Is it ensure, insure, or assure?
angioplasty an·gi·o·plas·ty (ān'jē-ə-plās'tē)
Surgical reconstruction of a blood vessel.
A surgical technique in which a catheter containing a small balloon is inserted into arteries around the heart. The balloon is inflated to compress deposits of fatty substances blocking the artery, thereby restoring the flow of blood.
Note: Also called balloon therapy.