JP2015173893A - Liquid medicine detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid medicine detector capable of making a lamp indicating medication light or blink precisely in response to liquid medicine flowing downward while forming a liquid column, even in a situation where a drip tube is easy to become dim.SOLUTION: In a liquid medicine detector, a luminous element 11a and a light receiving element 11b sandwich a falling locus of liquid medicine 120, and a notification part such as an in-medication lamp 21a notifies a user of the medication of the liquid medicine 120 on the basis of a signal inputting from the light receiving element 11b. Further, the liquid medicine detector includes a signal input part which inputs the signal to the notification part when an intermittent signal output from a sensor 11 consisting of the luminous element 11a and the light receiving element 11b becomes shorter than a certain interval, during the subsequent period when the signal is not output from the sensor 11.

Description

  The present invention relates to a chemical liquid detection device for detecting a chemical liquid falling in a drip tube communicating with a chemical liquid bottle via a tube.

  In general, when a drug solution is administered to a subject by an instillation method, there are a dosing speed and a timing of the end of dosing. For this reason, conventionally, a person in charge of medication has confirmed the medication speed and the timing of the completion of medication by visually observing the drug solution falling from the drip tube inserted between the drip bottle and the drip needle. However, due to the shortage of doctors and nurses, the duties of the person in charge of medicine are diverse and it is difficult to constantly monitor the infusion. Therefore, a chemical solution detection device that detects a chemical solution falling in the drip tube has been proposed (see, for example, Patent Document 1).

  This chemical solution detection device detects the fall of the chemical solution by a sensor, and the chemical solution to be detected is a drip medicine. The sensor is composed of a light emitting element and a light receiving element, and is built in a sensor holder to which a drip tube is attached. The sensor holder is provided with an insertion port, and is attached to the sensor holder by inserting a drip tube into the insertion port.

  In a state where the drip tube is attached to the sensor holder, the light emitting element and the light receiving element face each other so as to sandwich the dropping trajectory of the drip liquid. At the timing when the drip liquid is dropped, since the drip liquid exists between the light emitting element and the light receiving element, the light emitted from the light emitting element is hindered by the drip liquid, and the amount of light received by the light receiving element is reduced. Therefore, if signals are output from the light receiving element at regular intervals, it is possible to detect that the drip liquid is being dripped smoothly. When a drip solution is detected, the lamp is turned on, and when the drip solution cannot be detected for a predetermined time or longer, a buzzer sound is output to notify the person in charge of the dosing with the dosing speed or the end of dosing. it can.

Registered Utility Model No. 3055280

  Here, in the medical field, the medicinal solution to be administered by the drip method is not limited to the instillation, and an anesthetic is also administered to the subject by the drip method. In the medical field, there is a demand for a chemical detection device that can detect this anesthetic. In many cases, the anesthetic is administered by joining the anesthetic from the middle of the tube interposed between the chemical solution bottle and the drip tube.

  However, the dropping mode of the drip medicine in the drip tube is dropping, but the dropping mode of the anesthetic drug in the drip tube is the flow down to form a liquid column. That is, the signal output from the light receiving element is always a Hi signal or a Lo signal, depending on the circuit configuration. The signal output from the light receiving element is always a Hi signal or Lo signal by blocking between the light emitting element and the light receiving element. In addition to the formation of the liquid column, the drip tube is cloudy. .

  Therefore, when the liquid temperature of an anesthetic etc. is higher than room temperature, there exists a possibility that it may become impossible to distinguish whether the lighting of the lamp is caused by the liquid column or clouding of the drip tube. Further, even if the liquid column can be distinguished from the cloudiness, the output intensity of the signal becomes extremely unstable, and the chemical liquid detection device may malfunction. Therefore, in the worst case, the reliability of the drug solution detection device is lowered, and it becomes impossible to reduce the labor of the infusion monitoring work of the person in charge of medication.

  The present invention has been proposed in order to solve the above-described problems. Even when a chemical liquid having a liquid temperature higher than room temperature is administered by forming a liquid column, the liquid column is formed. It is an object of the present invention to provide a chemical solution detection apparatus capable of accurately lighting or blinking a lamp indicating medication.

