JPH09248327A - Bag for medical treatment and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to make the welding conditions of a connecting member and a sheet, and a transfusion port and the sheet and a protector uniform by welding the transfusion port crowned with the protector, then welding the transfusion port and the base part of a tubular member and sheets in contact therewith, then forming a bag-shaped body. SOLUTION: The transfusion port 3 crowned with the protector 4 is pressed by an electrode 8a having a pressing groove 15 and a mouth part mold 8 arranged with an insulator 8b therebetween to weld the transfusion port 3 and the protector 4. In succession, the transfusion port 3 which is crowned with the protector 4 and is welded to the protector 4 and the base part of a blood transfer tube are mounted at a jig and the assembly is placed between the synthetic resin sheets 6 from an upper direction. The sheets 6 are pressed by the electrode 8a having press grooves 15 and the mouth part mold 8 arranged with the insulator 8b therebweem, by which the base part 5 of the transfusion port 3, the protector 4 and the sheets 6 are welded. The sheets 6 are pressed by upper and lower frame molds to form secondary welded parts, by which the bag-shaped body is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved medical bag for storing blood, liquid medicine, etc. and a method for manufacturing the medical bag.

[0002]

2. Description of the Related Art A medical bag currently in use is constructed by welding a protector 134 having an infusion port 133 mounted on an upper portion of a bag-shaped main body 132. For this reason, manufacturing has been performed by the following steps.

(1) Two synthetic resin sheets are molded into a hat-shaped protector 134 by a molding machine, and further, an infusion port 13 attached to a jig 137 in the protector 134.
Step (FIG. 13) of loading 3 with the protector 134 of (2) and (1) placed between the two synthetic resin sheets 136, and the protector 134 and the base 135 of the infusion port 133.
And a step of pressing the upper end portion of the sheet 136 in contact therewith with the upper and lower mouth die 138 to weld (FIG. 14),
(3) A step of pressing the sheet 136 of (2) by upper and lower molds (not shown) to form the bag-shaped main body 132 (FIG. 15),

However, there were the following problems in manufacturing these medical bags. When the protector 134 is welded to the sheet 136 in the step (2), the protector 134 attached to the welder pin 137 must be inserted from the lower side of the sheet 136. Further, the welder pin 137 is mounted on the turntable and rubs the inside of the seat 136 together with the protector 134 mounted on the welder pin 137, which is not preferable. To remove these obstacles, the protector 134 attached to the welder pin 137 from the upper side of the seat 136 is used.
However, since the diaphragm is formed inside the infusion port 133, the welder pin 137 cannot be deeply inserted. It was difficult to adjust the welding strength when the protector 134 and the sheet 136 were welded in the step (2). In addition, the applicant proposed in 1994 Japanese Patent Application No. 287100 a method for producing a medical bag comprising the following steps. (1) An infusion port covered with a protector was placed between two synthetic resin sheets from above, and a base portion of the infusion port and a sheet in contact with this were formed with pressing grooves in the length direction of the infusion port. A step of pressing and welding with electrodes and upper and lower mouth die configured by arranging an electrode and an insulator having a groove formed in the lateral direction of the pressing groove between the electrodes; (2) The (1) Step of pressing the sheet by the upper and lower frame dies to form a bag-shaped main body. However, in the above invention, the synthetic resin sheet 6 including the infusion port 3 capped with the protector 4 and the connecting member 13 (tubular member) is formed. When applying a high frequency by sandwiching between them and welding, one sheet (sheet 6) on one side of the tube (connection member 13) and two sheets (sheet 6 and protector on one side of the tube (infusion port 3)) 4) Welding at the same time However, since there are two ways of transmitting the high frequency, that is, the sheet 6 to the connecting member 13 and the sheet 6 to the protector 4 and then the infusion port 3, there are welding conditions for the connecting member 13 and the sheet 6, the infusion port 3 and the sheet 6 and the protector 4. Was difficult to make uniform. The inventor of the present invention has made intensive studies in order to solve the above-mentioned problems, and has arrived at the following invention.

