JP3561432B2 - Medical heating bag and check valve structure used therefor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention mainly relates to a medical heating bag used for supplying physiological saline for artificial dialysis and the like and a check valve structure used for the same.
[0002]
[Prior art]
Generally, this type of medical heating bag is used in a state where the outer peripheral surface is heated by a heater when used, and maintains the temperature of the supplied liquid 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.
[0003]
However, since the medical heating bag itself is mainly configured by laminating a thermoplastic synthetic resin sheet having a relatively low melting point, such as vinyl chloride, by heat fusion, the heat at the time of the sterilization, There is a risk of thermal fusion at the contact surfaces between 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 may be fused and damaged when peeled off. Furthermore, when the medical heating bag is used, thermal fusion may occur during the distribution of the heated liquid or the like, which may hinder the distribution of the liquid and cause serious negligence in medical treatment. Such a situation must be completely eliminated in medical safety management. Further, 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 cylindrical sheet piece made of a thermoplastic synthetic resin, a similar thermal effect is considered. There is a need.
[0004]
[Problems to be solved by the invention]
The present invention has been made based on the above circumstances, and its object is to form the inside and outside surfaces of a heating bag, particularly, at the time of high-pressure steam sterilization or at the time of circulation of a heating liquid. Provided is an improved medical heating bag and a simple check valve structure used for the same so that thermal fusion or adhesion does not occur in the area of the meandering passage and at the check valve. That is.
[0005]
[Means for Solving the Problems]
For this reason, in the medical heating bag of the present invention, the synthetic resin sheets 1 and 1 ′ on the front and back are bonded by heat fusion, and the liquid In the medical heating bag (10A or 10B) forming the meandering passage 2 of the present invention, the sheets 1, 1 'are formed by forming embosses with fine irregularities at least on the inner and outer surfaces of the passage 2 forming portion. The heat sealing is performed outside the passage area and is heat-sealed at least along the edge of the passage 2.
[0006]
The emboss has a roughness such that the inner surfaces of the passage 2 do not fuse with each other, and the outer surfaces of the medical heating bag or the outer surface and other portions when steam sterilization is performed on the medical heating bag. Is formed so that the surface does not fuse with each other, preferably, the inner surface has a roughness Ra of about 10 μm or more, and the outer surface has a roughness Ra of about 1.2 μm or more.
[0007]
A check valve 7 is provided at an inlet 2A of the passage 2 of the medical warming bag (10A or 10B), and the check valve 7 includes a connection tube 4 inserted and sealed at the inlet 2A of the passage 2; The connection tube 4 is formed of thermoplastic synthetic resin sheet pieces 8 and 8 ′ which are provided in a substantially tubular shape on the inner end portion thereof, and the check pieces 7 and 8 ′ forming the check valve 7 have fine inner and outer surfaces. It is characterized by forming an emboss by unevenness.
[0008]
The check valve 7 has both sides of the sheet pieces 8 and 8 'simultaneously heat-sealed to both side edges of the passage 2 at the time of the heat-sealing at the time of forming the medical heating bag, and has a flat tubular shape. Is configured.
[0009]
Further, the check valve 7 has, on its inner and outer surfaces, sheet sheets 8, 8 'made of thermoplastic synthetic resin having embosses formed by fine irregularities, with one end of the check tube 7 sandwiching the end of the connection tube 4 therebetween. It is formed into a tube shape by heat fusion.
[0010]
Further, the embossments on the inner and outer surfaces of the sheet pieces 8 and 8 ′ constituting the check valve 7 are rough enough that the inner surfaces of the bonded pieces are not fused to each other, and the outer surface is the medical heating bag. Is formed so as not to be fused to the inner surface thereof, preferably, the roughness Ra of the inner surface and the outer surface is about 10 μm or more.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings. FIGS. 1 and 2 show front views of medical heating bags 10A and 10B having different meandering passage patterns and sizes selected according to the application. The passage 2 of the medical heating bag 10A of the first embodiment of FIG. 1 is formed longer than the passage 2 of the medical heating bag 10B of the second embodiment of FIG. 2, and other configurations and operations are substantially the same. It is. A common description is given below.