  In order to achieve the above object, a chemical liquid detection apparatus according to the present invention is a chemical liquid detection apparatus for detecting a chemical liquid falling in a drip tube communicating with a chemical liquid bottle via a tube, and the chemical liquid detection apparatus An informing unit for informing medication, a light emitting element and a light receiving element sandwiching the drop trajectory of the medicinal solution, a sensor for inputting a signal to the informing unit, and an interval between signals output from the sensor is shorter than a predetermined interval In this case, a signal input unit that inputs a signal to the notification unit while a signal is not output from the sensor thereafter is provided.

  When the intermittent signal output from the sensor is shorter than a predetermined interval, the signal input unit includes a latch unit that holds a signal output state, and a first unit that reaches the notification unit from the sensor without passing through the latch unit. A signal path and a second signal path from the sensor to the notification unit via the latch unit, wherein the notification unit is at least one of the first signal path and the second signal path. You may make it alert | report a medication in response to the signal input more.

  A voltage converter that outputs a voltage signal proportional to the frequency of the intermittent signal output from the sensor to the latch unit as a set signal is provided, and the latch unit sets a voltage signal based on the intermittent signal shorter than the predetermined interval. You may make it receive as a signal.

  The latch unit may hold the signal output state while no signal is output from the sensor.

  The notification unit may be a lamp indicating that medication is being performed.

  In addition to the lamp indicating that the medication is in progress, the notification unit may include a lamp that indicates the completion of medication.

  The notification unit may include a speaker that outputs a buzzer sound indicating the end of medication.

  According to the present invention, even in an environment in which the drip tube is likely to be clouded, the medication lamp can be turned on with high accuracy for the drug solution that flows down by forming a liquid column, and the reliability of the device is increased. .

It is a schematic diagram which shows schematic structure of the chemical | medical solution detection apparatus which concerns on this embodiment. It is a circuit diagram of the signal input part which lights or blinks a medication lamp. It is a graph which shows the output of each part in a circuit when the dripping space | interval of a chemical | medical solution is long. It is a graph which shows the output of each part in a circuit when the dropping interval of a chemical | medical solution is short. It is a graph which shows the output of each part in a circuit at the time of changing to a liquid column after the dripping space | interval of a chemical | medical solution becomes short. It is a graph which shows the output of each part in a circuit when a chemical | medical solution returns to dripping after forming a liquid column. It is a schematic diagram which shows schematic structure of the chemical | medical solution detection apparatus which concerns on other embodiment.

  Hereinafter, an embodiment of a chemical solution detection device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing a schematic configuration of a chemical liquid detection apparatus according to the present embodiment. The chemical liquid detection device 1 includes a sensor holder 10 and an alarm body 20. The sensor holder 10 includes a sensor 11 that detects the chemical solution 120. The sensor holder 10 and the alarm body 20 are connected by a cable. An output signal of the sensor holder 10 is input to the alarm main body 20 via a cable, and power is supplied to the sensor holder 10 via a cable from a power source included in the piece or the alarm main body 20. The alarm body 20 is also a notification unit that notifies the medication state according to the signal output result of the sensor 11. The drug solution 120 is a liquid having a medicinal effect, and is a drip solution or an anesthetic. The medication state to be notified is during the medication of the drug solution 120 by the lighting or extinguishing of the lamp or the completion of the medication.

  The chemical liquid 120 is accommodated in a chemical liquid bottle 100 suspended from a chemical liquid bottle stand (not shown), and flows from the chemical liquid bottle 100 into the infusion tube 110 through the tube. In the drip tube 110, the chemical 120 flows down from the dropping port 140 that is in communication with the tube to form a drip or liquid column 121 and is temporarily stored in the lower part. The tube is provided with a wheel for adjusting the dropping amount, and the dropping speed is adjusted by rotating the wheel. When the liquid column 121 is formed, the wheel is rotated to gradually shorten the dropping interval to reach the liquid column 121.

