Patent Publication Number: US-10779707-B2

Title: Multi-element cover for a multi-camera endoscope

Description:
CROSS-REFERENCE 
     This application is a continuation of U.S. Nonprovisional patent application Ser. No. 15/411,103, filed on Jan. 20, 2017, which claims the benefit of U.S. Provisional Patent Application No. 62/286,772, filed on Jan. 25, 2016, for priority, which is herein incorporated by reference in its entirety. 
     U.S. application Ser. No. 15/411,103 is also a continuation-in-part application of U.S. Nonprovisional patent application Ser. No. 15/144,569, filed on May 2, 2016, now U.S. Pat. No. 10,070,774, issued Sep. 11, 2018, which is a continuation of U.S. Nonprovisional patent application Ser. No. 14/791,314, filed on Jul. 3, 2015, now U.S. Pat. No. 9,351,629 issued on May 31, 2016, which is a continuation of U.S. Nonprovisional patent application Ser. No. 13/984,028, filed on Aug. 22, 2013, now U.S. Pat. No. 9,101,266, issued on Aug. 11, 2015, which is a national stage entry application of PCT Application No. PCT/IL2012/050037, filed on Feb. 6, 2012, which claims the benefit of priority of U.S. Provisional Patent Application No. 61/439,948, filed on Feb. 7, 2011-. All of the aforementioned applications are herein incorporated by reference in their entirety. 
    
    
     FIELD 
     Embodiments of the disclosure relate to a multiple element cover to a tip section of a multi-camera 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&#39;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. 
     Endoscopes, such as colonoscopes, that are currently being used, typically have a front camera for viewing the internal organ, such as the colon, an illuminator, a fluid injector for cleaning the camera lens and sometimes also the illuminator, and a working channel for insertion of surgical tools, for example, for removing polyps found in the colon. Often, endoscopes also have fluid injectors (“jet”) for cleaning a body cavity, such as the colon, into which they are inserted. The illuminators commonly used are fiber optics which transmit light, generated remotely, to the endoscope tip section. The use of light-emitting diodes (LEDs) for illumination is also known. 
     Among the disadvantages of such endoscopes are their limited field of view and their complicated packing of all the required elements, such as electronics and fiber optics together with fluid carrying elements, in the small sized endoscope tip section. Another problem with existing endoscopes is the difficult assembling of the gentle electronic components, which are often damaged by the assembling process itself. Another problem with existing endoscopes is the complicated sealing of the parts, specifically in the tip section of the endoscope. Sealing of the tip section remains a challenge particularly due to the complex environment in which the endoscope is intended to operate. 
     There is thus a need in the art for endoscopes, such as colonoscopes, that allow a broader field of view and also enable efficient packing, assembling and sealing of all necessary elements in the tip section while maintaining their function. 
     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. 
     In some embodiments, the present specification discloses a multi-component cover for the tip section of a multi-viewing element endoscope, said tip section comprising a front pointing viewing element and at least one side pointing viewing element, wherein each viewing element comprises an image sensor and a lens assembly, and each viewing element is associated with a discrete illuminator, said multi-component cover comprising: a main component configured to cover a portion of said tip section, wherein said main component has a total surface area; and a removable window component located on a side surface panel of said main component wherein said removable window component has a surface area that is equal to 30 to 85% of said total surface area of said main component, said removable window component configured to removably cover a window opening located on said main component, wherein said window opening is positioned to allow access to an inner part of said tip section without removing said main component. 
     Optionally, said window opening is located on said side surface panel such that it aligns with said removable window component. 
     Optionally, said window opening has edges that are adapted to couple to the removable window component. 
     Optionally, said window opening is aligned with at least one of: said side pointing viewing element; an optical assembly of said side pointing viewing element; a side discrete illuminator; and a side nozzle. 
     Optionally, said windows are aligned such that a distance from said windows to the underlying side pointing viewing element or side discrete illuminator is in a range of 0 to 3 millimeters. 
     Optionally, the multi-component cover further comprises a removable window component positioned on a front end of the main component of said tip cover, said front removable component being configured to cover a front window opening which allows access to a front inner part of said tip section. Optionally, said front removable window component comprises a window for at least one of: said front pointing viewing element; an optical assembly of said front pointing viewing element; a front discrete illuminator, a working/service channel; a front nozzle; and a front jet. Still optionally, said window of the front removable window component is aligned such that a distance from said window of the front removable window component to the front pointing viewing element or front discrete illuminator is in a range of 0 to 3 millimeters. 
     Optionally, the main component further includes a groove on a side surface, said groove being configured to allow the removable window component to slide along the groove and be repositioned on, or removed from, the multi-component cover. 
     Optionally, the removable window component comprises a flat surface to assist in directing a cleaning fluid injected from an injector channel towards a side optical assembly and optical windows. 
     Optionally, said tip section has a diameter of 17 mm or less. 
     Optionally, said main component is cylindrical in shape and has a diameter ranging between 2 mm and 17 mm. 
     Optionally, said removable window component comprises a flat depression having openings for accessing a side optical lens assembly, side illuminators and a side nozzle. 
     Optionally, said window opening is positioned on a circumference of said main component at a distance of 1 to 9 mm from a front surface of said main component. 
     Optionally, said window opening is positioned on a circumference of said main component at a distance of 7 mm to 7.9 mm from a front surface of said main component. 
     In some embodiments, the present specification discloses a tip section of a multi-camera endoscope, the tip section comprising: a front looking camera and a front discrete illuminator to essentially illuminate a field of view of said front looking camera; a first side looking camera and a first side discrete illuminator to essentially illuminate a field of view of said side looking camera, and a multi-component cover configured to cover and seal said tip section comprising a main component configured to cover a majority of said tip section; a first side removable component coupled to a side surface portion of said main component and having a surface area, said surface area being 30 to 85% of a surface area of said main component, wherein said first side removable component is configured to removably cover an opening located on said main component and wherein said opening is positioned to allow access to an inner part of said tip section without removing said main component. 
     Optionally, said tip section further comprises a second side looking camera and a second side discrete illuminator to essentially illuminate the field of view of said second side looking camera and said multi-component cover further comprises a second side removable component coupled to a side surface portion of said main component on an opposite side of said first side removable component and wherein said second side removable component is configured to cover a second opening located on said main component and wherein said second opening is configured to allow access to an inner part of said tip section without removing said main component, further wherein, when said first and second side removable window components are in place on said main component, a distance from a plurality of windows of said side removable window components to said first and second side looking cameras and said first and second side discrete illuminators respectively, is in a range of 0 to 3 millimeters. 
     Optionally, said multi-component cover further comprises a front removable component configured to cover an opening located on the front portion of said main component and wherein said opening on the front portion is configured to allow access to the inner part of the front panel of said tip section without removing said main component, further wherein when said front side removable window component is in place on said main component, a distance from a plurality of windows of the front removable window component to said front looking camera and front discrete illuminator is in a range of 0 to 3 millimeters. 
     Optionally, said main component comprises a channel alongside said side removable component and said side removable component is configure to be longitudinally pushed and slid through said channel to be repositioned in open position in which the inner parts of the tip section can be accessed through said opening. 
     Optionally, said main component comprises a groove alongside said side removable component and said side removable component is configured to be longitudinally pushed and slid through said groove to detach from said main component. 
