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Cornering: A Geometric Framework for Surgical Dissection in Minimally Invasive Surgery
Sangchul Kim1, Shunsuke Omori1, Koki Takazawa1
1Gastrointestinal and General Surgery, Tokyo Metropolitan Institute for Geriatrics and Gerontology, Itabashi, Tokyo, Japan.
Surgical Innovation
|May 11, 2026
Summary
This study introduces Cornering, a geometric framework for surgical dissection. It explains how maintaining specific angles and tension allows for precise tissue cutting in minimally invasive surgery (MIS).
Area of Science:
- Surgical Techniques
- Geometric Analysis
- Medical Education
Background:
- Precise tissue dissection is crucial in minimally invasive surgery (MIS) but often taught implicitly.
- Established principles like triangulation and traction-countertraction guide exposure and transection.
- Geometric conditions for dynamic dissection along tissue interfaces remain unclear.
Purpose of the Study:
- To introduce Cornering, a conceptual framework for understanding surgical dissection.
- To define geometric conditions enabling dissection advancement along tissue interfaces.
- To formalize surgical dissection as a reproducible process.
Main Methods:
- Schematic geometric analysis of surgical dissection.
- Focus on relationships between traction, tissue surfaces, and dissecting edge.
- Introduction of Cornering, planarization, and decornering concepts.
Main Results:
- Cornering framework emphasizes maintaining a 3D dihedral angle for effective dissection.
- Inefficient dissection linked to insufficient traction, poor angulation, or loss of depth.
- Identified surface-based and axis-based Cornering modes.
Conclusions:
- Cornering formalizes surgical dissection, enhancing reproducibility.
- Extends triangulation and traction-countertraction principles.
- Offers a practical model for surgical education, assessment, and standardization in MIS.
