AN ARTICULATED BENDING SECTION BODY FOR AN INSERTION ENDOSCOPE

Abstract

An endoscope with an articulated bending section body (1) including a number of segments (4) where at least one hinge member (5) is provided between any adjacent segment (4). Each segment (4) has a first surface (9, 9″) and a second surface (10, 10′) delimited by an outer rim. The first surface (9, 9″) includes a first abutment part (11) adapted to abut the first opposing surface (10, 11) of an adjacent segment, wherein the first abutment part (11) is at a distance from the at least one hinge member (5) that is shorter than the shortest distance from the at least one hinge member (5) to the most remote part of the rim.

Claims

1-8. (canceled)

9. An endoscope comprising: an articulated bending section body including segments interconnected by hinge members on a first bending plane, the segments including a proximal segment, a distal segment and intermediate segments arranged between the proximal segment and the distal segment, wherein each intermediate segment comprises an outer rim, a distal surface and a proximal surface, the distal surface of one intermediate segment facing the proximal surface of another segment positioned adjacent to the one segment, the proximal surface and the distal surface each extending from the outer rim of the respective intermediate segment to a hinge member of the hinge members, wherein the distal surface of the one intermediate segment comprises a distal abutment portion and the proximal surface of the another intermediate segment comprises a proximal abutment portion, and wherein the distal abutment portion of the one intermediate segment and the proximal abutment portion of the another intermediate segment are configured to abut each other at a location intermediate the outer rims and the hinge member to maintain apart the outer rim of the one intermediate segment from the outer rim of the another intermediate segment.

10. The endoscope of claim 9, wherein when the distal abutment portion of the one intermediate segment and the proximal abutment portion of the another intermediate segment abut each other the articulated bending section body is bent at a maximum angle of the first bending plane.

11. The endoscope of claim 10, wherein the distal abutment portion extends distally across a plane passing through the outer rim of the respective intermediate segment and the hinge member.

12. The endoscope of claim 9, further comprising a sheath positioned over the articulated bending section body, wherein when the articulated bending section body is bent at the maximum angle of the first bending plane a gap is formed between the outer rim of the one intermediate segment and the outer rim of the another intermediate segment, and wherein the sheath extends into the gap no further than the location where the distal abutment portion of the one intermediate segment and the proximal abutment portion of the another intermediate segment abut.

13. The endoscope of claim 12, further comprising a pull-wire, wherein each intermediate segment comprises a pull-wire passage extending between a pull-wire opening in the distal surface and a pull-wire opening in the proximal surface, wherein the pull-wire traverses the pull-wire passage, and wherein the sheath extends into the gap no further than the pull-wire.

14. The endoscope of claim 12, wherein the segments interconnected by the hinge members on the first bending plane comprise a passive section of the articulated bending section body, the articulated bending section body further comprising an active section, the active section comprising intermediate segments interconnected by hinge members on the first bending plane and hinge members on a second bending plane.

15. The endoscope of claim 14, wherein each intermediate segment in the active section comprises a pull-wire passage extending through a hinge member of the hinge members on the second bending plane.

16. The endoscope of claim 14, wherein the intermediate segments in the active section comprise pairs of intermediate segments, each pair connected to another pair by the hinge members on the first bending plane, and each intermediate segment of the pair connected to the other by the hinge members on the second bending plane, wherein each intermediate segment in the active section comprises an outer rim, a distal surface and a proximal surface, the distal surface of one intermediate segment facing the proximal surface of another segment positioned adjacent to the one segment, the proximal surface and the distal surface each extending from the outer rim of the respective intermediate segment to a hinge member of the hinge members, wherein the distal surface of the one intermediate segment comprises a distal abutment portion and the proximal surface of the another intermediate segment comprises a proximal abutment portion, and wherein the distal abutment portion of the one intermediate segment and the proximal abutment portion of the another intermediate segment are configured to abut each other at a location intermediate the outer rims and the hinge member.

17. The endoscope of claim 9, wherein each intermediate segment comprises a pull-wire passage extending between a pull-wire opening in the distal surface and a pull-wire opening in the proximal surface, and wherein the pull-wire opening in the distal surface is located in the abutment portion.

18. The endoscope of claim 9, wherein each intermediate segment comprises a pull-wire passage extending between a pull-wire opening in the distal surface and a pull-wire opening in the proximal surface, and wherein the distal abutment portion comprises a rounded edge located radially outwardly from the pull-wire opening in the distal surface.

19. The endoscope of claim 9, wherein each intermediate segment comprises a pull-wire passage extending between a pull-wire opening in the distal surface and a pull-wire opening in the proximal surface, wherein the distal abutment portion comprises a rounded edge, and wherein the rounded edge is at least partially intersected by the pull-wire opening in the distal surface.

