# US 5,200,819 A · Multi-dimensional imaging system for endoscope

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- Number: US 5,200,819 A
- Document ID: US5200819A
- Status: Granted
- Kind: A
- Application number: 07/835,761
- Filed: 1992-02-13
- Granted: 1993-04-06
- Earliest claimed: 1988-05-27
- Assignees: University of Connecticut
- Inventors: Sol Nudelman; Donald R. Ouimette
- Web page: https://patentgrep.com/patent/US5200819A

## CPC

- H10F 77/957: {for position-sensitive photodetectors, e.g. lateral-effect photodiodes or quadrant photodiodes}
- A61B 1/0008: {characterised by distal tip features}
- A61B 1/00172: {with means for scanning}
- A61B 1/00193: {adapted for stereoscopic vision}
- A61B 1/042: {characterised by a proximal camera, e.g. a CCD camera}
- A61B 18/24: with a catheter (A61B18/26, A61B18/28 take precedence)
- G02B 6/4296: {coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources}
- G02B 23/2469: {using optical fibres}
- G02B 23/26: using light guides {(for illumination G02B23/2469)}
- A61B 2018/20351: {Scanning mechanisms}
- A61B 2018/20355: {Special scanning path or conditions, e.g. spiral, raster or providing spot overlap}
- A61B 2018/205: {with electronic means, e.g. acousto-optic}
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An image acquisition system employs elemental and/or lateral effect detectors in conjunction with an optical scanner which provides a beam of radiation tracing out a raster to illuminate an object. The system generates an electrical signal which is processed to generate data indicative of a two or three dimensional image of an object, in spectrally selective monochromatic wavelengths or broadband regions. An endoscope is designed to make particular use of this image generating system. The image system includes a digital system able to provide a data matrix of two and three dimensional coordinates and the radiation intensity at each of the coordinates as well as spectral dependent image processing, display and archival storage.

## Claims

### Claim 1

An endoscope adapted for operation in association with optical scanner means which generates radiation tracing out a raster comprising;
probe means for forming a flexible tubular member having a proximal end and a distal end;
first optical cable means disposed in said probe means comprising a bundle of coherent flexible optical fibers forming a first optical cable extending between a proximal end surface and a distal end surface;
photodetector means comprising a photodetector for generating an electrical signal having an instantaneous value proportional to the quantity of light impinging said photodetector;
processor means communicating with said photodetector means for generating a signal indicative of a multi-dimensional image of said object,
so that a raster from said scanner applied at said proximal end of said probe means is projected through said distal end surface of said optical channel for illumination of the object to be examined and radiation reflected from the object impinges said photodetector means wherein said processor generates signals indicative of a depth image of said object.

### Claim 2 (depends on 1)

The endoscope of claim 1 wherein said photodetector is a lateral effect diode.

### Claim 3 (depends on 2)

The endoscope of claim 2 further comprising at least one additional elemental photodetector communicating with the reflected radiation.

### Claim 4 (depends on 1)

The endoscope of claim 1 wherein said processor means further comprises matrix means for generating a matrix having a three dimensional coordinate and an associated radiation each pixel of said raster.

### Claim 5 (depends on 1)

The endoscope of claim 1 wherein said photodetector is an elemental photodetector.