# Patent

## Title
Multi-viewing element endoscope

## Abstract

There is provided herein a tip section of a multi-viewing element endoscope, the tip section comprising: two or more side-pointing viewing elements positioned at or in proximity to a distal end of said tip section, wherein each of said two or more side-pointing viewing elements having a discrete illuminator associated therewith, wherein the field of view provided by the two or more side-pointing viewing elements covers a front and side views; a working channel configured for insertion of a surgical tool; and a pathway fluid injector for inflating and/or cleaning a body cavity into which the endoscope is inserted.

## Background
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part (CIP) of U.S. patent application No. 13/119,032, filed Jul. 15, 2011 which is a national phase application with the U.S. Patent and Trademark Office of International Patent Application No. PCT/IL2010/000476, filed Jun. 16, 2010, which claims the benefit of U.S. Provisional Patent Application No. 61/218,085, filed Jun. 18, 2009 and entitled “Endoscope Having Multiple Fields of View”, which are incorporated herein by reference in their entirety.


FIELD
Embodiments of the disclosure relate to a multi-viewing elements endoscope.
BACKGROUND
Endoscopes have attained great acceptance within the medical community, since they provide a means for performing procedures with minimal patient trauma, while enabling the physician to view the internal anatomy of the patient. Over the years, numerous endoscopes have been developed and categorized according to specific applications, such as cystoscopy, colonoscopy, laparoscopy, upper GI endoscopy and others. Endoscopes may be inserted into the body's natural orifices or through an incision in the skin.
An endoscope is usually an elongated tubular shaft, rigid or flexible, having a video camera or a fiber optic lens assembly at its distal end. The shaft is connected to a handle, which sometimes includes an ocular for direct viewing. Viewing is also usually possible via an external screen. Various surgical tools may be inserted through a working channel in the endoscope for performing different surgical procedures.
Among the disadvantages of existing endoscopes, are their limited field of view and their complicated packing of all the required elements, such as electronics and together with fluid carrying elements in the small sized endoscope tip section.
There is thus a need in the art for endoscopes, such as colonoscopies, that allow a broader field of view and also enable the function of all necessary elements in the tip section.
The foregoing examples of the related art and limitations related therewith are intended to be illustrative and not exclusive. Other limitations of the related art will become apparent to those of skill in the art upon a reading of the specification and a study of the figures.
SUMMARY
The following embodiments and aspects thereof are described and illustrated in conjunction with systems, tools and methods which are meant to be exemplary and illustrative, not limiting in scope.
There is provided, according to some embodiments, a tip section of a multi-viewing elements endoscope, the tip section comprising: a front-pointing viewing element and a discrete front illuminator associated therewith; a front fluid injector configured for cleaning at least one of said front-pointing viewing element and/or said discrete front illuminator; a side-pointing viewing element; a working channel configured for insertion of a surgical tool; and a pathway fluid injector for inflating and/or cleaning a body cavity into which the endoscope is inserted.
According to some embodiments, the term “viewing element” may include a camera. According to additional or alternative embodiments, the term “viewing element” may include a fiber optic lens assembly. The fiber optic lens assembly may include one or more lenses located at the tip section of the endoscope and fiber optic associated to the one or more lenses and configured to receive light from an area of interest (tested/examined area, such as a colon of a subject) and transfer the received light to a (video) camera which may be located in the handle of the endoscope or in the console associated with the endoscope.
There is provided, according to some embodiments, a multi-viewing element endoscope comprising: an elongated shaft terminating with a tip section turnable by way of a bending section, wherein said tip section comprises: a front-pointing viewing element and a discrete front illuminator associated therewith; a front fluid injector configured for cleaning at least one of said front-pointing viewing element and/or said discrete front illuminator; a side-pointing viewing element; a working channel configured for insertion of a surgical tool; and a pathway fluid injector for inflating and/or cleaning a body cavity into which the endoscope is inserted.
The tip section may further include a discrete side illuminator associated with side-pointing viewing element. The tip section may further include a side fluid injector configured for cleaning said side-pointing viewing element and/or said discrete side illuminator.
There is provided, according to an embodiment, a multi-viewing element endoscope comprising: an elongated shaft terminating with a tip section turnable by way of a bending section, wherein said tip section comprises: a front-pointing viewing element and a discrete front illuminator associated therewith; a front fluid injector configured for cleaning at least one of said front-pointing viewing element and said discrete front illuminator; a side-pointing viewing element and a discrete side illuminator associated therewith; a side fluid injector configured for cleaning at least one of said side-pointing viewing element and said discrete side illuminator; a working channel configured for insertion of a surgical tool; and a pathway fluid injector for inflating and/or cleaning a body cavity into which the endoscope is inserted.
