JPH07222798A - Transfusion set and medicinal liquid injecting device using the same - Google Patents

Abstract

PURPOSE:To inject a medicinal liquid at a specified speed into a human body by providing a medicinal liquid flow tube with an opening/closing means and a flow rate control part for controlling a medicinal liquid injection rate. CONSTITUTION:This transfusion set is composed of a balloon part (a) and the medicinal liquid flow tube (b). The balloon part (a) has a balloon 1 of a flat shape into which the medicinal liquid is housed to a pressurized state. This balloon 1 has a medicinal liquid outflow port 3 and a medicinal liquid inflow port 4 on its opposite sides. The medicinal liquid inflow port 4 is provided with a plug body consisting of a rubber-like elastic material for inflow of the medicinal liquid into the lumen and is so formed that the medicinal liquid is injected by pricking of the pricking needle of an injector. The medicinal liquid outflow port 3 consists of a flexible tube. A breaking member which is the rigid opening/closing means 11 having a brittle site is inserted therein. The medicinal liquid flowing out of the balloon 1 is injected into the human body from the pricking needle or catheter connected to a connecting means 8 via the flow rate control section 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infusion set for injecting a prescribed amount of medicinal solution into the body and a medicinal solution injecting device using the same, and more particularly, a medicinal solution stored under pressure in a balloon. The present invention relates to an infusion set capable of injecting into a patient at a constant rate and a drug solution injecting device using the same.

[0002]

2. Description of the Related Art Conventionally, when injecting a drug solution contained in a bag into a human body, a patient lying on a bed has been controlled while adjusting a drug solution injecting rate by a roller clamp using a head difference. . In recent years, it has become necessary to gradually inject liquid medicines such as antibiotics, anti-cancer agents, and anesthetics into blood vessels, bladders, etc. over 10 hours or more, and development of a portable ambulatory infusion set has been demanded. As an infusion set in response to such a request,
There is known a device (Japanese Patent Laid-Open No. 4-67873) in which a drug solution is contained in a balloon made of an elastic material and the contraction force of the balloon is used to continuously inject the drug solution into the human body. The infusion set described in this publication is shown in FIGS. 6 and 7. FIG. 6 is an overall explanatory view of the infusion set, showing a state in which the puncture needle has not punctured the plug body of the housing, and FIG. 7 shows when the balloon of the housing shown in FIG. 6 is filled with the drug solution. It is an expanded sectional view showing the state. The infusion set shown in FIGS. 6 and 7 has a balloon portion e formed of a housing 43 that houses the balloon 42.
And a chemical liquid flow tube section f having a flow rate control unit 44 for adjusting the flow rate of the chemical liquid. The balloon 42 has a rod-shaped inner shaft 45 shown in FIG. 7, a cylindrical outer shaft 46 slidably mounted on the inner shaft 45, and an outer shaft 46 which is one end of the inner shaft 45. Side inner side bearing 47 formed integrally with the inner shaft at the end opposite to the inner side, and the inner shaft 45 and the outer shaft 46 are provided outside these shafts so as to cover them, and one end thereof is the inner shaft.
A balloon 42 made of an elastic material is closely fixed to 45 and the other end is closely fixed to the outer shaft 46. Also housing 43
An adapter-48, which is a chemical liquid inflow / outflow portion, is formed at one end of the inner side of the inner surface of the inner shaft 45 and communicates with the liquid chemical passage 51 through the inside of the inner shaft 45.
A stopper 49 is installed at the end of the drug solution passage 51, and when the drug solution flows into the balloon 42, the drug solution is injected by an injection needle 50 to
6 punctures the stopper 49 when the drug solution flows out from the inlet 42, the drug solution is supplied from a puncture needle (not shown) provided in the connector 52 at the end of the drug solution flow tube part f. It has a structure that is injected into the human body.

