JP2965810B2 - Medical bag and method for manufacturing medical bag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical bag comprising a bag portion formed of an inflation tube formed by inflation molding and a plug attached to an end of the bag portion. Regarding improvement.

[0002]

2. Description of the Related Art At present, a medical bag used is formed by cutting an inflation tube having a thickness of 100 to 600 .mu.m into a predetermined length and injection-molding a thermoplastic resin into an opening of the tube. It is manufactured by inserting a plug made of resin, fusing and sealing both ends of the tube into a flat plate shape with a mold, and forming a bag portion between the fused portions. On the surface of the fused portion, both surfaces were formed flat, or both surfaces were formed with a convex portion and a concave portion in which the depth H of the embossed surface was uniformly formed.

[0003]

However, in the case of a medical bag in which both surfaces of the fused portion are formed flat, when the both ends of the tube are overlapped and pressed by a mold, the tube is fused. -It is easy to get air into the place where the valve is overlapped. Also, if the mold is pressed too strongly, the thickness becomes thin, and the strength of the fused portion tends to be weak. Furthermore, when handling a medical bag filled with a drug solution, it slips easily. During high-pressure sterilization, there was a problem that bags were easily blocked with each other.

[0004] In the case of a medical bag in which convex portions and concave portions are formed on both surfaces of the surface of the fused portion, if the positions of the concave portion on one surface and the concave portion on the other surface overlap or approach each other, the overlapped tube is formed. Some of the pieces become extremely thin. On the other hand, if the convex portion of one surface and the convex portion of the other surface overlap or approach each other, a thick portion is formed in a part of the overlapped tubes,
When welding is performed by pressing with a mold, an unfused portion between the tubes cannot be completely formed because the tube cannot be completely fused. When the depth of the embossed surface is uniform, air is easily trapped in the folds at both ends of the tube, so that a tunnel leak occurs. In order to prevent this, the portion of the mold that comes into contact with the fold of the tube is formed in a convex shape so that air is pushed out so as to strongly hit the fold of the tube. If the fold of the tube hits the concave part of the mold,
But it was easy to tunnel leak. As described above, it is necessary to finely adjust the positioning of the mold so that tunnel leak does not occur, but this is difficult.

[0005] As described above, if a thin portion or an unfused portion is formed in the fused portion, the strength of the fused portion is reduced, which is unfavorable because it causes liquid leakage. Especially the unfused part is
When formed at the folds at both ends of the bag, a tunnel-shaped hole was opened from the inside of the bag to the outside of the bag, and the contents liquid sometimes leaked. The inventor of the present invention has made intensive studies in order to solve the above-mentioned problems, and as a result, has arrived at the following invention.

Accordingly, the applicant has filed a “medical bag and a method of manufacturing the same” which has solved the above-mentioned problems.
No. 39, Japanese Patent Application No. 4-98740 and Japanese Patent Application No. 4-165
No. 424, there is a very small probability that the concave portions of the fusion portion formed at the end of the bag portion are regularly arranged in a single row, but there is only a small probability It is supposed that the bag part cannot be pressed down and causes a leak. Therefore, the present inventor has made intensive studies in order to solve the above problems, and as a result, has arrived at the next invention.

[0007]

Means for Solving the Problems [1] In the present invention, a plug is attached to one end of a bag made of a thermoplastic synthetic resin, and a projection is formed on a fusion portion formed at both ends of the bag. Forming a recess, arranging the recesses in a plurality of rows in the lateral direction of the bag,
And the recesses forming the other rows are longer than the length of the bag.
Arranged so that at least a part thereof overlaps in the direction,
Provided is a medical bag formed so that a part of an overlapped concave portion is overlapped with a line of an end portion of a fused portion.

[2] In the present invention, the concave portions according to the above [1] are formed in a rectangular shape and formed in a plurality of rows, and the concave portions in each row are formed along the lengthwise line of the bag portion by 0.2. From 1.0m
A medical bag formed so as to overlap m is provided.

