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FLUIDIC PERFORMANCE OF A DUAL-ACTION VITRECTOMY PROBE COMPARED WITH A SINGLE-ACTION PROBE.

David H Steel1, Martin Charles2, Ying Zhu3

  • 1Sunderland Eye Infirmary, Sunderland, United Kingdom and Bioscience Institute, Newcastle University, Newcastle Upon Tyne, United Kingdom.

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Dual-cutting vitrectomy probes (HYPERVIT) offer significantly greater aspiration flow and reduced nearfield effects and traction compared to single-cutting probes (Advanced ULTRAVIT). This enhances surgical safety and efficiency in vitreoretinal procedures.

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Area of Science:

  • Ophthalmology
  • Surgical Technology
  • Biomedical Engineering

Background:

  • Vitreoretinal surgery relies on specialized probes for tissue removal.
  • Optimizing probe performance is crucial for surgical outcomes and patient safety.
  • Comparing different probe designs, such as single-cutting versus dual-cutting, is essential for advancing surgical techniques.

Purpose of the Study:

  • To compare the flow rates, nearfield effects, and traction of a dual-cutting 20,000 cycles per minute (cpm) vitrectomy probe (HYPERVIT) against a single-cutting 10,000 cpm probe (Advanced ULTRAVIT).

Main Methods:

  • Flow rates were measured using balanced salt solution and porcine vitreous across various duty cycles for 25+ and 27+ gauge probes.
  • Nearfield effects and flow pulsatility were assessed via a validated microparticle image velocimetry simulation model.
  • Traction was quantified by measuring vitreous deflection on a cantilever beam.

Main Results:

  • HYPERVIT probes demonstrated significantly greater aqueous and vitreous flow rates compared to Advanced ULTRAVIT probes at maximum cutting speeds.
  • Aqueous flow was 62%-67% greater (25+) and 63% greater (27+) with HYPERVIT.
  • Vitreous flow was 44%-47% greater (25+) and 26%-32% greater (27+) with HYPERVIT. Nearfield effects and peak traction forces were significantly reduced with HYPERVIT.

Conclusions:

  • Dual-action vitrectomy probes exhibit superior aspiration flow compared to single-action probes.
  • Reduced nearfield effects and lower traction forces were observed with the dual-action HYPERVIT probe.
  • These findings suggest improved safety and efficacy of dual-action probes in vitreoretinal surgery.