Navegando por Palavras-chave "Lasers semicondutores"

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    Anastomose carotídea usando laser diodo de diferentes comprimentos de onda e a avaliação da resistência da parede em suínos.
    (Universidade Federal de São Paulo (UNIFESP), 2018-10-25) Andrade, Luciane Basilio Alledi [UNIFESP]; Plapler, Helio [UNIFESP]; Fagundes, Djalma José; http://lattes.cnpq.br/8694381071456316; http://lattes.cnpq.br/2871630525937037; http://lattes.cnpq.br/3022078938154501; Universidade Federal de São Paulo (UNIFESP)
    Objective: due to the advantages of LAVA (less occurence of miointimal hyperplasia with better hemodynamic evolution, shorter surgical time, absence of diameter incompatibility, absence of anaphylaxis, easy execution) the evaluation of the ideal diode laser wavelength to perform these anastomosis without solder is a great advance in the surgical practice. Method: End-to-end anastomosis was performed on the common carotid arteries of swines, bilaterally, using diode lasers by the wavelengths: 808 nm (n=16), 980 nm (n=16), 1470 nm (n=16) and 1908 nm (n=16) with the same parameters (CW, spot size=2mm, P≅5,1W, t=26s, E= 132,6J, I= 164,51 W/cm2, F= 4277,4 J/cm2). Following, the occurrence of bleeding was verified. When the anastomosis did not bleed a mechanical resistance test was performed. Results: In group 808 nm, there was no welding of the vessels. In group 1908 nm, carbonization of all arterial edges was observed. In groups 980 nm and 1470 nm, the anastomosis results were satisfactory. In group 980 nm, 50% of the anastomosis cases exhibited bleeding and the medium leaking point pressure was 155 ± 56,3 mmHg. In group 1470 nm, 31,3% of the anastomosis cases exhibited bleeding and the medium leaking point pressure was 179,1 ± 37,0 mmHg. There was no statistically significant difference in leaking point pressures between the groups 1470 nm and 980 nm (p=0,094). Based on the physiological blood pressure levels for group 980 nm, the bleeding risk was higher and the survival probability was lower than that of group 1470 nm (p=0,022). Conclusions: The best results for anastomosis in carotid arteries without solder were achieved with 980 nm and 1470 nm. The higher survival probability with lower bleeding risk was obtained by 1470nm anastomosis on carotid arteries.
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    Comparação da eficiência do laser de diodo 980 nm versus glicose a 75% na oclusão de veias da orelha de coelhos
    (Universidade Federal de São Paulo (UNIFESP), 2010-09-29) Lima, Paulo Roberto da Silva [UNIFESP]; Baptista-Silva, José Carlos Costa [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    Contexto. Por ser o laser um método novo no tratamento das varizes, há muitos mitos e dúvidas com relação à sua eficácia; veio a necessidade de compará-lo às substâncias esclerosantes mais utilizadas em nosso meio. Assim, é relevante responder a pergunta de pesquisa: qual a eficiência do laser de diodo 980 nm em comparação à glicose 75% na oclusão de veias em orelha de coelho? Objetivo. Comparar a eficiência do laser de diodo 980 nm à glicose 75% na oclusão de veias em orelha de coelho. A hipótese é que o laser de diodo 980 nm tenha uma eficiência de 30% em relação à glicose 75%. Tipo de estudo. Ensaio aleatório em animais de laboratório por 21 dias. Local. Biotério do Laboratório de Tecnologia Farmacêutica (LTF) do Campus I da Universidade Federal da Paraíba, João Pessoa – PB. Amostra. Orelhas de coelhos machos. Procedimentos. Grupo L (LASER): 15 orelhas tratadas com laser e grupo G (glicose 75%): 15 orelhas tratadas com glicose 75%. Variáveis. Primárias: veias esclerosadas e/ou ocluídas. Secundárias: segurança. Complementares: volume da substância administrada, calibre e tamanho do vaso, peso e idade do coelho. Método estatístico. O tamanho da amostra foi estimado em 30 orelhas com base na literatura e para respeitar as normas da COBEA. A análise estatística será realizada com o teste exato de Fisher associado ao Risco Relativo (RR) e calculando o intervalo de confiança (IC) de 95% para cada ponto estimado Resultados. Característica da amostra. Congestão vascular no grupo G foi 87% (13/15, IC 95% 60 a 98) e no grupo L de 67% (10/15, IC 95% 38 a 88) com P = 0,3898 e RR de 1,30 (IC 95% 0,86 a 1,96). Hiperplasia intimal no grupo G foi 13% (2/15, IC 95% 2 a 40); e no grupo L 7% (1/14, IC 95% 0 a 32) com P = 1 e RR de 2,00 (IC 95% 0,20 a 19,79). Variáveis. A incidência de esclerose ou oclusão venosa foi no grupo G foi de 53% (8/15, IC 95% 27 a 79) e no grupo L 20% (3/15, IC 95% 4 a 49) com de P bicaudal foi de 0,1281, seu RR (risco relativo) usando a aproximação de Katz foi igual a 2,66 IC 95% 0,87 a 8,15 Conclusão. A eficiência do laser de diodo 980 nm em comparação à glicose 75% na oclusão de veias é a mesma.
