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Study of soft tissue cutting forces and cutting speeds
Teeranoot Chanthasopeephan1, Jaydev P Desai, Alan C W Lau
1Program for Robotics, Intelligent Sensing, and Mechatronics Laboratory 3141 Chestnut Street, MEM Department, Room# 2-115 Drexel University Philadelphia, PA 19104, USA. teeranoo@coe.drexel.edu
Studies in Health Technology and Informatics
|November 17, 2004
Summary
Researchers designed equipment to study scalpel cutting of soft tissue. They found that liver tissue
Area of Science:
- Biomechanics
- Surgical Engineering
- Materials Science
Background:
- Understanding soft tissue cutting mechanics is crucial for surgical tool design and procedure optimization.
- Existing methods often lack detailed quantification of blade-tissue interactions during incision.
- Novel equipment is needed to precisely measure forces and deformation during surgical cutting.
Purpose of the Study:
- To design and construct versatile equipment for studying soft tissue cutting with surgical scalpels.
- To measure blade-tissue interaction forces and quantify deformation resistance during liver incision.
- To investigate the effect of cutting speed on tissue mechanical properties.
Main Methods:
- Development of specialized equipment for ex-vivo pig liver cutting experiments.
- Measurement of force-displacement curves at varying cutting speeds (0.1–2.54 cm/sec).
- Application of finite element models (plane-stress and plane-strain) to determine local effective Young's modulus (LEYM).
Main Results:
- The liver cutting process exhibits repeating local units, each with linear deformation and crack growth phases.
- A novel method quantified deformation resistance as a self-consistent local effective Young's modulus (LEYM).
- LEYM values derived from plane-stress and plane-strain models showed close agreement.
- Tissue's resistance to deformation decreased significantly with increased cutting speed.
Conclusions:
- The developed equipment enables detailed analysis of surgical scalpel-tissue interactions.
- The local effective Young's modulus (LEYM) provides a quantifiable measure of tissue deformation resistance.
- Cutting speed is a critical factor influencing the mechanical response of soft tissues during incision.