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Soft Tissue Phantoms for Realistic Needle Insertion: A Comparative Study.

Alexander Leibinger¹, Antonio E Forte¹, Zhengchu Tan¹

¹Department of Mechanical Engineering, Imperial College London, Exhibition Road, South Kensington, London, SW7 2AZ, UK.

Annals of Biomedical Engineering

|December 16, 2015

Summary

This summary is machine-generated.

Researchers compared gelatin and composite hydrogel phantoms against porcine brain for biomechanical research. Neither phantom perfectly replicates brain tissue, highlighting the need to consider both material properties and tool-tissue interactions.

Keywords:

Brain Digital image correlation Gelatin Minimally invasive surgery Soft tissue biomechanics Strain imaging Tool-tissue interactions

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Area of Science:

Biomechanics
Biomaterials Science
Medical Device Research

Background:

Phantoms are crucial for simulating soft tissues in biomechanical research.
Current methods often match mechanical stiffness at small strains, but complex interactions may differ.
A lack of comparative studies hinders optimal phantom material selection for tool-tissue interaction research.

Purpose of the Study:

To compare the tool-tissue interactions of gelatin and a composite hydrogel against porcine brain.
To analyze insertion forces, displacements, and strains during needle insertion in these materials.
To provide guidance for selecting appropriate phantom materials for biomechanical studies.

Main Methods:

Mechanical stiffness matching of gelatin and composite hydrogel to porcine brain.
Analysis of needle insertion forces for brain and phantoms.
Measurement of internal displacements and strains using laser-based image correlation with fluorescent beads.

Main Results:

Insertion forces for gelatin closely matched those of porcine brain.
The composite hydrogel demonstrated a better mimicry of the viscous properties of soft tissue.
Neither gelatin nor the composite hydrogel served as a perfect substitute for porcine brain tissue.

Conclusions:

Both gelatin and composite hydrogels replicate certain aspects of brain tissue behavior.
Phantom material selection must account for both intrinsic tissue properties and dynamic tool-tissue interactions.
A comprehensive understanding of these interactions is vital for accurate biomechanical research and medical device development.