Stryker Corp. is preparing to lay off area workers as it winds down the local operations it acquired from Gaymar Industries. Stryker has filed a notice with the state Department of Labor that it will lay off 11 area employees starting Sept. 21. A Stryker spokeswoman could not be reached to comment about the layoffs. The Michigan-based medical device maker acquired Gaymar in 2010 for $150 million and announced last December that it would close Gaymar’s operations in Orchard Park and West Seneca, which had 160 workers at the time. Stryker has previously said it would close the operations by the end of this year but had not specified when layoffs would begin.