Stryker rises on deal to acquire Vertos Medical

** Shares of medical device maker Stryker SYK rise 1.1% to $348.86

** Co says it would acquire privately held Vertos Medical to expand its minimally invasive pain management portfolio

** Deal gives SYK access to Vertos' minimally invasive treatment for chronic lower back pain caused by lumbar spinal stenosis

** Lumbar spinal stenosis refers to a narrowing of the spinal canal in the lower back that may cause pain or numbness in the legs

** Financial details of the deal were not disclosed

** Including session's gains, stock up ~15% YTD