There is further provided, according to an embodiment, a multi-viewing element endoscopy system comprising: an endoscope comprising a handle and an elongated shaft terminating with a tip section turnable by way of a bending section, wherein said tip section comprises: a front-pointing viewing element and a discrete front illuminator associated therewith, a front fluid injector configured for cleaning at least one of said front-pointing viewing element and said discrete front illuminator, a side-pointing viewing element and a discrete side illuminator associated therewith, a side fluid injector configured for cleaning at least one of said side-pointing viewing element and said discrete side illuminator, a working channel configured for insertion of a surgical tool, and a pathway fluid injector for inflating and/or cleaning a body cavity into which the endoscope is inserted; a controller connected to said handle of said endoscope by way of a utility cable; and a display connected to said controller and configured to display video streams received from said front and side-pointing viewing elements.
In some embodiments, the front-pointing viewing element, the side-pointing viewing element or both comprise fiber optic lens assembly. In some embodiments, the front-pointing viewing element comprises a camera and the side-pointing viewing element comprises a fiber optic lens assembly. In some embodiments, the front-pointing viewing element comprises a fiber optic lens assembly and the side-pointing viewing element comprises a camera.
In some embodiments, the fiber optic lens assembly is configured to receive light from an area of interest and to transfer the received light to a camera located outside said tip section. The camera may be located in a handle of said endoscope or in a console associated with said endoscope.
In some embodiments, said front-pointing viewing element and said side-pointing viewing element are pointing at directions essentially perpendicular to one another.
In some embodiments, said front-pointing viewing element and said side-pointing viewing element are pointing approximately 100 to 145 degrees relative to one another.
In some embodiments, a center of said side-pointing viewing element is positioned approximately 7 to 11 millimeters from a distal end of said tip section.
In some embodiments, each of said discrete front and side illuminators comprises one or more light-emitting diodes (LED).
In some embodiments, at least one of said discrete front and side illuminators is configured to emit white light.
In some embodiments, at least one of said discrete front and side illuminators is configured to emit ultraviolet light.
In some embodiments, at least one of said discrete front and side illuminators is configured to emit infrared light.
In some embodiments, at least one of said discrete front and side illuminators is configured to emit near-infrared light.
In some embodiments, said discrete front and side illuminators are configured to emit light in different wavelengths.
In some embodiments, said tip section further comprises an additional discrete front illuminator configured to emit light having a different wavelength than said discrete front illuminator.
In some embodiments, said additional discrete front illuminator and said discrete front illuminator are configured to simultaneously emit light, each at a different wavelength.
In some embodiments, said tip section further comprises an additional discrete side illuminator configured to emit light having a different wavelength than said discrete side illuminator.
In some embodiments, said additional discrete side illuminator and said discrete side illuminator are configured to simultaneously emit light, each at a different wavelength.
In some embodiments, any one of the front-pointing camera and/or the side-pointing camera comprises a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS) image sensor.
In some embodiments, said front and side fluid injectors are connected to a same fluid supply channel.
In some embodiments, said pathway fluid injector is connected to said fluid supply channel, together with said front and side fluid injectors.
In some embodiments, at least one of said front and side-pointing viewing elements comprises a lens assembly providing a field of view of 90 degrees or more.
In some embodiments, at least one of said front and side-pointing viewing elements comprises a lens assembly providing a field of view of 120 degrees or more.
In some embodiments, at least one of said front and side-pointing viewing elements comprises a lens assembly providing a field of view of 150 degrees or more.
In some embodiments, said front-pointing viewing element comprises a lens assembly providing a focal length of approximately 3-100 millimeters.
In some embodiments, said side-pointing viewing element comprises a lens assembly providing a focal length of approximately 2-33 millimeters.
In some embodiments, said tip section further comprises an opposite side-pointing viewing element pointing at a direction essentially opposite to said side-pointing viewing element.
In some embodiments, said tip section further comprises a perpendicular side-pointing viewing element pointing at a direction essentially perpendicular to said side-pointing viewing element.
In some embodiments, said endoscope is a colonoscope.
In some embodiments, fields of view of said front-pointing viewing element and side-pointing viewing element are at least partially overlapping, such that an object of interest viewed via said side-pointing viewing element remains in the field of view of said side-pointing viewing element while said tip section is being turned towards the object, and at least until the object becomes visible through said front-pointing viewing element.
In some embodiments, said utility cable comprises: a fluid channel for providing a fluid to at least one of said injectors, a data cable for receiving video signals from said front and side-pointing cameras, a power cable for providing electrical power to said front and side-pointing cameras and to said discrete front and side illuminators, an optic fiber or any combination thereof. According to alternative embodiments, any channel, fiber and/or cable can be driven independently.
In some embodiments, said controller is configured to process and combine video signals received from the cameras (for example, front and side-pointing cameras) into a single panoramic video view.
In addition to the exemplary aspects and embodiments described above, further aspects and embodiments will become apparent by reference to the figures and by study of the following detailed description.



