JP3142681B2 - Medical bag port welding mold, medical bag, and medical bag port welding method - 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 in which a port is welded to the upper end of a bag-shaped body, a mold for welding the port to the medical bag, and an improvement in a method of manufacturing the medical bag.

[0002]

2. Description of the Related Art At present, ports are welded to a medical bag by inserting a port 23 into an opening of a bag-like tube 24 (or sheet) as shown in FIG. As shown in FIG. 6 (a bottom view of the mold 21 shown in FIG. 5), the port welding mold 21 having the short groove 22 formed therein has an end corresponding to the liquid contact side of the port 23. (The inner side of the portion is formed in R), heat welding (primary welding), and then welding of the port 23 and the tube 24 by a heating mold (not shown) having a semicircular groove. The portion was held and welded by heating (secondary welding).

[0003] However, it is difficult to completely weld the port 23 to the tube 24 by the above means for the following reasons. When the port 23 and the tube 24 are pressed by the port welding mold 21, the pressing portions 26 of the upper and lower dies 21, 21 do not simultaneously reach the center line C of the port. In this case, a larger amount of heat is transmitted than expected, and the tube 24 in contact with the tube 24 is stretched and becomes extremely thin. Even if the upper and lower molds 2
Even if the pressing portions 26 of the first and second parts 21 arrive at the same time, the tube 24 in contact with the R part expands at the moment when the molds 21 and 21 are opened after the completion of the heating, and the tube 24 as shown in FIG. Is peeled off at the welded end portion, and a tunnel T which is a △ -shaped cavity is generated.

When the welding portion of the port 23 and the tube 24 is further sandwiched and heated and welded with the heating mold in a state where the tunnel T is formed, there is a possibility that breakage or pinholes may occur.

Since the groove 22 of the port welding mold 21 has a rectangular shape, the length provided around the port 23 varies.
Since the stresses applied to the upper half and the lower half of the port 23 were different, uniform welding could not be performed. Further, as shown in FIG. 8, the contact point of the port 23 of the R portion of the primary welding portion 27 and the contact point of the liquid contacting side of the port 23 of the secondary welding portion 28 are infinitely close to each other. If formed, there is a risk of breaking during secondary welding. Further, as shown in FIG. 9, when the thickness B2 of the central portion of the bag portion (tube) 24 is almost zero when the thickness B1 of the welded portion in the BB cross section is almost zero, there is a risk of leakage. In order to solve the above problems, the inventor of the present invention has to ensure that the upper and lower port welding dies always penetrate a constant circumferential length into the port, that no R portion is provided (or a small R portion), The following invention has been reached in consideration of the fact that the tube (or sheet) is tightly wound around the port so that the tunnel T cannot be formed.

[0006]

Means for Solving the Problems [1] The present invention provides (1)
Welding mold 2 and heating mold 3 arranged behind welding mold 2
(2) The welding mold 2 forms a heating half-peripheral surface 6 in the center and forms welding surfaces 4 on both sides of the heating half-peripheral surface 6. (3) The heating mold 3 heats in the center. A heating surface 5 is formed on both sides of the heating half surface 7 while forming the half surface 7. (4) The heating half surface 6 of the welding die 2 and the heating die 3
The diameter of the heating semi-peripheral surface 7 is made larger than the diameter of the port. (5) The welding surface 4 and the heating semi-peripheral surface 6 of the welding mold 2 are arranged.
Each of the heating surface 5 and the heating half-peripheral surface 7 of the heating mold 3 is coated with an insulating thin film. (6) The welding surface 4 of the welding mold 2 is applied to the heating mold 3. The present invention provides a port welding mold for a medical bag formed higher than the hot surface 5.

