JP4096349B2 - Chemical solution continuous injector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chemical solution continuous injector. More specifically, the present invention relates to a chemical solution continuous injecting device for continuously injecting a chemical solution into blood vessels, epidural, subcutaneous, bladder and the like using the elastic force of rubber.
[0002]
[Prior art]
Conventionally, as a means of injecting a drug solution such as an antibiotic or an anticancer drug into a blood vessel or epidural by a minute amount, a balloon made of a rubber elastic material is filled with the drug solution and the contraction force of the balloon is used for a relatively long time. A chemical solution continuous injector for continuously injecting a chemical solution into a blood vessel or the like has been used (JP-A-4-2360, etc.).
However, in the chemical solution continuous injector that uses the contraction force of the balloon, the balloon forming material is a rubber elastic material. There are drawbacks that the chemical solution cannot be injected, and because the chemical solution is contained in the balloon, it is necessary to select rubber that does not dissolve.
[0003]
In order to solve the above drawbacks, for example, a syringe type chemical solution continuous injector using an elastic material such as a coil spring, a constant load spring, or a rubber wire as a driving means has been proposed (Japanese Patent Laid-Open No. Hei 7- 509).
However, in this type, the plunger is moved forward by the drive means, so there is a risk that the plunger will be inadvertently pressed by touching the hand, etc. It was necessary to prevent the plunger from being pushed. Therefore, there is a disadvantage that the entire apparatus becomes large correspondingly, and it cannot be said that the apparatus is suitable for being carried and used.
Also, those using the elastic force of rubber tend to increase the injection rate rapidly just before the end of the discharge of the chemical solution due to the characteristics of the rubber, while those using the elastic force of the spring increase the weight It has a drawback.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and a chemical solution continuous injector capable of injecting a chemical solution at an accurate speed and amount without changing the pressure at which the chemical solution is injected over time during the injection of the chemical solution. The purpose is to provide. Another object of the present invention is to provide a compact and lightweight chemical continuous infusion device that is free from elution problems.
[0005]
[Means for Solving the Problems]
As a result of intensive studies to solve the above-mentioned problems, the present inventors have solved the sudden increase in the injection rate by extending the rubber elastic body to the stress stable region and using only the rubber stable region. The present invention has been completed. That is, the present invention relates to a bottomed cylindrical capsule having an open base end, a barrel-plunger assembly housed and fixed in the capsule from the distal end side thereof, and a barrel of the barrel-plunger assembly at both ends thereof. The barrel-plunger assembly includes rubber barrels each fixed to the open end of the capsule, and the barrel-plunger assembly includes a barrel having an open base and a plunger having a flange and a gasket at the base and the tip, respectively. A chemical liquid discharge path and a chemical liquid filling path with a check valve are provided through the flange and the gasket in the longitudinal direction, and the plunger is fixed to the capsule via an adapter with the flange, and the rubber elastic force The present invention relates to a continuous drug solution injector capable of moving in a capsule from a first position where the rubber elastic force of the means is not stable to a second position where the rubber elastic force is stable.
Here, in order to facilitate the injection of the chemical liquid into the continuous chemical injector, a through hole is provided in the bottom of the capsule, and the pulling means inserted from this through hole and the tip of the barrel are detachably connected, so that the barrel is You may enable it to move to the front-end | tip direction of a capsule with a pulling means. Moreover, you may provide the scale which shows the residual amount of a chemical | medical solution in a barrel.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing another embodiment. 3 is a view showing a state in which the flow rate control means is connected to the chemical solution continuous injector shown in FIG. 1, and FIG. 4 is a diagram for explaining the use of the chemical solution continuous injector shown in FIG.
