ENDOSCOPE TIP PART WITH IMPROVED OPTICAL PROPERTIES

Abstract

An endoscope tip part including a tip housing at least partially enclosing an interior cavity and including a window, and a vision assembly accommodated in the interior cavity and including an imaging subassembly including an image sensor viewing in an optical direction through the window of the tip housing, a light source comprising an illumination surface for emitting light, a separate frame component including a light shielding wall made of an opaque material and extending between the image sensor and the light source so as to at least partially shield the image sensor from light emitted from the light source.

Claims

1. An endoscope tip part for an endoscope, the endoscope tip part comprising: a tip housing defining an interior cavity, the tip housing including a window having an exterior window surface facing an exterior of the endoscope tip part and an interior window surface facing the interior cavity; and a vision assembly accommodated in the interior cavity and including: an imaging subassembly comprising an image sensor viewing in an optical direction through the window; a light source comprising an illumination surface to emit light in an illumination direction; and a frame component supporting, and fixing positions of, the imaging subassembly and the light source relative to each other, wherein the frame component comprises a light shielding wall made of an opaque material and including an end wall extending transversely to the optical direction and a side wall connected to and extending distally from the end wall, the imaging subassembly positioned distally of the end wall, and the light shielding wall extending between the image sensor and the light source so as to at least partially shield the image sensor from light emitted from the light source.

2. The endoscope tip part of claim 1, wherein the imaging subassembly comprises a lens barrel and a lens arranged in the lens barrel, and wherein the lens barrel is positioned distally of the image sensor.

3. The endoscope tip part of claim 1, wherein the illumination surface is arranged proximally relative to the image sensor.

4. The endoscope tip part of claim 3, wherein the vision assembly includes a light guide part comprising a light guide having a light entry surface and a light exit surface, wherein the light entry surface is aligned with the illumination surface to receive the light from the light source, and wherein the light guide propagates the light through the light exit surface and out through the window.

5. The endoscope tip part of claim 4, wherein the side wall extends between the imaging subassembly and the light guide.

6. The endoscope tip part of claim 5, wherein the illumination surface is attached to the light entry surface.

7. The endoscope tip part of claim 1, wherein the vision assembly includes an electrical circuit comprising an imaging circuit portion in electrical communication with the image sensor to transmit an image signal generated by the image sensor indicative of the view in the optical direction, wherein the frame component comprises an imaging attachment surface, and wherein the imaging circuit portion is attached to the imaging attachment surface.

8. The endoscope tip part of claim 7, wherein the imaging circuit portion is adhered to the imaging attachment surface.

9. The endoscope tip part of any one of claim 8, wherein the electric circuit comprises a main circuit portion in electrical communication with the imaging circuit portion, the main circuit portion having a bend arranged around the frame component.

10. The endoscope tip part of claim 7, wherein the electrical circuit comprises a bridge circuit portion and an illumination circuit portion, the illumination circuit portion being in electrical communication with the light source and being electrically connected to the main circuit portion by the bridge circuit portion.

11. The endoscope tip part of claim 10, wherein the bridge circuit portion has a wave-shaped extent along the optical direction.

12. The endoscope tip part of claim 10, wherein the light source is a first light source and the bridge circuit portion is a first bridge circuit portion, further comprising a second light source and a second bridge circuit portion, and wherein the electrical circuit has a slit separating the first bridge circuit portion and the second bridge circuit portion.

13. The endoscope tip part of claim 12, wherein the frame component comprises a first illumination attachment surface and a second illumination attachment surface, and wherein the first light source is supported by the first illumination attachment surface and the second light source is supported by the second illumination attachment surface.

14. The endoscope tip part of claim 13, wherein the illumination circuit portion is a first illumination circuit portion affixed to the first illumination attachment surface and supporting the first light source, further comprising a second illumination circuit portion affixed to the second illumination attachment surface and supporting the second light source.

15. An endoscope comprising: a handle; an endoscope tip part according to claim 1; an insertion cord extending from the handle to the endoscope tip part; and one or more cables running through the insertion cord and electrically connecting the endoscope tip part with the handle.

16. An endoscope system comprising a monitor and an endoscope according to claim 15, wherein the endoscope is connectable to the monitor, and wherein the monitor is configured to display an image captured by the image sensor.

