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Related Experiment Video

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Laser Activated Flow Regulator for Glaucoma Drainage Devices.

Jeffrey L Olson1, Raul Velez-Montoya1, Ramanath Bhandari2

  • 1Ophthalmology Department, University of Colorado School of Medicine, Rocky Mountain Lions Eye Institute, Aurora, CO, USA.

Translational Vision Science & Technology
|November 7, 2014
PubMed
Summary

A new glaucoma drainage device regulator offers titratable control of aqueous humor flow. Noninvasive laser adjustments allow precise regulation, improving surgical glaucoma treatment potential.

Keywords:
aqueous flowglaucoma drainage deviceintraocular pressuresurgical complications

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Surgical Devices

Background:

  • Glaucoma is a leading cause of irreversible blindness.
  • Current surgical treatments for glaucoma aim to reduce intraocular pressure by controlling aqueous humor outflow.
  • Existing glaucoma drainage devices may lack precise, adjustable flow control.

Purpose of the Study:

  • To evaluate a novel glaucoma drainage device regulator's ability to control fluid flow.
  • To demonstrate noninvasive, titratable adjustment of aqueous humor flow using the regulator.

Main Methods:

  • Utilized a rigid eye model and ex vivo porcine eyes to simulate ocular conditions.
  • Measured fluid flow and flow rate through a glaucoma shunt with and without the regulator.
  • Assessed regulator function by varying membrane opening (50%, 100%) and using laser shots for ex vivo titration.

Main Results:

  • The regulator significantly reduced flow compared to an open system (P < 0.05).
  • Laser-controlled adjustments showed a strong positive correlation (r=0.9) with flow control.
  • Flow rate increased with laser adjustments, remaining statistically lower than the un-regulated system (P < 0.05).

Conclusions:

  • The glaucoma drainage device regulator enables noninvasive, laser-mediated, titratable control of aqueous flow.
  • These findings support progression to in vivo animal studies, paving the way for improved surgical glaucoma therapies.