A blood vessel piercing instrument includes an outer tube assembly and an inner needle assembly. The outer tube assembly has an outer tube and an outer tube hub attached to the rear end portion of said outer tube. The outer tube has a metal tubular member made of a superelastic metal and a resin tubular...http://www.google.com/patents/US5522832?utm_source=gb-gplus-sharePatent US5522832 - Blood vessel piercing instrument
