TAILIEUCHUNG - Laser Welding Part 3

Tham khảo tài liệu 'laser welding part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 34 Laser Welding On the other hand Happak et al. suggested that a minimal amount of collagen and other proteins of the epineurium provides sufficient welding strength in case of an adequate laser irradiation being applied without additional bonding materials or stay suture. This has been documented by the lack of dehiscences of the coapted nerves after 6 months of regeneration in their study Happak et al. 2000 . And Hwang et al. performed facial nerve repair by laser nerve welding and microsurgical suture in rat model and they also reported that they did not perform supportive procedures to enhance the laser welding site and there was no dehiscence in any of the 12 rats Hwang et al. 2005 . 3. Experimental study During the last decade laser has become an increasingly useful surgical tool and laser welding repair of injured peripheral nerves has been investigated. Since first successful CO2 laser welded coaptations were published by Fischer et al. in 1985 Fischer et al. 1985 several authors reported that laser nerve welding was at least equal or more successful to microsurgical suture in effectiveness in animal model of facial and sciatic nerve repairs. Facial nerve repair and facial - hypoglossal nerve anastomosis Eppley et al. performed an experimental study to evaluate the effectiveness of laser nerve welding versus conventional suture repair of facial nerve grafts in the rabbit Eppley et al. 1989 . A group of 10 animals underwent bilateral 1 cm facial nerve resections which were primarily repaired with the contralateral resected nerve in which the right side was anastomosed by suture CMSR interrupted epinueural 10-0 nylon sutures and the left side by laser nerve welding CO2 laser with 150mW 300u spot size and duration assisted by a single suture for traction and rotation . Postoperative assessment was carried out at 1 and 3 months and consisted of electrophysiological recording prior to sacrifice which was compared to preoperative recordings of the same

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