     According to some embodiments, there is provided a tip section of a multi-camera endoscope, the tip section comprising: a front-pointing camera and a discrete front illuminator associated therewith; one or more side-pointing cameras and one or more discrete side illuminators associated therewith; and a multi-component cover configured to cover the inner parts of the tip section. 
     According to some embodiments, there is provided a tip section of a multi-camera endoscope, the tip section comprising: a front looking camera and a front discrete illuminator to essentially illuminate the Field Of View (FOV) of said front looking camera; a side looking camera and a discrete illuminator to essentially illuminate the FOV of said side looking camera, and a multi component cover configured to cover and seal said tip section such as to essentially prevent entry of fluids from the environment of said endoscope to inner parts of said tip section. 
     According to some embodiments, there is provided a tip section of a multi-camera endoscope, the tip section comprising: a front looking camera and a front discrete illuminator to essentially illuminate the Field Of View (FOV) of the front looking camera; a right side looking camera and a right discrete illuminator to essentially illuminate the FOV of the right side looking camera; a left side looking camera and a left discrete illuminator to essentially illuminate the FOV of the left side looking camera; and a multi-component cover configured to cover and seal the tip section such as to essentially prevent entry of fluids from the environment of the endoscope to inner parts of the tip section. 
     According to some embodiments, the multi-component cover comprises: a front-side component configured to cover a front part and a side part of the tip section; and a side component configured to cover another side part of the tip section, wherein the front-side component and the side component are configured to abut to cover the tip section. The front-side component may be configured to cover the front part and a right side part of the tip section and the side component is configured to cover a left side part of the tip section. Alternatively, the front-side component may be configured to cover the front part and a left side part of the tip section and the side component is configured to cover a right side part of the tip section. 
     According to some embodiments, the multi-component cover comprises: a front component configured to cover a front part; a right side component configured to cover a right side part of the tip section; and a left side component configured to cover a left side part of the tip section; wherein the front, right side and left side components are configured to abut to cover the tip section. 
     According to some embodiments, the multi-component cover comprises: a main component configured to cover the majority of the tip section; and a removable window component configured to cover a window opening located on the main component, wherein the removable window component is configured to allow access to an inner part of the tip section without removing the main component. 
     According to some embodiments, the multi-component cover comprises: a distal component configured to cover a distal part of the tip section; and a proximal component configured to cover a proximal part of the tip section, wherein the distal component and the proximal component are configured to abut to cover the tip section. According to some embodiments, the distal component may have a shape of a cylinder having a side wall and a front face, the front face is configured to cover a front part of the tip section and the proximal component has a shape of a cylinder having a side wall. According to some embodiments, the distal component may be configured for assembling over an inner part of the tip section from a distal part of the tip section and wherein the proximal component is configured for assembling over the inner part of the tip section from a proximal part of the tip section, such that the distal component and the proximal component are configured to join each other along a connection line, (which may be essentially perpendicular to the length of the tip section, for example, along an imaginary line extended between the two side cameras), such that the assembling does not cause damage to the a right/left side looking cameras or optical assemblies thereof. 
     The multi-component cover further comprises optical windows for one or more of: the front discrete illuminator, the right discrete illuminator, and the left discrete illuminator. 
     The multi-component cover may further comprise openings for one or more of: the front looking camera and/or an optical assembly thereof, the right side looking camera and/or an optical assembly thereof, and the left side looking camera and/or an optical assembly thereof. 
     The multi-component cover may further comprise a fluid channeling component adapted to channel fluid for insufflations and/or irrigation. The fluid channeling component may be a unitary component comprising a front fluid channel leading to a front opening at a distal end of the unitary fluid channeling component, for cleaning one or more front optical elements of the tip section, and a side fluid channel leading to a left side opening and to a right side opening in the unitary fluid channeling component, for cleaning side optical elements of the tip section. The unitary fluid channeling component further comprises a working channel adapted for the insertion of a medical tool. The unitary fluid channeling component further comprises a jet fluid channel adapted to clean a body cavity into which the endoscope is inserted. 
     According to some embodiments, the multi-component cover may further include openings for one or more of a front I/I injector and/or a nozzle thereof, a side I/I injector and/or a nozzle thereof, a jet fluid channel, and a working channel. 
     According to some embodiments, the front looking camera, the front discrete illuminator, the right side looking camera, the right discrete illuminator, the left side looking camera, and the left discrete illuminator are configured to be installed on a single electronic circuit board. 
     According to some embodiments, the tip section has a diameter of about 17 mm or less. 
     According to some embodiments, the tip section has a diameter of about 12 mm or less. According to some embodiments, the tip section has a diameter of about 10 mm or less. 
     According to some embodiments, the tip section has a diameter of about 7 mm or less, According to some embodiments, there is provided a method for assembling a multi-component cover on a tip section of a multi-camera endoscope, the method comprising installing one or more optical windows on a first part of a multi-component cover; installing the first part of an inner part of a tip section; installing one or more optical windows on a second part of the multi-component cover; and installing the second part of the inner part of the tip section. 
     According to some embodiments, the first part of the multi-component cover comprises: a front-side component configured to cover a front part and a side part of the tip section; and the second part of the multi-component cover comprises: a side component configured to cover another side part of the tip section, wherein the front-side component and the side component are configured to abut to cover the tip section. The front-side component may be configured to cover the front part and a right side part of the tip section and the side component is configured to cover a left side part of the tip section. The front-side component may be configured to cover the front part and a left side part of the tip section and the side component is configured to cover a right side part of the tip section. 
     According to some embodiments, the first part of the multi-component cover comprises a front component configured to cover a front part; the second part of the multi component cover comprises a right side component configured to cover a right side part of the tip section; a third part of the multi component cover comprises a left side component configured to cover a left side part of the tip section; and the front, right side and left side components are configured to abut to cover the tip section. 
     According to some embodiments, the first part of the multi-component cover comprises a main component configured to cover the majority of the tip section and the second part of the multi-component cover comprises a removable window component configured to cover a window opening located on the main component, wherein the removable window component is configured to allow access to an inner part of the tip section without removing the main component. 
     According to some embodiments, the first part of the multi-component cover comprises a distal component configured to cover a distal part of the tip section and the second part of the multi-component cover comprises a proximal component configured to cover a proximal part of the tip section, wherein the distal component and the proximal component are configured to abut to cover the tip section. The distal component may have a shape of a cylinder having a side wall and a front face, the front face is configured to cover a front part of the tip section and the proximal component has a shape of a cylinder having a side wall. 
     According to some embodiments, there is provided a multi-component cover for the tip section of a multi-viewing element endoscope, said tip section comprising a front pointing viewing element and at least one side pointing viewing element, wherein each viewing element comprises an image sensor and a lens assembly, and each viewing element is associated with a discrete illuminator, said multi component cover comprising: a main component configured to cover the majority of said tip section; and a removable window component located on a side surface panel of said main component, said removable component configured to cover a window opening located on said main component, wherein said window opening is configured to allow access to an inner part of said tip section without removing said main component. 
     The window opening may be located on said side surface panel such that it aligns with said removable window component. The window opening may have edges that are adapted to couple to the removable window component. 
