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Related Experiment Video

Updated: May 2, 2026

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A new adjustable glaucoma drainage device.

Adan Villamarin1, Sylvain Roy, Stéphane Bigler

  • 1Laboratory of Hemodynamics and Cardiovascular Technology, Swiss Federal Institute of Technology, Lausanne, Switzerland.

Investigative Ophthalmology & Visual Science
|February 22, 2014
PubMed
Summary
This summary is machine-generated.

This study tested a new adjustable glaucoma drainage device (AGDD) that noninvasively controls outflow resistance to customize intraocular pressure (IOP) management.

Keywords:
adjustable glaucomadrainage devicefiltering surgeryglaucomashunt tube

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Devices

Background:

  • Glaucoma management requires precise control of intraocular pressure (IOP).
  • Existing glaucoma drainage devices may lack adjustability for personalized postoperative care.
  • Newer devices aim to offer customizable IOP modulation.

Purpose of the Study:

  • To evaluate a novel experimental noninvasively adjustable glaucoma drainage device (AGDD).
  • To assess the AGDD's ability to modulate outflow resistance and intraocular pressure (IOP).
  • To determine the feasibility of customized IOP management using the AGDD.

Main Methods:

  • Ex vivo testing of six AGDDs using a pressure transducer and perfusion system.
  • Experiments conducted on enucleated rabbit eyes to simulate glaucoma conditions.
  • Sequential adjustment of the AGDD disk position to measure IOP and flow rate.

Main Results:

  • The AGDD demonstrated a nonlinear relationship between pressure drop and disk position.
  • A functional adjustment range of 80° to 130° allowed for reproducible IOP modulation.
  • The device could be set to fully closed (above 130°) or open (below 80°) states.

Conclusions:

  • The experimental AGDD allows for adjustable outflow resistance to maintain physiological IOP.
  • This device may help mitigate hypotony risks in early postoperative stages.
  • The AGDD offers potential for achieving optimal IOP across various postoperative scenarios.