JP2002325845A - Drug solution injector suitable for small volume of drug solution dosing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drug solution injector which is easily operable and can dose a small volume of other drug solution midway drug solution dosing. SOLUTION: The inlet 13 and the outlet 14 are equipped on both sides mutually opposite with respect to the longitudinal axis on the cylindrical body 1. Gaskets 2, 3 are tightly in contact with each other and a drug solution chamber 5 is equipped in between gaskets 3, 4. On the base end of the gasket 2, both ends of the gasket 3, and the tip end of the gasket 4, cylindrical projections 21, 31, 32, 41 with outer diameters smaller than the inner diameter of the cylindrical body 1 are equipped. The gasket 2 is movable from a position to communicate the inlet 13 with the outlet 14 for drug solution to the tip end 11 of the cylindrical body 1 via the cylindrical projection parts 21, 31. The inlet 13 for drug solution is opened to the lumen of the cylindrical body 1 to the tip end side than the outlet 14 so that the inlet 13 and the outlet 14 for drug solution communicate with each other via the cylindrical projection parts 32, 41 when the gasket 2 is moved to the tip end 11 of the cylindrical body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid injector suitable for administering a small amount of liquid by a continuous operation from a priming operation. The drug solution injection according to the present invention is suitable for the case where another drug solution is administered in the middle of the drug solution administration, or for the administration of a drug such as an anticancer drug which may contaminate the operator during a co-injection operation.

[0002]

2. Description of the Related Art When administering a drug solution using an infusion set or a catheter, it is often necessary to administer another drug solution during the administration of the drug solution. For example, it is a case of a contrast agent, a hormone preparation, a peptide preparation, an anticancer drug, a vitamin preparation, etc., and is often performed using a syringe filled with a drug solution in advance, a so-called pre-filled syringe. Conventionally, when such co-injection is required, it has been performed by switching the flow path using a three-way cock or a Y-tube.

However, in the case of such co-injection using a three-way cock or a Y-shaped tube, there is a risk that the drug solution contained therein may leak to the outside during the connection operation or priming of the pre-filled syringe, and in particular, the release of an anticancer agent or the like. In the case of co-injecting a preparation having a high cancer-causing property, there is a problem in operator's health. In addition, when a small amount of an expensive drug solution is administered, the operation is complicated, and the solution is mixed with another drug solution, so that the concentration becomes diluted, so that there is a problem that an effective administration cannot be performed or there is a residual solution.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and is simple in operation and capable of continuously administering a small amount of another chemical during the administration of the chemical. The purpose is to provide a vessel.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventor has made intensive studies and, as a result, has adopted a pre-filled syringe which can change the medication mode by a single operation of keeping the pusher pressed. Having conceived of solving the problem, the present invention has been completed. That is, the present invention provides a cylindrical body having both open ends, and a first gasket on the distal end side which is slidably inserted along the inner wall of the cylindrical body at a predetermined distance with a predetermined distance therebetween. And an intermediate second gasket and a proximal third gasket, wherein the cylindrical body is provided with an inlet and an outlet for a chemical solution on a side wall opposite to the longitudinal axis. A space between the gasket and the third gasket is a liquid medicine chamber filled with a liquid medicine. A base end of the first gasket and a front end of the second gasket are in close contact with each other. Proximal and second
At least one of the distal end of the gasket and the proximal end of the second gasket facing the chemical solution chamber and at least one of the distal ends of the third gasket have a cylindrical shape having an outer diameter smaller than the inner diameter of the cylindrical body. A projection is provided, and the first gasket is in close contact with the second gasket, and has an inlet and an outlet of the chemical solution through a cylindrical projection between the first gasket and the second gasket. Can be moved from the position where is communicated to the distal end of the cylindrical body, the inlet of the chemical solution is open to the lumen of the cylindrical body at the distal end side from the outlet, and the first gasket is When moved to the distal end, the base end of the second gasket and the distal end of the third gasket come into close contact with each other, and the chemical solution passes through the cylindrical projection between the close-contacted second gasket and the third gasket. Exit and entrance About chemical injector comprising adapted to. Here, a pusher for moving the third gasket in the distal direction may be provided at the base end of the tubular body.

