To reduce internal friction within the valve system, the Ahmed™ Glaucoma Valve (AGV™) utilizes a specially designed, tapered trapezoidal chamber to create a Venturi effect to help aqueous flow through the device. As demonstrated by Bernoulli’s equation of hydrodynamic principle, the inlet velocity of aqueous entering the larger port of the Venturi chamber increases significantly as it exits the smaller outlet port of the tapered chamber. In an AGV™ this increased exit velocity greatly helps in evacuating aqueous from the valve, thereby helping to reduce valve friction.Non-Obstructive, Self-Regulating Mechanism:
The Ahmed™ Glaucoma Valve has no obstruction in its path of fluid flow. For the flow to be non-obstructive, a particle large enough to pass through the lumen of the tube, will easily pass through a much larger opening of the Venturi-Flow™ chamber. The elastic membranes help to regulate fluid flow at all times, consistently by changing their shape. The tension on these membranes is responsible for reducing hypotony.