JPH10179735A - Liquid medicine injection instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid medicine injection instrument capable of flow rate adjustment for reducing the residual amount of liquid medicine as much as possible. SOLUTION: This liquid medicine injection instrument is composed of a balloon 1 composed of an elastic material capable of flowing out the housed liquid medicine in a pressurized state, a liquid medicine flow-in part 3 for flowing in the liquid medicine into the balloon 1 and a liquid medicine flow-out part 4 for flowing out the liquid medicine from the balloon. The liquid medicine flow-out part 4 is composed of a liquid medicine flow-out tube 9 and a liquid medicine flow rate adjustment part 41, the liquid medicine flow rate adjustment part 41 is provided with plural constant flow rate passages controlled to a prescribed flow rate beforehand and the flow-out side end face of the constant flow rate passage is composed of a circular passage switching member fitting part and a disk-like passage switching member provided with at least one liquid medicine passing port liquid-tightly fitted to the passage switching member fitting part slidably and rotatably. By sliding and rotating the passage switching member and matching the liquid medicine passing port with the flow-out port of the desired constant flow rate passage, the flow rate of the liquid medicine is switched.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drug-injection device with a balloon capable of continuously injecting a predetermined amount of a drug solution into a blood vessel, epidural, subcutaneous, bladder, or the like for a long period of time. The present invention relates to a liquid injector with a balloon.

[0002]

2. Description of the Related Art Conventionally, as a means for injecting a small amount of a drug solution such as an antibiotic, an anticancer drug, or an anesthetic agent into a blood vessel, epidural, or the like, a drug solution flows into a balloon made of an elastic material, and the contraction force of the balloon is reduced. 2. Description of the Related Art A drug solution infusion device with a balloon for continuously injecting a drug solution into a blood vessel or the like for a relatively long period of time has been used. Japanese Patent Application Laid-Open No. 5-84310 proposes a variable micro flow control device capable of switching the flow rate of a drug solution flowing out of a balloon portion, which device includes a flow control tube connected to a multi-way cock. This variable minute flow rate control device has one end connected to a balloon portion via a tube, and the other end injected into a human body via a tube and a catheter.

[0003]

However, in the drug solution injector with a balloon, when the balloon does not have the contracting force, the force for injecting the drug solution into the human body is lost, and the drug solution remains in the balloon and the connection circuit. Therefore, as described above, when the variable minute flow rate control device is connected to the balloon portion, the connection circuit becomes longer, and as a result, more and more chemical solution remains. An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a drug solution injector capable of adjusting a flow rate to minimize the remaining amount of a drug solution.

[0004]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the conventional drawbacks, and as a result, have provided a plurality of constant flow paths and a chemical liquid flow control section in the chemical liquid outflow section of the balloon section. To solve the above problems,
The present invention has been reached. That is, the present invention provides a balloon made of an elastic material capable of flowing out a contained chemical solution in a pressurized state, a chemical solution inflow portion for flowing a chemical solution into the balloon, and a chemical solution outflow portion for causing a medical solution to flow out of the balloon. A drug solution injecting device, wherein the drug solution outflow portion comprises a drug solution outflow tube and a drug solution flow rate adjustment portion, the drug solution flow rate adjustment portion has a plurality of constant flow paths which are controlled in advance to a predetermined flow rate,
The outflow side end face of the constant flow passage has a circular passage switching member fitting portion, and a circle having at least one chemical liquid passage port slidably and rotatably fitted to the passage switching member fitting portion. A chemical liquid injection device comprising a plate-shaped passage switching member, sliding the passage switching member, and switching the chemical liquid flow rate by matching the chemical liquid passage with an outlet of a desired constant flow passage. is there. Here, the passage switching member fitting portion is preferably formed of a convex portion having a notch in a part formed along the circular edge. Also, the passage switching member fitting portion preferably has a convex portion at the center of the circle.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing one embodiment of the drug solution injection device of the present invention, FIG. 2 is a longitudinal sectional view of the drug solution injection device shown in FIG. 1, and FIG. 3 is a perspective view of a main part of the drug solution injection device shown in FIG. FIG. 4 is an explanatory view of a chemical outflow portion of the chemical injection device shown in FIG. 1, and FIG. 5 is an explanatory view of a passage switching operation of the chemical injection device shown in FIG. 6 is a front view showing another embodiment of the drug solution injection device of the present invention, FIG. 7 is a longitudinal sectional view of the drug solution injection device shown in FIG. 6, and FIG. 8 is a perspective view of a main part of the drug solution injection device shown in FIG. FIG. 9 is an explanatory view of a chemical outflow portion of the liquid injector shown in FIG. 6, and FIG. 10 is an explanatory view of a passage switching operation of the liquid injector shown in FIG.

FIGS. 1 and 2 are drawings of a drug solution injection device showing an example of the present invention. A balloon 1 made of an elastic material is covered over substantially the entirety of a cylindrical fixed shaft 2, and the balloon 1 is fixed. The outer periphery of both ends of the shaft 2 is tightly fixed by a fixing ring 51. And fixed shaft 2
Is provided at one end with a chemical solution inflow portion 3, and at the other end of the fixed shaft 2 is provided with a chemical solution outflow portion 4.

