Force transmission element, surgical instrument, and method for manufacturing a force transmission element

Abstract

The present invention relates to a force transmission element with combined mechanical support and electrical isolation, a surgical instrument including the force transmission element, and a method for manufacturing the force transmission element, the rod of the force transmission element having at least one recess and an insulating portion extending at least along said recess, the sleeve of the force transmission element having a shaped portion extending at least partially into said recess and configured for engaging a locking element of a surgical instrument.

Description

[Technical Field]

[0001] The present invention relates to a force transmission element with combined mechanical bearing and electrical isolation, as well as to a surgical instrument including the force transmission element and a method for manufacturing the force transmission element. [Background technology]

[0002] Surgical instruments (e.g., surgical instruments) often have mechanical bearings, in particular axial guides with detents or stops. Furthermore, surgical instruments often have electrical isolation (insulation). The mechanical bearings and the electrical isolation are realized by separate components or elements of the surgical instrument.

[0003] For example, a surgical tubular shaft instrument (e.g., an endoscopic instrument) having a tubular shaft and a force transmission element supported within the tubular shaft has a detent that prevents relative rotation (twisting) of the force transmission element with respect to the tubular shaft. Furthermore, such a surgical tubular shaft instrument may additionally or alternatively have an axial guide with a stop that guides the force transmission element axially, preferably centrally, within the tubular shaft and limits the translational movement of the force transmission element using one or two stops.

[0004] Further, for example, a bipolar-actuated surgical tubular shaft instrument (e.g., an endoscopic instrument with a bipolar tool / attachment) has two electrical lines, which are typically formed by two electrically insulated components or elements of the surgical tubular shaft instrument. In a bipolar-actuated surgical tubular shaft instrument, the attachment of the surgical tubular shaft instrument is provided with two electrodes (an active electrode and a neutral electrode). In this case, high-frequency alternating current can be delivered from the first electrode (active electrode) directly to the second electrode (neutral electrode) and into the target tissue.

[0005] In bipolar-operated surgical tubular shaft instruments having a tubular shaft configured as a first electrical line and a force transmission element supported in the tubular shaft and configured as a second electrical line, on the one hand, a detent or axial guide for the force transmission element is provided in the tubular shaft, and on the other hand, a separate electrical isolation or insulation of the force transmission element is provided relative to the tubular shaft, so that additional individual components and connections are arranged in such surgical tubular shaft instruments to achieve both functions, i.e., mechanical guidance and electrical isolation. Summary of the Invention [Problem to be solved by the invention]

[0006] SUMMARY OF THE INVENTION In light of this background, the problem underlying the present invention is to provide an improved medical device with combined mechanical bearing and electrical isolation. [Means for solving the problem]

[0007] This problem is solved according to the invention by an operating element having the features of patent claim 1 and / or by a surgical instrument having the features of patent claim 9 and / or by a method having the features of patent claim 12.

[0008] Accordingly, according to a first aspect of the present invention, there is provided a force transmission element for a surgical instrument comprising a rod, an electrical insulator, and a sleeve. The rod is electrically conductive and configured for force transmission. The electrical insulator extends circumferentially on an outer surface and at least partially axially along the rod. The sleeve is electrically conductive. The sleeve is circumferentially disposed around the electrical insulator and extends at least partially axially along the electrical insulator. The rod has at least one recess. The insulator extends at least along said recess. The sleeve is Embossment and Embossment is at least partially in the recess Engage with, configured to engage a locking element of a surgical instrument.

[0009] According to a second aspect of the present invention, there is provided a surgical instrument, in particular a surgical tubular shaft instrument, comprising a force transmission element according to the first aspect of the present invention, a tubular shaft, a locking element, a tool and an operating interface. The force transmission element is received within the tubular shaft. The locking element is supported within the tubular shaft and is attached to the sleeve of the force transmission element. Embossment The tool is movable using the force transmission element. The manipulation interface is configured to manipulate the force transmission element.

[0010] Furthermore, according to a third aspect of the present invention, there is provided a method for manufacturing a force transmission element for a surgical instrument, in particular a force transmission element according to the first aspect of the present invention, said method comprising the following steps: Providing a conductive rod configured for force transmission and having a recess. Mounting electrical insulation circumferentially on the outer surface and at least partially axially along the rod, whereby the insulation extends at least along said recess. Disposing an electrically conductive sleeve circumferentially around the insulation at least partially axially along the electrical insulation. at least partially engages the recess and is configured to engage a locking element of a surgical instrument. Embossment a step of shaping the sleeve.

[0011] The rod can be at least partially made of a metallic material, such as steel or special steel. The rod can be configured in particular to transmit an axial force (pulling or pushing) and, additionally or alternatively, to transmit a torque. The axial force or torque can be transmitted from the operating interface to the rod and further transmitted via the rod to an accessory or tool of the surgical instrument to move the accessory or tool.

[0012] The recess in the rod is provided to at least one alignment of the rod relative to the sleeve. Shinmata is Turn In this case, the rod is engaged in the recessed area with respect to the sleeve. Embossment The recesses can be produced by cutting methods, such as milling into the rod.