     The removable window component may comprise windows or openings for one or more of said side pointing viewing element and/or an optical assembly thereof, a side discrete illuminator, and a side nozzle. 
     The multi-component cover may further comprise a removable window component positioned on a front end of said tip cover, said front removable component being configured to cover a front window opening which allows access to a front inner part of said tip section. The front removable window component may comprise openings for one or more of said front pointing viewing element and/or an optical assembly thereof, a front discrete illuminator; a working/service channel; a front nozzle; and a front jet. 
     The cover may comprise more than one removable window component located on its side surfaces and each of said removable components may be configured to cover a window opening which allows access to an inner part of said tip section. 
     The main component may further include a groove on its side surface, said groove being configured to allow the removable window component to slide along the groove and be repositioned on, or removed from, the tip cover. 
     The removable window component may comprise a flat surface to assist in directing a cleaning fluid injected from an injector channel towards the side optical assembly and optical windows. 
     The tip section may have a diameter of 17 mm or less. 
     According to some embodiments, any one of the parts (components) of the multi-component cover may include a channel/cavity, for example, along one or more edges of the part (component), on an external and/or internal part of the part (component). The channel/cavity may be configured to contain one or more adhesives, such as glue, for connecting the parts (components) to each other and thus allowing better sealing of the tip cover. 
     According to some embodiments, there is provided herein an endoscope comprising the tip section as described herein. According to some embodiments, there is provided herein a colonoscope comprising the tip section as described herein. 
     According to some embodiments, there is provided herein a multi-camera endoscope, such as a colonoscope, comprising the tip section disclosed herein. According to some embodiments, the tip section of an endoscope (such as a colonoscope) is the most distal part of the endoscope which terminates the endoscope. The tip section is turnable by way of a bending section connected thereto. 
     Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, suitable methods and materials are described below. In case of conflict, the patent specification, including definitions, will control. 
     In addition, the materials, methods, and examples are illustrative only and not intended to be limiting. 
     The aforementioned and other embodiments of the present shall be described in greater depth in the drawings and detailed description provided below. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and other features and advantages of the present invention will be appreciated, as they become better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein: 
         FIG. 1A  schematically depicts an isometric view of a tip section of an endoscope (including an electronic circuit board carrying cameras and illumination sources, and fluid channeling component), having a multi-component tip cover (shown in an exploded view), according to an exemplary embodiment of the present specification; 
         FIG. 1B  schematically depicts an isometric view of the tip section of  FIG. 1A , having an assembled multi-component tip cover, according to some exemplary embodiments of the present specification; 
         FIG. 2  schematically depicts an isometric view of a tip section of an endoscope (including an electronic circuit board carrying cameras and illumination sources, and a fluid channeling component), having a multi-component tip cover (shown in an exploded view), according to another exemplary embodiment of the present specification; 
         FIG. 3  schematically depicts an exploded view of a multi-component tip cover, according to an exemplary embodiment of the present specification; 
         FIG. 4A  schematically depicts an isometric view of a tip section of an endoscope (including an electronic circuit board carrying cameras and illumination sources, and a fluid channeling component), having a multi-component tip cover (shown in an exploded view), according to another exemplary embodiment of the present specification; 
         FIG. 4B  schematically depicts an isometric view of the tip section of  FIG. 4A , having a multi-component tip cover (partially in an exploded view), according to an exemplary embodiment of the present specification; 
         FIG. 4C  schematically depicts an isometric view of the tip section of  FIG. 4A  having an assembled multi-component tip cover, according to an exemplary embodiment of the present specification; 
         FIG. 5A  illustrates a side view of a multi-element tip cover in accordance with an embodiment of the present specification; 
         FIG. 5B  illustrates a front view of the multi-element tip cover of  FIG. 5A  in accordance with an embodiment of the present specification; 
         FIG. 5C  illustrates an isometric view of a multi-element tip cover positioned over the inner parts of a tip section of a multiple viewing elements endoscope, in accordance with an embodiment of the present specification; 
         FIG. 5D  is an isometric view of a main component portion of the multi-element tip cover of  FIG. 5C  in accordance with an embodiment of the present specification: 
         FIG. 5E  is an isometric view of a removable window component of the multi-element tip cover of  FIG. 5C , according to an embodiment of the present specification; 
         FIG. 6A  illustrates another embodiment of a multi-element tip cover of the present specification; 
         FIG. 6B  illustrates the tip cover of  FIG. 6A  with a side window component slid proximally to a second position in accordance with an embodiment of the present specification; 
         FIG. 6C  illustrates yet another embodiment of a multi-element tip cover of the present specification; 
         FIG. 7  illustrates a front face part of a multi-element tip cover in accordance with an embodiment of the present specification; and 
         FIG. 8  illustrates a cross sectional view of a multi-element tip cover, when placed over an endoscope tip, according to an embodiment of the present specification. 
     
    
    
     DETAILED DESCRIPTION 
     The present specification is directed towards multiple embodiments. The following disclosure is provided in order to enable a person having ordinary skill in the art to practice the invention. Language used in this specification should not be interpreted as a general disavowal of any one specific embodiment or used to limit the claims beyond the meaning of the terms used therein. The general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the invention. Also, the terminology and phraseology used is for the purpose of describing exemplary embodiments and should not be considered limiting. Thus, the present invention is to be accorded the widest scope encompassing numerous alternatives, modifications and equivalents consistent with the principles and features disclosed. For purpose of clarity, details relating to technical material that is known in the technical fields related to the invention have not been described in detail so as not to unnecessarily obscure the present invention. 
     It should be noted herein that any feature or component described in association with a specific embodiment may be used and implemented with any other embodiment unless clearly indicated otherwise. 
     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. 
     It is noted that the term “endoscope” as mentioned to herein may refer particularly to a colonoscope, according to some embodiments, but is not limited only to colonoscopes. The term “endoscope” may refer to any instrument used to examine the interior of a hollow organ or cavity of the body. 
     Reference is now made to  FIG. 1A , which schematically depicts an isometric view of a tip section of an endoscope (including an electronic circuit board carrying cameras and illumination sources, and a fluid channeling component), having a multi-component tip cover (shown in an exploded view), according to an exemplary embodiment of the current specification and to  FIG. 1B , which schematically depicts an isometric view of the tip section of  FIG. 1A , having an assembled multi-component tip cover, according to some exemplary embodiments of the current specification. 
     Tip section  100  generally includes an inner part  110  which includes electronics (such as cameras, a circuit board such as electronic circuit board  400 , and illumination sources, such as LEDs), fluid channels (such as fluid channeling component  600 ) and a multi-element tip cover  700 . Multi-element tip cover  700  is designed to fit over the inner parts of the tip section  100 , and to provide protection to the internal components in the inner part. Multi-element tip cover  700  includes, according to this embodiment, three parts: a front component  710  configured to cover a front part of the tip section; a right side component  730  configured to cover a right side part of the tip section; and a left side component  750  configured to cover a left side part of the tip section, wherein the front, right side and left side components are configured to abut each other to cover the tip section in such way that they cover essentially all inner parts of the tip section. 
     Front component  710  includes hole, transparent surface, window, or opening  736  configured to align with (and accommodate) front optical assembly  236  of forward looking camera  116 ; optical windows  242   a ,  242   b  and  242   c  of LEDs  240   a ,  240   b  and  240   c ; distal opening  340  of a working channel  640 ; distal opening  344  of a jet fluid channel  644 ; and irrigation and insufflation (I/I) injector  346  having a nozzle  348  (aligning with opening  664  of fluid channeling component  600 ). 
