EP4366596A1

EP4366596A1 - Endoscope with a glued pull cable

Info

Publication number: EP4366596A1
Application number: EP22773030.6A
Authority: EP
Inventors: Anh Minh Do; Tilman Schröter; Eckhardt Brost
Original assignee: Hoya Corp
Current assignee: Hoya Corp
Priority date: 2021-08-31
Filing date: 2022-08-31
Publication date: 2024-05-15
Also published as: CN117794438A; DE102021122445A1; JP2024527918A; JP7624117B2; WO2023031814A1

Abstract

The present disclosure relates to an endoscope having a proximal endoscope housing (10) and a pull cable actuating device (16) arranged in the proximal endoscope housing (10), to which a pull cable (60) is anchored, which extends in the endoscope to the distal side of the endoscope so that a pull cable movement on the distal side of the endoscope can be used.The pull cable actuating device (16) comprises an assembly of a pull cable anchoring element(30) and a Bowden cable anchoring element (20). A Bowden cable (50), extending to the distal side of the endoscope and through which the pull cable (60) is routed, is anchored to the Bowden cable anchoring element (20). The pull cable (60) is glued at the pull cable anchoring element (30).

Description

Endoscope with a glued pull cable

FIELD OF THE DISCLOSURE

The present disclosure relates to an endoscope having a pull cable actuating device.

More precisely, the present disclosure relates to an endoscope with a proximal endoscope housing; and a pull cable actuating device arranged in the proximal endoscope housing, to which a pull cable is anchored, which extends in the endoscope to the distal side of the endoscope so that a pull cable movement can be used on the distal side of the endoscope.

BACKGROUND

This cable is constructed in a similar way to a Bowden cable, wherein a pull wire (the actual pull cable) is surrounded by a flexible sleeve that is nevertheless relatively pressure-resistant in the pulling direction. The sleeve serves to guide a pulling movement of the pull wire and as a counter-bearing to support (brace) the pulling forces (tensile forces) to be transmitted. The Bowden cable is thus able to transmit pulling forces in the endoscope even along a curved path well.

At the distal and proximal ends the sleeve is supported and the pull wire protrudes from the end of the sleeve.

In one design, the end of the pull wire protruding from the proximal end of the sleeve is soldered to a metal nipple at the proximal end. The metal nipple is inserted in a nipple groove of an angulation wheel. The proximal end of the sleeve is clamped in a sleeve groove portion at a distance from (spaced apart from) the nipple groove. By turning the angulation wheel, the end of the pull wire anchored to the angulation wheel is displaced relative to the sleeve and thus tensioned or relieved.

This design uses a large number of individual parts and a large number of successive assembling steps. Consequently, this design entails corresponding costs.

SUMMARY OF THE DISCLOSURE An aim of the present disclosure is to find a cost-effective solution for the proximal anchoring of the pull cable. In particular, it is an object of the present disclosure to find an endoscope with advantageous proximal anchoring of the pull cable.

This object is achieved by means of an endoscope according to claim i. Examples thereof are detailed in the dependent claims.

The present disclosure is directed to an endoscope. The endoscope includes a proximal endoscope housing; and a pull cable actuating device arranged in the proximal endoscope housing. A pull cable is anchored to the pull cable actuating device, wherein the pull cable extends in the endoscope to the distal side of the endoscope so that a pull cable movement can be used (becomes usable) on the distal side of the endoscope. The pull cable actuating device includes an assembly of a pull cable anchoring element and a Bowden cable anchoring element. Anchored to the Bowden cable anchoring element is a Bowden cable that extends to the distal side of the endoscope and through which the pull cable is routed (guided). The pull cable is glued at the pull cable anchoring element.

With this endoscope, the pull cable can be glued at the pull cable anchoring element. The elaborate and costly operation of attaching and anchoring a metal nipple to the end of the pull cable is no longer necessary. Since the gluing spot can take up a very small space in the pull cable bonding/ gluing, the installation space for the pull cable anchoring also becomes smaller than if a metal nipple is to be installed at the end of the pull cable. By gluing the pull cable, even a low-cost mass production is possible. The costs of manufacturing the endoscope are reduced.

The Bowden cable anchoring element can have (include) a groove, with a proximal end portion of the Bowden cable being anchored immovably (non-movable) relative to the Bowden cable anchoring element along the groove.

The proximal end portion of the Bowden cable is anchored in a simple manner by placing it in the groove. This solution supports a cost-effective mass production. The technical effort for anchoring the Bowden cable is low while at the same time providing a high level of reliability.

The proximal end portion of the Bowden cable can be glued in the Bowden cable anchoring element. As an alternative or in addition to the gluing, the proximal end portion of the Bowden cable can be clamped in the Bowden cable anchoring element or held in a form-fitting manner. The pull cable anchoring element can be rotatably mounted in the endoscope housing, wherein the Bowden cable anchoring element is not rotatably mounted (non-rotatably mounted) in the endoscope housing distally from the pull cable anchoring element. This allows the pull cable to be tensioned/ relieved by rotating the pull cable anchoring element relative to the Bowden cable anchoring element.

The assembly including the pull cable anchoring element and the Bowden cable anchoring element can be made of plastic and can be removable from the endoscope housing. This makes it cost-effective to provide the assembly of the pull cable anchoring element and the Bowden cable anchoring element. Any suitable forms of the assembly of the pull cable anchoring element and the Bowden cable anchoring element can be selected, including more complex ones. The assembling of the assembly including the pull cable anchoring element and the Bowden cable anchoring element to the endoscope housing is simple.

The pull cable anchoring element can include a lever element that is configured to be inserted from the outside of the endoscope housing, wherein the pull cable anchoring element is configured to be rotated relative to the endoscope housing and relative to the Bowden cable anchoring element by actuating the lever element. The actuation for rotating the pull cable anchoring element relative to the Bowden cable anchoring element is thus simple and easy for the user to understand. The assembling of the assembly of the pull cable anchoring element and the Bowden cable anchoring element with the lever element is also simple. The lever element can be configured to snap into place (snap in) in the pull cable anchoring element. Here, the lever element can snap into place in the pull cable anchoring element in such a way that the user can no longer separate the lever element from the pull cable anchoring element once it is snapped into place without destroying the endoscope housing. Such an endoscope is safe against misuse.

On the other hand, a design can be chosen in which the lever element snaps into place in the pull cable anchoring element in a removable manner. This ensures versatility in parts selection and a possibility of simple repair.