  The sensor holder 10 is detachably attached to the drip tube 110. That is, the sensor holder 10 is provided with an insertion port 13 into which the infusion tube 110 is inserted. The insertion port 13 is provided through the sensor holder 10 from the upper surface to the lower surface of the sensor holder 10. The drip tube 110 is inserted into the insertion port 13. An adapter 30 that holds the drip tube 110 is detachably attached to the sensor holder 10. The adapter 30 is a plate-like member that holds the drip tube 110 from the periphery with a constant pressure. The adapter 30 is provided with a fitting hole 31 at a position corresponding to the insertion port 13. The fitting hole 31 press-fits the drip tube 110.

  The alarm main body 20 is suspended from a chemical liquid bottle stand in the usage state of the chemical liquid detection device 1. The alarm body 20 has a string member 20a, and is hung together with the chemical liquid bottle 100 by hooking the string member 20a on the chemical liquid bottle stand. Both ends of the string member 20 a are fixed to the upper end surface of the alarm body 20. Thereby, the load of the alarm main body 20 is not applied to the sensor holder 10, and the possibility that the sensor holder 10 is detached from the drip tube 110 is reduced. The alarm body 20 is provided with a medication lamp 21a. The medication lamp 21a blinks when the dropped drug solution 120 is detected, and lights up when the liquid column 121 is detected.

  FIG. 2 is a circuit diagram of the sensor 11. The sensor 11 includes a light emitting element 11a that emits light and a light receiving element 11b that outputs a signal A having an intensity corresponding to the amount of light received from the light emitting element 11a. The light emitting element 11 a and the light receiving element 11 b of the sensor 11 are provided to face each other via the insertion port 13, and sandwich the drop trajectory of the drug solution 120 when the infusion tube 110 is inserted. That is, an imaginary line connecting the light emitting element 11 a and the light receiving element 11 b intersects with a virtual cylinder that is lowered downward from the dropping port 140 in the drip tube 110. The light emitting element 11a is, for example, a light emitting diode. The light receiving element 11b is, for example, a phototransistor. Light is converted into a base current by the photoelectric effect, and an electric signal flows between the emitter and the collector.

  In the alarm main body 20, various electronic components are provided as a signal input unit for lighting or blinking the medication lamp 21a. That is, an amplifier 23 and a mixer 24 are connected in series to the sensor 11, and a medication lamp 21 a is connected to the output side of the mixer 24. The amplifier 23 has two outputs, the first system is connected to the mixer 24, and the second system is connected to the voltage converter 25. A latch circuit 26 is connected to the voltage converter 25. The latch circuit 26 uses the output of the voltage converter 25 as a set signal. The output side of the latch circuit 26 is connected to the mixer 24. Entered. That is, the mixer 24 mixes the output of the amplifier 23 and the output of the latch circuit 26 and outputs it to the medication lamp 21a. In addition, a reset circuit 27 is connected to the sensor 11 in parallel with the amplifier 23. The reset circuit 27 outputs a reset signal to the latch circuit 26.

  The voltage converter 25 is, for example, an FV converter, and inputs a voltage signal proportional to the pulse frequency to the latch circuit 26 as a set signal. That is, the voltage converter 25 inputs a voltage signal proportional to the signal output interval of the light receiving element 11 b to the latch circuit 26. The latch circuit 26 sets the output to a high level when the voltage signal output from the voltage converter 25 is at a high level. The reset circuit 27 inputs a reset signal to the latch circuit 26 when the light receiving element 11b outputs a signal. According to this circuit, the latch circuit 26 starts to input a high-level voltage signal to the mixer 24 when the continuous interval of the signals output from the light receiving element 11b becomes equal to or less than a certain value. In addition, while the latch circuit 26 is outputting a high level voltage signal, if the light receiving element 11b changes from a signal non-output state to a signal output state, a reset signal is input to the latch circuit 26.

