Welsh, Carson, Anderson & Stowe (WCAS) has made a strategic investment in Constitution Surgery Alliance (CSA), according to a news release.

CSA, founded in 1998 and based in Avon, Connecticut, is a developer and operator of ambulatory surgery centers.

WCAS, founded in 1979 and based in New York, is a private equity firm focused on the healthcare and technology industries. The firm targets growth-oriented companies with an investment strategy that is deal-size agnostic.

Terms of the investment were not disclosed.