JP2008029767A - Intravenous drip outlet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intravenous drip outlet which keeps a stop plug and a drip guide tube molded monolithically to reduce the number of required parts with a fit-in structure employed for the stop plug and the drip guide tube to more effectively prevent the drip from leaking out. <P>SOLUTION: In an intravenous drip outlet 10 consisting of a cap 20 with varying colors according to the kind of intravenous drip, a stop plug 30 pierced through with an instillation needle, and a drip guide tube 40 installed on an intravenous drip bottle, the stop plug and the drip guide tube are manufactured monolithically. Also, grooves are formed on the inner drip guide tube wall with the stop plug protruded so that they can fit together. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides an infusion for a drip comprising a cap whose color can be changed depending on the type of infusion drug solution to be accommodated, a sealing stopper that pierces the infusion needle, and a liquid introduction cylinder attached to the container body of the infusion solution. More particularly, the present invention relates to a liquid injection outlet for infusion in which a sealing stopper and a liquid guiding cylinder are integrally formed.

  Conventionally, the drip liquid outlet is composed of three parts including a cap, a sealing plug, and a liquid guiding cylinder. The cap is configured to change the color depending on the type of the chemical liquid stored in the drip container and to distinguish the internal chemical liquid. The sealing plug is made of a soft resin, and has a structure in which the liquid does not leak when the needle is pierced and the chemical liquid is poured out. In addition, in order to ensure liquid leakage between the sealing plug and the liquid guiding cylinder, the protrusion formed on the liquid guiding cylinder is fitted into the groove formed on the sealing plug so that the liquid leakage occurs. Was preventing.

However, even if a structure in which the liquid guiding cylinder and the sealing plug are closely fitted and sealed to prevent liquid leakage, complete sealing cannot be achieved with parts of two different materials. There was a possibility that liquid leakage would occur.
In addition, in order to improve the sealing performance, when a complicated configuration is added to the fitting portion between the sealing plug and the liquid guiding cylinder, the needle is inserted obliquely when the needle is inserted to dispense the liquid. In this case, there is a possibility that the needle tip scrapes the sealing plug and the soft resin body is mixed into the chemical solution. Furthermore, it takes a lot of time and effort in assembly work to combine a sealing plug that is a small article and has a complex structure with unevenness and a liquid guiding cylinder.
In addition, although the technology for integral molding of artificial resin products is advancing, the liquid injection outlet for infusion is a component with different colors and materials, and has a complex structure with irregularities to prevent liquid leakage It was unthinkable to fully utilize the improved technology.

JP-A-8-91414

  In order to solve the above-described problems, an object of the present invention is to provide a drip liquid spout without a liquid leak, in which a sealing plug and a liquid guiding cylinder are completely formed integrally, and the number of articles is reduced. . It is another object of the present invention to provide an infusion liquid spout having an improved effect of preventing chemical leakage by adding a fitting structure between a sealing plug and a liquid guiding cylinder.

  In order to achieve the above object, the infusion liquid spout according to the present invention comprises a cap whose color can be changed depending on the kind of the medicinal liquid to be accommodated, a sealing stopper that pierces the infusion needle, and an infusion liquid. In the drip liquid spout formed by the liquid guide cylinder attached to the container body, the sealing stopper and the liquid guide cylinder are integrally formed.

  The drip liquid outlet has a groove formed in the liquid introduction cylinder so as to prevent chemical leakage, and a protrusion corresponding to the groove is protruded from the sealing plug. It is a structure fitted in the groove.

  Further, the sealing plug is made of a soft resin cylindrical body, and an annular protrusion that fits into the groove of the liquid guiding cylinder is projected on the container side surface of the cylindrical body. This is a structure in which an annular groove that engages with an engagement protrusion provided on the cap is provided on the surface of the liquid discharge side.

  Further, the liquid guiding cylinder is formed of a cylindrical body provided with a hollow liquid guiding path made of a hard resin whose outer side surface is gradually thickened toward the liquid guiding path outlet side. In this structure, a cylindrical cavity that matches the outer shape is formed on the outlet side, and an annular groove that fits the protrusion of the sealing plug is formed on the bottom surface of the cylindrical cavity.

  In addition, the sealing plug and the liquid guiding cylinder formed integrally move the wedge connected to the cavity by air or hydraulic pressure after injecting the first resin forming the liquid guiding cylinder on the core pin side. Thus, the cavity is retracted from the core pin, a space is provided between the core pin, and a second resin that forms a sealing plug is injected to form a unitary structure.

