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International Ophthalmology

, Volume 39, Issue 9, pp 2015–2021 | Cite as

Investigation of scleral thermal injuries caused by ultrasonic pars plana phacoemulsification and aspiration using pig eyes

  • Takaki Sato
  • Toru Yasuhara
  • Masanori Fukumoto
  • Masashi Mimura
  • Takatoshi Kobayashi
  • Teruyo Kida
  • Shota Kojima
  • Hidehiro Oku
  • Tsunehiko IkedaEmail author
Original Paper
  • 64 Downloads

Abstract

Purpose

The purpose of this study was to investigate the thermal injuries caused by ultrasonic pars plana phacoemulsification and aspiration (PPPEA) using pig eyes.

Method

Using a 20-gauge (G) vitrectomy system (Accurus®, Fragmatome; Alcon Laboratories) in both the ‘open-tip’ and ‘closed-tip’ techniques, PPPEA was performed in pig eyes and the subsequent thermal injuries generated around the scleral wound were measured by infrared thermal imaging (thermography). Post surgery, the state of the scleral wound was observed under a microscope, and a tissue slice containing the scleral wound was then prepared and observed under an optical microscope.

Results

Thermography measurements revealed a slight temperature rise around the scleral wound in the open-tip case, yet a marked temperature rise in the closed-tip case. The scleral wound incision produced by the open tip was linear, while that produced by the closed tip was expanded. Histological examination revealed mild degeneration of the sclera around the wound in the open-tip case, yet marked tissue degeneration by thermal injuries in the closed-tip case.

Conclusion

Our findings showed that in PPPEA, the temperature of the tip of a 20G vitrectomy system rapidly increases due to the closed-tip technique, thus producing obvious thermal damage to the scleral wound. In order to prevent thermal injuries to the scleral wound during PPPEA, it is important to shorten the time of ultrasonic oscillation during surgery as much as possible while the tip is occluded with nuclear fragments.

Keywords

Thermal injury Ultrasonic pars plana phacoemulsification and aspiration (PPPEA) Infrared thermal imaging Scleral wound Histological examination 

Notes

Acknowledgements

The authors wish to thank John Bush for editing the manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have conflicts of interest.

Ethical approval

This article does not contain any studies with human participants and animals performed by any of the authors.

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  • Takaki Sato
    • 1
  • Toru Yasuhara
    • 2
  • Masanori Fukumoto
    • 1
  • Masashi Mimura
    • 1
  • Takatoshi Kobayashi
    • 1
  • Teruyo Kida
    • 1
  • Shota Kojima
    • 1
  • Hidehiro Oku
    • 1
  • Tsunehiko Ikeda
    • 1
    Email author
  1. 1.Department of OphthalmologyOsaka Medical CollegeTakatsuki-CityJapan
  2. 2.Yasuhara Eye ClinicTakashima-CityJapan

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