Two Bowden cables extending to the distal side of the endoscope can be anchored in the Bowden cable anchoring element, through each of which a pull cable is routed which is anchored to a gluing spot in the pull cable anchoring element. One end of one pull cable is routed to the distal side in the one Bowden cable, and one end of the other pull cable is routed to the distal side in the other Bowden cable. The opposite other, i.e. proximal, ends of the two pull cables are then anchored in the pull cable anchoring element. The proximal ends of the two pull cables can be mechanically connected before gluing, e.g. by splicing, fusing, knotting etc. Alternatively, the proximal ends of the two pull cables can be merely glued without being mechanically connected.

As an alternative, two Bowden cables extending to the distal side of the endoscope can be anchored in the Bowden cable anchoring element, through which a single pull cable is routed, the proximal reversal point of which is anchored to a gluing spot in the pull cable anchoring element. One end of the single pull cable is routed to the distal side in one Bowden cable and the other end of the single pull cable is routed to the distal side in the other Bowden cable.

The pull cable can be glued at the pull cable anchoring element at at least two gluing spots that are spaced apart from each other. This means that the pull cable is held even more securely on the pull cable anchoring element. A secure hold of the pull cable is ensured even if the pull cable is only glued at the pull cable anchoring element without being mechanically anchored.

The two gluing spots can include a proximal end gluing spot as a primary gluing spot, and a secondary gluing spot positioned distally from the end gluing spot, wherein the pull cable is glued at the secondary gluing spot on the pull cable anchoring element coming from the distal side and is glued at the end gluing spot on the pull cable anchoring element further along in the proximal direction.

At the secondary gluing spot, an adhesive wiping wall (glue wiping wall) can be formed on the pull cable anchoring element. The adhesive (glue) can be easily applied and wiped off at the adhesive wiping wall. After the adhesive has been wiped off, the adhesive is already at the desired gluing position. Gluing the pull cable thus becomes even simpler and more cost-effective.

At the secondary gluing spot, a further wall can be formed on the pull cable anchoring element that opposes (is opposite) the adhesive wiping wall, and, at the secondary gluing spot, an adhesive deposition region (glue deposition region) can be formed on the pull cable anchoring element between the adhesive wiping wall and the other, opposing wall, wherein the pull cable is glued at the pull cable anchoring element in the adhesive deposition region. The pull cable passes through the adhesive deposition region at the secondary gluing spot. The adhesive wiping wall and the other wall opposing the adhesive wiping wall can form a kind of well or trough at the adhesive deposition region, which can hold a predefined amount of adhesive (glue) at the adhesive deposition region. This facilitates the dosing of the adhesive. Gluing the pull cable thus becomes even simpler and more cost-effective. Adjacent to the end gluing spot, a protrusion rising from the pull cable anchoring element can be provided on the pull cable anchoring element, wherein the pull cable glued at the end gluing spot is wound around the protrusion. If the pull cable is wound around the protrusion near the end gluing spot, pulling/ tensile forces applied to the pull cable can be absorbed by the protrusion. The pull cable is thus held even more securely at the end gluing spot. In some cases, tensile forces generated on the pull cable during the curing of the adhesive can even be tolerated.

Adjacent to the end gluing spot, two protrusions rising from the pull cable anchoring element can be provided on the pull cable anchoring element, around both of which the pull cable glued at the end gluing spot is wound, with the end gluing spot being arranged between the protrusions. The bonding becomes even simpler and more secure.

The aspects of the present disclosure explained above can be appropriately combined.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. i shows a schematic perspective view of a control body housing of an endoscope with a pull cable actuating device in an example.

Fig. 2 shows a schematic perspective view of a proximal portion of the control body housing of Figure 1.

Fig. 3 shows a schematic perspective view of the control body housing without a pull cable actuating device.

Fig. 4 shows a schematic perspective view of a proximal portion of the control body housing of Figure 3.

Fig. 5 shows a schematic perspective view of the pull cable actuating device from above.

Fig. 6 shows a schematic perspective view from below of a pull cable anchoring element of the pull cable actuating device.

Fig. 7 shows a schematic perspective plan view of a section of the pull cable anchoring element, showing a primary gluing spot. Fig. 8 shows a further schematic perspective plan view of a section of the pull cable anchoring element.

Fig. 9 shows a further schematic perspective plan view of a section of the pull cable anchoring element, showing a secondary gluing spot.

Fig. io shows a schematic perspective plan view of the pull cable anchoring element.

Fig. n shows a schematic perspective plan view of a detail of the pull cable anchoring element.

Fig. 12 shows a schematic perspective view of the pull cable actuating device from below.

Fig. 13 shows a schematic perspective plan view of a Bowden cable anchoring element of the pull cable actuating device.

Fig. 14 shows a further schematic perspective plan view of the Bowden cable anchoring element.

Fig. 15 shows a schematic perspective view from below of the Bowden cable anchoring element.

Fig. 16 shows a schematic perspective plan view of a lever element of the pull cable actuating device.

Fig. 17 shows a schematic perspective side view of the lever element.

DESCRIPTION OF EXAMPLES

The present disclosure is described in detail below, with reference to the drawings and based on examples. The illustrations in the drawings are not necessarily shown to scale, but are sometimes shown distorted for better clarity.

In the following, an example of the present disclosure is described with reference to Figures i to 17.

Structure

Fig. 1 shows a schematic perspective plan view of a control body housing 10 of an endoscope 1 with a pull cable actuating device 16. The control body housing 10 forms a proximal endoscope housing of the present disclosure.

The control body housing 10 is held in the hand by the user and therefore has a suitable ergonomic design. On the distal side of the control body housing 10, an insertion tube 11 extends in the distal direction. The insertion tube 11 is inserted into a patient to be examined or into an object to be examined. On the distal side, the insertion tube 11 has an endoscope head (not shown). The insertion tube 11 is flexible.

More precisely, Fig. 1 shows half of the control body housing 10. The other half (that is not shown) of the control body housing 10 is placed on the half of the control body housing 10 shown in Fig. 1 to complete the control body housing 10.

The control body housing 10 therefore has a plurality of fastening connectors 12 at various suitable positions to enable a connection to the other half of the control body housing 10 by means of suitable fastening means, such as screws, in a known manner.

Furthermore, a suction channel 14 with a proximal suction connector 13 and an instrument inlet portion 15 as the proximal access of a working channel are arranged in the control body housing 10. Both the suction channel 14 and the working channel lead in the distal direction to the endoscope head.

