JPH06218055A - Dripping detector - Google Patents

Abstract

PURPOSE:To provide a dripping detector with high detection accuracy which is free from effect of interception of light by liquid particles adhering to an internal wall of a dripping cylinder, color of transfusion, disturbing light, the type of the shape of the dripping cylinder or mounting attitude. CONSTITUTION:A closed space 38 formed by an elastic film 34 in contact with a second transfusion tube 18 is made to communicate with a condenser microphone 42 and air vibration with a relatively low frequency to be generated with the dropping of liquid drops is transmitted to the condenser microphone 42 ideally through the elastic film 34 with a contact area large sufficiently and the closed space 38. This achieves not only higher detection accuracy of dripping but also an elimination of effect of interception of light owing to liquid particles adhering to the internal wall of a dripping cylinder, color of transfusion, disturbed light, the shape of the dripping cylinder or mounting attitude. Moreover, there is no need for making a mounting so that a dropping locus of liquid drops in the dipping cylinder crosses an optical path from a light emitting element to a photodetecting element. This eliminates the need for skill in mounting, thereby, achieving mounting work in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drip detecting device for detecting a drop of a liquid drop in a drip tube in a liquid drop device.

[0002]

2. Description of the Related Art In the medical field and the like, a nutrient solution, blood, drug solution or the like may be infused into a living body. In such a case, usually, a bag or bottle suspended from a stand is injected into a blood vessel of a living body through a drip tube, a roller clamp, an infusion tube, and an injection needle, and the infusion tube is locally applied by the roller clamp. The amount of the infusion is adjusted by pressing to narrow the cross-sectional area of the infusion tube. However, such operation of the roller clamp not only requires skill but also has a drawback that the amount of infusion varies because the amount of infusion changes with time.

[0003]

On the other hand, a drop sensor for photoelectrically detecting the drop of a drop in a drip tube and a pinch mechanism sandwiching an infusion tube are provided, and the drop number detected by the drop sensor is It is conceivable to control the pinch mechanism so as to match the preset number of drops per unit time. However, the photoelectric drop sensor as described above, the detection accuracy is reduced by light shielding by liquid particles adhering to the inner wall of the drip tube, the detection sensitivity is reduced by the color of the infusion, or noise due to ambient light is mixed, There is a drawback that the detection accuracy is lowered due to a change in the distance between the light projecting element and the light receiving element or a change in the mounting posture depending on the shape of the drip tube.

The present invention has been made in view of the above circumstances, and an object of the present invention is to shield light from liquid particles adhering to the inner wall of the drip tube, color of the infusion solution, ambient light, and types of the shape of the drip tube. Another object of the present invention is to provide a drip detection device having high detection accuracy without being affected by the mounting posture.

[0005]

The gist of the present invention for achieving the above object is to provide a liquid in a drip tube by being brought into contact with a drip tube or an infusion tube connected to the drip tube in a dropper. A drop detection device for detecting a drop of a drop, comprising: (a) a main body mounted on the drop tube or an infusion tube connected thereto, which includes a microphone for detecting vibration generated by the drop of the drop; b) An elastic film which is provided in the main body so as to come into contact with the drip tube or an infusion tube connected to the drip tube and forms an enclosed space communicating with the microphone.

[0006]

With this configuration, since the closed space formed by the elastic film that comes into contact with the dropping cylinder or the infusion tube connected to the dropping cylinder is communicated with the microphone,
The relatively low frequency air vibrations caused by the drop of droplets are preferably transmitted to the microphone through the elastic membrane and the enclosed space, where they are detected.

[0007]

As described above, according to the present invention, since the dropping of the droplet is detected by the vibration of the relatively low frequency generated by the dropping of the droplet in the dropping cylinder, the droplet is attached to the inner wall of the drip cylinder. High detection accuracy can be obtained without being affected by light shielding by liquid particles, color of infusion, ambient light, shape of drip cylinder, or mounting posture.

Further, according to the present invention, since the flexible elastic film is deformed by contacting the drip cylinder with which it comes into contact or the infusion tube connected thereto, the contact area with them can be obtained relatively sufficiently. Therefore, the drip vibration generated in the drip cylinder is preferably transmitted to the closed space, and the detection accuracy of the microphone communicating with the closed space is enhanced.

