JP3762873B2 - Chemical solution injector suitable for small doses - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chemical solution injector suitable for administering a small amount of a chemical solution by a continuous operation from a priming operation. The medicinal solution infusion of the present invention is suitable for administration of another chemical solution during the administration of the chemical solution or for administration of a drug that may contaminate the operator during a mixed injection operation such as an anticancer agent.
[0002]
[Prior art]
When administering a chemical solution using an infusion set or a catheter, it is often necessary to administer another chemical solution during the administration of the chemical solution. For example, it is a case of a contrast agent, a hormone preparation, a peptide preparation, an anticancer agent, a vitamin preparation and the like, and is often performed using a so-called prefilled syringe filled with a chemical solution in advance.
Conventionally, when such mixed injection is required, it has been performed by switching the flow path using a three-way stopcock or a Y-shaped tube.
[0003]
However, in the case of mixed injection using such a three-way stopcock or a Y-shaped tube, there is a risk that the chemical solution contained in the prefilled syringe may be leaked to the outside during the connection operation or priming of the prefilled syringe. When a high dosage is mixed, there is a health problem for the operator. In addition, when a small amount of an expensive drug solution is administered, the operation is complicated, and there is a problem that the concentration becomes dilute due to mixing with other drug solutions and effective administration cannot be performed or there is a residual solution.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a chemical solution injector that is simple in operation and can continuously administer a small amount of another chemical solution during the administration of the chemical solution. .
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present inventor has conceived that the above problems can be solved by adopting a prefilled syringe that can change the dosing mode by a single operation of continuously pressing the pusher as a result of intensive studies. Completed the invention. That is, the present invention provides a cylindrical body whose both ends are open, and a first gasket on the distal end side which is inserted into a lumen of the cylindrical body at a predetermined distance so as to be liquid-tight and slidable along the inner wall. And a second gasket on the proximal end side, and the cylindrical body is provided with an inlet and an outlet for the chemical solution on the opposite side wall with respect to the longitudinal axis, and between the first gasket and the second gasket. Is a chemical solution chamber filled with a chemical solution, and the first gasket has a seal portion at both ends and a chemical solution passage in the central portion, and the chemical solution passage communicates an inlet and an outlet of the chemical solution. 1 is movable from the position 1 to the distal end of the cylindrical body, the chemical liquid inlet is open to the inner cavity of the cylindrical body on the distal end side from the outlet, and the chemical liquid chamber communicates with the chemical liquid outlet. The first gasket stops at the second position where it does not communicate with the inlet. Relates to chemical injector stop means thus provided for the leading end portion of the tubular body.
[0006]
Here, the second gasket has a seal part at both ends and a chemical solution passage in the central part so that the chemical solution from the inlet of the chemical solution can be administered after the chemical solution is administered in the chemical solution chamber. There may be. However, at this time, when the first gasket moves to the tip of the cylindrical body in contact with the second gasket, the chemical solution inlet and the outlet need to communicate with each other through the chemical solution passage of the second gasket. is there. Further, the chemical liquid passage may be an annular groove formed between the seal portions or a through hole that crosses the gasket. You may provide the pusher which moves a 2nd gasket to a front-end | tip direction at the base end of a cylindrical body. As the stopping means, for example, a plurality of vertical ribs provided on the inner wall of the cylindrical body and extending in the distal direction from a position where it abuts with the distal end of the first gasket is employed.
[0007]
The chemical solution injector of the present invention is connected to a syringe and is used for vascular injection of a contrast agent for myocardial scintigraphy, mixed injection of a hormone preparation into a dialysis circuit for treatment of renal anemia, and treatment of osteoporosis. For example, when a vitamin preparation is injected just before the start of a high-calorie infusion to prevent Maillard reaction by connecting to an infusion bag or bottle via a tube, etc. Can be used for
[0008]
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 FIGS. 2 to 5 are views for explaining a use state of the chemical liquid injector of the present invention.
As shown in FIG. 1, the chemical injector of the present invention includes a cylindrical body 1 and two gaskets 2 and 3 inserted into the cylindrical body 1. The cylindrical body 1 is provided with an inlet 13 and an outlet 14 for a chemical solution on the opposite side wall with respect to the longitudinal axis, and a chemical chamber 4 is formed between the two gaskets 2 and 3. The first gasket 2 is provided with a chemical passage 22 at a central portion, and is movable from the first position where the chemical passage 22 communicates with the chemical inlet 13 and the outlet 14 to the tip 11. The chemical liquid inlet 13 is open to the inner cavity of the cylindrical body 1 on the distal end side from the outlet 14, and the first gasket 2 is configured so that the chemical liquid chamber 4 communicates with the chemical liquid outlet 14 and does not communicate with the inlet 13. It stops at the position.
