Endoscopic instrument with improved closure window

Details Endoscopic instrument with improved closure window Endoscopic instrument with improved closure window

1994-06-27

1996-07-16

Apley, Richard J.

Surgery

Endoscope

Having imaging and illumination means

600133, A61B 100

Patent

active

055362443

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.

REFERENCES:
patent: 3417745 (1968-12-01), Sheldon
patent: 4170997 (1979-10-01), Pinnow et al.
patent: 4583539 (1986-04-01), Karlin et al.
patent: 4677471 (1987-06-01), Takamura et al.
patent: 4779130 (1988-10-01), Vabe
patent: 4779613 (1988-10-01), Hashiguchi et al.
patent: 4905082 (1990-02-01), Nishigaki et al.
patent: 4942867 (1990-07-01), Takahashi et al.
patent: 5056902 (1991-10-01), Chinnock et al.

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