Shaft, surgical instrument and method for mounting a working channel and / or an optical imaging device to a shaft

Abstract

The present invention provides a shaft (1) for a surgical instrument, in particular for a flexible endoscopic instrument, comprising: an inner shaft structure layer (2) with a distal end (3) and a proximal end (4), wherein the inner shaft structure layer (2) has a through-opening (5) for receiving a working channel and / or an optical imaging device, wherein the through-opening (5) extends axially from the proximal end (4) to the distal end (3), and wherein the inner shaft structure layer (2) comprises a slot (6) for laterally opening the inner shaft structure layer (2), wherein the slot (6) is arranged at least sectionally between the proximal end (4) and the distal end (3).Furthermore, the present invention provides a surgical instrument (100) with such a shaft (1) and a method for mounting a working channel and / or an optical imaging device to a shaft (1) for a surgical instrument.

Description

TECHNICAL AREA

[0001] The present invention relates to a shaft for a surgical instrument, in particular for a flexible endoscopic instrument, and to a surgical instrument, in particular a flexible endoscopic instrument, with such a shaft. Furthermore, the present invention relates to a method for mounting a working channel and / or an optical imaging device to a shaft for a surgical instrument, in particular to such a shaft. BACKGROUND

[0002] Surgical instruments with a tube-like shaft, such as flexible endoscopic instruments, are used for a variety of applications in medicine and engineering. These flexible endoscopic instruments comprise a flexible, elongated shaft designed for insertion into a cavity, such as an internal body cavity or a cavity within a technical object. Typically, an endoscope lens is located at the tip of the shaft, which produces an image of the scene within the observed cavity.To capture and transmit the endoscopic image from the distal (i.e., furthest from the observer) to the proximal (i.e., closer to the observer) end of the endoscopic instrument, an ordered bundle of optical fibers or an electronic image sensor, such as a CCD chip, extending inside the shaft can be provided. This sensor is located in the distal end of the shaft, and its signals are transmitted to the proximal end via electrical conductors extending inside the shaft. Since there is usually insufficient light in the observed cavity, a fiber optic system can also be arranged inside the shaft to direct light to the distal end of the endoscopic instrument, where it serves to illuminate the cavity.Furthermore, the shaft of the endoscopic instrument may include one or more working channels for the insertion of endoscopic working instruments from the proximal to the distal end of the shaft in order to perform procedures within the cavity.

[0003] Surgical instruments with a tube as a shaft are also known, comprising a flexible, elongated shaft suitable for insertion into a cavity, such as an internal body cavity or a cavity of a technical object. Such a flexible endoscopic instrument can be used to perform manipulations within the cavity and, for example, can be designed as a grasping instrument for grasping and manipulating tissue or objects within the body cavity or the cavity of a technical object. For this purpose, a tool is arranged at the distal end of the shaft, which can be operated from the proximal end of the shaft via a transmission element extending inside the shaft.Such a flexible endoscopic instrument does not usually have its own optics for capturing an endoscopic image, but can be used in particular together with a flexible endoscopic instrument.

[0004] It is often desirable to be able to angle the distal end of the shaft, i.e., the tip of the endoscope or endoscopic instrument, to facilitate the insertion of the endoscope or endoscopic instrument through a non-straight channel, to allow the tip to be moved laterally within a cavity, and to change the viewing direction of an optical system located at the tip of the endoscopic instrument or the working direction of a tool located at the tip of the endoscopic instrument. For this purpose, the shaft has a controllable section, in particular a controllable end section, which can be actively angled by a desired amount in a desired direction and can be controlled from the proximal end of the endoscopic instrument.The shaft for a flexible endoscopic instrument does not itself need to have a tool and a transmission means, but can, for example, include a working channel into which a flexible endoscopic working instrument, which cannot be actively angled and which has such a tool, can be inserted up to the distal end of the shaft and possibly beyond, so that the flexible working instrument can be angled with the help of the shaft.

[0005] The flexible shaft is typically the part of the flexible endoscope that transmits torque and force from a handle to a distal section. Because the flexible shaft is hollow, it also protects internal components such as the working channel, light / image cables, springs, and / or push-pull wires.

[0006] Document US 2021 / 153728 A1 describes endoscopic devices with one or more working channels and methods for manufacturing an endoscopic device with improved working channels.

[0007] However, loading components of the flexible endoscopic instrument into the working shaft is time-consuming, and so far there is no automation solution. REVELATION OF THE INVENTION

[0008] One object of the present invention is to provide a shaft that can simplify the assembly process of a working channel for a surgical instrument.

[0009] According to the invention, this problem is solved by a shaft for a surgical instrument having the features of claim 1, by a surgical instrument having the features of claim 12 and / or by a method for mounting a working channel and / or an optical imaging device to a shaft for a surgical instrument having the features of claim 13.