[0003]

[Problems to be Solved by the Invention]
The inner and outer shafts are provided inside the balun to allow the chemical solution to flow out at a constant pressure without significant deformation of the balun.
The valve is deformed along the central axis in the long axis direction, and an inner bearing is provided at the end of the inside of the ball so that the ball is deformed along the inner wall of the housing. However, since such an infusion set is provided with such a mechanism inside the balloon, miniaturization of the housing is naturally limited, and there is a problem in injecting the drug solution while the patient carries it. Further, since this infusion set is a mechanism for connecting the puncture needle installed at the end of the drug solution distribution tube to the balloon and injecting the drug solution into the human body, the valve and the drug solution distribution tube are connected to each other. Since they are managed separately, it is difficult not only for hygiene but also for adjusting the rate of injecting the drug solution into the human body. Furthermore, since this infusion set allows the chemical solution to flow out only by the internal pressure of the balloon, when the chemical solution in the balloon becomes low,
There has been a problem that the outflow rate of the chemical liquid decreases when the internal pressure of the liquid decreases. The inventors of the present invention have conducted extensive studies to solve such problems, and as a result, have found that the balloon and the chemical liquid distribution tube during the conventional use.
The problem of the present invention can be solved by using an infusion set that has been connected to a tube and injecting a medicinal solution into a human body as an infusion set in which a balloon and a medicinal solution circulation tube are integrated in advance. And has reached the present invention. Further, according to the present invention, when it is difficult to inject the liquid medicine into the human body at a constant infusion rate only by the contraction force of the balloon filled with the liquid medicine, a pressure higher than the pressure of the balloon filled with the liquid medicine is applied. This is a drug solution injector that can inject a drug solution into a human body with a simple mechanism by providing a mechanism for adding the drug solution to the human body.

[0004]

That is, the present invention relates to a balloon having a chemical liquid inlet for storing a chemical liquid under pressure and having a chemical liquid flow in and a chemical liquid flow outlet for letting a chemical liquid flow out. In a transfusion set comprising a chemical liquid flow tube extending from the chemical liquid flow outlet, an opening / closing tool for flowing or closing the chemical liquid in the chemical liquid flow tube, and a flow rate control unit for controlling the chemical liquid injection speed. , And an injection needle or a connector for connecting with a catheter.

The present invention also provides the above-mentioned infusion set,
It is an infusion set in which the opening / closing tool comprises a breaking member or a three-way stopcock. Further, the present invention is the above-mentioned infusion set, wherein the balloon material is made of elastic rubber or thermoplastic resin. Furthermore, the present invention is the above-mentioned infusion set, wherein a metering valve is provided on the upstream side of the drug solution in the flow rate control unit. Further, the present invention provides the infusion set, wherein the metering valve comprises an orifice body made of a rubber-like elastic body having a valve hole whose inner diameter is deformable, and an adjusting means for adjusting the inner diameter of the valve hole. is there. Furthermore, the present invention is the above-mentioned infusion set, wherein the balloon has a flat shape. Furthermore, the present invention provides the infusion set as described above, wherein the infusion set has a valve inside the housing.
And a pressurizing mechanism for pressurizing the balloon at a pressure higher than the pressure of the balloon filled with the chemical liquid. Further, the present invention is the above-mentioned chemical liquid injector, wherein the pressurizing mechanism uses a spring or a pressurized gas.

[0006]

According to the infusion set of the present invention, the inside of the balloon is pressurized by filling the inside of the balloon with the medicine from the medicine inlet, and then the opening / closing tool installed in the medicine circulating tube is opened. , The drug solution in the balloon flows from the drug solution outlet of the balloon into the drug solution flow tube, and while the injection rate into the human body is controlled to be constant by the flow rate control unit, the puncture needle connected to the connector or A medical fluid is injected into the human body from the catheter. The present invention also provides the infusion set,
By compressing the balloon from the outside of the balloon which is filled with the chemical liquid and expanded by the pressure mechanism larger than the pressure of the balloon, the chemical liquid in the balloon is supplied with the chemical liquid. It is infused into the patient while being controlled at a constant infusion rate via a flow rate control unit installed in the chamber.

