Thermo-controlled device for inducing deep coagulation in the liver with the Nd:YAG laser

✍ Scribed by Orth, Klaus; Russ, Detlef; Duerr, Jochen; Hibst, Ralmund; Steiner, Rudolf; Beger, Hans Günther

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 494 KB
• Volume: 20
• Category: Article
• ISSN: 0196-8092
• DOI: 10.1002/(sici)1096-9101(1997)20:2<149::aid-lsm5>3.0.co;2-q

✦ Synopsis

Background and objective:

To increase the effectiveness of laser-induced interstitial thermotherapy (litt), a new thermo-controlled application system for minimal invasive intervention was designed. our system consists of a laser applicator of 2.5 mm in diameter, insertion equipment, and a nd:yag-laser source.

Study design/materials and methods:

A cylindrical light emitting fiber (1-6 cm in length) was placed in the center of the applicator. the surrounding tissue was irradiated through a duran window at the distal end of the applicator. the power of the laser source was controlled dynamically by thermosensors in a water-cooling system of the laser applicator. the temperature at the surface of the duran window was kept constant at approximately 60 degrees c, without charring the surrounding tissue.

Results/conclusion:

We obtained homogeneous coagulation zones. in in vitro experiments with pig livers, we reached ellipsoid coagulation volumes of 3 and 5 cm in diameter within 10 minutes, corresponding to a volume of approximately 25 cm3.