Premium
Thermo‐controlled device for inducing deep coagulation in the liver with the Nd:YAG laser
Author(s) -
Orth Klaus,
Russ Detlef,
Duerr Jochen,
Hibst Ralmund,
Steiner Rudolf,
Beger Hans Günther
Publication year - 1997
Publication title -
lasers in surgery and medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 112
eISSN - 1096-9101
pISSN - 0196-8092
DOI - 10.1002/(sici)1096-9101(1997)20:2<149::aid-lsm5>3.0.co;2-q
Subject(s) - laser , materials science , biomedical engineering , homogeneous , coagulation , volume (thermodynamics) , optics , medicine , physics , quantum mechanics , psychiatry , thermodynamics
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 ∼60°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 ∼25 cm 3 . Lasers Surg. Med. 20:149–156, 1997. © 1997 Wiley‐Liss, Inc.