[0010] According to a first aspect of the invention, a shaft for a surgical instrument, in particular for a flexible endoscopic instrument, is provided. The shaft comprises an inner shaft structure layer with a distal and a proximal end, wherein the inner shaft structure layer includes a through-opening for receiving a working channel and / or an optical imaging device. The through-opening extends axially from the proximal end to the distal end. The inner shaft structure layer includes a slot for laterally opening the inner shaft structure layer, wherein the slot is arranged at least partially between the proximal end and the distal end.

[0011] According to a second aspect of the invention, a surgical instrument, in particular a flexible endoscopic instrument, is provided. The surgical instrument comprises a shaft according to the first aspect of the invention, which is arranged at a distal end of the surgical instrument.

[0012] According to a third aspect of the invention, a method for mounting a working channel and / or an optical imaging device to a shaft for a surgical instrument, in particular to a flexible shaft according to the first aspect of the invention, is provided. The method comprises the steps: Providing a shaft comprising an inner shaft structure layer with a distal end and a proximal end, wherein the inner shaft structure layer includes a through-opening for receiving a working channel and / or an optical imaging device, the through-opening extending axially from the proximal end to the distal end, and wherein the inner shaft structure layer includes a slot for laterally opening the inner shaft structure layer, the slot being arranged at least sectionally between the proximal end and the distal end. Loading the working channel through the slot into the through-opening.

[0013] A fundamental aspect of the invention is to provide a working whorl or shaft of a flexible endoscope for all the main components of the surgical instrument, particularly the flexible endoscopic instrument, which includes an inner shaft structure layer or an inner profile. Control wires, a working channel, and an optical imaging device are housed within the inner shaft structure layer. The inner shaft structure layer or the inner profile comprises the slot or the laterally open slot. For example, the inner shaft structure layer can be configured as a carcass structure. The distal end of the shaft corresponds to the distal end of the surgical instrument. Furthermore, the methods disclose a way of mounting the whorls on the endoscopic instrument.

[0014] A particular advantage of the solution according to one aspect of the invention is that the loading of the shaft components can be at least partially automated.

[0015] Another advantage of the present invention is that it allows for simpler and faster assembly of the working channel and / or the optical imaging device.

[0016] The inner shaft structure layer can, for example, be based on an extruded profile. This means the inner shaft structure layer can be produced through an extrusion process. For example, the working channel can be loaded into the through-hole by pressing the slot.

[0017] The working channel can be inserted into a tubular shaft of the surgical instrument. The working channel is mounted or guided at at least one end, particularly a proximal end, of a rod within the surgical instrument. Specifically, the rod is mounted or guided in the tubular shaft in such a way that the working channel cannot shift or rotate axially relative to the tubular shaft.

[0018] If the surgical instrument is to be operated by a user, such as a surgeon, it includes a handle as a holding device for the user. The operating interface then transmits a force or torque that the user applies to the handle, for example to a force transmission element, via a suitable actuator (e.g., a movable handle arm).

[0019] If the surgical instrument is to be connected to a robot, the surgical instrument includes a corresponding connection interface for the robot, which can apply an axial force or torque to the force transmission element via the operating interface.

[0020] Advantageous embodiments and further developments will result from the description with reference to the figures.

[0021] According to some embodiments of the invention, the inner shaft structure layer has an inner surface and an outer surface facing away from the inner surface, with the slot extending radially from the outer surface to the inner surface. The slot thus divides the inner shaft structure layer over its entire thickness.

[0022] According to some further embodiments of the invention, the shaft further comprises an outer shaft layer arranged on the outer surface of the inner shaft structure layer. Thus, the outer shaft layer can support the inner shaft structure layer. For example, the outer shaft layer can include reinforcing elements for strengthening the shaft. The outer shaft layer can be configured as a coating that partially encloses the inner shaft structure layer.

[0023] According to some further embodiments of the invention, the inner shaft structure layer and the outer shaft layer are materially bonded together.

[0024] According to some further embodiments of the invention, the inner shaft structure layer and the outer shaft layer have an interference fit.

[0025] Optionally, the inner shaft structure layer and the outer shaft layer can have a press fit and be materially bonded together.

[0026] According to some further embodiments of the invention, the outer shaft layer consists of a mesh covering, a metal, or a liquid crystal polymer. Additionally, the outer shaft layer can be crosslinked with a biocompatible material, such as polyurethane, thermoplastic elastomer, or impregnated pelletane. In particular, the outer shaft layer can comprise a crosslinked polymer region, for example, in combination with a pure polymer region.

[0027] According to some further embodiments of the invention, the shaft also has an intermediate layer arranged radially between the inner shaft structure layer and the outer shaft layer. For example, the intermediate layer is configured as a heat-activated film so that it bonds materially with the inner shaft structure layer and the outer shaft layer. This eliminates the need for adhesive rings at the distal end, particularly when the heat-activated film is applied at the distal end.

