JPH02286175A - Controller for flow of intravenous drip injection - Google Patents

Abstract

PURPOSE:To exactly feed liquid by providing a setting means to set the size of an intravenous drip and a warning device to output a warning when any one of the size of the intravenous drip, momentary flow and a fluid therapy level in an intravenous drip cylinder is out of a rated value. CONSTITUTION:When parallel light beam L-L is made incident from a projector 15 to an intravenous drip 3a, the beam is condensed by the operation of a spherical lens in the said intravenous drip 3a at the focal point F. When the light receiving surface of a light receiving part 16 is arranged near the focal point F in the case of the intravenous drip for adult, there is large difference in the quantity of light in comparison with a case that the intravenous drip for child is transmitted. Then, as the difference in the quantity of the transmissive light to the intravenous drip, the intravenous drip for adult or child can be detected in a first detector 19. Then, it is discriminated by executing level comparison with a reference signal from a first reference transmitter 21 whether the said intravenous drip is correct or not. When there is a fluid therapy in a reference level 3b, in a fluid therapy level detecting means B, it is detected by the detection signal of a second detector 20 that the fluid therapy level is lowered in case that the level of the liquid is lowered rather than the said fluid therapy level 3b, reaches the fluid therapy level detecting means B and is further lowered although the quantity of the transmissive light from a projector 17 in a photodetector 18 is fixed. Then, a warning signal is outputted from a warning device 37.

Description

[Detailed description of the invention] The present invention detects the amount of liquid fed from the number and amount of drips, controls the amount of liquid fed to be a reference flow rate, and detects when the amount of drips is outside the specified range. This invention relates to an infusion flow rate control device that issues an alarm.

A medical infusion set is used to inject a medical solution into the human body, and is usually constructed as shown in FIG. In FIG. 3, 1 is an infusion bottle containing an infusion 1a and sealed with a stopper 1b, and the infusion set includes the infusion bottle 1, an introduction needle 2, and an infusion W.
i2, an infusion tube 4, a clamp 5, a rubber tube 6, a callus tube 7, and an infusion needle 8, each of which is connected in series. The infusion bottle 1 is suspended on a stand (not shown) and the infusion 1 is
A predetermined water head is given to a. The introduction needle 2 penetrates the stopper 1b and communicates with the infusion, and at the same time, by inserting an air displacement needle (not shown) into the stopper 1b, the infusion drops into the drip tube 3, and the infusion is delivered as a continuous flow from the infusion tube 4. It flows down inside the tube 4. The infusion tube 4 is attached to the fixed clamp 5C of the clamp 5.
and the roller 5b, and the roller 5b axis is inserted into the inclined groove 5a.
By moving up and down along the axis, the infusion liquid is pressed between the fixed clamp 5C and the roller 5b, and the liquid delivery is adjusted to a flow rate corresponding to an arbitrary opening area between the sealed state and the maximum open state. The infusion needle 8 is inserted into a vein and the fluid is delivered to the human body. The octopus tube 7 is for preventing air from flowing into the vein, and the air contained in the infusion is stored in the air reservoir 7a and is prevented from flowing out into the infusion volume 8.

The rubber tube 6 serves as a flexible tube for stably holding the infusion needle 8 in the human body during liquid delivery.

The amount of liquid delivered in the above-mentioned infusion set is a flow rate that is inversely proportional to the water head difference between the water head of the infusion 1a and the venous pressure and the flow path resistance of the infusion tube 4 and the like. Since the volume of intravenous fluid is constant, when the flow rate is high, the number of infusions per unit time is large, and even the flow is continuous, but the flow rate of infusion fluid delivered to the human body is determined by the number of infusions per unit time. Then, the flow path resistance is adjusted using the clamp 5 so that this number of drops is achieved. Further, the amount of intravenous drip is determined for adults and children, and is set at 15'a/mQ for adults and 60 drops/mQ for children. That is, an infusion set for adults is set to be four times as large as the amount of infusion in an infusion set for children.

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In the conventional infusion set described above, the number of infusions per unit time is determined depending on the type of infusion and the medical condition, and the nurse adjusts the clamp, and once the adjustment is completed, the fluid continues to be delivered in that state. A problem arises in that the amount of infusion changes depending on the patient's posture and the decrease in the water head of the infusion 1a. Further, even if the number of droplets per unit time is set, if an infusion set for adults is accidentally used for children, there is a risk that the amount of infusion will be four times as large.

