JP3021870U - Water level alarm device for injection in intravenous injection - Google Patents

Abstract

(57) [Summary] [Object] To provide a water level alarm device for an injectable solution, which gives an alarm when the liquid level of the remaining injectable solution reaches a predetermined position during intravenous injection and notifies the end time. A sticking device for sticking to a side wall of an injection solution bottle, a bridge circuit having two infrared sensors, a single-chip microprocessor for storing an initial output value of the bridge, a button, a buzzer, and the like. First,
The initial output value of the bridge is stored in the microprocessor. When the water level of the injection bottle drops to a predetermined position, the reflected light changes because the infrared sensor does not hit the liquid, and the output value of the bridge circuit also changes. As a result, the microprocessor outputs an alarm signal and an alarm is generated from the buzzer.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a device for alarming the water level of an injection solution during intravenous injection, and in particular, it detects the change of the water level of the injection solution by two infrared light sensors attached to the side wall of the injection solution bottle. The present invention relates to a water level alarm device that forms a bridge circuit and further reads the data with a microprocessor and issues an alarm signal from a buzzer.

[0002]

[Prior art]

 As is well known, it can be said that intravenous injection, so-called “drip”, is a therapeutic action often performed in the course of medical treatment. Intravenous injections are time consuming, and it is usually the caregiver's use of the injection fluid that is used up without having to wait. Instead, at most intervals, examine and examine the condition of the remaining injection solution. When the injection solution is almost used up, the needle is removed or replaced with a new injection solution. However, due to a shortage of nurses, in addition to artificial damage, a phenomenon in which blood flows back into the injection liquid bottle due to an excessive amount of injection liquid being used or the injection liquid being used up, or air inside the body There is a risk of being injected. Moreover, even if the nurse is busy, the condition of the injectable solution must be checked frequently, which not only makes it difficult, but also interferes with work.

In addition, at the present time, in the controller of the injection solution in the clinic, not only its volume and power consumption are very large, but also its price is considerably high (tens of thousands yuan NT), so it is a favorite item for everyone. I can't say. In the meantime, the conventional device uses a system that detects the drip of an infusion and sounds an alarm signal after a certain period of time has passed after the drip has stopped, so an alarm is issued at an arbitrary level of the injection solution. Is impossible.

[0004]

[Problems to be solved by the device]

 Therefore, the main purpose of the present invention is to warn the water level of the injection liquid to be injected at an arbitrary level, and thus to be able to perform the intravenous injection of the required amount of injection liquid according to the patient, and to reduce the burden on the nurse. An object is to provide a device that can be reduced and can be kept at a price of several tenths of that of the existing device.

[0005]

[Means for Solving the Problems]

 A water level alarm device for intravenous injection according to the present invention comprises two infrared sensors, a bridge circuit that outputs a bridge output value that changes according to a signal change from the infrared sensors, and an injection liquid bottle that is applied. A member for attaching at least the infrared sensor to the side wall of the injection solution bottle so that the infrared sensor of the bridge circuit emits light to the injection liquid therein and receives the reflected light; and a bridge from the bridge circuit. An A / D conversion circuit for changing the output value to a digital signal, and the initial output value of the bridge output value from the bridge circuit sent from the A / D conversion circuit is saved and then The actual change value sent after that is compared, and a single-chip microprocessor that issues an alarm signal when the difference between the two exceeds a predetermined value. When composed of the buzzer which is activated by the alarm signal from the microprocessor, the button for resetting the microprocessor After generating the save and alarm signal of the initial output value in the microprocessor.

With the above structure, in the water level alarm device of the present invention, the two infrared sensors attached to the side wall of the injection solution bottle emit light to the injection solution in the injection solution bottle, and the reflected light is emitted. Receive light. The microprocessor stores the initial output value of the bridge circuit. Injection When the water level of the injectable liquid drops to a certain level, the light from one side of the infrared sensor does not hit the injectable liquid and the state of the reflected light changes. As a result, the microprocessor causes the buzzer to issue an alarm signal in response to changes in the bridge output value.

[0007]

[Embodiment of device]

 The present inventor finally developed the present invention through research and devising in consideration of the above-mentioned dangers and inconveniences.

Specifically, in the present invention, when the injection bottle is irradiated with infrared rays by the light source of the infrared sensor, the intensity of the reflected light also differs depending on whether the injection solution in the bottle is hit or not. Also, if the phototransistor of the infrared sensor receives reflected light of different intensity, the turn-on state will always be different. Taking advantage of this phenomenon, two infrared sensors are used to form a bridge circuit, and then a single-chip microprocessor stores the initial output value of the bridge. When the water level of the injection bottle drops to a certain level, the infrared sensor does not hit the injection solution, so the reflected light changes and the output value of the bridge circuit also changes. As a result, a means has been taken in which the microprocessor provides a signal accordingly and the buzzer issues an alarm signal.

In order to further understand the present invention, the special structure and operation will be described in more detail with reference to the drawings.

[0010]

【Example】

First, please refer to FIG. It is a diagram illustrating a bridge circuit according to an embodiment of the present invention. Among them, the light emitting diode LED1 and the phototransistor TR1 and the light emitting diode LED2 and the phototransistor TR2 are infrared sensors, respectively, which form a bridge circuit according to each resistance. Since the adjusting resistor VR balances the bridge circuit while adjusting the luminous intensity of the light emitting diode LED2, the output value V _D of the bridge is close to zero.