17. A method for assembling a vision assembly for an endoscope tip part, the method comprising: providing an image sensor viewing in an optical direction, a light source comprising an illumination surface to emit light in an illumination direction, a light guide part comprising a light guide having a light entry surface and a light exit surface and being configured to receive light from the illumination surface through the light entry surface and to emit said light through the light exit surface, and a frame component including a light shielding wall made of an opaque material and including an end wall extending transversely to the optical direction and a side wall connected to and extending distally from the end wall; performing a first alignment sequence to align the image sensor with the frame component, the first alignment sequence comprising: axially translating the image sensor against the frame component; and transversely translating the frame component and the image sensor; after the first alignment sequence, affixing the image sensor to the frame component to obtain a first subassembly; performing a second alignment sequence comprising: aligning the light source with a light guide of the light guide part by translating the light exit surface of the light guide; and affixing the light source to the light entry surface of the light guide to obtain a second subassembly; and performing a third alignment sequence: aligning the first subassembly and the second subassembly; and affixing the second subassembly to the frame component.

18. The method of claim 17, further comprising: providing a tip housing defining an interior cavity and having a proximal opening providing access to the interior cavity, the tip housing including a window having an exterior window surface facing an exterior of the endoscope tip part and an interior window surface facing the interior cavity; inserting the vision assembly through the proximal opening with the optical direction traversing the window so that the light guide propagates the light received through the light entry surface through the light exit surface and out through the window; and sealing the proximal opening so that the interior cavity is fluid-sealed.

19. The method of claim 17, further comprising providing a first jig, a second jig, and a third jig, wherein axially translating the image sensor against the frame component comprises translating the image sensor against the frame component until the frame component abuts an axial stop surface of the first jig, wherein transversely translating the frame component and the image sensor comprises transversely translating the frame component and the image sensor until the frame component abuts a transverse stop surface of the first jig, wherein aligning the light source with the light guide of the light guide part comprises placing the light source in the second jig, wherein affixing the light source to the light entry surface of the light guide comprises applying an adhesive to the illumination surface, wherein aligning the first subassembly and the second subassembly comprises placing the first subassembly and the second subassembly in the third jig and translating the frame component until the light exit surface abuts an axial stop surface of the third jig.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0086] Embodiments of this disclosure will be described in more detail in the following with regard to the accompanying figures. The figures show one way of implementing the present invention and are not to be construed as being limiting to other possible embodiments falling within the scope of the attached claim set.

[0087] FIG. 1 is a schematic perspective illustration of an endoscope according to this disclosure,

[0088] FIG. 2 is a schematic perspective illustration of a monitor connectable to the endoscope,

[0089] FIG. 3 is a schematic perspective illustration of a distal end of the endoscope shown in FIG. 1 showing an endoscope tip part of the endoscope in greater detail,

[0090] FIGS. 4A, 4B, and 5A are schematic perspective views of a vision assembly accommodated in the endoscope tip part shown in FIG. 3 from a proximal, distal, and lower direction, respectively,

[0091] FIG. 5B is a schematic illustration of a cross-section along the longitudinal axis of the endoscope tip part and through light guides of the vision assembly,

[0092] FIG. 6A is a schematic illustration of a cross-section along the longitudinal axis of the endoscope tip part and perpendicular to the cross-section of FIG. 5B,

[0093] FIG. 6B is a schematic illustration of cross-section perpendicular the longitudinal axis of the endoscope tip part and through light guides of the vision assembly,

[0094] FIGS. 7A-7C are schematic perspective illustrations of a frame component of the vision assembly alone,

[0095] FIGS. 8A-8B are schematic perspective illustrations of a first alignment sequence involving a first jig,

[0096] FIGS. 9A-9D are schematic perspective illustrations of a second alignment sequence involving a second jig, and

[0097] FIGS. 10A-10B are schematic perspective illustrations of a third alignment sequence involving a third jig.