[2] The present invention provides a method for port welding a medical bag comprising the following steps. (1) A port is inserted into the upper end of the bag portion, and the port and the constituent members of the bag portion around the port are clamped and heated by the welding mold according to claim 1 to weld the constituent materials of the bag portions on both sides of the port. To form a primary weld and not welded to the primary weld
Step contacting circumferential constituent materials of the bag portion to the outer periphery of the port, the (2) the port and the primary welding portion is heated by holding the port welding die for the secondary weld, the port and the primary welding portion on both sides Continuous welding to form a secondary weld,

[3] The present invention relates to a medical bag in which a port is welded to the upper end of a bag portion, and both sides of the port are brought into circumferential contact with a primary welding portion formed by welding a constituent material of the bag portion.
First, the outer periphery of the port that is not in contact with the primary weld is welded.
Provided is a medical bag in which a secondary welding portion is formed which is circumferentially in contact with a bag-shaped constituent material that is not attached, and forms a continuous welded portion over the port and primary welded portions on both sides thereof.

[0009]

[Function] Since the material of the bag-shaped main body can be disposed almost uniformly around the outer periphery of the port, no wrinkles of the film or seal can be formed on the outer periphery, and the peripheral portion of the port is pressed with a secondary mold. Since the welding does not break through the Δ-shaped cavity during welding, no liquid leaks from the welded portion between the port and the bag-shaped body.

[0010]

FIG. 1 is a schematic view of a port welding mold 1 (hereinafter abbreviated as "welding mold 1") of a medical bag according to the present invention. The welding mold 1 is made of a conductive material such as brass or iron, and includes a rectangular welding mold 2 and a heating mold 3.

The welding mold 2 has a grooved heating half-peripheral surface 6 formed in the center, and flat welding surfaces 4 formed on both sides thereof. A heating mold 3 is provided behind the welding mold 2, and a groove-shaped heating semi-peripheral surface 7 is provided at the center of the heating mold 3.
Is formed continuously. Further, flat heating surfaces 5 are formed on both sides of the heating half circumferential surface 7.

Each of the surfaces 4, 5, 6, 7 is coated with a thin film made of an insulating material such as Teflon. The thickness of the thin film is 5 to 40 μm, preferably about 30 μm. This is to prevent the sheet from softening and blocking in the mold. The welding surface 4 is formed higher than the heating surface 5. The difference between the heights of these surfaces is preferably 0.1 mm to 1 mm. Further, the diameter of the groove-shaped heating semi-peripheral surfaces 6, 7 is formed larger than the diameter of the port of the medical bag. The reason for this is to adjust the pressure applied to the bag portion 10 and the port 11 as described later.

FIG. 2 is a diagram showing a use state of the welding mold 1. The bag portion 10 into which the port 11 is inserted is disposed between the upper and lower welding dies 1 and 1 and is sandwiched and heated by the upper and lower welding dies 1 and 1. The bag portion 10 pressed by the welding surface 4 is welded by receiving heat and pressure (primary welding portion), and the bag portion 10 and the port 11 pressed by the heating surface 5 and the heating semicircular peripheral surfaces 6 and 7 perform heating. receive. Since the welding surface 4 has the highest height from the bottom of the welding mold 1, a considerable portion of the bag portion 10 pressed against the welding surface 4 receives a strong pressure and is welded. Other heating surface 5 (the height from the welding die 1 bottom is lower than the soluble Chakumen 4) and the heating half-circumferential surface 6 bag portion 10 is pressed against the (larger than the diameter of port 11) and the port Since the pressure applied to the corresponding portion of No. 11 is dispersed, it is only heated and not welded.

Subsequently, the port 11 and the primary welding portion are
A secondary welding portion is formed by heat welding with a port welding mold (not shown) for secondary welding.

