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Proceedings Paper

Ball-Tip Fibres For Laser Angioplasty: Comparison Of Wavelengths From A Pulsed Neodymium-Yag Laser.
Author(s): Jonathan A. Michaels; Frank W. Cross; Timothy J. Bowker; Stephen G. Bown
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Paper Abstract

A new ball-tip fibre optic device has been assessed for the purpose of laser angioplasty. A pulsed Neodymium-YAG laser producing 100 p.s pulses at a repetition rate of 10 Hz was used to ablate human cadaver arterial tissue using approximately 500 mJ per pulse at a wavelength of 1064 nm or 300 mJ at a wavelength of 1.3 μm. Both wavelengths are capable of ablating atheroma with little histological evidence of surrounding thermal damage. Crater depths of about 5 μm per Joule were produced using 1064 nm with normal tissue exposed under saline. Crater depth increases by about 50% when exposures are carried out under blood and when diseased arterial tissue is exposed the crater depth is almost doubled. Depth of ablation with a wavelength of 1.3 μm is 3 to 4 times greater than with 1064 nm for the same exposure and a similar increased response is seen for diseased tissue or in the presence of blood. Further experiments at 1064 nm have shown that the ball-tip device has advantages over bare fibre or sapphire tipped devices in the recanalisation of occluded femoral vessels in an artificial circulation.

Paper Details

Date Published: 15 June 1989
PDF: 8 pages
Proc. SPIE 1067, Optical Fibers in Medicine IV, (15 June 1989); doi: 10.1117/12.952121
Show Author Affiliations
Jonathan A. Michaels, The Rayne Institute (England)
Frank W. Cross, The Rayne Institute (England)
Timothy J. Bowker, The Rayne Institute (England)
Stephen G. Bown, The Rayne Institute (England)

Published in SPIE Proceedings Vol. 1067:
Optical Fibers in Medicine IV
Abraham Katzir, Editor(s)

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