Installation for Local Hyperthermia in Crossed Laser Fluxes

Abstract

As is well known, on heating up the tumor over 43 – 440C the tumor cells dies, whereas healthy tissues cells remain alive up to 500C. We propose local overheating malignant morbid growth, with infrared radiation from a laser system, focused on a specific area, forming this way a powerful, dispersed in the space, source of energy. To achieve the therapeutic dose in the body at depth of 10-12 cm is necessary to be used lasers with the radiation between wavelength range of 700nm - 850nm, for which there are seen windows of transparency in biological tissues, and the total power of 5 - 15 W. We have developed a installation, including: a block of laser diodes with individual collimating optics, directed in a common point; multi-channel thermometer of the irradiated area; two-axis table for accurate positioning of the irradiated sample with temperature sensors fixed on it relative to the common point of crossing lasers fluxes; computer, integrating all elements of the installation in one experimental - measuring station. The experimental results confirm the ability of the radiation with a wavelength of 808 nm to penetrate the biological tissue to a depth of up to 90 mm and deeper. The effect evaluation of addition energy in the common point of the lasers beams demonstrate that to achieve the desired temperature of the tissue up to 43-440C to a depth of 9 cm is sufficient 5 ÷ 6 lasers with power emission 4W to wavelength of 808nm. In order to avoid the burning of the surface tissues of the body is necessary to ensure the power flow density not higher than 200mW/cm2, which requires collimators or they're systems that provide a uniform flare by each laser corresponding to the area (20cm2, in case of 4-watt lasers).