JP2002191692A - Drip infusion monitoring device and drip infusion monitoring control device equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drip infusion monitoring device and a drip infusion monitoring control device capable of miniaturizing a drip infusion detecting part detachable on a drip infusion cylinder and a control part and reducing weight thereof, strong against disturbance light, and easily adjusting infusion speed, setting and recognizing a remaining time of the drip infusion, and recognizing liquid drip drop in the drip infusion cylinder, and convenient to be carried, and capable of preventing from giving unpleasant feeling to surroundings by alarm sound accompanied by abnormal infusion speed. SOLUTION: A lens of the drip infusion detection part is miniaturized and the light is refracted so as to miniaturized the drip infusion detection part and reduce the weight thereof. Further a circuit for modulating the light to irradiate in the drip infusion cylinder and receiving and demodulating the light is provided. The drip infusion detection part is detachable on the control part. Further, a level indicator for displaying the infusion speed is provided. The infusion remaining time at the drip infusion is calculated and displayed. A light emitting diode is lighted at a timing the liquid drip dropping in the drip infusion cylinder. An infusion total volume value and unit volume value of the liquid drip are read by a bar code reader. The alarm sound stops at a prescribed time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drip monitoring device for detecting a drop falling in a transparent drip tube and a drip monitoring control device provided with the same.

[0002]

2. Description of the Related Art A drip detecting unit 85 of a conventional drip monitoring device is used.
As shown in FIG. 9 viewed from the front corresponding to the axial direction of the drip tube 8 and FIG.
The drip tube 8 is irradiated with parallel light by a light emitting element 81 (light emitting diode, semiconductor laser, etc.) and a lens 82,
The light that has passed through is collected by a lens 83, and the collected light is received by a light receiving element 84 (such as a photodiode or a phototransistor). And light receiving element 84
Was arranged on the same axis on a plane parallel to the diameter direction of the drip tube 8. Further, the detection range w for irradiating and condensing the parallel light onto the drip tube 8 can be detected even when the dropping place of the drip changes, so that the cross-sectional diameter of the drip tube 8 with respect to the diameter direction of the drip tube 8 It was necessary to set the range to cover about a or more. As shown in FIG. 11, when the light emitting element 81 is driven by a direct current, the falling time interval of the plurality of droplets is measured according to the timing at which the droplet passes through the irradiation range w of the parallel light. Light receiving element 84
A signal waveform V11 having a peak obtained by voltage-converting the signal current from the comparator is compared with a predetermined voltage Vref,
The time intervals t1, t2,... Of the generation timing of the rising edge or the falling edge of the square wave signal V12 converted into the digital signal. . . From the above, the infusion rate was determined, and this was displayed and controlled. In addition, when the adjustment of the drop time interval of the droplet is manual, the adjustment is performed while looking at the displayed value of the infusion rate. Further, when the infusion rate deviates from a predetermined set value range, a warning sound is issued simultaneously with the blinking display by the visible light emitting element to notify an infusion operator or the like of the infusion rate abnormality. The infusion operator confirms the end time of the infusion by checking the total infusion amount of the infusion bag 71 connected to the infusion tube 8, the unit amount of the droplet falling in the infusion tube 8, and the infusion speed immediately after the start of the infusion. Is input using a numeric keypad or the like provided in the infusion monitoring device or the infusion monitoring control device, and the time during which the infusion bag 71 becomes empty is calculated and displayed. Further, the infusion detection unit 85 is only connected to a control unit that measures and displays the infusion rate by a signal cable.

[0003]

In the above prior art, when a light emitting diode is used as the light emitting element 81 as shown in FIG. 10, the light irradiation angle range θ in which a sufficient amount of light is emitted from the light emitting diode is: 30 from the center of the light emitting surface
In order to convert this irradiation light into parallel light having a range w covering the cross-sectional diameter a of the drip tube, the lens 82
The focal length f must be equal to or larger than the cross-sectional diameter a of the drip tube 8, and a light emitting diode must be provided at the focal point f. With respect to the drip tube 8, the length d of the drip detection unit 85 in the optical axis direction is several times the cross-sectional diameter a of the drip tube 8 and becomes larger and heavier, so that the drip tube 8 is greatly inclined or shaken. Infusion bag 71 to which tube 8 is connected
A fixing arm for fixing the drip detecting unit 85 is required so as not to be disengaged from the device, and this causes a problem that the device becomes heavier and larger, making it difficult to carry and handle.