Further, according to the present invention, it suffices that the drip cylinder or the infusion tube connected thereto is mounted, and the drop trajectory of the liquid drop in the drip cylinder intersects the optical path from the light emitting element to the light receiving element. Since it is not necessary to mount the device as described above, it is possible to perform the mounting work in a short time without requiring skill in mounting.

Preferably, the closed space is communicated with the outside air through pores. According to this, since the sealed space formed by the elastic film is communicated with the outside air through the pores, the volume change of the gas inside the sealed space due to the change of temperature, the sealed space due to the deformation of the elastic film due to creep or use The output of the microphone does not change due to changes in volume, and high detection accuracy can be obtained in this respect as well.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, an infusion bag 12 in which a predetermined infusion such as a nutrient solution, blood, or a medicinal solution is contained is suspended from the upper end of the infusion stand 10. The first infusion tube 14, the drip tube 16, the second infusion tube 18, and an unillustrated injection needle are sequentially connected to the lower end of the infusion solution bag 12, and the injection needle should be inserted into a blood vessel of a living body. Thus, the infusion solution in the infusion solution bag 12 is injected into the blood vessel. The first infusion tube 14 and the second infusion tube 18 are made of flexible transparent resin. Further, the drip tube 16 is
It is a well-known technique in which an infusion solution is dropped one by one so that the flow can be visually observed. The drip tube 1 is provided at a portion of the second infusion tube 18 near the drip tube 16.
Drop detection sensor 2 for detecting the drop of the droplet in 6
0 is mounted, and a part of the second infusion tube 18 is clamped to a part of the second infusion tube 18 positioned a predetermined distance below the part where the drip detection sensor 20 is mounted. 2. A main body device 22 is provided for narrowing the flow cross-sectional area of the infusion tube 18 and adjusting the amount of infusion solution flowing down.

The drop detection sensor 20 is shown in FIGS.
It is configured as shown in. 2 is a horizontal sectional view (FIG. 5)
II-II sectional view of FIG. 3), FIG. 3 is a view showing a facing surface (a sectional view taken along III-III of FIG. 2) of the first rotating member 26, FIG. 4 is a partially cutaway plan view, and FIG. FIG. 5 is a side view with a part cut away along the VV cross section of FIG. 2.

That is, the drip detection sensor 20 has the pin 2
4, a pair of resin-made first rotating member 26 and second rotating member 27, whose one ends are connected to each other and which are provided so as to be relatively rotatable around the pin 24, and the pin 2;
4, a torsion coil spring 30 for constantly urging the first rotating member 26 and the second rotating member 27 in a direction in which their other end portions (the left end portion in FIG. 2) approach each other; 2 A pair of sandwiching members 3 made of an elastic material such as hard rubber provided on the first rotating member 26 and the second rotating member 27 for sandwiching the infusion tube 18.
1 and 32, and is attached to the second infusion tube 18 while sandwiching the second infusion tube 18 located in the notches 28 and 29 formed in the first rotation member 26 and the second rotation member 27, respectively. It is supposed to be done.

First rotating member 26 and second rotating member 27
The elastic film 34 and the elastic film 36, which are made of soft rubber and have an open one surface, and which are in the shape of a rectangular container, are integrally fixed to the opposite surfaces of the elastic film 34 at the end portion on the opening side. A closed space 38 is formed between the rotary member 26 and the rotary member 26. Between the elastic film 36 and the second rotating member 27, a plurality of (for urging the elastic film 36 toward the movable member 26 side in order to obtain a large contact area between the second infusion tube 18 and the elastic film 34 ( For example, four compression coil springs 40 are provided so as to be located on both sides of the second infusion tube 18. The biasing force of the torsion coil spring 30 prevents the drip detection sensor 20 from coming off from the second infusion tube 18 and obtains a clamping force to the extent that the second infusion tube 18 is hardly crushed. It is predetermined.

A condenser microphone (hereinafter, simply referred to as a microphone) 42 is airtight in a mounting hole 41 formed on the back surface of the first rotating member 26 at a position corresponding to the closed space 38 of the first rotating member 26. The closed space 38 is integrally provided by being fitted and the microphone 4 is inserted through a through hole 44 formed in the rotating member 26.
It communicates with the diaphragm 2 which is not shown. As a result, a relatively low frequency (for example, 10 Hz) generated when the liquid drops drop from the first infusion tube 14 into the drip tube 16.
Vibration of up to 20 Hz) is caused by the second infusion tube 18 and the elastic membrane 3.
4, through the closed space 38, and the hole 44 to the diaphragm of the microphone 42.

