June 11 (Reuters) - Medical device maker Stryker Corp has made a takeover approach to rival Boston Scientific Corp, the Wall Street Journal reported https://www.wsj.com/articles/stryker-has-made-a-takeover-approach-to-boston-scientific-1528727749?mod=searchresults&page=1&pos=1 on Monday, a combination that would give Stryker a strong position in stroke-preventing heart products.