[0007]

EXAMPLES Examples of the infusion set of the present invention and a drug solution injecting apparatus using the same will be described below with reference to Examples. 1 is an explanatory view of an embodiment of the infusion set of the present invention, and FIG. 2 is an enlarged cross-sectional view of a balloon portion when the balloon of FIG. 1 is filled with a drug solution,
FIG. 3 is an explanatory view of the vicinity of the flow rate control unit in which a metering valve is arranged on the drug solution upstream side tube of the flow rate control unit, and FIG. 4 is an enlarged cross-sectional view of the balloon section of the drug solution injection device using the infusion set of the present invention. Figure,
FIG. 5 is an enlarged cross-sectional view of a balloon portion of a drug solution injector showing another embodiment of the drug solution injector using the infusion set of the present invention, and FIG. 6 is a drug solution described in JP-A-4-67873. FIG. 7 is an overall explanatory view of the injection device, and FIG. 7 is an enlarged cross-sectional view showing a state when the balloon of the housing shown in FIG. 6 is filled with a chemical solution.

In the drawing, a is a balloon portion, b is a chemical liquid flow tube portion, 1 is a balloon, 2 is a housing, 3 is a chemical liquid outlet, 4 is a chemical liquid inlet, 5 is a flow rate control portion, 6 is a breaking member,
7 is a chemical flow tube, 8 is a connecting tool, 9 is a spring, 10 is a metering valve, 11 is an opening / closing tool, 12 and 60 are pressing members, and 13 is air.
Bag, 14 is a three-way stopcock, 37 is a filter, 30 is an orifice body, 31 is a valve hole, 32 is a cylindrical body, 33 is a plug body, 34 is a female screw part, 35 is a male screw part, and 36 is a cap. Show the body.

FIG. 1 is an explanatory view of an embodiment of an infusion solution set of the present invention, which is composed of a balloon portion a and a liquid medicine distribution tube b. As shown in FIG. 2, the balun portion a has a liquid medicine outlet 3 and a liquid medicine inlet 4 formed on opposite sides of a flat shaped balloon 1 in which the liquid medicine is contained and is in a pressurized state. ing. The medicinal solution inlet 4 is provided with a medicinal solution inflow stopper 15 made of a rubber-like elastic material in its inner cavity, and the medicinal solution is injected into the balloon 1 by being pierced by a puncture needle of a syringe containing the medicinal solution. As the chemical liquid inflow plug 15,
Synthetic rubber such as silicone rubber and butyl rubber, natural rubber and the like can be mentioned. The puncture needle has good puncture resistance, and is a bar under pressure.
It is better to prevent the leakage of chemicals in the tank. Although the flat balloon 1 is used in FIGS. 1 and 2, it may have a cylindrical or spherical shape with one end closed.
The cylindrical balloon has a structure capable of expanding not only in the radial direction but also in the longitudinal direction. The balloon 1 can be used in various sizes and wall thicknesses according to the amount of drug solution to be injected into a patient, the time of injection, etc., and is not particularly limited in the present invention.

The chemical liquid outlet 3 is preferably installed at a position facing the side of the bag in which the chemical liquid inlet 4 is installed,
It consists of a flexible tube 16 which is glued or glued to the edges of the balloon 1. A rigid breaking member 6 having a fragile portion 17 is inserted into the flexible tube 16 to prevent the chemical solution in the balloon 1 from flowing out to the chemical solution circulation tube 7. . Breaking member 6
Is, for example, as shown in FIG. 2, a cylindrical portion having a hollow cylindrical portion 18, a weakened portion 17 and at least two longitudinal grooves.
It consists of 19. The outer diameter of the cylindrical portion 19 is the flexible tube 16
The inner diameter of the flexible tube 16 is smaller than the inner diameter of the inner wall of the flexible tube 16, and the medicinal solution flows through the gap between the outer wall of the cylindrical portion 19 and the inner wall of the flexible tube 16. The chemical liquid in the balloon has flown into the cylindrical portion 18, but the flow of the chemical liquid is closed by the column portion 19 that closes the inner cavity of the cylindrical portion 18 via the weakened portion 17. In order to break the breaking member 6, a fragile portion is manually pressed from the outside of the flexible tube 16.
17 is bent, and the cylindrical portion 19 is separated from the cylindrical portion 18. The column portion 19 stops at the base end 20 of the drug solution flow tube 7 inserted in the inner cavity of the flexible tube 16. Since at least two grooves extending in the longitudinal direction are formed in the outer wall of the columnar portion 19 from the middle, the chemical liquid flows out to the chemical liquid flow tube 7 from these grooves. Although the opening / closing tool 11 is described with the breaking member 6 in FIG. 2, the three-way stopcock 14 shown in FIG. 5 can also be used as the opening / closing tool 11.

