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Biomechanical evaluation of multi-bevel angled flexible needle insertion to improve deflection and decrease insertion
H M Muzzammil1,2, Yongde Zhang3, Suoliang Niu1
1Key Laboratory of Advanced Manufacturing and Intelligent Technology, Harbin University of Science and Technology, Harbin, 150080, China.
Scientific Reports
|July 19, 2026
Summary
A new dual-bevel needle design enhances steerability in minimally invasive procedures. This innovative needle configuration improves deflection and reduces insertion force, leading to greater precision and safety for targeting critical anatomical organs.
Area of Science:
- Medical Devices
- Robotics
- Biomedical Engineering
Background:
- Flexible needles are crucial for minimally invasive procedures, enabling navigation around delicate anatomical structures.
- Needle steerability is determined by bevel tip design, which influences force distribution and tissue interaction.
- Current single-bevel designs present trade-offs between deflection, insertion force, and penetration resistance.
Purpose of the Study:
- To investigate a novel multi-bevel-angle needle design for enhanced steerability and controlled force distribution.
- To optimize needle tip geometry for improved deflection and reduced tissue penetration resistance during insertion.
- To develop and validate a computational model for predicting flexible needle behavior in tissue.
Main Methods:
- A dual-bevel needle with 30° and 15° angles was designed and fabricated.
- A computational model combining hyperelastic material properties (Mooney-Rivlin) and beam theory (Euler-Bernoulli) was developed.
- Experimental validation was performed using agar-based tissue phantoms with characterized mechanical properties.
Main Results:
- The (30°+15°) dual-bevel needle achieved 16.00 mm deflection at 130 mm depth, outperforming single-bevel needles.
- This dual-bevel design demonstrated a 12-19.5% increase in deflection compared to single-bevel designs, with a low insertion force of 2.34 N.
- The analytical model showed high correlation (R² > 0.95) with experimental data for needle deflection and trajectory.
Conclusions:
- The multi-bevel-angle needle strategy significantly enhances flexible needle steering capabilities.
- The developed computational model accurately predicts needle-tissue interaction and deflection, aiding in design optimization.
- This approach offers improved targeting accuracy for clinical applications in minimally invasive surgery.