When the shape of the lenses 82 and 83 is circular with respect to the plane perpendicular to the optical axis, and the irradiation and detection range of the parallel light to the drip tube 8 is a circle having the diameter w, the drip tube 8 The drop time interval of droplets falling inside is long,
When only one droplet exists in the detection range w, the falling time interval can be measured as the rising edge or the falling edge of the square wave signal V12 shown in FIG. As shown in FIG. 13, when the drop time interval of the droplet is short and a plurality of droplets exist in the detection range w, the peak of the signal V11 corresponding to the passage timing of the droplet attenuates as shown in FIG. ,
Assuming that the timing at which a droplet enters the detection range w and the timing at which a droplet already within the detection range w exits the detection range w are the same, a droplet that always blocks parallel light within the detection range w Is constant, the signal V11 has a flat waveform with no peak, and the signal V11 cannot be compared with the initially set predetermined reference voltage Vref, so that the falling time interval cannot be measured. FIG.
As shown in FIG. 4, when noise is superimposed on the signal V11 due to disturbance light or noise, a fine square wave due to the noise is generated in the signal V12, and there has been a problem that the falling time interval cannot be accurately timed.

[0005] In addition, in order to visually confirm whether or not the infusion rate displayed by the infusion monitor is normal, the droplets falling in the infusion tube 8 can be visually checked as shown in FIG. Is not completely covered by the drip detecting unit 85 (a portion indicated by a thick dotted line in FIG. 9), so that when disturbance light enters the light receiving element 84 from here, a signal obtained from the light receiving element 84 is output. There is also a problem that the peak waveform of the signal V11 cannot be compared with the predetermined reference voltage Vref because the signal V11 obtained by converting the current into a voltage has an offset voltage, so that accurate time measurement of the falling time interval cannot be performed. Further, there is also a problem that even if an attempt is made to visually confirm the drop timing of the liquid drop to see if the infusion rate displayed by the drip monitoring device is accurate, it is difficult to visually recognize the liquid drop if it is a transparent body.

Further, the warning about the drop time interval abnormality of the drip is issued when the fall of the measured drop time interval falls outside a predetermined fixed set value range.
There is also a problem that the set value range cannot be set according to various infusion conditions.

In the case where the infusion rate is adjusted manually by using a clamp or the like 73 which can be adjusted by inserting the infusion tube 72 flowing out of the drip tube 8, the infusion rate obtained by the infusion monitor is used. The adjustment was performed while watching, and there was a problem that the adjustment was difficult.

When the infusion monitor is used in a room such as a hospital where a plurality of patients share a room, the infusion tube 72 connected to the infusion tube 8 in the middle of the infusion is bent or the clamp 7 is used.
In the case where the infusion rate changes and a warning is issued due to an adjustment deviation of 3 or the like, a warning sound is conventionally continuously generated, and there is also a problem that a person other than the patient during the infusion is extremely uncomfortable.

The infusion operator confirms the end time of the infusion by checking the total infusion amount of the infusion bag 71 connected to the infusion tube 8, the unit amount value of the droplet falling in the infusion tube 8, and immediately after the start of the infusion. The infusion speed of the infusion bag is input using a numeric keypad or the like provided in the infusion monitoring device or the infusion monitoring control device, and the time during which the infusion bag 71 is empty is calculated and displayed.
When the infusion rate during the infusion is different from the infusion rate immediately after the start of the infusion due to the bending of the infusion tube 72 or the misalignment of the clamp 73 during the infusion, the infusion bag 71 is emptied again. The remaining amount of the bag 71 and the like must be entered and calculated using the numeric keypad or the like, which is very troublesome.

Further, when the drip detection unit 85 is connected to the control unit only by a signal cable, when the drip detection unit 85 and the control unit are carried, the drip detection unit 85 is accidentally dropped or the signal cable is pulled. There was also the problem of disconnection.

According to the present invention, the above-mentioned conventional disadvantages are eliminated, the size of the drip detecting unit detachably attached to the drip tube and the control unit can be reduced, and the drip detecting unit is resistant to disturbance light. Provided are a drip monitoring device and a drip monitoring control device that are easy to carry and that can easily confirm and confirm dropping of a droplet in a drip tube. In addition, the present invention provides an infusion monitoring device and an infusion monitoring control device that do not cause discomfort to the surroundings due to a warning sound accompanying an infusion speed abnormality.