     Left side component  750  includes hole, transparent surface, window, or opening  756   b  configured to align with (and accommodate) side optical assembly  256   b  of side looking camera  220   b , optical windows  252   a  and  252   b  of LEDs  250   a  and  250   b  on both sides of optical assembly  256   b ; side I/I injector  266   b  adapted to align with side I/I opening  666   b  of fluid component  600 . Also seen in  FIG. 1A  and  FIG. 1B  are nozzles  267 A and  267 B for right side I/I injector (not shown) and left side I/I injector  266   b  respectively. 
     Right side component  730  includes similar elements (not shown) as left side component  750 . 
     Left side component  750  and right side component  730  are each in a shape of essentially half a cylinder (without top and bottom). 
     Front component  710  has essentially a cup shape having two opposing arms  712  and  714  extending perpendicularly from the cup bottom  711  (which may also be referred to as the cup&#39;s front face) and protruding from the cup edges. Upon assembling of the tip cover components, front component  710  may be installed first, and then the side components  730 ,  750  such that their long edges meet each other on both sides over arms  712  and  714  to assure sealing ( FIG. 1B ). Adhesives, such as glue, may be added, for example, in cavities  716  (along the external parts of the edges of component  710 ),  718  (along the internal edges of component  730 ) and  720  (along the internal edges of component  750 ) to allow complete sealing of tip section  100 . 
     Multi-element tip covers according to embodiments of the specification, such as multi-element tip cover  700  or any other multi-element tip cover as disclosed herein, solve a significant problem that exists in the art when attempts are made to pack all necessary components into the small inner volume of an endoscope tip and to cover and seal these components. Regular cup shaped tip covers are used for standard tips having just one front camera. However, when standard cup shaped tip covers are used to cover the multi-camera tip, protruding inner tip elements, such as lenses or other parts of the side optical assemblies, are often damaged during the sliding of the cover over them. Using a multi-element tip cover may solve this problem. In addition, a multi-element tip cover assists in aiming its holes/openings/windows exactly at their right place over the corresponding tip inner elements. This is almost impossible using a unitary piece cover. Moreover, separately sealing each one of the elements of the multi-element tip cover improves the overall sealing of the tip due to better access to each element (for example an optical window) compared to the limited access of the same element in a unitary piece cover, such as a cup shaped cover. Separately sealing (and optionally checking for satisfactory sealing) of each one of the elements of the multi-element tip cover may be performed prior to assembling of the cover. This may also improve the sealing of the tip. 
     According to an embodiment of the current specification, tip section  100  of an endoscope comprises at least a forwards looking camera and at least one side looking camera. Tip section  100  is turnable by way of a flexible shaft (not shown) which may also be referred to as a bending section (for example, a vertebra mechanism). 
     In some embodiments, the front-looking camera and/or any of the side-looking cameras comprises a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS) image sensor. 
     Tip section  100  includes front optical lens assembly  236  of forward looking camera  116 . An optical axis of forwards looking camera  116  is substantially directed along the long dimension of the endoscope. However, since forward looking camera  116  is typically a wide angle camera, its Field Of View (FOV) may include viewing directions at large angles to its optical axis. It should be noted that the number of illumination sources, such as LEDs, used for illumination of the FOV may vary (for example, 1-5 LEDs may be used on a front face of tip section  100 ). Distal opening  340  of a working channel  640  is also located on the front face of tip section  100 , such that a surgical tool inserted through working channel tube, and through the working channel  640  in the endoscope&#39;s tip section  100  and deployed beyond the front face may be viewed by forward looking camera  116 . 
     Distal opening  344  of a jet fluid channel  644  is also located on the front face of tip section  100 . In embodiments, distal opening  344  of a jet fluid channel  644  is be used for providing high pressure jet of fluid such as water or saline for cleaning the walls of the body cavity. 
     Also located on the front face of tip section  100  is an irrigation and insufflation (I/I) injector  346  having a nozzle  348  aimed at front lens optical assembly  236 . In embodiments, I/I injector  346  is used for injecting fluid (liquid and/or gas) to wash contaminants such as blood, feces and other debris from front lens optical assembly  236  of forward looking camera  116 . Optionally, the same injector is used for cleaning front lens optical assembly  236  and one, two or all of optical windows  242   a ,  242   b  and  242   c . In embodiments, I/I injector  346  is fed by fluid such as water and/or gas which may be used for cleaning and/or inflating a body cavity. 
     Visible on a left side of tip section  100  is the side camera (side looking camera) element  256   b  of side looking camera  220   b  and optical windows  252   a  and  252   b  of LEDs  250   a  and  250   b  for camera  220   b . A second side looking camera (not shown) is positioned on the right side of the tip and can be similar to camera  220   b . Optical axis of the second side looking camera is substantially directed perpendicular to the long dimension of the endoscope Optical axis of side looking camera  220   b  is substantially directed perpendicular to the long dimension of the endoscope. However, since side looking camera  220   b  and the second side looking camera are typically wide angle cameras, their fields of view may include viewing directions at large angles to their optical axes. 
     Side I/I injector  266   b  having a nozzle  267   b  aimed at side optical lens assembly  256   b  may be used for injecting fluid to wash contaminants such as blood, feces and other debris from side optical lens assembly  256   b  of side looking camera. In embodiments, the fluid includes gas which may be used for inflating a body cavity. Optionally, the same injector is used for cleaning both side optical lens assembly  256   b  and optical windows  252   a  and/or  252   b . It is noted that according to some embodiments, the tip includes more than one window and LEDs, on the side and more than one window and LEDs in the front (for example, 1-5 windows and two LEDs on the side). Similar configuration of I/I injector and nozzle (not shown) exists for cleaning the optical lens assembly and optical windows (not shown) located on the other side of tip  100 . The I/I injectors are configured to clean all or a part of these windows/LEDs. In various embodiments, left side I/I injector  266   b , right side I/I injector (not shown), and front side I/I injector  344  are fed from the same channel in the fluid channeling component  600 . In other embodiments, front side I/I injector is  344  is fed from a first fluid channel and left side I/I injector  266   b  and right side I/I injector are fed from a second, separate fluid channel in the fluid channeling component  600 . 
     It is noted that the right side wall (not shown) and left side wall  362  have a form of an essentially flat surface which assists in directing the cleaning fluid injected from the right side I/I injector (not shown) and the left side injector  266   b  towards the right side optical assembly and windows and the left side optical assembly  256   b  and optical windows  252   a  and/or  252   b  respectively. Lack of such a flat surface may result in dripping of the cleaning fluid along the curved surface of tip section  100  of the endoscope without performing the desired cleaning action. 
     It should be noted that while only one side looking camera can be seen in  FIG. 1A  and  FIG. 1B , preferably at least two side looking cameras are located within tip section  100 . When two side looking cameras are used, the side looking cameras are preferably installed such that their field of views are substantially opposing. However, different configurations and number of side looking cameras are possible within the general scope of the current specification. 