[0028] According to some further embodiments of the invention, the slot is arranged in a section of the inner shaft structure layer that is configured to be articulated in at least one plane. Thus, the section forms a flexible shaft section. In embodiments where the shaft comprises the articulated section and the outer shaft layer with a mesh, the mesh in the articulated section can be omitted. In particular, the outer shaft layer can comprise a cross-linked polymer region for the shaft apart from the section and a pure polymer region for the section.

[0029] Optionally, the section comprises a plurality of shaft sections arranged in series, with the slot extending axially through the plurality of shaft sections. The plurality of shaft sections arranged in series corresponds to an active bending section of the surgical instrument, in particular a flexible endoscopic instrument.

[0030] According to some further embodiments of the invention, the inner shaft structure layer has a recess that penetrates the inner shaft structure layer on two sides opposite the slot. Thus, any longitudinal body, for example a pin, can be inserted into the recess to secure the slot against opening.

[0031] According to some further embodiments of the invention, the slot forms a bay with respect to the axial extent of the inner shaft structure layer. The bay can have the shape of a U, a V, a hammer, a peninsula, or the like.

[0032] According to some further embodiments of the invention, the slot is arranged on two opposite lateral sides of the inner shaft structure layer. This simplifies the opening of the inner shaft structure layer.

[0033] Optionally, the inner shaft structure layer can be elastically deformable in at least one area of ​​the slot.

[0034] Optionally, the surgical instrument may also include a working channel for conveying fluids or medical tools from an operator interface to the distal end of the shaft and two guide wires extending from the operator interface through the inner shaft structure layer to articulate a section of the inner shaft structure layer.

[0035] The user interface and / or the surgical instrument may be made of a plastic material. For example, the surgical instrument may be made entirely of a plastic material, particularly if the surgical instrument is intended for single use only.

[0036] According to some further embodiments of the invention, the method further comprises a step of arranging an outer shaft layer on the inner shaft structure layer after the working channel has been loaded. In particular, the outer shaft layer can be drawn over the inner shaft structure layer.

[0037] Additionally or alternatively, an intermediate layer can be applied to the inner shaft structure layer after the working channel has been loaded. The outer shaft layer can then be placed on top of this intermediate layer. Furthermore, the outer shaft layer can be produced, for example, by an extrusion process.

[0038] According to some further embodiments of the invention, the step of arranging the outer shaft layer includes expanding the outer shaft layer using compressed air, so that the outer shaft layer is drawn over the inner shaft structure layer or the intermediate layer. Thus, when the compressed air is stopped, the outer shaft layer can be compressed, so that the inner shaft structure layer and the outer shaft layer have an interference fit.

[0039] Optionally, the process can further include a step of heating the outer shaft layer so that the outer shaft layer bonds with the inner shaft structure layer. For example, this heating can be achieved using infrared heating.

[0040] The multiple shaft sections can be connected by an integrated connecting link, which links adjacent shaft sections so that they are pivotally articulated in a plane. For example, each shaft section can be configured as a vortex element coupled to the adjacent vortex element in such a way that pivoting of the vortex element relative to the adjacent vortex element is provided along a radial axis. For example, the inner shaft structure layer can have a circular or oval shape. This allows the inner shaft structure layer to have a constant diameter.

[0041] Furthermore, the surgical instrument may also include a working channel for conveying fluids or medical tools from the operator interface to the distal end of the shaft and two guide wires extending from the operator interface through the through-hole to articulate the shaft.

[0042] In other words, the distal tip with its vertebral subassembly can be loaded into the shaft through the slot or lateral opening slot, and the outer shaft cover can be pulled over the structure or inner shaft structure layer. Compressed air can be used to expand the outer shaft cover. The outer shaft cover can then be bonded to the inner shaft layer or inner shaft structure layer using heating / IR heating. The result could be a supported, loaded shaft capable of transmitting force and torque.

[0043] The foregoing embodiments and further developments can be combined with one another as appropriate. Further possible configurations, further developments, and implementations of the invention also include combinations of features of the invention described above or below in the exemplary embodiments, even if not explicitly mentioned. In particular, a person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the present invention. BRIEF DESCRIPTION OF THE FIGURES

[0044] The present invention will now be explained in more detail with reference to the exemplary embodiments shown in the schematic figures. These show: Fig. Figure 1 shows a hand-held surgical instrument, in particular a steerable flexible endoscopic instrument, in an overall view according to an embodiment of the invention; Fig. Figure 2 shows a perspective view of a shaft for a flexible endoscopic instrument according to a further embodiment of the invention; Fig. Figure 3 shows a perspective view of a shaft for a flexible endoscopic instrument according to a further embodiment of the invention; Fig. Figure 4 shows a perspective view of the shaft of Fig. 2 or Fig. 3, comprising an outer shaft layer according to a further embodiment of the invention; Fig. Figure 5 shows a side view and a front view of a section of two shafts comprising an intermediate layer and an outer layer according to a further embodiment of the invention; Fig. Figure 6 shows a detailed view of a shaft section of the shaft of Fig. 2; Fig. Figure 7 shows a sectional view of a shaft according to a further embodiment of the invention; Fig. Figure 8 shows a sectional view of a shaft according to a further embodiment of the invention and Fig. Figure 9 shows a schematic flowchart of a method for mounting a working channel and / or an optical imaging device to a shaft for a surgical instrument according to a further embodiment of the invention.

