JPH08155009A - Container for medical treatment - Google Patents

Abstract

PURPOSE: To improve the production efficiency of a container for medical treatment by sealing multilayer sheets of which the innermost layer is formed of a nylon material and the other layers consist of a material contg. a polymer blend composed of a block copolymer of a styrene, etc., and specific components, such as butadiene and resins, such as polyethylene, by high-frequency induction heating, thereby forming the container. CONSTITUTION: The innermost layer is formed of the nylon material. The block copolymer is formed of the part consisting essentially of at least one kind selected from a group consisting of styrene and a group consisting of ethylene and butadiene and isoprene and its hydrogen additive. The multilayer sheets are formed by using the material contg. the polymer blend composed of the copolymer and the resin consisting essentially of at least one kind selected from the group of the polyethylene, polypropylene and polybutene as the material for the other materials. The multilayer sheets are sealed 3 to each other or the multilayer sheets and the parts contg. the nylon material are sealed to each other by a high-frequency electrical heating method, by which the container is formed.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a medical container.
More specifically, the present invention relates to a bag for storing blood and blood components, a bag for storing body fluids such as bone marrow, lymph and urine, a bag for storing living cells such as bone marrow and lymphocytes, or an infusion bag.

[0002]

2. Description of the Related Art Medical containers include "blood bag" for storing blood and blood components, "cell culture bag" for storing living cells such as bone marrow and lymphocytes, "urine collection bag" for storing urine, An "infusion bag" that contains the drug solution for infusion,
Stores nutrients for direct administration to the central vein.
There are various types of bags such as "H bag" and bags for storing enteral nutrition. Among them, blood bags and infusion bags used to be glass containers in the old days, but they are characterized by being soft, light, unbreakable, and needing no aeration needle to take out the contents. With the advent of so-called soft bags, which are the containers that they carry, they rapidly changed to these. The soft bag forms the shape of the container by sealing a flexible plastic sheet or film. As a sealing method, in the case of a sheet made of soft polyvinyl chloride or an ethylene-vinyl acetate copolymer, a so-called high frequency dielectric heating method which utilizes internal heat generation of the sheet itself has been mainly used. In the case of a polyolefin sheet containing polyethylene, polypropylene, polybutene, polybutadiene or the like as a main component, or a portion containing at least one selected from the group consisting of styrene and ethylene as a main component,
Mainly comprises a copolymer composed of a moiety consisting of at least one selected from the group consisting of butadiene, isoprene and hydrogenated products thereof, and at least one selected from the group consisting of polyethylene, polypropylene and polybutene. In the case of a sheet made of a polymer blend with the components, it is practically impossible to seal by the high frequency dielectric heating method in which heat is generated from the inside of the sheet material, and heat that is the method of giving the heat necessary for sealing from the outer interface of the sheet The sealing method and impulse sealing method were used.

As described above, for medical containers such as various bags, a high frequency dielectric heat sealing method, a heat sealing method, an impulse sealing method, etc. are properly used depending on the type and shape of the material.

The high frequency dielectric heat seal method is a method in which molecules inside the sheet material are directly acted upon and heat is generated from the molecular motion, so that the interface between the sheets which needs to be melted releases less heat than other portions of the sheet. , The highest temperature. Therefore, it has advantages over the heat-sealing method and the impulse-sealing method in that the sealing strength is high, the sealing is beautifully finished, and the sealing time (the heat generation time and the cooling time) is short. On the other hand, there are drawbacks such as the need for shield equipment so that the electromagnetic waves generated by high-frequency oscillation do not leak outside, and the high-frequency oscillator is expensive.

In order to utilize the advantages of the high frequency dielectric heat sealing method, attempts have been made to obtain a required amount of heat by mixing a material that does not internally generate heat due to high frequency with a polymer material or a metal material that induces internal heat generation. For example, a method of polymer-blending an ethylene-vinyl acetate copolymer or polyvinyl acetate into polyethylene has been attempted, but a sufficient heating value can be obtained unless the weight content in terms of vinyl acetate unit is about 10% or more. Moreover, when the amounts were mixed, the molding temperature and the softening temperature of the material were too low, and it was unsuitable as a medical container. Also, a method of mixing metal powder such as iron powder into polyethylene has been attempted, but it is sufficient if the visible metal powder is dispersed in the sheet and part of it is exposed on the sheet surface. No calorific value can be obtained. Therefore, this method is also unsuitable as a sheet for medical containers. Furthermore, in order to seal material sheets that do not generate heat internally, such as a polyethylene sheet, a polyvinyl chloride sheet capable of high-frequency dielectric heating is inserted between the sheets and the high-frequency electrode, and high-frequency oscillation is performed to generate a high-frequency polyvinyl chloride sheet. Attempts have been made to conduct heat to the polyethylene sheet to seal it and then remove the unwanted polyvinyl chloride sheet. Although this uses a high-frequency oscillator, the sealing mechanism is an external heating method similar to heat sealing. For example, Japanese Examined Patent Publication No. 3-56890 discloses a method of attaching a port of a medical bag using the above method.