In the control body housing 10, a pull cable actuating device 16 according to the present disclosure is mounted. The pull cable actuating device 16 is built in such a way that it effects the tensioning/relieving of a pull cable 6o.

The pull cable 6o extends from the pull cable actuating device 16, arranged in the endoscope on the proximal side, to the distal side of the endoscope.

The pull cable actuating device 16 is formed as an assembly and includes a Bowden cable anchoring element 20 and a pull cable anchoring element 30. A lever element 40 is inserted at the pull cable anchoring element 30 for rotating the pull cable anchoring element 30. The Bowden cable anchoring element 20, the pull cable anchoring element 30, and the lever element 40 are made of plastic. Other suitable materials can be used.

Figures 1 and 2 show the control body housing 10 with the pull cable actuating device 16. Figures 3 and 4 show the control body housing 10 without the pull cable actuating device 16.

Figures 5 and 12 show the pull cable actuating device 16 as a fully assembled assembly with the lever element 40.

Two Bowden cables 50 (50a, 50b) are anchored in the Bowden cable anchoring element 20. Each Bowden cable 50 guides a pull cable 60. This means that two pull cables 60 (60a, 60b) are anchored in the pull cable anchoring element 30. The Bowden cable anchoring element 20 is inserted immovably in the control body housing 10.

The pull cable anchoring element 30 is rotatably arranged in the control body housing 10. By means of the lever element 40, the pull cable anchoring element 30 is rotatable relative to both the control body housing 10 and to the Bowden cable anchoring element 20. The lever element 40 can be actuated from the outside of the control body housing 10. Turning the pull cable anchoring element 30 tensions one pull cable 60a and relieves the other pull cable 60b, see Figure 5. This means that the pull cable 60a can be pulled out of the Bowden cable 50a, for example, to cause a pivoting movement in one direction at the endoscope head. In addition, the pull cable 60b can be pulled out of the Bowden cable 50b, for example, to cause a pivoting movement in the other direction at the endoscope head. The pull cable 60a and the pull cable 60b are operatively connected at the proximal end and at the distal end. Thus, if the pull cable 60a is pulled out of the Bowden cable 50a in the proximal direction, the pull cable 60b is pulled into the Bowden cable 50b in the distal direction. Correspondingly, if the pull cable 60b is pulled out of the Bowden cable 50b in the proximal direction, the pull cable 60a is pulled into the Bowden cable 50a in the distal direction. The pull cable actuating device 16 is described in detail below.

Figures 6 to n show the pull cable anchoring element 30.

The pull cable anchoring element 30 is rotatably mounted in the control body housing 10. The pull cable anchoring element 30 is configured to be rotated by the user from outside the endoscope 1 by turning a lever such as the lever element 40 described below. The pull cable 60 is anchored in the pull cable anchoring element 30. Thus, by turning the pull cable anchoring element 30, the pull cable 60 is tensioned or relieved.

An example of the pull cable anchoring element 30 is described in detail in the following.

As shown in Figures 1 and 2, the pull cable anchoring element 30 has a distal side pointing in the distal direction of the endoscope 1, and a proximal side pointing in the proximal direction. In Figures 1 and 2, the distal direction points to the left and the proximal direction points to the right. Furthermore, the pull cable anchoring element 30 has an upper side, which points toward the viewer in Figures 1 and 2, and a lower side, which points away from the viewer in Figures 1 and 2.

As shown in Figures 6 and 10, the pull cable anchoring element 30 has a base plate 31. The base plate 31 is formed as a flat plate. The base plate 31 has an el evation/proj ection 33 that projects from the base plate 31 toward a support element provided in the control body housing 10, which is formed by a support base 150 to be described below. In Figure 6, the elevation 33 projects downwards from the base plate 31. The elevation 33 may be formed in a cylindrical shape. The elevation 33 can be formed as a hollow cylinder. In this example, the elevation 33 has an inner hole 331 that extends along the longitudinal direction of the elevation 33. The inner hole 331 forms a passage opening that extends through the pull cable anchoring element 30.

On the base plate 31, a first hole 317 is provided on the distal side of the inner hole 331, see Figure 10, for a fixation pin (not shown). This fixation pin is used to adjust a zero position between the pull cable anchoring element 30 and the Bowden cable anchoring element 20, which is described in more detail below.

The hole 317 extends parallel to the inner hole 331. The hole 317 is located on an imaginary central axis of the base plate 31, which runs in a proximal-distal direction. This central axis of the base plate 31 connects the centre of the hole 317 and the centre of the inner hole 331. The pull cable anchoring element 30 has this central axis of the base plate 31 as a symmetry line. The portions to the right and left of the central axis of the base plate 31 are formed symmetrically to each other.

On the end side opposite to the base plate 31, the elevation 33 has an end portion 334. The end portion 334 can be formed as a bearing element. This bearing element can be rotatably mounted on the support base 150 in the control body housing 10. Any suitable designs can be selected for the rotatable mounting of the pull cable anchoring element 30 in the control body housing 10.

The outer diameter of the elevation 33 may taper in a portion from the base plate 31 to the end portion 334. The outer diameter of the end portion 334 is dimensioned such that the end portion 334 can be inserted into a receiving opening 152 of the support base 150 and such that the end portion 334 is configured to be rotated in the receiving opening 152 of the support base 150.

On the side opposite the elevation 33, the base plate 31 has a base 32. The base 32 rises from the base plate 31 in the direction opposite to the elevation 33. On the proximal side, the base 32 has a proximal base side 322 that serves as a pull cable arrangement surface. In the example, the proximal base side 322 is curved towards the proximal side, see Figures 7 and 8. The region of the proximal base side 322 that projects furthest to the proximal side is located at the centre of the proximal base side 322. At each of the left and right edges, the base 32 has a side edge 323-

Adjacent to the base 32, two protrusions 714 protrude from the base plate 31. The protrusions 714 extend in the direction opposite to the elevation 33. The protrusions 714 are formed in the shape of a pillar. The protrusions 714 are spaced apart from each other. Centred between the two protrusions 714, a gluing spot formed as an end gluing spot 71 is provided on the surface of the base plate 31. The pull cable 60 is glued at the end gluing spot 71 as described below. The centre between the two protrusions 714 and thus the centre point of the end gluing spot 71 is located on the central axis of the base plate 31 described above. The centre point of the inner hole 331 is located between the centre of the end gluing spot 71 and the centre of the hole 317 on the central axis of the base plate 31 described above.

