Vitreous flow rates through dual pneumatic cutters: effects of duty cycle and cut rate

Dina Joy K Abulon Medical Affairs, Alcon Research, Ltd, Lake Forest, CA, USA Purpose: We aimed to investigate effects of instrument settings on porcine vitreous flow rates through dual pneumatic high-speed vitrectomy probes. Methods: The CONSTELLATION® Vision System was tested with 250,...

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Autor principal:	Abulon DJK
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2015
Materias:	Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/1c876a21cafa4563be5549c088892db6
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spelling	oai:doaj.org-article:1c876a21cafa4563be5549c088892db62021-12-02T06:19:58ZVitreous flow rates through dual pneumatic cutters: effects of duty cycle and cut rate1177-5483https://doaj.org/article/1c876a21cafa4563be5549c088892db62015-02-01T00:00:00Zhttp://www.dovepress.com/vitreous-flow-rates-through-dual-pneumatic-cutters-effects-of-duty-cyc-peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483 Dina Joy K Abulon Medical Affairs, Alcon Research, Ltd, Lake Forest, CA, USA Purpose: We aimed to investigate effects of instrument settings on porcine vitreous flow rates through dual pneumatic high-speed vitrectomy probes. Methods: The CONSTELLATION® Vision System was tested with 250, 450, and 650 mmHg of vacuum using six ULTRAVIT® vitrectomy probes of each diameter (25+®, 25, 23, and 20 gauge) operated from 500 cuts per minute (cpm) up to 5,000 cpm. Duty cycle modes tested included biased open, 50/50, and biased closed. Flow rates were calculated by assessing the change in weight of porcine eyes during vitreous aspiration. Volumetric flow rate was measured with a computer-connected electronic scale. Results: At lower cut rates, the biased open mode produced higher flow than did the 50/50 mode, which produced higher flow than did the biased closed mode. In the biased closed and 50/50 modes, vitreous flow rates tended to increase with increasing cut rate. Vitreous flow rates in the biased open duty cycle mode remained relatively constant across cut rates. Conclusion: Vitreous flow rates through dual pneumatic vitrectomy probes could be manipulated by changing the duty cycle modes on the vitrectomy system. Differences in duty cycle behavior suggest that high-speed cut rates of 5,000 cpm may optimize vitreous aspiration. Keywords: enhanced 25-gauge vitrectomy, 25-gauge vitrectomy, 20-gauge vitrectomy, 23-gauge vitrectomy, aspiration, Constellation Vision SystemAbulon DJKDove Medical PressarticleOphthalmologyRE1-994ENClinical Ophthalmology, Vol 2015, Iss default, Pp 253-261 (2015)
institution	DOAJ
collection	DOAJ
language	EN
topic	Ophthalmology RE1-994
spellingShingle	Ophthalmology RE1-994 Abulon DJK Vitreous flow rates through dual pneumatic cutters: effects of duty cycle and cut rate
description	Dina Joy K Abulon Medical Affairs, Alcon Research, Ltd, Lake Forest, CA, USA Purpose: We aimed to investigate effects of instrument settings on porcine vitreous flow rates through dual pneumatic high-speed vitrectomy probes. Methods: The CONSTELLATION® Vision System was tested with 250, 450, and 650 mmHg of vacuum using six ULTRAVIT® vitrectomy probes of each diameter (25+®, 25, 23, and 20 gauge) operated from 500 cuts per minute (cpm) up to 5,000 cpm. Duty cycle modes tested included biased open, 50/50, and biased closed. Flow rates were calculated by assessing the change in weight of porcine eyes during vitreous aspiration. Volumetric flow rate was measured with a computer-connected electronic scale. Results: At lower cut rates, the biased open mode produced higher flow than did the 50/50 mode, which produced higher flow than did the biased closed mode. In the biased closed and 50/50 modes, vitreous flow rates tended to increase with increasing cut rate. Vitreous flow rates in the biased open duty cycle mode remained relatively constant across cut rates. Conclusion: Vitreous flow rates through dual pneumatic vitrectomy probes could be manipulated by changing the duty cycle modes on the vitrectomy system. Differences in duty cycle behavior suggest that high-speed cut rates of 5,000 cpm may optimize vitreous aspiration. Keywords: enhanced 25-gauge vitrectomy, 25-gauge vitrectomy, 20-gauge vitrectomy, 23-gauge vitrectomy, aspiration, Constellation Vision System
format	article
author	Abulon DJK
author_facet	Abulon DJK
author_sort	Abulon DJK
title	Vitreous flow rates through dual pneumatic cutters: effects of duty cycle and cut rate
title_short	Vitreous flow rates through dual pneumatic cutters: effects of duty cycle and cut rate
title_full	Vitreous flow rates through dual pneumatic cutters: effects of duty cycle and cut rate
title_fullStr	Vitreous flow rates through dual pneumatic cutters: effects of duty cycle and cut rate
title_full_unstemmed	Vitreous flow rates through dual pneumatic cutters: effects of duty cycle and cut rate
title_sort	vitreous flow rates through dual pneumatic cutters: effects of duty cycle and cut rate
publisher	Dove Medical Press
publishDate	2015
url	https://doaj.org/article/1c876a21cafa4563be5549c088892db6
work_keys_str_mv	AT abulondjk vitreousflowratesthroughdualpneumaticcutterseffectsofdutycycleandcutrate
_version_	1718399920395780096

Vitreous flow rates through dual pneumatic cutters: effects of duty cycle and cut rate

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