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Proceedings Paper

Ultrashort pulse laser interactions with cortical bone tissue for applications in orthopaedic surgery
Author(s): Simon A. Ashforth; M. Cather Simpson; Owen Bodley; Reece Oosterbeek
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Paper Abstract

Using a femtosecond pulsed laser system (pulse width = 100fs, repetition rate = 1kHz, λ = 800nm), ablation threshold studies of freshly culled bovine and ovine cortical bone samples were identified using the diameter regression technique. Using the D2 technique, the ablation threshold was found to lie within a range of 0.83 - 0.96 Jcm−2 and 0.89 - 0.95 Jcm−2 for ovine and bovine cortical bone respectively indicating that laser ablation of bone is irrespective of target species.

The relationship between cortical bone tissue removal and the number of applied pulses was explored. By altering the laser spot translation rate, we varied the number of pulses at each point along scribed linear cuts. Optical Coherence Tomography (OCT) and PDMS casting indicates that cut depth is linearly dependent on the number of pulses applied to the tissue, irrespective of donor species. For single pulse ablation of ovine and bovine cortical bone, we determined that the ablation rates were 0.41 - 0.75 μm per pulse and 0.28 - 0.90 μm per pulse when pulses of fluences in the range 0.52 - 2.63 Jcm−2 were applied to ovine and bovine cortical bone tissue, respectively. Structural analysis of the ablation features using environmental scanning electron microscopy and optical microscopy were utilized to assess the ablation features and identify signs of damage to surrounding tissue. We observed no structural indications of thermal shockwave cracking, molten debris deposition or charring of the tissue whilst leaving hydroxyapatite crystal structure intact.

Paper Details

Date Published: 15 April 2015
PDF: 9 pages
Proc. SPIE 9355, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XV, 935508 (15 April 2015); doi: 10.1117/12.2080078
Show Author Affiliations
Simon A. Ashforth, The Univ. of Auckland (New Zealand)
MacDiarmid Institute for Advanced Materials and Nanotechonolgies (New Zealand)
Dodd Walls Ctr. for Photonics and Quatum Technologies (New Zealand)
M. Cather Simpson, The Univ. of Auckland (New Zealand)
MacDiarmid Institute for Advanced Materials and Nanotechnology (New Zealand)
Dodd Walls Ctr. for Photonics and Quatum Technologies (New Zealand)
Owen Bodley, The Univ. of Auckland (New Zealand)
MacDiarmid Institute for Advanced Materials and Nanotechnologies (New Zealand)
Dodd Walls Ctr. for Photonics and Quatum Technologies (New Zealand)
Reece Oosterbeek, The Univ. of Auckland (New Zealand)
MacDiarmid Institute for Advanced Materials and Nanotechology (New Zealand)
Dodd Walls Ctr. for Photonics and Quatum Technologies (New Zealand)


Published in SPIE Proceedings Vol. 9355:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XV
Alexander Heisterkamp; Peter R. Herman; Michel Meunier; Stefan Nolte, Editor(s)

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