[3] The present invention provides the medical bag according to the above [1] or [2], wherein a strong pressing portion is formed at an interval of 1 to 3 mm from a boundary portion between the bag portion and the fused portion.

[4] The present invention provides a method for producing the medical bag 1 according to the above [1] to [3], comprising the following steps. (1) a step of cutting the inflation tube extruded from the mold into a predetermined length; (2) a step of inserting a plug into one opening of the tube; −
A step in which both open ends of the tube are heated and pressurized and fused between a mold having a concave portion and a convex portion corresponding to the convex portion and the concave portion formed on the tube pressing surface;

[5] The present invention provides a method for producing a medical bag according to the above [1] to [3], comprising the following steps. (1) a step of fusing the inflation tube extruded from the mold by heating and pressing between the molds described in [4] above so as to form a bag of a predetermined size; (2) Press-cutting the fused portion of the tube, cutting each bag and opening one end of the bag, (3) inserting a plug into the opening of the bag, (4) plugging Welding the part to the bag,

FIG. 1 is a schematic view of a medical bag of the present invention.
The medical bag 1 includes a bag portion 4 made of a thermoplastic synthetic resin and a plug portion 3 attached to one end of the bag portion 4. Fusion portions 2 are formed at both ends of the bag portion 4. As shown in FIG. 2 (a partially enlarged view of the fusion portion in FIG. 1), the fusion portions 2 have convex portions 5.
And a concave portion 6 are formed. The recess 6 is located on the side of the bag 4
Recesses 6 and other rows are arranged in a plurality of rows so as to form one row.
Is formed at least in the longitudinal direction of the bag portion 4.
The concave portions 6 are arranged so as to partially overlap each other.
The portion is formed so as to extend over the line at the end of the fused portion .
As a result, at least the concave portion 6 has the line A at the end of the fused portion 2,
No matter where B and C come, the end of the bag 4 is securely welded.

The shape of the convex portion 6 is not limited to a rectangular shape as shown in FIG. 2, but may be any shape as long as it is arranged as described above and extends along the line at the end of the fused portion 2. All shapes such as a square, a circle, and an ellipse can be adopted.

As shown in FIG. 3 (a partially enlarged view of the fused portion in FIG. 1), the recesses 6a are formed in a rectangular shape to form a plurality of rows, and the recesses 6a in each row are formed in the bag portion 4. It may be formed so as to overlap by 0.2 mm to 1.0 mm along the line in the length direction (D1 is the overlapping width in FIG. 3). The distance D2 between the recesses 6a is set from 0.5 mm to 1.0 mm. As a result, at least a plurality of positions of the concave portions 6a in each row are applied to the lines A, B, and C at the end of the fusion portion 2 at any position, so that the end of the bag portion is securely welded.

FIG. 4 (a partially enlarged view of the fused portion in FIG. 1)
1 to 3 from the boundary portion 7 between the bag portion 4 and the fused portion 2 as shown in FIG.
By forming the strong pressing portion 8 at an interval D3 of mm, when the bag portion 4 and the strong pressing portion 8 are simultaneously sealed, the folded portions 9 on both sides (see FIG. 5 (A-A cross-sectional view of FIG. 1)). ) Can be easily escaped.

The medical bag 1 of the present invention is manufactured, for example, as follows. Inflation extruded from the mold
The tube is cut into a predetermined length, and the plug 3 is inserted into one opening of the tube. Then,
The two open end portions of the tube are sandwiched between a mold having a concave portion and a convex portion corresponding to the convex portion 5 and the concave portion 6 formed on the tube pressing surface, and are heated and pressurized to be fused. Form 2 As a result, the plug 3 is attached to the end of the medical bag 1, and the bag 4 is formed between the fusion parts 2, 2.

