JP2000296176A - Medical heating bag and check valve structure for use therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical heating bag improved and devised so that thermal fusion or adhesion will not occur on the inner and outer surfaces of the heating bag, particularly in the region of a meandering passage formed therein and in a check valve portion during high-pressure steam sterilization and circulation of a heating liquid, and to provide a simple check valve structure for use therein. SOLUTION: In this medical heating bag comprising front and back synthetic- resin sheets 1, 1' bonded together by thermal fusion to form a meandering passage 2 for liquid between the sheets, each of the sheets 1, 1' is embossed with minute projections and recesses on at least the inner and outer surfaces of its portion forming the passage 2, and a check valve 7 is provided at the inlet 2A of the passage 2, the check valve 7 being formed of a connecting tube 4 inserted in and sealed to the inlet 2A of the passage 2 and sheet pieces made of a thermoplastic synthetic resin which are fitted over the inner end of the connecting tube 4 while taking approximately the form of a tube. The inner and outer surfaces of each sheet piece forming the check valve 7 are embossed with minute projections and recesses.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical heating bag used for supplying physiological saline for artificial dialysis and a check valve structure used for the same.

[0002]

2. Description of the Related Art Generally, medical heating bags of this kind are
At the time of use, it is used in a state where the outer peripheral surface is heated by a heater, and the temperature of the supplied liquid is maintained at about the body temperature. Prior to its use, it is placed in a sterilization container made of a synthetic resin bag and sterilized by high-pressure steam at approximately 120 ° C./20 minutes to 118 ° C./30 minutes.

However, since the medical heating bag itself is mainly formed by laminating a thermoplastic synthetic resin sheet having a relatively low melting point, such as vinyl chloride, by heat sealing, the sterilization bag for sterilization is not used. There is a risk that heat will cause thermal fusion at the interface between the vinyl chlorides. In particular, when the bag is folded and subjected to high-pressure steam sterilization, the outer surfaces of the bags or the outer surface of the bag and the outer surfaces of other parts are fused,
May be damaged when peeled off. Furthermore, when a medical heating bag is used, thermal fusion may occur in the distribution process of a heated liquid or the like, which may hinder the flow of the liquid and cause serious negligence in medical treatment. Such a situation must be completely excluded for medical safety management. Also,
When a check valve is provided at the liquid inlet of the medical heating bag and the check valve is formed of a substantially flat tubular sheet made of thermoplastic synthetic resin, it is necessary to consider a similar thermal effect. is there.

[0004]

SUMMARY OF THE INVENTION The present invention has been made based on the above circumstances, and an object of the present invention is to provide a heating bag inside a high-pressure steam sterilizer or a circulation of a heating liquid. An improved medical heating bag and a simplified heating device used therefor so that thermal fusion or adhesion does not occur on the outer surface, particularly in the area of the meandering passage formed therein and at the check valve. It is to provide a check valve structure of the type.

[0005]

For this reason, in the medical heating bag of the present invention, the synthetic resin sheets 1 and 1 ′ on the front and back sides are heat-sealed as clarified in the embodiment shown in the drawings. In the medical heating bag (10A or 10B) in which the liquid meandering passage 2 is formed between the two sheets, the sheets 1 and 1 'are attached to at least the passage 2
Embosses are formed on the inner and outer surfaces of the formed portion by fine irregularities, and the heat fusion is performed outside the passage region, and is thermally fused at least along the edge of the passage 2.

The emboss has a roughness such that the inner surfaces of the passage 2 do not fuse with each other. Further, when steam sterilization is performed on the medical heating bag, the outer surfaces of the medical heating bag and / or the outer surface of the medical warming bag are connected to each other. Roughness to the extent that it does not fuse with the surface of the other part, preferably, the roughness Ra of the inner surface is approximately 10
μm or more, and the roughness Ra of the outer surface is approximately 1.2 μm.
m or more.

[0007] The medical heating bag (10A or 10A)
A check valve 7 is provided at the inlet 2A of the passage 2 of B). The check valve 7 is connected to the connection tube 4 inserted and sealed at the inlet 2A of the passage 2 and to the inner end of the connection tube 4. It is formed by sheet pieces 8, 8 'made of thermoplastic synthetic resin which are packaged in a substantially tubular shape, and embossed by fine irregularities are formed on the inner and outer surfaces of the sheet pieces 8, 8' forming the check valve 7. It is characterized by:

The check valve 7 is provided so that both sides of the sheet pieces 8 and 8 ′ can be connected to each other at the time of the heat fusion at the time of forming the medical heating bag.
The two passages 2 are simultaneously heat-fused to both side edges, and are formed in a flat tube shape.

