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Aurora Health Care answeredA Trifusion catheter is a long-term catheter used for drawing blood and giving intravenous fluids. This particular catheter is also suitable for the rapid withdrawal and return of blood, necessary for apheresis (the collecting of your cells). The tip of the catheter is in a large vessel near your heart. The other end will exit below your collarbone. The portion between is tunneled under your skin. The catheter is three tubes in one inside the body and separates into three tubes outside the body.