Application of pulsed and continuous wave 1.32 and 1.06 μm wavelengths of the Nd:YAG laser in the canine tracheobronchial tree: A comparative study

✍ Scribed by Elie E. Rebeiz; H. Thomas Aretz; Stanley M. Shapshay; Michail M. Pankratov

• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 860 KB
• Volume: 10
• Category: Article
• ISSN: 0196-8092
• DOI: 10.1002/lsm.1900100602

✦ Synopsis

Previous investigations have shown good clinical potential for the use of the 1.32 pm wavelength Nd:YAG laser because its soft tissue absorption is better than that of the 1.06 pm wavelength NdYAG laser. The 1.32 pm wavelength NdYAG laser has an absorption coefficient in water that is 10 times higher than the 1.06 p m wavelength Nd:YAG laser. A comparative in vivo study of laser soft tissue effects was performed by using the 1.32 pm wavelength and the 1.06 pm wavelength Nd:YAG lasers in a pulsed wave (PW) mode and continuous wave (CW) mode using a noncontact endoscopic delivery system. A standard 5 mm mucosal lesion was made in the canine tracheobronchial tree down to the level of the perichondrium. Soft tissue and cartilage effects were examined by light and scanning electron microscopy, acutely, 1 week and 2 weeks after operation, and a comparison was made between the different laser modalities. To create similar lesions, higher energy was required when using the 1.06 pm wavelength NdYAG laser. Soft tissue injury was greater with the 1.06 pm wavelength in CW mode, and no cartilage damage occurred in the PW mode. Soft tissue and cartilage repair after 1 and 2 weeks was better with the 1.32 pm wavelength laser. In comparison, the C02 laser and the contact NdYAG laser proved to be more precise cutting tools than the 1.32 p m wavelength or the 1.06 pm wavelength Nd:YAG lasers. Both Nd:Yag laser wavelengths were useful for coagulation and vaporization of tissues and blood vessels. More studies are needed to determine the effect of the new 1.32 p m wavelengths on endotracheal tumors.