Premium
Thermal effects in tissues from combined simultaneous coaxial CO 2 and Nd:YAG laser beams
Author(s) -
Judy Millard M.,
Matthews J. Lester,
Goodson J. Rush,
Hults Donald F.,
Viherkoski Esa,
Aronoff Billie L.
Publication year - 1992
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/lsm.1900120218
Subject(s) - laser , nd:yag laser , materials science , coaxial , hemostasis , charring , in vivo , biomedical engineering , nuclear medicine , chemistry , medicine , optics , surgery , biology , physics , electrical engineering , microbiology and biotechnology , engineering , composite material
This study examines the depth of thermal coagulation and charring in swine liver, kidney cortex, tongue (inferior surface), skeletal muscle, inflated lung, and skin resulting from in vivo incision with simultaneous coaxial CO 2 and Nd:YAG (1.064 μM) laser beams. At values of 20 w and 40 w, respectively, and at values of 30 w and 60 w, respectively, of combined CO 2 and Nd:YAG laser radiation, coagulation depths determined histologically in liver were significantly greater ( P <0.01) than in the other tissues and were significantly less in inflated lung ( P <0.05) than in other tissues for the larger laser power settings employed. Coagulation depths achieved at 10 w and 20 w, respectively, and at 20 w and 40 w, respectively, of CO 2 and Nd:YAG laser power were comparable to those obtained by other workers in liver and other relatively vascular tissues using a contact Nd:YAG laser tip. Charring depths obtained at power settings of 30 w (CO 2 ) and 60 w (Nd:YAG) were greater in liver ( P <0.001) than in all other tissues examined. Hemostasis during incision was achieved only for values of the ratio of CO 2 to Nd:YAG laser power in the range 2–3 in the more vascular tissues, liver and kidney cortex, whereas hemostasis was achieved also in the lesser vascular tissues at higher values. These results strongly suggest the usefulness of combined simultaneous CO 2 and Nd:YAG laser beams in surgery of the more vascular organs and tissues. © 1992 Wiley‐Liss, Inc.