Further, the check valve 7 is provided on its inner and outer surfaces with
Sheets 8, 8 'made of thermoplastic synthetic resin having an emboss formed by fine irregularities are overlapped with one end of the sheet sandwiching the end of the connection tube 4, and formed into a tube shape by heat fusion.

Further, the embossments on the inner and outer surfaces of the sheet pieces 8 and 8 'constituting the check valve 7 are so rough that the inner surfaces of the lamination are not fused to each other, and the outer surface is the medical surface. The heating bag is formed so as to have such a roughness that it does not fuse to the inner surface, and preferably the inner surface and the outer surface have a roughness Ra of about 10 μm or more.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings. FIG.
And FIG. 2, respectively, selected by application,
Medical heating bags 10A, 10B of different meandering passage patterns and sizes are shown as front views. The passage 2 of the medical heating bag 10A of the first embodiment in FIG. 1 is formed to be longer than the passage 2 of the medical heating bag 10B of the second embodiment in FIG. 2, and other configurations and operations are substantially the same. It is. The description is common to the following.

In this embodiment, a front and back sheet 1 made of a thermoplastic synthetic resin such as vinyl chloride is used as usual.
1 ′ are bonded together by heat fusion to form a surface other than the heat fusion surface between the two sheets 1 and 1 ′ in a predetermined meandering passage 2 (see FIG. 3) and to communicate with the passage 2. , Its entrance 2A
And the connection tubes 3 and 4 are sealed to both ends of the outlet 2B. In particular, in the present invention, the check valve 7 is located at the inlet 2A of the passage 2 connected to the pump side,
Is provided. In addition, the sheets 1 and 1 ′ have inner and outer surfaces 1.
a and 1b are formed with embosses 5 by fine irregularities (FIG. 4 schematically shows an enlarged cross section),
When forming the heating bag, the heat fusion is performed outside the passage area 6.

The front and back sheets 1 and 1 ′ may be formed by polymerizing two sheets and heat-sealing them.
The heat-sealing may be performed by folding the sheets.
The inner and outer surfaces of the front and back sheets 1 and 1 ′ are embossed on the entire surface in the step before the above-mentioned heat fusion. The emboss 5 is formed only on the inner and outer surfaces.

As an embodiment of the present invention, even if the emboss 5 is subjected to high-pressure steam sterilization at a sterilization temperature, preferably at a temperature of about 120 ° C. for about 20 minutes, the outer surface of the emboss 5 is not subjected to high-pressure steam sterilization. In this case, the outer surfaces when the bag is folded or the roughness such that the outer surface of the bag does not fuse with other parts (not shown), and the inner surface of the passage 2 does not fuse with each other (by fusion). , In the passage 2 so that the opposing surface does not adhere to the passage 2 and hinder the flow).
That is, preferably, the inner surface has a roughness Ra of about 10 μm.
m or more, and the outer surface has a roughness Ra of about 1.2 μm.
The above is formed. The roughness Ra is an arithmetic average roughness represented by the following formula, and is a value obtained by summing and averaging the absolute values of the deviation Yi from the average line to the measurement curve. Ra = 1 / N · Σ Yi (i = 1 → N)

Further, in such a medical heating bag, the check valve attached to the medical heating bag is such that the check valve 7 is made of a relatively thin sheet of front and back sheets 8 made of a thermoplastic synthetic resin such as vinyl chloride. 8 ′ is formed in a tube shape by overlapping and heat-sealing with the end of the connection tube 4 sandwiched at one end thereof (see FIGS. 5A and 5B).
And embosses 9 are formed on the inner and outer surfaces 8a, 8b of the sheet pieces 8, 8 'by fine irregularities. Sheet piece 8,
In the case of 8 ', two sheet pieces may be superimposed and welded on both side edges, or one sheet piece may be folded and one side may be formed by welding. The inner and outer surfaces of the front and back sheet pieces 8 and 8 ′ are embossed on the entire surface in the step before the above-mentioned heat fusion as in the case of the sheets 1 and 1 ′. Almost disappeared by the heat fusion, and the emboss 9 is formed only on the inner and outer surfaces of the passage portion.