As shown in FIGS. 1 and 2, the chemical solution continuous injector of the present invention includes a capsule 1, a barrel-plunger assembly 2 housed and fixed in the capsule 1, and rubber elastic force means 3. The barrel-plunger assembly 2 includes a barrel 21 and a plunger 22 having a flange 221 and a gasket 222 at its proximal end and distal end, respectively, and in the longitudinal direction thereof, is filled with a chemical solution through the flange 221 and the gasket 222. A path 23 and a chemical liquid discharge path 24 are provided. The plunger 22 is fixed to the capsule 1 by the flange 221 via the adapter 4, and is moved from the first position where the rubber elastic force of the rubber elastic force means 3 is not stable to the second position where the rubber elastic force is stable. Is movable.
[0007]
The capsule 1 is a cylindrical member whose base end is open, and has a bottom 11, and an annular protrusion 12 is provided on the inner wall of the base end. An adapter 4 is attached to the annular protrusion 12, and one end 31 (formed in a flange shape) of the rubber elastic force means 3 is sandwiched and fixed between the adapter 4 and the annular protrusion 12. The annular protrusion 12 is provided to provide a gap between the inner wall of the capsule 1 and the rubber elastic force means 3 and the barrel 21, whereby the rubber elastic force means 3 can be expanded and contracted and the barrel 21 can be moved within the capsule 1. It has become.
[0008]
The barrel-plunger assembly 2 includes a barrel 21 having an open base end, and a plunger 22 having a flange 221 at the base end and a gasket 222 at the front end. The barrel-plunger assembly 2 is provided with a chemical liquid filling path 23 with a check valve 232 and a chemical liquid discharge path 24 through the flange 221 and the gasket 222 in the longitudinal axis direction. The chemical solution outlet 241 is provided in the flange 221. The check valve 231 of the chemical liquid filling path 23 is preferably provided close to the chemical liquid storage chamber of the barrel 21 (a space formed between the tip of the barrel 21 and the gasket 222), and is provided integrally with the gasket 222 in the figure. Yes. When the chemical solution continuous injector of the present invention is used, the tube 61 of the flow rate control means 6 is connected to the chemical solution outlet 241 as shown in FIG. The barrel 21 may be provided with a scale 212 for indicating the remaining amount of the chemical solution.
[0009]
The barrel-plunger assembly 2 is fixed to the adapter 4 attached to the proximal end of the capsule 1 at the flange 221 portion of the plunger 21. The adapter 4 is a short cylindrical member that is attached to the annular projection 12 at the proximal end of the capsule 1, and has an attachment portion 44 having a U-shaped cross section on the outer wall of the proximal end. Two annular ribs 41 and 42 for determining the position and a stop projection 43 for preventing the flange 221 from moving in the direction of the bottom 11 of the capsule 1 are provided. With this configuration, the barrel-plunger assembly 2 is moved from the first position where the rubber elastic force of the rubber elastic force means 3 is not stable (the position where the rubber elastic force is engaged with the annular rib 41) to the second position where the rubber elastic force is stable ( The inside of the capsule 1 can be moved to a position engaging with the annular rib 42.
[0010]
The rubber elastic force means 3 is means for pulling back the barrel 21 in the direction of the adapter 4 using a rubber elastic biasing force. One end 31 (flange-shaped portion) of the rubber elastic force means 3 is between the adapter 4 and the annular protrusion 12 as described above. The other end is fixed to the outer wall of the base end portion of the barrel 21. The length of the rubber elastic force means 3 in the longitudinal axis direction is such that when the barrel-plunger assembly 2 is in the first position, the base end of the barrel 21 and the tip of the adapter 4 without the rubber elastic force means 3 extending. Are determined to collide. Various shapes such as a tube shape, a line shape, and a plate shape can be adopted as the shape of the rubber elastic force means 3, but a tube shape or a line shape is generally used. As a material for forming the rubber elastic force means 3, natural rubber or various synthetic rubbers such as isoprene rubber, butadiene rubber, styrene-butadiene rubber and the like are employed.
