Porcine lens nuclei as a model for comparison of 3 ultrasound modalities regarding efficiency and chatter

Oakey, Zack; Jensen, Jerry L.; Zaugg, Brian; Radmall, Bryce; Pettey, Jeff H.; Olson, Randall J.

doi:10.1016/j.jcrs.2013.01.049

Cited by 51 publications

(62 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The result of using formalin, and the time interval and methods described above, yield porcine lenses comparable to hard cataractous human lenses (3-4+). Oakey et al [3] have validated this previously for comparability of both density and behavior to human lenses during phaco.…”

Section: Methodsmentioning

confidence: 86%

“…porcinus lenses were used for this trial, using a model which has been previously described [3]. Pig eyes were purchased directly from a supplier (Visiontech Inc, Sunnyvale, TX, USA) and lenses were dissected away and isolated within 48 hours of arrival to the laboratory.…”

Section: Methodsmentioning

confidence: 99%

“…Chatter was defined as an event where the lens or remaining fragment was seen to bounce or repulse off the phaco tip. These parameters were measured and recorded in a manner that has been described by Oakey et al [3].…”

Section: Methodsmentioning

confidence: 99%

“…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%

See 3 more Smart Citations

The impact of tip bevel angulation on phacoemulsification efficiency and chatter

Gupta¹,

Cahoon²,

Shi³

et al. 2017

New Front Ophthalmol

View full text Add to dashboard Cite

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.

show abstract

Section: Methodsmentioning

confidence: 86%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The impact of tip bevel angulation on phacoemulsification efficiency and chatter

Gupta¹,

Cahoon²,

Shi³

et al. 2017

New Front Ophthalmol

View full text Add to dashboard Cite

show abstract

“…In order to objectively differentiate between the available options, we developed a porcine lens model. In the laboratory, when prepared properly, porcine lens fragments mimic human cataract lens hardness [5].…”

Section: Introductionmentioning

confidence: 99%

A Comparison of Porcine Lens Storage Methods for Optimal Phacoemulsification

Christensen¹,

Vegunta²

2016

J Clin Exp Ophthalmol

View full text Add to dashboard Cite

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.

show abstract

A novel method to compare phacoemulsification parameters in vivo: two halves of one nucleus

Tomilova

Shukhaev

2016

Graefes Arch Clin Exp Ophthalmol

View full text Add to dashboard Cite

show abstract

Porcine lens nuclei as a model for comparison of 3 ultrasound modalities regarding efficiency and chatter

Abstract: Animal lenses soaked for 2 hours in formalin were most comparable to human lenses. Longitudinal US may be an acceptable alternative to torsional and transversal US.

Cited by 51 publications

References 8 publications

The impact of tip bevel angulation on phacoemulsification efficiency and chatter

The impact of tip bevel angulation on phacoemulsification efficiency and chatter

A Comparison of Porcine Lens Storage Methods for Optimal Phacoemulsification

A novel method to compare phacoemulsification parameters in vivo: two halves of one nucleus

Contact Info

Product

Resources

About