The liquid injector according to the present invention is connected to a syringe to inject a contrast medium into blood vessels for myocardial scintigraphy, to co-inject hormonal preparations into a dialysis circuit for treating renal anemia, and to prevent osteoporosis. It can be used for co-infusion of peptide preparations and anti-cancer drugs for the treatment of cancer, and is connected to an infusion bag or bottle via a tube to inject vitamin preparations immediately before starting high-calorie infusion to prevent Maillard reaction It can be used when doing so.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view according to an embodiment of the present invention, and FIGS. 2 to 4 are views for explaining a use state of the drug solution injector of the present invention. As shown in FIG. 1, the liquid injector according to the present invention includes a tubular body 1 and three gaskets 2, 3, and 4 inserted into the tubular body 1. Tubular body 1
Are provided with a chemical solution inlet 13 and an outlet 14 on the side wall opposite to the longitudinal axis, and a chemical solution chamber 5 is provided between the two gaskets 3 and 4. The proximal end of the first gasket 2 and the distal end of the second gasket 3 are in close contact, and the proximal end of the first gasket 2, both ends of the second gasket 3, and the distal end of the third gasket 4, respectively. Cylindrical projections 21, 31, 32, 4 having an outer diameter smaller than the inner diameter of the cylindrical body 1;
1 is provided. The first gasket 2 moves from the position where the inlet 13 and the outlet 14 of the chemical liquid communicate with each other through the columnar projections 21 and 31 to the tip 11 of the cylindrical body 1 in a state of being in close contact with the second gasket 3. It is possible. The inlet 13 for the chemical solution is open to the lumen of the cylindrical body 1 on the distal end side from the outlet 14, and when the first gasket 2 is moved to the distal end of the cylindrical body 1, the cylindrical projections 32 and 41 are formed. The outlet 13 and the inlet 14 of the chemical solution communicate with each other via the.

The cylindrical body 1 has both ends 11 and 12 open, and a chemical liquid inlet 13 and an outlet 14 are provided on the side wall opposite to the longitudinal axis.
It is open to the inner cavity of the tubular body 1 on the tip 11 side. Three gaskets 2, 3, and 4 are liquid-tightly and slidably inserted along the inner wall of the cylindrical body 1, and the first gasket 2 and the second gasket 3 are in close contact with each other. And the second
The gasket 3 and the third gasket 4 are separated by a predetermined distance to form a chemical solution chamber 5. The chemical solution chamber 5 is filled with a chemical solution (omitted). In the figure, reference numeral 15 denotes an annular projection for stopping the movement of the gasket 2.

[0009] At the base end of the first gasket 2 on the side of the front end 11 and at the front end of the second gasket 3 in the middle, columnar projections 21 and 31 having an outer diameter smaller than the inner diameter of the tubular body 1 are provided. The first gasket 2 is slidable from a position where the inlet 13 and the outlet 14 of the chemical solution of the tubular body 1 communicate with each other via the projections 21 and 31 to the tip 11 of the tubular body 1. The projections 21 and 31 may be provided on one or the other instead of both. Therefore, when the projection 31 is provided on the second gasket 3, the first gasket 2 may be a conventional gasket or a conventional gasket provided with the projection 21. The base end of the intermediate second gasket 3 and the third gasket 4 on the base end side
Are provided with cylindrical projections 32 and 41 having an outer diameter smaller than the inner diameter of the cylindrical body 1. When the three gaskets 2, 3 and 4 are moved in the direction of the tip 11, the first The gasket 2 automatically stops at a position where the chemical solution is poured from the chemical solution outlet 14, that is, at a position where the chemical solution chamber 5 communicates with the chemical solution outlet 14 via the projection 32 and does not communicate with the inlet 13. The projections 32 and 41 may be provided on one or the other instead of both. Therefore, for example, when the projection 32 is provided on the second gasket 3, the third gasket 4 may be a conventional gasket or a conventional gasket provided with the projection 41. When the chemical liquid in the chemical liquid chamber 5 is exhausted, the second gasket 3 and the third gasket 4 come into close contact, and the three gaskets 2, 3, and 4 move together and the first gasket 2 reaches the tip end 11. To stop. At this time, the liquid medicine inlet 13 and the liquid medicine outlet 14 communicate with each other via the cylindrical projections 32 and 41.

A pusher 6 for moving the third gasket 4 in the direction of the distal end 11 may be provided at the base end of the tubular body 1. The pusher 6 is not particularly limited, but is preferably a cap-shaped pusher which engages with the outer wall of the tubular body 1 and can be easily moved in the direction of the tip 11 as shown in FIG. Adopted. In the figure, reference numeral 61 denotes an engaging portion, 62 denotes a pressing portion, and the pusher 6 moves the cylindrical member 1 from a position where the annular groove 16 of the cylindrical member 1 and the annular rib 611 of the engaging portion 61 engage.
Is movable to a position where the stepped portion 17 and the annular rib 611 are engaged.