Since nylon is a material capable of high-frequency dielectric heating, a single layer sheet can generate a sufficient amount of heat generation and can perform good sealing, but in the case of a multi-layer sheet with a material that is not capable of high-frequency dielectric heating, In particular, in the case of a sheet having a nylon layer with a thickness of 50% or less, it was not possible to seal by a high frequency dielectric heating method by a usual method. Furthermore, when the nylon is polyether nylon, the amount of heat generated by the high frequency dielectric heating method is further reduced, and it is difficult to obtain the sealing strength required for medical containers. In these cases, there is no choice but to manufacture the medical container by the heat sealing method or the impulse sealing method. In addition, medical containers made of nylon single-layer sheets are not practical medical containers due to the high water vapor permeability of nylon, the inability to balance flexibility and strength, and the high material cost. It wasn't realized.

[0007]

The heat-sealing method and impulse-sealing method are methods for applying heat required for sealing from the outside of the sheet to the sealing surface through the sheet. Therefore, the heat required for melting the sheet interface required for sealing is used. There is a problem that it takes time to transfer energy, and it takes a cooling time after sealing, that is, there is a problem that production efficiency is poor. Further, there is a problem in that the material is restricted because the other parts of the sheet and the members to be fused must not be deformed to the extent that the shape cannot be maintained until the sheet interface is melted. That is, in the case of a multi-layer sheet, there is a restriction that a heat resistant material has to be arranged on the outer surface of the sheet rather than the material of the sealing surface. Further, although the deformation is not so large that the shape cannot be maintained, there is a problem in that the finish of the seal is not beautiful.

The object of the present invention is to solve the above-mentioned problems, and to improve the production efficiency of a multilayer sheet having nylon on the inner surface by a high frequency dielectric heating method to provide a beautifully sealed medical container. To do.

[0009]

The above problems can be solved by the present invention described below.

(1) A portion containing a nylon material as the innermost layer and containing at least one selected from the group consisting of styrene and ethylene as a main component, and a group consisting of butadiene, isoprene and hydrogenated products thereof. And a layer containing a material containing a polymer blend of a block copolymer composed of at least one part and a resin containing at least one selected from the group consisting of polyethylene, polypropylene and polybutene as a main component. A medical container characterized in that the multi-layered sheets or the parts containing the multi-layered sheet and the nylon material are sealed by a high frequency dielectric heating method.

(2) The medical container according to (1), wherein the innermost layer of the multilayer sheet has a thickness of 50% or less of the thickness of the multilayer sheet.

(3) The medical container according to (2), wherein the thickness of the innermost layer of the multilayer sheet is 20% or less of the thickness of the multilayer sheet.

(4) A portion of the polymer blend having at least one selected from the group consisting of styrene and ethylene as a main component, and at least one selected from the group consisting of butadiene, isoprene and hydrogenated products thereof. A block copolymer composed of
The composition ratio of the resin containing at least one selected from the group consisting of polyethylene, polypropylene and polybutene as a main component is 9: 1 to 1: 9 (weight ratio) (1) to (3) ) Medical container described in.

(5) The medical container according to any one of (1) to (4), wherein the nylon material is polyether nylon.

(6) The medical container according to any one of (1) to (5), wherein the sealing strength of the sealing portion of the medical container is 0.1 kgf / cm or more.

(7) The medical container is a bag for storing blood and blood components, a bag for storing body fluids such as bone marrow, lymph and urine, a bag for storing living cells such as bone marrow and lymphocytes, or an infusion bag. The medical container according to any one of (1) to (6), wherein

(8) The medical container according to (8), wherein the medical container is a bag containing blood and blood components.