BRIEF DESCRIPTION OF THE FIGURES
Exemplary embodiments are illustrated in referenced figures. Dimensions of components and features shown in the figures are generally chosen for convenience and clarity of presentation and are not necessarily shown to scale. It is intended that the embodiments and figures disclosed herein are to be considered illustrative rather than restrictive. The figures are listed below:
FIG. 1 shows a cross sectional view of a prior art endoscope;
FIG. 2 shows a cross section of a multi-camera endoscope, according to some embodiments;
FIG. 3 shows a perspective view of a multi-camera endoscope, according to some embodiments;
FIG. 4 shows a cross-sectional view of a bending section of a multi-camera endoscope, according to some embodiments;
FIG. 5 shows a cross-sectional view of a tip section of a multi-camera endoscope, according to some embodiments;
FIG. 6 shows a semi-pictorial view of a multi-camera endoscopy system, according to some embodiments;
FIGS. 7A-D show perspective views of multiple tip section configurations, according to some embodiments; and
FIG. 8 shows a perspective view of a multi-viewing elements endoscope, according to some embodiments.



DETAILED DESCRIPTION
An aspect of some embodiments relates to an endoscope having a tip section equipped with two or more viewing elements. According to one embodiment, one of the viewing elements is positioned at a distal end of the tip section and points forward, and the remaining viewing element(s) is positioned further back in the tip section, and points sideways.
According to another embodiment, one of the viewing elements is positioned at a distal (front) end surface of the tip section and points forward, and the remaining viewing element(s) is positioned further back in the tip section, and points sideways.
This configuration, advantageously, may allow for a higher rate of detection, compared to conventional configurations, of pathological objects that exist in the body cavity in which the endoscope operates.
The cameras and optionally other elements that exist in the tip section (such as a light source, a working channel, a fluid injector and/or the like) are uniquely scaled, configured and packaged so that they fit within the minimalistic space available inside the tip section, while still providing valuable results.
Reference is now made to FIG. 1, which shows a cross sectional view of a prior art endoscope, in this example a colonoscope 100, used within a colon 120 of a patient. The human colon includes a series of annular muscles which appear in this figure as folds 122 protruding from an inner surface 124 of the colon.
Endoscope 100 includes a front-pointing camera 104 positioned at a distal end 102 of the colonoscope. Camera 104 typically has a wide field of view 106. When endoscope 100 is used within a body cavity such as colon 120, the operator advances the endoscope 100 while viewing images (commonly a video feed) transmitted by camera 104. When a polyp, such as polyp 110 or 112 is discovered on a wall of colon 120, the operator may insert a surgical tool (not shown) through a working channel 105 to remove, treat and/or extract a sample of the polyp or its entirety for biopsy.
However, in some cases, a polyp, such as polyp 114 may be located on an inner side of a fold 126, such that it is hidden from the field of view 106 of camera 104. This phenomena is said to greatly contribute to the common statistics, according to which as many as 12-24% of polyps are missed during colonoscopy. Missing polyps, or a “false negative” diagnosis, may result in late discovery of cancer.
Reference is now made to FIG. 2, which shows a cross section of a multi-camera endoscope 200, according to an embodiment. Endoscope 200 may include an elongated shaft 203 (not fully shown) terminating with a tip section 202 which is turnable by way of a bending section 204. Advantageously, tip section may include a front-pointing camera 206 as well as a side-pointing camera 210. While front-pointing camera 206 may be able to detect, based on its field of view 208, polyps such as polyps 218 and 220, side-pointing camera 210 may be further able to detect polyps which are normally hidden from the front-pointing camera, such as polyp 216. By rotating endoscope 200 around its longitude, side-pointing camera 210 may detect polyps circumferentially, 360 degrees around the endoscope. This may enable the detection of polyps such as a polyp 222, which is, similar to polyp 216, located on an inner side of a fold. In other configurations (not shown), two or more side-pointing cameras may exist in the tip section, each having a different (or an overlapping, to some degree) field of view.
Advantageously, the fields of view of front-pointing camera 206 and side-pointing camera 210 are at least partially overlapping, such that an object of interest (such as a polyp or another pathology) viewed via the side-pointing camera remains in the field of view of this camera while the tip section is being turned towards the object, and at least until the object becomes visible through the front-pointing camera. This may be beneficial when a polyp is discovered by side-pointing camera 210, and the operator desires to perform a surgical operation on that polyp using a surgical tool inserted through a working channel (not shown in the figure) which has an opening in a distal end surface of tip section 202, next to front-pointing camera 206. For performing the surgical operation, tip section 202 may need to be turned towards the polyp. It may greatly assist the operator if the fields of view of front-pointing camera 206 and side-pointing camera 210 have some overlap, so that the polyp remains in sight throughout the turning of the tip section and the operator does not get disoriented.
Reference is now made to FIG. 3, which shows a perspective view of a multi-camera endoscope 300 in more detail, according to an embodiment. Endoscope 300 may include an elongated shaft (not shown), a bending section (partially shown) 302 and a tip section 304 which terminates the endoscope.
Bending section 302 may include a plurality of links, such as links 302a-c, which enable the turning of tip section 304 in different directions. In a different configuration (not shown), a bending section may be constructed differently, as long as it enables the turning of the tip section in different directions. Bending section 302 may be covered with an elastic sheath (not shown), which may also extend to cover the elongated shaft.