  The operation of the sensor 11 having such a circuit configuration will be described with reference to FIGS. In addition, when the chemical | medical solution 120 is an anesthetic etc., the flow-down aspect is the liquid column 121, but this liquid column 121 is formed by shortening the dripping space | interval of the chemical | medical solution 120. That is, in the liquid column 121, the dropping of the chemical solution 120 is started, and the dropping interval is shortened, and the liquid column 121 is finally formed. Then, in the process of emptying the chemical liquid bottle 100, the dropping interval of the chemical liquid 120 is delayed again, and finally the chemical liquid 120 is not dripped. 3 shows a state in which the drug solution 120 is dripped at intervals longer than the constant interval S, FIG. 4 shows a state in which the liquid drug 120 has transitioned to dripping at intervals shorter than the constant interval S, and FIG. FIG. 6 shows a state in which the chemical liquid 120 becomes the liquid column 121, and FIG.

  As shown in FIG. 3A, the dropping interval of the chemical solution 120 is longer than the fixed interval S in the state where the dropping of the chemical solution 120 is started. At this time, the light receiving element 11b does not output a signal when the particle of the chemical liquid 120 blocks between the light emitting element 11a and the light receiving element 11b, and the space between the particle and the particle of the chemical liquid 120, the light emitting element 11a, and the light receiving element 11b. A signal is output when the intervals coincide. Therefore, the light receiving element 11b outputs an intermittent signal having a pulse period longer than the constant interval S.

  The intermittent signal is amplified by the amplifier 23 and input to the mixer 24. The intermittent signal is amplified by the amplifier 23 and input to the voltage converter 25. The voltage converter 25 outputs a voltage signal inversely proportional to the pulse period longer than the constant interval S to the latch circuit 26 as a set signal. The constant interval S is such that when the voltage converter 25 converts the voltage signal into a voltage signal, the voltage signal reaches an operating voltage as a set signal of the latch circuit 26. That is, as shown in FIG. 3B, the voltage signal proportional to the pulse period longer than the constant interval S is not established as a set signal in the latch circuit 26, and the latch circuit 26 ), The voltage signal output state is not maintained. Therefore, as shown in FIG. 3, when the dropping interval of the chemical solution 120 is longer than the predetermined interval S, only the intermittent signal directly output from the amplifier 23 is input to the mixer 24. As shown in FIG. 3D, the intermittent signal is output to the medication lamp 21a. Therefore, the medication in progress lamp 21a blinks in accordance with the system directly from the amplifier 23 to the mixer 24.

  Next, as shown in FIG. 4A, when the dropping interval of the chemical liquid 120 becomes shorter than the constant interval S, the light receiving element 11 b outputs an intermittent signal having a pulse period shorter than the constant interval S. The intermittent signal is amplified by the amplifier 23 and input to the mixer 24. The intermittent signal is amplified by the amplifier 23 and input to the voltage converter 25. The voltage converter 25 outputs a voltage signal inversely proportional to the pulse period shorter than the constant interval S to the latch circuit 26 as a set signal. At this time, as shown in FIG. 4B, the voltage signal output from the voltage converter 25 reaches the operating voltage of the latch circuit 26 and is established as a set signal. As shown, the output state of this voltage signal is maintained. Therefore, when the dropping interval of the chemical liquid 120 is shorter than the predetermined interval S, the mixer 24 receives signals from the amplifier 23 and the latch circuit 26, and as shown in FIG. A signal resulting from the mixing is output to the medication lamp 21a. The medication lamp 21a is turned on by this intermittent signal.

  Further, as shown in FIG. 5A, when the chemical liquid 120 forms the liquid column 121, the light emission signal 11a and the light reception signal 11b are continuously blocked by the liquid column 121, and the light reception signal 11b is a signal. Will not be output. However, until just before the liquid column 121 is formed, the light reception signal 11b outputs a signal, and the output signal is due to the formation of the liquid column 121 having undergone a process in which the dropping interval is shorter than the constant interval S. It is held in the latch circuit 26. Therefore, no signal flows through the system directly from the amplifier 23 to the mixer 24, but the signal held from the latch circuit 26 is continuously output as shown in FIG. As shown in FIG. 5C, the mixer 24 continues to output the signal to the medication lamp 21a, and the medication lamp 21a is continuously lit. That is, the chemical liquid detection device 1 does not directly detect the liquid column 121 but captures a phenomenon in which the output from the light receiving element 11b becomes a no-signal state through the output of an intermittent signal shorter than the predetermined interval S. The formation of the pillar 121 is considered.