[0011]
As shown in FIG. 2, the chemical solution continuous infuser may have a configuration in which traction means 5 that can be detachably connected to the tip of the barrel 21 is provided. The pulling means 5 has an engaging means 51 at the distal end and a flange 52 for placing a finger on the proximal end. The shape of the traction means 5 is not limited to the shape shown in FIG. 2, but the shape of the traction means 5 is any shape as long as it can be engaged with the barrel 21 and pulled and moved. May be. In FIG. 2, an engagement means 211 (having a shape complementary to the engagement means 51) that engages with the engagement means 51 at the distal end of the traction means 5 is provided at the distal end of the barrel 21. Is provided with a through-hole 12 for inserting the traction means 5.
[0012]
Next, the use of the chemical solution continuous injector of the present invention will be described with reference to FIG.
The chemical solution continuous injector of the present invention is initially in a state as shown in (A), and the barrel-plunger assembly 2 is in the first position. First, the portion of the flange 221 is pushed to move the barrel-plunger assembly 2 to the second position (FIG. 4-B). Next, a tip of a syringe (not shown) is connected to the chemical solution filling port 231 to inject the chemical solution. Then, the barrel 21 is pushed by the injected chemical and moves along the inner wall of the capsule 1 to reach a position close to the bottom 11 of the capsule 1 (FIG. 4-A).
Finally, the flow rate control means 6 may be connected to the chemical solution outlet 241.
[0013]
【The invention's effect】
As is apparent from the above description, if the chemical solution continuous injector of the present invention is used, only the stable portion of the elastic force of the rubber elastic force means can be used, so that the chemical solution can be injected at an accurate speed and amount. . In addition, there can be provided a compact and lightweight chemical continuous infusion device that is free from elution problems.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing another embodiment of the present invention.
FIG. 3 is a view showing a state in which a flow rate control unit is connected to the chemical solution continuous injector shown in FIG. 1;
FIG. 4 is a diagram for explaining the use of the chemical liquid continuous injector shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Capsule 11 Bottom 12 Through-hole 2 Barrel-plunger assembly 21 Barrel 211 Engaging means 212 Scale 22 Plunger 221 Flange 222 Gasket 23 Chemical liquid filling path 231 Chemical liquid filling port 232 Check valve 24 Chemical liquid discharge path 241 Chemical liquid discharge port 3 Rubber elasticity Force means 31 One end (flange-shaped part)
4 Adapters 41, 42 Annular rib 43 Stop projection 44 Mounting portion 5 Pulling means 51 Engaging means 52 Flange 6 Flow rate control means 61 Tube

Claims (3)

A bottomed cylindrical capsule having an open base end, a barrel-plunger assembly housed and fixed in the capsule from the distal end side, and both ends of the capsule at the barrel-plunger assembly barrel and the open end of the capsule, respectively. The barrel-plunger assembly includes a barrel having a proximal end opened, and a plunger having a flange and a gasket at the proximal end and the distal end, respectively, and the flange-plunger assembly includes a flange and a gasket. And a chemical solution discharge passage and a check solution filling passage with a check valve are provided through the gasket,
The plunger is secured to the adapter attached to the proximal end of the capsule with the flange;
One end of the rubber elastic force means is sandwiched between the adapter and an annular protrusion provided at the tip of the capsule, and the other end is fixed to the outer wall of the base end of the barrel,
The barrel stabilizes the rubber elastic force from the first position where the rubber elastic force of the rubber elastic force means is not stable so that the gasket is disposed inside without exceeding the open end. Movable within the capsule to a second position;
Chemical liquid is filled, said barrel the barrel was surrounded by the said gasket barrel by moving the bottom direction of the capsule - filled through the chemical filling passage the inner space of the plunger assembly, said barrel Is a chemical liquid continuous injector that is discharged through the chemical liquid discharge path by moving toward the tip of the capsule .   2. The continuous medicinal solution injector according to claim 1, wherein a through hole is provided in the bottom of the capsule, and the traction means inserted from the through hole is detachably connected to the tip of the barrel.   The chemical solution continuous injector according to claim 1 or 2, wherein a scale indicating the remaining amount of the chemical solution is provided on the barrel.

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