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    Acesso aberto (Open Access)
    Complicações na dacriocistorrinostomia transcanalicular com laser diodo: complications
    (Conselho Brasileiro de Oftalmologia, 2009-08-01) Garcia, Eduardo Alonso [UNIFESP]; Cintra, Pedro Paulo Vivacqua Cunha; Universidade Federal de São Paulo (UNIFESP)
    PURPOSE: To evaluate the complications of the use of diode laser in the treatment of acquired nasolacrimal obstruction. METHODS: Forty four procedures (transcanalicular dacryocystorhinostomy with diode laser with bicanalicular silicone tube intubation and local anesthesia) where performed from February 2002 to November 2007 in 41 patients (3 bilaterally), 32 women and 9 men. RESULTS: The most common intraoperative complications were disability to pass the Crawford probe (13.6%) and the laser probe (11.3%). Regarding postoperative complications, epiphora was the event of higher frequency (15.9%) followed by the non-intentional silastic extrusion by the patient (11.3%). CONCLUSION: Intraoperative and postoperative complications rate were similar of others articles that demonstrated the same surgical technique (with same laser).
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    Enfrentamento da surdez em adultos usuários de implante coclear: uma busca de independência e autonomia
    (Universidade Federal de São Paulo (UNIFESP), 2017-02-23) Vieira, Sheila De Souza [UNIFESP]; Chiari, Brasilia Maria [UNIFESP]; Dupas, Giselle; http://lattes.cnpq.br/9461883918498554; http://lattes.cnpq.br/3118172851522969; http://lattes.cnpq.br/5466081448977540; Universidade Federal de São Paulo (UNIFESP)
    Objective: To understand how adult cochlear implant users face deafness and to create a theoretical model representative of the experience. And more specifically: to identify the difficulties and needs entailed by deafness before and after cochlear implantation; to understand the changes that the cochlear implant entails in daily life; and to identify coping strategies and the facilitating elements of this experience. Methods: The project was approved by the Research Ethics Committee of the institution (Opinion n ° 482,019). Qualitative research, using Symbolic Interactionism and Straussian Grounded Theory as the theoretical and methodological frameworks, respectively. A total of sixteen adult cochlear implant users, aged 18-60, who used the device for at least one year, participated in the study. Data collection instrument: semistructured interview, which covered questions about the trajectory from diagnosis to the present, inquiring about the changes caused by deafness and cochlear implantation in social relations, communication, family system, academic life and/or professional, in relationships, in leisure activities, and in personal projects. Results: The data analysis process led to the development of five categories that represent this experience. They are: Repercussions of deafness in adult life, Search for ways to solve problems, Facilitating factors in coping, Repercussions of cochlear implant use in adult life, and Difficulties after cochlear implantation. These categories make up a substantial theory represented by the process: SEEKING TO REGAIN INDEPENDENCE, AUTONOMY AND FREEDOM IN ADULT LIFE. Conclusion: Deafness profoundly impacts human social experiences, leading to changes and difficulties that affect the individual, family and society. However, the cochlear implant intervenes in a revolutionary way in the lives of its users, allowing them to live with a new perspective, to recover self-confidence and self-esteem, to communicate and interact more effectively, to feel more secure, to enjoy music and other types of entertainment, getting back past projects and make plans for the future. Thus fostering the recovery of the independence of adult life. In spite of this, the implanted person still experiences difficulties and limitations in the following aspects: agility to interact, reintegration into the labor market, going back to studying, localizing sounds spatially, experiencing prejudice and discrimination, using the phone, changes in balance and presence of tinnitus, costs with maintenance of the device, not being able to hear in situations where one needs to be without the IC, listening to music, understanding different types of entertainment, lack of family support, of assistive technology, and of continuity in psychological, social and auditory training rehabilitation. All these difficulties need to be identified and managed by the professionals who support the implanted person so that they can be overcome.