The present invention for μ divination has been made in view of the problems in performance.
Second, the set flow rate determined based on the number of drips per unit time of a certain amount is maintained at the set value until immediately before the completion of the drip, and secondly, an alarm is issued when the number of drips deviates from the set value. thirdly, to issue an alarm if the adult or child's infusion set is not the preset adult or child's infusion set; and fourth, to notify that the infusion has been delivered. The purpose of this system is to send out a safety alert to notify the user of the infusion, and its gist is to use an infusion sensor and an infusion sensor that detect the size of the infusion that is dripped out from the infusion container. An infusion tube equipped with a level sensor that detects the level, an instantaneous flow rate converter that calculates the infusion volume from the dripping time interval and the size of the infusion, a flow 11 setting device that sets the reference flow rate, and the reference flow rate. A control circuit that compares the instantaneous flow rate with the instantaneous flow rate and sends a control signal so that the instantaneous flow rate becomes a reference flow rate, a clamp that changes the infusion tube circulation area based on the signal from the control circuit, and sets the size of the infusion. The present invention provides an infusion flow rate control device that is equipped with a setting means for controlling the infusion volume, and an alarm device that issues an alarm when any of the size of the infusion, the instantaneous flow rate, and the level of infusion in the infusion barrel deviates from a specified value.

Fig. 1 is a block diagram for explaining an embodiment of the infusion flow rate control device according to the present invention. , the octopus tube 7, and the infusion needle 8 are the same as those in the infusion set shown in FIG. The drip tube 31 and clamp 51 are the drip tube 3 shown in FIG.
, the clamp 5 functions as follows in the present invention. Part A of the drip tube 31 surrounded by a chain line is an optical means for detecting the drip, and 15 is a light projecting part that projects light from a light source (not shown) onto the light receiving part 16, and an optical signal generated every time the drip is dropped. Detect. Part B is an optical detection means for detecting the level of the infusion in the drip tube 31, and is composed of a light projecting part 17 and a light receiving part 18, and is installed at a position below the infusion level 3b during normal use. Therefore, when the infusion level 3b is higher than the infusion level detection means B, it is determined to be normal, and when it is lower than the infusion level detection means B, it is determined to be abnormal, and the details will be described later. As mentioned above, there are two types of infusion cents: one for adults and one for children, and the amount of infusion for adults is 1.
m Q / 15, 1 m Q / 60 for children 0 Assuming that the drip is a sphere, the diameter of the drip for adults is 5.0 m
+n, 3.21 for children. 10 surrounded by a dotted line shows the configuration of the drip flow rate control device, and 19 is the light receiving part 1.
This is a detector that detects optical information regarding the dripping and size of the infusion obtained in step 6 as an electrical signal. The adult set button 25 or child set button 26 is set by the operator, and by pressing the corresponding button, a switch (not shown) that is switched in conjunction with this button changes the size of the IV drip for adults or children V. The first reference transmitter 21 transmits a reference signal corresponding to the reference signal. Reference numeral 22 denotes a first comparison discriminator that compares the respective signals of the first reference transmission Wt21 and the detector 19 and determines whether the comparison value is approximately equal to the specified value or not; When it's different! An abnormality alarm signal is sent from the alarm 23.

28 is a time measuring circuit that detects the time T from when the infusion signal of the detector 19 is detected until the next infusion signal is transmitted. 29 is a flow rate calculation control circuit, and the first reference transmitter 21
The infusion flow is determined from the flow rate V of the infusion for adults or children transmitted from the infusion and the infusion interval time T! #, Q is calculated, and the real axis liquid flow f
In addition to displaying this on the f1Q display 24, the clamp 51 is activated to press the infusion tube 4 and adjust the size of the flow path area so that the infusion flow rate Q becomes the desired flow JiQo set in the flow rate setting device 30. This controls the infusion flow rate. The clamp 51 holds the infusion tube 4 between a fixed clamp and a movable clamp (not shown).
The movable clamp is pressed against the fixed clamp by an actuator (not shown) that is activated in proportion to the control signal of the flow rate calculation control circuit 29, and the method is not limited to the above embodiment, and other methods may be used. Any one can be used. 31 is a second comparison/discrimination circuit which compares the set flow rate Qo outputted from the flow rate setting device 30 and the actual flow rate Q outputted from the flow rate calculation control circuit 29, and when the comparison difference exceeds the reference value, an alarm 32 is activated. It sends out a warning signal and notifies you of an abnormality.