     According to some embodiments, the circuit board used for carrying electronic components, such as cameras and/or LEDs, is a flexible circuit board that consumes less space and leaves more volume for additional necessary features. The flexibility of the board adds another dimension in space that can be used for components positioning. 
     The use of a flexible circuit board, according to embodiments of the specification, significantly increases reliability of the electric modules connection thereto as no wires are required for components connectivity. In addition, according to some embodiments, the components assembly can be machined and automatic. 
     The use of a flexible circuit board, according to some embodiments of the specification, also allows components (parts) movement and maneuverability during assembly of the camera head (tip of the endoscope) while maintaining a high level of reliability. The use of the circuit board, according to some embodiments of the specification, also simplifies the (tip) assembling process. 
     According to some embodiments, a flexible circuit board is connected to the control unit via a multi-wire cable. This cable is welded on the board in a designated location, freeing additional space within the tip assembly and adding flexibility to cable access. Assembling the multi-wire cable directly to the electrical components presents a major challenge which is mitigated by the use of the flexible board according to embodiments of the specification. 
     Reference is now made to  FIG. 2 , which schematically depicts an isometric view of a tip section of an endoscope (including an electronic circuit board carrying cameras and illumination sources, and a fluid channeling component), having a multi-component tip cover (shown in an exploded view), according to an exemplary embodiment of the current specification. Tip section  200  generally includes an inner part  210  which may be similar to inner part  110  of tip section  100  of  FIGS. 1A-1B  and a multi-element tip cover  800 . Multi-element tip cover  800  is designed to fit over the inner part  210  of the tip section  200 , and to provide protection to the internal components in the inner part  210 . Multi-element tip cover  800  includes, according to this embodiment, a main component  830  configured to cover the majority of the tip section, and a removable window component  850  configured to cover a window opening  860  located on main component  830 , such that removable window component  850  is configured to allow access to an inner part  210  of tip section  200  without removing main component  830 . This allows fixing or replacing one of the components of inner part  210  (such as a LED, an optical element or any other element) without removing main component  830  and damaging the packing and sealing of tip section  200 . 
     Main component  830  has essentially a cup shape having a front face part configured to cover the front face of tip section  200  and cup edges configured to cover the side surface of tip section  200 . 
     Main component  830  may further includes front and side holes, openings, windows and surfaces similar to those of multi-component cover  700  of  FIG. 1A  and  FIG. 1B . 
     Reference is now made to  FIG. 3 , which schematically depicts an exploded view of a multi-component tip cover, according to an exemplary embodiment of the current specification Multi-element tip cover  900  is designed to fit over the inner part (not shown) of a tip section and to provide protection to the internal components in the inner part. Multi-element tip cover  900  includes, according to this embodiment, a front-side component  930 , comprising a front portion  931  and a side portion  932 , configured to cover a front part and a side part of the tip section, and a side component  950  configured to cover another side part of the tip section, wherein front-side component  930  and side component  950  are configured to abut to cover the tip section. 
     Reference is now made to  FIGS. 4A through 4C .  FIG. 4A  schematically depicts an isometric view of a tip section of an endoscope (including an electronic circuit board carrying cameras and illumination sources, an electronic circuit board holder, and a fluid channeling component), having a multi-component tip cover (shown in an exploded view), according to an exemplary embodiment of the current specification.  FIG. 4B  schematically depicts an isometric view of the tip section of  FIG. 4A , having a multi-component tip cover (partially in an exploded view), according to an exemplary embodiment of the current specification.  FIG. 4C  schematically depicts an isometric view of the tip section of  FIG. 4A  having an assembled multi-component tip cover, according to an exemplary embodiment of the current specification. 
     Tip section  1000  generally includes an inner part  1100  which includes electronics (such as cameras, a circuit board, and LEDs), fluid channels (such as fluid channeling component  1600 ) and a multi-element tip cover  1010 . Multi-element tip cover  1010  is designed to fit over the inner parts of the tip section  1000  and to provide protection to the internal components in the inner part  1100 . In various embodiments, the tip section  1000  comprises three parts/portions: a distal/front part  1102 , a proximal part  1104  and a rear part  1105 , Multi-element tip cover  1010  includes, according to this embodiment, two parts: a distal component  1050  configured to cover a distal/front part  1102  of the tip section and a proximal component  1030  configured to cover a proximal part  1104  of the tip section, wherein the distal component and the proximal component are configured to abut to cover the tip section  1000 . Distal component  1050  has a shape of a cylinder having a side wall  1052  and a front face  1054 , wherein front face  1054  is configured to cover a front part  1102  of inner part  1100  of tip section  1000  and proximal component  1030  has a shape of a cylinder having a side wall  1032  without a top or a bottom configured to cover a proximal part  1104  of inner part  1100  of tip section  1000 . In accordance with an embodiment, the proximal component  1030  of the tip cover  1010  does not cover a rear part  1105  of the tip section  1000 , but only the proximal part  1104 . This enables connection between a bending section of the endoscope and the tip section  1000  to be on the rear part  1105  thereby effectively reducing the non-flexible portion of the bending section Distal component  1050  includes on front face  1054  thereof hole, transparent surface, window or opening  1056  configured to align with front optical assembly  1236  of forwards looking camera  1116 ; optical windows  1242   a ,  1242   b  and  1242   c  of LEDs  1240   a ,  1240   b  and  1240   c ; distal opening  1340  of a working channel  1640 ; distal opening  1344  of a jet fluid channel  1644 ; and I/I injector  1346  (aligning with opening  1664  of fluid channeling component  1600 ). 
     Distal component  1050  further includes on side wall  1052  thereof optical windows  1252   a  of LED  1250   a  and on an opposing side of side wall  1052  another optical window of another LED (not shown). 
     Distal component  1050  further includes on the edge of side wall  1052  thereof a recess  1756 ′ (essentially in a shape of half a hole) configured to accommodate (along with a recess  1756 ″ on the edge of side wall  1032  of proximal component  1030 ) optical assembly  1256   b  of side looking camera  1120   b . On an opposing side of side wall  1052  there may be a similar recess (not shown) to accommodate (along with another recess on the edge of an opposing side of side wall  1032  of proximal component  1030 ) an optical assembly (not shown) of a side looking camera (not shown) located on the other side of inner part  1100 . Proximal component  1030  includes on side wall  1032  thereof optical windows  1252   b  of LED  1250   b  and on an opposing side of side wall  1032  another optical window  1252   a  of another LED (not shown). 
     Proximal component  1030  further includes on the edge of side wall  1032  thereof a recess  1756 ″ (essentially in a shape of half a hole) configured to accommodate (along with recess  1756 ′ on the edge of side wall  1052  of distal component  1050 ) optical lens assembly  1256   b  of side looking camera  1120   b . On an opposing side of side wall  1032  there is a similar recess  1756   a ″ to accommodate (along with another recess on the edge of an opposing side of side wall  1152  of proximal component  1050 ) an optical assembly (not shown) of a side looking camera (not shown) located on the other side of inner part  1100 . 
     Proximal component  1030  further includes side I/I injector  1266   b  adapted to align with side I/I opening  1666   b.    