Examples of the material of the balloon 1 include elastic rubber and thermoplastic resin. Silicone as elastic rubber
Rubber, butyl rubber, acrylonitrile butadiene rubber, butadiene rubber, isoprene rubber, urethane rubber,
Elastic polymers or natural rubbers such as styrene butadiene rubber, perprene, and Kraton rubber, mixtures of these polymers, or processed substances obtained by removing additives of these substances and then adding harmless antioxidants to the human body, or laminae. −
And the like. Examples of the thermoplastic resin include unstretched, uniaxially stretched or biaxially stretched films of polyethylene, polypropylene, polyvinyl chloride, polyester, polyamide and the like.

In FIG. 1, a chemical liquid flow tube portion b is an opening / closing device 11 installed at the chemical liquid flow outlet 3 of the balloon 1 or the proximal end of the chemical liquid flow tube 7, and a flow rate for controlling the chemical liquid amount. It is composed of a control unit 5, a drug solution distribution tube 7 and a connector 8. The drug solution flowing out from the balloon 1 is discharged from a puncture needle or a catheter connected to the connector 8 via the flow rate controller 5. Injected into the human body. The flow rate control part 5 is a part for controlling the flow rate of the chemical liquid, and has an inner diameter of 10 to 5 as shown in FIG. 3, for example.
If a pipe having a fine inner diameter of 00 μ is installed, the outflow rate of the drug solution in the balloon 1 is slowed down, and the time for injecting the drug solution into the human body can be lengthened. The length of the pipe is more than 1 cm and the outer diameter is 5 to 500 times larger than the inner diameter. Pipe length is 30mm
If it exceeds the above range, it is preferable to use the case 26 accommodating the fine inner diameter pipe 25 having a crimped structure as shown in FIG. 3 because the length of the chemical liquid circulation tube 7 becomes short. As the flow rate control unit 5, a metal pipe, a synthetic resin pipe, a glass pipe, etc. described in Japanese Patent Application Laid-Open No. 2-11160 or Japanese Patent Application Laid-Open No. 3-140163, which the applicant of the present application has already applied, may also be used. You can

The flow rate control unit 5 can be installed at any position of the chemical liquid flow tube 7, but it is preferable in operation to be installed at a position away from the connector 8. The chemical solution downstream side tube d from the flow rate control section 5 to the connecting tool 8 located downstream thereof is
The inner diameter is smaller than the inner diameter of the chemical liquid upstream tube c extending from the flow rate control unit 5 toward the chemical liquid outlet 3 located upstream thereof. The inner diameter of the chemical solution downstream tube d is 15% to 85%, preferably 30%, of the inner diameter of the chemical solution upstream tube c.
~ 70%. The ratio of the inner diameters of the chemical liquid upstream tube c and the chemical liquid downstream tube d also differs depending on the length of the chemical liquid downstream tube d. Between the opening / closing tool 11 and the flow rate control unit 5,
A filter for removing minute substances contained in the chemical liquid in the balloon 1 may be provided. The filter is preferably installed at the tip of the flow rate control unit 5,
A fibrous material, a sintered material or the like is used. Liquid distribution tube 7
Examples thereof include soft polyvinyl chloride, polypropylene, polyester and the like, and the luer taper is provided at the tip thereof.
-Like connection tool 8 is provided, and a venous needle or P is connected through the connection tool 8.
An SV set, a catheter, etc. are connected. The connector 8 may be equipped with a check valve (not shown) for preventing the chemical liquid from flowing back due to venous pressure or the like.

