Dr. Joel M. Teichman Profile

Dr. Joel M. Teichman

Professor at St Pauls Hospital

SPIE Involvement:

Author

Publications (20)

Proceedings Article | 13 March 2024 Presentation + Paper

Contribution of cavitation and photothermal effects in laser lithotripsy

Nitesh Katta, Katherine Lydia Sikorski, Joel Teichman, Thomas Milner

Proceedings Volume 12817, 128170K (2024) https://doi.org/10.1117/12.2689938

KEYWORDS: Cavitation, Laser ablation, Photothermal effect, Pulsed laser operation, Optical coherence tomography, Laser lithotripsy

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Recent studies suggest that cavitation effect following laser induced vapor bubble collapse is more dominant than the photothermal effect in stone ablation during laser lithotripsy. Our research aims to introduce an experimental study design that precisely measures each effect's contribution using gypsum phantom stones. To isolate the cavitation-only mechanism after the collapse of the laser-induced vapor bubble, a phantom stone was submerged in a dye solution. The dye solution absorbed all laser light, generating cavitation, with additional experiments confirming the absence of any photothermal effect when the dye was not used. The fiber was positioned both parallel to the stone surface and perpendicular at a 1mm distance, exposing it solely to cavitation. In another set of experiments, a phantom stone was submerged in water and 2μm light from a thulium yttrium aluminum garnet (Tm:YAG) laser was delivered via the same optical fiber positioned (this time) perpendicular to the stone surface. In this case, both optical absorption and cavitation effect from laser-induced vapor bubble collapses were observed but the measured pressure transients showed significantly lower peak pressures compared to the first set. In a final set of experiments, these conditions remained constant, except the fiber was positioned parallel to the stone surface, once again exposing it to only the cavitation from the collapse of the laser induced vapor bubble. Craters created by all methods were imaged using an optical coherence tomography (OCT) system. Measured volumes showed that stone ablation was dominated by photo-thermal, and not by cavitation from the vapor bubble collapse. In fact, in two of the three trials of stone experiments (n=5, each trial) that were subjected to cavitation-only, there was no observable ablation. One trial produced an average volume that was 50% smaller than the average resulting from a single photo-thermal-only case (p = 0.0022 < 0.05). Our results suggest that finetuning of lithotripsy procedures with focus on energy transmission to the stone can provide optimal results.

Proceedings Article | 2 March 2022 Paper

Increased ablation efficiency in hard and soft tissues using an annular beam

Jason King, Nitesh Katta, Joel M. Teichman, James Tunnell, Thomas Milner

Proceedings Volume 11958, 119580E (2022) https://doi.org/10.1117/12.2608952

KEYWORDS: Tissues, Laser ablation, Beam shaping, Natural surfaces, Kidney, Laser therapeutics, Tissue optics, Soft tissue optics, Optical coherence tomography, Modulation

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Proceedings Article | 14 March 2013 Paper

Laser lithotripsy retropulsion varies with stone mass

Michael Robinson, Joel M. Teichman

Proceedings Volume 8565, 85651B (2013) https://doi.org/10.1117/12.2007516

KEYWORDS: Laser lithotripsy, Energy efficiency, Bladder, Fiber lasers, Pulsed laser operation, Laser therapeutics, Photons, Optical fibers, Holmium, Calculus

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Proceedings Article | 9 February 2012 Paper

Effects of Holmium:YAG energy on BackStop anti-retropulsion polymer

Jinze Qiu, Joel Teichman, Bingqing Wang, Thomas Milner

Proceedings Volume 8207, 82071E (2012) https://doi.org/10.1117/12.903979

KEYWORDS: Polymers, Laser ablation, Metals, Pulsed laser operation, Solids, Optical fibers, Laser energy, Image processing, Laser lithotripsy, Laser therapeutics

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Proceedings Article | 9 February 2012 Paper

Prediction of calcium oxalate monohydrate stone composition during ureteroscopy

Reza Hamidizedah, Megan Melnyk, Joel M. Teichman

Proceedings Volume 8207, 82071F (2012) https://doi.org/10.1117/12.905675

KEYWORDS: Endoscopy, Calculi, Calculus, Calcium, Surgery, Pulsed laser operation, Statistical analysis, Laser therapeutics, Visualization, Laser lithotripsy

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Proceedings Article | 2 March 2010 Paper

Evaluation of six holmium:YAG optical fibers for ureteroscopy: What's new in 2009?

