A localization needle assembly includes an outer tubular cannula and a reinforced needle structure slidably mounted for movement within the outer cannula between extended and retracted portions, the needle structure includes a rearwardly extending retractable barb and a non-retractable barb which are...http://www.google.com.au/patents/US5127916?utm_source=gb-gplus-sharePatent US5127916 - Localization needle assembly