On lateral portions (in Figure 10 at the top and bottom), a respective secondary gluing spot 72 is formed on the proximal base side 322 of the base 32. Thus, on the proximal base side 322 of the base 32, there are two secondary gluing spots 72, a right secondary gluing spot 72 (at the bottom in Figure 10) and a left secondary gluing spot 72 (at the top in Figure 10).

At each secondary gluing spot 72, an inward bulge is formed on the proximal base side 322 of the base 32 as an adhesive wiping wall (glue wiping wall) 75. Located opposite the adhesive wiping wall 75, a wall 73 rises on the base plate 31. Between the wall 73 and the adhesive wiping wall 75, an adhesive deposition region (glue deposition region) 74 is formed. The adhesive deposition region 74 is formed in the shape of a canyon between the adhesive wiping wall 75 and the wall 73. At the respective lateral ends of the canyon formed as an adhesive deposition region 74, a lateral opening 76 is formed, see Figure 9. A pull cable 60 is routed through the adhesive deposition region 74. The pull cable 60 is glued in the adhesive deposition region 74.

The adhesive deposition region 74 is shown filled with adhesive (glue) in Figures 8 and 9.

The gluing of the pull cable 60 at the pull cable anchoring element 30 is described in detail below. The gluing of the pull cable 60 will be described using the example of the pull cable 60a, see Figure 5.

Coming from the distal side, the pull cable 60 is routed in the Bowden cable 50, see Figure 5. The pull cable 60 extends from the Bowden cable 50 in a proximal direction without being sheathed. The pull cable 60 extends from the Bowden cable 50 in a proximal direction so that it is routed to the side edge 323 of the base 32. From the side edge 323 of the base 32, the pull cable 60 is routed to the proximal base side 322 of the base 32 and at and along the proximal base side 322 further towards the two protrusions 714. Here, the pull cable 60 passes the secondary gluing spot 72. More precisely, the pull cable 60 passes the first lateral opening 76 (lower lateral opening 76 in Figure 9) of the canyon formed as an adhesive deposition region 74, passes through the canyon formed as an adhesive deposition region 74, and passes the second lateral opening 76 (lower lateral opening 76 in Figure 9) of the canyon formed as an adhesive deposition region 74. The first lateral opening 76 forms an entrance opening for the pull cable 60 for entering the canyon. The second lateral opening 76 forms an exit opening for the pull cable 60 to exit the canyon. Adhesive (glue) is applied in the adhesive deposition region 74-

The pull cable 60 is routed onward at the proximal base side 322 up to the second protrusion 714 (upper protrusion 714 in Figure 7), as seen from the adhesive deposition region 74. The pull cable 60 is thus routed past the first protrusion 714 (lower protrusion 714 in Figure 7) along the proximal base side 322 to the second protrusion 714. The pull cable 60 is wound around the second protrusion 714. More precisely, the pull cable 60 is routed between the proximal base side 322 and the second protrusion 714 and wound around the second protrusion 714 once. Then the pull cable 60 is routed between the proximal base side 322 and the first protrusion 714 and wound around the first protrusion 714 once, see Figure 8. Between the first protrusion 714 and the second protrusion 714, adhesive (glue) is applied at the end gluing spot 71-

This means that the pull cable 60 is glued at the end gluing spot 71, which forms a primary gluing spot, and at the secondary gluing spot 72 in the adhesive deposition region 74.

More precisely, the pull cable 60a is glued at the end gluing spot 71 and at the secondary gluing spot 72 in the manner described.

The other pull cable 60b is glued at the end gluing spot 71 and at the secondary gluing spot 72 in the same way.

The two pull cables 60a and 60b can be tied, spliced, fused or otherwise connected at the end gluing spot 71. The connection point of the two pull cables 60a and 60b is then covered by the adhesive at the end gluing spot 71.

The pull cable anchoring element 30 has a plurality of (in the example there are four) protrusions 333 on the outer circumference of the elevation 33 between the base plate 31 and the end portion 334, see Figure 6. The plurality of protrusions 333 includes a distal protrusion 333, two lateral protrusions 333, and a proximal protrusion 333A. The proximal protrusion 333A projects from the elevation 33 in the proximal direction.

The proximal protrusion 333A is provided under the base plate 31. The proximal protrusion 333A is arranged lower than the other protrusions 333. The proximal protrusion 333A is positioned closer to the base plate 31 than to the end portion 334. The proximal protrusion 333A is used to define a permitted angle of rotation of the pull cable anchoring element 30.

At the upper side of the pull cable anchoring element 30 opposite to the elevation 33, the inner hole 331 opens out and forms an upper opening, see Figure 10. A guide 332 is provided on the inner circumference of the upper opening of the inner hole 331, see Figure 11. The guide 332 is formed as a recess in the inner circumferential surface of the upper opening of the inner hole 331. The guide 332 extends in the longitudinal direction of the inner hole 331. The upper opening of the inner hole 331 receives the lever element 40 described below. The lever element 40 is inserted into the guide 332. The guide 332 is used to transmit a rotational force from the lever element 40 to the pull cable anchoring element 30. The guide 332 has side faces that face each other and that are not parallel to each other. The side faces of the guide 332 taper (approach each other) in a downward direction (in the direction of insertion of the lever element 40).

At the inner hole 331, a rib 340 protrudes in the direction pointing away from the base plate 31 (upwards). The rib 340 protrudes over the edge of the inner hole 331 in the direction pointing away from the base plate 31. In the direction pointing away from the base plate 31, the rib 340 has a contact surface 341. The contact surface 341 faces away from the base plate 31. The contact surface 341 can be parallel to the base plate 31. In an alternative, the contact surface 341 can be inclined (slightly) relative to the base plate 31.

The individual components (base plate 31, base 32, elevation 33, wall 73, protrusion 333, end portion 334, protrusion 714) of the pull cable anchoring element 30 can be formed in one piece to form a pull cable anchoring element 30. Alternatively, any of the individual components of the pull cable anchoring element 30 can be formed separately and attached to each other. For example, they may be glued together.

Figures 13 to 15 show the Bowden cable anchoring element 20. The Bowden cable anchoring element 20 is used to anchor the Bowden cable 50. More specifically, a proximal end portion 51 of the Bowden cable 50 is anchored in the Bowden cable anchoring element 20.

