Breathable structure and method for breathable structure formation

A breathable structure, which is adopted in a luer lock cap to be connected to a path of a medical tube body or in other housings, comprising:

• a breathable film;
• a base portion that is a housing portion in which the breathable film is provided;
• and
• an auxiliary film body assisting in connection between the breathable film and the base portion, wherein:
• the base portion is made of synthetic resin comprising a low melting point, comprising a through-hole to be covered with the breathable film;
• the breathable film comprises a two-layered film made of synthetic resin having breathability, in which a second film having a low melting point adheres to a porous first film having water repellency;
• the auxiliary film body comprises a two-layered film made of synthetic resin with an outer shape larger than an outer shape of the breathable film, in which a fourth film having a melting point higher than a melting point of a third film having a low melting point adheres to the third film;
• the breathable film is connected to the auxiliary film body with the second film being heat-laminated to the third film so that the breathable film does not extend beyond the auxiliary film body;
• and
• the auxiliary film body is connected to the base portion with an outer edge portion of the third film being heat-laminated to the base portion.

A method of forming a breathable structure, which is adopted in a luer lock cap to be connected to a path of a medical tube body or in other housings, the breathable structure comprising:

• a breathable film that is a two-layered film made of synthetic resin having breathability, in which a second film having a low melting point adheres to a porous first film having water repellency;
• a base portion made of synthetic resin having a low melting point, which is a housing portion comprising a through-hole to be covered with the breathable film;
• and
• an auxiliary film body that is a two-layered film made of synthetic resin, in which a fourth film having a melting point higher than a melting point of a third film having a low melting point adheres to the third film, and which assists in connection between the breathable film and the base portion and has an outer shape larger than an outer shape of the breathable film,
• the method comprising:
• placing the breathable film on the through-hole so that the first film side faces the through-hole, and further placing the auxiliary film body on the breathable film so that the fourth film side is directed upward and the breathable film does not extend beyond the auxiliary film body;
• and
• pressing heating means from outside of the housing to heat-laminate the second film to the third film and the third film to the base portion.

A method of forming a breathable structure, which is adopted in a luer lock cap to be connected to a path of a medical tube body or in other housings, the breathable structure comprising:

• a breathable film that is a two-layered film made of synthetic resin having breathability, in which a second film having a low melting point adheres to a porous first film having water repellency;
• a base portion made of synthetic resin having a low melting point, which is a housing portion comprising a through-hole to be covered with the breathable film;
• and
• an auxiliary film body that is a two-layered film made of synthetic resin, in which a fourth film having a melting point higher than a melting point of a third film having a low melting point adheres to the third film, and which assists in connection between the breathable film and the base portion and has an outer shape larger than an outer shape of the breathable film,
• the method comprising:
• placing a laminate, in which the second film of the breathable film adheres to the third film of the auxiliary film body so that the breathable film does not extend beyond the auxiliary film body, on the through-hole so that the first film side faces the through-hole;
• and
• pressing heating means from outside of the housing to heat-laminate the third film to the base portion.