Tela Bio Inc. raised $16.2 million in a private stock, according to documents filed Thursday with the Securities & Exchange Commission. The Malvern, Pa., life science company is led by Antony Koblish, who was formerly CEO of Orthovita. Orthovita, a biomaterials developer also based in Malvern, was acquired last year by Stryker Corp. of Kalamazoo, Mich. for $340 million.