Rotablation involves breaking (plaque modification) of calcific plaques in hardened coronary arteries using a finely coated diamond burr. This diamond chipped burr is advanced over a guide wire into coronary artery and it revolves at a speed of 1,60,000 to 2,00,000 RPM. This facilitates advancing and properly deploying stents in calcified arteries (for prevention of complications like stent thrombosis and restenosis)