[0045] The accompanying figures are intended to provide a deeper understanding of the embodiments of the invention. They illustrate embodiments and are used in conjunction with the description to explain the principles and concepts of the invention. Further embodiments and many of the advantages mentioned become apparent when considering the drawings. The elements of the drawings are not necessarily drawn to scale with respect to one another. Directional terms such as "above," "below," "left," "right," "over," "below," "horizontal," "vertical," "front," "back," and similar terms are used for explanatory purposes only and are not intended to limit the general applicability to specific configurations shown in the figures.

[0046] In the figures of the drawing, identical, functionally equivalent and equally effective elements, features and components - unless otherwise explained - are each provided with the same reference symbols. DETAILED DESCRIPTION OF THE DRAWINGS

[0047] Fig. Figure 1 shows an embodiment of a hand-held surgical instrument 100, in particular a steerable flexible endoscopic instrument 100, in an overall view.

[0048] As in Fig. As shown schematically in Figure 1, the flexible endoscopic instrument 100 typically consists of a handpiece 101 and a shaft 1, the handpiece 101 being attached to a proximal end of the shaft 1. The handpiece 101 may have an outer housing 102 made of a plastic and / or metal material. A first handwheel 103 and a second handwheel 104 for controlling a deflection of a steerable section 1a of the shaft 1 are arranged on the underside of the housing 102, as described below. Typically, the first and second handwheels 103, 104 are arranged coaxially, and a knob 105 for controlling a deflection brake associated with the second handwheel 104 is provided on an outer surface of the second handwheel 104.Furthermore, the handpiece 101 can have a variety of control buttons 106 for controlling various functions of the flexible endoscopic instrument 100, such as controlling the imaging and / or illumination system and / or irrigation and suction pumps. The handpiece 101 can be connected to an external video unit or video monitor via a port 107 and to an external light source via a light cable 108.

[0049] In addition, an instrument port 109 may be provided for the insertion of endoscopic instruments which are advanced through one or more respective channels to a distal end of the shaft 1 in order to handle tissue or other objects in a cavity into which the shaft 1 can be inserted.

[0050] At its distal end, the shaft 1 comprises a steerable section 1a. The steerable section 1a can form a distal end section of the shaft 1 or, as in Fig. Figure 1 shows a distal end cap 11 that can accommodate an imaging optic and an electronic image sensor to provide an endoscopic image of a cavity into which the shaft 1 is inserted. The image signal generated by the image sensor can be transmitted via electrical cables extending through the shaft 1 and the handpiece 101 to the port 107 for processing and display by an external video unit. The shaft 1 is flexible overall, allowing it to be advanced through an endoscopic access or hollow organ toward a cavity to be observed and to conform to any curved shape of the access or organ. The steerable section 1a, on the other hand, can be actively bent by rotating the handwheels 103, 104.For this purpose, the steerable section 1a comprises an internal structure consisting of a plurality of shaft sections and is thus deflectable or articulated in one or more planes. The plurality of shaft sections can be covered by a flexible tube to form a smooth outer surface, the shaft 1 having a uniform cross-sectional shape and diameter overall.

[0051] To control the deflection of the multitude of shaft sections, two counter-rotating control wires are used (in Fig. 1 not shown) provided, which extend on opposite sides within the plurality of shaft sections and by whose longitudinal movement the steerable section 1a can be bent to one side or the other, as in Fig. Figure 1 is shown symbolically. The control wires extend along the shaft 1 and are connected at their proximal ends to a deflection control mechanism arranged in the handpiece 101. This mechanism can be operated by a user by turning the handwheels 103 and 104 to deflect the steerable section 1a. In the illustrated embodiment, the steerable section can be bent or pivotally moved within a first plane corresponding to the plane of the drawing, whereby a deflection angle can be controlled by turning the first handwheel 103. Furthermore, the steerable section 1a can be bent in a second plane perpendicular to the first plane and perpendicular to the plane of the drawing, whereby a corresponding deflection angle can be controlled by turning the second handwheel 104.

[0052] The shaft 1 comprises, by way of example, an inner shaft structure layer with a distal end and a proximal end, wherein the inner shaft structure layer includes a through-opening for receiving a working channel and / or an optical imaging device. The through-opening extends axially from the proximal end to the distal end. Furthermore, the inner shaft structure layer includes a slot for laterally opening the inner shaft structure layer, wherein the slot is arranged at least partially between the proximal end and the distal end. For example, the slot extends substantially at least partially axially between the proximal end and the distal end.