[0012]

According to the present invention, in order to solve the above-mentioned problems, according to the first and second aspects of the present invention, a drip detecting unit is reduced in size and weight and can be used for drip or the like without a support member. Light irradiation that irradiates light parallel to the axis of the drip tube so that it can be attached, and even if the drop time interval of the droplets is short, it is possible to reliably detect each and every droplet. Means, first light bending means for bending the light in the diameter direction of the drip tube, and second light bending for bending the light passing through the drip tube again in parallel with the axial direction of the drip tube. Means and light bent by the second light bending means,
Light receiving means for receiving light; the light irradiating means includes a light emitting element; and a first lens for converting light emitted from the light emitting element into parallel light. A second lens that condenses the parallel light that has passed through the first and second lenses, wherein the first and second lenses have different shapes in vertical and horizontal widths with respect to a plane perpendicular to the optical axis; The second light bending means is a plane reflecting mirror disposed at a predetermined angle with respect to the axial direction of the drip tube.

According to the third aspect of the present invention, even if disturbance light enters the light receiving element, the light emitted from the light emitting element can be measured with a light intensity in order to accurately time the falling time interval. Modulated light emitting means for modulating at a predetermined frequency as a strength, current-voltage converting means for current-to-voltage conversion of a signal taken out as a light-receiving current through the light-receiving element, and a band for shaping and demodulating the waveform of the voltage-converted signal A pass filter, a low-pass filter, a demodulating circuit including a demodulating circuit and an amplifying circuit, and comparing a fluctuation of a demodulated signal caused by a plurality of droplets falling in the drip tube with a predetermined voltage, to a comparison result. Comparing means for converting the signal into a high-level or low-level digital signal,
A monostable multivibrator circuit which captures the rising or falling edge of the compared digital signal and outputs it as a digital signal for measuring a falling time interval of a square wave having a predetermined time width; It is characterized by comprising arithmetic and control processing means for measuring a time interval of occurrence of a rising edge or a falling edge of a signal, and an arithmetic and control processing means for measuring an average value by measuring the measured falling time interval a plurality of times. I have.

According to the fourth aspect of the present invention, it is possible to visually confirm whether the infusion rate obtained from the infusion monitoring device is accurate and to determine the drop timing of the droplets. It is characterized by comprising a visible light emitting element for confirming a drop, and a light emitting means for confirming a drop of the liquid drop for lighting the visible light emitting element for confirming a drop of the liquid drop according to the digital signal for measuring the time of the falling time interval.

According to a fifth aspect of the present invention, there is provided an operating means capable of operating the arithmetic control processing means, so that the infusion rate abnormal range can be arbitrarily set according to the conditions of the infusion.
A storage unit that can store a plurality of values that store an upper limit and a lower limit that can be arbitrarily set by this operation; and the arithmetic control processing unit that compares the infusion rate with the upper limit and the lower limit. As a result, if the infusion rate is larger than the upper limit or smaller than the lower limit,
Warning means for giving a warning.

In the invention according to claim 6, in the case of a manual adjustment method using a clamp or the like, in order to simplify the adjustment, the infusion rate is set to a predetermined value between the upper limit value and the lower limit value. The apparatus is characterized by comprising: the arithmetic control processing means for determining where in a range divided by an integer of 2 or more, and a level indicator indicating a position of an infusion rate in the divided range.

In the invention according to claim 7, when the infusion monitoring device is used in a room such as a hospital where a plurality of patients share a room, the infusion tube connected to the infusion tube in the middle of the infusion is bent or the cleansing device is used. When the infusion rate changes and a warning is issued due to misalignment of the buzzer, the buzzer sounds at a predetermined time after the warning is issued so as not to cause discomfort to anyone other than the patient during the infusion It is characterized by:

According to the invention described in claim 8, even when the infusion speed during the infusion is different from the infusion speed immediately after the start of the infusion, the infusion bottle or bag corresponding to the infusion speed during the infusion is always empty. To calculate the time
A drop number counting means for counting the number of square waves of the digital signal for drop time interval timing generated by dropping a plurality of drops as a drop number of the drop, and a drop number count value obtained by the drop number counting means And the total infusion amount value of the infusion bottle or bag containing the infusion connected to the infusion tube stored in the storage means, the unit amount value of the droplet falling in the infusion tube, and the infusion speed determined during the infusion. The apparatus is characterized by comprising the arithmetic control processing means for obtaining the remaining time until the infusion of the infusion bottle or bag during the drip becomes empty, and the display means for displaying the remaining time.

