What do you mean, exactly? A Google search shows all kinds of information about that patch. Most of them telling you it's a bad idea. Here's one site about how it works:
http://www.healthsquare.com/newrx/dur1637.htm
There are lots of lawsuits about the duralgesic patch causing overdose and death. I'd stay away.
I don't mean to sound like a smart*ss, but most people get prescriptions from their doctor. Is that what you were asking?
It sounds like you have a lot of pain, though, so I will try my best not to be a smart*ss. Traditional painkillers are very addictive -- most are narcotics, and that's opening the door to all kinds of new problems. Look at the topic discussions "my hydro addiction hell" and "Painkiller Addiction" on this web site. If you do end up going to a pain clinic, be very, very wary about what they put you on.
I would try everything else you can think of before going on a narcotic like the duralgesic patch,
fentanyl,
oxycontin,
hydrocodone,
morphine or any of the others. You might as well be shooting heroin.
I'd start with massage therapy, a respectable chiropractor (they do exist), water walking and other light exercise in a heated pool. There are also supplements you can buy at the grocery store that can actually repair cartilege damage instead of just masking the pain and turning you into a drugged-out zombie. A few are chondroitin, glucosamine, shark cartilege and sea cucumber extract. But repairing the damage takes time, so you will hurt.
Turmeric, cayenne and other natural spices and herbs are proven to be even more effective than NSAIDs like
Advil to reduce pain from inflammation, but they take a few days to build up in your system before they do any good. The good news is, they don't erode the cartilege your body is trying to repair, and NSAIDs will, making your condition worse over time. Get an appointment with a certified clinical nutritionist to find out more about the dietary approach to healing and pain relief specific to your particular problems. To do this, call your local college's nutrition department-head and ask for a referral, or call the local Diabetes Association office -- they probably have a list of people you can call.
Acupuncture and modified yoga can also be very effective in treating pain from injuries. The key is to be open to new things even if they sound weird, especially if they might just work. Desperate times call for desperate measures, right? Even steroids are a better choice than a narcotic.
I do hope you feel better.
Best of luck.
pain meds 
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