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US 5,968,620 AGranted
Blood collection tube assembly
AssigneeBecton, Dickinson and Company
InventorsNoel G. Harvey, Yelena G. Tropsha, Susan L. Burkett, Richard P. Clarke, Bryan Soo Wong
Life of this patent
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Abstract
The present invention is a plastic container coated with a multi-layer barrier coating. The multi-layer barrier coating is useful for providing an effective barrier against gas permeability in containers and for extending shelf-life of containers, especially plastic evacuated blood collection devices.
Claims6
A multi-layer barrier coating comprising:
- a first layer comprising an epoxide material;
- a second layer on said first layer comprising a metal oxide;
- and a third layer on said second layer comprising an organic material.
A method of depositing a multilayer barrier coating on a plastic substrate in a previously evacuated chamber comprising:
- (a) applying an uncured polyamine polyepoxide mixture onto said plastic substrate;
- (b) curing said mixture;
- (c) vaporizing an organosilicon component and admixing the volatilized organosilicon component with an oxidizer component and optionally an inert gas component to form a gas steam exterior to the chamber;
- (d) establishing a glow discharge plasma in the chamber from one or more of the gas stream components;
- (e) controllably flowing the gas stream into the plasma while confining at least a portion of the plasma therein;
- and
- (f) depositing a second layer of silicon oxide adjacent said first layer.
4 more elements
Dependencies are inferred from the claim text.