WOW!, 6 lumens.. Is the patient that much of a sick puppy??? First of all, like you, I know that the more lumens means more manipulation, and an increase in CRBSI's. But, also remember that this is an ADD-ON device. According to INS, add on devices are a no-no, as this too causes an increase in infection. Filters, manual flow control devices (Dial-a-flows) or elongated tubing should be part of an integral set, and add on devices prohibited. Secondly, I too would be worried about compatibility issues. AND, last, but not least, the catheter you said that this patient has is known to HAVE THE HIGHEST INFECTION RATES OF ALL C-LINES. All of these things bring me to the need to evaluate the situation more closely...I am so glad that you are there to advocate for this patient.