Tri-layer tubing
First Claim
1. A coextruded tri-layered medical-surgical tubing for the administration of common medicines such as insulin and nitroglycerin solutions, said tubing comprising an outer layer of polyvinyl chloride, a core layer of low-density polyethylene, and an intermediate layer of an ethylene-vinyl acetate copolymer interposed between said outer layer and said core layer.
27 Assignments
0 Petitions
Accused Products
Abstract
A coextruded tri-layered medical-surgical tubing for the administration of common medicines such as insulin and nitroglycerin solutions is disclosed. Improved flexibility and uniformity and increased peel strength are obtained by interposing a layer of an ethylene-vinyl acetate copolymer between an outer layer of polyvinyl chloride and a core layer of low-density polyethylene. The composite tubing exhibits excellent fluid flow characteristics and is readily employed in the transportation of intravenous fluids and the like without absorbtion or contamination difficulties.
-
Citations
5 Claims
- 1. A coextruded tri-layered medical-surgical tubing for the administration of common medicines such as insulin and nitroglycerin solutions, said tubing comprising an outer layer of polyvinyl chloride, a core layer of low-density polyethylene, and an intermediate layer of an ethylene-vinyl acetate copolymer interposed between said outer layer and said core layer.
-
5. A method of making tri-layered medical-surgical tubing for the administration of common medicines such as insulin and nitroglycerin solutions comprising simultaneously and coaxially extruding an outer layer of polyvinyl chloride containing a plasticizing amount of trioctyl trimellitate, a core layer of low-density polyethylene, and an intermediate layer of an ethylene-vinyl acetate copolymer in such a manner that upon extrusion said intermediate layer is intimately bonded to said outer layer and to said core layer.
Specification