The structure of the bridge not only avoids erroneous operation due to changes in external light and shadow, but also prevents influences due to voltage fluctuations. Specifically, the phototransistors TR1 and TR2 receive the reflected light from the light emitting diodes LED1 and LED2 which are the light sources of infrared rays, and the influence of the change of the external light is also affected. Are added to the phototransistors TR1 and TR2 at the same time, so the amount of change can be said to be the same. Therefore, in the bridge design of the present invention, it is possible to exert the effect of eliminating the change of extraneous light for the output value V _D taken between the phototransistors TR1 and TR2. According to the same principle, the influence of the voltage fluctuation is also applied to the phototransistors TR1 and TR2 at the same time, so that the bridge structure can eliminate the influence of the fluctuation. In other words, the structure of this bridge improves the obstruction and error operation that were caused by factors such as external light changes and voltage instability in the conventional infrared sensor circuit.

Please refer to FIG. 2 next. It is a diagram showing the positional relationship between the infrared sensor and the water level of the injection liquid in the embodiment of the present invention. When the injection solution is at level L1, the light from the two infrared sensors both strikes and is reflected by the injection solution, so the bridge in FIG. 1 is in balance. However, when the injection liquid drops to the level L2, the reflected light received by the phototransistor TR1 changes, the bridge in FIG. 1 shifts to the unbalanced state, and the output value also changes.

However, since the infrared sensor is attached to the injection solution bottle, even if the bridge is adjusted to the balance state, the bridge circuit is always perfect due to factors such as the inclination angle of the attachment or uneven container manufacturing. It is impossible to achieve a good balance. In order to solve this problem, as shown in FIG. 3, a single-chip microprocessor 4 is placed after the bridge circuit 1 and the initial output value is recorded according to the instruction for reading the initial output value. When the level of the injection liquid drops, the microprocessor 4 compares the output value from the changing bridge, that is, the actual change value with the initial output value, and when a different state D is detected, an alarm signal is output to the buzzer to sound. .

FIG. 4 is an electric circuit diagram of an embodiment of the present invention, in which 1 is a bridge circuit, 2 is a circuit for outputting a balanced state of the bridge circuit as an analog signal, and 3 is A / D conversion. It is a circuit, 4 is a single-chip microprocessor, and 5 is a buzzer. For the software related to the processing of the microprocessor 4, refer to the flowchart of FIG.

FIG. 6 is a plan view, a front cross-section and a bottom view of a water level alarm device according to an embodiment of the present invention. At the bottom of the water level alarm device is a member 6 for sticking to an injection bottle, and at the side is a button 7. When the button 7 is pressed the first time, the single-chip microprocessor records the initial output value of the bridge circuit. If you press the second time when the buzzer sounds, you can reset the alarm signal and stop.

Accordingly, the change in the water level of the injection liquid is detected mainly by the two infrared sensors provided in the bridge circuit. Then, an alarm signal is emitted from the buzzer by the A / D conversion circuit and the single-chip microprocessor, which helps the caregiver's attention.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a bridge circuit according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a positional relationship between an infrared sensor and a water level of an injection drip in the embodiment of the present invention.

FIG. 3 is an illustration of connecting a bridge circuit to a single-chip microprocessor according to an embodiment of the present invention.

FIG. 4 is an electric circuit diagram of an embodiment of the present invention.

FIG. 5 is a flowchart of software of a microprocessor according to an embodiment of the present invention.

FIG. 6 is a plan view, a front cross-section, and a bottom view of an embodiment of the present invention.

[Explanation of symbols]

1 bridge circuit 2 circuit that outputs the balanced state of the bridge circuit as an analog signal 3 A / D conversion circuit 4 microprocessor 5 buzzer

Continued Front Page (73) Utility Model Holders 595082331 Ciang Chiu-Hsiung Taiwan Taiwan, Taipei, Pay-toe, Lifung Street, Lane 279, Array 4, Number 3, 5 Floor # 5Fl. , No. 3, Alley 4, Lane 279, Li Hung St. , Pei-Tou, Taipei, Taiwan, R .; O. C. (72) Creator Khao Han-Ching Taiwan Taiwan, Taipei, Dalon Street, No. 56 (72) Creator Chian Chiu Siun Taiwan Taiwan, Taipei, Pay-toe, Lifung Street, Lane 279, A Ray 4, Number 3, 5 floors

Claims (1)

[Scope of utility model registration request] 1. A bridge circuit comprising two infrared sensors, which outputs a bridge output value that changes in response to a signal change from the infrared sensors, and an injection solution in an injection solution bottle to which the bridge circuit is applied. A member for attaching at least the infrared sensor to the side wall of the injection vial so that the infrared sensor emits light and receives the reflected light, and for converting the bridge output value from the bridge circuit into a digital signal. After saving the initial output value of the bridge output value from the A / D conversion circuit and the bridge circuit sent from the A / D conversion circuit, the initial output value and the actual change value sent thereafter are saved. And a single-chip microprocessor that generates an alarm signal when the difference between the two exceeds a predetermined value, and an alarm signal from the microprocessor. And a button for saving the initial output value of the microprocessor and resetting the microprocessor after generating an alarm signal. Water level alarm device.