A catheter and introducer needle assembly with needle shield that is connected to the needle hub by a pleated tether. The tether defines a plurality of holes therein to allow the introducer needle to extend through the tether. The tether prevents unwanted proximal movement of the needle with respect...http://www.google.es/patents/US6425884?utm_source=gb-gplus-sharePatente US6425884 - Compact needle shielding device
