An improved venipuncture device comprises a catheter having a catheter hub at one end with a needle having a needle hub at one end and a sharpened tip at the second end extending through the catheter and catheter hub. The needle is adapted for insertion and removal from the catheter. The improvement...http://www.google.es/patents/US4496348?utm_source=gb-gplus-sharePatente US4496348 - Venipuncture device
