Patent ID: 9283704
Filing Date: 2016-03-15
CPC Classification: A61B,B01L,B29C,B29L,Y10T

Claim Text:
1. A multilayer evacuated blood collection tube comprising: an open-ended tube structure having a top edge, the open-ended tube structure comprising an inner polymeric skin layer, an outer polymeric skin layer, and a polymeric core layer wherein the core layer is formed from a polymeric material selected from the group consisting of polypropylene and polyester, and the skin layers comprise a composite formed from polyester and montmorrillonite, said inner and outer polymeric skin layers and polymeric core layer being co-injected to form the tube structure free from fluid passageways located therebetween, wherein the core layer is non-compatible with the inner and outer skin layers and wherein the inner and outer polymeric skin layers encapsulate the core layer and the top edge has a cross-section of only the inner and outer skin layers to physically restrain the core layer from delamination from the inner and outer skin layers.