The money issue was mentioned earlier, and I can see that happening....larger companies can cause smaller companies to close just becuase of the court costs, even if they don't have much of a case.I'm not a PA, however I work with ours very closely. IP is a very very complicated area. You really have to take a close look at EXACTLY what was said in the patent. If you write your patent well, you can push your IP out pretty far.
I can tell you it's not something you just want to assume you're ok on, if you have any info you might not be. Not only can you be sued to stop selling the item, but you can be sued for damages also here in the US.
I haven't read the patent so i have no opinion is the design is stepping on it or not. What i can say is if a company in general even thinks your stepping on it, they'll go after you. Especially in a case where they know they have more money than you. Many time patent battle come down to who is will to spend the most money.