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A Precessing-Coin-like Rotary Actuator for Distal Endoscope Scanners: Proof-of-Concept Study.

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Area of Science:

  • Biomedical Engineering
  • Optical Engineering
  • Medical Imaging

Background:

  • Endoscopic procedures require advanced imaging capabilities for diagnosis and treatment.
  • Current endoscopic scanners face limitations in miniaturization and reliability.
  • Need for compact, high-performance distal scanners for multimodal imaging.

Purpose of the Study:

  • To present a novel rotary actuator for distal optical scanning in endoscopic probes.
  • To enable side-viewing endoscopy with 360° scanning capabilities.
  • To facilitate multimodal imaging using techniques like optical coherence tomography and Raman spectroscopy.

Main Methods:

  • Development of a rotary actuator with an inclined disc rotor and a magnetic backside mirror.
  • Electromagnetic driving mechanism to induce a precessing motion of the rotor.
  • Integration with endoscopic probes for optical beam redirection and scanning.
  • Proof-of-concept fabrication using 3D printing and experimental analysis.

Main Results:

  • Demonstrated angular stepping at 45° and high-speed rotation up to 1500 rpm.
  • Confirmed operation within biologically safe temperature ranges.
  • Achieved continuous circumferential scanning without blind spots.
  • Simplified scanner design by eliminating separate prism mirrors and holding mechanics.

Conclusions:

  • The developed actuator is fundamentally feasible as an endoscopic distal scanner.
  • The novel design enhances miniaturization and reliability for endoscopic devices.
  • Represents a significant advancement for optical endoscope technology and multimodal imaging.