The Bowden cable anchoring element 20 has a Bowden cable anchoring portion 22 in the form of a plate. For example, the Bowden cable anchoring portion 22 is formed as a trapezoidal plate, see Figure 13. The wider side of the trapezoid forms the proximal side of the Bowden cable anchoring portion 22. A groove 25 is formed in the plate of the Bowden cable anchoring portion 22. More precisely, two grooves 25 are formed on the top side of the plate of the Bowden cable anchoring portion 22. Each of the grooves 25 is used to receive a Bowden cable 50. Thus, the Bowden cable anchoring portion 22 has a left groove 25 (in Figure 13 at the top) and a right groove 25 (in Figure 13 at the bottom).

In the example, each groove 25 in the Bowden cable anchoring portion 22 is oriented in such a way that it is directed in a proximal direction to the respective side edge 323 of the base 32. The left groove 25 is directed toward the left side edge 323 of the base 32. The right groove 25 is directed toward the right side edge 323 of the base 32. Each groove 25 extends evenly and longitudinally in the Bowden cable anchoring portion 22. Along the extent of the groove 25, when viewed from the distal side, the groove 25 has a first portion 27 with narrowed width, a portion with enlarged width as a groove extension 26, and a second portion 27 with narrowed width. The first portion 27 with narrowed width and the second portion 27 with narrowed width have a smaller groove width than the slot extension 26. The proximal end portion 51 of the Bowden cable 50 is anchored in the groove extension 26. The proximal end portion 51 of the Bowden cable 50 can be pressed in, glued or otherwise attached in the groove extension 26. Due to this attachment (anchoring), the proximal end portion 51 of the Bowden cable 50 is secured in the groove extension 26 against any movement in the longitudinal direction of the Bowden cable 50.

An opening 29 is formed in the centre of the Bowden cable anchoring portion 22, which penetrates the Bowden cable anchoring portion 22 from bottom to top.

Under the Bowden cable anchoring portion 22, a substructure body 21 is formed on the Bowden cable anchoring portion 22. The substructure body 21 is formed in the shape of a box. The substructure body 21 is elongated and extends from the distal to the proximal direction in the installed position.

In the example, the substructure body 21 is formed cuboid-like. The substructure body 21 has side walls 201 and is closed on the upper side by the Bowden cable anchoring portion 22 and a roof portion 202, see Figure 13. On the lower side, which is opposite the Bowden cable anchoring portion 22 and the roof portion 202, the substructure body 21 is open. The inner sides of the side walls 201 each form an inner wall 211, see Figure 15.

In a region proximal to the Bowden cable anchoring portion 22, a second hole 217 is provided for the fixation pin (not shown). The hole 217 is provided centrally in the substructure body 21 as seen in the width (lateral) direction. The hole 217 extends perpendicular to the surface of the roof portion 202. The hole 217 runs parallel to the opening 29.

To create a correct alignment between the pull cable anchoring element 30 and the Bowden cable anchoring element 20, the aforementioned fixation pin (not shown) is placed in the hole 217 and the hole 317 before the pull cable 60 is secured. This creates a zero position between the pull cable anchoring element 30 and the Bowden cable anchoring element 20. In this zero position between the pull cable anchoring element 30 and the Bowden cable anchoring element 20, the pull cable anchoring element 30 and the Bowden cable anchoring element 20 are correctly aligned to each other in the proximal-distal direction. In the zero position, the pull cable 6o is secured and glued as described in the following. After curing of the adhesive, the fixation pin is removed again. The fixation pin is not present during operation. Therefore, the fixation pin is not shown in the drawings.

Between two inner walls 211 extending in the longitudinal direction of the substructure body 21, a cross member 213 is formed in the substructure body 21. The cross member 213 connects the two inner walls 211. The cross member 213 has an opening 214 in the centre. The opening 214 forms the lower opening of the hole 217. The cross member 213 forms a support rib for the hole 217.

On the proximal side, a rotary support portion 23 is formed on the substructure body 21, see Figures 13 to 15. The rotary support portion 23 is formed as a hollow cylinder. The axis of the hollow cylinder of the rotary support portion 23 extends in the upward and downward direction. Inside the hollow cylinder of the rotary support portion 23, a passage opening 231 therefore extends in the upward and downward direction. The hollow cylinder of the rotary support portion 23 has a perimeter wall 233. On the distal side of the rotary support portion 23, the perimeter wall 233 is formed on the substructure body 21. On the Bowden cable anchoring element 20, the opening 29, the hole 217 and the passage opening 231 are located in the order specified on an imaginary central axis of the Bowden cable anchoring element 20, which runs in the proximal-distal direction. The Bowden cable anchoring element 20 has this central axis as a symmetry line. The portions to the right and left of the central axis of the Bowden cable anchoring element 20 are formed symmetrically to each other.

In the extension direction of the passage opening 231, a plurality of inner protrusions 237 (in the example there are three) are formed on the inner wall of the passage opening 231. The inner protrusions 237 project inwards from the inner wall of the passage opening 231. The elevation 33 of the pull cable anchoring element 30 is inserted into the passage opening 231. When the elevation 33 is arranged in the passage opening 231, the inward-facing sides of the inner protrusions 237 are in contact with the outer circumference of the elevation 33. The inner protrusions 237 are used to reduce the coefficient of friction when the elevation 33 rotates in the passage opening 231. The inner protrusions 237 are also used to centre the end portion 334 of the base plate 31, the end portion 334 being formed as a bearing element.

On the proximal side, a recess 234 is formed on the upper side of the rotary support portion 23, see Figures 13 and 14. The recess 234 forms an incision into the perimeter wall 233. The recess 234 has an upward-facing flat horizontal surface 235 and two vertical side faces 236. The vertical side faces 236 extend upwards from the lateral ends of the horizontal surface 235. In the recess 234, the proximal protrusion 333A is guided in a movable manner. When the elevation 33 is arranged in the passage opening 231, the lower surface of the proximal protrusion 333A is in contact with the horizontal surface 235. Alternatively, the lower surface of the proximal protrusion 333A is spaced slightly apart from the horizontal surface 235. The elevation 33 can rotate in the passage opening 231 from an end position where the proximal protrusion 333A comes into contact with a vertical lateral surface 236 and another end position where the proximal protrusion 333A comes into contact with the other vertical lateral surface 236.