The first rotating member 26 includes 0.1 to 0.2.
A pipe member 48 having a vertical through hole 46 of about mm mm and having a length of 10 to 20 mm is integrally provided. One end of the vertical through hole 46 is connected to the closed space 38 and The other end of the through hole 46 communicates with the space inside the first rotating member 26. This space is communicated with the outside through a gap or hole (not shown), and the closed space 38 is communicated with the atmosphere through the vertical holes 46 and the like.
The inner diameter and the length dimension of the vertical through hole 46 are set in advance so that the influence of the thermal expansion of the air in the closed space 38 on the microphone 42 can be suitably suppressed and the drop sound is not attenuated.

A sensor mounting detection switch 50 for detecting mounting of the drip detection sensor 20 is provided in a portion located inside the first rotating member 26 and on the other end side. A protrusion for pressing the sensor mounting detection switch 50 through the hole 52 formed in the other end of the first rotating member 26 and the seal film 54 at the other end of the two rotating member 27. 56 is formed. Therefore, in the non-wearing state as shown in FIG.
6, the sensor mounting detection switch 50 is pressed,
In the mounting state in which the second infusion tube 18 is sandwiched as shown in FIG. 2 and FIG. 5, the sensor mounting detection switch 50 has the protrusion 5
Since it is not pressed by 6, the mounting state of the drip detection sensor 20 is detected by the sensor mounting detection switch 50. Note that 57 and 58 are cover members that cover the back surfaces of the first rotating member 26 and the second rotating member 27, respectively.

FIG. 6 is a front view of the main body device 22, and FIG.
8 is a plan view of the main body device 22, and FIG. 8 is a cross-sectional view of a main part of the main body device 22. The main body device 22 is in the form of a rectangular container having an opening on one side, and includes a pair of front and rear cases 60 and 62 made of synthetic resin fitted to each other at the opening-side end portions. As shown in detail in FIG. 8, in the front case 60, a slit 66 formed in the convex portion 64 for passing a part of the second infusion tube 18, and a rotation around the pin 67 to cover the slit 66. The opening / closing member 68 is provided so that it is possible. Opening / closing member 68
Is an operation protrusion 69 that rotates a brake lever 134, which will be described later, when it is operated to its open position, and is hooked to the front case 60 to maintain the closed state, and is hung from the front case 60 by a manual operation. Hook member 7
It has 0 and. The front case 60 is provided with an opening / closing detection switch 71 that is activated when the opening / closing member 68 is closed. In addition, the main body device 22
A flow rate control valve mechanism 72 that adjusts the infusion amount by sandwiching the second infusion tube 18 to change the flow cross-sectional area thereof is provided therein.

9 to 12 show the flow control valve mechanism 7 described above.
The structure of 2 is shown in detail. The first frame 74 is shown in FIG.
As shown in FIG. 1, the front case 60 is provided by a screw (not shown).
The second frame 76 is fixed to the inside of the screw 78
It is fixed to the first frame 74 by.

The first frame 74 has a pair of first pinching levers 80 and a second pinching lever 80 for pinching the second infusion tube 18.
A pinching lever 82 is provided by a pin 84 so as to be rotatable around its axis. The pinching side ends of the first pinching lever 80 and the second pinching lever 82 are located close to the back surface of the convex portion 64 of the first frame 74, as shown in FIG.
As also shown in detail, a rectangular parallelepiped-shaped first elastic member 86 and a second elastic member 88 made of relatively hard rubber or the like are provided on the pressing side end portions of the screw 90 to sandwich the second infusion tube 18. And pin 92. The first elastic member 86 has a pressing protrusion 94 formed in parallel with the longitudinal direction on the surface facing the second elastic member 88,
It is provided with a pair of engagement projections 98 formed on the side surfaces so as to engage with the notches 96 cut in the longitudinal direction from the end surface of the first clamping lever 80. The second elastic member 88 includes four positioning protrusions 100 formed at the four corners of the surface facing the second elastic member 88. The above four positioning protrusions 1
00, the mutual interval in the longitudinal direction of the second pinching lever 82 is sufficiently larger than the major axis of the second infusion tube 18 in a flat state, and the length of the pressing protrusion 94 of the first elastic member 86 is also greater than that major axis. It is set large enough. The above-mentioned four positioning protrusions 100 are for preventing the second infusion tube 18 from coming off during mounting.

