Salutaris Medical Devices, Inc.

The University of Arizona

The United States of American as Represented by the U.S. Government

Thomas C Cetas

Laurence J Marsteller

Russell J Hamilton

Wendell Lutz

Samuel S Hyman

Timothy D Shriver

Methods and devices for minimally-invasive delivery of radiation to the eye (such as the posterior portion of the eye) including cannula systems with multiple treatment positions and/or multiple channels in the distal tip of the cannula systems. The channels can accommodate emanating sources and exposing a target at various treatment positions. The emanating sources may be annulus-shaped.

Methods and devices for minim ally-invasive delivery of radiation to the eye

Methods and devices for minimally-invasive delivery of radiation to the eye

This invention relates to the use of a birefringent crystal as the sensing element in a probe thermometer constructed of certain basic optical components utilized in three separate modes. Thus, all of the modes of the invention are directed to a probe thermometer which uses the temperature dependence of the birefringence of certain single crystals as the temperature sensitive parameter. One such crystal is a Y-cut single crystal of LiTaO.sub.3. Alternative crystals having adequate sensitivity in the desired temperature range may be constructed from LiNbO.sub.3 or BaTiO.sub.3. Polarized light propagates through the crystal in two modes, the ordinary ray and the extraordinary ray, which have indices of refraction n.sup.o and n.sup.e. For LiTaO.sub.3 at room temperature, n = 2.2, B = n.sup.e - n.sup.o = 0.004, and dB/dT = 4.4 .times. 10.sup.-5 /.degree. C. The intensity of light passed through a sandwich of aligned sheet polarizer, crystal, and optical analyzer is a function of B and hence also is temperature dependent. A thermometer probe is constructed by bonding this sandwich to a bundle of optical fibers along with a dielectric mirror so that the sensor will be at the probe tip. The probe has been constructed for use in the presence of intense electromagnetic fields and also designed to eliminate the possible hazard of an electrical leakage back to the subject.

Birefringent crystal thermometer

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Tucson, AZ, United States of America

Thomas C Cetas