Biomechanical causes for failure of the Physiomesh/Securestrap system

Area of Science:

• Biomedical Engineering
• Materials Science
• Surgical Innovation

Background:

• Hernia repair systems, such as the Physiomesh/Securestrap, are crucial for IPOM procedures but face high failure rates.
• Understanding the mechanical behavior of these implant-tissue systems is essential for improving surgical outcomes.

Purpose of the Study:

• To investigate the mechanical behavior of the Physiomesh/Securestrap system under pressure load.
• To identify the biomechanical factors contributing to the high failure rates of this hernia repair system.

Main Methods:

• Conducted uniaxial tension tests to determine mesh elasticity and fixation strength.
• Performed ex-vivo experiments on porcine abdominal wall models under simulated intra-abdominal pressure.
• Utilized finite element analysis (FEA) for numerical simulations to support experimental findings.

Main Results:

• Physiomesh exhibits nonlinear, anisotropic, and non-homogeneous mechanical properties, with stress concentration in the polydioxanone (PDO) stripe.
• The mesh-tissue-staple junction demonstrated insufficient fixation strength, leading to staple pull-out or breakage.
• Ex-vivo models and FEA simulations confirmed system failure under elevated pressure loads due to exceeding junction strength.

Conclusions:

• The Physiomesh/Securestrap system's mechanical properties and fixation limitations contribute to its failure in IPOM procedures.
• Biomechanical insights are critical for developing next-generation hernia repair implants that better replicate healthy abdominal wall mechanics.
• This research informs the design of more robust and reliable surgical implants to reduce complications and improve patient recovery.