Surgery – Truss – Perineal
Patent
1985-09-30
1987-01-06
Coven, Edward M.
Surgery
Truss
Perineal
A61B 106
Patent
active
046338551
ABSTRACT:
An endoscope apparatus includes an ultrasonic transducer disposed at the distal end portion of an endoscope. The ultrasonic wave transmission/reception time of the ultrasonic transducer is measured by a time counter. The measured time from the time counter and the velocity of propagation of ultrasonic wave are operated on by a calculator to calculate the distance between the distal end portion and a subject. The distance and the view angle of an observation optical system are operated on by a calculator, the ratio between the size of an image in the field of view of the observation optical system and the size of the subject is calculated, and the scale of a scale display panel disposed inside the field of view of the optical system is indicated in accordance with such ratio. The graduations of the scale are variable as a function of said calculated ratio.
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"How Things Work", part 1, 1979, Granada, pp. 150-151, London, Focal Distance and Size of Image.
Coven Edward M.
Hindenburg Max F.
Olympus Optical Co,. Ltd.
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