[0012]
In this embodiment, the front and back sheets 1 and 1 ′ made of a thermoplastic synthetic resin such as vinyl chloride are bonded together by heat fusion as usual, and other than the heat-bonded surface between the two sheets 1 and 1 ′. A surface is formed in a predetermined meandering passage 2 (see FIG. 3), and connection tubes 3 and 4 are sealed at both ends of an inlet 2A and an outlet 2B so as to communicate with the passage 2. In particular, in the present invention, a check valve 7 is provided on one connection tube 4 located at the inlet 2A of the passage 2 connected to the pump side. Further, the sheets 1 and 1 'have embosses 5 formed by fine irregularities on their inner and outer surfaces 1a and 1b (FIG. 4 schematically shows an enlarged cross section). At the time of molding, the heat fusion is performed outside the passage area 6.
[0013]
The front and back sheets 1 and 1 'may be heat-sealed by polymerizing two sheets, or may be heat-sealed by folding one sheet. 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.
[0014]
Note that, as an embodiment of the present invention, the emboss 5 may be sterilized at a sterilization temperature, preferably at a temperature of about 120 degrees Celsius, for about 20 minutes, even if the outer surface is subjected to high-pressure steam sterilization. When the outer surfaces of the bag are folded, the outer surface of the bag or the outer surface of the bag is not so fused with other parts (not shown), and the inner surfaces of the passages 2 are not fused together (the fusion of the passages 2). In this case, the roughness is such that the opposing surface is not attached and the flow is not hindered. That is, preferably, the inner surface has a roughness Ra of about 10 μm or more, and the outer surface has a roughness Ra of about 1.2 μm or more. The roughness Ra is an arithmetic average roughness represented by the following equation, 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 / NΣYi (i = 1 → N)
[0015]
Further, in such a medical heating bag, the check valve structure attached to the medical heating bag is such that the check valve 7 includes front and back sheet pieces 8 and 8 ′ made of a relatively thin thermoplastic synthetic resin such as vinyl chloride. The connecting tube 4 is overlapped with one end thereof at one end thereof and formed into a tube shape by heat fusion (see FIGS. 5 (a) and 5 (b)). Then, embosses 9 are formed on the inner and outer surfaces 8a, 8b of the sheet pieces 8, 8 'by fine irregularities. The sheet pieces 8 and 8 'may be formed by polymerizing two sheet pieces and welding both side edges, or by folding one sheet piece and forming one side 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.
[0016]
Further, the embosses 9 on the inner and outer surfaces of the sheet pieces 8 and 8 'constituting the check valve 7 have a roughness such that the inner surfaces of the lamination do not fuse with each other, as in the case of the sheets 1 and 1'. The outer surface is formed so as to have such a roughness that the outer surface does not fuse to the inner surface of the passage 2 of the heating bags 10A and 10B, preferably, the inner surface and the outer surface have a roughness Ra of about 10 μm or more. Further, in this embodiment, both sides of the check valve 7 are heat-sealed on both sides of the passage 2 by heat-sealing of the sheets 1 and 1 'when the medical heating bag is formed, so that the inner surface 8a is It is configured in a substantially flat cylindrical normal state with contact closed (see FIG. 6).
[0017]
In such a configuration, when forming the heating bag, the two sheets 1 and 1 ′ are heat-sealed outside the passage region 6 by press molding using a heated mold. In this embodiment, the outside of the passage region 6 to be thermally fused is limited to a region having a predetermined width along both side edges of the passage 2 and a region having 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, but the emboss 5 remains on the opposing surface in the passage 2. Therefore, when used, high-pressure steam sterilization at about 120 ° C./20 minutes is used. Even if the heat treatment is performed, an accident that the opposing surfaces adhere to each other due to thermal influence and block the passage 2 can be avoided. During high-pressure steam sterilization, a required number of heating bags are loaded in a synthetic resin sterilization container (not shown). In this case, since the embossments 5 are 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. Furthermore, at the medical site, even when a heated liquid is passed, the inner surfaces of the passages 2 are not thermally fused or adhered to each other due to the function of the emboss 5, and there is no accident that hinders the distribution, and Safety is ensured.
[0018]
In addition, an air vent hole 11 is formed in a portion of the medical heating bag other than the liquid supply passage 2 forming portion and in a portion other than the heat fusion portion when the medical heating bag is formed. The hole 11 may be a round hole or a pinhole as formed in the heating bag 10A, or may be a slit as formed in 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.
