Different laser wavelenghts in ablative and residual termal lesions of intervertebral lumbar discs: volumetric fresh tissue evaluation by MER and hystomorphmetric studies

• Grant number: 14/13673-6
• Support Opportunities: Regular Research Grants
• Start date: February 01, 2015
• End date: January 31, 2016
• Field of knowledge: Health Sciences - Medicine - Surgery
• Principal Investigator: Helio Plapler
• Grantee: Helio Plapler
• Host Institution: Escola Paulista de Medicina (EPM). Universidade Federal de São Paulo (UNIFESP). Campus São Paulo. São Paulo , SP, Brazil
• Associated researchers: Valéria Regina Gonzalez Sella

Abstract

Laser discectomy or nucleotomy is an increasingly important method in less invasive procedures of column, but the ideal laser is still a matter of study. Objectives: to investigate the action of the laser emission in the infrared (808nm the 1908nm) region in the context of surgical procedures for percutaneous intervertebral disk decompression (nucleotomy). Methods: 50 intervertebral discs of the lumbar spine of pigs will be irradiated with laser (l = 808, 980, 1460 and 1908nm), with one-second on/off time cycles, 120 cycles and 10W of power (808.980 and 1460nm) or 240 cycles and 5W (1908nm) with total power of 1200J and subjected to EMR evaluation for measurement of ablation lesions and residual thermal lesions. Expected results: Ablation lesions as well as the residual thermal lesions for 1908nm group should be the smallest compared to other wavelenghts. Conclusion: The laser at a 1908nm wavelength should be more efficient, followed by the wavelengths of 1460, 808 and 980nm for the vaporization of the nucleus pulpousus and could be recommended for laser nucleotomy procedure (AU)