The nylon material of the innermost layer of the present invention is nylon 46, nylon 6, nylon 66, nylon 61.
It may be a homopolymer such as 0, nylon 11, or nylon 12, or an alternating copolymer, or a copolymer or mixture of them. Further, the nylon material of the present invention may be a block copolymer composed of a polyether block and a nylon block, that is, so-called polyether nylon. For example, Leona of Asahi Kasei Corporation and UBE of Ube Industries
Nylon, Daicel Hurus's Daiamide, Dainippon Ink and Chemicals' Gru Relax, Toray's Toray Nylon, Pebax, Mitsubishi Kasei's Novamid, and Unitika's Unitika nylon.

A portion containing at least one selected from the group consisting of styrene and ethylene constituting the polymer blend of the present invention as a main component, and at least one selected from the group consisting of butadiene, isoprene and hydrogenated products thereof. The block copolymer composed of the seed portion is generally known as a styrene elastomer, a styrene butadiene rubber or a hydrogenated type thereof. More specifically, SBS,
SEBS, SIS, SEPS, EEBS, EEBE,
(SEB) n (however, S: polystyrene block, B:
Polybutadiene block, I: polyisoprene block, E: polyethylene block, EB: ethylene / butylene random copolymer block, EP: ethylene / propylene random copolymer block, SEB: styrene /
It means a block copolymer represented by ethylene / butylene copolymer). The production method thereof is not particularly limited, but a production method obtained by polymerizing butadiene or isoprene and then hydrogenating is also useful. These copolymers are, for example, Clayton, Kreton G, Califlex of Shell Chemistry, JSR-TR, JSR-SI of Japan Synthetic Rubber.
S, Dynaron, Mitsubishi Yuka's Ravalon, Aron Kasei's Aron AR, Kuraray's Septon, Sumitomo Chemical's Sumitomo TP
E and so on.

The polyethylene constituting the polymer blend of the present invention is preferably low density polyethylene (LDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE) and the like. Further, as the polypropylene, a homopolymer, a random copolymer, a block copolymer, or isotactic polypropylene, atactic polypropylene, syndiotactic polypropylene, or the like is preferable. Furthermore, polybutene is also preferably a homopolymer, a random copolymer, a block copolymer, or the like.

The polymer blend of the present invention comprises at least one selected from the group consisting of styrene and ethylene described above.
A block copolymer composed of a portion containing a seed as a main component, a portion containing at least one selected from the group consisting of butadiene, isoprene and hydrogenated products thereof, and the group consisting of the polyethylene, polypropylene and polybutene. The composition ratio of the resin containing at least one selected from the above as a main component is preferably 9: 1 to 1: 9 (weight ratio). When it is larger than 9: 1, the strength as a medical container is insufficient, and when it is smaller than 1: 9, the flexibility is insufficient, which is not preferable. The above-mentioned suitable composition ratio can provide a transparent and flexible medical bag.

The constituent material of the multilayer sheet of the present invention is not particularly limited except that the above-mentioned nylon material is arranged on the innermost surface of the medical container and the above-mentioned polymer blend material is arranged on the other layers. That is, a layer of another material may be provided between the two layers or outside the polymer blend described above. For example, it is preferable to provide an adhesive or an adhesive resin for adhering the two layers between the two layers. It is also preferable to provide a layer for protecting the sheet as the outermost layer.

The thickness of the innermost layer made of the nylon material of the present invention is preferably 50% or less of the thickness of the multilayer sheet. Furthermore, the thickness of nylon materials is 20% of the total
The following is more preferable. When the thickness of the nylon-based material is 50% or more of the total, the flexibility as a medical container is impaired and the material cost is increased, which is not preferable.

The thickness of the multilayer sheet used in the present invention is not particularly limited, but is preferably 0.05 mm or more and 2 mm or less. If the thickness is 0.05 mm or less, the strength of the medical container cannot be maintained. If it is 2 mm or more, there is a problem in flexibility.

The manufacturing process of the multilayer sheet of the present invention is not particularly limited. For example, dry lamination,
Wet lamination, coextrusion molding, or any other method may be used.

The high-frequency dielectric heat-sealing machine of the present invention may be of the same type as that used for sealing soft vinyl chloride or ethylene / vinyl acetate copolymer sheets. However, as a sealing condition, it is necessary to increase the capacitor capacity for achieving good matching with the oscillation time and increasing the current value.