[0005]

[Means for Solving the Problems]

[1] The present invention provides a method for producing a medical bag, which comprises the following steps. (1) By arranging an infusion port capped with a protector, an electrode having a pressing groove formed in the longitudinal direction of the infusion port, and an insulator having a groove portion formed in the lateral direction of the pressing groove between the electrodes. Step of pressing and welding with the upper and lower mouth molds configured, (2) Place the infusion port and the tubular member capped with the protector of (1) between two synthetic resin sheets from above. Then, the infusion port and the base of the tubular member and the sheet in contact therewith are formed with an electrode having a pressing groove formed in the longitudinal direction of the infusion port and the tubular member, and a groove is formed between the electrode in the lateral direction of the pressing groove. A step of pressing and welding with upper and lower mouth die configured by arranging an insulator,
(3) A step of pressing the sheet of (2) by upper and lower frame molds to form a bag-shaped main body, [2] The present invention is characterized in that the base of an infusion port provided with a protector on the upper part of the bag-shaped main body is It is welded and fixed, and the height H is 0.05 to 1 mm and the width W is 0.2 to 10 on the surface of the base of the infusion port.
A medical bag having a mm protrusion is provided. [3] The present invention provides the medical bag according to [2], wherein the base of the blood transfer tube is welded and fixed to the upper portion of the bag-shaped main body.

[0006]

1 is a schematic view of a medical bag 1 according to the present invention. The medical bag 1 is a bag-shaped main body 2 made of a flexible synthetic resin, and a protector 4 is covered on the upper part of the bag-shaped main body 2. It is configured by welding and fixing the base portion 5 of the infusion port 3 that is capped, and a projection 12 is formed on the surface of the base portion 5 of the infusion port 3. The protrusion 12 is formed like a bank in the lateral direction of the infusion port 3. Only one thick protrusion 12 may be formed, or two or three thin protrusions 12 may be formed.

Next, a method of manufacturing the medical bag 1 will be described. As shown in FIG. 2, the infusion port 3 covered with the protector 4 is formed with an electrode 8a having a pressing groove 15 formed in the longitudinal direction of the infusion port 3, and a half in the lateral direction of the pressing groove 15 between the electrode 8a. The infusion port 3 and the protector 4 are welded by pressing the upper and lower mouth die 8 configured by arranging the insulator 8b having the circular groove 9 to apply a high frequency.

As shown in FIG. 2, a high frequency is supplied from a power source 16, but in the mouth die 8, the opposing electrodes 8a of the upper and lower mouth die 8 have the same polarity (for example, the earth pole (E) and the earth pole). (E) or the feed electrode (S) and the feed electrode (S)), and the electrodes 8 are arranged in the longitudinal direction of the infusion port 3 via the insulator 8b.
a are alternately different polarities (for example, a ground electrode (E), a feed electrode (S), a ground electrode (E) ... Or a feed electrode (S),
Wiring is performed so that it becomes the ground electrode (E), the supply electrode (S), ... When the power supply 16 is operated as described above and a high frequency is applied between the electrodes 8a, a dielectric heating phenomenon occurs in the groove of the insulator 8b between the earth electrode (E) and the feed electrode (S). However, the surface of the sheet constituting the protector 4 exposed to this begins to soften, and further induces softening of the lower layer of the sheet, the infusion port 3. Further, on the surface of the sheet sandwiched by the mold 8, the repulsive force accumulated at the time of pressing and sandwiching the upper and lower mouth molds 8 is sequentially released by the softening of the sheet, but the deep layer portion of the opposite side sheet is Since the repulsive force acts in the outer diameter direction of the tube such as the infusion port 3, the softened sheet and tube are successively driven into the groove portion 9 and the protruding portion 1
2a.

Under the mouth dies 8, which come into contact with the sheet, a strong pressure is exerted by sandwiching between the upper and lower parts, and the heat generated in the groove portions 9 on both sides is transmitted, so that the pressure and the dielectric heat generation should be controlled. This makes it possible to form an appropriate welded portion. As described above, since the transmission of heat from both sides and the strong pressure due to the sandwiching between the upper and lower sides are utilized, the gaps between the protrusions 12a (bank-shaped welding marks) are completely sealed as shown in FIG. The part 14a is formed. In FIG. 3, the inside of the rectangular frame is welded (welding portion 10a). In order to form two welded portions 14a as shown in FIG. 3, an insulator 8b in which a groove 9 is formed between four electrodes 8a as shown in FIG.
It is necessary to arrange three. FIG. 4 shows a cross section of the welded portion 10a in this case.