20. The endoscope of claim 9, wherein the distal abutment portion and the proximal abutment portion comprise plane surfaces.

21. The endoscope of claim 20, wherein the articulated bending section body is bent at a maximum angle when the plane surfaces abut each other.

22. The endoscope of claim 20, wherein the pull-wire opening in the distal surface and the pull-wire opening in the proximal surface are located in the plane surfaces.

23. A system comprising the endoscope of claim 9 and a display unit connectable to said endoscope.

24. The system of claim 23, wherein when the distal abutment portion of the one intermediate segment and the proximal abutment portion of the another intermediate segment abut each other the articulated bending section body is bent at a maximum angle of the first bending plane.

25. The system of claim 24, further comprising a sheath positioned over the articulated bending section body, wherein when the articulated bending section body is bent at the maximum angle of the first bending plane a gap is formed between the outer rim of the one intermediate segment and the outer rim of the another intermediate segment, and wherein the sheath extends into the gap no further than the location where the distal abutment portion of the one intermediate segment and the proximal abutment portion of the another intermediate segment abut.

26. The system of claim 25, wherein the segments interconnected by the hinge members on the first bending plane comprise a passive section of the articulated bending section body, the articulated bending section body further comprising an active section, the active section comprising intermediate segments interconnected by hinge members on the first bending plane and hinge members on a second bending plane.

27. The system of claim 26, wherein each intermediate segment in the active section comprises a pull-wire passage extending through a hinge member of the hinge members on the second bending plane.

28. The system of claim 26, wherein the intermediate segments in the active section comprise pairs of intermediate segments, each pair connected to another pair by the hinge members on the first bending plane, and each intermediate segment of the pair connected to the other by the hinge members on the second bending plane, wherein each intermediate segment in the active section comprises an outer rim, a distal surface and a proximal surface, the distal surface of one intermediate segment facing the proximal surface of another segment positioned adjacent to the one segment, the proximal surface and the distal surface each extending from the outer rim of the respective intermediate segment to a hinge member of the hinge members, wherein the distal surface of the one intermediate segment comprises a distal abutment portion and the proximal surface of the another intermediate segment comprises a proximal abutment portion, and wherein the distal abutment portion of the one intermediate segment and the proximal abutment portion of the another intermediate segment are configured to abut each other at a location intermediate the outer rims and the hinge member.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0020] The disclosure will now be made in greater detail based on non-limiting exemplary embodiments and the appended drawings on which:

[0021] FIG. 1 shows an isometric view of a first embodiment of a bending section body according to the present disclosure in a relaxed, as made, condition,

[0022] FIG. 2 shows a partial top view of an intermediate segment and two adjacent segments of the first embodiment of FIG. 1,

[0023] FIG. 3 shows a cross-sectional view of the first embodiment taken along the line III-III in FIG. 1,

[0024] FIG. 4 schematically shows a part of a bending section body according to the disclosure in a maximally bent state,

[0025] FIG. 5 shows an isometric view of a second embodiment of a bending section body according to the present disclosure in a relaxed, as made, condition,

[0026] FIG. 6 shows a partial top view of four intermediate segments of the first embodiment of FIG. 5,

[0027] FIG. 7 shows a cross-sectional view of the second embodiment taken along the line VII-VII in FIG. 5,

[0028] FIG. 8 shows an isometric view of a third embodiment of a bending section body according to the present disclosure in a relaxed, as made, condition,

[0029] FIG. 9 shows a partial top view of four intermediate segments of the third embodiment of FIG. 8,

[0030] FIG. 10 shows a cross-sectional view of the first embodiment taken along the line X-X in FIG. 8, and

[0031] FIG. 11 shows a system comprising an endoscope according to the present disclosure and a display device.

DETAILED DESCRIPTION

[0032] Turning first to FIG. 11 a system comprising a display device 100 and an endoscope 50 connectable to the display device 100 by means of a cable 101 or a wireless connection is shown. The endoscope 50 comprises a handle 51 at the proximal end and an insertion tube 52 connected to a bending section 53 forming part of the distal end of the endoscope 50. The bending section 53 comprises an articulated bending section body 1. The bending section body 1 is not visible in FIG. 11 because it is covered by a thin external sheath 13. Reference is therefore now made to FIGS. 1 to 10.

