Soft Tissue Effects of the THC:YAG Laser on Canine Vocal Cords

Recently, a laser based on a thulium-holmium-chromium (THC) doped yittrium-aiuminum-garnet (YAG) rod has been developed that produces light of 2.15 microns wave-length and can be transmitted through a low OH- silica fiberoptic cable. This wave-length falls on one of the peaks of the energy absorption spectrum of water. Thus, the THC:YAG laser eliminates the disadvantage of a cumbersome delivery system found in the CO2 laser while still providing precise cutting and minimal tissue injury inherent in lasers emitting light absorbed by water. We evaluated the soft tissue effects of this laser on canine vocal cords. Ablative lesions were produced by the THC:YAG laser and histologically examined on postoperative days 1, 7, and 28. Results indicate that the depth of tissue penetration is easily controlled and the healing response to tissue injury is comparable to that of the CO2 laser. The THC:YAG laser should prove to be a superior laser for use in otorhinolaryngology, especially when adapted to a flexible endoscope.

[1]  S. Shapshay,et al.  Soft tissue effects of the holmium-YSGG laser in the canine trachea , 1990, Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery.

[2]  R. Leonard,et al.  Effects of Stripping and Laser Excision on Vocal Fold Mucosa in Cats , 1988, The Annals of otology, rhinology, and laryngology.

[3]  M. Treat,et al.  Preliminary evaluation of a pulsed 2.15‐μm laser system for fiberoptic endoscopic surgery , 1988, Lasers in surgery and medicine.

[4]  R. Anderson,et al.  Pulsed CO2 laser tissue ablation: Effect of tissue type and pulse duration on thermal damage , 1988, Lasers in surgery and medicine.

[5]  R. Toohill,et al.  Wound Healing of True Vocal Cord Squamous Epithelium after CO2 Laser Ablation and Cup Forceps Stripping , 1986, Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery.

[6]  R M Browne,et al.  A comparative histological study of wound healing following CO2 laser and conventional surgical excision of canine buccal mucosa. , 1983, Archives of oral biology.

[7]  C. Norris,et al.  Experimental skin incision made with the carbon dioxide laser , 1982, The Laryngoscope.

[8]  G. W. Grimes,et al.  Qualitative and morphometric evaluation of vocal cord lesions produced by the carbon dioxide laser , 1980, The Laryngoscope.

[9]  M. Strong.  Laser surgery in otolaryngology. , 1974, Texas medicine.

[10]  T. Polanyi,et al.  Experimental carbon dioxide laser surgery of the vocal cords. , 1973, Eye, ear, nose & throat monthly.

[11]  G. Jako.  Laser surgery of the vocal cords An experimental study with carbon dioxide lasers on dogs , 1972, The Laryngoscope.

[12]  M. Strong,et al.  Laser Surgery in the Larynx Early Clinical Experience with Continuous Co2 Laser , 1972, The Annals of otology, rhinology, and laryngology.

[13]  R. R. Hall,et al.  The healing of tissues incised by a carbon‐dioxide laser , 1971, The British journal of surgery.

[14]  R. Mcminn,et al.  The cytology of repair in experimental perforations of the tympanic membrane , 1966, The British journal of surgery.