  Then, as shown in FIG. 6A, when the dropping speed is slowed again, the light receiving element 11b changes from the no-signal state to the signal output state again. Therefore, as shown in FIG. 6B, the reset circuit 27 operates and outputs a reset signal to the latch circuit 26. Upon receiving this reset signal, the latch circuit 26 resets the held signal when the dropping interval becomes shorter than the predetermined interval S, as shown in FIG. Then, when the dropping speed is slowed down again, as shown in FIG. 6 (d), the medication lamp 21a shifts to the blinking state by the intermittent signal that passes through the system directly inputted from the amplifier 23 to the mixer 24.

  Here, when the liquid temperature of the chemical solution 120 is higher than that in the room, the inside of the drip tube 110 is clouded to block light reception between the light emitting element 11a and the light receiving element 11b. However, the latch circuit 26 already holds a signal output to the medication lamp 21a. Therefore, the drug solution detection apparatus 1 can stably turn on the medication lamp 21a while the liquid column 121 is flowing even if the signal becomes unstable due to cloudiness. . That is, in order to detect the liquid column 121, the liquid column 121 itself is not detected, but more specifically, the process in which the liquid column 121 is formed, more specifically, the dropping interval of the chemical 120 is shorter than the constant interval S. By grasping the phenomenon that the light receiving element 11b eventually stops outputting a signal, the medication lamp 21a can be stably lit during the formation of the liquid column 121.

  As described above, the drug solution detection apparatus 1 according to the present embodiment holds the drop locus of the drug solution 120 between the light emitting element 11a and the light receiving element 11b, and is administering the drug solution 120 based on the input of the signal from the light receiving element 11b. Notification is made by a notification unit such as the lamp 21a. Further, when the intermittent signal output from the sensor 11 composed of the light emitting element 11a and the light receiving element 11b becomes shorter than a predetermined interval, a signal input unit that inputs a signal to the notification unit while the signal is not output from the sensor 11 thereafter. Is provided. Thereby, even in an environment in which the drip tube 110 is likely to be clouded, the notification unit can accurately notify the medication to the drug solution 120 that flows down by forming the liquid column 121. Increased reliability.

  The signal input unit may include a latch circuit 26 that holds the signal output state when the intermittent signal output from the sensor 11 becomes shorter than a predetermined interval. Then, a first signal path from the sensor 11 to the notification unit without passing through the latch circuit 26 and a second signal path from the sensor 11 to the notification unit through the latch circuit 26 are provided. The medication may be notified in response to a signal input from at least one of the signal path and the second signal path.

  The voltage converter 25 outputs a voltage signal proportional to the frequency of the intermittent signal output from the sensor 11 to the latch circuit 26 as a set signal. The latch circuit 26 is a voltage based on the intermittent signal shorter than the constant interval S. The signal may be received as a set signal, and the latch circuit 26 may hold the signal output state while no signal is output from the sensor 11.

  In the present embodiment, the case where the liquid medicine detection device 1 includes only the medication lamp 21a has been described. However, the alarm body 20 includes a medication end lamp 21b, a speaker 22a, a volume knob 22b, as shown in FIG. May be further provided. The medication end lamp 21b is turned on when the drug solution 120 is not detected. The speaker 22a outputs a buzzer sound if the chemical solution 120 is not detected for a predetermined time or longer. The volume knob 22b is connected to the variable resistor, changes the resistance value of the variable resistor according to the rotation angle, and adjusts the volume of the buzzer sound.

