Share Email Print

Journal of Biomedical Optics

Rapid sealing of porcine renal blood vessels, ex vivo, using a high power, 1470-nm laser, and laparoscopic prototype
Author(s): Luke A. Hardy; Thomas C. Hutchens; Eric R. Larson; David A. Gonzalez; Chun-Hung Chang; William H. Nau; Nathaniel M. Fried
Format Member Price Non-Member Price
PDF $20.00 $25.00

Paper Abstract

Energy-based, radiofrequency (RF) and ultrasonic (US) devices currently provide rapid sealing of blood vessels during laparoscopic procedures. We are exploring infrared lasers as an alternate energy modality for vessel sealing, capable of generating less collateral thermal damage. Previous studies demonstrated feasibility of sealing vessels in an in vivo porcine model using a 1470-nm laser. However, the initial prototype was designed for testing in open surgery and featured tissue clasping and light delivery mechanisms incompatible with laparoscopic surgery. In this study, a laparoscopic prototype similar to devices currently in surgical use was developed, and performance tests were conducted on porcine renal blood vessels, ex vivo. The 5-mm outer-diameter laparoscopic prototype featured a traditional Maryland jaw configuration that enables tissue manipulation and blunt dissection. Laser energy was delivered through a 550 - μ m -core-diameter optical fiber with side-delivery from the lower jaw and beam dimensions of 18 - mm length × 1.2 - mm width . The 1470-nm diode laser delivered 68 W with 3-s activation time, consistent with vessel seal times associated with RF and US-based devices. A total of 69 fresh porcine renal vessels with mean diameter of 3.3 ± 1.7    mm were tested, ex vivo. Vessels smaller than 5-mm diameter were consistently sealed (48/51) with burst pressures greater than malignant hypertension blood pressure (180 mmHg), averaging 1038 ± 474    mmHg . Vessels larger than 5 mm were not consistently sealed (6/18), yielding burst pressures of only 174 ± 221    mmHg . Seal width, thermal damage zone, and thermal spread averaged 1.7 ± 0.8 , 3.4 ± 0.7 , and 1.0 ±

Paper Details

Date Published: 27 May 2017
PDF: 7 pages
J. Biomed. Opt. 22(5) 058002 doi: 10.1117/1.JBO.22.5.058002
Published in: Journal of Biomedical Optics Volume 22, Issue 5
Show Author Affiliations
Luke A. Hardy, The Univ. of North Carolina at Charlotte (United States)
Thomas C. Hutchens, The Univ. of North Carolina at Charlotte (United States)
Eric R. Larson, Medtronic, Inc. (United States)
David A. Gonzalez, The Univ. of North Carolina at Charlotte (United States)
Chun-Hung Chang, The Univ. of North Carolina at Charlotte (United States)
William H. Nau, Medtronic, Inc. (United States)
Nathaniel M. Fried, The Univ. of North Carolina at Charlotte (United States)

© SPIE. Terms of Use
Back to Top