What is a pain pump?

Did you ever hear of a shoulder pain pump? Well I guess they have been used in my different surgeries however they are finding out that they are really not as safe as they seem to think they were. They were great until they found out that they were delivering to much medication and that it was destroying cartilage causing a condition called Postarthroscopic Glenohumeral Chondrolysis. Right now they are looking for people that have used these pumps for a lawsuit that is currently being conducted. It you or anyone you know has ever used one of these pumps please let them know they could get in on this law suit.