Since the liquid injection outlet for infusion according to the present invention is configured as described in detail above, the following effects are achieved.
1. The number of parts can be reduced by integrally molding the sealing plug and the liquid guiding cylinder. This saves the labor of assembling the sealing plug and the liquid guiding cylinder, thereby reducing the cost. Furthermore, liquid leakage between the sealing plug and the liquid guiding cylinder can be prevented.
2. In addition to integral molding, the structure of the sealing plug and the liquid guide cylinder is a fitting structure of the protrusion and the groove, so that the sealing property is further increased and liquid leakage can be prevented more reliably. The fitting is stronger than the conventional structure in which the liquid guiding cylinder is incorporated into the sealing plug, and the double fitting seal in which the protrusion of the sealing plug fitted into the groove of the liquid guiding cylinder is pressed and fixed by the cap. Since it is a stop structure, the sealing performance and integrity are strong.
3. Providing a protrusion on a conventional sealing plug is inappropriate from the viewpoint of preventing liquid leakage, and even with a structure in which a groove is provided on the sealing plug, the sealing performance is not reliable. However, the structure in which the sealing plug is wrapped with the liquid guiding cylinder and the cap improves the sealing performance, and the protrusion of the sealing plug is fitted into the groove of the liquid guiding cylinder. Even when pierced, the soft resin piece of the sealing plug is not mixed into the chemical solution.
4). Since the inside of the liquid guiding cylinder that continues to the coupling portion with the sealing plug is a uniform cylindrical cavity, the flow of the chemical liquid is smooth. The cap is placed on the liquid guiding cylinder, and since it is made of the same hard resin, the assembling work is simple.
5. By moving the cavity back by air or hydraulic pressure and a wedge, the amount of movement of the cavity can be increased to 4 mm to 6 mm, so that this type of artificial resin product can be integrally molded. In addition, since the amount of movement has increased, it has become possible to form a fitting structure, and it has become possible to achieve strong sealing and sealing between different materials.

In the following, the drip liquid spout according to the present invention will be described in detail according to the embodiments shown in the drawings.
FIG. 1 is a cross-sectional view of a drip liquid spout cap, a sealing plug, and a liquid guiding cylinder in the present invention. FIG. 2 is a front view of the sealing stopper of the drip liquid outlet and the liquid guiding cylinder of the present invention. FIG. 3 is a diagram showing an integral molding process of the drip liquid outlet according to the present invention. FIG. 4 is a schematic diagram of a cavity back system using an air cylinder and a wedge.
As shown in FIG. 1, the drip liquid outlet 10 of the present invention includes a cap 20, a sealing plug 30, and a liquid guide cylinder 40.

  As shown in FIG. 1, the cap 20 has a cylindrical protrusion 22 on the outlet side toward the chemical liquid side that fits the sealing plug 30, and the integrally formed sealing plug 30 and liquid guide cylinder. The body 40 is fitted so as to cover it. The center of the cap 20 forms a circular space, and a sealing plug 30 made of a soft resin appears in the center of the cap 20, and the needle is pierced from the circular empty portion.

  The cap 20 is formed in several different colors depending on the type of the chemical solution so that the chemical solution contained in the drip container can be distinguished by the color. In addition to the name of the drug solution written on the drip container, it plays a role to prevent double misidentification of the drug solution contained by the difference in the color of the cap, and contributes to further safety. The cap 20 is made of a hard resin.

The sealing plug 30 is a plug that pierces a needle that pours out a liquid medicine in a drip container formed of a soft resin material. In order to pierce the needle, the central part is depressed, and the structure is easy to pierce.
As shown in FIG. 1 and FIG. 2, in order to seal the liquid guiding cylinder, a cylindrical shape that is fitted to the liquid outlet portion of the liquid guiding cylinder is formed, and in order to more closely contact the cap 20 The groove 34 fitted to the provided protrusion 22 is provided on the front surface (liquid introduction outlet side), and the protrusion 32 fitted to the groove 48 provided on the liquid introduction cylinder 40 is provided on the rear surface (infusion container side). ).

The protrusion 32 fitted to the liquid guiding cylinder is located on the chemical liquid side of the sealing plug, and forms a concentric annular cylindrical shape surrounding the central portion through which the needle is inserted.
A concave portion is formed in the center of the sealing plug 30 on the liquid outlet side, and the portion through which the needle is pierced from the outside is easy to understand. In addition, an annular groove 34 that engages with the engaging protrusion 22 provided on the cap 20 is provided on the surface of the liquid discharge side.

  The liquid guide cylinder 40 is a cylinder formed of a hard resin material that guides the chemical liquid that has entered the drip container to the outlet. A hollow liquid guide path 42 is formed inside the liquid guide cylinder. Further, the outer side surface 44 is formed in a tapered shape so that it gradually becomes thicker from the side of the chemical solution where the infusion container containing the chemical solution is provided toward the side of the liquid introduction outlet to which the cap is attached.

In addition, a columnar cavity 46 that matches the outer shape of the sealing plug is provided on the liquid introduction outlet side so that the sealing plug 30 fits inside, and the sealing plug 30 is fitted into this columnar cavity. Is sealed.
An annular groove 48 is cut on the chemical side of the cylindrical cavity 46, and is configured to be fitted with an annular protrusion 32 provided on the sealing plug 30.