[0007] The fixed shaft 2 is provided with a lumen 21 as a passage for a chemical solution in the longitudinal direction thereof, and the lumen 21 communicates with the chemical solution inflow portion 3 and the chemical solution outflow portion 4. The fixed shaft 2 is provided with at least one communication hole 22 so that the lumen 21 and the balloon 1 communicate with each other. After the drug solution flowing from the drug solution inflow portion 3 fills the lumen 21 and the communication hole 22,
The balloon 1 is inflated. It is preferable that a plurality of communication holes 22 are provided so that the entire balloon 1 is evenly inflated. In addition, it is preferable that the lumen 21 is not made larger than necessary in consideration of the remaining amount of the drug solution after the drug solution is injected into the human body. Examples of the material of the fixed shaft 2 employed here include polycarbonate, polypropylene, and polyethylene. Although the fixed shaft 2 is provided inside the balloon 1 in this embodiment, the inside of the balloon 1 is not limited to such an embodiment in the present invention, and Japanese Patent Publication No. 3-55142 and Japanese Patent Publication No. 1-501451 are disclosed. And those described in JP-A-2-11160 and JP-A-3-170163 can also be used. The balloon 1 is in close contact with the fixed shaft 2 in a deflated state in which the drug solution has not flowed, has a cylindrical shape (not shown), and expands when the drug solution flows. As the material of the balloon 1, synthetic rubber, natural rubber, thermoplastic resin and the like are preferably employed. The chemical inflow section 3 is provided with an inflow port 31 through which a medical fluid can flow through a syringe or the like, and a check valve 32 that allows the inflow of the chemical from the inflow port 31 to the lumen 21 but does not allow the outflow of the chemical in the opposite direction. ing.

[0008] The chemical outflow section 4 includes a chemical outflow tube 9 and
And a chemical liquid flow rate adjusting unit 41. As shown in FIG. 4 (a), the chemical liquid flow rate adjusting unit 41 has three constant flow paths 61, 62, 63 controlled in advance to a predetermined flow rate.
The outflow-side end surfaces of the three constant flow passages 61, 62, and 63 have a circular passage switching member fitting portion 81 in which the edge convex portion 811 is partially cut out (about 90 degrees), as shown in FIG. And a disc-shaped passage switching member 71 having a passage switching member operating section 711 as shown. Passage switching member 71
Are arranged such that the passage switching member operation section 711 projects from the cutout portion of the passage switching member fitting section 81. The disc of the passage switching member 71 is fitted in a recess of the passage switching member fitting portion 81 in a liquid-tight manner, and the outflow port 43 is fixed to the edge convex portion 811 of the passage switching member fitting portion 81 to adjust the chemical liquid flow rate. A part 41 is formed. One end of the drug solution outflow tube 9 is attached to the outflow port 43, and a catheter, an injection needle, and the like are connected to the other end of the drug solution outflow tube 9, and the drug solution is injected into a human body. In the present embodiment, the constant flow passages 61, 62, 63 are arranged in a cylinder formed integrally with the fixed shaft 2, but this cylinder may be fixed after being formed separately. Also, the passage switching member 7
Although there is no particular limitation on the material of 1, polycarbonate,
Polypropylene, polyethylene and the like are employed. Here, it is preferable that an O-ring 52 for preventing liquid leakage is provided at a contact portion between the outlets of the constant flow passages 61, 62, 63 and the passage switching member 71. Similarly, it is preferable that an O-ring (not shown) be provided at the contact portion between the passage switching member 71 and the outflow port 43.

The three constant flow passages 61, 62, 63 are controlled at different flow rates. Further, as shown in FIG. 4 (b), the passage switching member 71 has one chemical passage 712. The passage switching member 71 is slid and rotated, and the chemical passage 712 is moved to the desired flow rate at a constant flow rate. By matching with the outlet of the passage, the chemical solution flows out of the matched constant flow passage, and the unmatched constant flow passage is shut off. 5A shows a state in which the chemical solution flows out from the constant flow passage 61, and FIG.
2 shows a state in which a chemical solution flows out, and FIG.
This shows a state in which a chemical solution flows out of the apparatus. In this embodiment, since three constant flow passages are provided, the passage switching member 71 is rotated to switch the chemical liquid flow in three stages.

In the present invention, the number of constant flow passages is not limited to three, but the number can be increased or decreased as necessary. The balloon 1 may be stored in a housing (not shown). This is to prevent the balloon from touching and damaging an external sharp object, and to prevent the chemical solution from splashing out if the balloon leaks due to a defect such as a pinhole in the balloon itself. is there. The housing is preferably made of a transparent material so that the injection state of the drug solution can be visually observed from the outside. Further, a hydrophobic air filter or the like is provided on the housing so as not to affect the expansion and contraction of the balloon. Is preferably provided.

