The heat-pipe resembling action of boiling bubbles in endovenous laser ablation
Mon, 2010-07-19 19:46 — Guest
Abstract
Endovenous laser ablation (EVLA) produces boiling bubbles emerging from pores within the hot fiber tip and traveling over
a distal length of about 20 mm before condensing. This evaporation-condensation mechanism makes the vein act like a heat pipe,
where very efficient heat transport maintains a constant temperature, the saturation temperature of 100°C, over the volume
where these non-condensing bubbles exist. During EVLA the above-mentioned observations indicate that a venous cylindrical
volume with a length of about 20 mm is kept at 100°C. Pullback velocities of a few mm/s then cause at least the upper part
of the treated vein wall to remain close to 100°C for a time sufficient to cause irreversible injury. In conclusion, we propose
that the mechanism of action of boiling bubbles during EVLA is an efficient heat-pipe resembling way of heating of the vein
wall.
a distal length of about 20 mm before condensing. This evaporation-condensation mechanism makes the vein act like a heat pipe,
where very efficient heat transport maintains a constant temperature, the saturation temperature of 100°C, over the volume
where these non-condensing bubbles exist. During EVLA the above-mentioned observations indicate that a venous cylindrical
volume with a length of about 20 mm is kept at 100°C. Pullback velocities of a few mm/s then cause at least the upper part
of the treated vein wall to remain close to 100°C for a time sufficient to cause irreversible injury. In conclusion, we propose
that the mechanism of action of boiling bubbles during EVLA is an efficient heat-pipe resembling way of heating of the vein
wall.
- Content Type Journal Article
- Category Brief Report
- DOI 10.1007/s10103-010-0780-2
- Authors
- Cees W. M. van der Geld, Eindhoven University of Technology Department of Mechanical Engineering Eindhoven The Netherlands
- Renate R. van den Bos, Erasmus University Medical Center Department of Dermatology Rotterdam The Netherlands
- Peter W. M. van Ruijven, Eindhoven University of Technology Department of Mechanical Engineering Eindhoven The Netherlands
- Tamar Nijsten, Erasmus University Medical Center Department of Dermatology Rotterdam The Netherlands
- H. A. Martino Neumann, Erasmus University Medical Center Department of Dermatology Rotterdam The Netherlands
- Martin J. C. van Gemert, University of Amsterdam Department of Biomedical Engineering and Physics, Academic Medical Center Amsterdam The Netherlands
- Journal Lasers in Medical Science
- Online ISSN 1435-604X
- Print ISSN 0268-8921
Comments
Post new comment