According to the ninth aspect of the present invention, when the drip detecting section is connected to the control section only by a signal cable, the drip detecting section and the control section are carried out when the drip detecting section is carried. The drip detecting unit and the control unit are provided with detachable means that can be detached from each other so that the unit is not accidentally dropped or the signal cable is pulled and disconnected.

In the invention according to claim 10, in order to prevent the total infusion amount of the infusion bottle or bag and the unit amount value of the droplet falling in the infusion tube from being input to the infusion monitoring device, A barcode attached to the infusion bottle or bag, a barcode attached to the infusion tube including the infusion tube, a barcode reader connected to an infusion monitoring device that reads these barcodes, and an output from the barcode reader. Storage means for storing the total infusion amount value and the unit amount value of the droplet falling in the drip cylinder in association with the value to be given.

According to a twelfth aspect of the present invention, there is provided an infusion amount control means for controlling the number of droplets falling in the drip cylinder per unit time to a predetermined number based on the infusion speed. I have.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of the drip detecting unit 7 attached to the drip tube 8. FIG. 2 is a top view of FIG. A light-emitting diode (hereinafter, referred to as an LED) 1 that emits light in the axial direction of the drip tube 8 includes the
Lens 2 for converting light emitted from ED1 into parallel light
A plane reflecting mirror 3 for bending the light in the diameter direction of the drip tube 8; a plane reflecting mirror 4 for bending the light passing through the drip tube 8 again in parallel with the axis of the drip tube 8; Mirror 4
A lens 5 for condensing the light bent by the above, and a photodiode (hereinafter referred to as PD) 6 for receiving the condensed light are provided. A resistor for converting a signal current from the PD 6 into a voltage and an amplifier circuit 14 are incorporated.

The lens 2 and the lens 5 are a lens having a circular shape with respect to a plane perpendicular to the lens optical axis, and a vertical width w1 and a horizontal width cut symmetrically with respect to a plane perpendicular to the lens optical axis. w2 is a lens having a different shape, whereby the detection range w1 in the axial direction of the drip tube 8 to which light is irradiated is about the size of a droplet falling in the drip tube, and the diameter direction of the drip tube 8 The detection range w2 is large enough to cover the cross-sectional diameter a of the drip tube, and even if the drip tube is inclined or the falling time interval of the liquid enemy becomes short, it is possible to reliably detect each droplet. In addition, since the lens shape is reduced, the size and weight can be reduced.

Next, the circuit configuration and operation of the control unit 52 will be described. FIG. 3 is a circuit configuration of the control unit 52 including the drip detecting unit 7, and FIG. 4 is a diagram showing signal waveforms of V1 to V7 shown in FIG. First, the oscillation circuit 31 generates a square wave signal V1 having a predetermined frequency of several tens of kHz,
Is driven. Accordingly, the LED 1 emits the light whose frequency is modulated at the frequency of several tens of kHz and which repeatedly changes in intensity. This modulated light is received by PD6,
The light receiving current obtained from D6 is converted into a voltage by a resistor and transmitted to the control unit 52 as a signal V2 amplified by the amplifier circuit 14. At this time, the signal V2 has an attenuated waveform because the liquid droplets that have fallen in the drip tube 8 block the parallel light irradiated into the drip tube 8.

After passing through a band-pass filter 15 for removing the influence of disturbance light other than the modulation frequency of the signal V2 transmitted to the control unit 52, the signal V2 becomes a signal V3 amplified by the amplifier circuit 16. Demodulation circuit 1 for demodulating signal V3
The modulation frequency is removed from the signal input to 7 and passing through the low-pass filter 18, and becomes a signal V4 having a peak as the liquid drops pass. Further, the signal V4 is amplified by the amplifier circuit 19 to become a signal V5, which is input to the comparator 20. The signal V5 is compared with a predetermined reference voltage Vref by the comparator 20, and is converted into a square wave digital signal V6 corresponding to the vicinity of the peak of the signal V5 (the passage timing of the droplet in the drip tube). Further, since the signal V6 is not affected by noise, it is input to the monostable multivibrator circuit 21, and is converted into a signal V7 having a predetermined time width tm from the rising edge of the signal V6.