The embodiment shown in FIGS. 6 to 10 corresponds to FIGS.
This is a drug solution injection device having a drug solution flow rate adjusting section 42 different from the embodiment shown in FIG. The chemical liquid flow rate adjusting section 42 includes three constant flow paths 64 controlled in advance to a predetermined flow rate shown in FIG.
65, 66, these three constant flow passages 64, 65,
A passage switching member provided with an outflow-side end surface of 66 provided with outlets of three constant flow passages 64, 65, and 66 provided at intervals of 120 degrees and a central convex portion 821 protruding at the center of the circular end surface. It is composed of a fitting portion 82 and a disc-shaped passage switching member 72 having a fitting hole 721 at the center shown in FIG. 9B. The chemical liquid flow rate adjusting section 42 includes a fitting hole 721.
The passage switching member 72 is formed by being fitted in the passage switching member fitting portion 82 in a liquid-tight manner. Then, the outflow port 43 is fixed to the central convex portion 821 of the passage switching member fitting portion 82. In this embodiment,
The constant flow passages 64, 65, and 66 are arranged in a cylinder formed integrally with the fixed shaft 2, but this cylinder may be fixed after being formed separately.

The three constant flow passages 64, 65, 66 are controlled at different flow rates. Further, the passage switching member 72 has six chemical solution passage ports 722, and FIG.
As shown in FIG. 0, the passage switching member 72 is slid and rotated so that the chemical liquid passage 722 coincides with the outlet of the constant flow passage having the desired flow rate. The constant flow passage which is not set is shut off. 10A shows a state in which the chemical solution flows out from the constant flow passage 64, FIG. 10B shows a state in which the chemical solution flows out from the constant flow passages 64 and 66, and FIG. (D) is a state in which the drug solution flows out of the constant flow paths 64, 65, (e) is a state in which the drug solution flows out of the constant flow paths 64, 65, 66,
(F) is a state in which the chemical solution flows out from the constant flow passage 66,
(G) shows a state in which the chemical solution flows out from the constant flow passages 65 and 66. In this embodiment, since three constant flow passages are provided, the passage switching member 72 is rotated to switch the chemical liquid flow in seven stages. Note that each of the constant flow passages may be controlled to the same flow rate. However, when it is desired to increase the number of switching flow rates, it is preferable to control the flow rates to different flow rates. Further, the arrangement position of the constant flow passages, the number of the constant flow passages, and the number of the chemical solution passage ports are not limited to the above shapes.

[0013]

As is apparent from the above description, in the chemical liquid injector according to the present invention, since the chemical liquid flow rate adjusting part is incorporated in the chemical liquid outlet of the balloon part, it is connected to the balloon part through a tube. As compared with the variable minute flow rate control device to be used, the amount of the chemical remaining in the connection circuit can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a drug solution injector according to the present invention.

FIG. 2 is a longitudinal sectional view of the drug solution injector shown in FIG.

3 is a perspective view of a main part of the drug solution injector shown in FIG. 1. FIG.

FIG. 4 is an explanatory view of a chemical liquid flow rate adjusting section of the chemical liquid injector shown in FIG. 1;

FIG. 5 is an explanatory view of a passage switching operation of the drug solution injector shown in FIG. 1;

FIG. 6 is a front view showing another embodiment of the drug solution injector of the present invention.

FIG. 7 is a longitudinal sectional view of the drug solution injector shown in FIG.

FIG. 8 is a perspective view of a main part of the drug solution injector shown in FIG. 6;

FIG. 9 is an explanatory view of a chemical liquid flow rate adjusting section of the chemical liquid injector shown in FIG. 6;

FIG. 10 is an explanatory view of a passage switching operation of the drug solution injector shown in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Balloon 2 Fixed shaft 21 Lumen 22 Communication hole 3 Chemical liquid inflow part 31 Inflow port 32 Check valve 4 Chemical liquid outflow part 41, 42 Chemical liquid flow rate adjustment part 43 Outflow port 51 Fixed ring 52 O-ring 61, 62, 63, 64, 65, 66 Constant flow passage 71, 72 Passage switching member 711 Passage switching member operation section 712, 722 Chemical passage port 721 Fitting hole 81, 82 Passage switching member fitting portion 811 Edge convex portion 821 Center convex portion 9 Chemical liquid outflow tube

Claims (3)

[Claims] 1. A balloon made of an elastic material capable of flowing out a stored chemical solution under a pressurized state, a chemical solution inflow portion for flowing a chemical solution into the balloon, and a chemical solution outflow portion for flowing a medical solution out of the balloon. A liquid injector comprising:
The drug solution outflow section includes a drug solution outflow tube and a drug solution flow rate control section. The drug solution flow rate control section has a plurality of constant flow paths which are controlled in advance to a predetermined flow rate, and the outflow side end face of the constant flow rate path is circular. A passage switching member fitting portion, and a disc-shaped passage switching member having at least one chemical solution passage port which is slidably and rotatively fitted to the passage switching member fitting portion, A chemical solution injection device in which a flow rate of a chemical solution can be switched by slidingly rotating the passage switching member to match the chemical solution passage opening with an outlet of a desired constant flow passage. 2. The liquid medicine injection device according to claim 1, wherein the passage switching member fitting portion comprises a convex portion formed along a circular edge and having a notch in a part. 3. The liquid injector according to claim 1, wherein the passage switching member fitting portion has a convex portion at the center of the circle.