DETAILED DESCRIPTION OF THE INVENTION

[0098] FIG. 1 illustrates an endoscope 1, which is disposable and not intended to be cleaned and reused. The endoscope 1 comprises a distal tip part 50, a handle 20 with a handle housing 22 for gripping and a control lever 21, an insertion cord 30, which may also be known as an insertion tube, for insertion into a patient and extending between the handle 20 and a proximal end 41 of a bending section 40, and a vision assembly 100 (best seen in FIGS. 4A-5A) positioned in the distal tip part 50. The vision assembly 100 is in signal communication with a circuit (not shown) of the handle 20 via data and power cables 159 (as best seen in FIGS. 4A-5A). The insertion cord 30 has an exterior tubular surface facing the surroundings of the endoscope 1. Furthermore, a working channel (not shown) run along the inside of the insertion cord 30 from a working channel opening 27 of the handle 20 to a distal tip working channel opening 72 of the distal tip part 50, which is best seen in FIGS. 5B-6B. The working channel allows liquid or air to be added to and/or removed from the body cavity or allows the insertion of medical tools or surgical instruments into the body cavity. The bending section 40 comprises articulated segments 43 and hinges 44 connecting the segments 43, which is best seen in FIG. 3. Two steering wires (not shown) run from the distal tip 50 to the control lever 21 of the handle 20. The control lever 21 can, upon manipulation, tension a respective steering wire to articulate the bending section 40, thereby allowing the operator to steer the distal tip 50 during endoscopy. The segments and hinges are covered by a thin outer sleeve 42, thereby providing an additional layer of sealing for the connection between the distal tip part 50 and the bending section 40. The thin outer sleeve 42 also provides a smooth outer surface for the bending section 40 to improve the comfort of a patient undergoing endoscopy.

[0099] In FIG. 2, a monitor 11 is shown. The monitor 11 comprises a cable socket 12 to which a monitor cable 13 of the endoscope 1 (shown in FIG. 1) can be connected to establish signal communication between the vision assembly 100 (shown in FIGS. 4A-5A) of the endoscope 1 and the monitor 11 via the circuit. The monitor 11 display images and/or video captured by the camera of the endoscope 1 thus allowing an operator to “see” the body cavity through the camera of the endoscope 1.

[0100] Turning to FIG. 3, the endoscope tip part 50 can be seen in greater detail attached to the bending section 40 (the outer sleeve of the bending section 40 is omitted for visualisation purposes). The tip part 50 comprises a tip housing 60 having an exterior housing surface 64 defining the exterior surface of the tip part 50. The tip housing 60 comprises a cylindrical shell-shaped circumferential wall 68 extending circumferentially around a longitudinal axis 52 and surrounding an interior cavity 62, as best seen in FIGS. 5B and 6A. The circumferential wall 68 is closed at a distal end of the tip housing 60 by a distal end wall 69 and has a proximal opening 63 (as best seen in FIGS. 5B and 6A), which provides the only access to the interior cavity 62, at the opposite end of the tip housing 60. The tip housing 60 comprises an opaque portion and a transparent portion including a window 65 arranged in the distal end wall 69. The window 65 has an interior surface 66 (as best seen in FIGS. 5B and 6A) facing the sealed interior cavity 62 and an exterior window surface 67 forming part of the exterior surface 51 of the tip housing 60. The tip housing is preferably manufactured by two-shot injection moulding processes so that the transparent portion (including the window 65) is formed by a transparent polymer material shot of the two shot injection moulding process and the opaque portion is formed by an opaque polymer material shot of the two shot injection moulding process. Thus, the tip housing 60 is formed as a monolithic, i.e. single, polymer piece. The tip part 50 further comprises a separately formed sealing element (not shown) arranged in and sealing the proximal opening 63 via an adhesive, thereby fully liquid- and gas-sealing the air-filled interior cavity 62. The sealing element may be a polymer plug and an adhesive may fix and seal a gap between this plug and the interior surface of the tip part 50. The sealing element may further fixate the vision assembly by pushing the vision assembly axially along the longitudinal direction against the tip housing 60.

[0101] Inside the tip part 50, a vision assembly 100 is accommodated in the interior cavity 62, which is shown in detail in FIGS. 4A, 4B, and 5A. The vision assembly 100 comprises an imaging subassembly 110, two light sources 120A, 120B, a light guide part 130, an electrical circuit 150, and a frame component 160. In this disclosure, the suffixes A and B denote an element belonging to the first light source 120A and the second light source 120B, respectively. FIGS. 4A, 4B, and 5A illustrate the vision assembly 100 without the tip housing 60. A first subassembly 115 may comprise the imaging subassembly 110 and the frame component 160. A second subassembly 116 may comprise the two light sources 120A, 120B and the light guide part 130.

