589233 A septum (114) to control blood flow through an intravenous catheter (110) is disclosed. The septum includes a substantially resilient helical outer shell (116) and an inner valve portion (118). The inner valve (118) is configured to be closed in an uncompressed state of the outer shell and open upon compressing the helical outer shell (116). The septum (114) may be disposed within a catheter adapter to be compressed upon connection with a luer device.