[0033] In FIG. 1 an articulated bending section body 1 according to a first embodiment of the disclosure is shown. The articulated bending section body comprises 1 a proximal end segment 2 at one end adapted to be connected to an insertion tube body (not show). At the other end the articulated bending section body 1 comprises a distal end segment 3 for at least partly accommodating illumination devices, an electronic vision device, such as a camera, and other electronics. Between the proximal end segment 2 and the distal end segment 3 a number of intermediate segments 4 are located. Each of the intermediate segments 4 is connected to a neighboring segment, be it to another intermediate segment 4 to the proximal end segment 2 or the distal end segment 3 by means of hinge members 5, such as foil hinges. The intermediate segments 4 are preferably more or less identical, except for inlets 6, ejector marks etc. from manufacture. In some cases, as will be discussed below, some of the intermediate segment 4 may be mirror images of other intermediate segments 4 but otherwise identical. Accordingly, as can best be seen in FIG. 2, the hinge members 5 of the first embodiment all lie in the same plane S-S. The outer surface 7 of each hinge member 5 is preferably circular so as to define a cylindrical mantle surface delimited by a rim 8 and give the bending section body 1 an overall cylindrical shape in the relaxed, as made, state. That is to say as manufactured and without any external bending forces acting upon it. The plane S-S in which the hinge members 4 lie thus defines a longitudinal mirror symmetry plane of the bending section body 1.

[0034] The outer rim 8 defines a transition between the outer surface 7 and respective opposing surfaces 9, 10 of adjacent segments 4. Since the segments 4 are essentially identical, primes will be used in the following to distinguish one segment 4 from the adjacent neighboring segments 4′ and 4″, although the features described are equally applicable to them. That is to say, the intermediate segment 4 shown in FIG. 2 comprises a first surface 9 and a second surface 10, where the first surface 9 faces an opposing surface 10′, of an adjacent segment 4′ and the second surface 10 faces an opposing surface 9″ of an adjacent segment 4″.

[0035] Raised above the opposing surfaces 9, 10 are a number of abutment parts 11, 11′, 11″. When the bending section bends opposing pairs of abutment parts 11, 11′; 11, 11″ will abut and prevent the bending section from bending any further. The abutment as such is common to all embodiments, and will, as can be seen from FIG. 4, provide a spacing between the outermost edges 12, 12′; 12, 12″ of adjacent outer rims 8 of neighboring segments 4 thereby forming a gap 14 preventing pinching of the outer sheath 13. Instead, the outer sheath will fold smoothly into the gaps 14 formed. The abutment however may differ. As will be understood from the geometry of the embodiment of FIGS. 1 to 3 only the outermost edges 15, 15′ abut, whereas in the embodiment of FIG. 4 the abutment parts have inclined surfaces allowing a larger surface area of the opposing abutment parts 11, 11′ to abut. Please note that apart from the primes the same reference numerals are used for corresponding items in different embodiments throughout this description.

[0036] As can be seen, in the embodiment in FIG. 2, the pull-wire openings 16 of the through pull-wire passages are at least partially but preferably in full located closer to the hinge members 5 than the outermost edges of the abutment parts of adjacent segments 4, 4′, i.e. located between the hinge members and the outermost edges of the abutment parts. Thus, when the outermost edges 15, 15′ of the abutment parts abut, the gap 14 will be inwardly closed and further prevent the pull-wires 17 from engaging the fold of the outer sheath 13. Although the present explanation makes reference to plural pull-wires, the skilled person will understand that features relating to pull-wires may all be applicable to a single pull-wire and not only several, such as typically two or four.

[0037] Turning now to FIGS. 5 to 7 a different embodiment of a bending section body 1 according to the disclosure is shown. The bending section body 1 in this embodiment differs from the embodiments of FIGS. 1 to 4, which may bend in one plane only, in that it may bend in two planes. It furthermore differs in that it comprises an active bending section 1d on the distal side of an interface segment 4i in FIG. 5 and a passive bending section 1 p on the proximal side of the interface segment 4i. In the passive bending section 1p the pull-wires 1 are guided in sheaths according to the Bowden principle, the sheaths being terminated in the interface segment 4i with only the pull-wires 17 extending into the active bending section 1d.

[0038] As can be seen from FIG. 6 the intermediate segments 4 of the active bending section are arranged in mirror image pairs of otherwise identical intermediate segments. That is to say all of the intermediate segments 4 illustrated in FIG. 6 are identical if looked at individually but have a high degree rotational symmetry so that by a rotation of 90 degrees each intermediate segment will look like its own mirror image, except for details not relevant for the disclosure such as e.g. moulding inlets 6 and the like. Like in the previous embodiments, the opposing pairs of first and second surfaces 9, 10 have a number of abutment parts 11. When the bending section bends opposing pairs of abutment parts 11, 11′ will abut and prevent the bending section from bending any further. Because of the overall symmetry this applies equally to both of the bending planes i.e. bending plane in which the hinges members 5 lie as well as the bending plane in which the hinges members 5′ lie. As can further be seen in FIG. 6 there are essentially four hinge members 5, 5′ between each pair of intermediate segments 4, because each of the hinge members symmetrically arranged at either side is de facto split in two by a gap 18 coinciding with the pull-wire openings 16, so as to allow the pull-wires 17 (not shown in FIG. 6) to pass between two intermediate segments 4, in other words the pull-wire passages continue through the hinge members from one intermediate segment to the next.

