I had a morphine pump implanted about 3 years ago and will be glad to answer whatever questions I can for you. Whatever you still have questions on - please ask away. I know how big of a step this is to even consider. I haven't heard of infections being a big issue with pumps, but that doesn't mean it's not true.
I have DDD in 3 discs and after trying everything that was available to me and it failing and being told that further surgery was not an option, we needed to concentrate on a lifetime of pain control. My PM doc recommended doing a trial of the pump. That went well and we decided to go ahead with the pump. This trial period is about a week long and is a great thing to see how your husband will react to the morphine. They don't necessarily get the dosage where it needs to be, but enough that you can tell if there are any reactions.
I've had some success with the pump. It has brought the pain down when I do absolutely nothing. Most people get a much higher pain relief than I've been able to get, but with my back as bad as it is, I still have to take oral meds and am extremely limited in what I am able to do.
There are two types of pumps, so please make sure that your husband discusses the benefits of each with his doc. One works on hydrolics (kind I have) and the other by battery. The are filled differently and the dosages changed differently, so there is a big difference between the two.
Has the doctor shown you the actual pump so you and your hubby can get an idea of how it works and what it looks like? They implante the pump resevour in your front (one important thing is to discuss placement with your dr. - mine was very considerate of where he placed it and it's just under my ribcage) and there is a cathetar that goes around your side and connects to a port in the spine. Mine has to be refilled about every 60 days. They insert a special needle into the pump and remove the remaining morphine (there are no preservatives added so they have to drain it each time) and then refill it. It's not very painful, less than having blood drawn, as long as you have a good tech..
Hope this helps you out some and again, any questions, just post and I'll be happy to help whatever way I can.
Good luck to you and your hubby!:D