The first clamping lever 80 and the second clamping lever 82 are provided with a spring 102 stretched between them.
Thus, the clamping side ends are constantly urged in the opening direction. Further, the second pinching lever 82 is a member having a U-shaped cross section that accommodates a part of the first pinching lever 80, and a pair of the pair is stretched between its end and the first frame 74. The second infusion tube 18 is constantly urged by the spring 104 in the direction of closing the second infusion tube 18, and is brought into contact with the stopper member 105 fixed to the first frame 74. The first frame 74 of the pair of springs 104
The end portion on the side is hooked on a moving bracket 108 that is moved by rotating the screw 106, and the biasing force in the closing direction is adjusted. As shown in FIG. 8, on the upper surface of the second pinching lever 82, a resin friction member 110 having a friction surface on which irregularities are formed along an arc centered on the pin 84 is screw 11.
It is fixed by 2.

The first pinching lever 80 has an elongated hole 11 formed in the longitudinal direction to fit the small diameter portion of the stepped shaft 114.
6 and an action protrusion 120 for pressing and operating the fully closed position detection switch 118 for detecting the fully closed position. The first frame 74 has a guide member 122 made of nylon resin having a cylindrical portion and a disc-shaped base portion.
Of the screw 1 together with the linear stepping actuator 124 positioned so as to be concentric with the guide member 122.
It is fixed by 26. The linear stepping actuator 124 includes a screw shaft 128 that is rotationally driven by a pulse motor, and the rotation of the screw shaft 128 drives the stepped shaft 114 guided by the cylindrical portion of the guide member 122 in the axial direction. It has become.
The linear stepping actuator 124 is, for example, a first unit in 0.008 mm unit corresponding to a drive signal of one pulse.
The tightening position of the clamping lever 80 can be changed.

A fully closed position detection switch 118 is mounted at a position where the end of the first clamping lever 80 of the first frame 74 approaches when the first clamping lever 80 is at the fully closed position. Further, the second frame 76 is provided with a through hole 132 into which the small diameter portion of the stepped shaft 114 is fitted and which guides the small diameter portion. The second frame 76 has a brake lever 134.
A support bracket 136 for supporting the is fixed by a screw 138. The brake lever 134 has a substantially L-shape, and is provided with a friction member 140 that extends in the direction along the stepped shaft 114 and that is fixedly provided on a surface of the friction member 110 facing the friction surface of the friction member 140. A portion 142 and an abutting portion 144 that extends in a direction along the first pinching lever 80 and abuts on the working protrusion 69 of the opening / closing member 68. The brake lever 134 is attached to the support bracket 136 so as to be rotatable about its axial center by a pin 146 in the vicinity of an intermediate corner of the brake lever 134.
The spring 148 stretched between the tip of the second frame 74 and the first frame 74 constantly urges it in the clockwise direction in FIGS. 8 to 10. In this embodiment, the brake lever 134 and the friction member 110 are connected to each other by the brake device 130.
Are configured.

As a result, when the opening / closing member 68 is opened as shown by the solid line in FIG. 8, the brake lever 134 is rotated counterclockwise in FIGS. 8 to 10 according to the urging force of the spring 148 to cause friction. The material 140 is the friction member 110.
The second pinching lever 82 is returned by the spring 104 to the position where it abuts on the stopper 105, as shown in FIG. Normally, in this state, the first pinching lever 80 is returned to the fully open position shown in FIG. 10 by the linear stepping actuator 124, so that the second infusion tube 18 passes through the slit 66 to the first pinching lever by the medical staff. When the holding switch 158 is operated while being inserted between the pressing side end portions of the second pressing lever 80 and the second pressing member 82, that is, between the first elastic member 86 and the second elastic member 88, as shown in FIG. Further, the linear stepping actuator 124 rotates the first pinching lever 80 to its fully closed position, that is, to the position at which the fully closed position detection switch 118 operates to close the flow path in the second infusion tube 18. Then, when the opening / closing member 68 is closed and the brake lever 134 is rotated clockwise in the drawing according to the urging force of the spring 148, the friction material 140 is pressed against the friction surface of the friction member 110 by the second clamping pressure. The rotation of the lever 82 is blocked in that position. Therefore, even if a tube of a different type such as a wall thickness is used as the second infusion tube 18, it is
The flow path is surely closed at the fully closed position of the clamping lever 80, and the flow cross-sectional area in the second infusion tube 18 is increased corresponding to the amount of rotation of the first clamping lever 80 from the fully closed position. . The second pinching lever 82 in FIG. 8 is shown in a position in which its rotation is blocked by the brake device 130.