[0053] Fig. Figure 2 shows a perspective view of a shaft 1 for a flexible endoscopic instrument.

[0054] The flexible endoscopic instrument (not shown) can be configured, for example, as a handheld endoscopic instrument, incorporating a handle for manual operation by a user, as exemplified in Fig. Figure 1 illustrates this. Alternatively, the handle of an endoscopic instrument can be configured as a suitable interface for robot guidance. The flexible endoscopic instrument comprises the shaft 1, which is located at a distal end of the instrument. The flexible endoscopic instrument can further include a control interface, with the shaft 1 coupled to the control interface. The shaft 1 and the working channel can be configured as a circular tube. The working channel is configured for conveying fluids or medical instruments. Furthermore, the shaft 1 can be arranged concentrically within the control interface.

[0055] The shaft 1 comprises an inner shaft structure layer 2 with a distal end 3 and a proximal end 4. The inner shaft structure layer 2 includes a through-opening 5 for receiving a working channel or an optical imaging device, or both. The through-opening 5 extends axially from the proximal end 4 to the distal end 3.

[0056] The inner shaft structure layer 2 comprises a slot 6 for laterally opening the inner shaft structure layer 2, wherein the slot 6 is arranged at least sectionally between the proximal end 4 and the distal end 3. Optionally, the inner shaft structure layer 2 can be elastically deformable at least in a region of the slot 6.

[0057] In Fig. In Figure 2, the slot 6 is arranged by way of example in a section 9 of the inner shaft structure layer 2, which is configured to be hinged in at least one plane. The section 9 thus forms a flexible shaft section.

[0058] Furthermore, section 9 can comprise a plurality of shaft sections arranged in series between the distal end 3 and the proximal end 4. The plurality of shaft sections is articulated in one plane and includes the through-opening 5. The plurality of shaft sections can be made of a single type of elastically deformable plastic material. Each shaft section can be configured as a swivel element coupled to the adjacent swivel element such that pivoting of the swivel element relative to the adjacent swivel element is provided along a radial axis. Here, the plurality of shaft sections is, by way of example, circular, forming a circular shaft 1. This gives the shaft 1 a constant diameter. However, the shape of the shaft 1 is not limited to this and can also be oval or similar.For example, the shaft 1 and the through-hole 5 can have the same shape but a different diameter or width. Alternatively, the shaft 1 and the through-hole 5 can have different shapes.

[0059] For example, the slot 6 can extend axially, at least section by section, between the proximal end and the distal end in section 9. In particular, the slot 6 can extend axially through the plurality of shaft sections. The plurality of shaft sections arranged in series correspond to an active bending section of the surgical instrument, in particular a flexible endoscopic instrument.

[0060] Furthermore, the slot 6 can form a bay with respect to the axial extent of the inner shaft structure layer 2. For example, the slot 6 forms a bay in each shaft section in section 9. The bay can have the shape of a U, a V, a hammer, a peninsula, or the like. Here, the bay is shaped as a rectangular peninsula by way of example.

[0061] The through-hole 5 is configured to receive the working channel or the optical imaging device, or both. In particular, the through-hole 5 can also be configured to receive two guide wires. The through-hole 5 can extend axially through the plurality of shaft sections. The two guide wires can extend from an operating interface of the flexible endoscopic instrument to articulate the shaft 1, in particular section 9.

[0062] Fig. Figure 3 shows a perspective view of a shaft 1 for a flexible endoscopic instrument according to a further embodiment of the invention.

[0063] The shaft 1 of Fig. 3 essentially comprises the same features as shaft 1 of Fig. 2, however, differs in that the slot 6 here extends, for example, between the distal end 3 and the proximal end 4, i.e., not only in section 9.

[0064] Furthermore, the shape of the bay of slot 6 forms, for example, a V or a V-like peninsula.

[0065] Fig. Figure 4 shows a perspective view of shaft 1 of Fig. 2 or Fig. 3, comprising an outer shaft layer 7 according to a further embodiment of the invention.

[0066] For example, the inner shaft structure layer 2 has an inner surface and an outer surface facing away from the inner surface. The slot 6 can extend radially from the outer surface to the inner surface. Thus, the slot 6 can divide the inner shaft structure layer 2 across its entire thickness.

[0067] The outer shaft layer 7 can be arranged on the outer surface of the inner shaft structure layer 2. Thus, the outer shaft layer 7 can support the inner shaft structure layer. For example, the outer shaft layer 7 can include reinforcing elements (not shown) to strengthen the shaft 1.

