Table 6.

Geometry and role of the materials used to build polymeric implants.

Materials	Design of the Device	Drug	Role of the Materials	References
EVA-PVA	Reservoir surrounded by a membrane	Glancicovir	EVA: membrane to limit the surface area for the permeability of the medication PVA: frame that regulates the rate of drug permeability	[8,9,14,15,16,17,18]
PVA-Silicone	Tablet geometry	FA	PVA: suture tab and coating Silicone: coating	[16,17,33,34,35,36,37,38,39]
PVA	Cylinder	FA	PVA: caps to regulate drug release rate	[40]
PVA-PMMA-Silicone	Ring	Avastin	PVA: polymeric carrier to control release and stability of the drug PMMA: reservoir material Silicone: check valves for refilling	[41]
Titanium-PVA-EVA	Helix	TA	Titanium-PVA-EVA: reservoir	[14,42]
PU-CNPs-PCL		DXM	PU: base material CNPs: as additive to modify mechanical properties PCL: as soft segment to improve polymer degradation, biocompatibility and stability	[57]
PI-PVA-Silicone	Tubular	-	PI: base material PVA: membrane Silicone: adhesive plug	[63]
PCL	-	TA, 5-FU, DXM	PCL: carrier	[80,81,82]
PLA	Disc	TA	PLA: base material	[92]
PLGA-HPMC	Rod	DXM	PLGA-HPMC: base material	[35,108,109,110]