JPS63130336A - Manufacture of medical bag - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for welding a liquid distribution tube, an infusion port, a blood transfusion port, etc. to a medical bag.

(Prior art and its problems) Soft vinyl chloride blood bags are widely used for blood storage, component separation, etc.

As shown in FIG. 8, for example, this blood bag has a connecting tube 50 for connecting to another bag, a blood collection tube 51, a blood transfusion port 53 covered with a protector 52, etc. attached to the upper end of the bag.

In order to attach these parts, conventionally, as shown in FIG.
．． At the edge of 54.

The infusion port 53.53 and the spout 5 of each tube 50.51
A cylindrical body 58 such as 0a or 51a is inserted, and a core pin 55 for high frequency welding made of a conductive material as shown in FIG. Welding was carried out by pressing a high-frequency welding mold 57,57 in which a small straight pipe-shaped groove 56,56 was formed against a sheet 54,54. However, according to such a method, the melted cylinder body during welding The constituent material of the sheet is forcibly pushed out beyond the welded seal between the cylinder and the sheet, and protrudes into the interior space of the bag or protector as a water droplet-shaped burr 59, as shown in FIG. In particular, if a water droplet-shaped burr 59 forms on the inside of the bag, blood may remain in the narrow area formed by the burr, the opening area of each cylindrical body may become narrow, and blood flow may become poor, or blood cells may be damaged. This may cause problems such as causing On the other hand, the burr 59 on fl11 outside the bag had the risk of leading to bank failure of the protector 52.

Moreover, compared to the flexible thin sheet 54, the cylinder 58
has a thick wall and relatively high rigidity, so if you try to completely weld the sheet and cylinder while heating them, fusion will occur at the lower end of the cylinder as shown in Figure 12. There are also problems in that the received receipt becomes thinner, has a fragile portion 60, becomes easily damaged, and even has pinholes.

Such a phenomenon also occurs on the inner surface of the protector 52, and there is a risk that the fragile portion may be damaged and the blood transfusion port may be contaminated.

Furthermore, due to such a weak portion 60, the blood/<lug sheet had a tendency to bend inward from the welded seal portion, causing the two sheets to stick to each other. For this reason, blocking sometimes occurs during high-pressure steam sterilization, making it difficult to introduce blood into the interior.

Therefore, as shown in Japanese Patent Application No. 11to-172477, the applicant has straightened the sheet pressing portion 63, 63 and its cross section so that it fits within the shape of the mold 61 at the edge of the groove 62 of the mold 61. A method was proposed in which the sheet 65 and the tube 66 are clamped and welded using non-conductive portions 64 and 64' formed in the wafer (see FIG. 13). This method is an excellent invention that prevents the constituent materials of the tube 66 and the sheets 65 and 65 from flowing out beyond the sheet fusion sealing portion, thereby suppressing the occurrence of burrs on the inner surface of the medical bag.

However, (1) Clamping pressure is applied after welding, and the boundary between the welded area and the non-welded area tends to become irregular.

■Between the non-conductive parts 64 and the sheet suppressing parts 63 to 63,
Since the constituent materials are not welded, it is impossible to get closer than the sum of the thicknesses of the tube 66 and the sheet 65, and the sheet suppressing portion 67 of the mold 61
The resin between 67' and 67' was in a teriyaki state and bubbles were likely to be formed between the resins.

There was a problem in maintaining a perfect welded state due to (1).

(Means for Solving the Problems) Therefore, the present invention provides a plastic sheet between a mold equipped with a non-conductive part with a curved surface on the edge and a core pin with a stepped part formed by inserting a tube into the tip. The present invention provides a method for manufacturing a medical bag by sandwiching the bag, clamping it from a mold, and welding it by high frequency.

(Function) The constituent materials of the tube and sheet that are clamped and melted by the sheet suppressing part of the mold flow out in the vertical direction, and the flow of the constituent material that has reached the non-conductive part is controlled, thereby preventing the tube and sheet from flowing out. The welded parts are reinforced with thick walls.

(Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

Fig. 1 is a schematic diagram showing a method of manufacturing a medical bag;
3 and 3 are longitudinal sectional views showing the manufacturing process of the medical bag.

In the figure, 1.1 is a soft plastic sheet made of polyvinyl chloride, and 2 is a tube (hereinafter abbreviated as "tube") with a thin film 3 formed therein and used as a blood transfusion port.