Next, the use of the liquid injector according to the present invention will be described with reference to the drawings. 2 to 4 show an example of use when a contrast agent is injected into a blood vessel. First, a drug solution injector I filled with a contrast agent (not shown) is prepared in the drug solution chamber 5, and a wing needle (not shown) is connected to the outlet 14 of the drug solution. At this time, the first gasket 2 is at a position where the inlet 13 and the outlet 14 of the chemical solution communicate with each other via the projections 21 and 31. Next, as shown in FIG. 2, a tip 7 of a syringe S filled with a physiological saline (not shown, hereinafter, referred to as raw food) is inserted into the inlet 13 of the liquid medicine injector I, and the plunger 8 is inserted. When the is pressed, the raw eclipse of the syringe S flows through the inlet 13, the projections 21 and 31, the outlet 14, and the wing needle of the liquid medicine, and the flow path of the contrast agent is washed (called priming).

After the priming is completed, a winged needle is inserted into a patient's blood vessel to secure the blood vessel. Next, when the pusher 6 of the drug solution injector I is pressed, the third gasket 4 and the drug solution chamber 5 and the second gasket 3 and the first gasket 2 move in the distal direction, and the drug solution chamber 5 is moved into a cylindrical projection. It stops at a position where it communicates with the outlet 14 of the chemical solution via the 32 portion and not with the inlet 13. At this time, the contrast agent in the drug solution chamber 5 is supplied to the outlet 1 of the drug solution.
4 is injected into the blood vessel via the winged needle (see FIG. 3).
When the contrast agent in the medicine room 5 becomes empty, two gaskets 3
4, the three gaskets 2, 3, 4 move integrally to a position where the first gasket 2 reaches the tip 11. At this time, the inlet 13 and the outlet 14 of the chemical solution communicate with each other via the cylindrical projections 32 and 41. Next, when the plunger 8 of the syringe S is pushed, the raw food flows through the inlet 13 of the drug solution, the columnar projections 32 and 41, the outlet 14 of the drug solution and the wing needle, and at this time, the columnar projections 32 and 41, The contrast agent remaining in the drug solution outlet 14 and the wing needle flows into the blood vessel (see FIG. 4).

[0013]

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 by a simple operation of simply holding down the pusher, the operation is simple. In addition, another medicinal solution can be continuously administered during the administration, which is convenient for administering a small amount of an expensive medicinal solution. In this case, the concentration is low because the medicinal solution is not administered so as to be mixed with another medicinal solution. And can be administered effectively. By administering the inexpensive liquid medicine again after the administration of the expensive liquid medicine, the remaining liquid of the expensive liquid medicine can be poured, so that the expensive liquid medicine is not wasted.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a use state of the drug solution injector according to the present invention.

FIG. 3 is a diagram for explaining a use state of the drug solution injector according to the present invention.

FIG. 4 is a diagram for explaining a use state of the drug solution injector according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical body 11 Tip 12 Base end 13 Chemical liquid inlet 14 Chemical liquid outlet 15 Annular projection 16 Annular groove 17 Stepped part 2 First gasket 21 Projection 3 Second gasket 31 Projection 32 Projection 4 Third gasket 41 Projection 5 Chemical solution chamber 6 Pusher 61 Engagement part 611 Annular rib 62 Pressing part 7 Tip 8 Plunger S Syringe I Chemical solution injector

Claims (2)

[Claims] 1. A cylindrical body having both ends open, and a first gasket on a distal end side, which is slidably inserted along an inner wall of the cylindrical body at a predetermined distance with a predetermined distance therebetween. And an intermediate second gasket and a proximal third gasket, wherein the cylindrical body is provided with an inlet and an outlet for a chemical solution on a side wall opposite to the longitudinal axis. A space between the gasket and the third gasket is a liquid medicine chamber filled with a liquid medicine. The base end of the first gasket and the front end of the second gasket are in close contact with each other. At least one of a proximal end and a distal end of the second gasket, and a proximal end and a third end of the second gasket facing the chemical solution chamber.
At least one of the ends of the gasket is provided with a columnar projection having an outer diameter smaller than the inner diameter of the cylindrical body, and the first gasket is in close contact with the second gasket, The liquid medicine can be moved from a position where the inlet and the outlet of the chemical liquid communicate with each other to a tip end of the cylindrical body through a columnar projection between the first gasket and the second gasket, and the inlet of the chemical liquid is more distal than the outlet. The first gasket is moved to the distal end of the cylindrical body, and the proximal end of the second gasket and the distal end of the third gasket are in close contact with each other. And the close second
A liquid injector in which an outlet and an inlet of the liquid medicine communicate with each other via a columnar projection between the gasket and the third gasket. 2. The liquid injector according to claim 1, wherein a pusher for moving the third gasket in a distal direction is provided at a base end of the cylindrical body.