US 11,987,024 B2
Multilayer tubing having intermediate layer with additives
Fanqing Meng, Buffalo Grove, IL (US); and Marc William Weimer, South Jordan, UT (US)
Assigned to CAREFUSION 303, INC., San Diego, CA (US)
Filed by CareFusion 303, Inc., San Diego, CA (US)
Filed on Sep. 25, 2020, as Appl. No. 17/033,511.
Prior Publication US 2022/0099223 A1, Mar. 31, 2022
Int. Cl. B32B 27/08 (2006.01); A61L 29/04 (2006.01); A61L 29/14 (2006.01); A61M 5/14 (2006.01); A61M 25/00 (2006.01); A61M 25/01 (2006.01); B29C 48/09 (2019.01); B29C 48/21 (2019.01); F16L 11/12 (2006.01); B29K 105/00 (2006.01); B29L 23/00 (2006.01)
CPC B32B 27/08 (2013.01) [A61L 29/041 (2013.01); A61L 29/14 (2013.01); A61M 5/14 (2013.01); A61M 25/0009 (2013.01); A61M 25/0043 (2013.01); A61M 25/0108 (2013.01); B29C 48/09 (2019.02); B29C 48/21 (2019.02); F16L 11/12 (2013.01); B29K 2105/0005 (2013.01); B29K 2995/0055 (2013.01); B29L 2023/007 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A tubing comprising an inner layer, an outer layer concentrically disposed about and surrounding the inner layer, and an intermediate layer interposed between the inner and outer layers,
wherein the intermediate layer comprises a light protection additive included therein, the intermediate layer providing protection from light between 250 nm to 450 nm with a minimum of 90 percent blockage, and the inner layer and the outer layer being barriers to prevent migration of the light protection additive from the intermediate layer,
wherein the intermediate layer has a thickness less than the thickness of at least one of the inner and outer layers,
wherein the inner layer, the outer layer, and the intermediate layer are formed from a same base resin material,
wherein a hardness of each of the outer layer and the intermediate layer is at least 5 hardness units less than the hardness of the inner layer.