Just did a quick search of "acute ischemic stroke rat" at PubMed, and it seems that middle cerebral artery occlusion MCAO is a standard method of induction: for example:http://www.ncbi.nlm.nih.gov/pubmed/20138164
Here's an overview of the models: you can see for yourself which ones are applicable to a large animal. Drug or device evaluation would not make a difference to the model for inducing a stroke, afaict from a glance these established models are all physical methods related to the obstruction of blood flow.
This is a nice review, I hadnt thought of looking on Wiki. There is one good paper referenced in the review from my perspective. You are correct that it makes no difference whether it is a large or small animal for inducing the stroke. However, testing a device on a small animal is of little value.