Tip section 304 may include therein a front-pointing camera 304 which may capture images through a hole in a distal end surface 306 of the tip section. A discrete front illuminator 308, which is optionally a light-emitting diode (LED), may be associated with front-pointing camera 304 and used for illuminating its field of view through another hole in distal end surface 306. The LED may be a while light LED, an infrared light LED, a near infrared light LED or an ultraviolet light LED. The term “discrete”, in regard to front illuminator 308, may refer to an illumination source which generates light internally—in contrast to a non-discrete illuminator which may be, for example, a fiber optic merely transmitting light generated remotely. In a different configuration (not shown), two or more discrete front illuminators may be present in the tip section, such as for supplying overall stronger illumination and/or for increasing the angular coverage of the illumination. These two or more discrete front illuminators may be located next to one another so that they share a same protective window on the distal end surface of the tip section.
A front fluid injector 310 may be used for cleaning at least one of front-pointing camera 304 and discrete front illuminator 308. Front fluid injector 310 may be slightly elevated from distal end surface 306, to enable it to inject fluid, from its side 310a, onto front-pointing camera 304 and discrete front illuminator 308. Front fluid injector 310 may be configured to inject fluids such as water, air and/or the like.
Distal end surface 306 may further include a hole defining a working channel 312. Working channel 312 may be a hollow tube configured for insertion of a surgical tool to operate on various tissues. For example, miniature forceps may be inserted through working channel 312 in order to remove a polyp or sample of which for biopsy.
A pathway fluid injector 314, defined by another hole in distal end surface 306, may be used for inflating and/or cleaning the body cavity into which endoscope 300 is inserted. Inflation may be performed by flowing air or another gas through pathway fluid injector 314, and may be beneficial for cases in which the body cavity, such as the colon, is shriveled or otherwise does not allow for efficient inspection. Cleaning may be achieved, for example, by injecting a liquid, such as water or saline, on an unclean area of the body cavity. Furthermore, pathway fluid injector 314 (or a different tube, not shown) may be used for applying suction, in order to evacuate various liquids and/or solids which exist in the body cavity and interfere with the inspection.
Tip section 304 may further include therein a side-pointing camera 316 which may capture images through a hole in a cylindrical surface 305 of the tip section. A discrete side illuminator 322, which is optionally similar to discrete front illuminator 308, may be associated with front-pointing camera 304 and used for illuminating its field of view through another hole in cylindrical surface 305. In a different configuration (not shown), two or more discrete side illuminators may be present in the tip section, such as for supplying overall stronger illumination and/or for increasing the angular coverage of the illumination. These two or more discrete side illuminators may be located next to one another so that they share a same protective window on the cylindrical surface of the tip section.
A side fluid injector 320 may be used for cleaning at least one of side-pointing camera 304 and discrete side illuminator 322. In order to prevent tissue damage when cylindrical surface 305 of tip section 304 contacts a side wall of the body cavity, side fluid injector 320 and side-pointing camera 316 may be located in a depression 318 in the cylindrical surface. This way, side fluid injector 320 may be elevated from depression 318 but still not significantly protrude from the level of cylindrical surface 305. The elevation of side fluid injector 320 may enable it to inject fluid, from its side 320a, onto side-pointing camera 316. In an alternative configuration (not shown), one or more discrete side illuminators may also be included in the depression, so that fluid injected from the side fluid injector may reach them. In yet another configuration (not shown), a side-pointing camera, one or more side illuminators and a side fluid injector may not be located in a depression, but rather be on essentially the same level as the cylindrical surface of the tip section.
Reference is now made to FIG. 4, which shows a cross-sectional view of a bending section 400 of a multi-camera endoscope, such as multi-camera endoscope 300 of FIG. 3. A plurality of steering cable eyes, such as four eyes 408, are positioned on the internal walls of bending section 400. Through these eyes 408, steering cables are threaded, to enable the maneuvering of bending section 400. Bending section 400 may also include a working channel 402, through which surgical tools may be inserted, a fluid channel 406, through which fluids and/or liquids may be infused, and an electrical channel 404, through which a plurality of electrical cables may be threaded, for transmitting video signals from the cameras and for supplying power to the cameras and the discrete illuminators.
For simplicity of presentation, FIG. 4 only shows a single working channel 402, although in a different configuration (not shown), more than one working channel may exist, to enable the insertion of multiple surgical tools simultaneously. Similarly, only one fluid channel 406 is shown, although in a different configuration (not shown) more than one fluid channel may be used, such as for separately feeding at least one of a front fluid injector, a side fluid injector and/or a pathway fluid injector, as well as for separately providing suction through the pathway fluid injector. Additionally, FIG. 4 shows only a single electrical channel 404, but in other configurations (not shown), one or more of the electrical cables threaded through the elongated shaft and/or the bending section may be separated into a plurality of tubes, for example in order to distance cables causing magnetic induction from cables which may be influenced by this phenomena.
