Optical characteristics of side-firing fibers for laser prostatectomy

Remco J. van Vliet; David G. Molenaar; Christiaan F. P. van Swol; Tom A. Boon; Rudolf M. Verdaasdonck

doi:10.1117/12.197517

22 December 1994 Optical characteristics of side-firing fibers for laser prostatectomy

Remco J. van Vliet, David G. Molenaar, Christiaan F. P. van Swol, Tom A. Boon, Rudolf M. Verdaasdonck

Proceedings Volume 2328, Biomedical Optoelectronic Devices and Systems II; (1994) https://doi.org/10.1117/12.197517
Event: International Symposium on Biomedical Optics Europe '94, 1994, Lille, France

Abstract

Various side firing fibers have been developed in the past two years for Nd:YAG laser treatment of Benign Prostatic Hyperplasia (BPH). The method to deflect the beam laterally determines the power density at the urethral wall and consequent tissue effects. In this study the optical characteristics of eight different side firing fibers were evaluated by measuring transmission and bean profiles. A scanning device was developed which consisted of a sensor that was translated in two directions in front of the side firing fiber, while submerged in water. The transmission of the devices was measured by placing them in a transparent water filled tank in front of a power meter. The scans provided a three dimensional power density distribution of the fibers. The exit angle varied from 41 to 100 degrees, with respect to the fiber axis. The divergence of the beams was different in two directions, resulting in an elliptical spot at the urethral wall. The spot size ranged from 6.6 to 17.5 mm² for a clinically relevant situation at 5 mm from the tip. The transmission of a new side firing fiber ranged from 43 to 83 percent compared to a bare fiber. Due to the unique optical characteristics of each device, there is a large variation in the power density at the tissue and thus a specific dosimetry protocol for each fiber is required.

Citation Download Citation

Remco J. van Vliet, David G. Molenaar, Christiaan F. P. van Swol, Tom A. Boon, and Rudolf M. Verdaasdonck "Optical characteristics of side-firing fibers for laser prostatectomy", Proc. SPIE 2328, Biomedical Optoelectronic Devices and Systems II, (22 December 1994); https://doi.org/10.1117/12.197517

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