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Performance Analysis of a CSFH-Based Microgripper: Analytical Modeling and Simulation.

Teferi Sitotaw Yallew1,2, Nicola Pio Belfiore3, Alvise Bagolini2

  • 1Department of Civil, Environmental and Mechanical Engineering, University of Trento, 38123 Trento, Italy.

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|September 23, 2022
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Summary

This study presents a novel biocompatible microgripper for precise cell manipulation. It utilizes conjugate surface flexure hinges to enhance displacement, enabling the handling of biological samples within a specific size range.

Keywords:
FEMMEMScell characterizationmicro-manipulation

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Area of Science:

  • Biomedical Engineering
  • Micro-robotics
  • MEMS Technology

Background:

  • Microgrippers are essential for micro-scale manipulation and cell characterization.
  • Existing electrothermal actuators often have limited displacement capabilities.
  • Biocompatibility is crucial for in-vivo or in-vitro biological applications.

Purpose of the Study:

  • To develop a biocompatible electro-thermally actuated microgripper with enhanced displacement.
  • To integrate a rotary capacitive position sensor for precise control.
  • To enable manipulation of biological samples in the 15-120 µm size range.

Main Methods:

  • Utilized conjugate surface flexure hinges (CSFH) to amplify actuator displacement.
  • Applied pseudo-rigid-body-method (PRBM) for kinematic modeling.
  • Employed finite element method (FEM) for actuator design optimization and thermal analysis.

Main Results:

  • The microgripper design overcomes limitations of conventional electrothermal actuators.
  • FEM simulations verified the performance of the microgripper, actuator, and heat dissipation.
  • The analytical modeling approach was validated through simulations.

Conclusions:

  • The developed microgripper offers a promising solution for precise manipulation of small biological samples.
  • The integration of CSFH significantly improves the microgripper's functional displacement.
  • The study validates the effectiveness of the applied modeling techniques for microgripper design.