The medical bag 1 of the present invention can be manufactured as follows. As shown in FIG. 6, the inflation tube extruded from the mold is sandwiched between the molds by heat and pressure so as to form a bag of a predetermined size and fused to form a bag. Form 2 Subsequently, as shown in FIG. 7, the fused portion 2 of the tube is press-cut, cut into each bag portion 4, and one end of the bag portion 4 is opened. As shown in FIG. 8, the plug part 3 is inserted into the opening 11 of the bag part 4, and FIG.
As shown in (1), the plug 3 is fused to the bag 4 (12 is a plug fusion part).

In the case of forming the strong pressing portion 8 in the present invention, the pressing surface corresponding to the strong pressing portion 8 is set at a distance of 0.1 mm from other pressing surfaces.
A mold formed from 2 mm to 0.3 mm higher is used.
Further, the fusion-bonded portion 2 includes both the one in which a convex portion and a concave portion are formed on one surface and the other surface is formed flat, and the one in which a convex portion and a concave portion are formed on both surfaces. In the latter case, the fused portion 2 sandwiches the tube between the upper and lower molds having a convex portion and a concave portion corresponding to the convex portion 5 and the concave portion 6 of the fused portion 2 on the tube pressing surface. In the former case, the fused portion 2 is formed by forming a tube on a tube pressing surface with a mold having a convex portion and a concave portion corresponding to the convex portion 5 and the concave portion 6 of the fused portion 2. The tube pressing surface is formed between flat molds.

[0019]

Effects of the Invention

(1) Since the concave portion is formed so as to cover the line at the end of the fused portion, the end of the bag can be securely sealed, and no leak occurs. (2) When the bag portion and the strongly pressed portion are simultaneously sealed, the air sealed in the folded portion 9 can be expelled, and tunnel leak can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a schematic view of a medical bag of the present invention.

FIG. 2 is a partially enlarged view of a fusion bonding portion in FIG. 1;

FIG. 3 is a partially enlarged view of a fusion splicing part in FIG. 1;

FIG. 4 is a partially enlarged view of a fusion bonding portion in FIG. 1;

FIG. 5 is a sectional view taken along line AA of FIG. 1;

FIG. 6 is a schematic view of a manufacturing process of a medical bag.

FIG. 7 is a schematic view of a manufacturing process of a medical bag.

FIG. 8 is a schematic view of a manufacturing process of a medical bag.

FIG. 9 is a schematic view of a manufacturing process of a medical bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Medical bag 2 Fusion part 3 Plug part 4 Bag part 5 Convex part 6 Concave part 7 Boundary part of a bag part and fusion part 8 Strong press part 9 Fold part 10 Air 11 Opening part 12 Port fusion part

Claims (5)

(57) [Claims] 1. A plug portion is attached to one end of a bag made of a thermoplastic synthetic resin, and a convex portion and a concave portion are formed in a fusion portion formed at both ends of the bag portion. Laterally
A plurality of rows are arranged, and the recesses forming one row and the other rows are formed.
Recesses overlap at least partially in the length direction of the bag
The medical bag is arranged in such a manner that a part of the overlapped concave portion is formed on a line at an end of the fused portion. 2. The recesses according to claim 1 are formed in a rectangular shape and are formed in a plurality of rows, and the recesses of each row overlap by 0.2 to 1.0 mm along a line in the length direction of the bag portion. A medical bag characterized by being formed as described above. 3. 1 to 3 mm from the boundary between the bag portion and the fused portion
3. The medical bag according to claim 1, wherein a strong pressing portion is formed at an interval. 4. The method for producing a medical bag according to claim 1, comprising the following steps. (1) a step of cutting the inflation tube extruded from the mold into a predetermined length; (2) a step of inserting a plug into one opening of the tube; A step of heating and pressurizing and fusing both open end portions of the tube between a mold having a concave portion and a convex portion corresponding to the convex portion and the concave portion on the tube pressing surface, 5. The method for manufacturing a medical bag according to claim 1, comprising the following steps. (1) a step of fusing the inflation tube extruded from the mold by heating and pressing between the molds so as to form a bag of a predetermined size; Press cutting the fused portion of the tube, cutting each bag and opening one end of the bag, (3) inserting a plug into the opening of the bag, (4) plugging Welding the bag to the bag,