| The risk of capsular breakage from phacoemulsification needle contact with the lens capsule: a laboratory study. | |
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MedLine Citation:
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PMID: 20231013 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To determine capsular breakage risk from contact by phacoemulsification needles by machine and tip type. DESIGN: Experimental laboratory investigation. METHODS: Infiniti (Alcon, Inc.) with Intrepid cartridges and Signature (Abbott Medical Optics, Inc.) phacoemulsification machines were tested using 19- and 20-gauge sharp and rounded tips. Actual and unoccluded flow vacuum were determined at 550 mm Hg, bottle height of 75 cm, and machine-indicated flow rate of 60 mL/minute. Breakage from brief tip contact with a capsular surrogate and human cadaveric lenses was calculated. RESULTS: Nineteen-gauge tips had more flow and less unoccluded flow vacuum than 20-gauge tips for both machines, with highest unoccluded flow vacuum in the Infiniti. The 19-gauge sharp tip was more likely than the 20-gauge sharp tip to cause surrogate breakage for Signature with micropulse and Ellips (Abbott Medical Optics, Inc.) ultrasound at 100% power. For Infiniti using OZil (Alcon, Inc.) ultrasound, 20-gauge sharp tips were more likely than 19-gauge sharp tips to break the membrane. For cadaveric lenses, using rounded 20-gauge tips at 100% power, breakage rates were micropulse (2.3%), Ellips (2.3%), OZil (5.3%). Breakage rates for sharp 20-gauge Ellips tips were higher than for rounded tips. CONCLUSIONS: Factors influencing capsular breakage may include active vacuum at the tip, flow rate, needle gauge, and sharpness. Nineteen-gauge sharp tips were more likely than 20-gauge tips to cause breakage in lower vacuum methods. For higher-vacuum methods, breakage is more likely with 20-gauge than with 19-gauge tips. Rounded-edge tips are less likely than sharp-edged tips to cause breakage. |
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Authors:
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Jay J Meyer; Annie F Kuo; Randall J Olson |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't Date: 2010-03-15 |
Journal Detail:
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Title: American journal of ophthalmology Volume: 149 ISSN: 1879-1891 ISO Abbreviation: Am. J. Ophthalmol. Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-05-31 Completed Date: 2010-06-17 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0370500 Medline TA: Am J Ophthalmol Country: United States |
Other Details:
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Languages: eng Pagination: 882-886.e1 Citation Subset: AIM; IM |
Copyright Information:
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Copyright 2010 Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Ophthalmology and Visual Sciences, John A. Moran Eye Center, University of Utah, Salt Lake City, Utah 84132, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Eye Injuries
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etiology* Humans Lens Capsule, Crystalline / injuries* Microsurgery / instrumentation Models, Biological Needles / adverse effects* Phacoemulsification / instrumentation* Risk Assessment Rupture Vacuum |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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