The signal V7 is a visible light LED 2 for confirming the drop of the droplet.
4 is driven. The visible light LED 2 for confirming the drop of the droplet according to the timing of the drop of the droplet in the drip tube 8
4 blinks, and the drop of the droplet can be confirmed visually.

A microcomputer (hereinafter referred to as an MPU) 35 built in the control section 52 for performing various arithmetic and control processes.
Incorporates a plurality of input / output interfaces, a ROM for storing an operation program, a RAM for storing a plurality of values used for arithmetic processing, and an EEPROM for storing various parameters that can be electrically erased and rewritten. The MPU 35 has a buzzer drive circuit 25 for issuing a warning and a buzzer 2 connected to the buzzer drive circuit 25.
6 and visible light LED 27 for warning confirmation for issuing a warning
And the operation of the blinking light emission drive circuit 28, the liquid crystal display device 29 for displaying the infusion speed and the remaining time of the infusion, the counter 30 for counting the number of square waves of the signal V7 as the number of drops of the droplet, and the MPU 35. A plurality of operation switches 33 for performing the operation, a battery checker 34 for detecting the remaining amount of the circuit battery, an external interface circuit 32 for controlling the drip control unit and reading the value of the barcode reader are connected, and the signal V7 is MPU3
5 and the liquid transfusion rate 29 is displayed on the liquid crystal display device 29 by calculating the time average of the time intervals t1, t2,... Of the rising edge of the signal V7.

Hereinafter, the operation of the infusion monitoring apparatus will be described with reference to the flowchart of FIG. First, in step S101, the MPU 35 reads and sets programs and various parameters stored in the ROM. Next, in step S102, input / output ports are initialized and the counter 30 is set to zero. In step S103, the liquid crystal display device 29 is initialized. In step S104, the upper limit value, the lower limit value, the total infusion amount value of the infusion bag, and the unit amount value of the droplet falling in the infusion tube 8 are read from the EEPROM. In step S105, the MPU 35 reads the output of the battery checker 34 and checks the remaining amount of the circuit battery.

In step S106, the MPU 35 first determines a predetermined time tn which is a loop counter by a program.
The value of the time counting parameter that counts up by +1 each time and the value of the edge number counting parameter h that counts the number of rising edges of the signal V7 are set to zero. Then, the timing parameter starts counting up, and in parallel with this, the MPU 35 starts measuring, and every time the MPU 35 detects a rising edge of the signal V7, the value of the edge number counting parameter h is incremented by +1. Up. At this time, the value of the timing parameter reaches a predetermined value (that is, whether a predetermined time has elapsed), or the value of the edge number counting parameter h becomes a predetermined value (an integer of 2 or more). When reached, end the measurement. During the measurement, the MPU 35 detects the value m of the time measurement parameter when detecting the first rising edge of the signal V7.
And the value n of the timing parameter when the last rising edge is detected is stored in the RAM. In step S106, except for the above-described process of counting up the time-counting parameter for each predetermined time tn, all the processes are performed by interrupt processing. However, since these processing times are extremely short with respect to time tn, the measurement error is ignored. it can.

In step S107, if the value of the edge number counting parameter h is 2 or more, the MPU 35 determines the infusion rate c by calculating c = (h-1) / [(nm) × tn] ( In this embodiment, the number of drops per second is obtained.) If h is 1 or less, the infusion rate c = 0. Through the above processing, an average value of (h-1) times of the infusion rate is obtained.

In step S108, the MPU 35 compares the infusion rate c with the upper limit value and the lower limit value, and as a result of the comparison, when the infusion rate c is larger than the upper limit value or smaller than the lower limit value. , Buzzer drive circuit 25
, And a buzzer 26 emits a warning sound. At the same time, the MPU 35 sends an enable signal to the blinking light emission drive circuit 28 and blinks the visible light LED 27 for warning confirmation. Further, the MPU 35 measures the time since the alarm sound of the buzzer 26 is issued by the loop counter for measuring the buzzer generation time according to the program, and sends a disable signal only to the buzzer drive circuit 26 when the predetermined time is reached, Sound 26 stops.

