Tungsten eye shields for electron beam treatment
AssigneeBoard of Regents, The University of Texas System
InventorsAlmon S. Shiu, Samuel S. Tung, Robert J. Gastorf
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Abstract
An eye shield for use in electron beam treatment of eyelid tumors. The use of tungsten provides an eye shield which is sufficiently thin to allow insertion over the eye and underneath the eyelid while providing sufficient shielding to protect against ocular damage when electron beams of up to nine million electron volts are used. A coating applied to the outer surface of the shield prevents burning of the tissues at the eyelid-shield interface resulting from backscattered electrons.
Claims16
An eye shield for insertion between an eye and an eyelid, comprising a tungsten body having a curved inner surface and a curved outer surface, the body being sufficiently thick to attenuate electron beams in the energy range of six to nine million electron volts such that the tolerance doses to different optic structures within an eye are not exceeded and the body being sufficiently thin such that the shield can be inserted between an eye and an eyelid.
An eye shield for insertion between an eye and an eyelid, comprising a tungsten body having a curved inner surface and a curved outer surface, the body being sufficiently thick to attenuate electron beams in the energy range of six to nine million electron volts such that the tolerance doses to different optic structures within the eye are not exceeded and the body being sufficiently thin such that the shield can be inserted between an eye and an eyelid, and where the outer surface also comprises a coating over the tungsten body so that the electron backscatter rate is reduced.
Dependencies are inferred from the claim text.