An upper end face 238 is formed on the upper side of the rotary support portion 23. The upper end face 238 forms an annular surface, which is interrupted by the recess 234, on the upper end face of the hollow cylinder of the rotary support portion 23. When the elevation 33 is arranged in the passage opening 231, the lower surfaces of the protrusions 333 are in contact with the upper end face 238, except for the proximal protrusion 333A. Alternatively, the lower surfaces of the protrusions 333 are in contact with the upper end face 238, and the lower surface of the proximal protrusion 333A is spaced slightly apart from the horizontal surface 235. In another alternative, the lower surfaces of the protrusions 333 are spaced slightly apart from the upper end face 238, and the lower surface of the proximal protrusion 333A is in contact with the horizontal surface 235.

The Bowden cable anchoring element 20 thus also serves to stabilize the rotary movement (of the elevation 33) of the pull cable anchoring element 30.

In addition, the Bowden cable anchoring element 20 is used to define the rotational range of the pull cable anchoring element 30 and thus of the lever element 40 described below.

Figures 16 and 17 show the lever element 40. The lever element 40 is formed as a single-arm lever. The lever element 40 has a lever arm 41. The lever arm 41 is formed of a base portion 42 and an end portion 43. The base portion 42 forms a base body of the lever element 40. The base portion 42 is an elongated body. The end portion 43 protrudes from the base portion 42. The end portion 43 is perpendicular to the base portion 42. In other words, the end portion 43 extends perpendicular to the base portion 42. The end portion 43 forms an actuating portion of the lever element 40.

On the end side of the base portion 42 opposite to the end portion 43, an anchoring protrusion 45 protrudes from the base portion 42. The anchoring protrusion 45 extends in the same direction as the end portion 43. The anchoring protrusion 45 and the end portion 43 can be parallel to each other, although the present disclosure is not limited to this.

The anchoring protrusion 45 is cylindrical in shape. The anchoring protrusion 45 includes a base 451. One side of the base 451 is connected to the base portion 42. The base 451 of the anchoring protrusion 45 extends from the base portion 42. On the side of the base 451 opposite from the base portion 42, two anchoring extensions 452 extend from the base 451. The anchoring extensions 452 project from the base 451 in a direction away from the base portion 42. Between the two anchoring extensions 452 a slot-like cavity 455 is formed.

On the end side facing away from the base portion 42, an end portion 454 of the respective anchoring extension 452 is formed. The anchoring extensions 452 can be bent into the cavity 455 due to their elasticity. Therefore, the end portions 454 of the two anchoring extensions 452 are configured to be bent toward each other.

On each anchoring extension 452, a constriction 453 is formed between the base 451 and the end portion 454. The constriction 453 is formed as a groove on the side of the respective anchoring extension 452 facing outward from the cavity 455. A snap-in element (snap-in protrusion) of the control body housing 10 can snap into the constriction 453 in order to lock the lever element 40.

On the side opposite the anchoring protrusion 45, the base portion 42 has a surface provided with markings 421, 422. The markings 421, 422 indicate the pivoting direction (direction of rotation) of the lever element 40. In the example, a marking 421 for pivoting downwards is shown, and another marking 422 for pivoting upwards is shown. This enables the operator to see that turning the lever element 40 in the direction indicated by the marking 421 - transmitted by the pull cable 60 - causes a downward pivoting movement on the distal side of the endoscope. Turning the lever element 40 in the direction indicated by the marking 422 will thus cause an upward pivoting movement - transmitted by the pull cable 60 - on the distal side of the endoscope.

On the side of the base portion 42 where the anchoring protrusion 45 is provided, an insertion rail 48 protrudes from the anchoring protrusion 45. The insertion rail 48 can extend parallel to the anchoring protrusion 45. The insertion rail 48 is configured to be inserted into the guide 332 of the pull cable anchoring element 30 in order to transfer a rotational force from the lever element 40 to the pull cable anchoring element 30. The insertion rail 48 has parallel side faces. On the side of the base portion 42 where the anchoring protrusion 45 is provided, a lever support protrusion 46 protrudes adjacent to the anchoring protrusion 45. The lever support protrusion 46 is located on the insertion rail 48. The lever support protrusion 46 can also extend parallel to the anchoring protrusion 45. At the end facing away from the base portion 42, the lever support protrusion 46 has a lever support surface 47 facing away from the base portion 42.

The pull cable anchoring element 30 and the lever element 40 together form a rotary assembly which can be rotated relative to the Bowden cable anchoring element 20.

Figure 4 shows details of the control body housing 10. The control body housing 10 of the example is formed of two control body halves, of which only the lower half is shown as the control body housing 10 in Figures 1 to 4.

The control body housing 10 has a support base 120 for the Bowden cable anchoring element 20. The support base 120 protrudes tower-like from the control body housing 10 in a vertical direction. The support base 120 has a central inner opening 122. The inner opening 122 extends along the axis of the support base 120.

The control body housing 10 also has a support wall 130 that protrudes vertically from the control body housing 10. The support wall 130 is formed by a longitudinal wall 132 and a transverse wall 134. The support wall 130 is formed t-shaped in plan view. Here the longitudinal wall 132 forms the vertical leg and the transverse wall 134 forms the horizontal leg of the T- shape, wherein the "T" formed by the longitudinal wall 132 and the transverse wall 134 is positioned as shown in Figure 4.

The control body housing 10 also has a support base 150 for the rotary assembly, which is formed of the pull cable anchoring element 30 and the lever element 40. The support base 150 protrudes tower-like from the control body housing 10 in a vertical direction. The support base 150 has a central receiving opening 152. The receiving opening 152 extends along the axis of the support base 150.

The support base 120, the support wall 130 and the support base 150 are arranged relative to each other such that the support wall 130 is located between the support base 120 and the support base 150. The support base 120, the support wall 130 and the support base 150 are arranged approximately along a line in this sequence, see Figure 4. The support base 150 has a snap-in element, not shown, (e.g. formed as a snap-in protrusion) in the receiving opening 152 that snaps in place in the constriction 453 of the lever element 40. This means that the entire pull cable actuating device 16 is secured to the control body housing 10 (by snapping in) via the lever element 40.

The snap-in element that snaps in place in the constriction 453 of the lever element 40 can be embodied as a single-use snap-in element that locks after it has snapped in place at the constriction 453 and can no longer be released by the user without damaging or destroying the control body housing 10.

The snap-in element that snaps in place in the constriction 453 of the lever element 40 can alternatively be embodied as a re-releasable snap-in element. The user is then allowed to remove the lever element 40 again.