FIG. 13 is a block diagram showing the electrical construction of the control circuit provided in the main body device 22. In the figure, the condenser microphone 42 has a good low frequency characteristic, and the output signal from the condenser microphone 42 is an amplifier 160.
After being amplified by, the dropping sound is extracted by being passed through a band pass filter 162 having a low frequency pass band of 10 to 20 Hz, and A
The signal is converted into a digital signal by the / D converter 164 and supplied to the microcomputer 166 as the signal ST. In addition, a start / stop switch 168, a flow rate (flow velocity) setting switch 170, and a total amount setting switch 17
2, sensor mounting detection switch 50, open / close detection switch 7
1. The outputs from the fully closed position detecting switch 118 are also supplied to the microcomputer 166. The flow rate setting switch 170 is a switch for selecting one of the number of drops per minute and the amount of drop per hour (ml), a number indicating the number of drops per minute or the amount of drop per hour (ml). It consists of up switch and down switch to be changed. Also, the total amount setting switch 172
Is composed of a switch for selecting one of the set dropping amount (ml) and the setting dropping time, an up switch and a down switch for changing the set dropping amount (ml) or a numerical value indicating the setting dropping time. Note that the number of drops per 1 ml is constant due to the structure of the drip tube 16, for example, 15 drops /
ml.

The microcomputer 166 is a CP
U174, ROM176, RAM178, input port 1
80, an output port 182, etc., and a CPU 17
4 is a ROM while using the temporary storage function of the RAM 178
The input signal is processed in accordance with the program stored in 176, and the display drive control circuit 184 causes the display 186 to display each set value, a total drop amount at the present time, or a numerical value indicating the drop elapsed time, and to control the flow rate. In order to drive the linear stepping actuator 124 via the pulse motor drive control circuit 188, and the buzzer drive circuit 19
The piezoelectric buzzer 192 is driven via 0. For example, each time the hold switch 158 is operated, the linear stepping actuator 124 is driven so that the second infusion tube 18 is alternately fully closed or fully opened. Further, when a start-up operation is performed by the start / stop switch 168, the supply amount of the infusion liquid is controlled to be the set amount. The display 186 is a liquid crystal display plate 194 for displaying a numerical value indicating the number of drops per minute or the drop amount per hour (ml), the set drop amount (ml) or the set drop time or the present time. Liquid crystal display panel 1 for displaying a numerical value indicating the total amount of drops or elapsed time of drops
96, an alarm indicator light 198 and the like.

As described above, according to the present embodiment, since the closed space 38 formed by the elastic film 34 that contacts the second infusion tube 18 is communicated with the condenser microphone 42, the drop of the liquid drop is achieved. The relatively low-frequency air vibration generated by is preferably transmitted to the condenser microphone 42 through the elastic film 34 and the closed space 38,
It is detected there.

Thus, according to this embodiment, the dropping cylinder 1
Since the drop of the liquid droplet is detected by the vibration of the liquid droplet in 6 which is generated at a relatively low frequency, the drip cylinder 16
High detection accuracy can be obtained without being affected by the light shielded by the liquid particles attached to the inner wall, the color of the infusion solution, the ambient light, the shape of the drip tube, or the mounting posture.

Further, according to this embodiment, the flexible elastic film 3 is used.
Since 4 comes into contact with the second infusion tube 18 with which it comes into contact and is deformed, a contact area with them is obtained comparatively sufficiently, so that the drip vibration generated in the drip tube 16 is suitable for the closed space 38. Is transmitted to the closed space 38 to improve the detection accuracy of the drop by the condenser microphone 42.

Further, according to this embodiment, it is only necessary to mount it on the second infusion tube 18, so that the drop trajectory of the droplet in the dropping cylinder 16 and the optical path from the light emitting element to the light receiving element intersect. Since it is not necessary to mount it on the dropping cylinder 16, it is possible to perform the mounting work in a short time without requiring skill for mounting.