Also, a seat piece 8 constituting the check valve 7,
As in the case of the sheets 1 and 1 ', the embosses 9 on the inner and outer surfaces 8' are so rough that the inner surfaces of the laminations do not fuse to each other, and the outer surfaces are the passages 2 of the heating bags 10A and 10B. The inner surface and the outer surface are formed to have a roughness Ra of about 10 μm or more, so as not to be fused to the inner surface. Further, in this embodiment, both sides of the check valve 7 are heat-sealed to both sides of the passage 2 by heat-sealing of the sheets 1 and 1 'when the medical heating bag is formed. It is configured in a substantially flat cylindrical normal state with contact closed (see FIG. 6).

In such a configuration, when forming the heating bag, the two sheets 1, 1 'are heat-sealed outside the passage area 6 by press molding using a heated mold. Note that, in this embodiment, 6
Are limited to a region of a predetermined width along both side edges of the passage 2 and a region of a predetermined width around the periphery of the sheets 1, 1 '. At this time, the emboss 5 melts and disappears outside the passage area 6.
The embossment 5 remains on the opposing surface in the passage 2. Therefore, even when heat treatment such as high-pressure steam sterilization at about 120 ° C./20 minutes is performed, the opposing surfaces adhere to each other due to thermal effects. Thus, an accident that blocks the passage 2 can be avoided. In the case of high-pressure steam sterilization, a required number of heating bags are loaded into a synthetic resin sterilization container (not shown). In this case, since the embossment 5 is also formed on the outer surfaces of the sheets 1 and 1 ', thermal fusion and adhesion between the outer surfaces when the bag is folded or other parts or components do not occur. Can be taken out smoothly. Further, even at the medical site, even when the heated liquid is passed through, the inner surfaces of the passage 2 are not embossed 5.
As a result, there is no danger of thermal fusion and adhesion, and there is no accident that hinders distribution and medical safety is ensured.

In the medical heating bag, a portion other than the portion where the liquid supply passage 2 is formed and other than the heat-sealed portion when the medical heating bag is formed, an air vent hole 1 is provided.
Form one. The hole 11 may be a round hole or a pinhole formed on the heating bag 10A, or may be a slit formed on the heating bag 10B. By providing such holes 11, the non-fused portion of the bag does not rupture due to air expansion during high-pressure steam sterilization, and the product value is not lost due to accidents such as tearing. Further, there is an advantage that the emboss 5 is formed and remains in a portion other than the portion where the liquid supply passage 2 is formed.

The check valve 7 attached to the bag is also affected by the above-mentioned thermal effects. However, this is also due to the presence of the embossment 9 on the inner surface 8a and the outer surface 8b of the sheet pieces 8, 8 'constituting the check valve. Thereby, adhesion between the inner surfaces and adhesion between the outer surface and the inner surfaces of the sheets 1, 1 'can be avoided. For this reason,
It does not hinder the opening and closing operation as a check valve. Particularly, in this embodiment, when the sheets 1 and 1 'are heat-sealed, both sides of the check valve 7 are simultaneously heat-sealed to both sides of the passage 2, so that the position of the opening / closing opening is secured. At the same time, it is flattened in a normal state, and a sufficient function of the check valve structure can be achieved as it is.

By the way, the check valve 7 is used when the liquid flows.
As shown in FIG. 7, the pump is expanded by the supply pressure of the pump and is opened to introduce a chemical solution into the passage 2. However, when the pump is stopped, the pressure of the backflow liquid in the passage 2 is reduced. In response to this, a blockage occurs to prevent backflow. Thus, by providing the check valve 7 in the passage 2, the valve structure can be simplified by making it a simple tube.

[0021]

According to the present invention, as described in detail above, a sheet made of a thermoplastic synthetic resin is bonded by heat fusion to form a predetermined meandering passage between both sheets and communicate with the passage. As described above, in the medical warming bag sealing the connection tube, the connection tube is provided with a check valve located at the entrance of the passage, and the seat is provided on the inner and outer surfaces thereof. An emboss is formed by fine irregularities, and the heat fusion is performed outside the passage region. Therefore, even in the case of performing high-pressure steam sterilization, there is no possibility that the heating bag will be fused and adhered in the sterilization container, and thermally fused and adhered in the region of the meandering passage formed in the bag. As it does not happen, the function as a heating bag is secured,
Also, there is an excellent effect that medical safety at the time of liquid supply is ensured.

