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A variable stiffness mechanism for steerable percutaneous instruments: integration in a needle.

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Summary
This summary is machine-generated.

This study introduces a novel variable stiffness mechanism for percutaneous needles, enhancing maneuverability in soft tissues. The device actively compensates for tissue stiffness variations, improving needle steering and trajectory control during minimally invasive procedures.

Keywords:
Minimally invasive instrumentsNeedle deflectionSteerable needleTissue inhomogeneityVariable stiffness

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Area of Science:

  • Medical Devices
  • Robotics
  • Biomedical Engineering

Background:

  • Minimally invasive procedures rely on precise needle control.
  • Tissue stiffness variations significantly impact needle deflection and maneuverability.
  • Current flexible needles struggle to adapt to inhomogeneous tissue properties.

Purpose of the Study:

  • To develop and evaluate a variable stiffness mechanism for percutaneous needles.
  • To enable active compensation for tissue stiffness variations.
  • To improve needle steering and trajectory accuracy in soft tissues.

Main Methods:

  • A novel mechanism composed of compliant segments and rigid plates with four tension-controlled cables was designed.
  • The mechanism's force exertion capabilities were tested.
  • The integrated needle was evaluated in gelatin phantoms simulating biological tissue stiffness.

Main Results:

  • The mechanism demonstrated a force exertion capability of up to 3.6 N.
  • The integrated needle showed adjustable deflection ranging from 11.6 to 4.4 mm.
  • The device successfully adapted to phantom stiffness variations (21 to 80 kPa) by activating the stiffness mechanism.

Conclusions:

  • The developed variable stiffness mechanism effectively enhances percutaneous needle control.
  • The needle's ability to adapt stiffness allows for improved trajectory management in varying tissue environments.
  • This technology holds potential for safer and more accurate minimally invasive surgeries.