Pulsed infrared laser ablation rates and characteristics in otic capsule

Wong, Brian J. F.; Neev, Joseph; Sung, Vivian W.; Simonian, Belinda; Cheung, Eric; Berns, Michael W.

doi:10.1117/12.209112

Cited by 4 publications

(1 citation statement)

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“…Preliminary investigations on the ablation process in porcine otic capsule and cortical bone have revealed some startling findings. Otic capsular tissue under physiological conditions (wet) ablates with relatively consistent ablation pattern (15) with limited episodes of 'stalled out' ablation. The "stalling out' phenomena is where ablation begins but ceases despite continued irradiation (16); the mechanism of action is thought to be a combination of total tissue desiccation (17) and possibly surface modification of the tissue.…”

Section: Introductionmentioning

confidence: 99%

Scanning electron microscopy of otic capsule and calvarial bone ablated by a holmium-YAG laser

et al. 1994

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Abstract. Scanning electron microscopy (SEM) was performed oll holmium-YAG laser ablated bone in order to study the surface morphology of the ablation crater. An otosurgical bone model of porcine otic capsule and calvarial cortical bone was used. Otic capsule bone is dense and homogeneous whereas cortical bone is porous. Both bone tissues were studied under fresh and dehydrated conditions to investigate the role of water in the ablation process. Laser irradiation time was varied from 5 to 60s. Laser flux was 85mJ pulse-~ at 4-Hz pulse repetition rate. Globular spheroids of melted bone material were noted in both wet and dried specimens for both tissues. Several of these globules ruptured yielding an SEM image which suggests a violent ejection process. SEMs of dry cortical bone demonstrated the presence of fibres which reflect the selective removal of inorganic surface bone constituents with preservation of subsurface residual collagen fibres. The ablation crater walls in wet tissues appear rougher and possibly reflect a more violent ablation process due to water vaporization causing expulsion of bone material. In contrast, the crater walls in dry tissue appear smoother.

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Section: Introductionmentioning

confidence: 99%

Scanning electron microscopy of otic capsule and calvarial bone ablated by a holmium-YAG laser

et al. 1994

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Measurement of Acoustic Transients During Pulsed Holmium:YAG Laser Ablation of Cadaveric Human Temporal Bone

Wong

Gibbs

Neev³

et al. 2000

Lasers Med Sci

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Pulsed infrared (IR) and ultraviolet (UV) lasers have been suggested for use in middle ear surgery due to potential fiberoptic delivery, decreased thermal trauma and precise ablation characteristics. Although attention has been focused on the thermal and photoacoustic events that occur during pulsed laser ablation of hard tissue, there are few studies which evaluate the acoustic energy generated from these devices from an audiological standpoint. In this study, the mastoid cavities of cadaveric human temporal bones were irradiated with a holmium: yttrium aluminium garnet (Ho:YAG) laser (λ=2.12 µm) using the following parameters: 5, 10, and 15 Hz pulse repetition rate and 1, 2, 4, 6, 8, and 10 W average power. During ablation, acoustic measurements were made using a sound level meter positioned 5 cm away from the target site. With each set of laser parameters, the sound intensity exceeded 85 dB (dBA scale). Peak intensities of 125 dB were measured, and a saturation effect noted above 4 W or 500 mJ/pulse. The clinical significance of these findings is discussed and the acoustical aspects of middle ear function and noise trauma are reviewed.

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Photothermal-induced temperature changes in a model inner ear: a comparison of visible, infrared, and ultraviolet lasers

Wong

Lee

Dickinson

et al. 1996

IEEE J. Select. Topics Quantum Electron.

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Pulsed infrared laser ablation rates and characteristics in otic capsule

Cited by 4 publications

References 0 publications

Scanning electron microscopy of otic capsule and calvarial bone ablated by a holmium-YAG laser

Scanning electron microscopy of otic capsule and calvarial bone ablated by a holmium-YAG laser

Measurement of Acoustic Transients During Pulsed Holmium:YAG Laser Ablation of Cadaveric Human Temporal Bone

Photothermal-induced temperature changes in a model inner ear: a comparison of visible, infrared, and ultraviolet lasers

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