4 is a core pin for inserting the tube 2, made of iron,
It is made of a conductive material such as stainless steel, brass, or duralumin, and has a step 9 formed at a position corresponding to the lower end of the tube 2 into which it is inserted. Reference numeral 5 denotes an air release hole, which creates an independent space A when the core pin 4 is inserted into the tube 2, and when the core pin 4 is inserted until its tip hits the thin film 3, the air in the space A is compressed. Since the phenomenon in which the core pin 4 is pushed back occurs, there are some devices formed to prevent this.

6.6 is a mold, and the sheet pressing portion 7.7 is formed straight.

Reference numeral 8 denotes a groove, and a groove 10 is formed at the tip thereof, that is, at a position corresponding to the lower end of the tube 2 and the upper end of the sealing part of the sheet 2, and a sheet pressing part 11 is formed in a curved shape. A non-conductive part 13.13 made of a conductive member is mounted and fixed. 14 is a screw for fixing the non-conductive part 13 to the mold. The tube 2 and the sheets 1' and 1 are welded together as follows.

Insert tube 2 onto the tip of core pin 4.

Place this between two sheets L and 1, and mold 6 from both sides.
, 6, and then a Takaoka wave is applied.

At this time, the portions of the tube 2 that were in close contact with the core pin 4 and the portions that were in close contact with the sheet suppressing portions 7.7 of the molds 6.6 of the sheets 1 and 1 melted quickly, and the portions that were in contact with the non-conductive portions 13.13. The heat is not transferred sufficiently and it becomes a semi-molten state.

As the clamping of the gold progresses, the molten constituent materials of the tube 2 and the sheet 1 lose their escape due to the protruding force received during clamping and move in the vertical direction.

The constituent materials of the tube 2 and the sheath 1 in contact with the non-conductive portion 13.13 are in a semi-molten state as heat is not directly transferred from the mold.

doesn't move much. Only the melted constituent material moves in the vertical direction when it comes into direct contact with the mold described above, but the non-conductive part 1
3. When the position of 13 is reached, the temperature decreases and the outflow rate also decreases rapidly.

Since the constituent material moving downward collides once with the first stage portion 9 and then flows out further, the constituent material that moves downward will actually flow beyond the lowermost end 15 of the sheet fusion seal portion to the fused sheet 1.
A regular thick reinforcing member 12 corresponding to the shape of the end 9 is formed on the inner circumferential surface of the opening 16 of the medical bag formed by the medical bag 1 .

The outflow speed of the component material moving upward is almost uniformly suppressed by the non-conductive portion 13, so that the component material moves upwardly.
and C) The welded part of 1 will be reinforced within the thickness.

The flow rate of the molten constituent material can be adjusted by appropriately changing the width X of the non-conductive part 13 attached to the mold 6.0 When the width When the width X is small, the amount of heat transferred to the constituent materials increases, so the amount of outflow increases. That is, if the width of the groove portion 8 is Y, then X/Y≧1.5
When , the constituent materials of the tube 2 and the sheet l do not flow out beyond the lowest end 15 of the sheet fusion seal, but when X/Y<, they flow beyond the lowest end 15 of the sheet fusion seal.

Further, since the sheet suppressing portion of the non-conductive portion 13.1-3 is formed in a curved shape, the sheet 1 bulges in an arc shape along the curved surface when clamped, and this shape remains even after the sheet is welded. maintained.

Strategy m Next, a second embodiment of the present invention will be described.

FIG. 4 shows that the sheet pressing portion 27 of the mold 26 is
The independent space 17 is discontinuous with the groove 28 formed in the center of the
A reference numeral 33 in FIG. 3 indicates a non-conductive portion in which a groove portion 30 and a curved sheet pressing portion 31 are formed.

As shown in FIG. 5, the tube 22 and the sheet 21.21 are welded between the core pin 24 and the mold 26.26 as in the first embodiment as follows.

The part of the tube 22 that is in close contact with the core pin 24 of the sheet 2
L, 21 mold 26.26 sheet suppressing part 27.27
The areas in close contact with the 33.3
3, the heat is not sufficiently transferred to the area where it came into contact, and the area is in a semi-molten state.

