Patent ID: 8469941

Claim:
A method for minimizing backflow of a fluid substance administered by a catheter along at least a portion of an outer surface of the catheter, said catheter including an elongated portion having a plurality of undulations and at least one front or lateral opening for administering the fluid substance, the method comprising: inserting at least the elongated portion of the catheter into tissue of a patient, the tissue conforming to a contour of the outer surface of the catheter to define a reverse flow path along the outer surface in which the fluid substance may flow, wherein the reverse flow path between the outer surface of the inserted portion of the catheter and the tissue surrounding the inserted portion of the catheter is greater in length than a corresponding length of the inserted portion of the catheter; and administering the fluid substance through the catheter and into intercellular tissue space, wherein the elongated portion minimizes backflow of the administered fluid substance along the outer surface of the catheter.