Hi, my son had a pain pump installed a couple of years ago. I'm a Florida/Southern gal and don't know the size of a hockey puck! But, sounds the same. The doc implanted it in his back at his waist, for comfort and not to see. I can't see it at all, but don't think that should be a problem, as it helps him so much. Bending over would cause him a problem if it were in front. They'll put it where she thinks is best.It has to be changed out annually. And, the pain doc cks the amount/strength and adds what he needs at visits. It has changed his life! 18 years of horrible pain, no relief from all the opiods and heavy drugs. Now, with the pain pump, medical cannibis and a few other drugs, he's able to go out and get groceries, take care of himself and his condo and dog, live a better, if still horribly limited life and will some pain still. ANd, the most important treatment now is Botox shots every 3 months. Botox is a true life-saver!!!