     Other parts of inner part  1100  of tip section  1000  may generally be similar to inner part  1100  of tip section  100  of  FIGS. 1A, 1B . The method of assembling tip section  1000  over inner part  1100  may include assembling distal component  1050  from the distal/front part  1102  of tip section  1000 , assembling proximal component  1030  from the proximal part  1104  of tip section  1000  and joining distal component  1050  and proximal component  1030  along their edges (line  1500 ) such that none of the tip cover components slides over the optical assemblies of the side looking cameras. 
     In yet another embodiment, the present specification discloses a multi-element tip cover that not only provides protection to the internal components of the endoscope tip, but also facilitates easy access to the internal components in the tip section, such that a component may be removed or replaced if required without having to remove the tip cover. 
     The present embodiments disclose a novel assembly approach of the tip cover on the distal tip and also provide a novel solution to the problem of replacing broken outer windows of the camera and illuminators. Additionally, efficient solutions are provided for replacing internal components of the distal tip, such as sensors, cables, illuminators, internal lenses, and other such components. 
     As shown earlier with reference to  FIG. 4A , tip section  1000  generally includes an inner part  1100  which includes an electronic circuit board that carries cameras and illumination sources, and a fluid channeling component  1600 . 
     In an embodiment, a multi-element tip cover is designed to fit over the inner part  1100  of the tip section  1000  and to provide protection to the internal components in the inner part  1100 . 
       FIG. 5A  and  FIG. 5B  illustrate side and front views respectively of a multi-element tip cover  5000  in accordance with an embodiment of the present specification. In an embodiment, the multi-element tip cover includes a main component portion  5030 . The main component  5030  of the tip cover is substantially cylindrical in an embodiment, and is configured to cover a major portion of the tip section of an endoscope. As known in the art, the diameter of the distal tip of an endoscope varies from scope to scope. Therefore, in an embodiment, the size of the tip cover is customized such that it fits the dimensions of the corresponding distal tip. In various embodiments, the diameter of the main component  5030  of the tip cover  5000  varies from 2 to 17 millimeters. In an embodiment, the tip cover  5000  is made up of suitable materials known in the art such as PEEK (polyether ether ketone), or other polymer based materials. In an embodiment, the main component  5030  of the tip cover  5000  further comprises a removable window component (a side removable panel)  5050 , located on a side surface wall  5055 . The window component  5050  is configured to cover a window opening (not shown) located on main component  5030 . In an embodiment, the window opening is designed to provide access to the inner part of the tip section which includes components such as viewing elements and associated optics and lenses, illuminators, sensors, and other components located inside. 
     Thus, the removable window component  5050  is designed such that it can be removed to gain access to the window opening, through which the internal components of the tip can be accessed for repair or replacement, without removing the main component  5030 . Therefore, for fixing or replacing one or more components of the inner part of the tip section, such as an LED, an optical element or any other element, the entire tip is not opened or exposed. Further, the main component  5030  of the tip cover remains intact and protects the packing and sealing of the tip section from damage. In various embodiments, the removable window component  5050  comprises a surface area in a range of 30 to 85% of the total surface area of the cylindrical side wall  5055  of the tip cover  5000 . In various embodiments, an aspect ratio of width to length of the removable window component  5050  is in a range of 1:6. In various embodiments, when the removable window component  5050  is in place on said main component  5030 , the windows of the removable window component  5050  and the underlying optical elements and/or LEDs are aligned such that a distance from the windows of the removable window component  5050  to the underlying optical elements and/or LEDs is in a range of 0 to 3 millimeters, and any increment therein, preferably 0 to 1 millimeters. 
     In an embodiment, the multi-element tip cover comprises three window openings with removable window components—one on the front for accessing front viewing element and other components located in the front section of the distal tip and one each on the two sides for accessing the corresponding side viewing elements and other components located on the two sides of the distal tip. The front removable window component comprises a surface area in a range of 20 to 85% of the total surface area of the front distal surface of the tip cover and the side window components each comprise a surface area in a range of 30 to 85% of the total surface area of the cylindrical side wall of the tip cover. In various embodiments, the front removable window component has any one of a circular, oval (as described with reference to  FIG. 7  below), square, rectangular, or irregular shape. An aspect ratio of width to length of the front window component is in a range of 1:6 and an aspect ratio of width to length of each side removable window component is in a range of 1 to 6. When the front removable window component and side removable window components are in place, the windows or openings of the front removable window component and the underlying optical elements and/or LEDs are aligned such that a distance from the windows or openings of the front removable window component to the underlying optical elements and/or LEDs is in a range of 0 to 3 millimeters, and any increment therein, and the windows or openings of the side removable window components and the underlying optical elements and/or LEDs are aligned such that a distance from the windows or openings of each side removable window component to the underlying optical elements and/or LEDs is in a range of 0 to 3 millimeters, and any increment therein. 
     In another embodiment (shown in  FIGS. 6A, 6B and 8 ), the multi-element tip cover comprises only side window openings with side removable window components. The side removable window components each comprise a surface area in a range of 30 to 85% of the total surface area of the cylindrical side wall of the tip cover. An aspect ratio of width to length of each side removable window component is in a range of 1.6. When the side removable window components are in place, the windows or openings of the side removable window components and the underlying optical elements and/or LEDs are aligned such that distance from the windows or openings of each side removable window component to the underlying optical elements and/or LEDs is in a range of 0 to 3 millimeters, and any increment therein. 
     In yet another embodiment, the multi-element tip cover comprises a front window opening with removable front window component and only one side window opening with removable side window component. The front window opening component comprises a surface area in a range of 20 to 85% of the total surface area of the front distal surface of the tip cover and the side window component comprises a surface area in a range of 30 to 85% of the total surface area of the cylindrical side wall of the tip cover. An aspect ratio of width to length of the front window component is in a range of 1.6 and an aspect ratio of width to length of the side removable window component is in a range of 1:6. When the front removable window component and side removable window component are in place, the windows or openings of the front removable window component and the underlying optical elements and/or LEDs are aligned such that a distance from the windows or openings of the front removable window component to the underlying optical elements and/or LEDs is in a range of 0 to 3 millimeters, and any increment therein, and the windows or openings of the side removable window component and the underlying optical elements and/or LEDs are aligned such that a distance from the windows or openings of the side removable window component to the underlying optical elements and/or LEDs is in a range of 0 to 3 millimeters, and any increment therein. 
     Referring to  FIG. 5B , a front view of the multi-element tip cover  5000  is shown, in accordance with an embodiment of the present specification. The figure shows a front face part (front panel)  5080  of the main component  5030  of the tip cover  5000 , and is configured to cover the front face of the tip section. In an embodiment, front face part  5080  further includes openings and windows to correspond to front panel of the tip section, as shown earlier with respect to  FIG. 4A . Thus, the front face part  5080  includes windows  5240   a ,  5240   b , and  5240   c  for the illuminators of the front viewing element and window  5236  for the front viewing element camera (image sensor) located in the front portion of the tip section. In various embodiments, central window  5236  is aligned with the front viewing element such that the underlying front viewing element is within a range of 0 to 3 millimeters, and any increment therein, from central window  5236 . Window  5240   a  is located at a position corresponding to 9 o&#39;clock relative to central window  5236  and is within a range of 0 to 3 millimeters, and any increment therein, from an underlying illuminator. Window  5240   b  is located at a position corresponding to 3 o&#39;clock relative to central window  5236  and is within a range of 0 to 3 millimeters, and any increment therein, from an underlying illuminator. Window  5240   c  is located at a position corresponding to 6 o&#39;clock relative to central window  5236  and is within a range of 0 to 3 millimeters, and any increment therein, from an underlying illuminator. 
