JPS58188459A - Drip control apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for controlling the number of droplets in a drip tube during infusion or blood transfusion. In normal infusions and blood transfusions, the flow rate is adjusted by manual setting of roller clamps installed in the infusion and blood transfusion lines, but since the economical flow rate fluctuations are large, inotropic agents, vasopressors, or antihypertensive agents are used in postoperative management. It cannot be used for constant seminal fluids that require constant dosing without fluctuations, such as those that require constant dosing without fluctuations.

Although there are some known inventions related to devices for controlling the number of drops in the drip tube for dispensing such purified liquid, none of them are of practical use, and even if the device is designed for two-way use, Although it is possible to control the total number of drops within the transfusion time, the drop interval becomes uneven and downtime occurs, making it impossible to perform constant transfusion.

The present invention solves the above-mentioned drawbacks and provides a drop number control device with extremely small errors and fluctuations in the total infusion time with respect to the preset value of the drop number.Examples of the present invention will be described below with reference to the drawings. do.

As shown in FIG. 1, the present invention is to control the number of drops per unit time in a drip tube 3 to a constant level by controlling a pump means 2 installed in the middle of a normal infusion or blood transfusion line 1. As the means, it is preferable to use a roller pump or a finger pump as disclosed in US Pat. No. 3,083,647, which can transport liquid by moving the pressure-closing position from the outside of the blood transfusion or infusion line.

As shown in Fig. 2, the pump means 2 is controlled by dividing the clock pulse from the clock generator by a frequency divider, and transmitting the divided clock pulse to the remaining time counter, which calculates the calculated remaining time. Daunkaran]
- From the signal T and the remaining drop count signal N, which is calculated by transferring the set drop number (A drops/time) signal transferred from the preset switch to the preset counter to the remaining drop count down counter via a full adder. Calculated T/N-Z
+ double signal next droplet interval), that is, the next droplet interval at the next cycle time, is compared with the time/A=Z signal (reference interval) from the preset counter and the deviation coefficient △Z is calculated. , the deviationist △Z
is converted into a voltage or the sum of voltage and duty ratio by a converter and transmitted to the pump drive motor. A drop detection signal from a sensor that detects drops in the drip tube of an appropriate type such as ultrasonic method or ultrasonic method is transferred to the remaining drop count down counter, and the content of the remaining time down counter becomes zero. The difference between the set number of drops (A drops/hour) and the actual number of drops/time is calculated every time the cycle changes, and the total adder adds the difference to the set number of drops (A drops/hour). This value is corrected at the next cycle time as a preset value for the remaining drop count down counter.When using a device that generates pulsation, such as the roller pump or finger pump described above, as a pumping means, use a pump to prevent pulsation. It is preferable to add a smoothing circuit to the drive circuit of the pump motor to quickly drive the pump motor during the suspension period of liquid feeding.

Since the present invention is configured as described above, the difference between the actual number of drops at the end of each cycle time and the set number of drops (A drops/hour) is added to or subtracted from the next cycle time. Since the correction is made, when the cycle time is set to about 60 seconds, steady infusion without variation can be practically performed throughout the entire time.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view showing the state of use, and FIG. 2 is a block diagram of the control circuit. Patent applicant: 1) Hideo

Claims (1)

[Claims] A. A clock pulse from a clock generator is divided by a frequency divider, and the divided clock pulse is transferred to a remaining time down counter to calculate remaining time count signals T and B. T is calculated from the set drop number (A drops/hour) signal transferred from the set switch to the preset counter and the remaining drop count signal N, which is calculated by transferring the signal to the remaining drop count down counter via the full adder. /N
= Z, signal (next drop interval) and C0 time from said preset counter/A = Zo
The comparator calculates the deviation above △Z, and the voltage is transferred to the falling drop detection signal from the sensor or the remaining drop count down counter by the converter. The difference between the set number of drops (A drops/hour) and the actual number of drops/time is calculated for each cycle time of the remaining time down counter, and the total adder converts the difference into the set number of drops (A drops/hour). The number of remaining drops is counted down. A droplet number control device, wherein the droplet number control device is corrected at the next cycle time as a preset value of the droplet number.