[0019]
Further, the check valve 7 attached to the bag is also affected by the above-mentioned thermal influence. However, this is also caused by 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. Adhesion between each other and 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 the check valve. Particularly, in this embodiment, when the sheets 1, 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.
[0020]
By the way, the check valve 7 is expanded by the supply pressure of the pump when the liquid flows, and opens as shown in FIG. 7 to introduce a chemical solution into the passage 2, but the pump is stopped. In such a case, the pressure of the backflow liquid in the passage 2 is received on the outer surface, so that the backflow is blocked and the backflow is prevented. By providing the check valve 7 in the passage 2 in this way, the valve structure can be simplified by making it simple tubular.
[0021]
【The invention's effect】
The present invention has been described in detail above, and a thermoplastic synthetic resin sheet is bonded by heat fusion to form a predetermined meandering passage between both sheets, and a connection tube is connected to the passage. In the medical heating bag sealing the valve, the connection tube is provided with a check valve located at the entrance of the passage, and the sheet is embossed with fine irregularities on its inner and outer surfaces. And the heat fusion is performed outside the passage area.
Therefore, even when high-pressure steam sterilization is performed, there is no possibility that the heating bag will be fused and adhered in the sterilization container, and the region will be thermally fused and adhered in the area of the meandering passage formed in the bag. Since this does not occur, the function as a heating bag is ensured, and an excellent effect that the medical safety at the time of liquid supply is also ensured is achieved.
[0022]
Further, in the medical heating bag, the check valve, on the inner and outer surfaces thereof, a sheet piece on which embossing is formed by fine irregularities is overlapped with one end thereof sandwiching the end of the connection tube, It is formed into a tube by heat fusion.
Therefore, when forming and using the heating bag, the thermal effect 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 vertical sectional view taken along line AA.
FIG. 4 is a schematic enlarged view of a main part.
FIGS. 5A and 5B are perspective views showing a state forming a check valve structure in FIGS.
FIG. 6 is a vertical sectional view taken along the line BB in FIGS. 1 and 2;
FIG. 7 is a vertical sectional view of the check valve in a state where the heating bag is used.
[Explanation of symbols]
1, 1 'seat, 1a, 1b Inner / 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 / outer surface 9 embossed 10A, 10B Heating bag 11 holes

Claims (4)

In a medical heating bag in which a sheet made of a thermoplastic synthetic resin is bonded by heat fusion and a predetermined liquid supply passage is formed between the two sheets, the sheet is provided at least on the inner and outer surfaces of the passage forming portion. Forming an emboss by fine irregularities, the heat fusion is performed outside the passage area, a check valve is provided at the entrance of the passage, and the check valve is A connection tube inserted and sealed at the inlet, and a thermoplastic synthetic resin sheet formed in a substantially tubular shape at the inner end portion of the connection tube, and fine irregularities are formed on the inner and outer surfaces of the sheet forming the check valve. The embossment on the inner and outer surfaces of the sheet piece constituting the check valve has such a roughness that the inner surfaces of the lamination do not fuse with each other, and the outer surface is the inner surface of the medical heating bag. Coarse enough not to fuse to Medical warming bag, characterized in that it. 2. The medical heating bag according to claim 1 , wherein the check valve is heat-sealed on both sides of the sheet piece on both sides of the passage during the heat-sealing when forming the medical heating bag. 3. A medical heating bag, which is configured in a flat tube shape. The medical warming bag according to claim 1 or 2, in a portion other than the heat fusion portion during the formation of the liquid supply passage forming portion other than the portion at a by the medical warming bag, for deflation A medical heating bag having holes formed therein. In the structure of the check valve used for the medical heating bag, the check valve has a thermoplastic synthetic resin sheet piece on the inner and outer surfaces of which an emboss is formed by fine irregularities, and an end of the connection tube at one end. Laminated in a sandwiched state, formed into a tube shape by heat fusion, the embossment of the inner and outer surfaces of the sheet piece constituting the check valve is so rough that the inner surfaces of the lamination do not fuse with each other, A check valve structure having an outer surface having such a roughness that the outer surface does not fuse to the inner surface of the medical heating bag .

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