Importance

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Abstract

Phototherapeutic instruments are disclosed having integral stopper devices which limit the penetration of an optical fiber during tissue penetrating phototherapy. In one preferred embodiment, a fluted outer sheath is disposed about an internal optical fiber. The fluted sheath is configured to expand during penetration of the optical fiber into a patient's tissue. As the fluted elements expand, the present a much larger cross-sectional area which resists further penetration of the instrument beyond a predetermined desirable distance. The invention is useful in limiting an optically-transmissive fiber's penetration and, thereby, reduce the possibility of perforation of a body lumen or organ. The invention is particularly useful in placing a ablative laser radiation device into the ventricle of the heart when performing arrhythmia-correcting laser ablative procedures or when revascularizing the heart percutaneously. The stopper devices limit penetration and stabilize the optically-transmissive tip during such procedures.

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First Claim