[0102] The imaging subassembly 110 is best seen in FIG. 4A-5A and comprises an image sensor 111 viewing in an optical direction 112 through a lens barrel 113. The imaging subassembly 110 is arranged so that the optical direction passes through the window 65 of the tip housing 60, as best seen in FIGS. 5B-6B. The lens barrel 113 comprises several lenses enclosed in an opaque barrel typically provided by a polymer cylinder with an opaque, e.g. black, coating or paint extending circumferentially around on the outside of the cylinder. The lenses optimise the view of the image sensor 111 and the barrel forms an optical barrier, which reduces stray light entering the image sensor 111. In some variations, the lens barrel 113 may be omitted.

[0103] The two light sources 120A, 120B are best seen in FIGS. 4A-5A and are provided as a single phosphor-based light-emitting diode configured for emitting substantially white light. Each light source 120A, 120B comprises a single semiconductor die (not shown) for emitting light in an illumination direction 122A, 122B and surrounded by an epoxy-based cover with a planar exterior surface forming an illumination surface 121A, 121B. The illumination surfaces 121A, 121B are adhered to a light entry surface 132A, 132B of a respective light guide 131A, 131B by an adhesive. The light sources 120A, 120B are arranged proximally relative to the image sensor 111 to provide a more compact vision assembly 100. Alternatively, each light source could be the distal end of a respective optical fibre transporting light from an LED arranged in the handle of the endoscope.

[0104] The light guide part is best seen in FIG. 5B and comprises two light guides 131A, 131B, one for each light source 120A, 120B. The light guides 131A, 131B are spaced apart by a gap and extend in parallel along a respective straight longitudinal central centre line. Each light guide 131A, 131B has a respective light entry surface 132A, 132B, a light exit surface 133A, 133B and a circumferential surface 134A, 134B (best seen in FIGS. 4A-5A) extending from the light entry surface 132A, 132B to the light exit surface 133A, 133B around a respective longitudinal central centre line (coinciding with the respective illumination direction 122A, 122B shown in FIG. 5B). Each light guide 131A, 131B is configured for receiving light from its respective light source 120A, 120B through its light entry surface 131A, 131B and propagates the light through its light exit surface 133A, 133B and out through the window 65 of the tip housing 60. The light entry surfaces 132A, 132B and the light exit surfaces 133A, 133B are planar and parallel, and the circumferential surfaces 134A, 134B define a polymer-air interface between the light guide part 130 and the interior cavity 62. The light guide part 130 further includes a crossmember 135 extending transversely from a proximal end of the first light guide 131A to a proximal end of the second light guide 131B over the gap between the light guides 131A, 131B. The light guide part 130 is monolithically formed of a rigid and transparent polymer material with a refractive index that is higher than the refractive index of air. This ensures that the critical angle for total internal reflection of light incident on the circumferential surfaces 134A, 134B is increased and thus increases the ability of the light guides 131A, 131B to propagate light from the respective light entry surface 132A, 132B to the respective light exit surface 133A, 133B, thereby minimising light loss through the circumferential surfaces 134A, 134B.

[0105] The electrical circuit 150 is best seen in FIGS. 4A-5A and is configured for transmitting an image signal generated by the image sensor 111 indicative of the view in the optical direction 112 to the circuit (not shown) of the handle 20 via cables 159 for display on the monitor (which is shown in FIG. 2). The electrical circuit 150 is provided on a flexible circuit board (FPC) and comprises a main circuit portion 151, an imaging circuit portion 155, and two illumination circuit portions 156A, 156B. The imaging circuit portion 155 is in signal communication with the image sensor 111 of the imaging subassembly 110 and is connected to the main circuit portion 151.

[0106] The two illumination circuit portions 156A, 156B are respectively in electrical communication with and supply power to the light sources 120A, 120B and electrically connected to the main circuit portion via a respective bridge circuit portion 157A, 157B of the electrical circuit 150. The bridge circuit portions 157A, 157B are wave-shaped along the optical direction 112 and separated by a slit 158 of the electrical circuit 150.

[0107] The frame component 160 supports and fixes the imaging subassembly 110, the two light sources 120A, 120B, and the electrical circuit 150 relative to each other, as best seen in FIGS. 4A-5A, while FIGS. 7A-7C show the frame component 160 individually.

