and fluid flow is set at 50 ml h the solution contains a blue dye to visualize the fluid flow pattern as demonstrated solution initially travels in the downward direction and upon encountering the wall of the container proceeds to spread across the bottom and rise up uniformly this diversion of momentum of fluid flow concept can be incorporated into the apparatus of the invention to achieve even flow of polymer to the slit surface core sheath fibers were manufactured using an apparatus according to the embodiment of fig1 and 2 the apparatus consists of an inner trough with a slit width of 0 5 mm while the width of the outer trough is 2 mm the length of the entire slit is 7 cm these wedge shaped slits were affixed to a base fixture that allowed polymer solution to be directly delivered from inlet ports originating from the underside of the fixture a sheath solution 260 of 2 8 wt 85 15 plga in 6 1 by vol chloroform methanol and a core solution 230 of 2 8 wt 85 15 plga in 6 1 by vol chloroform methanol containing 30 wt dexamethasone drug with respect to plga was used the sheath flow rate was set at 100 ml h while the core flow rate was set at 50 ml h a voltage of 50 kv was applied core sheath fibers were manufactured using an apparatus according to the embodiment of fig1 2 and 6 the apparatus consists of an inner trough capable of holding 50 mls of polymer solution and outer troughs capable.