FIG. 3 shows a metering valve on the upstream side of the liquid chemical in the flow control unit 5.
FIG. 3 is an explanatory diagram of the vicinity of a flow rate control unit 5 provided with 10. By providing the metering valve 10 at the chemical solution upstream side inlet of the flow rate control section 5, the quantity of the chemical solution flowing into the flow rate control section 5 can be made substantially constant, so that the flow rate can be controlled more accurately. The metering valve 10 of FIG. 3 is an example, but a plug body 33 is mounted on the upstream side of the chemical liquid and a cap body 36 is mounted on the downstream side of the chemical liquid of a cylindrical body 32 to which an orifice body 30 made of a deformable rubber-like elastic body is fixed. In this structure, the chemical liquid tubes 38, 39 and the chemical liquid passages 40, 41 are arranged in the axial direction in front of and behind the valve hole 31 of the orifice body 30. The orifice body 30 has a valve hole 31 communicating from the chemical solution upstream side to the chemical solution downstream side, the inner diameter of the valve hole 31 becomes the minimum on the way from the valve hole inlet, and gradually goes from the minimum position to the chemical solution downstream side. It has a shape with a large inner diameter. The inner diameter of the valve hole 31 can be arbitrarily changed according to the desired chemical solution outflow rate. The orifice body 30 is fixed to the inner wall of the tubular body 32. A female screw portion 34 is formed on the inner wall of the tubular body 32 on the chemical liquid inflow side, and is screwed with a male screw portion 35 of the stopper body 33 to form a stopper body.
Pressing the orifice body 30 by rotating 33,
The inner diameter of the valve hole 31 is adjusted. A filter 37 for removing minute substances contained in the chemical liquid in the balloon 1 may be provided between the valve hole 31 and the chemical liquid upstream tube c. The filter 37 is preferably installed at the tip of the tube c upstream of the chemical solution.

The stopper 33 is a chemical liquid upstream passage 40 for communicating with the inlet of the valve hole 31 of the orifice body 30, and the chemical liquid upstream passage 40.
A chemical solution upstream tube c connected to 40 is attached,
The tip of the stopper 33 is in contact with the orifice body 30, and the outlet of the chemical solution upstream passage 40 and the inlet of the valve hole 31 of the orifice body 30 are coaxially communicated with each other. A male screw portion 35 that is screwed with the female screw portion 34 of the tubular body 32 is formed on the tip side surface portion of the plug body 33, and by rotating the plug body 33, the male screw portion 35 becomes a female screw portion. The screw portion (34) is moved to adjust the inner diameter of the valve hole (31) of the orifice body (30) to adjust the outflow rate of the drug solution. Cap body
36 is provided with a chemical liquid downstream side passage 41 for communicating with the outlet of the valve hole 31 of the orifice body 30, and a chemical liquid downstream side tube d connected to the chemical liquid downstream side passage 41. One end of the cap body 36 is in contact with the orifice body 30 and is fitted into the inner cavity of the tubular body 32. The inlet of the chemical liquid downstream side passage 41 and the valve hole 31 of the orifice body 30.
Is coaxially communicated with the outlet.

In the metering valve 10 of FIG.
A valve hole 31 is formed in the substantially central portion of the valve body, and by rotating the stopper body 33, the tip of the stopper body 33 presses the annular foot portion of the orifice body 30 made of a rubber-like elastic body, and the inner diameter of the valve hole 31 becomes smaller. A slight change is made to set the chemical solution outflow rate. The valve hole 31 has a shape in which the inner diameter becomes the minimum on the way from the inlet of the valve hole, and the inner diameter gradually increases from the minimum position toward the downstream side of the chemical solution. In this state, the chemical liquid supplied from the chemical liquid upstream tube c through the chemical liquid upstream passage 40 reaches the inlet of the valve hole 31 through the concave space formed at the inlet of the orifice body 31, and is applied to the inlet. The minimum position of the inner diameter of the valve hole 31 slightly changes due to the pressure. As a result, the pressure of the chemical liquid that constantly flows out from the outlet of the valve hole 31 is kept substantially constant.

