Patent ID: 7473239

Claim:
A system for mixing a fluid into a bloodstream of a body, comprising: a. a drainage cannula adapted to be inserted through both a superior vena cava of a heart of the body and an inferior vena cava of the heart, the drainage cannula having a first opening to receive blood from a superior vena cava blood flow and a second opening to receive blood from an inferior vena cava blood flow; b. an infusion cannula adapted to be inserted into the bloodstream downstream of both the superior vena cava and inferior vena cava; the drainage cannula and the infusion cannula being coupled as a single cannula assembly with at least two lumen, one lumen being the drainage cannula and the other lumen being the infusion cannula; c. a septum coupled between the lumen to fluidicly separate the lumen along at least a portion of a length of each lumen and adapted to flex between the two lumen to vary a cross-sectional flow area of at least one of the lumen; d. a pump coupled to the drainage cannula and the infusion cannula; e. a mixing unit coupled to the pump and adapted to mix the fluid into the bloodstream of the body; and f. an atraumatic introducer coupled to the cannula assembly and sized larger than a cross-sectional dimension of at least one of the lumen and adapted to pass through such lumen and cause the septum to flex toward another lumen to allow passage of the introducer.