Bodo Knudsen, Joel M. Teichman

Proceedings Volume 7548, 75481H (2010) https://doi.org/10.1117/12.843713

KEYWORDS: Optical fibers, Laser therapeutics, Manufacturing, Endoscopes, Laser damage threshold, Connectors, Aluminum, Garnet, YAG lasers, Gold

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SPIE Journal Paper | 1 March 2010 Open Access

Femtosecond laser lithotripsy: feasibility and ablation mechanism

Jinze Qiu, Joel Teichman, Tianyi Wang, Joseph Neev, Randolph Glickman, Kin Foong Chan, Thomas Milner

JBO, Vol. 15, Issue 02, 028001, (March 2010) https://doi.org/10.1117/12.10.1117/1.3368998

KEYWORDS: Laser ablation, Femtosecond phenomena, Calculi, Plasma, Calculus, Laser lithotripsy, Pulsed laser operation, Laser therapeutics, Ferroelectric polymers, Photography

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Proceedings Article | 7 March 2009 Paper

Near infrared femtosecond laser ablation of urinary calculi in water

Jinze Qiu, Joel Teichman, Roman Kuranov, Austin McElroy, Tianyi Wang, Amit Paranjape, Thomas Milner

Proceedings Volume 7203, 720309 (2009) https://doi.org/10.1117/12.809196

KEYWORDS: Calculi, Laser ablation, Femtosecond phenomena, Optical coherence tomography, Objectives, Pulsed laser operation, Near infrared, Laser therapeutics, Absorption, Optical fibers

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Proceedings Article | 23 February 2009 Paper

Quantification of holmium:YAG optical tip degradation

Adam Mues, Joel Teichman, Bodo Knudsen

Proceedings Volume 7161, 71611F (2009) https://doi.org/10.1117/12.808528

KEYWORDS: Stereolithography, Fiber lasers, Waveguides, Global system for mobile communications, Laser therapeutics, Optical fibers, Optics manufacturing, Cladding, Aluminum, Garnet

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Proceedings Article | 22 February 2006 Paper

A comparison of single use and reusable small core sized holmium:YAG laser fibers: Is there a difference in the risk of fiber failure?

Bodo Knudsen, Randolph Glickman, Joel Teichman

Proceedings Volume 6078, 607813 (2006) https://doi.org/10.1117/12.646864

KEYWORDS: Optical fibers, Fiber lasers, Waveguides, Manufacturing, Shape memory alloys, Connectors, Laser lithotripsy, Endoscopes, Holmium, Singular optics

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Proceedings Article | 22 February 2006 Paper

Investigation of stone retropulsion as a function of Ho:YAG laser pulse duration

Hyun Wook Kang, Ho Lee, Jason Petersen, J. Teichman, A. Welch

Proceedings Volume 6078, 607815 (2006) https://doi.org/10.1117/12.646513

KEYWORDS: Optical fibers, Pulsed laser operation, Laser ablation, Calculus, Laser lithotripsy, Optical coherence tomography, Distance measurement, High speed cameras, Calculi, Interfaces

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Proceedings Article | 25 April 2005 Paper

Comparison of urinary calculus fragmentation during Ho:YAG and Er:YAG lithotripsy

Hyun Wook Kang, Ho Lee, Joel Teichman, A. Welch

Proceedings Volume 5686, (2005) https://doi.org/10.1117/12.589455

KEYWORDS: Er:YAG lasers, Laser ablation, Calculus, Pulsed laser operation, Calculi, Absorption, Laser drilling, Energy efficiency, Laser lithotripsy, Laser therapeutics

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Proceedings Article | 13 June 2000 Paper

Further characterization of photothermal breakdown products of uric acid stones following holmium:YAG laser lithotripsy

Randolph Glickman, Susan Weintraub, Neeru Kumar, Nicole Corbin, Omid Lesani, Joel Teichman

