Shares of some top medical devices companies are mixed at 10 a.m.:

Allergan rose $.09 or .1 percent, to $164.47.

Baxter International Inc. fell $.09 or .1 percent, to $76.67.

Boston Scientific Corp. rose $.07 or .5 percent, to $12.92.

Johnson & Johnson fell $.65 or .6 percent, to $102.63.

Medtronic fell $.51 or .8 percent, to $63.05.

St. Jude Medical Inc. fell $.33 or .5 percent, to $67.95.

Stryker unchanged at $82.74.

Zimmer Holdings Inc. rose $.13 or .1 percent, to $102.87.