Reference is now made to FIG. 5, which shows a cross-sectional view of a tip section 500 of a multi-camera endoscope, according to an embodiment. Tip section 500 may include a front-pointing image sensor 502, such as Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS) image sensor. Front-pointing image sensor 502 may be mounted on an integrated circuit board 506, which may be rigid or flexible. Integrated circuit board 506 may supply front-pointing image sensor 502 with the necessary electrical power, and may derive still images and/or video feeds captured by the image sensor. Integrated circuit board 506 may be connected to a set of electrical cables (not shown) which may be threaded through an electrical channel running through the elongated shaft of the endoscope. Front-pointing image sensor 502 may have a lens assembly 504 mounted on top of it and providing the necessary optics for receiving images. Lens assembly 504 may include a plurality of lenses, static or movable, which may provide a field of view of at least 90 degrees and up to essentially 180 degrees. Lens assembly 504 may provide a focal length of about 3 to 100 millimeters. Front-pointing image sensor 502 and lens assembly 504, with or without integrated circuit board 506, may be jointly referred to as a “front pointing camera”.
One or more discrete front illuminators 508 may be placed next to lens assembly 504, for illuminating its field of view. Optionally, discrete front illuminators 508 may be attached to the same integrated circuit board 506 on which front-pointing image sensor 502 is mounted (this configuration is not shown).
Tip section 500 may include a side-pointing image sensor 512, such as Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS) image sensor. Front-pointing image sensor 502 may be mounted on an integrated circuit board 516, which may be rigid or flexible. Integrated circuit board 516 may supply side-pointing image sensor 512 with the necessary electrical power, and may derive still images and/or video feeds captured by the image sensor. Integrated circuit board 516 may be connected to a set of electrical cables (not shown) which may be threaded through an electrical channel running through the elongated shaft of the endoscope.
Side-pointing image sensor 512 may have a lens assembly 514 mounted on top of it and providing the necessary optics for receiving images. Lens assembly 514 may include a plurality of lenses, static or movable, which may provide a field of view of at least 90 degrees and up to essentially 180 degrees. Lens assembly 514 may provide a focal length of about 2 to 33 millimeters. Side-pointing image sensor 512 and lens assembly 514, with or without integrated circuit board 516, may be jointly referred to as a “side pointing camera”.
One or more discrete side illuminators 518 may be placed next to lens assembly 514, for illuminating its field of view. Optionally, discrete front illuminators 518 may be attached to the same integrated circuit board 516 on which side-pointing image sensor 512 is mounted (this configuration is not shown).
In another configuration (not shown), integrated circuit boards 506 and 516 may be a single integrated circuit board on which both front and side-pointing image sensors 502 and 512 are mounted. For this purpose, the integrated circuit board may be essentially L-shaped.
Front and side-pointing image sensors 502 and 512 may be similar or identical in terms of, for example, field of view, resolution, light sensitivity, pixel size, focal length, focal distance and/or the like.
Optionally, side-pointing image sensor 512 and lens assembly 514 are advantageously positioned relatively close to the distal end surface of tip section 500. For example, a center of the side-pointing camera (which is the center axis of side-pointing image sensor 512 and lens assembly 514) is positioned approximately 7 to 11 millimeters from the distal end of the tip section. This is enabled by an advantageous miniaturizing of the front and side-pointing cameras, which allows for enough internal space in the tip section for angular positioning of the cameras without colliding.
Reference is now made to FIG. 6, which shows a semi-pictorial view multi-camera endoscopy system 600. System 600 may include a multi-camera endoscope 602, such as the endoscope of FIGS. 2, 3, 4 and/or 5. Multi-camera endoscope 602 may include a handle 604, from which an elongated shaft 606 emerges. Elongated shaft 606 terminates with a tip section 608 which is turnable by way of a bending section 610. Handle 604 may be used for maneuvering elongated shaft 606 within a body cavity; the handle may include one or more knobs and/or switches 605 which control bending section 610 as well as functions such as fluid injection and suction. Handle 604 may further include a working channel opening 612 through which surgical tools may be inserted.
A utility cable 614 may connect between handle 604 and a controller 616. Utility cable 614 may include therein one or more fluid channels and one or more electrical channels. The electrical channel(s) may include at least one data cable for receiving video signals from the front and side-pointing cameras, as well as at least one power cable for providing electrical power to the cameras and to the discrete illuminators.
Controller 616 may govern power transmission to the endoscope's 602 tip section 608, such as for the tip section's cameras and illuminators. Controller 616 may further control one or more fluid, liquid and/or suction pump which supply corresponding functionalities to endoscope 602. One or more input devices, such as a keyboard 618, may be connected to controller 616 for the purpose of human interaction with the controller. In another configuration (not shown), an input device, such as a keyboard, may be integrated with the controller in a same casing.
A display 620 may be connected to controller 616, and configured to display images and/or video streams received from the cameras of multi-camera endoscope 602. Display 620 may further be operative to display a user interface for allowing a human operator to set various features of system 600.
Optionally, the video streams received from the different cameras of multi-camera endoscope 602 may be displayed separately on display 620, either side-by-side or interchangeably (namely, the operator may switch between views from the different cameras manually). Alternatively, these video streams may be processed by controller 616 to combine them into a single, panoramic video frame, based on an overlap between fields of view of the cameras.