Further, in the medical heating bag, the check valve has a sheet piece having an embossment formed by fine irregularities on its inner and outer surfaces, with one end of the check tube sandwiching the end of the connection tube. It is formed into a tube shape by overlapping and heat fusion. Therefore, when the heating bag is formed and used, thermal effects can be avoided as described above, as well as being incorporated and used at the same time.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a front view showing a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view along the line AA.

FIG. 4 is a schematic enlarged view of a main part.

FIGS. 5A and 5B are perspective views showing states that constitute a check valve structure. FIGS.

FIG. 6 is a longitudinal sectional view taken along the line BB in FIGS. 1 and 2;

FIG. 7 is a longitudinal sectional view of the check valve in a state where the heating bag is used.

[Explanation of symbols]

 1, 1 'seat, 1a, 1b inner and outer surface 2 passage, 2A inlet, 2B outlet 3, 4, tube 5 embossed 6, outside passage area 7 check valve 8, 8' sheet piece, 8a, 8b inner and outer surface 9 embossed 10A, 10B Heating bag 11 holes

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H058 AA16 BB25 BB29 BB32 CA22 CC17 EE01 EE19 EE20 4C077 AA05 BB01 DD18 DD26 EE03 GG06 KK27 KK30 4F211 AA15 AD05 AD08 AD24 AG07 AG23 AG25 AH63 TA02 TC17 TN11 TH02

Claims (7)

[Claims] 1. A medical heating bag in which a sheet made of a thermoplastic synthetic resin is bonded by heat fusion to form a predetermined liquid supply passage between the two sheets, wherein the sheet has at least the passage forming passage. A medical warming bag, wherein embossing is formed on the inner and outer surfaces of the portion by fine irregularities, and the heat fusion is performed outside the passage region. 2. The medical warming bag according to claim 1, wherein the emboss has a roughness such that inner surfaces of the passage do not fuse with each other, and steam sterilizes the medical warming bag. Sometimes the outer surface of the medical heating bag or a roughness of such a degree that the outer surface does not fuse with the other surface, preferably the inner surface has a roughness Ra of about 10 μm or more, and the outer surface has a roughness Ra Is formed with a thickness of about 1.2 μm or more. 3. A medical warming bag in which a sheet made of a thermoplastic synthetic resin is bonded by heat fusion to form a predetermined liquid supply passage between the two sheets, wherein the sheet has at least the passage forming passage. The inner and outer surfaces of the portion are formed with embosses by fine irregularities, the heat fusion is performed outside the passage area, and a check valve is provided at the entrance of the passage, Is formed of a connection tube inserted and sealed at the entrance of the passage, and a thermoplastic synthetic resin sheet that is provided in a substantially tubular shape at the inner end portion of the connection tube,
A medical heating bag, characterized in that an embossed portion with fine irregularities is formed on inner and outer surfaces of a sheet forming the check valve. 4. The medical heating bag according to claim 3, wherein the check valve has both sides of the sheet piece on both sides of the passage at the time of the heat fusion at the time of forming the medical heating bag. A medical heating bag, which is formed in a flat tube shape that is heat-sealed to a tube. 5. The medical heating bag according to claim 1, 2, 3, or 4, wherein heat fusion is performed at a portion other than the liquid supply passage forming portion and when the medical heating bag is formed. A medical heating bag characterized in that a hole for air escape is formed in a part other than the part. 6. A check valve structure for use in a medical warming bag, wherein the check valve has a thermoplastic synthetic resin sheet piece having embosses formed by fine irregularities on its inner and outer surfaces. A check valve structure characterized in that the connection tubes are overlapped with the ends sandwiched therebetween and formed into a tube shape by heat fusion. 7. The check valve structure according to claim 6, wherein
The embossment on the inner and outer surfaces of the sheet piece constituting the check valve is as follows:
Roughness such that the inner surfaces of the bonding do not fuse together,
Further, the roughness is such that the outer surface does not fuse to the inner surface of the medical heating bag, and preferably, the roughness Ra of the inner surface and the outer surface is Ra.
Is formed to have a thickness of about 10 μm or more.