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Magnetic Resonance Conditional Microinjector.

Adam Wineland1, Yue Chen2, Brian Boland1

  • 1School of Electrical and Computer Engineering, University of Georgia, Athens, GA 30602, USA.

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|September 2, 2021
PubMed
Summary
This summary is machine-generated.

A new microinjector system allows researchers to study intraocular pressure (IOP) changes in real-time using MRI. This device is MR Conditional and accurately measures pressure during liquid injections, validating its use in glaucoma research.

Keywords:
MRIactuationblindnesseyeglaucomaimage guidedintraocular pressuremagnetic resonancemicroinjectorpneumatic

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Area of Science:

  • Biomedical Engineering
  • Ophthalmology
  • Medical Imaging

Background:

  • Glaucoma is a leading cause of blindness associated with elevated intraocular pressure (IOP).
  • Investigating the direct effects of IOP requires precise control over fluid dynamics within the eye.
  • Existing methods for studying IOP changes in vivo are limited, especially under Magnetic Resonance Imaging (MRI) guidance.

Purpose of the Study:

  • To develop and validate an MR Conditional microinjector system for real-time IOP investigation.
  • To assess the system's capability to inject small fluid volumes and measure resultant pressure changes.
  • To confirm the system's compatibility with a 3T MRI environment for research applications.

Main Methods:

  • A specialized microinjector system utilizing pressurized air and a linear actuator was designed.
  • The system was integrated with a pressure sensor for near-real-time IOP monitoring.
  • Feasibility was tested by injecting small water volumes into animal donor eyeballs and monitoring pressure and shape changes via MRI.

Main Results:

  • The microinjector system successfully injected precise fluid volumes, causing measurable increases in intraocular pressure.
  • MRI scans visualized the changes in eyeball volume and shape corresponding to pressure elevations.
  • The system demonstrated MR Conditional compatibility, operating without interfering with the 3T MRI scanner.

Conclusions:

  • The developed MR Conditional microinjector system is technically feasible for studying IOP effects.
  • This tool enables near-real-time investigation of ocular pressure dynamics under MRI guidance.
  • The system provides a novel method for advancing glaucoma research and understanding its mechanisms.