Karl Thomas Boden1, Martina Mariacher2, Kai Januschowski2,3, Katrin Boden2, Annekatrin Rickmann2, Peter Szurman2,3, Berthold Seitz4, Siegfried Mariacher2. 1. Knappschaft Eye Clinic Sulzbach, Knappschaft Hospital Saar, An der Klinik 10, 66280, Sulzbach, Germany. Karl.Boden@kksaar.de. 2. Knappschaft Eye Clinic Sulzbach, Knappschaft Hospital Saar, An der Klinik 10, 66280, Sulzbach, Germany. 3. Centre for Ophthalmology, University Eye Hospital Tuebingen, Schleichstr. 12, 72076, Tuebingen, Germany. 4. Department of Ophthalmology, Saarland University Medical Center UKS, Homburg Saar, Germany.
Abstract
PURPOSE: A stable and reliable vacuum is crucial for the correct planning and performance of femtosecond laser-assisted cataract surgery (FLACS) in order to avoid complications such as suction loss and cyclorotation. This study investigates, for the first time, the impact of different vacuum levels on the stability of the application of a liquid patient interface for FLACS in view of break-away forces. METHODS: Break-away forces were measured using a multifunctional material testing machine with a mounted digital manometer. Sixteen porcine eyes were docked to the patient interface of a femtosecond laser platform (FEMTO LDV Z8), and the impact of different vacuum levels between 300 and 500 mbar investigated. RESULTS: Mean break-away forces for each vacuum level were as follows: 1.78 N (± 0.58 N) for 300 mbar; 2.24 N (± 0.68 N) for 350 mbar; 2.66 N (± 0.68 N) for 400 mbar; 2.86 N (± 0.77 N) for 420 mbar; and 3.49 N (± 0.86 N) for 500 mbar. CONCLUSION: The stability increases with the vacuum in a nearly linear manner. Vacuum levels higher than 500 mmHg and lower than 350 mmHg are not recommended for FLACS.
PURPOSE: A stable and reliable vacuum is crucial for the correct planning and performance of femtosecond laser-assisted cataract surgery (FLACS) in order to avoid complications such as suction loss and cyclorotation. This study investigates, for the first time, the impact of different vacuum levels on the stability of the application of a liquid patient interface for FLACS in view of break-away forces. METHODS: Break-away forces were measured using a multifunctional material testing machine with a mounted digital manometer. Sixteen porcine eyes were docked to the patient interface of a femtosecond laser platform (FEMTO LDV Z8), and the impact of different vacuum levels between 300 and 500 mbar investigated. RESULTS: Mean break-away forces for each vacuum level were as follows: 1.78 N (± 0.58 N) for 300 mbar; 2.24 N (± 0.68 N) for 350 mbar; 2.66 N (± 0.68 N) for 400 mbar; 2.86 N (± 0.77 N) for 420 mbar; and 3.49 N (± 0.86 N) for 500 mbar. CONCLUSION: The stability increases with the vacuum in a nearly linear manner. Vacuum levels higher than 500 mmHg and lower than 350 mmHg are not recommended for FLACS.
Authors: Kendall E Donaldson; Rosa Braga-Mele; Florence Cabot; Richard Davidson; Deepinder K Dhaliwal; Rex Hamilton; Mitchell Jackson; Larry Patterson; Karl Stonecipher; Sonia H Yoo Journal: J Cataract Refract Surg Date: 2013-11 Impact factor: 3.351
Authors: Martina Ebner; Siegfried Mariacher; Kai Januschowski; Katrin Boden; Anna-Maria Seuthe; Peter Szurman; Karl Thomas Boden Journal: Br J Ophthalmol Date: 2017-05-25 Impact factor: 4.638
Authors: Jonathan H Talamo; Philip Gooding; David Angeley; William W Culbertson; Georg Schuele; Daniel Andersen; George Marcellino; Emma Essock-Burns; Juan Batlle; Rafael Feliz; Neil J Friedman; Daniel Palanker Journal: J Cataract Refract Surg Date: 2013-02-21 Impact factor: 3.351