JPH0349263B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flexible plastic container for containing intravenous infusions such as blood and plasma substitutes.

Prior Art In recent years, the use of plastic for infusion containers has rapidly progressed due to the advantages of not breaking even if dropped and being lightweight. Those with an elliptical cross section are often used because they allow the body to be deformed by turning the mouth downward during infusion, allowing infusion to be carried out without supplying air inside.

Problems to be Solved by the Invention The conventional plastic containers mentioned above have a problem in that when the liquid is allowed to drip naturally, the rate of dripping changes depending on the amount of remaining liquid.

To make the dripping rate uniform regardless of the amount of remaining liquid When a container is hung with its mouth facing down, deformation of the body occurs near the liquid level or slightly above it, and this deformation causes the liquid to become uniform. It is preferable to proceed as the surface decreases.

However, in the conventional containers described above, the part that first deforms is not always near the liquid level, and the deformation often begins in the central part of the body, which is lower than the liquid level.

When the deformation first begins in the center of the body, which is lower than the liquid level, the next deformation begins near the liquid level.
Wrinkles occur at the contact points of these two deformed parts, and air pockets form here.

Wrinkles on the body of the container not only make the container look unsightly, but also cause uneven extrusion pressure for the infusion to be dropped, resulting in uneven dripping speed. Furthermore, if the body deforms first, the amount of liquid remaining in the container cannot be determined, and the scale previously attached to the body wall becomes completely unreliable.

Means for Solving the Problems The present invention has been made in consideration of the above-mentioned problems, and it is possible to make the dripping rate of the infusion liquid substantially uniform over the entire amount of dripping, and to deform the infusion into a beautiful external shape. A further object of the present invention is to provide a plastic container for infusions in which a label can be attached without peeling off due to external factors.

The cross-sectional shape is approximately oval, a seat is provided at one end in the vertical direction, and a mouth that can be tightly closed is provided at the other end, and is hollow-molded with flexible plastic. In the plastic container for infusion, a concave portion recessed from the outside to the inside is provided in the vertical direction on both sides of the short axis side of the approximately oval cross-sectional shape, and the end of the concave portion on the seat side is
The mouth of the container is positioned higher than the liquid level when facing downward.

Function: When an infusion is dropped with the mouth facing downward, the deformation of the container begins above the liquid level, and as the liquid level gradually decreases, the deformed portion moves toward the mouth. Also, changes in volume when other infusion fluids are co-injected into the container are easily absorbed by the recesses. Additionally, a label is pasted on the recess.

Example Embodiments of the present invention will be described based on the drawings.

In the figure, 1 is a container, and the container 1 is made of linear low-density polyethylene (L-LDPE) by blow molding to have a substantially elliptical cross-sectional shape. A flat seat part 2 is provided at one end in the vertical direction so as to make it conspicuous. This seat portion 2 is provided with a recess 2a, and a hanging ring 3 is provided in this portion in a bendable and integral manner. Further, the other end of the container 1 is provided with a mouth portion 4 which can be sealed with a stopper 4a.

On both sides of the container 1 in the short axis direction, there is a recess extending inward from the surface of the body from a position higher than the liquid level in the container when the mouth 4 of the container 1 is placed downwards. The substantially planar concave portion 5 is formed so as to cut out the substantially elliptical shape of the body and has a convexly curved portion continuous with the body. This recessed portion 5 is deepest at a portion close to the seat portion 2, and becomes shallower from this portion toward the mouth portion 4 side. The front shape of the recess 5 is a substantially triangular shape with rounded bottom and top corners, and the center of the shape is located closer to the seat 2 than the center of gravity of the container 1.

