Torsional power study using CENTURION phacoemulsification technology

Jensen, Jerry L.; Shi, Dallas; Robinson, M. S.; Kramer, Gregory D.; Zaugg, Brian; Pettey, Jeff H.; Barlow, William R.; Olson, Randall J.

doi:10.1111/ceo.12748

Cited by 23 publications

(20 citation statements)

References 9 publications

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“…Identifying the most efficient power setting can potentially reduce the unnecessary risk of damage, which is the purpose of this study. Our previous work has identified ideal settings and parameters for quadrant or small particle removal after grooving 3–6. This study is the second in a series seeking to identify optimal settings during the grooving step.…”

Section: Discussionmentioning

confidence: 99%

“…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%

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<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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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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

Thomson

Bird

Stutz

et al. 2019

OPTH

Self Cite

View full text Add to dashboard Cite

show abstract

“…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%

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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“…The same energy and fluid settings were used in all groups. The torsional conventional phaco mode with maximum 60% amplitude was selected for the torsional mode . The vacuum threshold was 98% of the maximum vacuum, and the pulse rate was 30 pulse per second.…”

Section: Methodsmentioning

confidence: 99%

“…The torsional conventional phaco mode with maximum 60% amplitude was selected for the torsional mode. 19 The vacuum threshold was 98% of the maximum vacuum, and the pulse rate was 30 pulse per second. The maximum vacuum was 330 mmHg, the aspiration was 38 mL/min for I/A phaco and the intraocular pressure was kept at 30 mmHg.…”

Section: Surgery Techniquementioning

confidence: 99%