Bags for medical use and intended in particular for parenteral nutrition

Claim 2

A bag for containing injectable products, comprising: first and second sides each formed from a pliable film sheet, each of said film sheets comprisig at least one layer of plastic material; a semi-rigid reinforcing frame formed from a plastic material, comprising side walls defining at least one central opening passing substantially perpendicular to a first plane passing perpendicular to the thickness of the frame and first and second flat faces surrounding said central opening, opposite each other with respect to said first plane; said first and second film sheets each being shaped in the form of a flat bottomed dish having a surrounding film part which serves as a rim for the dish; said surrounding film part of said first film sheet being fixed in a leak-proof manner to the first flat face of the frame and said surrounding film part of said second film sheet being fixed in a leak-proof manner to the second flat face of the frame; connecting tube means communicating the exterior of the bag with the interior thereof, said connecting tube means passing through one of the side walls of the frame; and the first and second film sheets being shaped and arranged so that when the bag is empty, said first and second sheets fit one in the other on the same side of said first plane so as to define between the two film sheets and within said opening of the frame a compartment having a volume which is variable and is practically zero when the bag is empty.

Claim 3

A bag according to claim 1, wherein said first and second film sheets are given their dished form by thermo-forming.

Claim 4

A bag according to claim 1, wherein said surrounding film parts are fixed to the faces of the frame by welding.

Claim 5

A bag according to claim 1, wherein said connecting tube means includes a terminal portion extending towards the outside of the frame.

Claim 6

A bag according to claim 1, wherein said frame is made in a single piece by injection moulding.

Claim 7

A bag according to claim 1, wherein the first and second film sheets each have at least one part extending beyond said side wall of the frame, said connecting tube means extends between said extending parts of the sheets and said extending part of the first and second film sheets are welded together at least at the edges thereof to define subsidiary protection means for the connecting tube means.

Claim 8

A bag according to claim 1, wherein said connecting tube means comprise at least two connecting tubes, one of which is permanently closed after the filling of the bag.

Claim 9

A bag according to claim 1, wherein said frame has first and second opposed ends and said first end includes means defining at least one opening for suspension of the bag.

Claim 10

A bag according to claim 1, wherein said frame has first and second opposed ends and said first end includes means for suspending the bag.

Claim 11

A bag according to claim 1, wherein each of said first and second film sheets is formed from a multi-layer film comprising at least one barrier layer impervious to atmospheric gases and moisture, sandwiched between at least two further layers of which at least that one situated towards the inside of the bag is made of a material compatible with the intended contents of the bag and does not contain noxious, toxic or plasticizer constituents which can be extracted by the intended contents.

Claim 12

A bag according to claim 10, wherein said barrier layer is polyvinylidene chloride.

Claim 13

A bag according to claim 10, wherein said further layers are both formed of polyethylene polyvinyl acetate.

Claim 14

A bag according to claim 10, wherein the combination of said barrier layer and said two further layers is itself sandwiched between two additional layers of plastic material.

Claim 15

A bag according to claim 13, wherein said additional layers are both of polyethylene.

Claim 16

A bag according to claim 10, wherein each multi-layer film comprises at least one thin metal layer.

Claim 17

A bag according to claim 15, wherein said metal is aluminum.

Claim 18

A bag according to claim 10, wherein said frame is made of the same plastic material as the contiguous layer of the multi-layer film with which its flat faces come into contact.

Claim 19

A bag for containing injectable products, comprising: first and second sides each formed from a pliable film sheet, each of said film sheets comprising at least one layer of plastic material; a semi-rigid reinforcing frame formed from a plastic material, comprising side walls defining a plurality of central openings passing substantially perpendicular to a first plane passing perpendicular to the thickness of the frame and first and second flat faces surrounding said central openings, opposite each other with respect to said first plane; said first and second film sheets each being shaped in the form of a flat bottomed dish having a surrounding film part which serves as a rim for the dish; said surrounding film part of said first film sheet being fixed in a leak proof manner to the first flat face of the frame and said surrounding film part of said second film sheet being fixed in a leak-proof manner to the second flat face of the frame; connecting tube means communicating the exterior of the bag with the interior thereof, said connecting tube means passing through one of the side walls of the frame; and the first and second film sheets being shaped and arranged so that when the bag is empty, said first and second sheets fit one in the other on the same side of said first plane so as to define between the two film sheets and said side walls, within said openings of the frame, a plurality of separate compartments having a volume which is variable and is practically zero when the bag is empty.

Claim 20

A bag for containing injectable products, comprising: first and second sides each formed from a pliable film sheet, each of said film sheets comprising at least one layer of plastic material; a semi-rigid reinforcing frame formed from a plastic material, comprising side walls defining a plurality of central openings passing substantially perpendicular to a first plane passing perpendicular to the thickness of the frame and first and second flat faces surrounding said central openings, opposite each other with respect to said first plane; said first and second film sheets each being shaped in the form of a flat bottomed dish having a surrounding film part which serves as a rim for the dish; said surrounding film part of said first film sheet being fixed in a leak proof manner to the first flat face of the frame and said surrounding film part of said second film sheet being fixed in a leak-proof manner to the second flat face of the frame; connecting tube means communicating the exterior of the bag with the interior thereof, said connecting tube means passing through one of the side walls of the frame; and the first and second film sheets being shaped and arranged so that when the bag is empty, said first and second sheets fit one in the other on the same side of said first plane so as to define between the two film sheets and said side walls, within said openings of the frame, a plurality of separate compartments having a volume which is variable and is practically zero when the bag is empty.