Thermal effects in tissues from combined simultaneous coaxial CO2 and Nd:YAG laser beams
✍ Scribed by Dr. Millard M. Judy; J. Lester Matthews; J. Rush Goodson; Donald F. Hults; Esa Viherkoski; Billie L. Aronoff
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 977 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0196-8092
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✦ Synopsis
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, and Nd:YAG (1.064 pM) laser beams. At values of 20 w and 40 w, respectively, and at values of 30 w and 60 w, respectively, of combined CO, and NdYAG 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 c0.05) 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, and Nd:k'AG 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 ((20,) and 60 w (NdYAG) 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, to Nd:YAG laser power in the range 23 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, and NdYAG laser beams in surgery of the more vascular organs and tissues. o 1992 Wiley-Liss, Inc.