On the other hand, the infusion level detection means B of the infusion level 3b in one drip tube 31 transmits a transmitted light signal from the light receiving section 18 through which the infusion has passed, to the detector 20, where it is photoelectrically converted.

36 is a third comparison/discrimination circuit that determines whether or not the infusion level is within the specified value, and when the 1#i liquid level 3b is lower than the specified value, there is a risk of air getting into the infusion needle 8. The alarm 37 issues a warning.

Next, the principles of the drip detection means in section A and the infusion level detection means in section B of the drip flow rate control device will be explained. First, the drip detection means in part A detects the size of the drip and the interval between drops. This was done in consideration of its effectiveness, and as shown in FIG.
When the parallel rays L-L from the infusion droplet 3a enter the infusion droplet 3a, they are condensed at a focal point F by the spherical lens action of the infusion droplet 3a. By arranging the light receiving section 16 near the focal point F, a drip detection signal with a large amount of light can be obtained. Since the distance #lf from the drip 3a to the focal point F is a small distance, the amount of light decreases rapidly when the position of the light receiving section 16 shifts. Therefore, when the light-receiving surface of the light-receiving unit 16 is arranged near the focal point F when an adult's infusion is used, there is a large difference in the amount of light when a child's infusion is transmitted, and the first detector 19 The reference signal from the first reference transmitter 21 and the level can be switched by pressing the adult set button 25 or the child set button 26. By comparing, it can be determined whether the corresponding drip is correct or not. Another method of determination is to determine whether the drip tube 31 is for adults or children and attach the drip detection means A corresponding to each of them.Whether the attached drip tube 31 matches any of the setting buttons 25 and 26. It is also possible to detect whether In the above description, the size of the drip is detected optically, but the passage time of the drip immediately after dropping may be detected optically, which is shown in FIG. 3(b). (b) is the passage time of the adult IV drip 'rM, (
B) shows the passage time Tc of a child's drip, and the child's drip passage time Tc can be sufficiently determined at about 60% of the adult's drip passage time TM.

In addition, when the infusion is at the reference level 3b, the amount of light transmitted from the light emitter rr17 to the receiver 18 is constant, but when the infusion level is lower than the infusion level 3b, the infusion level detection means B If the infusion level reaches that level and further decreases, the detection signal of the second detector 20 becomes an intermittent signal, and it is possible to detect a drop in the infusion level, and the infusion signal of the first detector 19 and the second detector 20
The signals are compared by a third comparison/discriminator 36, and when a matching signal is obtained, it is considered dangerous and a warning signal is sent from an alarm device 37.

1. According to the infusion flow rate control device of the present invention, issues concerning the use of an infusion set can be controlled from the time when the operator first applies the infusion set to the patient. It notifies you of any abnormalities throughout the process until the fluid delivery is complete, so you don't have to constantly go around to detect abnormalities like with conventional infusion cellars, and you can deliver fluids accurately. .

[Brief explanation of the drawing]

Fig. 1 is a block diagram for explaining an embodiment of the infusion flow rate control device of the present invention, Fig. 2 is a diagram for explaining operation, and Fig. 3 is a diagram for explaining an example of a conventional infusion set. It is. 1... Infusion bottle, 2... Introducing needle, 3.31... Drip tube, 4... Infusion tube, 5.51... Clamp,
7... Octopus tube, 8... Infusion needle, 10... Infusion flow rate control device, A: Infusion detection means, B: Liquid level detection means. Patent applicant Oval Equipment Industry Co., Ltd. Figure (a) (b) Figure

Claims (1)

[Claims] 1. An infusion barrel equipped with an infusion sensor that drips the infusion drawn from the infusion container, detects the size of the infusion dripped, and a level sensor that detects the infusion level, based on the dripping time interval of the infusion and the size of the infusion. an instantaneous flow rate converter that calculates an infusion volume, a flow rate setting device that sets a reference flow rate, and a control circuit that compares the reference flow rate with the instantaneous flow rate and sends a control signal so that the instantaneous flow rate becomes the reference flow rate. , a clamp for varying the flow area of the infusion tube based on a signal from the control circuit, a setting means for setting the size of the infusion, and a setting means for setting the size of the infusion, the instantaneous flow rate, and the infusion level in the infusion tube to a specified value. 1. A drip flow rate control device comprising: an alarm device that issues an alarm when disconnection occurs.