How does sutures pattern influence stomach motility after endoscopic sleeve gastroplasty? A computational study

Area of Science:

• Biomechanical Engineering
• Medical Device Design
• Computational Surgery

Background:

• Endoscopic Sleeve Gastroplasty (ESG) is a minimally invasive procedure for obesity management, recognized for its safety and efficacy.
• Despite clinical success, a lack of standardized suture techniques and quantitative methods to assess their biomechanical impact persists.
• Current understanding of how different suture patterns affect gastric tissue mechanics during ESG is limited.

Purpose of the Study:

• To introduce a computational approach for evaluating and comparing the biomechanical effects of different ESG suture patterns.
• To provide a quantitative framework for assessing suture configurations beyond traditional in vivo observations.
• To analyze the mechanical performance of C-shaped, U-shaped, and Z-shaped suture patterns in a patient-specific stomach model.

Main Methods:

• Development of a patient-specific computational stomach model using magnetic resonance imaging data.
• Simulation of intragastric conditions using wire features to represent sutures and applying internal pressures up to 15 mmHg.
• Analysis of pressure-volume relationships and maximum stress distribution across biological tissues for each suture pattern.

Main Results:

• The U-shaped suture pattern demonstrated superior gastric volume reduction.
• The U-shaped pattern exhibited reduced tissue elongation strains but increased tissue stresses.
• The Z-shaped suture pattern resulted in the most significant stomach shortening post-procedure.

Conclusions:

• Computational biomechanics offers valuable insights into tissue behavior during ESG, complementing in vivo studies.
• This approach enables objective mechanical comparisons between different suture configurations.
• The study highlights the potential of U-shaped and Z-shaped sutures for optimizing ESG outcomes, though further clinical correlation is needed.