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A novel design for steerable instruments based on laser-cut nitinol.

Frank Dewaele1, Alain F Kalmar2, Frederic De Ryck3

  • 1Ghent University Hospital, Ghent, Belgium frank.dewaele@ugent.be.

Surgical Innovation
|February 11, 2014
PubMed
Summary

A novel laser-cutting technique enables the creation of steerable endoscopic instruments from coaxial tubes. This technology enhances dexterity for neurosurgery and provides tip stability for laparoscopic devices.

Keywords:
endoscopylaparoscopylasermicroinstrumentsnitinolsingle port surgerysteerable

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Area of Science:

  • Medical Devices
  • Surgical Technology
  • Minimally Invasive Surgery

Background:

  • Omnidirectional articulated instruments improve surgical dexterity.
  • Simultaneous use of multiple instruments in neurosurgery is challenging due to space constraints.
  • Manufacturing small-diameter steerable instruments is difficult.

Purpose of the Study:

  • To present a new laser-cutting technique for producing steerable endoscopic instruments.
  • To demonstrate the feasibility of creating instruments from coaxial tubes.
  • To enable simultaneous instrument use in neurosurgery and enhance tip stability in laparoscopy.

Main Methods:

  • Coaxial nitinol tubes were laser-cut using a Rofin Stent Cutter.
  • A specific cutting pattern was applied to enable steering force transmission.
  • Three tubes were assembled into a single composite tube.
  • Neurosurgical microinstruments and laparoscopic needle drivers were tested in a surgical simulator.

Main Results:

  • Simultaneous use of two 1.5 mm neurosurgical instruments was intuitive.
  • Steerable laparoscopic instruments (10 mm diameter) resisted >20 N lateral force.
  • Instruments achieved an angle of motion of at least 70° in any direction.

Conclusions:

  • A novel design for steerable endoscopic instruments was developed.
  • The technique allows for instrument construction ranging from microinstruments to 10-mm laparoscopic devices.
  • The technology offers excellent tip stability for various surgical applications.