Next generation colonoscope

[0001] The present invention relates to colonoscopes, more specifically to a colonoscope that enables various segments of the colon to be visualized multiple times during a single passage through the colon.

[0002] Colonoscopes are used to perform a variety of surgical procedures in the colon. FIGS. 1 and 2 illustrate an embodiment of a conventional colonoscope. It has a handle (4) from which extends a flexible shaft (1), which is inserted into a hollow organ to be inspected. The shaft (1) consists of a proximal section (10), insertion tube (6), bending section (12) and a stiff section (13). The shaft terminates in the distal end (14), which typically houses main image lens (20), main illumination bulb (21), air/water nozzle (23) and the main instrument channel outlet (22). The main illumination bulb (21) is connected to a power source by an electric cable (26). The main illumination bulb (21) illuminates the area under the field of view of the main image lens (20). The main image lens (20) captures images of the illuminated area. The image is then transmitted through a fiber optic cable (27) and viewed through an eyepiece (2) on the handle (4) of the colonoscope. Alternatively, the image is transmitted to an image processor (not shown) by an electrical cable (27). The image is then processed and displayed on a display unit like a computer monitor. The handle (4) of the colonoscope has an extension arm (8) that attaches the colonoscope to a power source and an image processor. To enable the colonoscope to maneuver through the turns of a hollow organ, the shaft is flexible and incorporates a multitude of cables that attach the bending portion (12) with actuators (16&18). Tension is applied to these cables to move the bending portion (12) of the colonoscope in various directions. This is done by manual adjustment of actuators (16&18) on the handle (4) of the colonoscope. Typically, there are two pairs of such cables passing within the shaft, one pair for flexing the bending portion (12) in one plane and the other pair for flexing it in an orthogonal plane. It is also usual to provide two channels extending between the handle and the distal end of the shaft, a main air/water channel (25) and a main instrument channel (24). The main air/water channel (25) is used to insufflate air in a hollow organ to expand it for proper visualization. The main air/water channel (25) is connected proximally to an air/water pump (not shown) and a control switch (3); and distally to the main air/water channel outlet (23). The main image lens (20) and the main illumination bulb (21) are frequently smeared with blood, stool or other body fluids while in a hollow organ which obstructs a clear view. In such a situation, the main air/water channel (25) is used to eject water or blow air at the main image lens (20) and/or main illumination bulb (21) in order to clean them while still inside a hollow organ. The main instrument channel (24) has an inlet (7) proximally and an outlet (22) distally. It is used to pass various surgical instruments to do various surgical procedures. The main instrument channel is also connected to a suction valve (5) proximally and is also used to apply suction to remove fluids, air and other materials from within a hollow organ during examination.

[0003] Colonoscope is typically inserted into the patient either thorough a natural body orifice like anus or it is inserted through a surgical incision. It is then steered to a desired location by adjusting the bending portion (2) and manually pushing the colonoscope. After reaching the desired location, which usually is the end of the colon (cecum), the colonoscope is withdrawn. Typically it is during pullout when the inside of a hollow organ like colon is thoroughly examined. Insertion of the colonoscope into a hollow organ is a risky maneuver and is associated with significant complications like trauma, bleeding and perforation. It is generally desirable to complete the examination with a single insertion to minimize complications. The present colonoscopes have significant limitations. Many cancers and pre cancerous lesions (polyps) are frequently missed during colonoscopy (Pickhardt J et al, New England Journal of Medicine 2003; 349: 2191-2200). This has serious consequences including death, many of which can easily be prevented. There are two major reasons why significant lesions are missed during colonoscopy with a conventional colonoscope; 1) majority of the missed lesions lie on the rear side of mucosal folds (Pickhardt J et al; Annals of Internal Medicine 2004; 141: 352-360). With a conventional colonoscope, which is only forward viewing, the front of mucosal folds obstructs visualization of the rear side. Currently, rear side of a mucosal fold can only be examined by pushing the tip of the colonoscope beyond the said mucosal fold and bending it back upon itself in a ‘retro flexion’ maneuver. However, it is frequently not possible to achieve retro flexion in a narrow hollow organ like colon. Also, retro flexion maneuver compromises the forward view. With a conventional colonoscope, only one view, forward or backward, is possible at a given time. Complete examination of colon that includes both forward and rear views currently requires multiple insertions, one to obtain forward view and other to obtain backward view by retro flexion. However, intra colonic retro flexion can't be obtained frequently because colonic lumen is usually very narrow. Moreover, both retro flexion and multiple insertions, independently increase the morbidity, mortality, time and cost of colonoscopy; 2) another factor why lesions are frequently missed, is because conventional colonoscopes enable visualization of a given colonic segment only once. In best scenario, it enables visualization of a given colonic segment twice; once during insertion and once during withdrawl. However, it is to be remembered that traditionally colonic segments are not examined carefully during insertion, as the primary goal at that time is to reach the desired end point. It is only during pullout that the colonic segments are examined carefully. Prior studies have shown that multiple examination of a colonic segment leads to higher detection rate for polyps and cancer during colonoscopy, compared to single examination (Rex D K et al; Gastroenterology. 1997; 112(1): 24-28). Subsequent examination of a colonic segment detects polyps and cancers that were missed during previous examination.

[0004] In view of the significant limitations of the present colonoscope discussed above, there is a need for a colonoscope that would enable thorough and complete examination of the colon. Such a colonoscope will have means to; 1) provide both forward and rear view during a single passage through the colon; and 2) enable examination of a given segment of the colon multiple times, preferably during a single passage through the colon. In our previous application entitled “Dual View Endoscope”; (application Ser. No. 10/711,859; dated Oct. 11, 2004), we presented a colonoscope with means to provide both forward and rear views during a single passage through the colon. In the present invention, we present a colonoscope with means to examine a given segment of the colon multiple times during a single passage through the colon. This is achieved by strategically adding multiple ‘dual view modules’ to the shaft of a conventional colonoscope. A ‘dual view module’ is a solid, tubular or inflatable structure containing a forward and a rear image lens; and a forward and a rear illumination bulb. The ‘dual view module’ can be of different shapes, sizes and configurations. It is attached to the shaft of the colonoscope using one of many available mechanical articulation mechanisms. Once deployed, the ‘dual view module’ positions the forward and rear image lens to view the corresponding colonic segment. In the present invention, we present a ‘next generation colonoscope’ that contains multiple ‘dual view modules’ placed along its shaft. The ‘dual view modules’ are strategically spaced apart from one another. Once the ‘next generation colonoscope’ reaches the desired end point, the ‘dual view modules’ are deployed. As the colonoscope is pulled out, a given segment of the colon is examined multiple times during a single passage through the colon; each time with a ‘dual view module’ distal to the previous ‘dual view module’. Each ‘dual view module’ has a corresponding instrument and air/water channel located proximally; which services the said ‘dual view module’. The instrument channel enables surgical procedures to be performed seamlessly in an area under the field of view of the corresponding ‘dual view modules’. An added advantage of the ‘next generation colonoscope’ is that, by virtue of a multiple instrument channels, it enables surgical procedures to be performed at the time a lesion is detected; without having the need to postpone it till such a time when an instrument channel is suitably positioned to access the said lesion. According to another aspect, the ‘next generation colonoscope’ enables removal of multiple polyps during a single passage through the colon.

