Boston Scientific (BSX) said late Monday its board authorized an additional $4 billion in share repurchases, raising the company's total buyback capacity to $5 billion.

Separately, the company said it expanded its board to 12 members and appointed Catherine Smith and Christophe Weber as directors.

Smith will serve on the Audit Committee and the Nominating and Governance Committee, while Weber will join the Executive Compensation and Human Resources Committee and the Risk, Science and Technology Committee, it added.