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Characterizing Pressure and Flow Rate for Aqueous Immersion Surgery.

Tyson A Montidoro1, James E Burgess2, James F Antaki3

  • 1Carnegie Mellon University, Pittsburgh, PA, USA.

Surgical Innovation
|May 14, 2015
PubMed
Summary

Aqueous immersion surgery (AIS) uses hydraulic pressure to maintain a bloodless surgical field, improving safety. This study numerically investigated fluid dynamics to optimize AIS for better surgical clarity and bleeding control.

Keywords:
CFDaqueous immersion surgeryblood managementfluid surgeryhemodynamicshemostasismulticomponent flowsurgical fluid managementsurgical system

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Area of Science:

  • Surgical Innovation
  • Biomedical Engineering
  • Fluid Dynamics

Background:

  • Hemorrhage control is a critical surgical challenge impacting procedure safety and efficacy.
  • Current hemostasis methods divert surgeon focus from the primary surgical task.
  • A novel Aqueous Immersion Surgery (AIS) method aims to create a bloodless field using hydraulic pressure.

Purpose of the Study:

  • To numerically investigate the impact of immersion fluid exchange rate on blood concentration and optical clarity in AIS.
  • To evaluate the influence of immersion pressure and flow dynamics on bleeding control and field visualization.
  • To establish fluid dynamic guidelines for optimizing AIS technology.

Main Methods:

  • A 3-dimensional multicomponent simulation was employed to model blood mixing from a pulsatile arterial bleeding vessel.
  • The study analyzed the effects of varying immersion pressure and fluid flow rates on bleeding reduction and optical clarity.
  • Fluid dynamics of blood trajectory deflection and removal from the surgical field were assessed.

Main Results:

  • Increased immersion pressure effectively reduced bleeding and enhanced perfusion.
  • Flow field dynamics significantly influenced blood trajectory and removal rates.
  • An optimal immersion flow rate was identified for specific immersion pressures (100 and 110 mm Hg) in idealized scenarios.

Conclusions:

  • AIS demonstrates potential for maintaining a bloodless surgical field and clear visualization.
  • Fluid dynamic principles are crucial for optimizing AIS performance.
  • The findings provide foundational guidelines for the future development and clinical application of Aqueous Immersion Surgery.