Assembling the pull cable actuating device

In the following, the assembly of the pull cable actuating device 16 is described. The pull cable actuating device 16 is formed of the Bowden cable anchoring element 20, the pull cable anchoring element 30, and the lever element 40. When assembling the pull cable actuating device 16, the Bowden cable anchoring element 20 and the pull cable anchoring element 30 are assembled first. To do this, the Bowden cable anchoring element 20 is held such that the upper side of the Bowden cable anchoring element 20 faces upwards. The pull cable anchoring element 30 is held in such a way that the elevation 33 points downwards. The pull cable anchoring element 30 is held in such a way that the protrusion 333A is arranged above the recess 234. Then the elevation 33 of the pull cable anchoring element 30 is inserted into the passage opening 231 of the rotary support portion 23 of the Bowden cable anchoring element 20 until the lower surfaces of the protrusions 333 bear against the upper end surface 238 of the rotary support portion of the Bowden cable anchoring element 20. This assembling state is shown in Figure 12. The lever element 40 is then inserted. To do this, the anchoring protrusion 45 is preinserted into the upper opening of the inner hole 331. The lever element 40 is rotated such that the insertion rail 48 is aligned relative to the guide 332 of the pull cable anchoring element 30. Then the lever element 40 is pushed completely into the pull cable anchoring element 30 by pushing the insertion rail 48 into the guide 332 until the lever support surface 47 of the lever support protrusion 46 rests on the contact surface 341 of the rib 340, i.e. is in contact with it. In this situation, the parallel side faces of the insertion rail 48 bear against the side faces of the guide 332 that taper with increasingly deeper position. This prepared assembly of the pull cable actuating device 16 is now inserted into the control body housing io. To do this, the Bowden cable anchoring element 20 is placed on the support base 120 and the support wall 130, and the rotary assembly is placed on the support base 150. More precisely, the Bowden cable anchoring element 20 is arranged on the support base 120 and the support wall 130 in such a way that the portion of the cross member 213 that has the opening 214 bears against the top edge of the longitudinal wall 132. In this situation, the portion of the cross member 213 that has the opening 214 is located distally from the connection point of the legs of the "T" formed by the longitudinal wall 132 and the transverse wall 134. The side faces of the longitudinal wall 132 facing away from the connection point of the longitudinal wall 132 and the transverse wall 134 then bear against the inner wall 211 of the substructure body 21. The Bowden cable anchoring element 20 is thus fixed to the control body housing 10.

In this situation, the substructure body 21 is arranged on the support base 120 in such a way that the opening 29 is centred with the inner opening 122. At the same time, the end portion 334 is placed in the receiving opening 152 and the anchoring extension 452, pushed through the end portion 334 and protruding from the end portion 334, is locked in the receiving opening 152 with the snap-in element which lock in place in the constriction 453 of the lever element 40. This means that the entire pull cable actuating device 16 is secured to the control body housing 10 (by snapping in) via the lever element 40.

A suitable connecting element, not shown, can then be inserted through the opening 29 and the inner opening 122 in order to anchor the Bowden cable anchoring element 20 firmly to the control body housing 10.

Finally, the control body housing 10 is closed off by connecting both halves of the control body housing 10 together.

Function of the installed pull cable actuating device

When the pull cable actuating device 16 is installed on the control body housing 10, the pull cable 60 can be tensioned or relieved by simply turning the lever element 40 in the desired direction. This means that by turning the lever element 40, the pull cable anchoring element 30 rotates relative to the Bowden cable anchoring element 20. As a result, the pull cable 60 is pulled out of the proximal end portion 51 of the Bowden cable 50 (tensioned) or pushed into the proximal end portion 51 of the Bowden cable 50 (relieved; more precisely, the pull cable 60 is pulled into the proximal end portion 51 of the Bowden cable 50). This causes the desired pull cable movement on the distal side of the endoscope. For example, if the user pivots the lever element 40 in the direction D (downward) shown by the marking 421, an element (not shown) arranged at the distal end of the pull cable 60 will move downwards. If, on the other hand, the user pivots the lever element 40 in the direction U (upward) shown by the marking 422, an element (not shown) arranged at the distal end of the pull cable 60 will move upwards.

Advantages and effects

The pull cable 60 is glued at the proximal end gluing spot (primary gluing spot) 71 and at the secondary gluing spot 72 positioned distally from the end gluing spot 71. As the pull cable 60 is thus glued at two positions along the pull cable by means of a respective separate gluing spot, the attachment of the pull cable to the pull cable anchoring element 30 is very secure. Since the protrusions 714 can also absorb pulling/tensile forces acting on the pull cable 60, the attachment of the pull cable 60 to the pull cable anchoring element 30 becomes even more secure.

Attaching the pull cable to the pull cable anchoring element 30 is simple. The proximal end portion 51 of the Bowden cable 50 only needs to be anchored in the groove 25 on the Bowden cable anchoring element 20 and the pull cable 60 protruding from the Bowden cable 50 must be laid at the path provided along the proximal base side 322 to the protrusions 714 and wound around the protrusions 714. The gluing can then take place. The above-mentioned operations and process steps are simple and can be carried out quickly. The manufacture can even take place in mass production. This makes the manufacture cost-effective.

The proximal end gluing spot (primary gluing spot) 71 and the secondary gluing spot 72 require a particularly small space. The attachment of the pull cable 60 at the pull cable anchoring element 30 therefore requires barely any space. These space savings are particularly advantageous in the context of the development of endoscopes that are as small as possible.

Alternatives

In the example, a lever element 40 is used on the pull cable anchoring element 30 to rotate the pull cable anchoring element 30. Alternatively, the pull cable anchoring element and the lever element can be formed as a single piece. In the example, two Bowden cables 50 are anchored in the Bowden cable anchoring element 20 and two pull cables 60 are anchored in the pull cable anchoring element 30. Alternatively, only one Bowden cable 50 can be anchored in the Bowden cable anchoring element 20 and only one pull cable 60 can be anchored in the pull cable anchoring element 30. The one pull cable 60 is routed in the one Bowden cable 50.

In the example, a first pull cable 60a and a second pull cable 60b are applied in such a way that their respective pull cable ends are glued at the end gluing spot 71 at the pull cable anchoring element 30. Alternatively, only one pull cable can be used, which is routed from the distal side via one Bowden cable 50 to the end gluing spot 71 and from there via the other Bowden cable 50 back to the distal side. At the end gluing spot 71, the one pull cable is glued at the pull cable anchoring element 30.

