The Gores Group on Wednesday said it has completed the acquisition of medical device maker Therakos Inc. from Johnson & Johnson’s Ortho-Clinical Diagnostics Inc.

Gores Group, the Westwood investment firm lead by billionaire financier Alec Gores, did not disclose terms of the deal, which was first announced in October. Therakos is a 25-year-old company based in Raritan, N.J. It makes a medical devices used to treat blood cancer in a process comparable to kidney dialysis, and also has developed systems used to treat immune diseases.

“Therakos is another vital step in Gores’ expansion into the healthcare industry and we are excited for this opportunity.” Edward Johnson, Gores managing director, said in a statement. The firm also owns Diagnostic Health Corp., a small Birmingham, Ala.-based chain of medical diagnostic imaging centers acquired in 2007.