[0005] These and other advantages; and the workings of the ‘next generation colonoscope’ are discussed in details in the description and drawings, which follow. In this respect, before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting. As such, those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out one or several purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention. Additional features and advantages of the present invention will be set forth in the description and drawings which follow or may be learned by practice of the invention.

[0053] Reference will now be made in detail to the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. The following general description applies to preferred embodiments of the present invention.

[0054] The basic unit of the present invention comprises of a ‘dual view module’ (DM); as shown in FIGS. 6-20. In general terms, the ‘next generation colonoscope’ comprises of multiple ‘dual view modules’ (DM) that are placed along the length of its shaft. In the preferred embodiment of the present invention, the ‘next generation colonoscope’ contains seven ‘dual view modules’ (DM1-DM7) as shown in FIG. 3. The ‘dual view modules’ (DM1-DM7) are strategically spaced apart from each other. The different possible make, configuration and design of the ‘dual view modules’ (DM) are shown in FIGS. 6-20. Generally speaking, each ‘dual view module’ (DM) consists of; 1) a rear image lens (103) to obtain a rear view; 2) a forward image lens (105) to obtain a forward view; 3) rear illumination bulb (104) to illuminate the area under the field of view of the rear image lens (103); and 4) forward illumination bulb (106) to illuminate the area under the field of view of the forward image lens (105). The rear image lens (103) and the forward image lens (105) are connected to an image processor by an electric cable (107). This cable transmits the image obtained by the rear and forward image lens (103&105) to the image processor. After being processed, the image is then viewed on a computer monitor or any other display unit. The rear and forward illumination bulbs (104 & 106) are connected to a power source by an electric cable (108). The rear illumination bulb (104) illuminates the area under view of the rear image lens (103); and the forward illumination bulb (106) illuminates the area under view of the forward image lens (105). The ‘dual view module’ (DM) is deployed using an actuator located on the handle of the ‘next generation colonoscope’. One or all ‘dual view modules’ (DM1-DM7) may be deployed using the said actuator.

[0055] The ‘next generation colonoscope’ has a multitude instrument channels (IC1-IC7) and an air/water channels (AWC1-AWC7) that are located proximal to each ‘dual view module’ (DM1-DM7). In the preferred embodiment shown in FIG. 3, there are seven instrument channels (IC1-IC7) and seven air/water channels (AWC1-AWC7) located proximal to the corresponding ‘dual view module’ (DM1-DM7). It is also evident from FIG. 3 that the numbering pattern of the ‘dual view modules’ (DM1-DM7), instrument channels (IC1-IC7) and air/water channels (AWC1-AWC7) is similar in order to make the operation of the ‘next generation colonoscope’ user friendly. Each instrument channel (IC1-IC7) is connected to the main instrument channel (24). The passage from the main instrument channel (24) to the instrument channels (IC1-IC7) is controlled by a control valve assembly, which is shown in FIGS. 4A&4B. The control valve assembly comprises to two valves, an inlet valve (201) and an outlet valve (202). FIG. 4A shows the valves (201&202) in the closed position and FIG. 4B shows the valves (201&202) in the open position. The instrument channel (IC1-IC7) is used to pass surgical instruments to do various surgical procedures in area under view of the corresponding ‘dual view modules’ (DM1-DM7). It is also used to apply suction in the area under view of the corresponding ‘dual view modules’ (DM1-DM7). Each air/water channel (AWC1-AWC7) is connected to the main air/water channel (25). The passage from the main air/water channel (25) to the air/water channel (AWC) is controlled by a control valve assembly, which is shown in FIGS. 5A&5B. The control valve assembly comprises of an inlet valve (301) located at the air/water channel (AWC1-AWC7) inlet. FIG. 5A shows the valve (301) in the closed position and FIG. 5B shows the valve (301) in the open position. The air/water channel (AWC1-AWC7) is used to insufflate air in the area under the field of view of the corresponding ‘dual view modules’ (DM1-DM7) for better distension and visualization. The air/water channel (AWC1-AWC7) is also used to squirt water and/or air at the image lens (103&105) and illumination bulbs (104&106) of the corresponding ‘dual view modules’ (DM1-DM7). This enables cleaning of the image lens (103&105) and the illumination bulbs (104&106); while the ‘next generation colonoscope’ is still inside the colon. The passage from the main instrument channel (24) into the instrument channels (IC1-IC7); and the passage from the main air/water channel (25) into the air/water channels (AWC1-AWC7) is controlled by actuators located on the handle (4). Using these actuators, any given instrument channel (IC1-IC7) and any given air/water channel (AWC1-AWC7) can be engaged. Once a said instrument channel (IC1-IC7) is engaged, any surgical instrument passed through the main instrument channel (24) is automatically guided into the said instrument channel (IC1-IC7). Similarly suction applied through the main instrument channel (24) is directed to the said engaged instrument channel (IC1-IC7). The same concept holds true for air/water channels (AWC1-AWC7). One an air/water channel (AWC1-AWC7) is engaged, the operations of the main air/water channel (25) is directed to the said air/water channel (AWC1-AWC7). The benefits of this arrangement are discussed in detail later in the manuscript.

[0056] The ‘dual view module’ (DM) can be of any suitable make, design and configuration. Now, we will discuss some embodiments of the ‘dual view module’ (DM) that may be used with the ‘next generation colonoscope’. It is to be understood that in addition to the embodiments discussed henceforth; there may be other embodiments that could be used to achieve the purpose of the present invention. A particular embodiment of the ‘dual view module’ (DM) should not be considered limiting.