In another configuration (not shown), two or more displays may be connected to controller 616, each for displaying a video stream from a different camera of the multi-camera endoscope.
Reference is now made to FIGS. 7A-D, in which multiple configurations 700, 720, 740 and 760 of a tip section are shown.
In configuration 700, a front-pointing camera 702 and a side-pointing camera 704 are essentially perpendicular to one another, and have, correspondingly, perpendicular fields of view.
In configuration 720, a front-pointing camera 722 is essentially perpendicular to a first side-pointing camera 724 and a second side-pointing camera 726. First and second side-pointing cameras 724-726 are pointing perpendicularly to one another, and are positioned essentially 90 degrees apart in the cylindrical surface of the tip section. In another configuration (not shown), a first and a second side-pointing cameras may be positioned more than 90 degrees apart in the cylindrical surface of the tip section, such as 120-150 degrees apart or 150-180 degrees apart. For example, the first and second side-pointing cameras may be positioned in 180 degrees apart, in opposite sides of the cylindrical surface of the tip section, so that they point in opposite directions. In yet further configurations (not shown), three or more side-pointing cameras may be positioned in the cylindrical surface of the tip section, for example, three cameras having 120 degrees in between them.
In configuration 740, a side-pointing camera 744 is pointing slightly backwards, so that it forms an angle larger than 90 degrees relative to a front-pointing camera 742. As an example, an angle of 120 degrees is shown. In another configuration (not shown), the angle is 100-145 degrees.
In configuration 760, two opposing side cameras 764 and 766 are shown, which are pointing slightly backwards, so that they each form an angle larger than 90 degrees relative to a front-pointing camera 762. As an example, an angle of 120 degrees is shown. In another configuration (not shown), the angle is 100-145 degrees.
Similarly, in other configurations (not shown), three or more side-pointing cameras may be positioned in the cylindrical surface of the tip section, each pointing slightly backwards and having an certain angle in between; in the case of three cameras, they may have an angle of 120 degrees in between them.
According to alternative embodiments, the endoscopes according to the invention, may include front/side pointing camera(s) at their tip section but may also include, in addition to or instead of one or more cameras, a fiber optic lens assembly. Such fiber optic lens assembly may include lens(es) and fiber optic(s) associated therewith, which are configured to receive light from the area of interest (tested/examined areas, such as a colon) and transfer the received light to a (video) camera which may be located in the handle of the endoscope or in the console. Reference is now made to FIG. 8, which shows, according to some embodiments, a perspective view of a multi-viewing elements endoscope, having a cut-away window to demonstrate an inner part of the endoscope, particularly the side pointing viewing element.
Endoscope 800 includes an elongated shaft 802 which typically includes a bending section (not shown) and a tip section 804 which terminates the endoscope. Endoscope 800 is illustrated with a cut-away window 801 which does not exist in real endoscopes but is presented in this figure merely to demonstrate an inner part of the endoscope, particularly the side pointing viewing element. Tip section 804 includes a front pointing viewing element 808 and three discrete illuminators (for example LEDs) 806a-c, which are associated with front-pointing viewing element 808 and are configured for illumination. Tip section 804 includes further includes one or more side pointing viewing element 814 (one is shown in this figure merely for illustrative purposes). Side pointing viewing element 814 includes lens assembly 815 and fiber optic 816. Lens assembly 815 is located at a side wall of tip section 804 and is configured to receive light from the area of interest (tested/examined areas, such as an inner part of a colon of a subject) and to transfer the received light through fiber optic 816 to a (video) camera which may be located in the handle of the endoscope or in the console.
It is noted that front-pointing viewing element 808 and side-pointing viewing element(s) 814 may be similar to each other or different. For example, front-pointing viewing element 808 may include a camera located in the tip section and side-pointing viewing element(s) 814 may include a lens assembly and a fiber optic transferring light to an image sensor located outside the tip section. According to another example, both front and side pointing viewing element may include a lens assembly and a fiber optic transferring light to an image sensor located outside the tip section. According to another example, the side-pointing viewing element(s) may include a camera located in the tip section and the front-pointing viewing element may include a lens assembly and a fiber optic transferring light to an image sensor located outside the tip section.
Tip section 804 includes further includes a working channel 810 which may be a hollow opening configured for insertion of a surgical tool to operate on various tissues. For example, miniature forceps may be inserted through working channel 810 in order to remove a polyp or sample of which for biopsy.
Tip 804 may further include other elements/components, (for example, as described herein according to various embodiments) such as additional viewing elements, fluid injector(s) for cleaning the cameras and/or there illuminators and pathway fluid injector(s) for inflating and/or cleaning the body cavity into which endoscope 800 is inserted.
While a number of exemplary aspects and embodiments have been discussed above, those of skill in the art will recognize certain modifications, permutations, additions and sub-combinations thereof. It is therefore intended that the following appended claims and claims hereafter introduced be interpreted to include all such modifications, permutations, additions and sub-combinations as are within their true spirit and scope.
In the description and claims of the application, each of the words “comprise” “include” and “have”, and forms thereof, are not necessarily limited to members in a list with which the words may be associated.

