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heparin lock. A device attached to an intravenous catheter to prevent it from clotting. It is used for intermittent administration of fluids or medication. See: heparin lock flush solution; venous access device.
Heparin and low-molecular-weight heparin. Elaine Gray1, Barbara Mulloy1, Trevor W. Barrowcliffe 1,2. 1National Institute for Biological Standards & Control, Potters Bar, UK; 2Current address: 3 Boulby Bank, Whitby, UK. Summary. Heparin is one of the oldest biological medicines, and has an es-.