ANALYSIS of A 23-GAUGE ULTRA HIGH-SPEED CUTTER WITH DUTY CYCLE CONTROL

ANALYSIS of A 23-GAUGE ULTRA HIGH-SPEED CUTTER WITH DUTY CYCLE CONTROL

Author Diniz, Bruno Autor UNIFESP Google Scholar
Fernandes, Rodrigo B. Autor UNIFESP Google Scholar
Ribeiro, Ramiro M. Google Scholar
Lue, Jaw-Chyng Google Scholar
Teixeira, Anderson G. Autor UNIFESP Google Scholar
Magalhaes, Octaviano Autor UNIFESP Google Scholar
Maia, Mauricio Autor UNIFESP Google Scholar
Humayun, Mark S. Google Scholar
Institution Doheny Eye Inst
Universidade Federal de São Paulo (UNIFESP)
Hosp Evangel Curitiba FEMPAR
Univ So Calif
Abstract Purpose: the purpose of the study was to determine the performance of dual pneumatic ultra high-speed 23-gauge cutters operated with variable duty cycle (DC) settings.Methods: Frame-by-frame analysis of high-speed video was used to determine the DC in core, 50-50, and shave modes. Using three cutters at various cycles per minute and aspiration levels, mass of water or vitreous removed from a vial was measured within a specified time period. Average flow rates were calculated for each aspiration level and cut rate with the different DC options.Results: the DC increased with increasing cut rate in the shave mode was relatively stable in the 50-50 mode and decreased for the core mode. the DC converged at 5,000 cycles per minute for the 3 different modes. Water flow curves followed the DC variation. Vitreous flow rates for all the DC modes increased with increasing cut rates and peaked at 5,000 cycles per minute (P < 0.05). the results of the 50-50 mode, which had isolated the DC influence, showed that increasing aspiration and/or cut rate independently increased the vitreous flow rate.Conclusion: Progressive values of aspiration and/or cut rate increase the vitreous flow rate, independently of the DC. the DC control also has an important effect on the vitreous flow, but this effect was reduced at high cut rates because of convergence of the DC modes. RETINA 33: 933-938, 2013
Keywords vitrectomy
duty cycle
cut rate
aspiration
Language English
Sponsor National Eye Institute
Research to Prevent Blindness
Eye Concepts Laboratory at the Doheny Eye Institute
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Grant number National Eye Institute: EY03040
CAPES: BEX 2326-11-6
Date 2013-05-01
Published in Retina-the Journal of Retinal and Vitreous Diseases. Philadelphia: Lippincott Williams & Wilkins, v. 33, n. 5, p. 933-938, 2013.
ISSN 0275-004X (Sherpa/Romeo, impact factor)
Publisher Lippincott Williams & Wilkins
Extent 933-938
Origin http://dx.doi.org/10.1097/IAE.0b013e3182733f38
Access rights Closed access
Type Article
Web of Science ID WOS:000318011100006
URI http://repositorio.unifesp.br/handle/11600/36316

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