Excimer laser phototherapy for the dissolution of abnormal growth
US4686979A · kind A · utility
168Cited by
7References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1985 |
| Grant date | Aug 18, 1987 |
| Priority date | — |
| Expiry date | Feb 19, 2005 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2009/00863
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.