Excimer laser phototherapy for the dissolution of abnormal growth
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United States of America Patent
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Aug 18, 1987
Issued Date -
N/A
app pub date -
Feb 19, 1985
filing date -
Jan 9, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Removal of abnormal human tissue with reduced thermal damage is achieved by selecting a laser having a wavelength in the order of 290-400 nm, orienting a laser-transmitting glass member toward the abnormal tissue and directing the laser through the glass member at power densities, pulse rates, and times sufficient to cause multiphoton absorption and bond breaking by Coulomb repulsion rather than thermal destruction. The glass member may include a laser beam concentrator provided by a lens or cone at the tissue-treatment end to increase the beam energy per unit area and reduce the treatment area.
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