Figure 2.

The first-generation trabecular iStent (A) with the self-trephining tip that is inserted into Schlemm’s canal via a sideways sliding technique, and then is maintained by the retention arches. The lumen is the portion facing the anterior chamber. The second-generation trabecular iStent inject (B), with four side ports within the Schlemm’s canal. The central lumen faces the anterior chamber. This model eliminates the need for the sideways sliding movement in the surgery technique.

Note: Copyright © 2014. Dove Medical Press. Adapted from Hunter KS, Fjield T, Heitzmann H, Shandas R, Kahook MY. Characterization of micro-invasive trabecular bypass stents by ex vivo perfusion and computational flow modeling. Clin Ophthalmol. 2014;8:499–506.²³