As a result of the comparison, the MPU 35 finds that the infusion rate c
Is less than or equal to the upper limit value and the lower limit value, a disable signal is sent to the buzzer drive circuit 25 and the blinking light emission drive circuit 28 to stop the buzzer sound and blinking light emission.

When the clamp 73 is used as an infusion pump, the MPU 35 controls the infusion pump through the external interface circuit 32 so that the infusion speed is reduced if the infusion speed c is larger than the upper limit value. It is possible to send a control signal to the infusion pump so that the infusion speed increases if the speed c is smaller than the lower limit value, and does nothing if the infusion speed c is equal to or less than the upper limit value and equal to or greater than the lower limit value. it can. The generation of the disable signal for the buzzer generation time counting loop counter and the buzzer drive circuit 25 in step S108 is performed by interrupt processing, and the program immediately proceeds to step S109 even when the buzzer 26 emits a warning sound. Transition.

In step S109, the MPU 35 first sets the upper limit value to r and sets the lower limit value to s.
The range divided by the above integer u is obtained. In this embodiment,
The range between r and s was set to the following range, which was almost equally divided. S
Above [(rs) / u + s], [(rs) × 2 /
u + s] or more and less than [(rs) × 3 / u + s],.
[(R−s) × (u−1) / u + s] or more and r or less. In addition to these ranges, a range in which a warning is issued is provided in a range less than s and greater than r. The visible light LEDs corresponding to the above range are arranged in a line in order from the smaller value range as a level indicator, and the visible light LEDs corresponding to the range including the infusion rate c are turned on.

In this embodiment, in step S111, a level indicator is used as shown in FIG. 6 to display a plurality of characters arranged in one line on the liquid crystal display device 29. The divided range is indicated by a black square, and the position of the infusion rate c is indicated by a white square.

In step S110, the MPU 35 reads the count value j of the counter 30 that counts the number of square waves of the signal V7 as the number of drops of the droplet into the RAM. Based on the total infusion amount G of the infusion bag 71 containing the infusion connected to the infusion tube 8, the unit amount b of the droplet falling in the infusion tube 8, and the infusion speed c, the infusion bag 71 in the middle of the infusion is determined. The remaining time tr until empty becomes tr =
It is obtained by the calculation of (G−b × j) / (b × c).

In step S111, the MPU 35 sets the value obtained by the above-described measurement and calculation processing to the infusion rate c in the portion 61 of the liquid crystal display device 29 shown in FIG. The remaining time tr is displayed in the portion, and the mark B is displayed in the portion 64 when the battery level is low as a result of the battery check.

Step S112 is performed in an interrupt process.
By operating the plurality of operation switches 33, the program jumps to step S113. Step S
At 113, the MPU 35 inputs the upper limit value r, the lower limit value s, the total infusion amount value G, and the unit amount value b of the droplet falling in the drip tube by the plurality of operation switches 33. In this embodiment, the operation switches are composed of three push switches, each of which is a selection switch, an up switch, and a down switch. Each time the selection switch is pressed, the display of the liquid crystal display device 29 displays the upper limit r, the lower limit s, By switching between the infusion total amount G and the unit amount b of the liquid droplet, and pressing the up button and the down button in each display, each numerical value can be increased or decreased. The changed value is written to the EEPROM. Further, as shown in FIG. 7, a bar code 74 attached to the infusion bag 71 and an infusion tube 72 connected to the drip tube 8.
A bar code 75 attached by a seal or the like to a bar code reader (not shown) for reading these bar codes, and this bar code reader are connected to the external interface circuit 32 of the control unit 52 of the infusion monitoring apparatus, The MPU 35 stores the infusion total amount G in association with the value of the bar code 74 and the unit amount value b of the droplet in association with the value of the bar code 75 in the EEPROM, and stores these values in the MPU 35. Can be read and the remaining time tr until the infusion bag 71 becomes empty can be obtained.

Next, FIG. 5 is an external view of the device of the drip detecting unit 7 and the control unit 52 of this embodiment. The drip detecting section 7 is connected to the control section 52 by a signal cable 55, and includes detachable sections 53 and 54 which can be detached from each other.

