Measure 1: Negotiate with the other party, sign a patent rights agreement, pay some money, and then you can continue production and sales.
Measure 2: Stop selling. Those sold before the announcement date (January 25, 2012) will not be held accountable, but those sold after that will not be held accountable.
Measure 3: As mentioned above, find a way to invalidate the other party’s patent. For example, find evidence that it was already on the market before he applied, or the design picture was published in a magazine, etc. As long as it is public and there is evidence to show the time. But this also costs some money, at least hiring an attorney.
In short, it is probably impossible to do it without any expenditure.