The seal strength of the medical container of the present invention is 0.1.
It is preferably at least kgf / cm, more preferably 0.
It is 8 kgf / cm or more. This seal strength is a value that needs to be particularly noted in the case of a medical container in which an infusion solution or a chemical solution is put in for autoclave sterilization, or blood is put in and subjected to centrifugation. If the pressure is 0.1 kgf / cm or less, the seal portion may be peeled off when an infusion solution or a chemical solution is added for autoclave sterilization or when blood is added for centrifugation. The seal strength test method will be described with reference to FIG. The two sheets 1 and 2 are cut into a strip having a width of 2 cm in a direction perpendicular to the longitudinal direction of the seal 3. The sheet pieces 1 and 2 are chucked with a chuck distance of a tensile tester (eg, Autograph manufactured by Shimadzu or Strograph manufactured by Toyo Seiki Co., Ltd.) set to 20 mm, and a tensile speed of 200 mm / min. (23
The maximum value when the test piece is pulled until it breaks at
Divide by and convert to 1 cm width.

The medical container of the present invention is not particularly limited as long as it is used in the medical field. For example, it is a bag for storing blood and blood components, a bag for storing body fluids such as bone marrow, lymph, and urine, or an infusion bag.

[0029]

【Example】

Example 1 40.0 wt% of polypropylene EX-6 manufactured by Mitsubishi Petrochemical Co., 59.9 wt% of styrene-based elastomer manufactured by Shell Chemical Co., Inc., Kraton G1652, and 0.1 wt% of Irivanox 1010, an antioxidant of Ciba Geigy. %
Was mixed with a twin-screw extruder (PCM, manufactured by Ikegai Tekko KK), extruded into strands, and then cut with a pelletizer to obtain raw material pellets for the first layer. As a raw material for the second layer, an adhesive resin bondine TX-8030 manufactured by Sumitomo Chemical Co., Ltd. was prepared. As a raw material for the third layer, a nylon elastomer Pebax 4033SA manufactured by Toray Industries, Inc. was prepared. First
The raw materials for the layers and the third layer were coextruded at a die temperature of 230 ° C. so that the raw material for the second layer (not shown) was an intermediate layer and the raw material for the second layer (not shown) was an intermediate layer to obtain a multilayer sheet.

The total thickness of the multilayer sheet is 0.21 mm, and the thickness composition of the raw materials of the first layer, the second layer and the third layer is 75:10:
It was 15. A tube member shown in FIG. 2 was injection-molded at the molding temperature of 180 ° C. using the same raw material as the raw material for the third layer. High frequency dielectric heat sealing machine YF60 manufactured by Yamamoto Vinita Co., Ltd.
00A, high frequency output 6 kW, oscillation frequency 40.
46 Hz, press pressure 5 kgf / cm ² , oscillation time 3 seconds,
The bag was sealed in the bag shape shown in FIG. 2 under the condition that the cooling time was 2 seconds. The current value at that time was 0.28 to 0.40 A. The sheets and members were in a good melted state, and as a whole, they could be neatly sealed in a bag shape without burrs. The seal portion was cut into a width of 2 cm and the seal strength was obtained. Table 1 shows the results of seal strength, time, and aesthetics. 200 ml of bovine blood was placed in the bag and centrifuged at 3000 rpm for 10 minutes (hereinafter referred to as "centrifugation test"), but there was no problem such as leakage of blood. In addition, after putting 500 ml of physiological saline in the bag and closing the tube, 121 ° C-
Autoclave sterilization was performed for 20 minutes (hereinafter referred to as "autoclave resistance test"), but there was no problem such as leakage of internal solution.

(Example 2) Example 3 was repeated except that polyethylene LM-31 manufactured by Mitsubishi Petrochemical Co., Ltd. was used instead of polypropylene EX-6 manufactured by Mitsubishi Petrochemical Co., Ltd. in the raw material for the first layer of Example 1. Sheets and members were prepared in the same manner as in 1. The total thickness of the multilayer sheet is 0.24 mm, and the thickness composition ratio is 75:10:15.
Met. With the same device as in Example 1, high frequency output 6 kW,
Oscillation frequency 40.46Hz, press pressure 5kgf / c
Sealing was performed under the conditions of m ² , oscillation time of 3 seconds, and cooling time of 2 seconds. The current value at that time was 0.25 to 0.35A. The sheets and members were in a good melted state, and as a whole, they could be neatly sealed in a bag shape without burrs. The seal portion was cut into a width of 2 cm and the seal strength was obtained. Table 1 shows the results of seal strength, time, and aesthetics. A centrifuge test was conducted, but there was no problem such as leakage of blood content.

