Method and apparatus for treating dermal melasma
US11083523B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 2014 |
| Grant date | Aug 10, 2021 |
| Priority date | — |
| Expiry date | Oct 19, 2034 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2018/20361
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Exemplary methods and devices can be provided for improving the appearance of dermal melasma. This can be done, e.g., focusing electromagnetic radiation having a wavelength between about 600 nm and 850 nm into a region of the pigmented dermal tissue at a depth between about 150 and 400 microns, using a lens arrangement having a large numerical aperture between about 0.5 and 0.9. The exemplary local dwell time of the focused radiation can be less than a few milliseconds, and a local fluence provided in the focal region can be between about 50 and 500 J/cm2. The focal region can be scanned through the dermal tissue at speeds on the order of a few cm/s. Such parameters can provide sufficient energy absorption by pigmented cells in the dermis to disrupt them while avoiding damage to the overlying tissue and unpigmented dermal tissue.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.