[0108] The frame component 160 comprises a light shielding wall 170 of an opaque material that comprises an end wall 171 and two side walls 172A, 172B. The end wall 171 extends transversely to the optical direction 112 and between the image sensor 111 and the light sources 120A, 120B so as to shield the image sensor 111 from stray light emitted directly from the light sources 120A, 120B towards the image sensor 111. The two side walls 172A, 172B extend longitudinally and circumferentially relative to the optical direction 112 from the end wall 171. The two side walls 172A, 172B are positioned between the image sensor 111 and the light guides 131A, 131B, thus extending partially around the image sensor 111 and the lens barrel 113 so as to optically shield the imaging subassembly 110 from stray light escaping from the circumferential surfaces 134A, 134B of the light guides 131A, 131B towards the imaging subassembly 110.

[0109] A distal surface of the end wall 171 forms an imaging attachment surface 161 of the frame component 160. The imaging attachment surface 161 has a protrusion 162 (which is best seen in FIGS. 7B-7C). The protrusion 162 defines a well-defined contact point about which the imaging subassembly 110 can be oriented during assembly. Once the imaging subassembly 110, in particular the optical direction 112, has been aligned with respect to the frame component 160, an adhesive is applied in the gap between the imaging circuit portion 155 to the imaging attachment surface 161 surrounding the protrusion 162, thereby adhering and fixing the imaging subassembly 110 to the frame component 160.

[0110] The frame component 160 comprises two illumination attachment surfaces 163A, 163B, one for each light source. A gap between the illumination attachment surfaces 163, 163B and the illumination circuit portions 156A, 156B is filled with a cured adhesive. The gap allows an assembler to adjust the relative longitudinal positioning of the light guide part 130 and a first subassembly having the frame component 160 and the imaging subassembly 110, thus ensuring that the distal surfaces of these parts have the correct position to allow them to simultaneously contact the interior window surface 66 of the window 65.

[0111] The frame component 160 comprises a proximal collar 167 having an outer contour corresponding to and arranged with a gap to an interior surface of the circumferential wall 68 of the tip housing 60. The gap may be filled with a cured adhesive to fix the frame component 160 to the tip housing 60. The frame component 160 further comprises an intermediate collar 169 corresponding to the interior surface of the circumferential wall 68 of the tip housing 60. The light shielding wall 170 is arranged distally relative to the intermediate collar 169, while the proximal collar 167 is arranged proximally relative to the intermediate collar 169.

[0112] As best seen in FIGS. 7A-7C, the frame component 160 comprises an upper supporting surface 164, a lower supporting surface 165 arranged opposite of the upper supporting surface 164, and an intermediate connecting surface 166 connecting the upper supporting surface 164 with the lower supporting surface 165. The upper supporting surface 164, lower supporting surface 165, and intermediate connecting surface 166 are positioned between the proximal collar 167 and the intermediate collar 169. The upper supporting surface 164 and the lower supporting surface 165 may be provided by opposing walls disposed between the proximal collar 167 and the intermediate collar 169.

[0113] As best seen in FIGS. 4A-4B, an upper section 153 of the main circuit portion 151 is adhered to the upper supporting surface 164 of the frame component 160 (best seen in FIGS. 7A-7B) and is connected to the imaging circuit portion 155 via an imaging connecting circuit portion 155′ supported by an imaging connecting surface 161′ of the frame component 160. The imaging connecting surface 161′ extends over and above the light sources 120A, 120B so that the imaging subassembly 110 is arranged distally relative to the light sources 120A, 120B. As best seen in FIG. 5A, the lower supporting surface 165 supports or fixes a lower section 154 of the main circuit portion 150 by adhesion. The intermediate connecting surface 166 supports a bend 152 of the main circuit 150 connecting the upper section 153 of the main circuit portion 150 with the lower section 154 of the main circuit portion 150.

[0114] A plurality of data and electrical cables 159 is soldered to the upper section 153 of the main circuit portion 151 and is configured for transmitting electrical signals between the electrical circuit 150 and a circuit (not shown) of the handle 20 of the endoscope 1. The proximal collar 167 comprise a cut-out 168 configured for accommodating the plurality of cables thus allowing the cables 159 to extend in parallel to the longitudinal axis 52, as best seen in FIGS. 4A and 4B.