DESCRIPTION OF SYMBOLS 1 Chemical solution detection apparatus 10 Sensor holder 11 Sensor 11a Light emitting element 11b Light receiving element 13 Insert port 20 Alarm main body 20a String member 21a Dosing lamp 21b Dosing end lamp 22a Speaker 22b Volume knob 23 Amplifier 24 Mixer 25 Voltage converter 26 Latch circuit 27 Reset circuit 30 Adapter 31 Fitting hole 100 Chemical solution bottle 110 Drip tube 120 Chemical solution 121 Liquid column 140 Drip port

To achieve the above object, the chemical liquid detection device according to the present invention is a chemical detector for detecting chemical fall the drip cylinder communicating via a tube in the chemical bottle, the notification unit for notifying the dosage of the chemical If, comprising a sensor for organic light-emitting element and a light receiving element interposing the falling trajectory of the chemical solution, and a signal input unit interposed between the sensor and the notification unit, wherein the sensor, first the signal input unit 1, the signal input unit receives the first signal, inputs the second signal to the notification unit, and the interval of the first signal output from the sensor is greater than a certain interval. The second signal is input to the notification unit while the first signal is not output from the sensor thereafter, and the notification unit outputs the second signal output from the signal input unit. Based on the signal, the medication solution is notified. And, characterized by.

The signal input unit includes a latch unit that retains a signal output state by an input of a set signal that reaches an operating voltage, and the operation when the first signal intermittently output from the sensor is shorter than a predetermined interval. A set signal output means for outputting a set signal reaching a voltage to the latch section; a signal path of a first path from the sensor to the notification section without passing through the set signal output means and the latch section; and the sensor A signal path of a second path from the set signal output means and the notification section to the notification section via the latch section, and the notification section of the signal path of the first path and the signal path of the second path You may be made to alert | report notification of medication corresponding to the said 2nd signal input from at least one of signal paths .

The set signal output means is a voltage converter which outputs a voltage No. signal proportional to the frequency of the intermittent signal output from the sensor before SL latch portion, the latch portion, a voltage signal reaches the operating voltage You may make it receive as a set signal holding a signal output state .

The latch unit may hold the signal output state while the first signal is not output from the sensor.

Claims (7)

A chemical solution detection device for detecting a chemical solution falling in a drip tube communicating with a chemical solution bottle via a tube,
A notifying unit for notifying the medication of the drug solution based on the input of the signal;
A sensor that has a light-emitting element and a light-receiving element that sandwich a drop locus of the chemical solution, and that inputs a signal to the notification unit;
When an interval between signals output from the sensor is shorter than a certain interval, a signal input unit that inputs a signal to the notification unit while a signal is not output from the sensor thereafter,
Providing
The chemical | medical solution detection apparatus characterized by this. The signal input unit is
When the intermittent signal output from the sensor is shorter than a certain interval, a latch unit that holds the signal output state;
A first signal path from the sensor to the notification unit without going through the latch unit;
A second signal path from the sensor to the notification unit via the latch unit;
With
The notifying unit is informing of medication in response to a signal input from at least one of the first signal path and the second signal path;
The chemical | medical solution detection apparatus of Claim 1 characterized by these. A voltage converter that outputs a voltage signal proportional to the frequency of the intermittent signal output from the sensor to the latch unit as a set signal;
The latch unit receives a voltage signal based on an intermittent signal shorter than the predetermined interval as a set signal;
The chemical | medical solution detection apparatus of Claim 2 characterized by these. The latch unit holds the signal output state while no signal is output from the sensor;
The chemical | medical solution detection apparatus of Claim 2 or 3 characterized by these. The notification unit
Be a lamp indicating that medication is in progress;
The chemical | medical solution detection apparatus in any one of Claims 1 thru | or 4 characterized by these. The notification unit
In addition to the lamp indicating that the medication is in progress, a lamp that indicates the completion of medication is provided.
The chemical | medical solution detection apparatus of Claim 5 characterized by these. The notification unit
A speaker that outputs a buzzer sound indicating the end of medication;
The chemical | medical solution detection apparatus of Claim 5 or 6 characterized by these.

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