Subsequently, as shown in FIGS. 5 and 6, the infusion port 3 capped with the protector 4 and welded to the protector 4 and the base portion 13 (tubular member) of the blood transfer tube 20.
Is attached to a jig 7 (parts feeder), and these are placed between two synthetic resin sheets 6 from above. As shown in FIG. 7, the sheet 6 is formed with an electrode 8a in which a pressing groove 15 is formed in the lengthwise direction of the infusion port 3, and a semicircular groove portion 9 is formed between the electrode 8a in the lateral direction of the pressing groove 15. By pressing the upper and lower mouth molds 8, 8 configured by arranging the insulated body 8b to apply a high frequency, the base 5 (base 13) of the infusion port 3 (blood transfer tube 20)
8 and the protector 4 and the sheet 6 in contact therewith are shown in FIG. 8 (FIG. 9 is a partially enlarged view of FIG. 8, and FIG. 10 is a sectional view taken along line BB of FIG. 9).
Weld like this. When a high frequency is applied between the electrodes 8a by operating the power source, an electric field is generated in the groove portion of the insulator 8b between the earth electrode (E) and the supply electrode (S), and the surface of the sheet 6 exposed to the electric field. Starts to soften due to dielectric heating, and further induces softening of the lower layer of the sheet 6 and the infusion port 3. Further, on the surface of the sheet 6 sandwiched between the molds 8, the upper and lower mouth molds 8
The repulsive force accumulated at the time of pressurizing and sandwiching is gradually released due to the softening of the sheet 6, but the repulsive force acts in the outer diameter direction of the tube such as the infusion port 3 in the deep portion of the sheet 6 on the opposite side. Therefore, the softened sheet 6 and tube are successively driven into the groove 9 to form the protrusion 12.

A strong pressure is exerted by the sandwiching between the upper and lower portions immediately below the mouth molds 8, 8 in contact with the seat 6, and the heat generated in the groove portions 9 on both sides is transmitted, so that the pressure and heat generation should be controlled. This makes it possible to form an appropriate welded portion. As described above, transmission of heat from both sides and strong pressure by sandwiching between the upper and lower sides are utilized, so as shown in FIG. 9, the gaps between the protrusions 12 (bank-shaped welding marks) are completely sealed and strong welding is performed. The part 14 is formed. In FIG. 9, the inside of the rectangular frame is welded (primary weld portion 10). In order to form the two welded portions 14 as shown in FIG. 9, it is necessary to dispose three insulators 8b each having the groove 9 formed between the four electrodes 8a as shown in FIG. FIG. 10 shows a cross section of the primary welded portion 10 in this case.

As described above, the protector 4 is used in the first step.
And the infusion port 3 are welded together, and the infusion port 3 and the tubular member (the base portion 13 of the blood transfer tube 20) to which the protector 4 is welded in the second step are sandwiched between the two synthetic resin sheets 6 to apply a high frequency. Therefore, one sheet (sheet 6) and the tube (infusion port 3, strictly speaking, infusion port 3) are provided on one side of the tube (the base portion 13 of the blood transfer tube 20).
And the fact that one sheet (sheet 6) is simultaneously welded to one surface of the welded portion 10a) of the protector 4 is substantially the same. As a result, the high frequency is uniformly transmitted from the sheet 6 to the tubular member (the base portion 13 of the blood transfer tube 20) and the infusion port 3 (strictly speaking, the infusion port 3 and the welded portion 10a of the protector 4). It is possible to make the welding conditions of (the base portion 13 of the blood transfer tube 20) and the sheet 6, the infusion port 3 (strictly speaking, the infusion port 3 and the welded portion 10a of the protector 4) and the sheet 6 uniform.

Next, as shown in FIG. 11, the sheet 6 is pressed by upper and lower frame dies (not shown) to make a secondary welded portion 11.
And the bag-shaped main body 2 is formed. Finally the second welded part 1
The contour of 1 is press cut, and the medical bag 1 is separated from the sheet.

