April 2014
Volume 55, Issue 13
Free
ARVO Annual Meeting Abstract  |   April 2014
Design parameters for a small-gauge fragmatome
Author Affiliations & Notes
  • William J Foster
    Ophthalmology & Bioengineering, Temple University, Philadelphia, PA
  • Jizhou Wang
    Temple University, Philadelphia, PA
  • Footnotes
    Commercial Relationships William Foster, William Joseph Foster (P); Jizhou Wang, None
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science April 2014, Vol.55, 4627. doi:
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      William J Foster, Jizhou Wang; Design parameters for a small-gauge fragmatome. Invest. Ophthalmol. Vis. Sci. 2014;55(13):4627.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: Manufacturers of surgical instrumentation have increasingly sought to decrease the size of surgical instruments. We have utilized finite element modeling to model the stress and strain present in a fragmatome as a function of ultrasound energy, frequency, and fragmatome dimensions.

Methods: Finite element calculations using the COMSOL Multiphysics® system v3.5 were utilized to elucidate the influence of tube thickness, ultrasound energy and frequency on a 40mm, titanium alloy fragmatome tube with an outer diameter of 23, 25, and 27 gauge.

Results: By coupling structural mechanics, fluid mechanics, and acoustical physics, we were able to determine the impulse response as well as the ranges of parameters in which the internal strain in the fragmatome tube exceeds 1.6% (ie the linear thermal expansion at the melting point).

Conclusions: The results of our simulations allow us to explain some physical limitations inherent in miniaturizing surgical instrumentation. Such mechanical limitations may require alternative methods, such as laser emulsification, in future microsurgical instruments.

Keywords: 762 vitreoretinal surgery • 688 retina  
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