[0057] FIGS. 6A&6B show a side view of a first preferred embodiment of the ‘dual view module’ (DM). The ‘dual view module’ (DM) is a thin tubular structure encased in a sheath. It is placed along the longitudinal axis of the shaft of the ‘next generation colonoscope’. The ‘dual view module’ (DM) has a distal end (101), stiff section and bending section. The proximal end (102) of ‘dual view module’ (DM) has a rear and forward image lens (103&105); and a rear and forward illumination bulb (104&106). The rear and forward image lens (103&105) are connected to an image processor (not shown) and the illumination bulbs (104&106) are connected to a power source (not shown) by electrical cables (107&108). Two pairs of cables within the ‘dual view module’ (DM) attach the bending section of the ‘dual view module’ (DM) to an actuator. Tension on these cables moves the bending section of the ‘dual view module’ (DM) in vertical and horizontal planes. FIG. 6B shows the ‘dual view module’ (DM) of FIG. 6A wherein; the ‘dual view module’ (DM) is retro flexed. With this maneuver, the rear image lens (103) faces backwards and provides a rear view; and the forward image lens (105) faces forwards and provides a forward view. The rear illumination bulb (104) illuminates the area under view of the rear image lens (103); and the forward illumination bulb (106) illuminates the area under the view of the forward image lens (105). Because the ‘dual view module’ (DM) is thin, retro flexion can be achieved with a small radius of curvature; and thus can be performed even inside a narrow hollow organ such as colon.

[0058] FIGS. 7A&7B show a side view of the second preferred embodiment of the ‘dual view module’ (DM). The ‘dual view module’ (DM) is a solid or tubular block with a proximal end (102) and a distal end (101). The rear image lens (103) and the rear illumination bulb (104) are located on the proximal end (102); and the forward image lens (105) and the forward illumination bulb (106) are located on the outer edge of the ‘dual view module’ (DM). The rear and forward image lens (103&105) are connected to an image processor and the rear and forward illumination bulbs (104&106) are connected to a power source by electric cables (107&108). The distal end (101) of the ‘dual view module’ (DM) is attached to the shaft of the ‘next generation colonoscope’ by a hinge joint or any other suitable mechanical articulation. The distal end (101) of the ‘dual view module’ (DM) is also connected to an actuator located on the handle of the ‘next generation colonoscope’ by a pair of cables (not shown). Tension on these cables moves the proximal end (102) of the ‘dual view module’ (DM) away from and towards the shaft of the ‘next generation colonoscope’, as shown in FIG. 7B. FIG. 7B is a side view of the ‘dual view module’ (DM) of FIG. 7A wherein the ‘dual view module’ (DM) has been deployed by lifting its proximal end (102) away from the shaft using an actuator. When fully deployed, the rear image lens (103) and the rear illumination bulb (104) face backwards and give a rear view; and the forward image lens (105) and the forward illumination bulb (106) faces forwards and give a forward view. A major advantage of this embodiment of the ‘dual view module’ (DM) is that it requires only minimal additional space when deployed. This is of particular advantage when examining a narrow body cavity such as colon.

[0059] FIGS. 8A&8B show a side view of the third preferred embodiment of the ‘dual view module’ (DM). The ‘dual view module’ (DM) is a solid or tubular block with a proximal end (102) and a distal end (101). The rear image lens (103) and the rear illumination bulb (104) are located on the outer edge of the ‘dual view module’ (DM); and the forward image lens (105) and the forward illumination bulb (106) are located on the distal end (101) of the ‘dual view module’ (DM). The rear and forward image lens (103&105) are connected to an image processor and the rear and forward illumination bulbs (104&106) are connected to a power source by electric cables (107&108). The proximal end (102) of the ‘dual view module’ (DM) is attached to the shaft of the ‘next generation colonoscope’ by a hinge joint or any other suitable mechanical articulation. The proximal end (102) of the ‘dual view module’ (DM) is also connected to an actuator located on the handle of the ‘next generation colonoscope’ by a pair of cables (not shown). Tension on these cables moves the distal end (101) of the ‘dual view module’ (DM) away from and towards the shaft of the ‘next generation colonoscope’, as shown in FIG. 8B. FIG. 8b is a side view of the ‘dual view module’ (DM) of FIG. 8A wherein the ‘dual view module’ (DM) has been deployed by lifting its distal end (101) away from the shaft using an actuator. When fully deployed, the rear image lens (103) and the rear illumination bulb (104) face backwards and give a rear view; and the forward image lens (105) and the forward illumination bulb (106) faces forwards and give a forward view. A major advantage of this embodiment of the ‘dual view module’ (DM) is that it requires only minimal additional space when deployed. This is of particular advantage when examining a narrow body cavity such as colon.

[0060] FIGS. 9A&9B show a side view of the fourth preferred embodiment of the ‘dual view module’ (DM). The ‘dual view module’ (DM) comprises of two solid or tubular blocks; proximal (DMP) and distal (DMD). The rear image lens (103) and the rear illumination bulb (104) are located on the proximal block (DMP); and the forward image lens (105) and the forward illumination bulb (106) are located on the distal block (DMD). The rear and forward image lens (103&105) are connected to an image processor by electric cable (107); and the rear and forward illumination bulbs (104&106) are connected to a power source by an electric cable (108). The blocks (DMP&DMD) are attached to the shaft of the ‘next generation colonoscope’ by a hinge joint or any other suitable mechanical articulation. The blocks (DMP&DMD) are also connected to an actuator located on the handle of the ‘next generation colonoscope’ by a pair of cables (not shown). Tension on these cables moves the rectangular blocks (DMP&DMD) away from and towards the shaft of the ‘next generation colonoscope’, as shown in FIG. 9B. FIG. 9B is a side view of the ‘dual view module’ (DM) of FIG. 9A wherein the ‘dual view module’ (DM) has been deployed by lifting the two rectangular blocks (DMP&DMD) away from the shaft using an actuator. When fully deployed, the rear image lens (103) and the rear illumination bulb (104); located on the proximal rectangular block (DMP); face backwards and give a rear view; and the forward image lens (105) and the forward illumination bulb (106); located on the distal rectangular block (DMD); faces forwards and give a forward view.