The container 1 having the above structure has, for example, a capacity of 810 c.c. up to its shoulder, and is filled with 520 c.c. of an infusion solution and sealed tightly. At this time, the recess 5 of the container 1 is slightly bulged out as shown by the first chain line a in FIGS. 2 and 3. In addition, in addition to the so-called basic infusion fluid stored from the beginning, other infusion fluids may be mixed into the container 1 through the stopper 4a depending on the patient, and when these other infusion fluids are mixed in, the recess 5 swells further. Second
It will fit within the generally elliptical outline of the body shown by the second chain line b in the figure. At this time, only the deepest part of the recess 5 remains slightly as a recess. The amount of other infusions mentioned above is generally 520% of the basic infusion.
The maximum is about 130c.c.

When using the container 1 filled with an infusion solution, as shown in FIG. 4, the container 1 is turned upside down and hung by hanging the hanging ring 3 on the seat 2 side on the hanging rod 6. At this time, a space is created on the upper side of the seat 2 of the container 1.
This is the air required to cause natural dripping and typically requires 20% of the container volume.

At this time, the deepest parts of the ends of both recesses 5 of the container 1 are located above the liquid level.

When the lead-out needle 7 is inserted into the plug 4a of the mouth part 4 and the infusion is dripped, as the infusion in the container 1 decreases, the inside of the container 1 becomes negative pressure, and the container 1 becomes as shown in FIG. , deformation starts from the deepest part of the recess 5 inward,
Thereafter, as the amount of infused fluid decreases, the shape and depth of the concave portion 5 and the liquid level gradually deform toward the mouth portion 4 side. At this time, the seat portion 2 on the side of the hanging ring 3 is not deformed due to the rib effect of the edge of the recessed portion 5, and maintains substantially its original shape.

Note that the approximately elliptical cross-sectional shape of the container 1 also includes an ellipse. In addition to L-LDPE, flexible polyolefin resins such as polypropylene and polyethylene may be used as the constituent material.

6 and 7 show another embodiment of the present invention, in which the cross-sectional shape of the recess 5' provided in the side wall of the container 1' is formed into a concave arc shape.

Also in this embodiment, the deformation starts from the recess 5' on the seat 2 side when dropping. Furthermore, in this embodiment, the recess 5' can be largely deformed outward.
A large amount of co-infusion solution can be mixed with the basic infusion solution.

Effects of the Invention According to the present invention, the deformation of the container 1 as the infusion liquid in the container 1 is dripped starts above the liquid level, and then as the liquid level sequentially decreases, the deformation point moves toward the mouth 4 side. Since it moves, the dropping speed can be made substantially uniform over the entire amount of dropping, and it is deformed with a beautiful external shape without wrinkles occurring during dropping. In addition, the capacitance change due to mixed injection is
It can be absorbed easily. Further, by pasting a label on the recesses 5, 5', the label can be kept retracted from the outer surface of the container 1 at all times, and the label can be prevented from peeling off due to external factors.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a front view, FIG. 2 is a side view, and FIG.
4 and 5 are partially broken sectional views showing usage conditions, FIG. 6 is a front view showing another embodiment, and FIG. 7 is a sectional view taken along the - line in FIG. 6. It is a diagram. 1 is a container, 2 is a seat, 3 is a hanging ring, 4 is a mouth,
5 and 5' are recessed parts.

Claims (1)

[Scope of Claims] 1. A plastic material having a substantially elliptical cross-sectional shape, provided with a seat portion 2 at one end in the vertical direction, and a mouth portion 4 that can be sealed tightly at the other end, and further made of flexible plastic. In a plastic infusion container hollow-molded in a method, recesses 5 and 5' recessed from the outside to the inside are provided in the vertical direction on both sides of the short axis side of the approximately oval cross-sectional shape of the container 1, A plastic container for infusions characterized in that the ends of the recesses 5, 5' on the seat 2 side are located at a higher level than the liquid level when the mouth 4 of the container 1 is placed on the lower side. 2. The plastic container for infusion according to claim 1, wherein the center of the front shape of the recess 5 is located closer to the seat 2 than the center of gravity of the container 1.