Quantification of Cannula Influence on Negative Pressure in Syringe-Assisted Liposuction.

Area of Science:

• Plastic Surgery
• Biomedical Engineering

Background:

• Autologous fat transfer is a common procedure.
• Syringe-assisted liposuction is frequently used for small-volume fat grafting procedures.
• Optimizing negative pressure during liposuction is essential for satisfactory results and graft survival.

Purpose of the Study:

• To quantify the influence of cannula size on negative pressure in syringe-assisted liposuction.
• To determine the relationship between cannula volume, syringe pull, and generated negative pressure.
• To provide data for optimizing fat transfer techniques.

Main Methods:

• Experiments were conducted using a digital manometer connected to a syringe and seven different cannulas.
• Negative pressure measurements were recorded and analyzed using LabVIEW and Matlab.
• The volume of the measurement setup was calculated using Boyle-Mariotte's law.

Main Results:

• The volume of the measurement setup significantly impacts negative pressure readings.
• Cannula size significantly influences the negative pressure generated, with notable differences observed across various cannulas.
• Cannulas with volumes under 1.75 mL, with a 2 mL syringe pull, can generate up to -0.5 bar negative pressure.

Conclusions:

• Cannula size is a critical parameter that must be considered in syringe-assisted liposuction to avoid excessive negative pressure.
• Excessive negative pressure can reduce adipocyte vitality and the stromal vascular fraction, negatively impacting fat graft survival.
• Careful selection of cannula size is necessary for predictable and satisfactory autologous fat transfer outcomes.