     In other embodiments, the front face  5080  of the tip cover  5000  further includes a distal opening of a working channel, distal opening of a jet fluid channel, and I/I injector aligning with an opening of a fluid channeling component. For the purpose of clarity and simplicity, these openings are not shown in  FIG. 5B . 
       FIG. 5C  shows an isometric view of another embodiment of a multi-element tip cover  5000   c . Referring to  FIG. 5C , the multi-element tip cover  5000   c  has a main component portion  5030   c  and a side removable window component  5050   c  located in a side panel recess or opening  5055   c  of the main component portion  5030   c . The side removable window component  5050   c  is sized and configured to fit within side panel opening or recess  5055   c . Main component portion  5030   c  is configured to cover a major portion of a tip section  5001  of an endoscope. The side removable window component  5050   c , in an embodiment, is in the form of a removable panel. In an embodiment, the side removable window component  5050   c  comprises a flat depression  5028   c  which comprises a window or opening  5004   c  for a side optical lens assembly, optical windows  5006   c ,  5008   c  for illuminators, and a side nozzle opening  5010   c  for a side nozzle A front panel  5080   c  is positioned on a front end of the tip cover  5000   c . The front panel  5080   c  comprises a window or opening  5236   c  for a front optical lens assembly, optical windows  5250   a ,  5250   b  and  5250   c  for front illuminators, a working/service channel opening  5022   c , a nozzle opening  5024   c  and a jet opening  5026   c.    
     It may be noted that the overall shape of the distal tip is substantially round, yet the side components including the side camera, LEDs, and jet are placed in flat depression  5028   c . This flat depression  5028   c  is located on a surface of the side removable window component  5050   c.    
     In an embodiment, multi-element tip cover  5000   c  has one side removable window component  5050   c  on one side. In another embodiment, multi-element tip cover  5000   c  has more than one side removable window component on its tip side surfaces to enable easy access to the internal components in the tip section, such that a component may be removed or replaced if required without having to remove the entire tip cover  5000   c.    
       FIG. 5D  shows another isometric view of the multi-element tip cover  5000   c  of  FIG. 5C . In this figure, the side removable window component (shown as side removable window component  5050   c  in  FIG. 5C ) is removed, exposing side panel opening or recess  5055   c . In an embodiment, the side panel opening or recess  5055   c  is positioned on the circumference of the endoscope tip at a distance (depth) ranging from approximately 1 to 9 millimeters from the surface of the tip, and in an embodiment is positioned at approximately 7.0 or 7.9 millimeters, from the surface of the tip. 
     In an embodiment, the main component portion  5030   c  comprises edges  5070   d  about the side panel opening or recess  5055   c  that are adapted to couple to the side removable window component, in a manner such that the side removable window component may easily be put on to cover the side panel opening or recess  5055   c  and may also be easily removed. In an embodiment, the side removable window component may be coupled to the edges  5070   d  of the main component portion  5030   c  by any suitable coupling means known in the art, such as but not limited to screws, hinges, hooks, adhesives or welding. Optionally, in some embodiments, wherein an endoscope includes side viewing elements on both sides of a tip section, the tip cover  5000   c  includes another side panel opening or recess  5065   c  positioned on the opposite side of side panel opening or recess  5055   c  and another side removable window component similar to the side window component  5050   c  for side panel opening or recess  5065   c.    
       FIG. 5E  shows the side removable window component  5050   c  for the multi-element tip cover  5000   c  of  FIG. 5C . In an embodiment, side removable window component  5050   c  is substantially curved along its long axis, and is configured to cover a side portion of a tip section of an endoscope. In an embodiment, a flat depression  5028   c  is located in a surface  5051   c  of the side removable window component  5050   c . A window or opening  5004   c  for a side optical lens assembly, optical windows  5006   c ,  5008   c  for illuminators, and side nozzle opening  5010   c  are placed in the flat depression  5028   c . In various embodiments, the side removable window component  5050   c  comprises a surface area in a range of 30 to 85% of the total surface area of the cylindrical side wall  5029   c  of the tip cover  5000  and, in turn, the flat depression  5028   c  comprises a surface area in a range of 0.50 to 90% of the total surface area of the side removable component  5050   c . In various embodiments, an aspect ratio of width to length of the side removable window component  5050   c  is in a range of 1:6 and an aspect ratio of width to length of the flat depression  5028   c  is in a range of 1:10. In various embodiments, when the side removable window component  5050   c  is in place on said main component  5030   c , a distance from the windows  5004   c ,  5006   c ,  5008   c  of the removable window component  5050  to the underlying optical elements and/or LEDs is in a range of 0 to 3 millimeters, and any increment therein. 
       FIG. 6A  shows another embodiment of a multi-element tip cover  6000  of the present specification. Referring to  FIG. 6A , tip cover  6000  includes a main component  6030 , The main component  6030  of the tip cover  6000  is substantially cylindrical in an embodiment, and is configured to cover a major portion of the tip section  6001  of an endoscope. The main component  6030  of the tip cover further comprises a side window component  6050 , located on a side surface  6055 , also called the side wall. As mentioned earlier, the overall shape of the main component  6030  is substantially cylindrical, yet side components, including windows or openings, such as windows or openings  6004 ,  6006 ,  6008 , for components such as the side camera, LEDs, and jet of the endoscope tip, are positioned in a flat depression  6028 . This flat depression  6028  is located in the side window component  6050 . The side window component  6050  is configured to cover a window opening (not shown) located on main component  6030 , which is designed to provide access to the components (camera. LEDs, jet) in the inner part of the tip section. 
     In an embodiment, the main component  6030  further includes a groove  6032  on its side surface  6055  and complementary extensions off the sides of the removable window component that mate thereto. The groove  6032  is designed such that removable window component  6050  may be slid along groove  6032 , longitudinally along a length of the endoscope tip, to expose the window opening and the components of the inner part of the endoscope tip when required. Thus, when one of the internal components of the tip section is to be repaired or replaced, the side window component  6050  is slid longitudinally along the groove  6032  to reveal the window opening, which provides access to the desired internal component. It should be appreciated that the groove could alternatively be on the removable window component  6050  and the mating members could be extending out from the main component  6030  into the window opening. 
     It may be noted that in an embodiment, a part of side window component  6050  has the form of an essentially flat surface which assists in directing the cleaning fluid injected from injector channel towards side optical assembly and optical windows. Lack of such a flat surface may result in dripping of the cleaning fluid along the curved surface of tip section of the endoscope without performing the desired cleaning action. 
     In an embodiment, windows or openings  6004 ,  6006 ,  6008  for the camera and illuminators of the endoscope tip (not shown in  FIG. 6A ) are located in notch or depression  6028 . In this way, the outer windows (which are the outer lens of the side camera and side illuminators) located in the side wall and the side window component  6050  covering it are elevated from the depression in sidewall  6055 , but still do not protrude from the level of cylindrical surface of the tip cover  6000 . The notch/depression protects the sidewall and components thereof, such as side optical assembly, side illuminators, and side nozzle from both longitudinal and latitudinal mechanical shocks by keeping them below the level of the cylindrical surface of the tip cover  6000 . In an embodiment, the outer windows and side nozzle are below the cylindrical surface of the tip cover, while the side window component  6050  is at the same level as the cylindrical surface of the tip cover. In an embodiment, the outer windows and side nozzle opening are positioned on the circumference of the endoscope tip at a distance (depth) ranging from approximately 1 to 9 millimeters from the surface of the tip, and in an embodiment are positioned at approximately 7.0 or 7.9 millimeters, from the surface of the tip. 
