JPH0584340U - Drip flow rate display - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the size and weight of the drip flow rate display device and simplify its operation. A drip cylinder of different types depending on the volume of the liquid drop is attached to the recess 4, the number of liquid drops per unit time in the drip cylinder is detected, and the drip flow rate is calculated from the number of the liquid drops and the volume, and the display unit In the drip flow rate display device 1 shown in 3, the drip tube selection switch 2 for selecting the type of the attached drip tube is provided, and the drip tube selection switch 2 and the power switch of the device are integrated. And drip flow rate display device.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drip flow rate display device used for drip flow rate adjustment work during infusion therapy in a hospital or the like.

[0002]

[Prior Art]

 In general, it is necessary to precisely adjust the flow rate when injecting various liquids such as drug solution, blood and physiological saline into a vein. Since the abnormal increase or decrease in the flow rate may be life-threatening for the patient, care must be taken in setting the flow rate. For this reason, a large drip monitoring device that has an automatic adjustment function for clemme and automatically monitors the flow rate of the drip and the amount of the drip until the end of the drip, and notifies the watchman such as a nurse of the end of the drip. Is proposed. However, since this device is a very expensive and large machine, it is difficult to introduce it in a general hospital, and even if it is introduced, the number of patients cannot keep up with the number of patients. Used a watch and a stopwatch to count the number of drops in the drip tube per unit time while adjusting the drop flow rate with a manual clamp. However, since the nurses count small droplets while keeping an eye on the clock, it was time consuming and time-consuming for accuracy and for the nurses.

In addition, in the drip tube, the volume of one drop of liquid ejected from the nozzle of the drip cylinder varies depending on various conditions such as the patient and the liquid medicine to be injected. For example, 1 ml (15 drops / cc) of 15 drops depending on the diameter of the nozzle. ), There is a drip tube that makes 60 ml to 1 ml (60 drops / cc). In order to deal with these, in the conventional drip monitoring device, a dip switch for selecting a drip tube is provided in addition to the power switch, and the conditions of each drip tube are input. This also contributes to the increase in size of the conventional drip monitoring device, and since the number of operation switches increases and the work increases, the operation becomes complicated.

[0004]

[Problems to be solved by the device]

 The present invention has been made with the object of providing a drip flow rate display device that solves the problems of the prior art as described above.

[0005]

[Means for Solving the Problems]

 The drip flow rate display device according to the present invention is achieved by the following configuration. That is, it is attached to a drip tube of a different type depending on the volume of the liquid drop, the number of liquid drops per unit time in the drip cylinder is detected, and the drip flow rate is calculated from the number of liquid drops and the volume of the liquid drop, The drip flow rate display device to be displayed is provided with a drip tube selection switch for selecting the type of the installed drip tube, and is characterized in that the drip tube selection switch and the power switch of the device are integrated. It provides a low-cost, small-sized, and easy-to-use drip flow rate display device as compared to the conventional expensive and large drip monitoring device.

The integrated switch in which the drip tube selection switch and the power switch are integrated in the present invention can use, for example, a tact switch (contact type switch). When the integrated switch is pressed, power is supplied to the internal circuit, and thereafter, it functions as a drip tube selection switch. By further pressing this integrated switch, the type of drip cylinder, for example, 60 drops / cc or 15 drops / cc can be selected depending on the amount of time that the switch is kept pressed. Further, instead of selecting the drip tube by the amount of time that the integrated switch is kept pressed, the integrated switch may be pressed multiple times and the drip tube may be selected from the number of times. By thus combining the drip tube selection switch and the power switch, the size can be reduced, and the number of operation switches can be reduced, which simplifies handling.

Further, the drip flow rate display device according to the present invention comprises a liquid drop detecting means for detecting a liquid drop by the change of the light sent from the light emitting part, and the liquid drop detecting means falls in the drip tube. The droplet is recognized by the scattering of the luminous flux that occurs when the droplet traverses the luminous flux from the light emitting unit, the interval to the next droplet is detected, and the flow rate per unit time is calculated and displayed by the calculation based on them. With this configuration, the drip flow rate can be measured in a short time, and the drip rate adjustment work can be performed accurately in a very short time, compared to the method that has conventionally relied on a clock or stopwatch. become.

