Laboratory assessment of thermal characteristics of three phacoemulsification tip designs operated using torsional ultrasound

Jaime Zacharias Phacodynamics Laboratory, Pasteur Ophthalmic Clinic, Santiago, Chile Purpose: Ultrasound activation of phacoemulsification (phaco) tips can create considerable thermal energy that may increase the risk of tissue damage during cataract surgery. The purpose of this study was to defin...

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Autor principal:	Zacharias J
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2016
Materias:	Aspiration bypass balanced tip cataract occlusion temperature thermal imaging Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/8c786a155cfa427fb2be6a1d5a7e5d42
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spelling	oai:doaj.org-article:8c786a155cfa427fb2be6a1d5a7e5d422021-12-02T01:02:53ZLaboratory assessment of thermal characteristics of three phacoemulsification tip designs operated using torsional ultrasound1177-5483https://doaj.org/article/8c786a155cfa427fb2be6a1d5a7e5d422016-06-01T00:00:00Zhttps://www.dovepress.com/laboratory-assessment-of-thermal-characteristics-of-three-phacoemulsif-peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483Jaime Zacharias Phacodynamics Laboratory, Pasteur Ophthalmic Clinic, Santiago, Chile Purpose: Ultrasound activation of phacoemulsification (phaco) tips can create considerable thermal energy that may increase the risk of tissue damage during cataract surgery. The purpose of this study was to define the thermal profiles of three phaco tip designs in simulated surgical conditions. Methods: In this laboratory investigation, sleeved phaco tips (mini-flared Kelman® tip with aspiration bypass port and Intrepid® Balanced Tip with aspiration bypass port, and MST A1 bent-mini phaco tip (without aspiration bypass) were tested using an ultrasonic phaco device operated in torsional mode at power levels of 50%, 75%, and 100% amplitude. An automated fixture applied a 30 g load to simulate compression against the incision site, leading to friction between the silicone sleeve and the titanium tip. Temperature was recorded by high rate infrared imaging under conditions of free flow and occlusion, which was simulated by clamping the aspiration line. Data were summarized using descriptive statistics. Results: Baseline temperatures of ~26°C were observed for all tips. During ultrasonic operation at 50%, 75%, and 100% amplitude, temperatures were lower for the mini-flared and balanced tips versus the bent-mini tip, both when load was applied and during occlusion. The bent-mini tip reached temperatures as high as 70°C during occlusion with load when operated at 100% amplitude, whereas the mini-flared tip remained <50°C, and the balanced tip remained <36°C in all test conditions. For the mini-flared and balanced tips, temperature increases during operation were not markedly different from free flow and no-load conditions when occlusion or frictional events were simulated. Conclusion: In all experiments for each tip design, increasing ultrasound power was associated with greater increases in tip temperature. Tip temperatures increased with applied load, but marked temperature increases during occlusion were observed only with the bent-mini tip. The balanced tip produced minimal thermal peaks in all tests. Keywords: aspiration bypass, balanced tip, cataract, occlusion, temperature, thermal imagingZacharias JDove Medical PressarticleAspiration bypassbalanced tipcataractocclusiontemperaturethermal imagingOphthalmologyRE1-994ENClinical Ophthalmology, Vol 2016, Iss Issue 1, Pp 1095-1101 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	Aspiration bypass balanced tip cataract occlusion temperature thermal imaging Ophthalmology RE1-994
spellingShingle	Aspiration bypass balanced tip cataract occlusion temperature thermal imaging Ophthalmology RE1-994 Zacharias J Laboratory assessment of thermal characteristics of three phacoemulsification tip designs operated using torsional ultrasound
description	Jaime Zacharias Phacodynamics Laboratory, Pasteur Ophthalmic Clinic, Santiago, Chile Purpose: Ultrasound activation of phacoemulsification (phaco) tips can create considerable thermal energy that may increase the risk of tissue damage during cataract surgery. The purpose of this study was to define the thermal profiles of three phaco tip designs in simulated surgical conditions. Methods: In this laboratory investigation, sleeved phaco tips (mini-flared Kelman® tip with aspiration bypass port and Intrepid® Balanced Tip with aspiration bypass port, and MST A1 bent-mini phaco tip (without aspiration bypass) were tested using an ultrasonic phaco device operated in torsional mode at power levels of 50%, 75%, and 100% amplitude. An automated fixture applied a 30 g load to simulate compression against the incision site, leading to friction between the silicone sleeve and the titanium tip. Temperature was recorded by high rate infrared imaging under conditions of free flow and occlusion, which was simulated by clamping the aspiration line. Data were summarized using descriptive statistics. Results: Baseline temperatures of ~26°C were observed for all tips. During ultrasonic operation at 50%, 75%, and 100% amplitude, temperatures were lower for the mini-flared and balanced tips versus the bent-mini tip, both when load was applied and during occlusion. The bent-mini tip reached temperatures as high as 70°C during occlusion with load when operated at 100% amplitude, whereas the mini-flared tip remained <50°C, and the balanced tip remained <36°C in all test conditions. For the mini-flared and balanced tips, temperature increases during operation were not markedly different from free flow and no-load conditions when occlusion or frictional events were simulated. Conclusion: In all experiments for each tip design, increasing ultrasound power was associated with greater increases in tip temperature. Tip temperatures increased with applied load, but marked temperature increases during occlusion were observed only with the bent-mini tip. The balanced tip produced minimal thermal peaks in all tests. Keywords: aspiration bypass, balanced tip, cataract, occlusion, temperature, thermal imaging
format	article
author	Zacharias J
author_facet	Zacharias J
author_sort	Zacharias J
title	Laboratory assessment of thermal characteristics of three phacoemulsification tip designs operated using torsional ultrasound
title_short	Laboratory assessment of thermal characteristics of three phacoemulsification tip designs operated using torsional ultrasound
title_full	Laboratory assessment of thermal characteristics of three phacoemulsification tip designs operated using torsional ultrasound
title_fullStr	Laboratory assessment of thermal characteristics of three phacoemulsification tip designs operated using torsional ultrasound
title_full_unstemmed	Laboratory assessment of thermal characteristics of three phacoemulsification tip designs operated using torsional ultrasound
title_sort	laboratory assessment of thermal characteristics of three phacoemulsification tip designs operated using torsional ultrasound
publisher	Dove Medical Press
publishDate	2016
url	https://doaj.org/article/8c786a155cfa427fb2be6a1d5a7e5d42
work_keys_str_mv	AT zachariasj laboratoryassessmentofthermalcharacteristicsofthreephacoemulsificationtipdesignsoperatedusingtorsionalultrasound
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Laboratory assessment of thermal characteristics of three phacoemulsification tip designs operated using torsional ultrasound

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