[0009]
Both ends 11 and 12 of the cylindrical body 1 are open, and a chemical solution inlet 13 and an outlet 14 are provided on the opposite side wall with respect to the longitudinal axis, and the chemical solution inlet 13 is cylindrical on the tip 11 side of the outlet 14. Opening into the lumen of the body 1. Two gaskets 2 and 3 are inserted into the inner cavity of the cylindrical body 1 at a predetermined distance so as to be liquid-tight and slidable along the inner wall, and a chemical solution chamber 4 is provided between the two gaskets 2 and 3. It has become. The chemical chamber 4 is filled with a chemical solution (omitted).
[0010]
The first gasket 2 on the distal end 11 side has seal portions 21 at both ends, and a chemical liquid passage 22 is provided in the center portion. The chemical liquid passage 22 may be an annular groove 22 formed between the seal portions 21 or a through hole (not shown) that crosses the gasket. The first gasket 2 is slidable from the first position where the chemical solution inlet 13 and the outlet 14 of the cylindrical body 1 communicate with each other through the chemical passage 22 to the tip 11 of the cylindrical body 1. An annular protrusion 16 is provided at the distal end 11 of the body 1 so that the first gasket 2 does not move beyond the distal end 11. When the first gasket 2 is moved in the direction of the tip 11, the chemical solution chamber 4 stops at a second position where the chemical solution outlet 14 communicates with the chemical inlet 14 and does not communicate with the inlet 13. Stop means is provided at the tip. As the stopping means, for example, as shown in FIG. 1, a plurality of vertical ribs 15 provided on the inner wall of the cylindrical body 1 and extending in the distal direction from a position where it abuts with the distal end of the first gasket 2, Although not shown, an abutting member (for example, a cap-like member similar to the pusher 5 described later, which is detachably inserted into the lumen from the direction of the distal end 11, but the outer diameter of the insertion portion is that of the annular protrusion 16. It is necessary to make it smaller than the inner diameter).
[0011]
The second gasket 3 on the base end 12 side may be a normal one without a chemical solution passage, but after administration of the chemical solution in the chemical solution chamber 4, the chemical solution from the chemical solution inlet 13 can be administered. It may have a seal portion 31 at both ends and a chemical passage 32 provided in the central portion. However, at this time, when the first gasket 2 moves to the tip 11 of the cylindrical body 1 in contact with the second gasket 3, the chemical inlet 13 through the chemical passage 32 of the second gasket 3. And the outlet 14 need to communicate with each other.
A pusher 5 for moving the second gasket 3 in the direction of the distal end 11 may be provided at the base end of the cylindrical body 1. The pusher 5 is not particularly limited. For example, a cap-like one that engages with the outer wall of the cylindrical body 1 and can be easily moved in the direction of the tip 11 as shown in FIG. 1 is preferable. Adopted. In the figure, 51 is an engaging portion, 52 is a pressing portion, and the pusher 5 is formed from the position where the annular groove 17 of the tubular body 1 and the annular rib 511 of the engaging portion 51 are engaged. It can move to a position where the stepped portion 18 and the annular rib 511 are engaged.
[0012]
Next, the use of the chemical injector of the present invention will be described with reference to the drawings.
2 to 5 are usage examples when a contrast medium is injected into a blood vessel.
First, a chemical solution injector I filled with a contrast medium (not shown) is prepared in the chemical solution chamber 4, and a winged needle (not shown) is connected to the chemical solution outlet 14, for example. At this time, the first gasket 2 is in the first position where the chemical passage 22 communicates with the chemical solution inlet 13 and the outlet 14. Next, as shown in FIG. 2, the tip 6 of the syringe S filled with physiological saline (not shown, hereinafter referred to as raw food) is inserted into the chemical solution inlet 13 of the chemical solution injector I, and the plunger 7 When is pressed, the raw food of the syringe S flows through the chemical solution inlet 13, the chemical solution passage 22, the outlet 14, and the winged needle, and the contrast agent flow path is washed (referred to as priming).
