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Bioinspired design proposal for a new external bone fixator device.

Carla Buso^1,2, Plínio Zanini^1,2, Silvia Titotto^1,2

¹Center of Engineering, Modeling and Applied Social Science, Federal University of ABC (UFABC), Santo André, Brazil.

Biomedical Physics & Engineering Express

|January 31, 2022

Summary

This study introduces a novel flexible external fixator inspired by DNA condensation. Prototyping and computational analysis show that designs with fewer, thinner beams offer superior flexibility and range of motion.

Keywords:

biomimicry flexibility ilizarov external fixator pseudo-rigid models method

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Area of Science:

Biomedical Engineering
Materials Science
Bioinspired Design

Background:

Traditional rigid external fixators present limitations in patient comfort and adaptability.
Bioinspiration from biological mechanisms offers novel design principles for medical devices.

Purpose of the Study:

To introduce and evaluate a novel flexible external fixator inspired by DNA condensation.
To assess the performance of bioinspired flexible external fixator prototypes through prototyping and computational analysis.

Main Methods:

Design and prototyping of a flexible external fixator using hot glue manufacturing.
Computational modeling using pseudo-rigid body modeling technique.
Linear static analysis for computational simulations.
Experimental analysis of prototype performance including flexibility, height variation, and rotation arc.

Main Results:

Experimental analysis indicated that prototypes with fewer and thinner beams demonstrated superior flexibility, height variation, and rotation arc.
Computational analysis revealed that a model with 8 beams performed optimally.
Optimal beam thickness for computational models was found to be 8 mm.
A beam length of 100 mm provided the best balance of parameters in computational models.

Conclusions:

The bioinspired flexible external fixator demonstrates proof-of-concept for dynamic functioning and effectiveness.
Design parameters such as beam number, thickness, and length significantly influence the performance of the flexible external fixator.
Further research into optimizing the design of flexible external fixators holds potential for improved orthopedic treatments.