[0061] FIGS. 10A&10B show a side view of the fifth preferred embodiment of the ‘dual view module’ (DM). The ‘dual view module’ (DM) is a solid or tubular block with a proximal (102) and a distal end (101). The rear image lens (103) and the rear illumination bulb (104) are placed on the proximal end (102); and the forward image lens (105) and the forward illumination bulb (106) are placed on the distal end (101) of the ‘dual view module’ (DM). The rear and forward image lens (103&105) are connected to an image processor; and the rear and forward illumination bulbs (104&106) are connected to a power source by electric cables (107&108). The ‘dual view module’ (DM) rests on a support pillar/spring (100). The support pillar/spring (100) is attached to an actuator by cables; and can be extended and retracted perpendicular to the shaft of the ‘next generation colonoscope’. FIG. 10B shows the ‘dual view module’ (DM) of FIG. 10A wherein it has been deployed by moving the support pillar/spring vertically, away from the shaft using the actuator. In this position, the rear image lens (103) and the rear illumination bulb (104) face backwards and provide a rear view; whereas the forward image lens (105) and the forward illumination bulb (106) faces forward and provide a forward view. A major advantage of this embodiment of the ‘dual view module’ (DM) is that it provides a straight rear and forward view that may be desirable for certain surgical procedures.

[0062] FIGS. 11A&11B show a side view of the sixth preferred embodiment of the ‘dual view module’ (DM). The ‘dual view module’ (DM) comprised of two solid or tubular blocks; a proximal block (DMP) and a distal block (DMD); that are attached together by a hinge joint or any other suitable mechanical articulation. The rear image lens (103) and the rear illumination bulb (104) are placed on the distal end (101) of the distal block (DMD); and the forward image lens (105) and the forward illumination bulb (106) are placed on the distal end of the proximal block (DMP). The rear and forward image lens (103&105) are connected to an image processor; and the rear and forward illumination bulbs (104&106) are connected to a power source by electric cables (107&108). The proximal end of the proximal block (DMP) is attached to the shaft of the ‘next generation colonoscope’ by means of a hinge joint or any other suitable mechanical articulation. The blocks (DMP&DMD) are attached to an actuator by cables; and can be deployed and retracted. FIG. 11B shows the ‘dual view module’ (DM) of FIG. 11A wherein it has been deployed by moving the ‘dual view module’ (DM) away from the shaft; and thereafter flipping the distal block (DMD) backwards. In this position, the rear image lens (103) and the rear illumination bulb (104) face backwards and provide a rear view; whereas the forward image lens (105) and the forward illumination bulb (106) faces forward and provide a forward view.

[0063] FIGS. 12A&12B show a side view of the seventh preferred embodiment of the ‘dual view module’ (DM). The ‘dual view module’ (DM) is a solid or tubular block placed within the shaft of the ‘next generation colonoscope’. The proximal end (102) is attached to the shaft my means of a hinge joint or any other suitable mechanical articulation. The rear image lens (103) and the rear illumination bulb (104) are placed on the distal end (101); and the forward image lens (105) and the forward illumination bulb (106) are placed on the proximal end (102) of the ‘dual view module’ (DM). The rear and forward image lens (103&105) are connected to an image processor; and the rear and forward illumination bulbs (104&106) are connected to a power source by electric cables (107&108)). The proximal end (102) of the ‘dual view module’ (DM) is connected to an actuator with the help of two cables, one on the outer edge and one on the inner edge. Tension on these cables deploys and retracts the ‘dual view module’ (DM) respectively; by flipping it upside down to 180√ as shown in FIG. 12B; wherein the ‘dual view module’ (DM) is in a deployed position. In this position, the rear image lens (103) and the rear illumination bulb (104) face backwards and provide a rear view; whereas the forward image lens (105) and the forward illumination bulb (106) faces forward and provide a forward view. Again, a major advantage of this embodiment of the ‘dual view module’ (DM) is that it provides a straight rear and forward view that may be desirable for certain surgical procedures.

[0064] FIGS. 13A&13B show a side view of the eighth preferred embodiment of the ‘dual view module’ (DM). The ‘dual view module’ (DM) is a solid rectangular or tubular block placed within the shaft of the ‘next generation colonoscope’. The distal end (101) of the ‘dual view module’ (DM) is attached to the shaft by means of a hinge joint or any other suitable mechanical articulation. The rear image lens (103) and the rear illumination bulb (104) are placed on the inner edge; and the forward image lens (105) and the forward illumination bulb (106) are placed on the outer edge of the ‘dual view module’ (DM) The rear and forward image lens (103&105) are connected to an image processor; and the rear and forward illumination bulbs (104&106) are connected to a power source by electric cable (107&108). The distal end (101) of the ‘dual view module’ (DM) is connected to an actuator with the help of two cables, one on its outer edge and one on the inner edge. Tension on these cables deploys and closes the ‘dual view module’ (DM) respectively. FIG. 13B shows the ‘dual view module’ (DM) of FIG. 13A wherein it has been deployed. In this position, the rear image lens (103) and the rear illumination bulb (104) face backwards and provide a rear view; whereas the forward image lens (105) and the forward illumination bulb (106) faces forward and provide a forward view. Again, a major advantage of this embodiment of the ‘dual view module’ (DM) is that it provides a straight rear and forward view that may be desirable for certain surgical procedures.

[0065] FIGS. 14A&14B show a side view of a ninth preferred embodiment of the ‘dual view module’ (DM). The ‘dual view module’ (DM) is a ‘L’ shaped solid or tubular structure. It is placed within the shaft of the ‘next generation colonoscope’, parallel to its long axis. The distal end (101) of the horizontal limb (DMH) of the ‘dual view module’ (DM) is connected to the shaft of the ‘next generation colonoscope’ by a hinge joint or any other suitable mechanical articulation. The rear image lens (103) and the rear illumination bulb (104) are placed on the vertical limb (DMV) of the ‘dual view module’ (DM); whereas the forward image lens (105) and the forward illumination bulb (106) are placed on the horizontal limb (DMH). The rear image lens (103) and the forward image lens (105) are connected to an image processor; and the rear illumination bulb (104) and the forward illumination bulb (106) are connected to a power source by electric cables (107&108). Two pairs of cables connect the distal end (101) of the horizontal limb (DMH) of the ‘dual view module’ (DM) to an actuator. Tension on these cables deploys and closes the ‘dual view module’ (DM) as shown in FIG. 14B. When deployed, the rear image lens (103) and the rear illumination bulb (104) face backwards; and the forward image lens (105) and the forward illumination bulb (106) face forwards. The rear image lens (103) gives a rear view and the rear illumination bulb (104) illuminates the area under view of the rear image lens (103). Similarly, the forward image lens (105) gives a forward view and the forward illumination bulb (106) illuminates the area under view of the forward image lens (105).