## Claims

1. A tip section of a multi viewing element endoscope, wherein the tip section has a flat end surface, a first curved side surface, and a second curved side surface opposing the first curved side surface and wherein the tip section comprises:
a front-pointing viewing element and a discrete front illuminator associated therewith;
a front fluid injector configured for cleaning at least one of said front-pointing viewing element and said discrete front illuminator, wherein the front-pointing viewing element is positioned on said flat end surface, has a length over which an external object remains in focus in a range of 3-100 millimeters, and has a first field of view of at least 150 degrees;
a first side-pointing viewing element;
a discrete side illuminator associated with the first side-pointing viewing element;
a side fluid injector configured for cleaning at least one of said side-pointing viewing element and said discrete side illuminator, wherein the first side-pointing viewing element is positioned on the first curved side surface, has a length over which an external object remains in focus in a range of 2-33 millimeters, has a second field of view of at least 150 degrees, and has a center positioned 7 to 11 millimeters from the flat end surface;
a second side-pointing viewing element;
a discrete side illuminator associated with the second side-pointing viewing element, wherein the second side-pointing viewing element is positioned on the second curved side surface, has a length over which an external object remains in focus in a range of 2-33 millimeters, has a third field of view of at least 150 degrees, and has a center positioned 7 to 11 millimeters from the flat end surface and wherein the first field of view partially overlaps with the second and third fields of view;
a working channel configured for insertion of a surgical tool; and
a pathway fluid injector for inflating and/or cleaning a body cavity into which the endoscope is inserted, wherein the pathway fluid injector, side fluid injector and front fluid injector are each in fluid communication with a common fluid supply channel.

