Correction method of bending loss in the hollow optical fiber for endoscopic submucosal dissection using carbon dioxide laser

Daisuke Kusakari; Hisanao Hazama; Kunio Awazu

doi:10.1117/12.2080625

5 March 2015 Correction method of bending loss in the hollow optical fiber for endoscopic submucosal dissection using carbon dioxide laser

Daisuke Kusakari, Hisanao Hazama, Kunio Awazu

Author Affiliations +

Proceedings Volume 9317, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XV; 931712 (2015) https://doi.org/10.1117/12.2080625
Event: SPIE BiOS, 2015, San Francisco, California, United States

Abstract

Endoscopic submucosal dissection using carbon dioxide laser is a promising treatment of early digestive cancer because it can avoid the risk of perforation. Although a hollow optical fiber transmitting mid-infrared light has been used, it was observed that the irradiation effect was influenced by bending a gastrointestinal gastrointestinal endoscope due to the change in transmittance by the bending loss. Therefore, we quantitatively evaluated the change in the irradiation effect by bending the hollow optical fiber in the gastrointestinal endoscope and proposed a correction method to stabilize the irradiation effect. First, the relationship between the irradiated laser energy density and the incision depth for porcine stomach was measured by bending the head of the gastrointestinal endoscope. Next, the relationship between the bending angle of the head of the gastrointestinal endoscope and the temperature rise of the hollow optical fiber in the head of the gastrointestinal endoscope was measured during the laser irradiation. As a result, the laser energy density and the incision depth decreased as the bending angle increased, and linear correlation between the laser energy density and the incision depth was observed. It was found that the bending angle can be estimated by the ratio of the setting laser power to time derivative of the temporal profile of the temperature of the hollow optical fiber. In conclusion, it is suggested that the correction of the laser energy density and stabilization of the incision capability is possible by measuring the temporal profile of the temperature of the hollow optical fiber.

Citation Download Citation

Daisuke Kusakari, Hisanao Hazama, and Kunio Awazu "Correction method of bending loss in the hollow optical fiber for endoscopic submucosal dissection using carbon dioxide laser", Proc. SPIE 9317, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XV, 931712 (5 March 2015); https://doi.org/10.1117/12.2080625

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
7 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Endoscopes

Optical fibers

Head

Carbon dioxide lasers

Fiber lasers

Laser energy

Temperature metrology

Show All Keywords

Keywords/Phrases

Search In:

Publication Years