In the example, the pull cable anchoring element 30 has a plurality of protrusions 333 on the outer circumference of the elevation 33 between the base plate 31 and the end portion 334. Alternatively, only one protrusion 333 can be provided, namely the protrusion 333A, which is positioned below the protrusions 714. In other words, only the protrusion 333A can be provided on the proximal side of the elevation 33.

Any number of inner protrusions 237 can be provided.

Since the elevation 33 of the pull cable anchoring element 30 can be arranged in the rotary support portion 23 of the Bowden cable anchoring element 20 and the Bowden cable anchoring element 20 can be securely supported in the endoscope housing 10, the receiving opening 152 can be omitted in an alternative design.

List of reference signs

I endoscope

10 endoscope housing

II insertion tube

12 fastening connector

13 suction connector

14 suction channel

15 instrument inlet portion

16 pull cable actuating device

20 Bowden cable anchoring element 21 substructure body

22 Bowden cable anchoring portion

23 rotary support portion

25 groove

26 groove extension

27 portion with narrowed width

29 opening

30 pull cable anchoring element

31 base plate

32 base

33 elevation

40 lever element

41 lever arm

42 base portion

43 end portion

45 anchoring protrusion

46 lever support protrusion

47 lever support surface

48 insertion rail

50 Bowden cable

51 proximal end portion of Bowden cable

60 pull cable

71 end gluing spot

72 secondary gluing spot

73 wall

74 adhesive deposition region

75 adhesive wiping wall

76 lateral opening

120 support base for Bowden cable anchoring element

122 inner opening

130 support wall

132 longitudinal wall

134 transverse wall

150 support base for rotary assembly

152 receiving opening

201 side walls

202 roof portion 211 inner wall

213 cross member

214 opening

217 hole for centring pin

231 passage opening

233 perimeter wall

234 recess

235 horizontal surface

236 vertical side surface

237 inner protrusion

238 upper end face

317 hole for centring pin

322 proximal base side

323 side edge of the base

331 inner hole

332 guide

333 protrusion

333A proximal protrusion

334 end portion

340 rib

341 contact surface

421 marking

422 marking

451 base

452 anchoring extension

453 constriction

454 end portion

455 cavity

714 protrusion

Claims

Claims An endoscope comprising a proximal endoscope housing (io); and a pull cable actuating device (16) arranged in the proximal endoscope housing (io), to which a pull cable (6o) is anchored, which extends in the endoscope to a distal side of the endoscope so that a pull cable movement can be used on the distal side of the endoscope; wherein the pull cable actuating device (16) comprises an assembly of a pull cable anchoring element (30) and a Bowden cable anchoring element (20), a Bowden cable (50), extending to the distal side of the endoscope and through which the pull cable (60) is routed, is anchored to the Bowden cable anchoring element (20), and the pull cable (60) is glued at the pull cable anchoring element (30). The endoscope according to claim 1, wherein the Bowden cable anchoring element (20) comprises a groove (25), wherein, along the groove (25), a proximal end portion (51) of the Bowden cable (50) is anchored immovably relative to the Bowden cable anchoring element (20). The endoscope according to claim 1 or 2, wherein the proximal end portion (51) of the Bowden cable (50) is glued in the Bowden cable anchoring element (20). The endoscope according to any one of claims 1 to 3, wherein the pull cable anchoring element (30) is rotatably mounted in the endoscope housing (10), and the Bowden cable anchoring element (20) is non-rotatably mounted in the endoscope housing (10) distally from the pull cable anchoring element (30). The endoscope according to any one of claims 1 to 4, wherein the assembly of the pull cable anchoring element (30) and the Bowden cable anchoring element (20) is made of plastic and is removable from the endoscope housing (10). The endoscope according to any one of claims 1 to 5, wherein

25 the pull cable anchoring element (30) comprises a lever element (40) that is configured to be inserted from the outside of the endoscope housing (10), wherein the pull cable anchoring element (30) is rotatable relative to the endoscope housing (10) and relative to the Bowden cable anchoring element (20) by actuating the lever element (40). The endoscope according to any one of claims 1 to 6, wherein two Bowden cables (50) extending to the distal side of the endoscope are anchored in the Bowden cable anchoring element (20), through each of which a pull cable (60) is routed, which is anchored to a gluing spot (71, 72) in the pull cable anchoring element (30). The endoscope according to any one of claims 1 to 6, wherein two Bowden cables (50) extending to the distal side of the endoscope are anchored in the Bowden cable anchoring element (20), through which a single pull cable is routed, the proximal reversal point of which is anchored to a gluing spot in the pull cable anchoring element (30). The endoscope according to any one of claims 1 to 8, wherein the pull cable (60) is glued at the pull cable anchoring element (30) at at least two gluing spots (71, 72) that are spaced apart from each other. The endoscope according to claim 9, wherein the two gluing spots (71, 72) comprise a proximal end gluing spot (71) and a secondary gluing spot (72) positioned distally from the end gluing spot (71), wherein the pull cable (60) is glued at the secondary gluing spot (72) on the pull cable anchoring element (30) coming from the distal side and is glued at the end gluing spot (71) on the pull cable anchoring element (30) further along in the proximal direction. The endoscope according to claim 10, wherein an adhesive wiping wall (75) is formed at the secondary gluing spot (72) on the pull cable anchoring element (30). The endoscope according to claim 11, wherein at the secondary gluing spot (72) on the pull cable anchoring element (30), a further wall (73) is formed opposing the adhesive wiping wall (75), and at the secondary gluing spot (72) on the pull cable anchoring element (30) between the adhesive wiping wall (75) and the other, opposing wall (73), an adhesive deposition region (74) is formed in which the pull cable (60) is glued at the pull cable anchoring element (30). The endoscope according to claim 10, wherein adjacent to the end gluing spot (71) on the pull cable anchoring element (30), a protrusion (714) rising from the pull cable anchoring element (30) is provided, around which the pull cable (60) glued at the end gluing spot (71) is wound. The endoscope according to claim 10, wherein adjacent to the end gluing spot (71) on the pull cable anchoring element (30), two protrusions (714) rising from the pull cable anchoring element (30) are provided, around both of which the pull cable (60) glued at the end gluing spot (71) is wound, with the end gluing spot (71) being arranged between the protrusions (714).