In addition, in order to confirm whether or not the liquid droplets have been reliably detected, it may be configured such that the user is alerted at the same time when the liquid droplets are recognized by using a piezoelectric buzzer or the like to generate a sound.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited thereto.

FIG. 1 is a perspective view showing the external appearance of the device of the present invention, and FIG. 2 is a cross-sectional view of the essential parts showing the usage state of the device.

The housing 1 of the device is of a size that can be carried by a nurse in a pocket or the like, and has a recess 4 at the center, to which a drip tube is attached. Further, as shown in FIG. 6, it is possible to provide a clip member 26 for fixing the drip tube, if necessary. The housing 1 is provided with a switch 2, which is an integrated switch in which a drip tube selection switch and a power switch are integrated. The display unit 3 displays the measured drip flow rate. The unit is generally [ml / h], which indicates how many ml flowed per hour. Also, the type of drip tube selected at the same time is displayed.

As shown in FIG. 2, a light emitting portion 5 and a light receiving portion 6 are provided so as to surround the recess 4, and the transparent tubular portion 7 of the drip tube mounted in the recess 4 is emitted from the light emitting portion 5. The transmitted light passes and reaches the light receiving unit 6. At this time, when the droplet 9 passes through the tubular portion 7, the droplet 9 blocks the light flux from the light emitting portion 5, so that the light reaching the light receiving portion 6 is scattered and reaches the light receiving portion 6. The drop is recognized and the passage of the droplet is recognized.

FIG. 3 is a block diagram illustrating an electric circuit of the device of the present invention. The light emitting section 5 is made to blink in a pulse form by the blinking signal 18 from the microcomputer 8. The gate 11 is opened in synchronization with the blinking signal 18, and the light receiving signal from the light receiving unit 6 is taken in only when the gate 11 is opened, so that external noise other than when light is emitted is not affected by external noise. A device can be provided. As described above, the droplet recognizing method is based on detecting the scattering of the light flux (decrease in the arrival amount of the light flux) that occurs when the liquid droplet falling in the drip cylinder crosses the light flux from the light emitting unit 5. The received light signal of the droplet is formed into a waveform through a peak hold circuit 12, a filter 13, an amplifier 14 and a comparator 15 described later, and a droplet pulse 17 is formed as the droplet passes. The droplet pulse 17 is input to the microcomputer 8.

FIG. 4 is a flow chart showing a process in which the microcomputer 8 receives the droplet pulse 17 and calculates the drip flow rate. As for the drip flow rate, the timer built in the microcomputer 8 is started at the Nth drop (N is an integer of 1 or more), and the timer is stopped at the N + 1th drop. Start, stop the timer at the N + 2nd drop, find the average drop time between 3 drops from the time value measured by the timer and the timer, and calculate the mode value of the corresponding drip cylinder, that is, 15 drops / cc or 60 drops / It is calculated from the reciprocal of the product of cc and is displayed on the display unit 3 every time three drops pass.

Next, turning on / off (ON / OFF) of the power of the device of the present invention will be described. When the switch 2 is pressed, the transistor 25 (Tr ₂ ) and the transistor 24 (Tr ₁ ) are turned on one after another, and accordingly each circuit is connected to the power supply (shown as being connected to the circuit power supply 23 in FIG. 3). At the same time, the reset signal 20 is applied to the microcomputer 8 through the differentiating circuit 22. When the reset signal 20 is applied, the micro computer 8 starts from the initial program and confirms whether the power is on or off. That is, it is confirmed whether or not the power is on when the switch 2 is pressed.