Further, in this embodiment, since the closed space 38 is communicated with the atmosphere through the narrow vertical hole 46 of the pipe member 48, the volume change of the gas inside the closed space 38 due to the change of the air temperature and the elastic film 34. The output of the condenser microphone 42 does not change due to a change in volume of the closed space 38 due to creep or deformation due to use, and high drop detection accuracy can be obtained.

Although one embodiment of the present invention has been described above with reference to the drawings, the present invention can be applied to other modes.

For example, although the drip detection sensor 20 of the above-described embodiment is mounted on the second infusion tube 18 at a position near the drip tube 16, it may be mounted on the drip tube 16 itself. In this case, since the drip tube 16 has a larger diameter than the second infusion tube 18, the drip detection sensor 20 needs to be configured accordingly.

Further, the drop detection sensor 20 of the above-mentioned embodiment.
Then, in order to hold the second infusion tube 18 with the elastic film 34, the elastic film 36 urged by the compression coil spring 40 is provided on the second rotating member 27.
Instead of them, an elastic member such as a soft sponge may be used.

Further, the drop detection sensor 20 of the above-mentioned embodiment.
In order to communicate the closed space 38 with the atmosphere, a pipe member 48 having a small-diameter vertical passage hole 46 is provided. However, the length of the pipe member 48 and the diameter of the vertical passage hole 46 are detected by the condenser microphone 42. The thickness is appropriately changed according to the thickness of the elastic film 34, the volume of the closed space 38, and the like so as not to be affected by temperature fluctuations and the like within a range that does not reduce the gain.

Further, the drop detection sensor 20 of the above-mentioned embodiment.
Instead of the pipe material 48 in, the pores may be directly formed in the first rotating member 26 or the elastic film 34.

Further, in the above-mentioned embodiment, the condenser microphone 42 is used to detect the low frequency sound generated by the dropping, but other types of microphones may be used.

The bandpass filter 164 of the above-described embodiment has a pass band of 20 to 40 Hz. This frequency band is the size of the drip tube 16, the type of infusion solution, and the condenser microphone 42. It can be appropriately changed according to the characteristics of the.

The above description is merely one embodiment of the present invention, and the present invention can be modified in various ways without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a usage state of an automatic infusion device according to an embodiment of the present invention.

2 is a view for explaining the configuration of the drop detection sensor of FIG. 1, and is a sectional view taken along line II-II of FIG.

3 is a view showing a facing surface of a first rotating member of the drip detection sensor of FIG. 1, and is a sectional view taken along line III-III of FIG.

FIG. 4 is a view for explaining the configuration of the drip detection sensor of FIG. 1 and is a partially cutaway plan view.

5 is a side view illustrating the configuration of the drip detection sensor of FIG. 1, with a part cut away along the VV cross section of FIG. 2. FIG.

6 is a front view of the main body device of FIG. 1. FIG.

7 is a plan view of the main body device of FIG. 1. FIG.

FIG. 8 is a plan view showing the flow control valve mechanism provided in the main body device of FIG. 1 together with a part of the case by cutting out a part of the frame thereof.

9 is a plan view showing a flow rate control valve mechanism provided in the main body device of FIG. 1. FIG.

10 is a view showing a flow rate control valve mechanism provided in the main body device of FIG. 1, and is a cross-sectional view taken along line XX of FIG.

FIG. 11 is a left side view of FIG. 9.

FIG. 12 is a diagram illustrating a state where the second infusion tube is clamped by the first pinching lever and the second pinching lever of the flow rate control valve mechanism.

13 is a block diagram illustrating an electrical configuration of a control device provided in the main body device of FIG.

[Explanation of symbols]

 16: Drip tube 18: Second infusion tube 26: First rotating member, 27: Second rotating member (main body) 34: Elastic film 38: Sealed space 42: Condenser microphone 44: Through hole (communication hole) 46: Longitudinal hole (pore) 48: Pipe material

Claims (2)

[Claims] 1. A drip detection device for detecting a drop of a liquid drop inside the drip cylinder by being brought into contact with a drip cylinder or an infusion tube connected thereto in a dropper, the drop detection device being generated by the drop of the liquid drop. A body equipped with a microphone for detecting vibration that is attached to the drip tube or an infusion tube connected thereto, and the body provided so as to come into contact with the drip tube or an infusion tube connected thereto A dropping detection device comprising: an elastic film forming an enclosed space communicating with a microphone. 2. The dripping detection device according to claim 1, further comprising pores for communicating the closed space with the atmosphere.