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Photodynamic therapy for treating age-related macular degeneration
Photodynamic therapy for treating age-related macular degeneration
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机译：光动力疗法治疗老年性黄斑变性
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摘要
A system for treating age-related macular degeneration includes an agent for marking a region of diseased tissue. Additionally, the system includes a femtosecond laser source for generating a laser beam. Further, an optical assembly focuses the laser beam to a plurality of focal points in the region of diseased tissue, each focal point having a volumetric measurement of about 2 mumx2 mumx20 mum. Due to an increased concentration of photons in the relatively small volume of each focal point, two photons interact with a single molecule of the marking agent, within a very short interval of time (e.g. 10SUP-13 /SUPsec). The resultant excited electron state (e.g. 3 eV) is sufficient to induce the marking agent to convert oxygen in a manner that causes the oxygen to kill the diseased tissue.
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