As the clamping between the molds 26 and 26 progresses, the melted constituent materials of the tube 22 and the sheet 21 begin to move due to the protruding force received during clamping, but some of the melted constituent materials enter the independent space during this process. 17 and is partially filled, the sudden protrusion is alleviated.

The constituent materials of the tube 22 and sheet 21 in the portions that are in contact with the non-conductive portions 33.33 hardly move, and even if they melt and start moving as described above, the outflow speed is delayed near the non-conductive portions 33.

Compared to the first embodiment, the amount of outflow of the constituent material moving in the vertical direction is reduced by the amount filled in the independent space 17, and the amount of outflow into the medical bag and between the upper sheet 21 and tube 22 is reduced by that amount. (The protector is attached to the sheet 21 and tube 22.)
If it is installed in between and welded, it will prevent it from leaking into the protector (inside the protector).

Therefore, when it is desired to prevent leakage into the medical bag and protector, the width of the non-conductive part 33 attached to the mold 26 and the width Y of the groove part 28 are adjusted by setting X/Y≧1.5. be able to.

When it is desired to form the reinforcing member 32, it is sufficient to adjust X/Y<1.5.

FIG. 7 is a sectional view of the welded portion of the tube and sheet of the medical bag formed according to this embodiment, and the welded sheet 2
1 are formed as ribs 37 on both sides of the tube and sheet constituent materials adsorbed and filled in the independent space 17, so uneven thickness and welding conditions can be clearly identified, and the strength of this area can be maintained, making it possible to The bag can sufficiently withstand centrifugal force during centrifugal separation when blood is stored in the bag and separated.

(Effects of the Invention) As described above, in the present invention, ■ The wall thickness of the mouth base of the medical bag is thickened, and a reinforcing member is formed along the inner circumferential surface of the mouth part, and the reinforcing member is , since it is formed in a fixed form corresponding to the shape of the end of the core pin, there is no possibility of weak parts or pinholes between the tube and the sheet, and problems such as blood retention due to blood staying in this rounded part are avoided. There is no danger arising.

■Sheet 1 is curved and swollen, so blood can be introduced smoothly without blocking during high-pressure steam sterilization, and blood can be drawn out smoothly along the curved surface. Since it is discharged, there is no residual blood or blood clots, making it easier to carry out the work.

It has excellent effects such as

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a method for manufacturing a medical bag according to the present invention, FIGS. 2 and 3 are longitudinal sectional views showing a first embodiment of the process for manufacturing a medical bag according to the present invention, and FIG. is a perspective view showing another embodiment of the mold used in the present invention,
5 and 6 are longitudinal sectional views showing a second embodiment of the process of manufacturing a medical bag according to the present invention, FIG. 7 is a sectional view taken along line AA in FIG. 6, and FIG. Plan view, No. 9.1
Figures 0111 and 12 are schematic diagrams showing a conventional method for manufacturing medical bags. In the figure, l, 21 is a sheet, 2.22 is a tube, 4.2
4 is a core pin, 6 and 26 are molds, 7.27 is a sheet suppressing part, 8.28 is a groove part, 9.29 is a step part, 10.30 is a groove part, 11.31 is a sheet pressing part, 12.32 is a Reinforcing member, 13.33 is a non-conductive part, 15.35 is the lowest end of the sheet fusion seal part, 16.36 is a mouth part, 17 is an independent space,
37 is a rib. Procedural amendment (method) February 28, 1985 Commissioner of the Patent Office Black 1) Akio Tono 1, Indication of the case 1985 Patent Application No. 276495 3, Person making the amendment Relationship to the case Patent applicant address (residence) ) February 24, 1988, 5, Amendment to the column 14 "Brief explanation of the drawings" in the specification of the present application Contents Page 14 of the specification of the present application, lines 9, 1 to 11 "...・Figure 9.10.11.12 t is a schematic diagram showing...'' is r...9.1O111,1
Figures 2 and 13 are schematic diagrams showing a conventional method of manufacturing a medical/clug. Correct it to 1.

Claims (1)

[Claims] A method for manufacturing a medical bag in which plastic sheets are stacked to form a bag shape, which includes a mold equipped with a non-conductive part having a curved edge and a tube inserted into the tip. A method for manufacturing a medical bag, which comprises sandwiching a plastic sheet between core pins having stepped portions, clamping them with a mold, and performing high-frequency welding.