[0115] As best seen in FIG. 6A, the tip housing 60 comprises a distal working channel opening 72, a proximal working channel opening 71, and a working channel cavity 73 extending between the distal working channel opening 72 and the proximal working channel opening 71, thereby defining a tip working channel for forming part of the working channel of the endoscope 1. The working channel cavity 73 is separated from the interior cavity of the tip housing by a working channel wall 74. As best seen in FIG. 6B, the working channel cavity 73 has a substantially circular cross-section while a cross-section of the interior cavity 62 has a substantially crescent shape so that the circumference of the exterior housing surface 64 of the tip housing is substantially circular.

[0116] In the following, a method of assembling the above vision assembly 100 is described. The method comprises the steps of: [0117] providing the following separate components or subassemblies: the above imaging subassembly 110, the two light sources 120A, 120B, the light guide part 130, the electrical circuit 150, and the frame component 160. The two light sources 120A, 120B are provided in electrical communication with their respective illumination circuit portions 156A, 156B, and the imaging subassembly 110 is provided with the image sensor 111 being in signal communication with the imaging circuit portion 155.

[0118] Then, a first alignment sequence is performed, as best illustrated in FIGS. 8A and 8B to obtain the first subassembly 115, the first alignment sequence comprises the steps of: [0119] arranging the imaging subassembly 110 and the frame component 160 in a first jig 200A; [0120] aligning the image sensor 111 with the frame component 160 by axially pushing on lens barrel 113 so that the proximal collar 167 of the frame component 160 contacts an axial stop 201A of the first jig 200A (see arrow in FIG. 8B); [0121] aligning the image sensor 111 with the frame component 160 by transversely pushing on the lens barrel 113 and the frame component 160 so that the lens barrel 113 and the frame component 160 contact first transverse stops 202A, 202A′ of the first jig 200A (see transverse arrows in FIG. 8B); and [0122] adhering the imaging subassembly 110 to the frame component 160 by filling a gap between the imaging circuit portion 155 and the imaging attachment surface 161 of the frame component 160 (as best seen in FIG. 6A).

[0123] The imaging subassembly 110 and frame component 160 are now fixed to each other and form the first subassembly 115. A second alignment sequence is then performed, as best illustrated in FIGS. 9A-9D, to obtain the second subassembly 116, the second alignment sequence comprises the steps of: [0124] placing the two light sources 120A, 120B and the light guide part 130 in a second jig 200B, which retains the light sources 120A, 120B in the desired position; [0125] applying an adhesive to the illumination surfaces 121A, 121B of the light sources 120A, 120B; [0126] placing the light entry surfaces 132A, 132B of the light guide part 130 in contact with the adhesive on the illumination surfaces 121A, 121B so that the second jig 200B retains the crossmember 135 of the light guide part 130; [0127] aligning each of the two light sources 120A, 120B with the respective light guide 131A, 131B of the light guide part 130 by pushing the light exit surfaces 133A, 133B of the light guides 131A, 131B so that the illumination circuit portions contact second axial stops 201B of the second jig 200B (see arrows on FIG. 9C); and [0128] adhering the illumination surface 121A, 121B of each of the two light sources 120A, 120B to a light entry surface 132A, 132B of the respective light guide 130A, 130B.

[0129] Thus, the two light sources 120A, 120B and the light guide part 130 form the second subassembly 116. A third alignment sequence is then performed, as best illustrated in FIGS. 10A-10C, to obtain the vision assembly 100, the third alignment sequence comprising the steps of: [0130] arranging the first subassembly 115 and the second subassembly 116 in a third jig 200C; [0131] aligning the first subassembly 115 and the second subassembly 116 by pushing the proximal collar 167 of the frame component 160 so that the light exit surfaces 133A, 133B and the lens barrel 113 contact against third axial stops 201C of the third jig 200C and by transversely pushing the proximal collar 167 so that the proximal collar 167 contracts a third transverse stop 202C of the third jig 200C; and [0132] adhering the second subassembly 116 to the frame component 160 by filling respective gaps between the illumination circuit portions 156A, 156B and the illumination attachment surfaces 163A, 163B, as best seen in FIG. 10B.

[0133] The assembled vision assembly 100 is then inserted into a tip housing part (as previously disclosed) through the proximal opening 163 thereof so that the image sensor 111 views through the window 65 of the tip housing 60, and so that each light guide 131A, 131B of the light guide part 130 is arranged to propagate light received through its light entry surface 132A, 132B, through its light exit surface 133A, 133B and out through the window 65 of the tip housing 60. The proximal opening 63 of the tip housing 60 is then sealed by inserting a sealing element (not shown) and applying an adhesive so that the interior cavity is fluid-sealed, i.e. liquid- and airtight.

