A numerical and experimental study of light obscuration in laparoscopy
Hossein Hadi Najafabadi1,2, Meng Wai Woo3, Vinod Suresh1,4
1Department of Engineering Science, University of Auckland, Auckland, 1142, New Zealand.
BMC Surgery
|November 27, 2025
Summary
Carbon dioxide insufflation effectively reduces light obscuration during laparoscopic electrosurgery (ES). This study shows higher flow rates significantly improve visibility by clearing aerosol particles, aiding surgeon performance.
Area of Science:
- Minimally Invasive Surgery
- Surgical Technology
- Biomedical Engineering
Background:
- Aerosol particles generated during laparoscopic electrosurgery (ES) impair visibility.
- Effective visualization is critical for successful laparoscopic procedures.
Purpose of the Study:
- To investigate the impact of carbon dioxide (CO2) insufflation flow rate on light obscuration caused by ES-generated aerosols.
- To evaluate the efficacy of CO2 flow in clearing surgical smoke.
Main Methods:
- A computational model and experimental setup were used to simulate and measure light obscuration.
- Monopolar ES was performed on excised pig liver, with aerosol particle size distributions measured.
- Simulations incorporated a calculated light extinction coefficient to predict obscuration dynamics.
Main Results:
- Light obscuration increased to 47% after 60s of ES without CO2 flow.
- CO2 insufflation at 5, 10, and 15 L/min reduced obscuration to 13%, 5%, and 2% respectively.
- Simulated aerosol decay rates correlated well with experimental findings.
Conclusions:
- Carbon dioxide insufflation is an effective method for reducing light obscuration during laparoscopic ES.
- Developed computational models accurately capture aerosol transport dynamics.
- The model can predict the effects of insufflation on visibility, potentially improving surgical outcomes.