The orifice body 30 is made of a deformable rubber-like elastic body. Examples of rubber-like elastic materials include styrene / butadiene rubber, isoprene rubber, acrylonitrile / butadiene rubber, butadiene rubber, olefin rubber, fluorine rubber, synthetic rubber such as silicone rubber, urethane rubber, kraton rubber, and perprene, and natural rubber. And so on. The hardness of the elastic body is 25 to 70 degrees, preferably 35 to 60, measured by a JIS-A type spring hardness tester.
It is degree. If the hardness is less than 25 degrees, the orifice body 30 tends to be easily deformed by the pressure of the chemical solution, making it difficult to adjust the inner diameter of the valve hole 31. There is a tendency that the orifice body 30 does not react to the change of the above and the inner diameter of the valve hole 31 does not change. Valve hole 31
The inner diameter of can be arbitrarily changed according to the desired outflow rate of the drug solution, but is usually preferably 100 to 1000 μm.

FIG. 4 is an enlarged cross-sectional view of the balloon part of an embodiment of the drug solution injecting device using the infusion set of the present invention. The housing 2 includes an upper lid portion 55 and a lower lid portion 56, and the lower lid portion 56
The balloon 1 of the infusion set is installed in the container, and the flexible tube 16 is inserted into the insertion hole 57 formed in the side wall of the lower lid portion 56 so that the drug solution distribution tube portion b is located in the lower lid portion 56. It is placed outside. When injecting the drug solution into the human body, the upper lid portion 55 and the lower lid portion 56 are in a closed state by being screwed with a male screw and a female screw provided in each opening. A spring 9 and a pressing member 12 for pressing the balloon 1 are housed in the upper lid portion 55. The base end of the spring 9 is fixed by a locking portion 62 on the inner wall of the upper lid 55, and the other end of the spring 9 is fixed by a locking portion 63 on the inner wall of the pressing member 12. In the method of using the drug solution injector of FIG. 4, a required amount of drug solution is made to flow into the ball 1 from the drug solution inlet 3 of the balloon 1 with an injection needle. Next, attach the ball 1 to the lower lid 56.
Is installed, and the upper lid portion 55 and the lower lid portion 56 are screwed together to close the upper lid portion 55 and the lower lid portion 56, and the spring 9 is filled with the chemical liquid via the pressing member 12. Press 1.
Subsequently, by breaking the breaking member 6, the chemical liquid flows out into the chemical liquid flow tube 7, and the chemical liquid is injected into the human body through the flow rate control unit 5 and the connector 8. Although a coil spring is used as the spring 9 in FIG. 4, a constant force spring having a constant pulling or pushing force can also be used.

FIG. 5 is an enlarged cross-sectional view of the balloon part of another embodiment of the drug solution injector using the infusion set of the present invention. The housing 2 is composed of an upper lid portion 65 and a lower lid portion 66. The infusion set balloon 1 is installed in the lower lid portion 66, and the lower lid portion 66 is provided.
A flexible tube 16 is inserted into an insertion hole 67 formed in a side wall of the flexible tube 16, and a three-way stopcock is provided at an end portion on the opposite side of the flexible tube 16.
14 is installed, and the chemical liquid distribution tube 7 is continuously arranged. The upper lid 65 accommodates a flat air bag 13 whose volume is expanded by filling the inside with compressed air and a pressing member 68 for pressing the balloon 1. The pressing member 68 may be omitted and the balloon 1 may be directly pressed by the airbag 13. The air bag 13 is an air vent hole provided at the tip of an air tube 70 extending from the opening 69.
It is composed of a hollow rubber ball 72 having 71 and a clamp 73 for preventing the air in the air bag 64 from flowing out in the middle of the air tube 70. Also, if necessary,
A pressure gauge and a constant pressure valve may be provided in the middle of the air tube 70. An insertion port 74 for inserting the air tube 70 is formed on the side wall of the upper lid portion 65. In the method of using the drug solution injector of FIG. 5, a required amount of drug solution is made to flow into the ball 1 from the drug solution inlet 3 of the ball 1 with an injection needle. Then the lower lid
The upper lid 65 and the lower lid 66 are closed by installing the balloon 1 in 66 and screwing the upper lid 65 and the lower lid 66 together. Subsequently, compressed air is allowed to flow into the air bag 13 from the rubber ball 72, and the air tube 70 is closed by the clamp 73, so that the valve filled with the chemical solution via the pressing member 68.
Press button 1. Further, by rotating the three-way stopcock 14 installed in the flexible tube 16, the drug solution flows out into the drug solution flow tube 7, and the drug solution is injected into the human body through the flow rate control unit 5 and the connector 8. To be done. Although the flat air bag 13 is used in FIG. 5, it may be a spherical air bag or a cylindrical air bag with one end closed.

