Patent ID: 7156836

Claim:
A method of intravenous connection to a human subject, said method comprising the steps of: inserting and securing a flexible outer peripheral venous catheter in a vein; inserting a flexible first inner peripheral venous catheter which is thinner than said outer catheter into and through said outer catheter so that an intravenous connection takes place through the first inner catheter; selectively removing the first inner catheter from the outer catheter while the outer catheter remains in the vein; and inserting a flexible second inner peripheral venous catheter substantially identical to the first inner catheter into and through said outer catheter so that the intravenous connection takes place through the second inner catheter, wherein the first inner catheter is replaced with the second inner catheter from time to time when a lumen of the first inner catheter is clotted or to reduce the chance of an infection building up in said lumen.