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Explosive onset of continuous wave laser tissue ablation.

R M Verdaasdonk1, C Borst, M J van Gemert

  • 1Department of Cardiology, University Hospital, Utrecht, The Netherlands.

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Summary

Continuous wave laser ablation of bovine tissues reveals three distinct phases: denaturation, explosive vaporization, and cyclic carbonization. These findings necessitate updates to current laser tissue ablation models.

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Area of Science:

  • Biomedical Engineering
  • Laser Physics
  • Materials Science

Background:

  • Understanding laser-tissue interaction is crucial for medical applications.
  • Continuous wave (CW) lasers are used in tissue ablation procedures.
  • Existing models may not fully capture dynamic ablation phenomena.

Purpose of the Study:

  • To investigate the phenomena during continuous wave laser tissue ablation.
  • To characterize the phases of ablation in bovine aortic and myocardial tissues.
  • To provide data for refining laser ablation models.

Main Methods:

  • Exposure of bovine tissues to Nd-YAG and argon CW laser light in air and water.
  • Measurement of transmitted light.
  • Surface imaging and histological analysis of ablated tissues.

Main Results:

  • Observed three distinct ablation phases: denaturation, explosive vaporization ('popcorn'), and cyclic carbonization.
  • Phase B ('popcorn') correlated with a 50% drop in light transmission.
  • Phase C showed cyclic carbonization and crater formation with constant ablation velocity.
  • Evidence of a significant temperature gradient at the ablation front.

Conclusions:

  • Laser tissue ablation involves complex dynamic processes including explosive vaporization and cyclic carbonization.
  • Current models require enhancement to incorporate these observed phenomena.
  • Ablation velocity is constant and tissue-dependent, influenced by thermal gradients.