FIG. 5 is a flowchart regarding confirmation of power ON / OFF when the switch 2 is pressed. When the power is not turned on, the content of the specific address of the RAM in the microcomputer 8 is a random value. Therefore, the hold signal 19 is issued based on this and the power ON state is maintained, and the RAM is turned on. The specific address value of is rewritten to a specific value (for example, 00 00). When the power is on, the specific address of the RAM has been rewritten to the specific value (0000), so the hold signal 19 of FIG. 3 is cut off, and the power supply is cut off accordingly.

The switch 2 also supplies a drip tube selection signal 21 to the microcomputer 8. In the present invention, when the switch 2 is pressed as described above, the hold signal 19 is output when the power is turned off to on, and Tr ₁ is turned on to connect the circuit (circuit power supply 23) and the power supply 10. At this time, the voltage of the drip tube selection signal 21 becomes the “H” level, and if the microcomputer 8 confirms the drip tube selection signal 21 several seconds after the power is turned on, if the drip tube selection signal 21 is still at the “H” level. That is, if the switch 2 is continuously pressed, it is determined that the drip tube of 60 drops / cc is attached. If the switch 2 is released before the confirmation by the micro computer 8, the voltage of the drip tube selection signal 21 becomes "L" level, and it is judged that the drip tube of 15 drops / cc is attached. The microcomputer 8 determines the arithmetic constant according to the state of the drip tube selection signal 21, and displays the selected drip tube and the flow rate.

Further, when the power is turned on, the auto power off timer is started. For example, if the power switch 2 is not turned off within 3 minutes, the microcomputer 8 automatically changes the hold signal 19 and Tr ₁ It also has a function to turn off the power and automatically turn off the power.

Further, the device of the present invention drives the piezoelectric buzzer 16 every time the microcomputer 8 receives the droplet pulse 17 formed by the above-mentioned droplet reception signal, so that the device ejects the droplet. It also has the function of letting the user know that he / she is correctly recognized.

[0020]

[Effect of the device]

 As described above, in the drip flow rate display device according to the present invention, since the power can be turned on / off and the type of the drip tube can be identified with a single switch, the drip flow rate display device is smaller and lighter than conventional ones, and can be carried around. The operation is easy, and anyone can easily see the display and set the drip flow rate, so the adjustment work can be completed in a very short time, leading to labor saving for nurses. In addition, in a drip monitoring device, a droplet may not be recognized due to a slight deviation in angle when mounted on a drip tube.However, conventional drip monitoring devices recognize all droplets and correct It was not possible to confirm whether or not the flow rate was calculated, which made the user feel uneasy, but the device of the present invention drives the piezoelectric buzzer each time a droplet pulse is received, so the user can feel secure and correct. The flow rate can be adjusted.

[Brief description of drawings]

FIG. 1 is an external view of a drip flow rate display device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional top view showing the usage state of FIG.

3 is a block diagram showing an electrical circuit of the apparatus of FIG.

FIG. 4 is a flowchart illustrating a drip flow rate calculation operation in the apparatus of FIG.

5 is a flow chart for explaining a program start operation in the apparatus of FIG.

FIG. 6 is an external view of a drip flow rate display device provided with a clip member according to an embodiment of the present invention.

[Explanation of symbols]

1 housing 2 switch 3 display section 4 drip tube mounting recess 5 light emitting section 6 light receiving section 7 drip tube 8 microcomputer 9 droplet 10 battery 11 gate 12 peak hold circuit 13 filter 14 amplifier 15 comparator 16 piezoelectric buzzer 17 droplet reception signal (droplet pulse) 18 blink signal 19 hold signal 20 reset signal 21 drip chamber selection signal 22 the differential circuit 23 the circuit power supply 24 transistor (Tr ₁₎ 25 transistor (Tr ₂₎ 26 drip chamber retention clip member

Claims (1)

[Scope of utility model registration request] 1. A drip tube of different types depending on the volume of the liquid drop, the number of liquid drops per unit time in the drip tube is detected, and the drip flow rate is calculated from the number of the liquid drops and the volume of the liquid drop. In a drip flow rate display device for calculating and displaying, a drip tube selection switch for selecting the type of the drip tube attached is provided, and the drip tube selection switch and the power switch of the device are integrated. Flow rate display device.