Example 3 Example 1 was repeated except that Dynalon E6100P manufactured by Nippon Synthetic Rubber Co., Ltd. was used in place of the styrene-based elastomer Craton G1652 manufactured by Shell Chemical Co. in the raw material for the first layer of Example 1. A sheet and members were prepared in the same manner as in. The total thickness of the multilayer sheet is 0.24 mm,
The thickness composition ratio was 40:10:50. With the same device as in Example 1, a high frequency output of 6 kW and an oscillation frequency of 40.46 H
Sealing was performed under the conditions of z, press pressure 5 kgf / cm ² , oscillation time 1 second, and cooling time 2 seconds. The current value at that time is 0.2
It was 9-0.41A. The sheets and members were in a good melted state, and as a whole, they could be neatly sealed in a bag shape without burrs. The seal portion was cut into a width of 2 cm and the seal strength was obtained. Table 1 shows the results of seal strength, time, and aesthetics. A centrifugation test and an autoclave resistance test were conducted, but there was no problem such as leakage of the content liquid.

Example 4 Kraton G1652, EX-6 and Irganox 10 in the raw material for the first layer of Example 1
The weight ratio of 10 is 89.9 wt%, 10.0 wt%, 0.
Sheets and members were prepared in the same manner as in Example 1 except that 1 wt% was used and Ube nylon 3035JU6 manufactured by Ube Industries, Ltd. was used instead of the nylon elastomer and Pebax 4033SA. The total thickness of the multilayer sheet is 0.50 m
m and the thickness composition ratio were 60:10:30. Example 1
High frequency output 6KW, oscillation frequency 40.4
Sealing was performed under the conditions of 6 Hz, pressing pressure 3 kgf / cm ² , oscillation time 3 seconds, and cooling time 3 seconds. The current value at that time was 0.25 to 0.35A. The sheets and members were in a good melted state, and as a whole, they could be neatly sealed in a bag shape without burrs. The seal portion was cut into a width of 2 cm and the seal strength was obtained. Table 1 shows the results of seal strength, time, and aesthetics.
Shown in A centrifugation test and an autoclave resistance test were conducted, but there was no problem such as leakage of the content liquid.

(Example 5) Kraton G1652, LM-31 and Irganox 1 in the raw material for the first layer of Example 2
The weight ratio of 010 is 10.0 wt%, 89.9 wt%,
A sheet and a member were prepared in the same manner as in Example 2 except that the content was 0.1 wt%. The total thickness of the multilayer sheet was 0.05 mm, and the thickness composition ratio was 40:10:50. With the same device as in Example 1, a high frequency output of 6 kW and an oscillation frequency of 40.46 H
Sealing was performed under the conditions of z, press pressure 2 kgf / cm ² , oscillation time 1 second, and cooling time 3 seconds. The current value at that time is 0.1
It was 5 to 0.25A. The sheets and members were in a good melted state, and as a whole, they could be neatly sealed in a bag shape without burrs. The seal portion was cut into a width of 2 cm and the seal strength was obtained. Table 1 shows the results of seal strength, time, and aesthetics. A centrifugation test was conducted, but there was no problem such as leakage of the content liquid.

(Comparative Example 1) The same sheets and members as in Example 1 were sealed in a bag shape using a heat sealing machine. Sealing conditions are mold temperature 260 ℃, sealing time 1
The working time was 5 seconds and the cooling time was 40 seconds, which was longer than that in Example 1. The finished appearance of the seal was not good because of the uneven melting of the surface of the member, and large burrs were generated under the condition of sealing without leakage. Width of seal is 2
It was cut out to cm and the seal strength was obtained. Table 1 shows the results of seal strength, time, and aesthetics. A centrifuge test and an autoclave resistance test were conducted, but there was no problem such as leakage of the internal solution.

(Comparative Example 2) The same sheets and members as in Example 2 were sealed in a bag shape using a heat sealing machine. Sealing conditions are mold temperature 230 ℃, sealing time 1
The working time was 2 seconds and the cooling time was 40 seconds, which was longer than that in Example 2. The finished appearance of the seal was not good because of the uneven melting of the surface of the member, and large burrs were generated under the condition of sealing without leakage. Width of seal is 2
It was cut out to cm and the seal strength was obtained. Table 1 shows the results of seal strength, time, and aesthetics. A centrifugation test was conducted, but there was no problem such as leakage of the internal solution.

