plurality of indicators that are turned on in response to a detection signal based on the liquid level sensor, wherein the controller centrally controls a plurality of transmission units and reception units, It is compatible with various types of drip containers, there is no waste of chemicals, etc., and even if the nurse in charge is in any place, it is possible to know the replacement time of the drip container with sufficient time and to know the liquid level. Provided is a drip-container liquid level detection device which has high reliability of detection by a sensor and can perform a replacement procedure in each hospital room reliably and quickly without being affected by the size of the hospital, such as the number of hospital rooms and nurses. can do. Moreover, according to this device, the remaining amount of the chemical solution or the like to be notified can be made a desired amount, so that it is possible to secure sufficient time for replacing the drip container even after receiving the notification.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory diagram of a hospital room showing a first embodiment of the present invention.

FIG. 2 is a schematic explanatory diagram of the whole of the same.

FIG. 3 is a perspective view of a main part of the same.

FIG. 4 is an explanatory diagram showing a case where a detection target is filled with a chemical solution or the like.

FIG. 5 is an explanatory diagram showing a case where the detection target is in an empty liquid state;

FIG. 6 is a perspective view showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Hospital room 6 Infusion containers 11A, 11B Both sides 12 Detected object 13 Sensor holding unit 14 Optical axis 15 Liquid level sensor 15A Light emitting means 15B Light receiving means 23 Encoder (controller) 24 Transmitter (transmitting means) 25 Receiver (receiving means) ) 30 Notification unit 31 Indicator lamp (Indicator) 35A, 35B Convex piece (engagement part) 36 Depressed groove (engagement reception part) 42 Slide piece (engagement part) 43 Engagement groove (engagement reception part) A Chemical liquid

Claims (1)

(57) [Claims] An object to be detected is provided in which a medical fluid or the like is accommodated in a drip flow path for transporting a medical fluid or the like in a drip container and an engagement portion corresponding to a liquid level of the medical fluid or the like is formed. A sensor holding portion having an engagement receiving portion engageable with the engagement portion is attached to and fixed to the body, the object to be detected is transparent and at least one side is formed in a rectangular shape, and the object to be detected is empty A liquid level sensor comprising a light projecting means and a light receiving means for detecting a drop in the liquid level in the detected body so that the optical axis of the sensor body coincides with both sides forming one side of the detected body. A controller for monitoring the state of the liquid level sensor provided in each sickroom, and a receiving means carried by a nurse in the corresponding sickroom when a detection signal is output from the liquid level sensor to the controller. Transmitting means for emitting a call signal, and the liquid in each room A notification unit including a plurality of indicators that are turned on in response to a detection signal based on the position sensor,
The liquid level detecting device for an infusion container, wherein the controller performs centralized control of a plurality of transmitting means and receiving means.