| 摘要 |
The invention relates to a device for protecting a skin area against light when detecting and/or treating skin disorders, especially cancer and its preliminary stages, including application of compounds and/or compositions t o the skin, in connection with which a photoreactive substance appears in the skin area. The device comprises an opaque foil (1) forming a cavity (4) relative to the skin and having edges (3) engaging the skin, the width of th e edges (3) being determined by formula (I), wherein m = the width of the edge , .delta. = the penetration depth of the light in the skin, ln = the natural logarithm, t = the time of the effect of the light, I0 = the luminous intensity at the skin surface, and Ddiffused = the diffused energy dose whic h is allowed to reach the skin area concerned. |
