Endoscopic instrument with improved closure window
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United States of America Patent
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Jul 16, 1996
Grant Date -
N/A
app pub date -
Jun 27, 1994
filing date -
Jun 26, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An endoscopic instrument includes an elongate shaft with an optical system arranged therein. The shaft is closed off at least its distal end by a window which is firmly and tightly connected to the shaft. The closure window is constructed of spinel or yttrium-aluminum-garnet. The spinel may be cubic monocrystalline spinel or polycrystalline spinel, and the yttrium-aluminum-garnet may be undoped or neodymium-doped. Similar closure windows of the same materials may be provided at other openings in the endoscope shaft, such as a proximal end ocular or eyepiece or a lateral light guide window. The closure window may optionally be in the form of a lens to function as part of the optical system.
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