Dr. Arlen K. Ward Profile

Dr. Arlen K. Ward

at System Insight Engineering

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Publications (4)

Proceedings Article | 26 February 2015 Paper

Infrared laser sealing of porcine tissues: preliminary in vivo studies

Christopher Cilip, Thomas Hutchens, Duane Kerr, Cassandra Latimer, Sarah Rosenbury, Nicholas Giglio, Gino Schweinsberger, William Perkins, Christopher Wilson, Arlen Ward, William Nau, Nathaniel Fried

Proceedings Volume 9303, 930319 (2015) https://doi.org/10.1117/12.2076211

KEYWORDS: Arteries, Tissues, Infrared lasers, In vivo imaging, Laser beam diagnostics, Blood vessels, Liver, Lung, Collagen, Prototyping

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SPIE Journal Paper | 21 March 2014 Open Access

Rapid sealing and cutting of porcine blood vessels, ex vivo, using a high-power, 1470-nm diode laser

Nicholas Giglio, Thomas Hutchens, William Perkins, Cassandra Latimer, Arlen Ward, William Nau, Nathaniel Fried

JBO, Vol. 19, Issue 03, 038002, (March 2014) https://doi.org/10.1117/12.10.1117/1.JBO.19.3.038002

KEYWORDS: Blood vessels, Laser cutting, Tissues, Ultrasonics, Semiconductor lasers, Infrared lasers, Blood pressure, High power lasers, Surgery, Tissue optics

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Suture ligation with subsequent cutting of blood vessels to maintain hemostasis during surgery is time consuming and skill intensive. Energy-based electrosurgical and ultrasonic devices are often used to replace sutures and mechanical clips to provide rapid hemostasis and decrease surgery time. Some of these devices may create undesirably large collateral zones of thermal damage and tissue necrosis, or require separate mechanical blades for cutting. Infrared lasers are currently being explored as alternative energy sources for vessel sealing applications. In a previous study, a 1470-nm laser was used to seal vessels 1 to 6 mm in diameter in 5 s, yielding burst pressures of ∼500 mmHg . The purpose of this study was to provide vessel sealing times comparable with current energy-based devices, incorporate transection of sealed vessels, and demonstrate high vessel burst pressures to provide a safety margin for future clinical use. A 110-W, 1470-nm laser beam was transmitted through a fiber and beam shaping optics, producing a 90-W linear beam 3.0 by 9.5 mm for sealing (400 W/cm 2 ), and 1.1 by 9.6 mm for cutting (1080 W/cm 2 ). A two-step process sealed and then transected ex vivo porcine renal vessels (1.5 to 8.5 mm diameter) in a bench top setup. Seal and cut times were 1.0 s each. A burst pressure system measured seal strength, and histologic measurements of lateral thermal spread were also recorded. All blood vessels tested (n=55 seal samples) were sealed and cut, with total irradiation times of 2.0 s and mean burst pressures of 1305±783 mmHg . Additional unburst vessels were processed for histological analysis, showing a lateral thermal spread of 0.94±0.48 mm (n=14 seal samples). This study demonstrated that an optical-based system is capable of precisely sealing and cutting a wide range of porcine renal vessel sizes and, with further development, may provide an alternative to radiofrequency- and ultrasonic-based vessel sealing devices.

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Proceedings Article | 4 March 2014 Paper

Rapid infrared laser sealing and cutting of porcine renal vessels, ex vivo

Nicholas Giglio, Thomas Hutchens, William Perkins, Cassandra Latimer, Arlen Ward, William Nau, Nathaniel Fried

Proceedings Volume 8926, 892619 (2014) https://doi.org/10.1117/12.2037055

KEYWORDS: Laser cutting, Blood vessels, Tissues, Infrared lasers, Ultrasonics, Laser tissue interaction, Blood pressure, Fusion energy, Electronic test equipment, Surgery

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Proceedings Article | 26 February 2013 Paper

Predicting tissue division rates for TURP systems using finite element simulations

Arlen Ward, George Collins

Proceedings Volume 8584, 85840A (2013) https://doi.org/10.1117/12.2006426

KEYWORDS: Tissues, Prostate, Electrodes, Mathematical modeling, In vitro testing, Atmospheric modeling, Instrument modeling, Bladder, Computing systems, Computer simulations

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