gms | German Medical Science

22. Internationaler Kongress der Deutschen Ophthalmochirurgen

18. bis 21.06.2009, Nürnberg

Capturing the flow in PEA

Meeting Abstract

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  • Takahiro Shimowake - Shimowake Eye Clinic, Ophthalmology, Matsuyama, Japan
  • Hironori Yoshida - Miyoshi Eye Center, Ophthalmology, Fukuyama, Japan
  • Teruyuki Miyoshi - Miyoshi Eye Center, Ophthalmology, Fukuyama, Japan

22. Internationaler Kongress der Deutschen Ophthalmochirurgen. Nürnberg, 18.-21.06.2009. Düsseldorf: German Medical Science GMS Publishing House; 2009. Doc09docVI 1.6

doi: 10.3205/09doc071, urn:nbn:de:0183-09doc0719

Veröffentlicht: 9. Juli 2009

© 2009 Shimowake et al.
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Purpose: To demonstrate the various flow patterns which occur in the antechamber during PEA as a result of phaco mechanisms such as irrigation, aspiration and vibration.

Methods: Three doctors designed and executed experiments using a wide variety of commercially available materials to simulate antechamber flow.

Results: The first series of experiments shed light on the courses of antechamber currents. These experiments examined the flow of currents with the phaco device on foot positions one and two, without vibration. The results of these experiments led to new assumptions about the direction of flow streams.

The second series of experiments examined the impact of tip vibration. Dramatic differences between phaco power modes were revealed by placing the tip in a liquid substance and observing wave created when the tips were turned on. Longitudinal and torsional tips were also compared revealing the effectiveness of torsion PEA.

Conclusions: Chattering and followablilty are longstanding themes when examining the primary reasons for ineffective PEA. Elucidating flow currents and vibration created antechamber flow may lead to new understandings for the reasons of hyper-followability on some power modes and not others; and the causes of chattering. Improving our knowledge of the mechanisms during PEA, improves the ability to perform effective PEA.