  The sealing plug 30 and the liquid guiding cylinder 40 are formed by integrally molding two resins of different materials, ie, a soft resin and a hard resin, using a cavity back method.

Next, the integral molding of the sealing plug 30 and the liquid guide cylinder 40 by the cavity back method will be described in detail along the embodiment shown in FIGS.
In the state where the cavity 52 is in contact with the core pin 54 (cavity advance state), the primary resin forming the liquid guiding cylinder is injected from the primary side gate 56 from the primary side gate 56 (FIG. 3A). After molding the primary resin, a space is formed in the core pin 54 and the cavity 52 by retracting the cavity (FIG. 3B). A secondary resin for forming the sealing plug 30 is poured into the space from the secondary side gate 58 (FIG. 3C).

The retraction of the cavity 52 is performed by moving the wedge 64 to which the cavity is connected by the air cylinder 60, as shown in FIG. In FIG. 4, the wedge is moved by the air cylinder, but a structure in which the wedge is moved by a hydraulic cylinder may be adopted.
When the two wedges 62 and 64 are combined and one of the combined wedges 62 is advanced by the air cylinder 60, the other wedge 64 moves in a direction perpendicular to the traveling direction of the wedge 62. The wedge 64 is connected to the fixed plate 70 together with the cavity 52, and when the wedge 64 moves, the spring 72 provided on the fixed plate 70 contracts, and accordingly, the cavity 52 moves in the direction of retreating from the core pin 54, A space for injecting secondary resin is created.
With the wedge moving structure by the air cylinder 60, the moving amount of the cavity receding can be increased to 4 mm to 6 mm. This movement distance has not been realized in the past, and is an improved technique that enables integral molding of additional members.

The resin injected from the secondary side gate 58 fills the space without any gaps, and integrally forms a liquid guide cylinder and a sealing plug made of two kinds of resins that are completely in close contact with the primary resin.
After molding, the product is cooled, opened and separated from the cavity 52 (FIG. 3 (d)). Further, the product is ejected by the ejector sleeve 68 and removed from the core pin 54 (FIG. 3 (e)).

  Since the drip liquid outlet portion formed in this way uses a resin in a portion of the drip container that comes into contact with the chemical liquid, it is strong against water / chemical liquid and hardly corrodes. Further, the sealing plug 30 and the liquid guiding cylinder 40 are structured to be surely prevented by fitting with the protrusions and grooves.

Sectional drawing of the cap, sealing stopper, and liquid introduction cylinder of the liquid spout for infusion of the present invention The front view of the sealing stopper of the drip liquid outlet of the present invention, and the liquid guiding cylinder Process diagram of integral molding of the present invention Schematic diagram of the cavity back system with air cylinder and wedge

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Infusion liquid spout 20 Cap 22 Cap protrusion 30 Seal plug 32 Seal plug protrusion 34 Seal plug groove 40 Liquid introduction cylinder 42 Liquid introduction path 44 Outer side face 46 Cylindrical cavity 48 Tube groove 52 Cavity 54 Core pin 56 Primary side gate 58 Secondary side gate 60 Air cylinder 62, 64 Wedge 66 Parting line 68 Ejector sleeve 70 Fixing plate 72 Spring

Claims (5)

  At the drip liquid outlet comprising a cap whose color can be changed depending on the type of drip medicinal solution to be accommodated, a sealing plug through which a drip needle is inserted, and a liquid guide cylinder attached to the container body of the drip liquid The liquid spout for infusion, wherein the sealing plug and the liquid guide cylinder are integrally formed   The drip liquid outlet has a groove formed in the liquid introduction cylinder so as to prevent chemical leakage, and a protrusion corresponding to the groove is protruded from the sealing plug, and the protrusion is formed in the groove. The infusion liquid spout according to claim 1, which is fitted to a strip.   The sealing plug is made of a soft resin cylindrical body, and an annular ridge projecting into the groove of the liquid introducing cylinder is projected on the container side surface of the cylindrical body. 3. The drip liquid spout according to claim 1, wherein an annular groove that engages with an engagement protrusion provided on the cap is provided on the liquid side surface.   The liquid guide cylinder is formed of a cylinder provided with a hollow liquid guide path made of a hard resin whose outer side surface is gradually thickened toward the outlet side of the liquid guide path. The combined cylindrical cavity is formed on the outlet side, and an annular groove that fits with the projection of the sealing plug is formed on the bottom surface of the cylindrical cavity. Liquid drip outlet for infusion according to   The sealing stopper and the liquid guiding cylinder formed integrally are formed by injecting a first resin forming the liquid guiding cylinder on the core pin side, and then moving the wedge connected to the cavity by air or hydraulic pressure. 5 is retreated from the core pin, a space is provided between the core pin, and a second resin forming a sealing plug is injected to form a single piece. Liquid drip outlet for infusion according to paragraph

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