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Updated: Jan 22, 2026

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Continuous cooling system in conjunction with laser surgery for ear reshaping.

Yen-Chang Hsiao1, Kuen Ting2, Yun-Liang Su3

  • 1Department of Plastic Surgery, Chang Gung Memorial Hospital, Chang Gung University, Taipei, 10507, Republic of China.

Lasers in Medical Science
|July 2, 2019
PubMed
Summary

Laser reshaping of prominent ears uses CO2 laser and cryogen spray cooling (CSC) to stabilize cartilage. While early complications like swelling occurred, all patients achieved excellent long-term results, showing laser otoplasty

Keywords:
Cryogen spray coolingLaser reshapingRabbit earThermal injury

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Area of Science:

  • Biomedical Engineering
  • Plastic Surgery
  • Laser Medicine

Background:

  • Reshaping ear cartilage often results in stress-induced return to the original configuration.
  • Laser irradiation can induce stress relaxation in cartilage, leading to stable configurations.

Purpose of the Study:

  • To evaluate the efficacy and safety of CO2 laser reshaping with continuous cryogen spray cooling (CSC) for prominent ear correction (otoplasty).
  • To assess the long-term outcomes and complications associated with laser-assisted otoplasty.

Main Methods:

  • Ex vivo studies involved reshaping rabbit auricles using CO2 laser and CSC.
  • Clinical evaluation of 50 patients (100 ears) who underwent laser otoplasty between 2006 and 2016.
  • Continuous cooling (4°C) with a CO2 laser was applied during retroauricular incision for cartilage reshaping.

Main Results:

  • Ex vivo studies demonstrated cartilage bending correlated with CSC parameters.
  • 100% of patients experienced early complications (≤1 month), primarily swelling (100%), with lower rates of ecchymosis (5%), hematoma (2%), scarring (2%), infection (1%), undercorrection (1%), overcorrection (1%), and relapse (1%).
  • All complications resolved or were corrected within 3 months, with good to excellent outcomes reported at >6 months post-surgery.

Conclusions:

  • CO2 laser reshaping with CSC is a viable technique for ear cartilage modification.
  • Careful control of laser parameters (wavelength, energy) and tissue properties is crucial for successful laser ear reshaping.
  • Laser-assisted otoplasty demonstrates potential for stable and aesthetically pleasing correction of prominent ears with manageable early complications.