Yes, my Drs used OnQ pain buster. I had my surgery on Jan 25th. the On Q was no big deal at all. They just say it helps relieve pain. You take it out yourself at home on the 2nd day...or so many hours after surgery - didnt hurt at all either. Im not sure what the Cath is made of - but there is a little ball like thing that you can hang off your shirt. Just ask ur dr abut it - they will explain, but it turly is nothing to worry about. Who is your Dr??