Surgery – Truss – Perineal
Patent
1979-04-16
1981-06-09
Howell, Kyle L.
Surgery
Truss
Perineal
356383, 356 1, 33125A, A61B 106
Patent
active
042718295
ABSTRACT:
This invention relates to endoscopes of the kind incorporating a device for measuring the distance between the subject and the objective or objective lens of the optical system of the endoscope.
According to the invention the measuring device comprises means for passing two thin and visible light rays along the longitudinal direction of the endoscope, and reflector means for deflecting these light rays at the distal end of the endoscope next to the objective lens of the optical system. The reflector means are spaced apart from each other to form measuring rays the first one of said rays being deflected by deflector means into a fixed and approximately parallel position with respect to the longitudinal axis of the objective lens and the second one of said rays being deflected by a rotatable reflector in a plane of the fixed deflection ray with a variable angle. A rotatable scale is provided at the proximal end of the endoscope to read off the angle from an angular position referred to the longitudinal axis of the objective lens and serving as zero position, until it intersects the fixed measuring ray in the plane of the subject.
REFERENCES:
patent: 3817631 (1974-06-01), Kawahara
patent: 3817635 (1974-06-01), Kawahara
patent: 3819267 (1974-06-01), Kawahara
patent: 3873211 (1975-03-01), Watson
Howell Kyle L.
Richard Wolf GmbH
Rose Arthur S.
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