As described above, the infusion port 3 is formed by using the mouth die 8.
The method of manufacturing the medical bag 1 by welding the protector 4, the base of the infusion port 3 and the sheet 6 has been described.
The height H and the width W of the protrusion 12 (12a) are freely set by the thickness T of the tube (the infusion port 3, the base 13 of the blood transfer tube 20) and the sheet (the sheet 6, the sheet constituting the protector 4). be able to. As a result of various examinations, a tube (infusion port 3, base portion 13 of blood transfer tube 20)
Has an outer diameter R of 4 mm to 10 mm and a thickness T of the sheet (sheet 6, sheet constituting the protector 4) is 0.2 mm
To 0.5 mm, the height H of the projection 12 (12a) is preferably 0.05 mm to 1.0 mm, more preferably 0.1 mm to 0.3 mm.
It is preferable that the width W of the protrusion 12 (12a) is 0.
The thickness is preferably 2 mm to 10 mm, more preferably 1 mm to 3 mm.

Tube (infusion port 3, blood transfer tube 2)
The outer diameter R of the base portion 13) of 0 should be set from 4 mm to 10 mm.
This is because if it exceeds m, welding will be insufficient, which is not preferable. It is preferable to set T from 0.2 mm to 0.5 mm because if it is less than 0.2 mm, it is too thin to be welded to the tube, and if it exceeds 0.5 mm, it takes too much time for welding, which is not preferable. Is.

In the present invention, the height H of the protrusion 12 (12a) is preferably 0.05 mm to 1.0 mm.
This is because H has the same value as the step difference DS between the bottom portion B1 of the electrode 8a and the bottom portion B2 of the insulator 8b, and it is preferable to form DS from 0.05 mm to 1.0 mm for the following reason. Infusion port 3 covered with protector 4 (sheets 6, 6
12 and 2 (see FIG. 7) when applying a high frequency by pressing the infusion port 3) placed between the two with the upper and lower mouth molds 8, 8. )
As shown in Fig. 7, the sheet that contacts the linear electric field and the arc-shaped electric field generated between the ends P1 and P2 of the electrode 8a and comes into contact with the linear electric field (the electric field is dense) melts in a short time, but the arc-shaped sheet. The sheet that is in contact with the electric field (the electric field is sparse) is difficult to melt. The welding time can be controlled by utilizing the properties of these electric fields. Bottom B1 of electrode 8a and bottom B2 of insulator 8b
If the step DS is increased, the electric field becomes linear, so that the welding time becomes shorter, and if DS is decreased, the electric field becomes almost arcuate and the welding time becomes longer. This is because a moderate welding time of 2 to 3 seconds is required to firmly weld the tube and the sheet, and for that purpose, DS is preferably set to 0.05 mm to 1.0 mm.

In the present invention, the width W of the protrusion 12 (12a) is 0.2 mm to 10 mm, preferably 1 mm to 3 mm.
The width W is preferably the same as the distance DL between the electrodes 8a and 8a. The distance DL between the electrodes 8a and 8a is 0.2 mm to 10 mm, preferably 1 mm
The reason why it is preferable to form the film from 3 mm to 3 mm is as follows. D
If L is less than 0.2 mm, sparks are likely to occur,
If the DL exceeds 10 mm, it takes a long time until the constituent materials of the sheet and the tube are dissolved, which is not preferable.
In particular, when the sheet and tube are made of polyvinyl chloride resin, DL can be melted at about 150 ° C with 0.2 mm to 10 mm, but it is better to raise the temperature to about 150 ° C in about 2 seconds. Was repeatedly examined by the test, and as a result, it was preferable to set it to 1 mm to 3 mm.

In the present invention, the thickness t of the electrode 8a shown in FIG. 2 (FIG. 7) is preferably 0.3 mm to 1.0 mm.
The reason why it is preferable to form is as follows. Since the electrode 8a itself does not generate heat, in order to weld the sheet and the tube directly below the electrode, it is necessary to generate excess heat between the electrodes 8a and then directly below the electrode. If the thickness t of the electrode exceeds 1.0 mm, the area directly under the electrode 8a becomes large, so that excess heat generation is required. However, if the excess heat generation exceeds a certain amount, the welding surface becomes distorted or deformed, which is preferable. Absent. On the other hand, if the thickness t of the electrode is less than 0.3 mm, creeping discharge or discharge between electrodes occurs and normal operation cannot be performed, which is not preferable. Further, the smaller the area of the welding surface of the electrodes 8a, 8a arranged on both sides of the insulator 8b (the area immediately below the electrode to the object to be welded) (the smaller t), the smaller the area of welding with excess heat. Only that much can be surely welded.

