Variable volume vessel having a rigid cover and a flexible part receivable into the cover

A vessel and a material stored therein, said material being in concentrated form such as freeze-dried material, said vessel permitting said material to be dissolved or diluted by a solvent injected into said vessel by a puncturing member prior to use, said vessel being adaptable for storing said material in an at least partly evacuated condition, and said vessel comprising:

• a flexible bag having a closed end and an opposite open end, the open bag end having a peripheral edge, said flexible bag defining an interior surface and an exterior surface;
• a rigid connection member having downwardly depending walls which form a cover, and having an upwardly directed opening and defining an interior surface and an exterior surface, the peripheral edge of the open end in the flexible bag being hermetically connected to the walls of the rigid connection member in such a manner that said interior surface of the flexible bag and said interior surface of the rigid connection member define a closed interior space;
• said opening in said connection member having a perforable, resilient, self-sealing membrane extending across the opening, through which membrane said interior space is accessible by such puncturing member, for adding such solvent to or removing the dissolved or diluted material from said interior space;
• and
• a protection member supported by the rigid connection member within said interior space adjacent said opening of the connection member, for preventing such puncturing member inserted through the connection member from contacting the flexible bag, the protection member having at least one opening therein in communication with said interior space;
• said concentrated material only taking up a small part of said interior space, said flexible bag being configured and dimensioned such that when at least partly evacuated, the flexible bag is, because of vacuum pressure, drawn up against said interior surface of the rigid cover and totally received therein and protected inside the walls of said rigid cover, and after adding the solvent into said interior space for dissolving or diluting said concentrated material, the flexible bag may expand in said rigid cover.

In combination, a vessel, and a material stored therein in concentrated form which is to be dissolved or diluted by a solvent prior to use, said vessel comprising:

• a flexible part having a closed end and an open end, said flexible part defining an interior surface and an exterior surface;
• a rigid part having side walls and an open end, and defining interior and exterior surfaces, the open end of the flexible part being tightly attached to the rigid part such that said interior surface of the flexible part and said interior surface of the rigid part define a closed interior space;
• a connection member on the open end of the rigid part, the connection member having an opening therethrough which communicates with said open end of said rigid part, and perforable membrane means extending across said opening, through which membrane means said interior space is accessible by a puncturing member for adding solvent to said material stored in said interior space or removing dissolved or diluted material from said interior space;
• and
• a protection member supported by said rigid part within said interior space adjacent said opening of the connection member, for receiving such puncturing member inserted through said opening and preventing such puncturing member from contacting the flexible part, the protection member having at least one opening therein in communication with said interior space;
• said concentrated material only taking up a small part of said interior space, said flexible part being configured and dimensioned such that when said interior space is at least partly evacuated, the flexible part is, because of vacuum pressure, drawn up against said interior surface of the rigid part, and after adding solvent into said interior space for dissolving or diluting said concentrated material, said flexible part may expand towards said open end of said rigid part.

A vessel and a material stored therein, said material being in concentrated form such as freeze-dried material, said vessel permitting said material to be dissolved or diluted by a solvent injected into said vessel by a puncturing member prior to use, said vessel being adaptable for storing said material in an at least partly evacuated condition, and said vessel comprising:

• a flexible bag having a closed end and an open end, said flexible bag defining an interior surface and an exterior surface;
• a rigid connection member and walls extending from said connection member which form a cover, and said connection member and walls having a common opening and defining an interior surface and an exterior surface, the open end of the flexible bag being hermetically connected to the walls such that said interior surface of the flexible bag and said interior surface of the walls define a closed interior space;
• said opening in said connection member having perforable membrane means extending across the opening, through which membrane means said interior space is accessible by such puncturing member, for adding such solvent to or removing the dissolved or diluted material from said interior space;
• and
• a protection member supported by the rigid connection member within said interior space adjacent said opening of the connection member, for preventing such puncturing member inserted through the connection member from contacting the flexible bag, the protection member having at least one opening therein in communication with said interior space;
• said concentrated material only taking up a small part of said interior space, said flexible bag being configured and dimensioned such that when at least partly evacuated, the flexible bag is, because of vacuum pressure, drawn up against said interior surface of the rigid cover and thereby protected inside the walls of said rigid cover, and after adding the solvent into said interior space for dissolving or diluting said concentrated material, the flexible bag may expand in said rigid cover.