[0134] The following items are examples of various embodiments disclosed above:

[0135] Item 1. An endoscope tip part for an endoscope for visually inspecting inaccessible places, such as human body cavities, the endoscope tip part extending along a longitudinal axis from a proximal end thereof to a distal end thereof and comprising: [0136] a tip housing extending circumferentially around and longitudinally along the longitudinal axis and defining an exterior surface of the endoscope tip part, the tip housing at least partially enclosing a fluid-sealed interior cavity, the tip housing including a window having an exterior window surface facing the exterior of the endoscope tip part and an interior window surface facing the interior cavity of the tip housing; and [0137] a vision assembly accommodated in the interior cavity of the tip housing and including: [0138] an imaging subassembly comprising an image sensor viewing in an optical direction, [0139] one or more light sources each light source comprising an illumination surface from which the light source is configured to emit light in an illumination direction, and [0140] a frame component being formed as a separate component, the frame component supporting and fixing the imaging subassembly and the one or more light sources relative to each other,
wherein the frame component comprises a light shielding wall being made of an opaque material and extending between the image sensor and the one or more light sources so as to at least partially shield the image sensor from light emitted from the one or more light sources.

[0141] Item 2. An endoscope tip part according to item 1, wherein the illumination surface of each of the one or more light sources is arranged proximally relative to the image sensor, and the light shielding wall comprises an end wall extending transversely to the optical direction, the end wall extending between the image sensor and the one or more light sources so as to optically shield a proximal side of the image sensor from the one or more light sources.

[0142] Item 3. An endoscope tip part according to any one of the previous items, wherein the vision assembly includes a light guide part comprising at least one light guide, each light guide having a light entry surface and a light exit surface and being configured for receiving light from at least one respective light source of the one or more light sources through its light entry surface and propagating said light through its light exit surface and out through the window of the tip housing.

[0143] Item 4. An endoscope tip part according to item 3, wherein the light shielding wall of the frame component comprises one or more side walls for each light guide extending along the respective light guide and being arranged between the light guide and the imaging subassembly.

[0144] Item 5. An endoscope tip part according to any one of items 3-4, wherein the light guide part is formed, preferably monolithically, as a separate component, and the illumination surface of each of the one or more light sources is attached, preferably adhered, to the light entry surface of its respective light guide.

[0145] Item 6. An endoscope tip part according to any one of the previous items, wherein the vision assembly includes an electrical circuit comprising an imaging circuit portion, the imaging circuit portion being in electrical communication with the image sensor, the electrical circuit being configured for transmitting an image signal generated by the image sensor indicative of the view in the optical direction.

[0146] Item 7. An endoscope tip part according to item 6, wherein the frame component comprises an imaging attachment surface, and wherein the imaging circuit portion is attached, preferably adhered, to the imaging attachment surface.

[0147] Item 8. An endoscope tip part according to any one of items 6-7, wherein the electric circuit comprises a main circuit portion being in electrical communication with the imaging circuit portion, the main circuit portion having a bend arranged around the frame component.

[0148] Item 9. An endoscope tip part according to any one of items 6-8, wherein the electrical circuit comprises one or more illumination circuit portions each being in electrical communication with a respective light source of the one or more light sources, each illumination circuit portion being electrically connected to the main circuit portion by a respective bridge circuit portion of the electrical circuit preferably having a wave-shaped extent along the optical direction.

[0149] Item 10. An endoscope tip part according to item 9, wherein the one or more light sources include at least a first light source and a second light source, and the electrical circuit has a slit separating the bridge circuit portions associated with the first and second light sources.

[0150] Item 11. An endoscope tip part according to any one of previous items, wherein the frame component comprises an illumination attachment surface for each light source, and wherein each light source, preferably via the illumination circuit portion, is attached, preferably adhered, to a respective illumination attachment surface.

[0151] Item 12. An endoscope for visually inspecting inaccessible places, such as human body cavities, comprising: [0152] a handle for gripping by an operator; [0153] an endoscope tip part according to any one of the previous items; [0154] an insertion cord for insertion into a patient, the insertion cord extending from the handle to the endoscope tip part; [0155] one or more cables running through the insertion cord and electrically connecting the endoscope tip part with the handle.