[0066] FIGS. 15A&15B show a side view of a tenth preferred embodiment of the ‘dual view module’ (DM). The ‘dual view module’ (DM) is a ‘L’ shaped solid or tubular structure. It is placed within the shaft of the ‘next generation colonoscope’, parallel to its long axis. The proximal end (102) of the horizontal limb (DMH) is connected to the shaft of the ‘next generation colonoscope’ by a hinge joint or any other suitable mechanical articulation. The rear image lens (103) and the rear illumination bulb (104) are placed on the horizontal limb (DMH) of the ‘dual view module’ (DM); whereas the forward image lens (105) and the forward illumination bulb (106) are placed on the vertical limb (DMV). The rear image lens (103) and the forward image lens (105) are connected to an image processor; and the rear illumination bulb (104) and the forward illumination bulb (106) are connected to a power source by electric cables (107&108). Two pairs of cables connect the proximal end (102) of the horizontal limb (DMH) of the ‘dual view module’ (DM) to an actuator. Tension on these cables deploys and closes the ‘dual view module’ (DM) as shown in FIG. 15B. When deployed, the rear image lens (103) and the rear illumination bulb (104) face backwards; and the forward image lens (105) and the forward illumination bulb (106) face forwards. The rear image lens (103) gives a rear view and the rear illumination bulb (104) illuminates the area under view of the rear image lens (103). Similarly, the forward image lens (105) gives a forward view and the forward illumination bulb (106) illuminates the area under view of the forward image lens (105).

[0067] FIGS. 16A&16B show a side view of the eleventh preferred embodiment of the ‘dual view module’ (DM). The ‘dual view module’ (DM) is a solid or tubular structure with a proximal end (102) and a distal end (101). It is placed within the shaft of the ‘next generation colonoscope’, parallel to its long axis. The ‘dual view module’ (DM) is connected along its length to the shaft of the ‘next generation colonoscope’ by a hinge joint or any other suitable mechanical articulation. The rear image lens (103) and the rear illumination bulb (104) are placed on the proximal end (102) whereas the forward image lens (105) and the forward illumination bulb (106) are placed on the distal end (101). The rear image lens (103) and the forward image lens (105) are connected to an image processor; and the rear illumination bulb (104) and the forward illumination bulb (106) are connected to a power source by electric cables (107&108). Two pairs of cables one on the outside and the other on the inside, connect the ‘dual view module’ (DM) to an actuator along its length. Tension on these cables opens and closes the ‘dual view module’ (DM) like the lid of a box; as shown in FIG. 16B. When deployed, the rear image lens (103) and the rear illumination bulb (104) face backwards; and the forward image lens (105) and the forward illumination bulb (106) face forwards. The rear image lens (103) gives a rear view and the rear illumination bulb (104) illuminates the area under view of the rear image lens (103). Similarly, the forward image lens (105) gives a forward view and the forward illumination bulb (106) illuminates the area under view of the forward image lens (105).

[0068] FIGS. 17A&17B show a side view of the twelfth preferred embodiment of the ‘dual view module’ (DM). The ‘dual view module’ (DM) consists of an inflatable balloon or any other inflatable device that is attached along the length of the shaft of the ‘next generation colonoscope’. The balloon is connected to an air pump by a thin tube placed within the shaft of the ‘next generation colonoscope’ (not shown). When inflated, the balloon has a proximal face (102) and a distal face (101) as shown in FIG. 17B. The proximal face (102) of the balloon contains the rear image lens (103) and the rear illumination bulb (104); and the distal face (101) of the balloon contains the forward image lens (105) and the forward illumination bulb (106). Electrical cables (107&108) connect the rear and forward image lens (103&105) to an image processor; and the rear illumination bulb (104) and the forward illumination bulb (106) to a power source. Inflating the balloon deploys the ‘dual view module’ (DM) as shown in FIG. 17B. When the balloon is fully inflated, the rear image lens (103) and the rear illumination bulb (104) face backwards and give a rear view. Similarly, the forward image lens (105) and the forward illumination bulb (106) face forwards and give a forward view.

[0069] FIGS. 18A&18B show a side view of the thirteenth preferred embodiment of the ‘dual view module’ (DM). The ‘dual view module’ (DM) consists of a solid hemisphere. It is attached perpendicular to the long axis of the shaft of the ‘next generation colonoscope’. The proximal face (102) of the hemisphere contains the rear image lens (103) and the rear illumination bulb (104); and the distal face (101) of the hemisphere contains the forward image lens (105) and the forward illumination bulb (106). Electrical cables (107&108) connect the rear and forward image lens (103&105) to an image processor; and the rear illumination bulb (104) and the forward illumination bulb (106) to a power source. The ‘dual view module’ (DM) is deployed by flipping it 180 , as shown in FIG. 18B. When the hemisphere is flipped 180°, the rear image lens (103) and the rear illumination bulb (104) face backwards and give a rear view; and the forward image lens (105) and the forward illumination bulb (106) faces forwards and gives a forward view.

[0070] FIGS. 19A&19B show the fourteenth preferred embodiment of the ‘dual view module’ (DM). The ‘dual view module’ (DM) is a long and thin tubular structure encased in a sheath. It has a shaft that comprises of a distal end (101), stiff section, bending section and proximal section. The shaft is attached proximally to a handle (not shown). The handle has an extension that connects the ‘dual view module’ (DM) to an image processor and a power source. The rear image lens (103) and rear illumination bulb (104) are placed on the distal end (101), whereas the forward image lens (105) and the forward illumination bulb (106) are placed along the inner edge of the ‘dual view module’ (DM). The rear and forward image lens (103&105) and the rear and forward illumination bulbs (105&106) are connected to an image processor and a power source respectively by electrical cables (107&108). The bending section of the ‘dual view module’ is connected to an actuator by cables. Tension on these cables moves the bending section in vertical and horizontal planes. This entire assembly is thin enough to pass through the main instrument channel (24) of the endoscope. FIG. 19B shows the deployment of the ‘dual view module’ of FIG. 19A. The ‘dual view module’ (DM) is passed through the main instrument channel (24) into the corresponding instrument channel (IC) of the said ‘dual view module’ (DM). Dual view is obtained by retro flexing the ‘dual view module’ (DM) as shown in FIG. 19B. In this position, the rear image lens (103) and the rear illumination bulb (104) face backward and the forward image lens (105) and the forward illumination bulb (106) face forwards. The rear image lens (103) gives a rear view and the rear illumination bulb (104) illuminates the area under the view of the rear image lens (103). Similarly, the forward image lens (105) gives a forward view and the forward illumination bulb (106) illuminates the area under the view of the forward image lens (105). It is evident from the discussion above that in order for this embodiment of the ‘dual view module’ (DM) to work with the ‘next generation colonoscope’; the main instrument channel (24) will have to be wide enough to accommodate multiple such ‘dual view modules’ (DM).

