Table 1

First and second generation minimally invasive ab-interno suprachoroidal stents

MIGS cyclodialysis device evolutionFirst generationFirst generationSecond generationSecond generation
Name CyPass iStent Supra MINIJect Biostent
MaterialSynthetic
Polyimide plastic
Synthetic Polyethersulfone and titaniumSynthetic
Porous silicon
Biotissue
Porous scleral allograft
Stented approachCyclodialysis tube Maintainer stentCyclodialysis tube Maintainer stentPorous cyclodialysis Maintainer stentPorous cyclodialysis Maintainer biostent
Implantation depth control (IDC)*NoneNoneNoneGoniometric
Implantation TechniqueIntraoperative gonioscopyIntraoperative gonioscopyIntraoperative gonioscopyIntraoperative gonioscopy or
gonio-free IDC†
Material permeabilityNon-permeable
Non-hydrophilic
Non-permeable
Non-hydrophilic
Porous, hydrophilic, permeablePorous, hydrophilic and permeable25
Structural rigidityRigid
Non-conforming
Rigid
Non-conforming
Semirigid
Semiconforming
Flexible
Conforming
Homologous stenting with endoscleral cleft reinforcementNoNoNoYes
  • Stent images are provided in figure 1.

  • *IDC for goniometric deployment.

  • †Grierson et al 30.