[0068] For example, the inner shaft structure layer 2 and the outer shaft layer 7 can be materially bonded to each other. Alternatively or additionally, the inner shaft structure layer 2 and the outer shaft layer 7 can have an interference fit. In particular, the inner shaft structure layer 2 and the outer shaft layer 7 can have an interference fit and be materially bonded to each other.

[0069] Furthermore, the outer shaft layer 7 can comprise a mesh covering, metal, or a liquid crystal polymer. Additionally, the outer shaft layer 7 can be crosslinked with a biocompatible material such as polyurethane, thermoplastic elastomer, or impregnated pellethane. Specifically, the outer shaft layer 7 for shaft 1, except for section 9 (i.e., in the region towards the proximal end 4), can comprise a crosslinked polymer region, and for section 9, a pure polymer region.

[0070] Optionally, the slot 6 can be arranged on two opposite lateral sides of the inner shaft structure layer 2.

[0071] Fig. Figure 5 shows a side view and a front view of a section of two shafts 1, which comprise an intermediate layer 8 and an outer layer 7 according to a further embodiment of the invention. Specifically, the front views located below the side views of the two shafts 1 correspond to the shafts 1 illustrated above in side view.

[0072] The shaft 1 comprises an inner shaft structure layer 2 with a distal end 3 and a proximal end 4. The inner shaft structure layer 2 includes a through-opening 5 for receiving a working channel or an optical imaging device, or both. The through-opening 5 extends axially from the proximal end 4 to the distal end 3.

[0073] The inner shaft structure layer 2 comprises a slot 6 for laterally opening the inner shaft structure layer 2, wherein the slot 6 is arranged at least sectionally between the proximal end 4 and the distal end 3. Optionally, the inner shaft structure layer 2 can be elastically deformable at least in a region of the slot 6.

[0074] For example, the inner shaft structure layer 2 has an inner surface 2a and an outer surface 2b facing away from the inner surface 2a, wherein the slot 6 can extend radially from the outer surface 2b to the inner surface 2a.

[0075] Furthermore, the shaft 1 can comprise the intermediate layer 8, which is arranged radially between the inner shaft structure layer 2 and the outer shaft layer 7. For example, the intermediate layer 8 can be configured as a heat-activated film so that it bonds materially with the inner shaft structure layer 2 and the outer shaft layer 7. This eliminates the need for adhesive rings at the distal end 3, especially when the heat-activated film is applied at the distal end.

[0076] For example, the slot 6 can extend axially, at least section by section, between the proximal end and the distal end in section 9. Furthermore, the slot 6 can form a bay with respect to the axial extent of the inner shaft structure layer 2. The bay can have the shape of a U, a V, a hammer, a peninsula, or the like.

[0077] Both illustrated shafts 1 can have the same features, in particular as described above, except for the slot 6, which may be arranged differently. Furthermore, the slot 6 can form a different shape of the bay when comparing the right shaft 1 with the left shaft 1. Here, the bay of the left shaft 1 is, by way of example, shaped as a rectangular peninsula. The bay of the right shaft 1 is, by way of example, shaped as a V or U.

[0078] Fig. Figure 6 shows a detailed view of a shaft section of shaft 1 of Fig. 2.

[0079] For example, the inner shaft structure layer 2 has an inner surface and an outer surface 2b facing away from the inner surface, wherein the slot 6 can extend radially from the outer surface 2b to the inner surface.

[0080] In Fig. Figure 6 shows that the inner shaft structure layer 2 has, for example, a recess 10 which penetrates the inner shaft structure layer 2 on two sides opposite the slot 6. Thus, any longitudinal body, for example a pin, can be inserted into the recess 10 to secure the slot 6 against opening.

[0081] Furthermore, the slot 6 can form a bay with respect to the axial extent of the inner shaft structure layer 2. In particular, the recess can be arranged in the bay. Optionally, the recess 10 can extend parallel to the through-opening 5. Moreover, the recess 10 can extend through the plurality of shaft sections.

[0082] Fig. Figure 7 shows a sectional view of a shaft 1 according to a further embodiment of the invention.

[0083] Here, the inner shaft structure layer 2 has an inner surface 2a and an outer surface 2b facing away from the inner surface 2a, wherein the slot 6 can extend radially from the outer surface 2b to the inner surface 2a.

[0084] In Fig. Figure 7 shows that the inner shaft structure layer 2 has, for example, a recess 10 that penetrates the inner shaft structure layer 2 on two sides opposite the slot 6. Thus, any longitudinal body, for example a pin, can be inserted into the recess 10 to secure the slot 6 against opening. Alternatively, two steering wires or control wires can be inserted into the recess 10 to articulate a steerable section of the inner shaft structure layer 2.

[0085] Furthermore, the slot 6 can form a mechanical locking mechanism, such as a hook. Optionally, the recess 10 can extend parallel to the through-opening 5. Additionally, the recess 10 can extend through the multiple shaft sections. The inner shaft structure layer 2 can be manufactured by an extrusion process, in particular by extruding two parts. The two parts can be joined by ultrasonic welding.