It is needless to say that the inventions described in claims 3 to 12 are not limited to the infusion detection units described in claims 1 and 2 in this embodiment. The invention according to claims 3 to 12 may be applied to a conventional drip detecting unit. Also,
The light bending means may be a prism or an optical fiber. Further, the warning means may use the external interface circuit 32 to notify the drip operator of a warning by a wireless device or a wired device. Further, the drip detecting unit 7 may be integrated with the control unit 52. Also, the present invention may be applied to a syringe pump, wherein the infusion speed is a feed speed of a motor for driving the syringe pump.

As described above, according to the present invention, the drip detecting unit which can be detachably attached to the drip tube and the control unit can be reduced in size and weight, it is resistant to disturbance light, the infusion speed can be adjusted, and the remaining time of the drip can be reduced. Provided is a portable drip monitoring device and a drip monitoring control device that can be easily set and checked, and that a drop of liquid in a drip tube is easily checked. In addition, the present invention provides an infusion monitoring device and an infusion monitoring control device that do not cause discomfort to the surroundings due to a warning sound accompanying an infusion speed abnormality.

[Brief description of the drawings]

FIG. 1 is a front view showing a drip detecting unit according to an embodiment of the present invention.

FIG. 2 is a top view showing the drip detecting unit in the embodiment.

FIG. 3 is a circuit configuration diagram of a drip detecting unit and a control unit in the embodiment.

FIG. 4 is a diagram showing operation waveforms of the circuit in the embodiment.

FIG. 5 is a diagram showing an outer shape of the apparatus according to the embodiment.

FIG. 6 is a diagram showing a display on the display device in the embodiment.

FIG. 7 is a diagram in which the infusion monitoring device according to the embodiment is attached to an infusion tube.

FIG. 8 is a diagram showing a flowchart of a program in the embodiment.

FIG. 9 is a front view showing a drip detecting unit in a conventional example.

FIG. 10 is a top view showing a drip detecting unit in the conventional example.

FIG. 11 is a diagram showing operation waveforms of the circuit in the conventional example.

FIG. 12 is a diagram illustrating a state of a droplet detection unit and a droplet in the conventional example.

FIG. 13 is a diagram showing operation waveforms of the circuit in the conventional example.

FIG. 14 is a diagram showing operation waveforms of the circuit in the conventional example.

[Description of Signs] 1 ... Light-emitting diode, 2 ... Lens, 3 ... Plane reflecting mirror, 4
... a plane reflecting mirror, 5 ... a lens, 6 ... a photodiode, 7 ...
Drip detection unit, 8: drip tube, 11: drive circuit, 14: amplifier circuit, 15: band-pass filter, 16: amplifier circuit,
17 demodulation circuit, 18 low-pass filter, 19 amplifying circuit, 20 comparator, 21 monostable multivibrator circuit, 23 driving circuit, 24 visible light emitting diode for confirming droplet drop, 25 buzzer driving circuit, 26 ...
Buzzer, 27: visible light emitting diode for warning confirmation, 28
... Flashing light emission drive circuit 29 ... Liquid crystal display device, 30 ... Counter, 31 ... Oscillation circuit, 32 ... External interface circuit, 33 ... Operation switch, 34 ... Battery checker, 35 ... Microprocessor unit, 51 ... Hole for hanging control unit , 52: control unit, 53: detachable unit, 54:
Attaching / detaching part, 55: signal cable, 71: infusion bag, 72
… Infusion tube, 73… clean, 74… barcode,
75 bar code, 81 light emitting diode, 82 lens, 83 lens, 84 photodiode, 85 drop detection unit,

Claims (12)

