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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 c

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.

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What is claimed is: 1. 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. 2. A co-extruded tubing as c

What is claimed is: 1. 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. 2. A co-extruded tubing as claimed in claim 1 wherein said polyester is a copolyester thermoplastic elastomer. 3. A co-extruded tubing as claimed in claim 2 wherein said polyester is a copolyester thermoplastic elastomer is a polyester ether thermoplastic elastomer. 4. A co-extruded tubing as claimed in claim 3 wherein said copolyester ether thermoplastic elastomer is a copolyester of alternating hard poly-1,4-butanediol terephthalate and soft long-chain polyalkylene ether terephthalate block copolymers connected by ester and ether linkages. 5. A co-extruded tubing as claimed in claim 1 wherein said outer layer has a thickness in a range from about 0.025 mm to about 0.152 mm. 6. A co-extruded tubing as claimed in claim 1 wherein said thermoplastic polyurethane elastomer is an aromatic polyether-based thermoplastic polyurethane elastomer. 7. A co-extruded tubing as claimed in claim 1 wherein said thermoplastic polyurethane elastomer is an aliphatic polyether-based thermoplastic polyurethane elastomer. 8. A co-extruded tubing as claimed in claim 1 wherein said inner fluid-contacting layer has a thickness in a range from about 0.025 mm to about 0.762 mm. 9. 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. 10. A co-extruded tubing as claimed in claim 9 wherein said polyester is a copolyester thermoplastic elastomer (TPE). 11. A co-extruded tubing as claimed in claim 10 wherein said copolyester thermoplastic elastomer is a copolyester ether thermoplastic elastomer. 12. A co-extruded tubing as claimed in claim 9 wherein said polyethylene is a branched low-density polyethylene. 13. A co-extruded tubing as claimed in clam 9 wherein said polyethylene is a linear high-density polyethylene. 14. A co-extruded tubing as claimed in claim 9 wherein said intermediate bonding layer is an ethylene-vinyl acetate copolymer having a vinyl acetate content of about 28%. 15. A co-extruded tubing as claimed in claim 9 wherein said intermediate bonding layer has a thickness in a range from about 0.025 mm to about 0.152 mm. 16. 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.