Objective comparison of 4 nonlongitudinal ultrasound modalities regarding efficiency and chatter

DeMill, David L; Zaugg, Brian; Pettey, Jeff H.; Jensen, Jerry L.; Jardine, Griffin J.; Wong, Gilbert; Olson, Randall J.

doi:10.1016/j.jcrs.2011.12.040

Cited by 51 publications

(38 citation statements)

References 7 publications

(5 reference statements)

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“…6 The lens cubes were then transferred into 1 container containing BSS. The lens cubes were washed 3 times with BSS and allowed to equilibrate in 10 mL BSS overnight at room temperature.…”

Section: This Was An Experimental Study Involving Laboratory Researchmentioning

confidence: 99%

Determining Optimal Torsional Ultrasound Power for Cataract Surgery With Automatic Longitudinal Pulses at Maximum Vacuum Ex Vivo

Ronquillo

Zaugg

Kirk

et al. 2014

American Journal of Ophthalmology

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“…6 The lens cubes were then transferred into 1 container containing BSS. The lens cubes were washed 3 times with BSS and allowed to equilibrate in 10 mL BSS overnight at room temperature.…”

Section: This Was An Experimental Study Involving Laboratory Researchmentioning

confidence: 99%

Determining Optimal Torsional Ultrasound Power for Cataract Surgery With Automatic Longitudinal Pulses at Maximum Vacuum Ex Vivo

Ronquillo

Zaugg

Kirk

et al. 2014

American Journal of Ophthalmology

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“…Our group has created original laboratory methods using brunescent human nuclei from Tanzanian patients in order to further investigate and optimize such technology [6]. These lenses were 3+ to 4+ in hardness, and thus are suitable for testing efficiency.…”

Section: Discussionmentioning

confidence: 99%

“…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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“…Theoretically, different angles impact surface area available for cataract engagement, ultrasound modality choice, time to occlusion and risk of capsular breakage [1]. DeMill et al [2] and Oakey et al [3] have shown that even small adjustments in these parameters can lead to drastic changes in both efficiency and chatter during lens removal; however, evidence for bevel tip angulation and its impact on efficiency and chatter is lacking. Furthermore, when choosing bevel angle, surgeons are often guided principally by personal preference, others by their opinions and training.…”

Section: Introductionmentioning

confidence: 99%

The impact of tip bevel angulation on phacoemulsification efficiency and chatter

Gupta¹,

Cahoon²,

Shi³

et al. 2017

New Front Ophthalmol

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Primary objective: To evaluate the effect of tip bevel angulation on phacoemulsification efficiency and chatter. Research design:In vitro laboratory study. Methods and procedures:Formalin-soaked porcine lenses were divided into 2 mm cubes. 0.9 mm straight 0, 15, 30, 45 beveled degree tips were used with micropulse ultrasound (6 ms on and 6 ms off ). Power was set at 100%, vacuum levels were set at 500 mmHg; and aspiration rates were set at 50 mL/min. Efficiency (time to lens removal) and chatter (number of lens fragment repulsions from the tip) were determined. Main outcomes and results:Changing the bevel angulation on a straight 0.9 mm phacoemulsification tip had no significant effect on efficiency. A 45 degree bevel was the most efficient tip overall. Chatter was seen to be significantly higher with a 15 degree tip (ANOVA, P=.0046). Conclusions:Tip bevel angulation has little effect on phacoemulsification efficiency and chatter, especially when optimized parameters are used. Limitations of this study include use of only one ultrasound power modulation and hard nuclear material.

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Objective comparison of 4 nonlongitudinal ultrasound modalities regarding efficiency and chatter

Cited by 51 publications

References 7 publications

Determining Optimal Torsional Ultrasound Power for Cataract Surgery With Automatic Longitudinal Pulses at Maximum Vacuum Ex Vivo

Determining Optimal Torsional Ultrasound Power for Cataract Surgery With Automatic Longitudinal Pulses at Maximum Vacuum Ex Vivo

A Comparison of Porcine Lens Storage Methods for Optimal Phacoemulsification

The impact of tip bevel angulation on phacoemulsification efficiency and chatter

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