2. The tip section according to claim 1, wherein said front-pointing viewing element, said first side-pointing viewing element, or second side-pointing viewing element comprise a fiber optic lens assembly.

3. The tip section according to claim 1, wherein said front-pointing viewing element comprises a camera and wherein at least one of said first or second side-pointing viewing elements comprises a fiber optic lens assembly.

4. The tip section according to claim 2, wherein said fiber optic lens assembly is configured to receive light from an area of interest and to transfer the received light to a camera located outside said tip section.

5. The tip section according to claim 4, wherein said camera is located in a handle of said endoscope or in a console associated with said endoscope.

6. The tip section according to claim 2, wherein said front-pointing viewing element and said first side-pointing viewing element are pointing at directions essentially perpendicular to one another.

7. The tip section according to claim 2, wherein said front-pointing viewing element and said first side-pointing viewing element are pointing approximately 100 to 145 degrees relative to one another.

8. The tip section according to claim 1, wherein each of said discrete front and side illuminators comprises one or more light-emitting diodes (LED).

9. A multi-viewing element endoscope comprising:
an elongated shaft terminating with a tip section turnable by way of a bending section, wherein said tip section has a flat end surface, a first curved side surface, and a second curved side surface opposing the first curved side surface and wherein the tip section comprises:
a front-pointing viewing element and a discrete front illuminator associated therewith, wherein the front-pointing viewing element is positioned on said flat end surface, has a length over which an external object remains in focus in a range of 3-100 millimeters, and has a first field of view of at least 150 degrees;
a front fluid injector configured for cleaning at least one of said front-pointing viewing element and said discrete front illuminator;
a first side-pointing viewing element;
a discrete side illuminator associated with the first side-pointing viewing element;
a side fluid injector configured for cleaning at least one of said first side-pointing viewing element and said discrete side illuminator, wherein the first side-pointing viewing element is positioned on the first curved side surface, has a length over which an external object remains in focus in a range of 2-33 millimeters, has a second field of view of at least 150 degrees, and has a center positioned 7 to 11 millimeters from the flat end surface;
a second side-pointing viewing element wherein the second side-pointing viewing element is positioned on the second curved side surface, has a length over which an external object remains in focus in a range of 2-33 millimeters, has a third field of view of at least 150 degrees, and has a center positioned 7 to 11 millimeters from the flat end surface and wherein the first field of view overlaps with the second field of view and the first field of view overlaps with the third field of view;
a working channel configured for insertion of a surgical tool; and
a pathway fluid injector for inflating and/or cleaning a body cavity into which the endoscope is inserted.

10. The multi-viewing element endoscope according to claim 9, wherein said front-pointing viewing element, said first side-pointing viewing element, or said second side-pointing viewing element comprise a fiber optic lens assembly.

11. The multi-viewing element endoscope according to claim 9, wherein said front-pointing viewing element comprises a camera and wherein at least one of said first or second side-pointing viewing elements comprises a fiber optic lens assembly.

12. The multi-viewing element endoscope according to claim 10, wherein said fiber optic lens assembly is configured to receive light from an area of interest and to transfer the received light to a camera located outside said tip section.

13. The multi-viewing element endoscope according to claim 12, wherein said camera is located in a handle of said endoscope or in a console associated with said endoscope.

14. The multi-viewing element endoscope according to claim 9, wherein said front-pointing viewing element and said second side-pointing viewing element are pointing at directions essentially perpendicular to one another.

15. The multi-viewing element endoscope according to claim 9, wherein said front-pointing viewing element and said second side-pointing viewing element are pointing approximately 100 to 145 degrees relative to one another.

16. The multi-viewing element endoscope according to claim 9, wherein each of said discrete front and side illuminators comprises one or more light-emitting diodes (LED).