[0020]

INDUSTRIAL APPLICABILITY The infusion set of the present invention utilizes the contraction force of the balloon which is filled with the medicinal solution in the balloon and inflates the medicinal solution into the human body while carrying the infusion set on the human body and walking. be able to. Further, a drug solution injecting device using the infusion set of the present invention is a drug solution in a balloon, which is obtained by compressing the balloon from the outside of the balloon filled with the drug solution with a compression mechanism larger than the contraction force of the balloon. Since it is a mechanism for injecting into the patient, the operation mechanism of the balloon in the housing is simplified as compared with the conventional drug solution injecting device, and the drug solution in the balloon is injected into the patient at a constant outflow rate almost to the end. You can Further, by installing a metering valve at the drug solution upstream side inlet of the flow rate control unit, the amount of the drug solution flowing into the flow rate control unit can be made substantially constant, and the drug solution amount can be controlled more accurately and the drug solution can be delivered to the patient. Can be infused at a constant rate for a long time.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of an infusion set of the present invention.

FIG. 2 is a balloon when the balloon of FIG. 1 is filled with a chemical solution.
FIG.

FIG. 3 is an explanatory view of the vicinity of a flow rate control unit in which a metering valve is arranged in a tube on the upstream side of the chemical liquid of the flow rate control unit.

FIG. 4 is an enlarged cross-sectional view of a balloon part of a drug solution injector using the infusion set of the present invention.

FIG. 5 is an enlarged cross-sectional view of the balloon portion of the drug solution injector showing another embodiment of the drug solution injector using the infusion set of the present invention.

FIG. 6 is an overall explanatory view of a drug solution injecting device described in JP-A-4-67873.

FIG. 7 is an enlarged cross-sectional view showing a state when the balloon of the housing shown in FIG. 6 is filled with a chemical liquid.

[Explanation of symbols]

 a Balloon portion b Chemical liquid flow tube portion 1 Balloon 2 Housing 3 Chemical liquid flow outlet 4 Chemical liquid flow inlet 5 Flow control unit 6 Breaking member 7 Chemical liquid flow tube 8 Connector 9 Spring 10 Metering valve 11 Opening / closing device 12, 68 Pressing member 13 Air bag 14 Three-way stopcock

Claims (8)

[Claims] 1. A balloon having a chemical solution inlet for storing the chemical solution under pressure and for allowing the chemical solution to flow in and a chemical solution outlet for letting the chemical solution flow out, and a chemical solution extending from the chemical solution outlet. In an infusion set comprising a distribution tube, an opening / closing tool for circulating or closing the solution in the solution distribution tube, a flow rate control unit for controlling the solution injection rate, and an injection needle or a catheter. An infusion set provided with a connecting tool for doing. 2. The infusion set according to claim 1, wherein the opening / closing tool is a breaking member or a three-way stopcock. 3. The infusion set according to claim 1, wherein the balloon material is made of elastic rubber or thermoplastic resin. 4. The infusion set according to claim 1, wherein a metering valve is provided on the upstream side of the liquid medicine in the flow rate control unit. 5. The infusion set according to claim 4, wherein the metering valve comprises an orifice body made of a rubber-like elastic body having a valve hole whose inner diameter is deformable, and an adjusting means for adjusting the inner diameter of the valve hole. 6. The ball has a flat shape.
The infusion set according to any one of to 5. 7. A housing for accommodating a balloon of an infusion set and a pressurizing mechanism for pressurizing the balloon at a pressure higher than the pressure of the balloon filled with the liquid medicine. The drug solution injector according to any one of 1. 8. The drug solution injector according to claim 7, wherein the pressurizing mechanism uses a spring or a pressurizing gas.