(Comparative Example 3) The same sheets and members as in Example 3 were sealed in a bag shape using a heat sealing machine. Sealing conditions are mold temperature 260 ℃, sealing time 1
The working time was 8 seconds and the cooling time was 35 seconds, which was longer than that in Example 3. The finished appearance of the seal was not good because of the uneven melting of the surface of the member, and large burrs were generated under the condition of sealing without leakage. Width of seal is 2
It was cut out to cm and the seal strength was obtained. Table 1 shows the results of seal strength, time, and aesthetics. A centrifuge test and an autoclave resistance test were conducted, but there was no problem such as leakage of the internal solution.

(Comparative Example 4) The same sheets and members as in Example 4 were sealed in a bag shape using a heat sealing machine. Sealing conditions are mold temperature 260 ℃, sealing time 2
The working time was 0 seconds and the cooling time was 50 seconds, and the working time was extremely long as compared with Example 4. The finished appearance of the seal was not good because of the uneven melting of the surface of the member, and large burrs were generated under the condition of sealing without leakage. The seal portion was cut into a width of 2 cm and the seal strength was obtained. Table 1 shows the results of seal strength, time, and aesthetics. A centrifuge test and an autoclave resistance test were conducted, but there was no problem such as leakage of the internal solution.

Comparative Example 5 The same sheets and members as in Example 5 were sealed in a bag shape using a heat sealing machine. Sealing conditions are mold temperature 230 ℃, sealing time 5
Seconds, the cooling time was 23 seconds, and the working time was extremely long as compared with Example 5. The finished appearance of the seal was not good because of the uneven melting of the surface of the member, and large burrs were generated under the condition of sealing without leakage. The seal portion was cut into a width of 2 cm and the seal strength was obtained. Seal strength,
Table 1 shows the results of time and aesthetics. A centrifugation test was conducted, but there was no problem such as leakage of the internal solution.

[0040]

[Table 1]

[0041]

The medical container of the present invention has a high sealing strength by being sealed by the high frequency dielectric heating method, has a short heating and cooling time, that is, has a short sealing time, and has a good finished appearance of the seal. It can have an effect.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a seal strength test method.

FIG. 2 is a perspective view of what is sealed in a bag shape.

3 is a cross-sectional view taken along the line AA in FIG.

[Explanation of symbols]

 1, 2 sheet 3 seal part 4 tube member 5 first layer 6 third layer

Claims (8)

[Claims] 1. A portion containing a nylon material as the innermost layer and containing at least one selected from the group consisting of styrene and ethylene as a main component, and a group consisting of butadiene, isoprene, and hydrogenated products thereof. The other layer is made of a material containing a polymer blend of a block copolymer composed of a portion composed of at least one kind and a resin containing at least one kind selected from the group consisting of polyethylene, polypropylene and polybutene as a main component. A medical container characterized in that multi-layer sheets or parts including the multi-layer sheet and a nylon material are sealed by a high frequency dielectric heating method. 2. The medical container according to claim 1, wherein the thickness of the innermost layer of the multilayer sheet is 50% or less of the thickness of the multilayer sheet. 3. The medical container according to claim 2, wherein the thickness of the innermost layer of the multilayer sheet is 20% or less of the thickness of the multilayer sheet. 4. A portion containing at least one selected from the group consisting of styrene and ethylene of the polymer blend as a main component, and at least one selected from the group consisting of butadiene, isoprene, and hydrogenated products thereof. The composition ratio of the block copolymer composed of parts and the resin containing at least one selected from the group consisting of polyethylene, polypropylene and polybutene as a main component is 9: 1 to 1: 9 (weight ratio). The medical container according to any one of claims 1 to 3, which is characterized in that. 5. The medical container according to claim 1, wherein the nylon material is polyether nylon. 6. The medical container according to claim 1, wherein the sealing strength of the sealing portion of the medical container is 0.1 kgf / cm or more. 7. The medical container is a bag for storing blood and blood components, a bag for storing body fluids such as bone marrow, lymph and urine, a bag for storing living cells such as bone marrow and lymphocytes, or an infusion bag. It exists, The medical container of Claims 1-6 characterized by the above-mentioned. 8. The medical container according to claim 7, wherein the medical container is a bag containing blood and blood components.