Share Email Print

Proceedings Paper

Laser welding of urinary tissues, ex vivo, using a tunable Thulium fiber laser
Author(s): Anthony K. Ngo; Utkarsh Sharma; Jin U. Kang; Nathaniel M. Fried
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Recent advances in Thulium fiber laser technology have resulted in the availability of a compact, inexpensive, tunable, mid-infrared laser for potential use in laser surgery. The objective of this study was to tune the Thulium fiber laser wavelength and corresponding optical penetration depth to match the tissue thickness, and thus produce full-thickness, watertight tissue closure during microsurgical laser welding of urinary tissues. 1-cm-length incisions were made, ex vivo, in porcine ureters. Thulium fiber laser radiation with a wavelength of 1873 nm, power of 550-650 mW, and 750-μm-diameter spot was delivered to the tissue in continuous-wave mode through a 600-μm silica optical fiber. The fiber was scanned over the weld site once at a rate of 0.1 mm/s using a motion controller and linear stage controlled by a PC. Optical coherence tomography, histology, flow rates, and temperature measurements were used to optimize and evaluate laser welding success. Histologic analysis demonstrated full-thickness welding of the ureteral wall. Weld success rates ranged from 67% (8/12) at an incident laser power of 550 mW to 91% (10/11) at 650 mW. Peak flow rates greater than 200 ml/min were measured, however, mean flow rates were only about 50 ml/min. Average tissue temperatures increased with incident laser power from 59-89oC. The tunable Thulium fiber laser may be useful for surgical applications requiring variable control of thermal coagulation depth, such as microsurgical laser tissue welding.

Paper Details

Date Published: 22 February 2006
PDF: 8 pages
Proc. SPIE 6078, Photonic Therapeutics and Diagnostics II, 60781B (22 February 2006); doi: 10.1117/12.645114
Show Author Affiliations
Anthony K. Ngo, Johns Hopkins Univ. (United States)
Utkarsh Sharma, Johns Hopkins Univ. (United States)
Jin U. Kang, Johns Hopkins Univ. (United States)
Nathaniel M. Fried, Johns Hopkins Univ. (United States)

Published in SPIE Proceedings Vol. 6078:
Photonic Therapeutics and Diagnostics II
Kenton W. Gregory; Nikiforos Kollias; Reza S. Malek; Michael D. Lucroy; Henry Hirschberg; Brian Jet-Fei Wong; Eugene A. Trowers; Werner T.W. de Riese; Justus F. R. Ilgner; Steen J. Madsen; Lloyd P. Tate; Haishan Zeng; Guillermo J. Tearney; Bernard Choi, Editor(s)

© SPIE. Terms of Use
Back to Top