[0071] The ‘dual view modules’ that have so far been discussed; are all retractable. This is done to ensure that the shaft of the ‘next generation colonoscope’ remains smooth in order to facilitate safe insertion into the colon. However, a non retractable ‘dual view module’ (DM) can also be used; as illustrated in FIG. 20. The non retractable ‘dual view modules’ (DM) consists of a solid hemisphere. It is attached perpendicular to the long axis of the shaft of the ‘next generation colonoscope’. The proximal face (102) of the hemisphere contains the rear image lens (103) and the rear illumination bulb (104); and the distal face (101) of the hemisphere contains the forward image lens (105) and the forward illumination bulb (106). Electrical cables (107&108) connect the rear and forward image lens (103&105) to an image processor; and the rear illumination bulb (104) and the forward illumination bulb (106) to a power source. The rear image lens (103) and the rear illumination bulb (104) face backwards and give a rear view; and the forward image lens (105) and the forward illumination bulb (106) faces forwards and gives a forward view. The hemispheres appear as bumps on the shaft of the ‘next generation colonoscope’. Instead of a smooth surface, the shaft now has a bumpy surface. To enable safe and painless insertion of the ‘next generation colonoscope’ into the colon, it is recommended that the ‘dual view modules’ (DM) not protrude too much outside of the shaft.

[0072] Operation:

[0073] Once the colonoscope reaches the desired end point; which usually is the cecum; the ‘dual view modules’ are deployed using an actuator located on the handle of the ‘next generation colonoscope’ as shown on FIG. 21A. Either all or selected ‘dual view modules’ can be deployed using the actuator. The ‘dual view modules’ are numbered sequentially; distal to proximal; which in the preferred embodiments is from DM1-DM7, as shown in FIGS. 3, 21A&21B; DM1 being the distal most and DM7 being the proximal most ‘dual view module’. Deployment of a ‘dual view module’ activates its image lens and illumination bulbs; and positions its forward and rear image lens to visualize the corresponding ‘view unit’. The field of view under the rear and forward image lenses of adjacent ‘dual view modules’ (DM) is referred to as a ‘view unit’. In the illustrated example shown in FIGS. 21A&21B; the ‘view units’ are numbered; distal to proximal; from VU0-VU7; VU0 corresponding to the area under the field of view of the main image lens and the forward image lens of the ‘dual view module’ #1 (DM1); VU1 corresponding to the area under the field of view of the rear image lens of ‘dual view module’ #1 (DM1) and forward image lens of ‘dual view module’ #2 (DM2); and so on. Now referring to FIGS. 21A, 21B&22; we illustrate the examination of colon using the ‘next generation colonoscope’. Once the ‘next generation colonoscope’ reaches the desired end point, the ‘dual view modules’ (DM1 -DM7) are deployed and images are viewed on a display unit (220); such as a computer monitor, television screen and the like. Image from each image lens is viewed separately; and images from corresponding image lenses forming a ‘view unit’ are paired together. For example, as shown in FIG. 22A, image #2 (IM2) is a view of the ‘view unit’ #2 (VU2); comprising of image from the forward image lens of the 3^rd dual view module (DM3(F)) and image from the rear image lens of the 2^nd dual view module (DM2(R)). To make the visualization of a colonic segment simpler, the images from the corresponding image lenses of a ‘view unit’ can be combined, using an image processor and image processing software, to give a consolidated image; as shown in FIG. 22B. Referring again to FIG. 22B, image #2 (IM-VU2) is a consolidated display of images of ‘view unit’ #2, which in turn comprises of images from the forward image lens of the 3^rd dual view module (DM3(F)) and rear image lens of the 2^nd dual view module (DM2(R)). Now turning our attention back to FIGS. 21A&21B, it is evident that the presence of multiple ‘dual view modules’ enables the ‘next generation colonoscope’ to examine a given colonic segment multiple times during a single passage through the colon. The number of times a given colonic segment will be examined will depend on the number of ‘view units’ (VU0-VU7) distal to the said colonic segment when the distal end of the ‘next generation colonoscope’ is at the desired end point. For example, as shown in FIGS. 21A&21B, the colonic segment one (CS1) will be examined 8 times; sequentially by ‘view units’ VU7, VU6, VU5, VU4, VU3, VU2, VU1 and VU0; by the time the ‘next generation colonoscope’ is completely withdrawn from the colon. This is a huge advantage compared to the conventional colonoscopes; wherein a colonic segment is examined only once; using the main image lens (20) with its field of view (VUM). Drawing from the conclusion of prior studies that demonstrate a higher detection rates for polyps and other lesions by repeated examination of a colonic segment (Rex DK et al; Gastroenterology. 1997; 112(1): 24-28); we conclude that the ‘next generation colonoscope’ will enable endoscopists to detect polyps, cancer and other lesions; that are otherwise missed by conventional colonoscopes. From FIGS. 21A&21B it is also evident that proximal segments of the colon will be examined more times compared to the distal segments. For example, colonic segment #1 (CS1) will be examined 8 times; sequentially by ‘view units’ VU7, VU6, VU5, VU4, VU3, VU2, VU1 and VU0; whereas colonic segment #2 (CS2) will examined only 4 times; by view units VU3, VU2, VU3 and VU0 respectively. To maximize the examination of the distal colonic segments, we propose two solutions; 1) providing more ‘dual view modules’ in the distal part of the colonoscope; and 2) placing the distal ‘dual view modules’ closer than the proximal ‘dual view modules’. In the illustrated embodiment of the ‘next generation colonoscope’ shown in FIGS. 3, 21A&21B; five of the seven ‘dual view modules’ (DM1-DM5) have been placed in the distal half of the colonoscope; and the distal four ‘dual view modules’ (DM1-DM4) are placed closer together compared to their more proximal counterparts. Together, this enables the distal segments of the colon to be examined more number of times than would have been possible if the ‘dual view modules’ (DM1-DM7) were equally spaced apart.