[0013]
When the priming is completed, the winged needle is inserted into the patient's blood vessel to secure the blood vessel. Next, when the pusher 5 of the chemical solution injector I is pushed, the second gasket 3, the chemical solution chamber 4 and the first gasket 2 move in the distal direction, and the chemical solution chamber 4 communicates with the chemical solution outlet 14 and the inlet 13. Stops at the second position that does not communicate with. When the pusher 5 is continuously pushed, the contrast medium in the drug solution chamber 4 is injected into the blood vessel from the drug solution outlet 14 via the winged needle (see FIG. 3). When the contrast medium in the medicine chamber 4 becomes empty, as shown in FIG. 4, the two gaskets 2 and 3 come into contact with each other, and the first gasket 2 moves integrally to a position where the advancement is prevented by the annular protrusion 16. To do. At this time, the chemical solution inlet 13 and the outlet 14 communicate with each other through the chemical solution passage 32 of the second gasket 3. Next, when the plunger 7 of the syringe S is pushed, the raw food flows through the chemical solution inlet 13, the chemical solution passage 22, the outlet 14, and the wing needle, and the contrast agent remaining in the chemical solution outlet 14 and the wing needle is a blood vessel. (See FIG. 5).
[0014]
【The invention's effect】
As is apparent from the above description, according to the present invention, the following effects can be expected.
Since the medication mode can be changed with a simple operation of simply pressing the pusher, the operation is simple. In addition, another chemical solution can be administered continuously during the course of administration, which is convenient when administering a small amount of an expensive chemical solution. In this case, the concentration is dilute because it is not administered as a mixture with other chemical solutions. Can be effectively administered. By administering an inexpensive chemical solution again after the administration of the expensive chemical solution, the residual liquid of the expensive chemical solution can be poured, so that the expensive chemical solution is not wasted.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
FIG. 2 is a view for explaining a use state of the chemical injector of the present invention.
FIG. 3 is a view for explaining a use state of the chemical liquid injector of the present invention.
FIG. 4 is a diagram for explaining a use state of the chemical injector of the present invention.
FIG. 5 is a view for explaining a use state of the chemical liquid injector of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylindrical body 11 Tip 12 Base end 13 Chemical solution inlet 14 Chemical solution outlet 15 Longitudinal rib 16 Annular projection 17 Annular groove 18 Step part 2 First gasket 21 Seal part 22 Chemical liquid passage 3 Second gasket 31 Seal part 32 Chemical liquid Passage 4 Chemical solution chamber 5 Pusher 51 Engaging portion 511 Annular rib 52 Pressing portion 6 Tip 7 Plunger S Syringe I Chemical solution injector

Claims (5)

A cylindrical body with both ends open, and a first gasket on the distal end side and a proximal end side inserted into the inner cavity of the cylindrical body at a predetermined distance so as to be liquid-tight and slidable along the inner wall The cylindrical body is provided with an inlet and an outlet for the chemical solution on the opposite side wall with respect to the longitudinal axis, and the chemical solution is filled between the first gasket and the second gasket. The first gasket has a seal portion at both ends, a chemical passage is provided in the central portion, and the chemical passage is connected to the chemical solution inlet and outlet from a first position. The medical solution inlet is movable to the distal end of the cylindrical body, the chemical solution inlet is open to the inner cavity of the cylindrical body on the distal end side from the outlet, and the chemical solution chamber communicates with the chemical solution outlet. Of the tubular body so that the first gasket stops at the second position that does not. Will be the stop means provided at the ends, and, second gasket is made by chemical passage is provided between the seal portion and having a sealing portion at both ends, first in contact with the second gasket A chemical solution injector in which an inlet and an outlet of a chemical solution communicate with each other when the gasket of 1 moves to the tip of a cylindrical body .   The chemical solution injector according to claim 1, wherein the chemical solution passage is an annular groove formed between the seal portions.   The chemical solution injector according to claim 1, wherein the chemical solution passage is a through hole that crosses a gasket formed between the seal portions. The drug solution injector according to any one of claims 1 to 3 , wherein a pusher for moving the second gasket in the distal direction is provided at a proximal end of the cylindrical body. The chemical solution injector according to any one of claims 1 to 4 , wherein the stopping means is a plurality of vertical ribs provided on an inner wall of the cylindrical body and extending in a distal direction from a position where the stopper is in contact with the distal end of the first gasket. .

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