Medical equipment maker Opto Circuits today said it has received approval from India's health regulator for a medical device for heart patients, following which it has launched the product in the market. Opto Eurocor Healthcare, a subsidiary of Opto Circuits (India), launched Sirolimus Drug Eluting Stent (DES), E-Magic Plus on receipt of Drug Controller General of India (DCGI) licence to sell and market the product in India, Opto Circuits said in a statement. A stent is a wire metal mesh tube that is used to open a blocked artery during an angioplasty.