Proceedings Volume 3914, (2000) https://doi.org/10.1117/12.388040

KEYWORDS: Mass spectrometry, Absorption, Nd:YAG lasers, Ultraviolet radiation, Statistical analysis, Cyanide, Laser irradiation, Laser ablation, Chemical analysis, Calculi

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Proceedings Article | 13 June 2000 Paper

In-vitro Erbium:YAG laser lithotripsy

Kin Foong Chan, Gracie Vargas, Patricia Parker, Joel Teichman, Randolph Glickman, H. Stan McGuff, Ashley Welch

Proceedings Volume 3914, (2000) https://doi.org/10.1117/12.388046

KEYWORDS: Er:YAG lasers, Calculus, Acoustics, Sapphire, Laser lithotripsy, Plasma, Fiber lasers, Pulsed laser operation, Laser therapeutics, Laser energy

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Proceedings Article | 17 May 2000 Paper

Proteus mirabilis viability after lithotripsy of struvite calculi

Sabitha Prabakharan, Joel Teichman, Scott Spore, Edmund Sabanegh, Randolph Glickman, Robert McLean

Proceedings Volume 3907, (2000) https://doi.org/10.1117/12.386261

KEYWORDS: Calculi, Control systems, Bacteria, Dye lasers, Ultrasonics, Magnesium, Laser therapeutics, Acoustics, Information operations, Statistical analysis

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Proceedings Article | 28 April 2000 Paper

Influence of optical absorption on urinary calculus threshold fluence and ablation efficiency during infrared laser ablation

Kin Foong Chan, Daniel Hammer, Bernard Choi, Gracie Vargas, Brian Sorg, T. Joshua Pfefer, Joel Teichman, H. Stan McGuff, Hans Pratisto, E. Duco Jansen, Ashley Welch

Proceedings Volume 3925, (2000) https://doi.org/10.1117/12.384253

KEYWORDS: Laser ablation, Absorption, Calculi, Laser damage threshold, Tissue optics, Calculus, Absorbance, Hard tissue optics, Free electron lasers, Infrared radiation

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Proceedings Article | 17 September 1999 Paper

Photothermal ablation is the primary mechanism in holmium:YAG laser lithotripsy of urinary calculi

Randolph Glickman, Joel Teichman, Nicole Corbin, George Vassar, Susan Weintraub, Kin Foong Chan, Ashley Welch

Proceedings Volume 3863, (1999) https://doi.org/10.1117/12.364416

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Proceedings Article | 22 June 1999 Paper

Photothermal laser lithotripsy of uric acid calculi: clinical assessment of the effects of cyanide production

Joel Teichman, Paolo Champion, Randolph Glickman, Timothy Wollin, John Denstedt

Proceedings Volume 3590, (1999) https://doi.org/10.1117/12.350964

KEYWORDS: Cyanide, Calculi, Toxicity, Bladder, Calculus, Absorption, Cystoscopy, Laser lithotripsy, Mercury, Blood

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Proceedings Article | 14 June 1999 Paper

Chemical decomposition of urinary stones during holmium-laser lithotripsy: II. Evidence for photothermal breakdown

Randolph Glickman, Joel Teichman, George Vassar, Susan Weintraub, Kin Foong Chan, T. Joshua Pfefer, Ashley Welch

Proceedings Volume 3601, (1999) https://doi.org/10.1117/12.350022

KEYWORDS: Laser ablation, Magnesium, Cyanide, Calcium, Laser energy, Calculi, Pulsed laser operation, Absorption, Laser therapeutics, Chemical analysis

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Proceedings Article | 14 June 1999 Paper

Chemical decomposition of urinary stones during holmium-laser lithotripsy: I. Lack of a photomechanical effect

Kin Foong Chan, George Vassar, T. Joshua Pfefer, Joel Teichman, Randolph Glickman, Susan Weintraub, Ashley Welch

Proceedings Volume 3601, (1999) https://doi.org/10.1117/12.350023

KEYWORDS: Holmium, Acoustics, Pulsed laser operation, Laser energy, Laser therapeutics, Laser lithotripsy, Photography, Cavitation, Calculus, Fiber lasers

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