Design and realization of a fiber delivery system for the continuous wave and pulsed CO2 laser

Ad De Snaijer, Rudolf M. Verdaasdonk*, Matthijs C. Grimbergen, Christiaan F.P. Van Swol

*Corresponding author for this work

Research output: Contribution to journalConference articleAcademicpeer-review

2 Citations (Scopus)
3 Downloads (Pure)

Abstract

Recently, hollow wave guides (HWG) have become available enabling CO2 beam delivery for treatments in less accessible parts of the human body. In this study, an IR fiber delivery system was designed which can easily be attached to and removed from an existing medical laser (Coherent Ultra-Pulse 5000C) without interference with its normal functionality. The system accepts SMA terminated HWG with an inner diameter as small as 320 μm. Measurements were performed with 320-1000 μm diameter HWG (Rutgers University, USA). The coupling losses were around 10%. Transmission losses were up to 2.5 dB/m and depended on the bending radius of the fiber. The fibers tolerated pulse energies up to 400 mJ with peak powers of 800 W and an average power of 10 W. The beam quality was preserved during transmission. Despite the losses, the output energy easily exceeded the threshold for tissue ablation. The IR fiber delivery system was successfully used in a clinical setting. The flexible 320 μm fiber was introduced through the 1 mm working channel of a 2.3 mm fiber-endoscope with a 90 degree bendable tip. Tissue was effectively ablated with pulses up to 300 mJ out of the fiber. To prevent damage due to pollution of the coating inside the HWG, it will be necessary to close the distal end of the fiber by an IR transmitting material. The IR fiber delivery system has shown to be practical in clinical use without interference with the normal functionality of the CO2 laser. The system enables endoscopic application of CW and pulsed CO2 laser light.

Original languageEnglish
Pages (from-to)108-118
Number of pages11
JournalProceedings of SPIE - the international society for optical engineering
Volume3262
DOIs
Publication statusPublished - 1 Dec 1998
Externally publishedYes
EventSurgical-Assist Systems 1998 - San Jose, United States
Duration: 25 Jan 199828 Jan 1998

Keywords

  • CO laser
  • Flexible endoscope
  • Hollow wave guide
  • IR fibers
  • Laser surgery

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