Effect of vibration frequency on biopsy needle insertion force
Lei Tan1, Xuemei Qin2, Qinhe Zhang1
1School of Mechanical Engineering, Shandong University, Jinan 250061, China; Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, Shandong University, Jinan 250061, China.
Medical Engineering & Physics
|March 6, 2017
Summary
Vibrating needles during insertion increase insertion force by raising needle-tip velocity. Higher frequencies, like 500Hz, significantly amplify this effect compared to lower frequencies (50Hz), impacting medical procedures.
Area of Science:
- Biomedical Engineering
- Medical Device Technology
- Robotics in Medicine
Background:
- Needle insertion is fundamental to numerous clinical procedures, including biopsies, brachytherapy, and injections.
- Precise control over needle insertion force is crucial for patient safety and procedure efficacy.
Purpose of the Study:
- To investigate the influence of vibration frequency on the force required for needle insertion.
- To develop and validate a dynamic model explaining the relationship between insertion force, needle-tip velocity, and vibration.
Main Methods:
- A two-degrees-of-freedom platform was used to conduct needle insertion experiments.
- A dynamic model was developed using gel phantom deformation and the Voigt model to correlate insertion force and needle-tip velocity.
- Needle insertions were performed into phantom gel to verify the model's accuracy.
Main Results:
- Vibration increases needle-tip velocity, which in turn elevates insertion force.
- Experimental results showed a significant increase in insertion force with higher vibration frequencies.
- Specifically, a 17.9% increase in insertion force was observed at 500Hz compared to 50Hz.
Conclusions:
- Vibration frequency is a critical parameter influencing needle insertion dynamics.
- The developed dynamic model accurately predicts the relationship between vibration, needle-tip velocity, and insertion force.
- Understanding these dynamics can lead to optimized needle insertion techniques in clinical applications.
