Co-extruded tubing
AssigneeNatvar Holdings, Inc.
InventorsRobert James Donohue, George Coggins, III, Perry Benson
Life of this patent
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Abstract
A co-extruded tubing for the administration of intravenous fluids has an outer layer of a polyester. An inner fluid-contact layer may be of a polyethylene or of a thermoplastic polyurethane. Where the inner fluid-contact layer is of polyethylene, an intermediate tie layer of ethylene-vinyl acetate copolymer may be included to prevent delamination.
Claims16
A co-extruded tubing for the transfer of fluids, said tubing having at least two layers comprising:
- an outer layer, said outer layer comprising a polyester;
- and
- an inner fluid-contacting layer comprising:
- a thermoplastic polyurethane elastomer.
A co-extruded tubing for the transfer of fluids, said tubing having at least three layers comprising:
- an outer layer, said outer layer comprising a polyester;
- an inner fluid-contacting layer comprising a polyethylene;
- and
- an intermediate bonding layer between said outer layer and said inner fluid-contacting layer, said intermediate bonding layer comprising an ethylene-vinyl acetate copolymer.
A co-extruded tubing as claimed in clam 9 wherein said polyethylene is a linear high-density polyethylene.
A co-extruded tubing for the transfer of fluids, said tubing having at least two layers comprising:
- an outer layer, said outer layer comprising a polyester comprising a copolyester thermoplastic elastomer comprising a copolyester ether thermoplastic elastomer comprising a copolyester of alternating hard poly-1,4-butanediol terephthalate and soft long-chain polyalkylene ether therephthalate block copolymers connected by ester and ether linkages;
- and
- an inner fluid-contacting layer.
Dependencies are inferred from the claim text.