[0039] Turning to the end view of an intermediate segment 4 in FIG. 7 the details of the abutment parts 11 raised above the surface 9 can be seen. Comparison with FIG. 2 will reveal that the outermost edge 15 of the abutment part reaches all the way to the outer rim 12 at a location closer to the hinges, whereas in the embodiment of FIG. 2 it is located more centrally on the surface 9. Moreover, whereas the outermost edge is generally straight in the embodiment of FIG. 2 it describes a curve in the embodiment of FIG. 7. The curve is preferably a circle sector of a large radius than the radius of the overall intermediate segment 4. The pull-wire openings coincide more or less with the rounded outermost edge 15 of the abutment part 11. This still prevents the outer sheath 13 to get into contact with the abrasive pull-wire 17 when the bending section body 1 bends under the tension of the pull-wire 17.

[0040] Similarly, to the embodiment of the bending section body of FIGS. 5 to 7, the bending section body 1 of FIGS. 8 to 10 is devised to bend in two planes. It lacks, however, the division in a passive and an active bending section part. Accordingly, it consists entirely of identical intermediate segments 4 between the proximal end segment 2 and the distal end segment 3. Also in this embodiment the rotational symmetry is such that turning an intermediate segment 4 by 90 degrees makes it correspond to its own mirror image. To allow bending in two planes defined by hinges 5, 5′ bending section body 1 comprises pairs of intermediate segments 4 that are mirror images of each other, as is also the case in the embodiment of FIGS. 5 to 7.

[0041] Please note that as compared to FIGS. 5 to 7 the outer sheath 13 and the pull-wires 17 have been omitted in FIGS. 8 to 10 for illustration purposes, but would essentially correspond to FIGS. 5 to 7. Accordingly, when tensioning a pull-wire 17 the bending section body 1 will bend, the bending direction depending on which of the four pull-wires 17 are tensioned. When bending, opposing abutment parts 11, 11′ will abut at the outer edges 15, 15 thereby blocking the outer rims 12, 12′ of the intermediate segments from fully approaching each other, so that the gap 14 is formed. As in the other embodiments the gap 14 will accommodate a fold of the outer sheath 13 in a manner preventing it from being pinched by the outer rims. Instead it will be held as a loose fold that may follow movements of the pull-wire 17, preferably with geometrical bond, i.e. follow without rubbing, so as to avoid any abrasion that could ruin the outer sheath 13. Preferably, the outer edge 15 in this and the other embodiments disclose is also rounded so as to not provide any sharp edges that might still pinch the fold in the outer sheath 13.

[0042] As will be clear from FIG. 10 the outer edge 15 of the abutment part describes a curve, preferably, a circle sector, albeit with a narrower radius that the overall radius of the intermediate segments 4. Apart from having a curvature, the outer edge 15 is preferably also rounded to further prevent pinching of the outer sheath 13. In this and other embodiments it has been found that if the pull-wire opening 16 intersects with the rounded outer edge 15 it suffices to protect the outer sheath 13 from abrasion it need not be located in a fully retracted position away from the rounded edge and closer to the plane of the hinge members.

[0043] As can be seen by comparison between e.g. FIGS. 3, 7 and 10. The outer edge 15 is in all embodiments closer to the plane defined by the hinges 5, than the distance from the hinges to the most remote part of the outer rim 12 as seen from the hinges, i.e. the most remote point on the outer rim 12 as seen from the hinges, so as to allow the outer edges 15 to abut and form the gap 14 between the remote parts outer rims 12 that could otherwise pinch the outer sheath 13.

[0044] Although all shown embodiments have mirror image symmetry, with raised abutment parts 11 butting corresponding or identical abutment parts 11 on adjacent segments, such as another intermediate segment 4, a proximal end segment 2, a distal end segment 3 or even an interface segment 4i this is not a prerequisite for the functionality of the bending section body. A raised abutment part on one intermediate segment could also just abut directly on a plane opposing surface 9, 10 and still form a sufficient gap 14 by blocking the outer rims 12, 12′ of adjacent segments.