| abstract |
A multilayer vacuum tube for blood collection (10) comprising: a base wall (12), an upper edge (16) and a side wall (14) between the base wall (12) and the upper edge ( 16), comprising co-injected polymeric layers of inner and outer coating (56 and 54) and a polymeric core layer (52), where the core layer (52) is located between the polymeric layers of inner and outer coating ( 56 and 54) and directly adjacent to them, the polymeric coating flakes being incompatible with the polymeric core layer (52), where the inner and outer coating polymeric layers (56 and 56) encapsulate the core layer (52) and the upper edge (16) has a cross section of only the inner and outer skin layers (56 and 54) to physically prevent the core layer (52) from being delaminated from the inner and outer skin layers (56 and 54 ), where both for the entire base wall (12) and for t Around the side wall (14), substantially continuous coverage of a liquid vapor barrier material and a gas barrier material is provided up to 0.254 cm (0.1 inch) from the top edge (16), where the coverage substantially continuous indicates that a material is present in at least 98% of the cross section of the defined areas, and the cover layer is the gas barrier material and the core layer is the liquid vapor barrier material, or the cover layer is the liquid vapor barrier material and the core layer is the gas barrier material. |