Gupta Isha, Cahoon Judd M, Gardiner Gareth, Garff Kevin, Henriksen Bradley S, Pettey Jeff H, Barlow William R, Olson Randall J
From the Department of Ophthalmology and Visual Sciences, John A. Moran Eye Center, University of Utah, Salt Lake City, Utah, USA.
From the Department of Ophthalmology and Visual Sciences, John A. Moran Eye Center, University of Utah, Salt Lake City, Utah, USA.
J Cataract Refract Surg. 2015 Apr;41(4):836-41. doi: 10.1016/j.jcrs.2014.09.035. Epub 2015 Mar 4.
To evaluate the effect of vacuum and aspiration rates on phacoemulsification efficiency.
John A. Moran Eye Center Laboratories, University of Utah, Salt Lake City, Utah, USA.
Experimental study.
Formalin-soaked porcine lenses were divided into 2.0 mm cubes, and 0.9 mm 30-degree beveled 20-degree bent tips were used with micropulse ultrasound (US) (6 milliseconds on and 6 milliseconds off) and a peristaltic flow system. Vacuum levels were tested at 200, 300, 400, and 500 mm Hg, and aspiration rates were tested at 20, 35, and 50 mL/min. Efficiency (time to lens removal) and chatter (number of lens fragment repulsions from the tip) were determined.
Increasing vacuum increased efficiency only when going from 200 mm Hg to higher vacuum levels. Increasing aspiration increased efficiency at all points measured (25 mL/min versus 35 mL/min, P < .0001; 35 mL/min versus 50 mL/min, P = .012; 25 mL/min versus 50 mL/min, P < .0001). Chatter was highest at 200 mm Hg and decreased when vacuum was increased from 200 mm Hg to 300 mm Hg and up. Chatter decreased with increasing flow.
Vacuum improved efficiency only up to 300 mm Hg and was more dependent on increasing flow. Similarly, chatter correlated with 200 mm Hg vacuum only and was more correlated with flow. Limitations of this study include use of only 1 US power modulation and hard nuclear material.
No author has a financial or proprietary interest in any material or method mentioned.
评估真空度和抽吸速率对超声乳化效率的影响。
美国犹他州盐湖城犹他大学约翰·A·莫兰眼科中心实验室。
实验研究。
将用福尔马林浸泡过的猪晶状体切成2.0毫米的立方体，使用0.9毫米、30度斜面、20度弯曲的尖端，结合微脉冲超声（超声开启6毫秒，关闭6毫秒）和蠕动流系统。测试了200、300、400和500毫米汞柱的真空度，以及20、35和50毫升/分钟的抽吸速率。测定了效率（取出晶状体的时间）和震颤（晶状体碎片从尖端排斥的次数）。
仅当从200毫米汞柱提高到更高真空度时，增加真空度才会提高效率。在所有测量点，增加抽吸速率均提高了效率（25毫升/分钟与35毫升/分钟相比，P <.0001；35毫升/分钟与50毫升/分钟相比，P =.012；25毫升/分钟与50毫升/分钟相比，P <.0001）。震颤在200毫米汞柱时最高，当真空度从200毫米汞柱提高到300毫米汞柱及以上时震颤降低。震颤随流速增加而降低。
真空度仅在达到300毫米汞柱之前提高效率，且效率提高更依赖于增加流速。同样，震颤仅与200毫米汞柱的真空度相关，且与流速的相关性更强。本研究的局限性包括仅使用了1种超声功率调制方式以及硬核材料。
没有作者对文中提及的任何材料或方法拥有财务或专利权益。
