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Design and Fabrication of an Elastomeric Unit for Soft Modular Robots in Minimally Invasive Surgery
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A robust uniaxial force sensor for minimally invasive surgery.

Michael C Yip1, Shelten G Yuen, Robert D Howe

  • 1Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, BC, Canada. myip@ece.ubc.ca

IEEE Transactions on Bio-Medical Engineering
|February 23, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a novel miniature force sensor for heart surgery. The device provides accurate, real-time force measurements during mitral valve procedures, enhancing surgical precision.

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Area of Science:

  • Biomedical Engineering
  • Medical Devices
  • Surgical Instrumentation

Background:

  • Mitral valve annuloplasty requires precise force control.
  • Existing sensors may interfere with cardiac procedures or imaging.
  • Real-time force feedback during surgery is limited.

Purpose of the Study:

  • To develop and validate a miniature uniaxial force sensor for use in beating hearts during mitral valve annuloplasty.
  • To enable direct measurement of instrument-tissue interaction forces within the heart.
  • To improve the safety and efficacy of minimally invasive cardiac surgery.

Main Methods:

  • Designed a 5.5 mm diameter, 12 mm length sensor with a hollow core and soft elastomer flexure for a waterproof seal.
  • Utilized fiber optic transduction to eliminate internal electrical components.
  • Employed acetal for minimized ultrasound-imaging artifacts.
  • Calibrated the sensor using a nonlinear viscoelastic method.

Main Results:

  • In vitro tests showed a 0-4 N force range with root-mean-square errors below 3.2% (0.13 N).
  • The sensor maintained a waterproof seal.
  • Ultrasound imaging artifacts were minimized.
  • First in vivo endocardial measurements of instrument interaction forces in a beating heart were obtained.

Conclusions:

  • The novel miniature force sensor is suitable for real-time force monitoring during mitral valve annuloplasty.
  • The sensor design addresses key challenges including size, waterproofing, electrical safety, and imaging compatibility.
  • This technology has the potential to improve surgical outcomes in minimally invasive cardiac procedures.