Modifications of Surgical Suction Tip Geometry for Flow Optimisation: Influence on Suction-Induced Noise Pollution

Area of Science:

• Surgical Engineering
• Biomedical Acoustics
• Medical Device Design

Background:

• Surgical suction devices are essential for maintaining a clear surgical field.
• High noise levels from suction devices can cause stress, impede decision-making, and potentially lead to hearing damage in patients and staff.
• Existing suction tip designs have not adequately addressed noise reduction.

Purpose of the Study:

• To analyze the flow-dependent noise emissions of different surgical suction tips.
• To develop and evaluate improved surgical suction tip designs for noise reduction.

Main Methods:

• Compared five suction tip geometries (two standard, three custom-designed) in a standardized in vitro setup.
• Measured flow-dependent noise emission (dB, A-weighting) and acoustic quality (Hamilton fast Fourier analysis) at various flow rates (10-2000 mL/min).
• Assessed secondary air intake and created noise maps for each device.

Main Results:

• Suction tip geometry significantly impacts noise emission; standard tips produce high-frequency noise (>3 kHz) at higher flow rates.
• Custom-designed tips (specifically new model 2) demonstrated a highly significant reduction in noise levels and improved acoustic quality compared to standard models (p < 0.001).
• Optimized designs achieved a highly significant reduction in secondary air intake (p < 0.001), indicating improved efficiency and reduced turbulence.

Conclusions:

• Modifying the geometry of surgical suction heads effectively reduces noise emissions.
• Optimized suction tips are substantially quieter, potentially mitigating noise-induced hearing damage and reducing surgical staff stress.
• Reduced turbulence and air intake may enhance the quality of collected blood for autologous retransfusion.