Contemporary glaucoma drainage devices (GDDs)
| GDDs | Year of introduction | Tube diameter/material | Plate size/material | Resistance mechanism | ||||
|---|---|---|---|---|---|---|---|---|
| Molteno | 1979 | 0.63 mm OD | 135 mm2polypropylene | None | ||||
| 0.30 mm ID | ||||||||
| Silicone | ||||||||
| Baerveldt | 1990 | 0.63 mm OD | 200, 250, 350, 425, 500 mm2 silicone | None | ||||
| 0.30 mm ID | ||||||||
| Silicone | ||||||||
| Krupin with disc | 1990 | 0.58 mm OD | 180 mm2 silicone | Slit valve | ||||
| 0.38 mm ID | ||||||||
| Silicone | ||||||||
| Ahmed | 1993 | 0.63 mm OD | 185 mm2polypropylene with silicone valve | Venturi valve | ||||
| 0.30 mm ID | ||||||||
| Silicone | ||||||||
| Optimed Model-1014 | 1995 | 0.56 mm OD | 140 mm2 silicone with PMMA matrix | Microtubules | ||||
| 0.30 mm ID | ||||||||
| Silicone | ||||||||
OD = outside diameter.
ID = inside diameter.