Comparison of a torsional and a standard tip with a monitored forced infusion phacoemulsification system

Boulter, Tyler D.; Jensen, Jerry L.; Christensen, Michael D.; Lambert, Nathan G.; Zaugg, Brian; Pettey, Jeff H.; Olson, Randall J.

doi:10.1016/j.jcrs.2015.11.048

Cited by 16 publications

(8 citation statements)

References 6 publications

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“…Figure 1: Effect of time on efficiency using the humidity chamber method. While performing a recent study comparing the efficiency of two tips (Vegunta S, Christensen MD, Boulter T, Jensen JD, Olson RJ; unpublished data), our team observed efficiency times that were drastically different from previous work showing that a comparison of two tips typically yields similar efficiency times when the power setting is the same for both tips [12]. We thought the abnormal efficiency times may have been related to the duration of the experiment.…”

Section: Discussionmentioning

confidence: 64%

“…Another study showed that a 0.9 mm, 30-degree angled tip is most efficient when compared to similar 1.1 mm and 0.7 mm tips [8]. This is just a sampling of the many papers that have clarified clinical arguments about superiority in instrumentation definitively and for the first time [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Figure 1: Effect of time on efficiency using the humidity chamber method.…”

Section: Discussionmentioning

confidence: 99%

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A Comparison of Porcine Lens Storage Methods for Optimal Phacoemulsification

Christensen¹,

Vegunta²

2016

J Clin Exp Ophthalmol

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Objective: The study purpose was to compare effects of two porcine lens storage methods on phacoemulsification efficiency and chatter.Methods: This in vitro laboratory study was conducted at the John A. Moran Eye Center Laboratories, University of Utah. Porcine nuclei were fixed in 10% formaldehyde and cut into 2.0 mm cubes. An equal number of lens cubes either were stored in a 100% humidity chamber or were partially immersed in balanced salt solution (BSS). Using identical parameters on the phacoemulsification machine, 40 lenses that underwent each storage method were phacoemulsified every two hours for a total of ten hours.Results: Lenses stored in the 100% humidity chamber experienced a 2.25% increase in efficiency per hour (r 2 =0.1922; p=0.3846), while lenses stored partially immersed in BSS experienced a 1.30% increase in efficiency per hour (r 2 =0.4084; p=0.1719). Although we found no statistically significant difference between the two groups, the partially immersed lenses were consistently softer than the lenses that were kept in the 100% humidity chamber. Chatter was minimal throughout the testing, but showed an increase over time. Conclusion:Either the 100% humidity chamber or the partially submerged method can be used for lens storage. Despite some differences between the two storage methodologies, the differences were not statistically significant. We conclude that using either method results in a natural softening of the lenses over time which must be taken into consideration during future experiments. This necessitates the testing time to be as short as possible.

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Section: Discussionmentioning

confidence: 64%

Section: Discussionmentioning

confidence: 99%

A Comparison of Porcine Lens Storage Methods for Optimal Phacoemulsification

Christensen¹,

Vegunta²

2016

J Clin Exp Ophthalmol

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“…Efficiency times were averaged and the SDs were calculated. Previous studies1–3,5–17,19–22 considered all data points more than two SDs from the mean as outliers and removed them. Utilizing these same two SDs as cutoff was considered necessary for this study because research shows that outside of two SDs, data points likely represent very hard lenses that require more time to emulsify 28.…”

Section: Methodsmentioning

confidence: 99%

“…These settings include the aspiration flow rate, level of vacuum at the tip, and magnitude of ultrasound energy. A previous series of studies have determined the optimal settings for lens removal during the quadrant removal portions of the surgery 1–26. However, the optimal settings for the grooving step, the initial step of phaco, have not yet been elucidated.…”

Section: Introductionmentioning

confidence: 99%

<p>The effect of increasing power when grooving using phacoemulsification</p>

Thomson

Bird

Stutz

et al. 2019

OPTH

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Purpose To determine optimal power settings on the Centurion Vision System during the grooving step in cataract surgery. Methods Intact porcine lenses hardened by formalin and placed in a chamber designed to simulate the anterior chamber of the eye were used to test longitudinal power at 40%, 70%, and 100% and torsional power at 0%. Flow rate was set at 40 mL/min. Vacuum was set at 400 mmHg, intraocular pressure was set at 50 mmHg, and a balanced phacoemulsification tip with a 20 degree tip and a 30 degree bevel was used. Efficiency (time to groove the lens in half) was determined. Results Increasing longitudinal power from 40% to 70% increased efficiency by 28% ( P <0.05), and by 32% ( P <0.05) when increasing longitudinal power from 40% to 100%. There was no statistically significant increase in efficiency from 70% to 100%. Conclusion For the tested variables, a longitudinal power of 70% was determined to be most efficient during the grooving step of cataract surgery for equivalent 3–4+ nuclei. Further increases in power demonstrated no statistically significant improvement in efficiency.

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“…Durch die veränderte Flüssigkeitskontrolle und die Modifikation der Spitze des Phakoemulsifikationshandgriffs können die Phako-energie und die Turbulenzen in der Vorderkammer verringert werden [14]. Damit ist die Aufarbeitung des Linsenkerns schneller und weniger traumatisch durch Linsenfragmente, die bei der Aufarbeitung durch Turbulenzen eine mechanische Schädigung des Endothels verursachen.…”

Section: Diskussionunclassified

Effektivität und Sicherheit eines modifizierten Tipdesigns bei der torsionalen Phakoemulsifikation

Schmidt¹,

Hubich²,

Vetter³

et al. 2018

Klin Monatsbl Augenheilkd

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Compared to torsional phacoemulsification with a mini-flared Kelman Tip and gravity fluidics, torsional phacoemulsification with a modified tip design and active fluidics is 38% more effective regarding the cumulative dissipated energy. Endothelial cell loss occurs to a similar extend using both systems. The postoperative changes in cell size (polymegathism), number of hexagonal cells (pleomorphism) and corneal thickness (pachymetry) were similar among both systems. We conclude, that the intraoperative stress on the endothelium is equivalent with both systems used.

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Comparison of a torsional and a standard tip with a monitored forced infusion phacoemulsification system

Abstract: None of the authors has a financial or proprietary interest in any material or method mentioned.

Cited by 16 publications

References 6 publications

A Comparison of Porcine Lens Storage Methods for Optimal Phacoemulsification

A Comparison of Porcine Lens Storage Methods for Optimal Phacoemulsification

<p>The effect of increasing power when grooving using phacoemulsification</p>

Effektivität und Sicherheit eines modifizierten Tipdesigns bei der torsionalen Phakoemulsifikation

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