[Claims] 1. A drip detecting unit of a drip monitoring device for detecting a droplet falling in a light transmissive drip tube, and a light irradiating means for irradiating light parallel to an axis of the drip tube; First light bending means for bending light in the diameter direction of the drip tube;
Second light bending means for bending the light having passed through the drip tube again parallel to the axis of the drip tube, and light receiving means for receiving the light bent by the second light bending means And a drip monitoring device. 2. The light irradiating means includes a light emitting element and a first lens for converting light emitted from the light emitting element into parallel light, and the light receiving means includes a light receiving element and the light passing through a drip tube. The first and second lenses are configured to have different vertical and horizontal widths with respect to a plane perpendicular to the optical axis, and the first and second lenses are configured to collect parallel light. 2. The drip monitoring device according to claim 1, wherein the light bending unit is a plane reflecting mirror disposed at a predetermined angle with respect to an axial direction in the drip tube. 3. A modulated light emitting means for modulating light emitted from the light emitting element at a predetermined frequency as a light intensity, and a current-to-voltage conversion for current-to-voltage conversion of a signal taken out as a light receiving current through the light receiving element. Means, a band-pass filter for shaping and demodulating a voltage-converted signal, a demodulating means comprising a low-pass filter, a demodulating circuit and an amplifying circuit, and demodulation caused by a plurality of drops falling in the drip tube. Comparing means for comparing the variation of the signal thus obtained with a predetermined voltage and converting the signal into a high-level or low-level digital signal based on the comparison result; and capturing a rising or falling edge of the compared digital signal to obtain a predetermined signal. Monostable multivibrator output as a digital signal for measuring the falling time interval of a square wave with a time width of Path, arithmetic control processing means for timing the time interval of the rising edge or the falling edge of the digital signal for falling time interval timing as the falling time interval of the plurality of droplets, and a plurality of the timed falling time intervals. And an infusion rate per unit time (the number of drops per second or the number of drops per second) from the measured drop time interval average value and the unit amount value of the droplet. 3. The infusion monitoring device according to claim 1, further comprising: the arithmetic control processing unit that converts the amount as an infusion amount, and a display unit that displays the amount per unit time. 4. 4. A visible light emitting element for visually confirming that a droplet has fallen in the drip tube, and a visible light emitting element for confirming that the droplet has fallen by means of the digital signal for measuring the falling time interval. The liquid drop monitoring device according to claim 3, further comprising: a light emitting unit for confirming a drop of the liquid drop that turns on the visible light emitting element. 5. An infusion monitoring apparatus comprising: an operation unit capable of operating the arithmetic control processing unit; and a storage unit capable of storing a plurality of values for storing an upper limit and a lower limit arbitrarily set by the operation unit. And, the arithmetic and control processing means for comparing the infusion rate with the upper limit value and the lower limit value, and as a result of the comparison, if the infusion rate is greater than the upper limit value or smaller than the lower limit value, a warning is issued. The drip monitoring device according to claim 3, further comprising a warning unit that performs the operation. 6. The arithmetic and control unit for determining where the infusion rate is located in a range divided by an integer of 2 or more between the upper limit and the lower limit, and The infusion monitor according to any one of claims 3 to 5, further comprising a level indicator indicating a position of the infusion speed in a range. 7. The warning means comprises a blinking display of a visible light emitting element for warning confirmation and a warning sound by a buzzer, and the warning sound by the buzzer stops sounding for a predetermined time after the warning is issued. The infusion monitoring device according to claim 5 or 6, wherein 8. A drop number monitoring means for counting the number of square waves of the digital signal for drop time interval counting generated by dropping of a plurality of drops as the number of drops of a drop, The drop count value obtained by the drop count means and the total infusion value of the infusion bottle or bag containing the infusion connected to the drip cylinder, which is stored in the storage means, and the unit amount of the drop falling in the drip cylinder The arithmetic control processing means for calculating the remaining time until the infusion bottle or bag infusion during the infusion becomes empty from the value and the infusion rate obtained during the infusion, and the display means for displaying the remaining time. The infusion monitoring device according to claim 3, wherein: 9. The drip monitoring device comprises the drip detection unit connected by a signal cable and the control unit according to claim 3 to 8. The drip detection unit and the control unit are detachable from each other. 2. An attaching / detaching means.
9. The infusion monitoring device according to any one of items 1 to 8. 10. A bar code attached to the infusion bottle or bag, a bar code attached to the infusion tube including the infusion tube, a bar code reader connected to an infusion monitoring device that reads these bar codes, 4. A storage means for storing the total infusion amount value and a unit amount value of a droplet falling in the drip cylinder in association with a value output from a barcode reader. 9. The infusion monitoring device according to any one of items 1 to 8. 11. An infusion monitoring device comprising the features of claims 3 to 10, not limited to the infusion detection unit having the features of claims 1 and 2. 12. An infusion monitoring control device, comprising: an infusion amount control means for controlling the number of drops in the infusion tube per unit time to a predetermined number based on the infusion speed.