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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

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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.

Keywords:

geometric framework laparoscopic surgery minimally invasive surgery robotic surgery surgical dissection surgical education

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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.