Jan 31 (Reuters) - Medical device maker Boston Scientific beat Wall Street expectations for fourth-quarter profit on Wednesday, helped by strength in its heart devices unit.

On an adjusted basis, the company earned 55 cents per share in the quarter, compared with estimates of 51 cents, according to LSEG data. (Reporting by Christy Santhosh and Sneha S K in Bengaluru; Editing by Shounak Dasgupta)