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A study on modeling the deflection of surgical needle during insertion into multilayer tissues
Samer Al-Safadi1, Parsaoran Hutapea1
1Department of Mechanical Engineering, Temple University, Philadelphia, PA, USA.
Journal of the Mechanical Behavior of Biomedical Materials
|August 13, 2023
Summary
This study developed a model to predict bevel tip needle deflection during insertion into soft tissues. The model accurately predicts needle tip deflection, crucial for improving surgical accuracy and patient outcomes.
Area of Science:
- Biomedical Engineering
- Medical Device Design
- Surgical Simulation
Background:
- Needle and catheter insertions are standard clinical procedures.
- Bevel tip surgical needles often deflect, leading to target miss during tissue insertion.
Purpose of the Study:
- To understand needle-tissue interaction mechanics.
- To develop a predictive model for bevel tip needle deflection in multi-layered soft tissues.
Main Methods:
- Examined needle-tissue interaction mechanics and modeled insertion forces (cutting, deformation, friction).
- Utilized modified Euler-Bernoulli beam elastic foundation theory for an analytical deflection model.
- Validated the analytical model against experimental needle insertion data in phantom tissues.
Main Results:
- Force measurements showed an 8%-23% difference between analytical and experimental values.
- The analytical deflection model demonstrated a 9%-21% error compared to experimental results.
- The proposed model accurately predicts needle tip deflection during insertion.
Conclusions:
- The developed analytical model provides accurate predictions of needle tip deflection.
- This model can aid in improving the precision of needle insertion procedures.
- Understanding needle-tissue interaction is key to minimizing deflection and enhancing surgical success.
