I had one for a few weeks. I think the med in the pump was Ropivocaine???? I could not shower while I had it. I had to have my hair washed in the sink & could only take a bath in about an inch of water. The med they put in mine was horrible. It was supposed to numb my entire arm. Well........it just added a horrible tingling pain to the RSD pain. My doc couldnt understand why I didnt like it. We changed the dosages many times, but could not get it right. THe docs' hope was that if this worked he would put in a permanent pump. Let me know if you have any questions about it.