[0019]

As described above, according to the present invention, the inside of the seat 6 is not rubbed as in the conventional case because the infusion port 3 is inserted from the upper side of the seat 6 when it is mounted. When a bank-shaped protrusion 12 is formed on the base portion 5 of the infusion port 3 and a plurality of protrusions 12 are formed, a strong welded portion 14 can be formed between these protrusions 12, so It is easier to adjust the welding strength than the method, and the strength of the medical bag can be improved. Compared to the conventional one in which the base 13 of the blood transfer tube 20 is directly welded and fixed to the upper portion of the bag-shaped main body 2 instead of the connection member of the tube to connect the blood transfer tube and the connection member using a solvent. Moreover, there is no concern that the tube and the inside of the bag-shaped body 2 come into contact with the solvent, which is hygienic. Moreover, since the number of parts is small, it is advantageous in terms of cost. The high frequency is applied from the sheet 6 to the tubular member (blood transfer tube 2
0) and the infusion port 3 (strictly speaking, the infusion port 3 and the welded portion 10a of the protector 4) are uniformly transmitted to the tubular member (the base 13 of the blood transfer tube 20) and the sheet 6, It is possible to make uniform the welding conditions of the liquid inlet 3 (strictly speaking, the liquid inlet 3 and the welded portion 10a of the protector 4) and the sheet 6.

[Brief description of drawings]

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

FIG. 2 is a schematic view showing a method for manufacturing the medical bag of FIG.

FIG. 3 is an enlarged view of a protector constituting the medical bag of FIG.

4 is a sectional view taken along line AA of FIG.

FIG. 5 is a schematic view showing a method for manufacturing the medical bag of FIG.

FIG. 6 is a schematic view showing a method for manufacturing the medical bag of FIG.

FIG. 7 is a schematic view showing a method for manufacturing the medical bag of FIG.

FIG. 8 is a schematic view showing the components of the medical bag welded together.

9 is a partially enlarged view of FIG. 8;

FIG. 10 is a sectional view taken along line BB of FIG. 8;

FIG. 11 is a schematic view showing a method for manufacturing a medical bag.

FIG. 12 is a partially enlarged perspective view around the electrodes of FIG. 2 (FIG. 7).

FIG. 13 is a schematic view showing a method for manufacturing a conventional medical bag.

FIG. 14 is a schematic view showing a method for manufacturing a conventional medical bag.

FIG. 15 is a schematic view showing a conventional method for manufacturing a medical bag.

[Description of sign]

 1 Medical Bag 2 Bag-shaped Main Body 3 Infusion Port 4 Protector 5 Base of Infusion Port 6 Sheet 7 Jig 8 Die 8a Electrode 8b Insulator 9 Groove 10a Welding Part 10 Primary Welding Part 11 Secondary Welding Part 12, 12a Protrusion 13 Base portion of blood transfer tube 14, 14a Strong welding portion 20 Blood transfer (blood collection, infusion) tube 21 Blood collection needle

Claims (3)

[Claims] 1. A method for producing a medical bag, which comprises the following steps. (1) By arranging an infusion port capped with a protector, an electrode having a pressing groove formed in the longitudinal direction of the infusion port, and an insulator having a groove portion formed in the lateral direction of the pressing groove between the electrodes. Step of pressing and welding with the upper and lower mouth molds configured, (2) Place the infusion port and the tubular member capped with the protector of (1) between two synthetic resin sheets from above. Then, the infusion port and the base of the tubular member and the sheet in contact therewith are formed with an electrode having a pressing groove formed in the longitudinal direction of the infusion port and the tubular member, and a groove is formed between the electrode in the lateral direction of the pressing groove. A step of pressing and welding with upper and lower mouth die configured by arranging an insulator,
(3) A step of pressing the sheet of (2) by upper and lower frame molds to form a bag-shaped main body, 2. The base of the infusion port, which is covered with a protector, is welded and fixed to the upper part of the bag-shaped body, and the height H is 0.05 to 1 mm and the width W is 0.2 to 10 m on the surface of the infusion port base.
A medical bag characterized by having a projection of m. 3. The medical bag according to claim 2, wherein the base of the blood transfer tube is welded and fixed to the upper portion of the bag-shaped main body.