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J. Zacharias; Dynamic and Static Properties of a High Speed Piezoelectric Vitrectomy Handpiece . Invest. Ophthalmol. Vis. Sci. 2006;47(13):4673.
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© ARVO (1962-2015); The Authors (2016-present)
To develop a novel vitrectomy handpiece mechanism with improved characteristics such as extended cut rate, high sideport open–to–closed ratio, coexisting repetitive and proportional modes of operation and console adjustable sideport dimensions.
Stacked elliptical leveraged piezoelectric actuators were used to build a fully operating prototype together with the controlling electronics. The system was operated in non–resonant and resonant modes, using open and closed loop architectures, and noise canceling approaches.
An electrically operable reusable vitrectomy handpiece prototype was constructed. The vitrectomy handpiece of the present study performed with improved characteristics. Cut rate could be raised up to 3000 cuts per minute in non–resonant mode, and 5000 cuts per minute in resonant mode. Sideport open–to–closed ratio could be kept up to 50% at maximum operable cut rates. The system could be operated in DC mode to provide a proportional mode of operation suitable for controlled single cuts, as well as scissors and forceps operation. Noise and vibration were kept at a minimum.
A new modality for constructing and operating a vitrectomy handpiece is presented. Performance of this handpiece compares with several advantages with currently existing pneumatic and electrically operated vitrectomy handpieces. According to the results of this study and to other considerations such as costs and durability may determine introduction of this type of vitrectomy handpiece in the vitrectomy consoles of the future.
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