FIG. 3 is a schematic view of the medical bag 9 of the present invention formed as described above. The material of the bag portion 10 other than the corresponding portion of the bag portion 10 pressed by the welding surface 4 is melted. without the material of the bag portion 10 from the is only heated and softened is circumferential contact with the reliably periphery of port 11 without moving to wetted side of the port 11. The distance from the line A1 at the lower end of the primary welding portion 13 of the medical bag 9 to the line A2 at the lower end of the port 11 is 0 to 6 mm, and the distance from the line A2 to the line A3 at the lower end of the secondary welding portion 14 is 0 to 0 mm. It is formed to 10 mm. As shown in FIG. 4, when the thickness A4 of the central portion of the bag portion 10 is set to 100 by welding the port 11 to the bag portion 10 as described above, the thickness A5 of the AA cross section of the primary weld portion 13 is obtained. Can be maintained at 50 to 80. As a result, no leak occurs.

The welding die 1 of the present invention can be applied regardless of the port diameter, and the larger the port diameter, the smaller the length of the heating surface 5 to reduce the heating marks. -It is desirable that the diameter is 1.2 times to 2 times as large as the diameter.

[0017]

That is, the medical bag of the present invention does not have an R portion or a thin portion unlike the conventional medical bag, and the constituent material of the bag portion (the primary welding portion and the
Since the constituent materials) of the bag portion which is not welded can substantially uniformly circumferential tangent to <br/> Rukoto, is possible to prevent the port 11 and liquid leakage can be completely welded top end of the bag portion 10 it can.

[Brief description of the drawings]

FIG. 1 is a schematic view of a port welding mold.

FIG. 2 is a view showing a use state of FIG. 1;

FIG. 3 is a schematic view of a medical bag manufactured using the mold of FIG. 1;

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a schematic view showing a conventional port welding method for a medical bag.

FIG. 6 is a bottom view of the mold shown in FIG. 5;

FIG. 7 is a partially enlarged view of FIG. 5;

FIG. 8 is a schematic view of a conventional medical bag.

FIG. 9 is a sectional view taken along line BB of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Port welding mold 2 Welding mold 3 Heating mold 4 Welding surface 5 Heating surface 6 Heating half circumference 7 Heating half circumference 9 Medical bag 10 Bag part 11 Port 12 Bag welding part 13 Primary welding part 14 Secondary welding part

Claims (3)

(57) [Claims] 1. A welding mold 2 and a heating mold 3 arranged behind the welding mold 2. (2) The welding mold 2 forms a heating half-peripheral surface 6 at the center. At the same time, welding surfaces 4 are formed on both sides of the heating half-peripheral surface 6. (3) The heating mold 3 forms a heating half-peripheral surface 7 at the center and forms heating surfaces 5 on both sides of the heating half-peripheral surface 7. ) The heating half-peripheral surface 6 of the welding mold 2 and the heating mold 3
The diameter of the heating semi-peripheral surface 7 is made larger than the diameter of the port. (5) The welding surface 4 and the heating semi-peripheral surface 6 of the welding mold 2 are arranged.
Each of the heating surface 5 and the heating half-peripheral surface 7 of the heating mold 3 is coated with an insulating thin film. (6) The welding surface 4 of the welding mold 2 is applied to the heating mold 3. A port welding mold for a medical bag formed higher than the hot surface 5. 2. A method for welding a port of a medical bag, comprising the following steps: (1) A port is inserted into the upper end of the bag portion, and the port and the constituent members of the bag portion around the port are clamped and heated by the welding mold according to claim 1 to weld the constituent materials of the bag portions on both sides of the port. To form a primary weld and not welded to the primary weld
Step contacting circumferential constituent materials of the bag portion to the outer periphery of the port, the (2) the port and the primary welding portion is heated by holding the port welding die for the secondary weld, the port and the primary welding portion on both sides Continuous welding to form a secondary weld, 3. A medical bag in which a port is welded to an upper end of a bag, wherein both sides of the port are welded with a material constituting the bag.
The first welded portion is formed to be in circumferential contact with the first welded portion.
Bags that are not welded to the outer periphery of ports that are not in contact with
A medical bag characterized by forming a secondary welded portion that is circumferentially in contact with a material of a shape and is continuous over the port and primary welded portions on both sides of the port.