A temperature-controlled laser hot needle with grating sensor for liver tissue tract ablation
Document Type
Article
Publication Date
9-1-2020
Abstract
In this article, we proposed a laser hot needle for liver tissue tract ablation. The proposed laser hot needle is powered by a 4500-nm-diode laser incorporated with a closed-loop control system that comprises of a uniform fiber Bragg grating (FBG) temperature sensor and a computer. Based on the real-time feedback input from the FBG temperature sensor, the laser power is regulated by a proportional-integral-derivative (PID) control system to control the needle temperature. In the characterization test, a chirped grating-based distributed temperature sensor is employed for measuring the tissue temperature profile in the ex vivo bovine liver tissue during the ablation. A histological test is conducted to study the impact of tract ablation to the cellular structures of treated tissue and tissue coagulation. In a tract ablation test, a similar to 50-mm x similar to 6-mm (length x width) thermal denaturation zone has been created on ex vivo bovine liver tissue with the laser hot needle at 150 degrees C.
Keywords
Biomedical device, Control system, Fiber Bragg grating (FBG) sensor, Medical laser device, Tissue ablation
Divisions
photonics
Funders
Taylor’s University
Publication Title
IEEE Transactions on Instrumentation and Measurement
Volume
69
Issue
9
Publisher
Institute of Electrical and Electronics Engineers Inc.
Publisher Location
445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA