Patent ID: 6254574
Filing Date: 2001-07-03
Classification: A61M

Abstract:
A self-blunting needle cannula device comprising:(a) an external component comprising a needle cannula having a through-bore, a tip comprising a puncture tip, a mounting end, and an external component hub on the needle cannula spaced from the tip;(b) an internal component comprising an elongate blunting member having a tip defining a blunt tip, and an internal component hub on the blunting member being disposed within the through-bore of the needle cannula;(c) wherein the external component and the internal component are movable relative to each other between a sharpened configuration in which the blunt tip is positioned short of the puncture tip of the needle cannula to leave the puncture tip exposed, and a blunting configuration in which the blunt tip extends beyond the puncture tip of the needle cannula to effectively blunt the device;(d) a guide surface on the device that leads axially towards the through-bore so that the guide surface can serve as a guide for the insertion of the blunting member into the through-bore during assembly of the device; anda detent and groove engagement between the external component and the internal component configured to inhibit movement from the blunting configuration to the sharpened configuration.