Perforation forces of the intact porcine anterior lens capsule

Perforation forces of the intact porcine anterior lens capsule During the first step of cataract surgery, the lens capsule is perforated and a circular hole is created with a sharp instrument, a procedure called capsulorhexis. To develop automated systems that can assist ophthalmologists during capsulorhexis, the forces required must be quantified. This study investigates perforation forces of the central anterior lens capsule in porcine eyes, which are used as a conservative model for the human eye. A micro-mechanical characterisation method is presented that measures capsular bag perforation forces with a high precision positioning and high-resolution force sensing system. The force during perforation of the anterior lens capsule was measured with various sized needles and indentation speeds and is found to be 15–35mN. A bio-mechanical model is identified that describes an exponential correlation between indentation force and depth, indicating strain hardening behaviour of the porcine anterior lens capsule. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Mechanical Behavior of Biomedical Materials Elsevier

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Publisher
Elsevier
Copyright
Copyright © 2016 Elsevier Ltd
ISSN
1751-6161
eISSN
1878-0180
D.O.I.
10.1016/j.jmbbm.2016.05.007
Publisher site
See Article on Publisher Site

Abstract

During the first step of cataract surgery, the lens capsule is perforated and a circular hole is created with a sharp instrument, a procedure called capsulorhexis. To develop automated systems that can assist ophthalmologists during capsulorhexis, the forces required must be quantified. This study investigates perforation forces of the central anterior lens capsule in porcine eyes, which are used as a conservative model for the human eye. A micro-mechanical characterisation method is presented that measures capsular bag perforation forces with a high precision positioning and high-resolution force sensing system. The force during perforation of the anterior lens capsule was measured with various sized needles and indentation speeds and is found to be 15–35mN. A bio-mechanical model is identified that describes an exponential correlation between indentation force and depth, indicating strain hardening behaviour of the porcine anterior lens capsule.

Journal

Journal of the Mechanical Behavior of Biomedical MaterialsElsevier

Published: Sep 1, 2016

References

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