JPH0562254U - Infusion set - Google Patents

Abstract

(57) [Summary] [Purpose] To be able to accurately detect the occlusion pressure downstream of the pump of the infusion set, and to shorten the operation time of the occlusion alarm. [Arrangement] An air trap 3 is provided on the downstream side of an infusion pump consisting of a finger type drive unit 5, and a bellows portion 3a is provided on the air trap 3, and the bellows portion 3a is displaced by a closing pressure.
The closing pressure is measured by detecting the displacement by the photocoupler 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an infusion set for injecting a drug solution into a blood vessel of a living body.

[0002]

[Prior Art]

 In order to inject a drug solution into a blood vessel of a living body from a drug solution bottle as a container for containing the drug solution, a rotary type or a peristaltic type pump is usually used. However, if the infusion tube on the downstream side of the pump is clogged or the tip of the injection needle is in close contact with the blood vessel wall of the living body, the drug solution may not be delivered into the blood vessel. In order to detect such blockage on the downstream side of the pump, conventionally, an expansion displacement of the infusion tube is detected, or a special diaphragm is installed in the infusion set to detect the displacement of this diaphragm, and an alarm is issued. I was trying to emit.

[0003]

[Problems to be solved by the device]

 However, when detecting the expansion displacement of the infusion tube, there is a problem that if the material of the infusion tube is hard, there are few changes and it is not possible to accurately detect a wide range from low pressure to high pressure with respect to the closing pressure. In addition, if the material of the infusion tube is soft, the displacement at the time of blockage is large and the alarm activation time becomes long.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an infusion set capable of accurately detecting a closing pressure downstream of a pump and shortening an operation time of a closing alarm. With the goal.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the infusion set of the present invention is an infusion set in which a drug solution contained in a container is injected into a blood vessel of a living body by means of a pressure-feeding means. And a displacement detecting means for detecting displacement of the chemical liquid storing means.

[0006]

[Action]

 According to the infusion set having the above-described configuration, when the blockage occurs in the pipeline on the downstream side of the pressure feeding means, the drug solution storing means is displaced by the injection pressure of the pressure feeding means. At this time, by making the material of the chemical liquid storage means softer than the material of the other pipeline, the chemical liquid storage means is displaced before the pipeline is displaced. Further, since the chemical solution storage means can obtain a large displacement, the detection accuracy can be improved.

[0007]

【Example】

 An embodiment of the infusion set of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, a drug solution bottle 1 which is a container containing a drug solution is attached to a stand (not shown) with the inlet facing down, and a drip tube 2 is connected to the inlet of the drug solution bottle 1. The bottom of the drip cylinder 2 and the bottom of the air trap 3 above the liquid medicine bottle 1 as a liquid medicine storage means are connected by a tube 4 which is a conduit. In the middle of the tube 4, a finger type drive unit 5 as a pressure feeding means is provided.

The upper portion of the air trap 3 has a bellows shape and is elastically expandable and contractable in the direction indicated by the arrow XX. In addition, the bottom of the air trap 3 is connected to the other end of an infusion tube 6 whose one end is connected to a blood vessel of a living body. Further, the infusion tube 6 is provided with a bubble sensor 7. Here, the material of the bellows portion 3a of the air trap 3 is softer than the material of the material forming the tube 4 and the infusion tube 6.

Photocouplers 8a, 8b, 8c as three-stage displacement detecting means are provided at positions outside the outer periphery of the bellows portion 3a above the bellows portion 3a of the air trap 3. . The photocoupler 8 is composed of light emitting elements 9a, 9b, 9c and light receiving elements 10a, 10b, 10c, which are provided to face each other on the outer diameter of the bellows portion 3a. When, for example, a pressure of 100 mmHg is applied to the bellows portion 3a, the bellows portion 3a is displaced to a position where it blocks the optical path A of the lowest photocoupler 8a and an alarm is issued. Similarly, when a pressure of 250 mmHg or 400 mmHg is applied to the bellows portion 3a, the bellows portion 3a is displaced to a position where it blocks the optical paths B and C of the photocouplers 8b and 8c, respectively.

Next, the operation of this embodiment will be described. For example, when injecting a drug solution into a vein, the photocoupler 8a is set to operate. At this time, if the patient-side conduit on the downstream side of the air trap 3 is occluded, the pump injection pressure of the finger type drive part 5 causes the bellows part 3a to expand and displace as shown in FIG. Shut off the alarm to give an alarm and stop the infusion at the same time.

Similarly, when injecting a drug solution into an artery, if the photocoupler 8c is set to operate, the bellows portion 3a expands and displaces due to the blockage of the conduit, and the optical path C of the photocoupler 8c is blocked. By doing so, an alarm is issued and the injection is stopped.

According to the present embodiment, the occlusion pressure can be changed in three stages depending on the purpose of use of the infusion set, and for example, the pressure at which an alarm is issued can be changed depending on whether a drug solution is injected into a vein or an artery. . Further, the operation time of the blockage alarm can be shortened, and the risk of bolus injection can be avoided by weakening the contraction force of the bellows portion 3c. In particular, it is possible to increase the displacement of the bellows portion 3a and improve the detection accuracy.

In the above embodiment, the case where the photocoupler 8 has three stages has been described, but it is not limited to three stages. Further, as shown in FIGS. 3 and 4, one end of a lever 12 whose middle portion is rotatably supported by a fulcrum 11 is connected to the upper portion of the bellows portion 3a of the air trap 3, and the other end is circularly slid. The displacement of the bellows portion 3a may be converted into a voltage by sliding it on the resistor 13. Further, as shown in FIG. 5, the fulcrum 11 of the lever 12 is linearly movable along the slide rail 14, one end of the lever 12 is connected to the upper end of the bellows portion 3a, and the other end is a linear sliding resistance 13 It may be slid on. According to each of the above configurations, the closing pressure can be continuously detected. The liquid storing means also has a function of capturing the air mixed in the drug solution and not sending the air into the blood vessel.

The pressure feeding means is not limited to the finger type driving section 5.

[0016]

[Effect of the device]

 As described above, according to the infusion set of the present invention, the displacement detection means is provided by providing the expandable and contractible chemical liquid storage means in the downstream pipe line of the pumping means, and using the closing pressure on the downstream side as the displacement position of the chemical liquid storage means. Since the detection is performed by the method described above, it is possible to obtain a large displacement position with respect to the closing pressure and improve the detection accuracy.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of an embodiment of an infusion set of the present invention.

FIG. 2 is an explanatory view showing the operation of FIG.

FIG. 3 is an explanatory diagram showing a configuration of a main part of another embodiment of the present invention.

FIG. 4 is an explanatory view showing the operation of FIG.

FIG. 5 is an explanatory diagram showing the configuration of another embodiment of the present invention.

[Explanation of symbols]

 1 Chemical Solution Bottle (Container) 3 Air Trap (Chemical Solution Storage Means) 4 Tube (Pipe Line) 5 Finger Type Drive Unit (Pressure Feeding Means) 8 Photocoupler (Displacement Detection Means)

Claims (1)

[Scope of utility model registration request] 1. In an infusion set for injecting a drug solution contained in a container into a blood vessel of a living body by using a pumping means, an expandable and contractable drug solution storing means is provided in a conduit line on the downstream side of the pumping means, and the drug solution. An infusion set comprising a displacement detecting means for detecting displacement of the storage means.