Fig. (4) a: Spheric PLGA micro particles loaded with Mibefradil(Canon Powershot G6 Digicam, 4x optical zoom). b: Capsule tensionring with fixed spheric PLGA micro particles loaded withMibefradil. The indicated area is seen in the next image below. c:Magnified view of the indicated area (in b) of the tension ring:scanning electron microscopic image of Mibefradil containingPLGA micro particles. d: Transmission electron microscopic image of Mibefradil containing PLGA micro particles.