[0086] Optionally, the inner shaft structure layer 2 can include tunnels 12 for receiving a reinforcing element. In particular, the tunnels 12 and the recesses 10 can be arranged alternately around the circumference of the inner shaft structure layer 2.

[0087] Fig. Figure 8 shows a sectional view of a shaft 1 according to a further embodiment of the invention.

[0088] Here, the inner shaft structure layer 2 has an inner surface 2a and an outer surface 2b facing away from the inner surface 2a, wherein the slot 6 can extend radially from the outer surface 2b to the inner surface 2a.

[0089] In Fig. Figure 8 shows that the inner shaft structure layer 2 has, for example, a recess 10 that penetrates the inner shaft structure layer 2 on two opposite sides with respect to the slot 6. Thus, any longitudinal body, for example a pin, can be inserted into the recess 10 to secure the slot 6 against opening. Alternatively, two steering wires or control wires can be inserted into the recess 10 to articulate a steerable section of the inner shaft structure layer 2.

[0090] Furthermore, the slot 6 can form a mechanical locking mechanism, such as a mushroom-head fastener. Optionally, the recess 10 can extend parallel to the through-opening 5. Additionally, the recess 10 can extend through the multiple shaft sections. The inner shaft structure layer 2 can be manufactured by an extrusion process, in particular by extruding two parts. The two parts can be joined by ultrasonic welding.

[0091] Optionally, the inner shaft structure layer 2 can include tunnels 12 for receiving a reinforcing element. In particular, the tunnels 12 and the recesses 10 can be arranged alternately around the circumference of the inner shaft structure layer 2.

[0092] Fig. Figure 9 shows a schematic flowchart of a method for mounting a working channel and / or an optical imaging device to a shaft 1 for a surgical instrument. The surgical instrument can be, for example, the surgical instrument 100 of Fig. 1 be configured.

[0093] The procedure includes steps of providing S1 a shaft 1, loading S2 a working channel, optionally arranging S3 an intermediate layer 8, optionally arranging S4 an outer shaft layer 7 and optionally heating S5 the outer shaft layer 7.

[0094] In step S1, a shaft 1 is provided, comprising an inner shaft structure layer 2 with a distal end 3 and a proximal end 4. The inner shaft structure layer 2 includes a through-opening 5 for receiving a working channel and / or an optical imaging device. The through-opening 5 extends axially from the proximal end 4 to the distal end 3. Furthermore, the inner shaft structure layer 2 includes a slot 6 for laterally opening the inner shaft structure layer 2, the slot 6 being arranged at least partially between the proximal end 4 and the distal end 3. The inner shaft structure layer 2 can, for example, be based on an extruded profile. That is, the inner shaft structure layer 2 can be manufactured by an extrusion process.

[0095] In loading step S2, the working channel is loaded through slot 6 into the through-opening 5. For example, the working channel can be loaded into the through-opening 5 by pressing open slot 6.

[0096] In the optional step of arranging S3, the intermediate layer 8 can be arranged on the inner shaft structure layer 2 S3 after the working channel S2 has been loaded.

[0097] In the optional assembly step S4, after loading S2 of the working channel, the outer shaft layer 7 can be arranged on the inner shaft structure layer 2. Specifically, the outer shaft layer 7 can be drawn over the inner shaft structure layer 2 or the intermediate layer, if present. Furthermore, the outer shaft layer 7 can be produced, for example, by an extrusion process.

[0098] Furthermore, the step S4 of arranging the outer shaft layer 7 can include expanding the outer shaft layer 7 using compressed air, so that the outer shaft layer 7 is drawn over the inner shaft structure layer 2 or the intermediate layer 8. Thus, when the compressed air is stopped, the outer shaft layer 7 can be compressed, so that the inner shaft structure layer 2 and the outer shaft layer 7 have an interference fit.

[0099] In the optional heating step S5, the outer shaft layer 7 is heated in such a way that it bonds with the inner shaft structure layer 2. For example, heating S5 can be achieved by infrared heating.

[0100] In the detailed description above, various features were combined in one or more examples to provide a more precise illustration. However, it should be clear that the above description is purely descriptive and in no way limiting. It serves to cover all alternatives, modifications, and equivalents of the various features and embodiments. Many further examples are immediately and directly apparent to a person skilled in the art based on their technical knowledge and taking the above description into account.

[0101] The exemplary embodiments were chosen and described to best illustrate the principles underlying the invention and their practical applications. This enables the person skilled in the art to optimally modify and utilize the invention and its various exemplary embodiments with regard to the intended purpose. In the claims and the description, the terms "including" and "comprising" are used as neutral linguistic concepts for the corresponding terms "comprehensive." Furthermore, the use of the terms "a," "an," and "a" is not intended to fundamentally exclude the multitude of elements and components so described.

