Perforation forces of the intact porcine anterior lens capsule
| Autor: | Franziska Ullrich, Jonas Lussi, Bradley J. Nelson, Dimitrios Felekis, Andrew J. Petruska, Stephan Michels |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Swine medicine.medical_treatment Perforation (oil well) Lens Capsule Crystalline Biomedical Engineering 02 engineering and technology Biomaterials 03 medical and health sciences 0302 clinical medicine Lens Implantation Intraocular Indentation Anterior lens capsule medicine Animals Humans Capsulorhexis Lens capsule Anatomy Cataract surgery 021001 nanoscience & nanotechnology Biomechanical Phenomena medicine.anatomical_structure Needles Mechanics of Materials Capsular bag 030221 ophthalmology & optometry Human eye 0210 nano-technology Biomedical engineering |
| Zdroj: | Journal of the Mechanical Behavior of Biomedical Materials. 62:347-354 |
| ISSN: | 1751-6161 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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