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Tactile optical sensor for use in minimal invasive surgery.

H Fischer1, R Trapp

  • 1Forschungszentrum Karlsruhe GmbH, Hauptabteilung Ingenieurtechnik, Karlsruhe, Germany. hafi@hit.fzk.de

Studies in Health Technology and Informatics
|December 9, 1995
PubMed
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This study introduces a novel optical pressure sensor to restore tactile feedback in minimally invasive surgery. The sensor enables graphical display of tissue indurations and vibrotactile feedback for surgeons.

Area of Science:

  • Biomedical Engineering
  • Surgical Technology
  • Sensor Technology

Background:

  • Minimally invasive surgery (MIS) significantly reduces tactile sensation for surgeons.
  • Loss of palpation hinders accurate diagnosis and tissue manipulation during MIS procedures.

Purpose of the Study:

  • To develop a tactile optical pressure sensor for restoring sensory feedback in MIS.
  • To enable graphical display of tissue properties and provide vibrotactile feedback to surgeons.

Main Methods:

  • Developed a tactile optical pressure sensor with 64 measurement points (0.64 cm2) and 12-bit digital resolution.
  • Integrated the sensor into instruments for laparoscopic grasping forceps and a sensing rod (15 mm diameter).
  • Created a 144-pin actuator array (4 cm2) for analog tactile display testing.

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Main Results:

  • The sensor successfully displays tissue indurations graphically.
  • Measured data activates a vibrotactile feedback unit for surgeon's fingertip.
  • The actuator array demonstrated recognition of test objects via exploratory finger movements.

Conclusions:

  • The developed optical pressure sensor effectively restores tactile sensing in MIS.
  • Graphical and vibrotactile feedback enhance surgical precision and diagnostic capabilities.
  • Further research into analog tactile displays is supported by the actuator array findings.