[0156] Item 13. An endoscope system for visually inspecting inaccessible places, such as human body cavities, the endoscope system comprising a monitor and an endoscope according to item 12 or an endoscope comprising an endoscope tip part according to any one of items 1-11, wherein the endoscope is connectable to the monitor, and the monitor is configured for displaying an image captured by the image sensor of the endoscope tip part.

[0157] Item 14. A method for assembling a vision assembly for an endoscope tip part, preferably according to any one of items 1-11, the endoscope tip part extending along a longitudinal axis from a proximal end thereof to a distal end thereof, the method comprising the steps of: [0158] providing: [0159] an imaging subassembly comprising an image sensor viewing in an optical direction; [0160] one or more light sources, such as a light-emitting diode or an optical fibre, each light source comprising an illumination surface from which the light source is configured to emit light in an illumination direction; [0161] a light guide part comprising at least one light guide, each light guide having a light entry surface and a light exit surface and being configured for receiving light from at least one respective light source of the one or more light sources through its light entry surface and propagating said light out through its light exit surface; and [0162] a frame component being formed as a separate component; and [0163] performing a first alignment sequence to obtain a first subassembly, the first alignment sequence comprises the steps of: [0164] aligning the image sensor with the frame component by axially pushing against an axial stop and by transversely pushing against a transverse stop; and [0165] fixing the imaging subassembly to the frame component; and [0166] performing a second alignment sequence to obtain a second subassembly, the second alignment sequence comprising the steps of: [0167] aligning each at least one light source of the one or more light sources with the respective light guide of the light guide part by pushing against an axial stop; and [0168] fixing each at least one light source of the one or more light sources to the light entry surface of the respective light guide; and [0169] performing a third alignment sequence to obtain the vision assembly, the third alignment sequence comprising the steps of: [0170] aligning the first subassembly and the second subassembly; and [0171] fixing the second subassembly to the frame component.

[0172] Item 15. A method according to item 14 for assembling the tip part for a medical device or preferably an endoscope for visually inspecting inaccessible places, such as human body cavities, the method further comprising the steps of: [0173] providing a tip housing extending circumferentially around and longitudinally along the longitudinal axis and defining an exterior surface of the endoscope tip part, the tip housing at least partially enclosing an interior cavity and having a proximal opening at the proximal end of the endoscope tip part providing access to the interior cavity, the tip housing including a window having an exterior window surface facing the exterior of the endoscope tip part and an interior window surface facing the interior cavity of the tip housing; and [0174] inserting the vision assembly through the proximal opening of the tip housing so that the image sensor views through the window of the tip housing, and so that each light guide of the light guide part is arranged to propagate light received through its light entry surface through its light exit surface and out through the window of the tip housing; and [0175] sealing the proximal opening of the tip housing so that the interior cavity is fluid-sealed.

TABLE-US-00001 Reference numerals:  1 endoscope  11 monitor  12 cable socket  13 monitor cable  20 handle  21 control lever  22 handle housing  30 insertion cord  40 bending section  41 proximal end  42 sleeve  43 segment  44 hinge  50 tip part  51 exterior surface  52 longitudinal axis  60 tip housing  62 interior cavity  63 proximal opening  64 exterior housing surface  65 window  66 interior window surface  67 exterior window surface  68 circumferential wall  71 proximal tip working channel opening  72 distal tip working channel opening  73 working channel cavity  74 working channel wall 100 vision assembly 110 imaging subassembly 111 image sensor 112 optical direction 113 lens barrel 120 light source 121 illumination surface 122 illumination direction 130 light guide part 131 light guide 132 light entry surface 133 light exit surface 134 circumferential surface 135 crossmember 150 electrical circuit 151 main circuit portion 152 bend 153 upper section 154 lower section 155 imaging circuit portion  155′ imaging connecting circuit portion 156 illumination circuit portion 157 bridge circuit portion 158 slit 159 cable 160 frame component 161 imaging attachment surface  161′ imaging connecting surface 162 protrusion 163 illumination attachment surface 164 upper supporting surface 165 lower supporting surface 166 intermediate connecting surface 167 proximal collar 168 cable cut-out 169 intermediate collar 170 light shielding wall 171 end wall 172 side wall 200 jig 201 axial stop 202 traverse stop