     In an embodiment, groove  6032  extends, alongside the surface  6055 , from a proximal end of the side window component  6050  to the proximal end  6040  of the tip cover  6000 , where the tip is connected to the endoscope tube. The side window component  6050  may be slid along said groove  6032 , in a proximal direction, to move it away and reveal the window opening when required. Referring to  FIG. 6A , the side window component  6050  is in a first position, slid most distally, and covers a window opening providing access to the components of the inner part of the endoscope tip. In an embodiment, the side window component  6050  includes a catching mechanism to prevent it from being completely removed from said tip cover  6000 . In another embodiment, the side window component  6050  may be slid completely off of said main component  6030  and removed from said tip cover  6000 . In other embodiments (not shown), a groove is positioned distal to the side window component, or above or below said side window component, when viewed from the side, to allow for sliding of the side window component in a distal, up, or down direction respectively to expose the components of the inner part of the endoscope tip. 
       FIG. 6B  shows the tip cover  6000  of  FIG. 6A  with the side window component  6050  slid proximally to a second position. In  FIG. 6B , the side window component  6050  is in its most proximal position, exposing window opening  6015  and providing access to components, such as a side camera  6014  and side illuminators  6016 ,  6018 , of the inner part of the endoscope tip  6001 . 
       FIG. 6C  shows yet another embodiment of a multi-element tip cover  6100  of the present specification. Referring to  FIG. 6 (C, the main component  6130  of the tip cover further includes a groove  6134  on its side surface  6155 . In this embodiment, the groove  6134  is substantially “L” shaped and extends from the location  6142  of a side window component  6150  on the side surface  6155  to the proximal end  6140  of the tip cover  6100 , where the tip is connected to the endoscope tube. The groove  6134  is designed such that removable window component  6150  may be slid along groove  6134  to expose a window opening (not shown) when required. Thus, when one of the internal components of the tip section is to be repaired or replaced, the side window component is moved along the groove  6134  to reveal the window opening, which provides access to the desired internal component. 
     In this embodiment, the removable window component  6150  located in the side wall  6155  is aligned with the outer surface of main component  6130  which is typically a substantially cylindrical surface. Side camera outer window  6104 , illuminators outer windows  6106 ,  6108  and nozzle (not shown) are located in a depression  6128  in the removable window component  6150 , such that they do not protrude from the level of cylindrical surface of the tip cover  6100 . 
       FIG. 7  shows another embodiment of a front face part  7080  of a multi-element tip cover  7000  of the present specification. Referring to  FIG. 7 , front face part  7080  includes windows  7240   a ,  7240   b , and  7240   c  for the illuminators of the viewing element and window  7236  for the viewing element camera. The front face part  7080  of the tip cover  7000  further includes a front removable window component  7082  which is configured to allow access to the inner part of tip section located on a front panel (shown as  1102  in  FIG. 4A ). In embodiments, the window component  7082  can be removed, if required, without removing the remainder of the tip cover  7000 . This allows repairing or replacing one of the several components of front panel  1102  shown in  FIG. 4A , such as LEDs  1240   a ,  1240   b ,  1240   c , optical element  1236 , or any other element, without removing the remainder of the cover  7000  and preventing any potential damage to the packing and sealing of the tip section. In an embodiment, the front panel comprises a window opening that has edges for coupling to the front removable window component  7082 , in the same manner as a side panel window opening couples to the side removable window component (shown as  5050   c  and explained with reference to  FIGS. 5C-5E ). In various embodiments, the front removable window component  7082  comprises a surface area in a range of 20 to 85% of the total surface area of the front face part  7080  of the tip cover  7000 . In various embodiments, an aspect ratio of width to length of the front removable window component  7082  is in a range of 1:6. In various embodiments, when the removable window component  7082  is in place on said front face part  7080 , the windows  7236 ,  7240   a ,  7240   b , and  7240   c  of the front removable window component  7082  and the underlying optical elements and/or LEDs are aligned such that a distance from the windows  7236 ,  7240   a ,  7240   b , and  7240   c  of the removable window component  7082  to the underlying optical elements and/or LEDs is in a range of 0 to 3 millimeters, and any increment therein. 
     In various embodiments, side window components  6050  and  6150  of  FIG. 6A  and  FIG. 6C  respectively are coupled to the multi-element tip cover by any of the various methods known in the art such as by using epoxy glue, ultrasonic welding or laser welding. In various embodiments, front window removable component  7082  of  FIG. 7  is coupled to a front panel window opening of the multi-element tip cover by any suitable sealing or coupling means know in the art, such as but not limited to screws, hinges, hooks, adhesives, or welding. 
       FIG. 8  illustrates a partial side cross sectional view of multi-element tip cover  8000 , when placed over an endoscope tip in accordance with an embodiment of the present specification. It may be noted that this figure represents part of the side panel of the tip, and does not show the front panel and the proximal part of the tip. Referring to  FIG. 8 , the inner part  8100  of an endoscope tip comprises a viewing element  8256  and its associated illuminators  8250   a  and  8250   b . The endoscope tip is surrounded by the tip cover  8000 , with the main component  8030  of the tip cover covering a major portion of the tip. A window opening  8060  is provided in the main component  8030 , which provides access to the viewing element  8256 , illuminators  8250   a ,  8250   b  and other components (not shown) in the inner part  8100  of the tip. As explained earlier with reference to  FIGS. 5C-5E , a side removable window component  8050  is provided such that it covers the window opening  8060  in the main component  8030 . In an embodiment, the side removable window component  8050  further comprises windows or openings such as the windows  8156 ,  8150   a ,  8150   b  corresponding to the viewing element  8256 , illuminators  8150   a ,  8150   b , and other components in the inner part. Thus, removable window component  8050  comprises a window  8156  corresponding to the viewing element  8256 , and windows  8150   a  and  8150   b  corresponding to the illuminators  8250   a  and  8250   b , respectively. 
     In an embodiment, side removable window component  8050  is produced by insertion molding of illuminators windows  8150   a  and  8150   b  and the outer window  8156  of viewing element  8256 . In an embodiment, instead of a window  8156 , the lens of the viewing element is molded into the side removal window component  8050 . It may be appreciated that the location of the optical windows ( 8156 ,  8150   a  and  8150   b ) in the side removable window component  8050  is designed to align with the location of the viewing element and the illuminators ( 8256 ,  8250   a  and  8250   b , respectively) of the inner part  8100  of the tip section. 
     The above examples are merely illustrative of the many applications of the system of present specification. Although only a few embodiments of the present invention have been described herein, it should be understood that the present invention might be embodied in many other specific forms without departing from the spirit or scope of the invention. Therefore, the present examples and embodiments are to be considered as illustrative and not restrictive, and the invention may be modified within the scope of the appended claims.