[0102] Although at least one exemplary embodiment of the present invention(s) is disclosed herein, it is understood that modifications, substitutions, and alternatives may be obvious to a person skilled in the art and can be made without departing from the scope of this disclosure. It is intended that this disclosure covers all adaptations or variations of the exemplary embodiment(s). Furthermore, in this disclosure, the terms "comprise" or "comprising" do not exclude other elements or steps, the terms "one" or "a" do not exclude a plurality, and the term "or" means one or both. Moreover, described features or steps may also be used in combination with other features or steps and in any order, unless the disclosure or the context suggests otherwise.By reference, the complete disclosure of all patents or applications whose advantages or priority are claimed by this disclosure becomes part of the disclosure. REFERENCE MARK LIST 1 shaft 1a steerable section 2 inner shaft structure layer 2a Inner surface 2b Outdoor area 3 distal end 4 proximal end 5 Through opening 6 slots 7 outer shaft layer 8 Intermediate shift 9 Section of the inner shaft structure layer 10 recesses 11 distal end cap 12 tunnels 100 surgical instruments 101 Handpiece 102 Outdoor housings 103 first handwheel 104 second handwheel 105 button 106 control buttons 107 connection 108 light cables 109 Instrument connection S1 Provision S2 Loading S3 Disposal S4 Disposal S5 Heating QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] US 2021 / 153728 A1

[0006]

Claims

A shaft (1) for a surgical instrument (100), in particular for a flexible endoscopic instrument, comprising: an inner shaft structure layer (2) with a distal end (3) and a proximal end (4), wherein the inner shaft structure layer (2) comprises a through-opening (5) for receiving a working channel and / or an optical imaging device, wherein the through-opening (5) extends axially from the proximal end (4) to the distal end (3), and wherein the inner shaft structure layer (2) comprises a slot (6) for laterally opening the inner shaft structure layer (2), wherein the slot (6) is arranged at least sectionally between the proximal end (4) and the distal end (3). Shaft (1) according to claim 1, characterized in that the inner shaft structure layer (2) has an inner surface (2a) and an outer surface (2b) facing away from the inner surface (2a), wherein the slot (6) extends radially from the outer surface (2b) to the inner surface (2a). shaft (1) according to claim 2, further comprising an outer shaft layer (7) arranged on the outer surface (2b) of the inner shaft structure layer (2). Shaft (1) according to claim 3, characterized in that the inner shaft structure layer (2) and the outer shaft layer (7) are materially bonded together. Shaft (1) according to claim 3 or 4, characterized in that the inner shaft structure layer (2) and the outer shaft layer (7) have an interference fit. Shaft (1) according to one of claims 3 to 5, characterized in that the outer shaft layer (7) comprises a mesh covering, metal or a liquid crystal polymer. shaft (1) according to one of claims 3 to 6, further comprising an intermediate layer (8) arranged radially between the inner shaft structure layer (2) and the outer shaft layer (7). Shaft (1) according to one of the preceding claims, characterized in that the slot (6) is arranged in a section (9) of the inner shaft structure layer (2) which is configured to be pivotable in at least one plane. Shaft (1) according to one of the preceding claims, characterized in that the inner shaft structure layer (2) has a recess (10) which penetrates the inner shaft structure layer (2) on two sides opposite each other with respect to the slot (6). Shaft (1) according to one of the preceding claims, characterized in that the slot (6) forms a bay with respect to the axial extent of the inner shaft structure layer (2). shaft (1) according to one of the preceding claims, characterized in that the slot (6) is arranged on two opposite lateral sides of the inner shaft structure layer (2). Surgical instrument (100), in particular a flexible endoscopic instrument, comprising: a shaft (1) according to one of the preceding claims, which is arranged at a distal end of the surgical instrument. Method for mounting a working channel and / or an optical imaging device to a shaft for a surgical instrument, in particular to a shaft (1) according to any one of claims 1 to 11, comprising the steps: providing (S1) a shaft (1) comprising an inner shaft structure layer (2) with a distal end (3) and a proximal end (4), wherein the inner shaft structure layer (2) has a through-opening (5) for receiving a working channel and / or an optical imaging device, wherein the through-opening (5) extends axially from the proximal end (4) to the distal end (3) and wherein the inner shaft structure layer (2) has a slot (6) for laterally opening the inner shaft structure layer (2), wherein the slot (6) is arranged at least sectionally between the proximal end (4) and the distal end (3); and loading (S2) the working channel through the slot (6) into the through-opening (5). The method of claim 13, further comprising the step of arranging (S4) an outer shaft layer (7) on the inner shaft structure layer (2) after the working channel has been loaded (S2). Method according to claim 14, characterized in that the step of arranging (S4) the outer shaft layer includes the expansion of the outer shaft layer (7) by means of compressed air, so that the outer shaft layer (7) is drawn over the inner shaft structure layer (2).

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