[0074] We do understand that a given ‘dual view module’ (DM1-DM7) may not provide a complete 360° view of the colonic lumen to enable a complete examination of the corresponding colon segment. We propose three solutions to this problem; 1) as the ‘next generation colonoscope’ is pulled out of the colon, it usually a torques along its long axis; just like a conventional colonoscope. To enable complete 360° visualization of the colon, we recommend that this torque should be further augmented by applying additional intentional torque to the ‘next generation colonoscope’ during pullout. The above maneuver essentially enables each ‘dual view module’ (DM1-DM7) to view a given colonic segment from a different angle. We believe that by the time a given colonic segment is examined by multiple ‘dual view modules’ (DM1-DM7) from different angles, a complete 360° visualization of the said colonic segment will be obtained; 2) another way to address this problem is to provide more than one ‘dual view module’ (DM) at each location on the shaft of the ‘next generation colonoscope’; for example two ‘dual view modules’ (DM), each with a 180° field of view; 3) yet another way to obtain a complete 360° visualization of a colonic segment is by placing each ‘dual view module’ (DM1-DM7) along a different longitudinal axis along the shaft of the ‘dual view module’ is that during pullout, different ‘dual view modules’ (DM1-DM7) view a given colonic segment from different angles; thereby enabling a complete 360° visualization of the said colonic segment by the time the ‘next generation colonoscope’ is completely pulled out.

[0075] Another advantage of the ‘next generation colonoscope’ is that it enables faster examination of the colon; thus enabling more colonoscopies to be performed in a given period of time. This is particularly important at the present time, when there is not enough manpower to meet the colonoscopy need of many communities in the United States. Many patients who are in need for colonoscopy for colon cancer prevention; are unable get one because of the lack of enough endoscopists. One way to improve the access to colonoscopy is to design a colonoscope that will enable physicians to perform colonoscopies in a more time efficient manner. With the conventional colonoscopes, examination of the colon is done using a single image lens; the main image lens (20) as shown in FIG. 21C. During a typical colonoscopy, the endoscopist examines the colon mostly during pullout; and to some extent during insertion. After reaching the desired end point, which usually is the cecum, the colonoscope is slowly pulled out and the area under the field of view of the main image lens (20); hereby referred to as ‘main view unit’ (VUM); is carefully examined. The ‘main view unit’ (VUM) of the main image lens (20) covers a relatively small area; hence only a very small area of the colon is visualized at any given time. The endoscopist has to sequentially examine each segment of the colon under the field of view of the main image lens (VUM). As a result, examination of the entire colon is a time consuming process. The ‘next generation colonoscope’ enables faster examination of the colon. Once the ‘next generation colonoscope’ reaches the desired end point, which usually is the cecum, the ‘dual view modules’ (DM1-DM7) are deployed. At this point; as shown in FIGS. 21A&21B; the total area of the colon under the field of view of a fully deployed ‘next generation colonoscope’ is the sum of all ‘view units’ (VU0+VU1+VU2+VU3+VU4+VU5+VU6+VU7); which is far greater than the area under the field of view of a conventional colonoscope at any given time; which is only the ‘main view unit’ (VUM). The end result of examination by a ‘next generation colonoscope’ is that by the time the most proximal ‘dual view module’ (DM7) is outside of the anal verge, the entire colon has been examined by one or more ‘dual view modules’ (DM1-DM7). At this point the colonoscope can be safely pulled out completely; without compromising on the completeness of the examination. It is to be appreciated that not only entire colon has been visualized by the time most proximal ‘dual view module’ (DM7) is outside of the anal verge, but major part of the colon has been examined more than once. It is only fair to conclude that the ‘next generation colonoscope’ not only enables faster examination, but also enables a more complete and thorough examination of the colon. The examination of the colon can be made even faster and more accurate by inserting the colonoscope with the ‘dual view modules’ (DM1-DM7) fully deployed. This will enable visualization of a given segment of the colon both during insertion and pullout. The end result of this practice will be that a given segment of the colon will be examined more times; compared to when the ‘dual view modules’ (DM1-DM7) are deployed only during pullout.

[0076] As shown in FIGS. 3, 21A&21B; each ‘view unit’’(VU1-VU7) of the ‘next generation colonoscope’ is serviced by an air/water channel (AWC1-AWC7)) and an instrument channel (IC1-IC7). The air/water channels (AWC1-AWC-7) and the instrument channels (IC1-IC7) are numbered, distal to proximal, which in the preferred embodiment is from 1-7. To simplify the operation of the ‘next generation colonoscope’, the numbering of the air/water channels (AWC1-AWC7) and the instrument channels (IC1-IC7) is similar to that of the ‘view units’ (VU1-VU7). For example, in the illustrated embodiment, air/water channel (AWC) #2 (AWC2) will need to be engaged to insufflate air in area under the field of view of the ‘view unit’ #2 (VU2). Similarly, instrument channel #2 (IC2) will need to be engaged to perform surgical procedures or apply suction in area under the field of view of the ‘view unit’ #2 (VU2). Because of the similar numbering pattern of the ‘view units’ (VU1-VU7), air/water channels (AWC1-AWC7) and instrument channels (IC1-IC7), operation of the ‘next generation colonoscope’ is fairly simple and straightforward. It is also evident from FIGS. 3, 21A&21B; the view unit #0 (VU0) is serviced by the main instrument channel (24) and the main air/water channel (25).

[0077] A major advantage of the ‘next generation colonoscope’ is that it enables surgical procedures to be performed at the same time lesions are detected. It is critically important to remove a lesion, such as a polyp, at the same time it is detected during colonoscopy, as subsequent examination may fail to detect the said polyp, especially if it is small. With the ‘next generation colonoscope’ this is made possible by the presence of a separate instrument channel (24, IC1-IC7) for each ‘view unit’ (VU0-VU7). Once a polyp is detected in an area under the filed of view of a given ‘view unit’(VU0-VU7), the corresponding instrument channel (24, IC1-IC7) is engaged using an actuator (not shown) located on the handle (4). An appropriate surgical instrument is passed through the main instrument channel (24); which is then automatically guided into the said engaged instrument channel (IC1-IC7). To operate in an area under the field of view of ‘view unit’ #0 (VU0), the main instrument channel (24) and the main instrument channel outlet (21) is used. The surgical instrument is then used to perform surgical procedures in the area under the field of view of the said ‘view unit’ (VU0-VU7) where the said lesion was detected.

[0078] Another advantage of the ‘next generation colonoscope’ is that multiple polyps can be removed in a single passage through the colon. Presently, when a polyp is identified, it is cut off from the colon using one of many techniques, using a biopsy forceps or a snare. If a polyp is smaller than the diameter of the main instrument channel (24), it is retrieved by pulling it through the said main instrument channel (24). If the polyp size is greater than the diameter of the main instrument channel (24), a ‘polyp retrieval assembly’ (400); shown in FIG. 23A; is used. FIG. 23A shows a conventional ‘polyp retrieval assembly’ (400); whereas FIGS. 23B&23C show the present method of polyp (POL) retrieval using a conventional colonoscope. The ‘polyp retrieval assembly’ (400) comprises of an introducer (402) and a net (403) encased in a sheath (401). When a polyp (POL) has to be removed from inside the colon, the ‘polyp retrieval assembly’ (400) is passed through the main instrument channel (24) to the location of the said polyp (POL). The introducer (402) is then advanced which pushes the net (403) out of the sheath (401) and deploys it. The deployed net (403) is then maneuvered to engage the said polyp (POL). Once the polyp (POL) is engaged, the introducer (402) is pulled back into the sheath (401) as far as possible. The result of this maneuver is that the said polyp (POL) is securely grasped within the net (403). The colonoscope is then pulled out with the ‘polyp retrieval assembly’ (400) still inside the main instrument channel (24). When the colonoscope is completely out of the colon, the introducer (402) is re advanced to loosen the net (403) and the polyp (POL) is manually captured and sent to a pathologist. The ‘polyp retrieval assembly’ (400) is then completely pulled out of the main instrument channel (24). With the current ‘polyp retrieval assembly’ (400) only one polyp can be pulled out at one time. If more than one polyp is found during colonoscopy, the colonoscope has to be reinserted into the colon and advanced to the location of the said polyp. As evident from the above discussion, the more the number of polyps found, the more complicated the process gets. The shortcomings of the present system are; 1) it requires multiple insertions; which significantly increases the risk of complications like perforation and bleeding; 2) it is labor intensive and time consuming; and 3) even more concerning is the fact that a polyp that is detected on initial examination; may not be found during subsequent examinations.

[0079] We propose three methods which can be used with the ‘next generation colonoscope’ to address the shortcomings of the present method. 1) The ‘next generation colonoscope’ has multiple instrument channels (IC1-IC7). Even while one instrument channel (IC1-IC7) is engaged with a ‘polyp retrieval assembly’ (400); other instrument channels (IC1-IC7) remain free to remove other polyps. In order to use more than one instrument channel (IC1-IC7) and/or to pass more than one surgical instrument, the diameter of the main instrument channel (24) and/or that of the surgical instruments may have to be altered (24); 2) the second method includes suctioning the polyp into the empty ‘dual view module bay’ (the empty space in the shaft of the ‘next generation colonoscope when the corresponding ‘dual view module’ (DM1-DM7) has been deployed); using suction through the instrument channel (IC1-IC7). Alternatively, a separate suction outlet can be provided in each ‘dual view module bay’ for this purpose. Once the polyp is securely suctioned in the ‘dual view module bay’, the colonoscope is pulled out. The polyp is retrieved when the said ‘dual view module bay’ is outside of the anal verge; 3) the third method involves changing the make, configuration and design of the ‘polyp retrieval assembly’ (400), which is discussed next.

[0080] We propose a ‘next generation polyp assembly’ (500) as shown in FIG. 24A; which is optimally designed to be used with the ‘next generation colonoscope’. It comprises of a net (503) attached to an introducer (502); encased in a sheath (501). In contrast to the conventional ‘polyp retrieval assembly’ (400), the net (503) of the ‘next generation polyp retrieval assembly’ (500) can be detached from the introducer (502) using an actuator located on proximal end of the introducer (502), as shown in FIG. 24A. The method of removing a polyp (POL) using the ‘next generation polyp retrieval assembly’ (500) is shown in FIGS. 24B&24C. Once a polyp (POL) is grasped in the net (503), the introducer (502) is pulled back, which brings the polyp (POL) and the net (503) as close as possible to the instrument channel (IC). At this time, the proximal end of the net (503) is inside the said instrument channel (IC). The net (503) is then separated from the introducer (502) using the actuator on the proximal end of the introducer (502); subsequent to which the introducer (502) and the overlying sheath (501) is pulled out of the main instrument channel (24). This leaves the main instrument channel (24) free to be used for other surgical procedures during the same passage. Once the proximal part of the net (503) is trapped inside the instrument channel (IC), it is important to secure its position to prevent it from falling off. To achieve this goal, the exit valve of the instrument channel (202) is utilized. The control valve assembly of the instrument channel is closed once the introducer (502) is pulled out of the instrument channel (IC). The exit valve (202) grasps the net (503) that is nestled in the instrument channel (IC). This stabilizes the net (503); with a polyp (POL) inside; during pullout of the ‘next generation colonoscope’. Once the said instrument channel (IC) is outside of the anal verge, the exit valve (202) is opened and the net (503), along with the captured polyp (POL) is retrieved.

[0081] Any person/persons familiar with prior art will understand that modifications or changes to the present invention can be made without compromising its spirit and principles. Some possible variation of the preferred embodiments of the present invention are; 1) the relative positions of the ‘dual view module’, air/water channel and the instrument channel can be interchanged; 2) moreover, the air/water and/or instrument channels can be positioned within the ‘dual view modules’; 3) the shape, composition, design and configuration of the ‘dual view module’ can be modified or changed; 4) the method of deployment of the ‘dual view module’ can be modified; 5) in the preferred embodiments of the present invention, the ‘dual view module’ provides both forward and rear views, however modules with only forward or rear view can be provided; 6) although the preferred embodiments of the present invention discuss ‘colonoscope’ and ‘colon examination’; the principles of the present invention can be applied to any endoscopic device; and endoscopic examination of any body organ or any hollow cavity; 7) in the preferred method of colon examination, the ‘dual view modules’ remain deployed during the entire pullout of the colonoscope. However the ‘dual view modules’ can be deployed and retracted any number of times during pullout. Similarly, the ‘dual view modules’ can be deployed and retracted any number of times during insertion into the colon; 8) the ‘dual view modules’ in addition to having means for deployment, can also have means to move around once it has been deployed. Means can be provided to move the ‘dual view modules’ up, down, left and right. This will give the endoscopist more control over determining the field of view of each ‘dual view module’. The above examples are only illustrative and by no means all inclusive.