[0013] The insulation can be at least partially made of a polymer material, such as polytetrafluoroethylene (PTFE, Teflon®), or a ceramic material. The insulation electrically separates the conductive rod from the conductive sleeve. In particular, in bipolar operation of a surgical tool, current can be conducted through the force transmission element by electrically connecting one of the two poles to the rod for conducting current and electrically connecting the other of the two poles to a sleeve for conducting current, the sleeve being electrically separated from the rod by an electrical insulation.

[0014] The insulation is arranged circumferentially on the surface of the rod. In this case, the insulation is arranged at least partially along the rod, which extends at least over part of the recess. The insulation contacts the surface of the rod and also contacts the recess or the surface of the rod in the region of the recess. In particular, the insulation is fixedly and mechanically connected to the rod (for example, by interference or press fit). The insulation is therefore attached to the rod so that it circumferentially surrounds the rod at least in the region of the recess. This attachment can be achieved, for example, by coating or shrinking a shrink tube. The insulation can have a substantially constant thickness along the circumference of the rod. Correspondingly, the thickness of the sleeve can be adjusted. Embossment is the Embossment The insulator engages a recess in the rod so that it is in contact with the insulation but not with the rod.

[0015] The sleeve can be at least partially made of a metal material, such as steel or special steel. The sleeve is arranged circumferentially around the rod with the insulating portion, including at least a portion of the recess. The axial bore of the sleeve is particularly arranged concentrically. The sleeve is either fixedly mechanically connected to the rod with the insulating portion (e.g., by an interference fit or press fit) or allows the rod with the insulating portion to slide or rotate relative to the sleeve with a predetermined sliding friction in the bore of the sleeve. In this case, the sleeve is pressed onto the rod and pushed forward so that the sleeve is at least partially arranged in the region of the recess.

[0016] Embossment is the Embossment is formed on the sleeve so as to engage with the recess, Embossment contacts only the insulation around the rod, not the rod itself. Embossment The recess engages with the groove in the radial direction. Embossment and the recess constitute a bearing or guide for the rod relative to the sleeve, wherein the insulating part Embossment and the recess, Embossment The rod is then separated from the recess by at least the area of the recess and the recess. Embossment The sleeve is supported or guided together with the insulation in the region of the sleeve. The sleeve can be shaped, for example, by means of a pressing tool (form element) in a predetermined area around the circumference of the sleeve or by rotary shaping (rotary stamping) over the entire circumference.

[0017] The force transmission element is inserted into the tubular shaft of the surgical instrument. In this case, the force transmission element is supported or guided within the tubular shaft via at least a sleeve. The sleeve can be electrically insulated from the tubular shaft. In particular, the sleeve is supported or guided within the tubular shaft so that the sleeve or the force transmission element can slide axially or rotate relative to the tubular shaft. Thus, the force transmission element can transmit an axial force (pulling or pushing) and, in addition to or instead of that, can transmit a torque within the tubular shaft relative to the tubular shaft.

[0018] To prevent unwanted sliding or relative rotation of the force transmission element relative to the tubular shaft, which may result in, for example, the force transmission element being ejected from the tubular shaft, the sleeve, and therefore the force transmission element, is locked in the tubular shaft via a locking element. Embossment For example, the locking element is supported so as to be movable in the radial direction relative to the tubular shaft, and Embossment In particular, the locking element can be radially preloaded, for example by means of an elastic spring ring.

[0019] The tools, which may in particular be configured in the form of interchangeable accessories, are actuated by axial forces or torques transmitted into and to the tubular shaft via force transmission elements. The tools may be configured as clamps, forceps, tweezers, graspers, scissors, etc. In particular, the tools may also be configured to be bipolar actuated, for example to cut or occlude tissue.

[0020] The manipulation interface is used to manipulate the force transmission element by applying an axial force or torque to the force transmission element.

[0021] If the surgical instrument is to be guided by a user, e.g., a surgeon, the surgical instrument includes a handgrip as an operating part for the user, and the operating interface further transmits the force or torque applied by the user at the handgrip via a suitable operation (e.g., a movable grip leg) to the force transmission element.

[0022] If the surgical instrument is connectable to a given robot, the surgical instrument includes a corresponding connection interface for the robot, at which an axial force or torque can be applied to the force transmission element via the operating interface.

[0023] The force transmission element according to the invention, which comprises a rod, an insulating part and a sleeve, is made by first mounting the insulating part on the rod, then disposing the sleeve on the rod, and finally Embossment The force transmission element according to the present invention is particularly simple to manufacture, since it only needs to be shaped into the region of the recess of the rod. Furthermore, the force transmission element according to the present invention makes it possible to dispense with separate components for guiding and electrically insulating the force transmission element relative to the tubular shaft of the surgical instrument. This advantageously avoids increased production and manufacturing costs due to additional individual components and connections. Furthermore, damage to the corresponding tubular shaft surgical instrument due to mechanical stresses on the normally highly mechanically stressed connection is advantageously avoided.

[0024] Advantageous further configurations and developments of the invention are the subject of the corresponding dependent patent claims.

[0025] According to a further embodiment of the invention, the rod of the force transmission element is configured as a round bar, the electrical insulation extends at least partially in an annular shape along the surface of the rod, and the sleeve is configured as a circular tube and extends at least partially in an annular shape along the surface of the electrical insulation.

[0026] According to a further configuration, the tubular shaft is configured as a circular tube. The rod of the force transmission element is configured as a round bar. The electrical insulation extends at least partially annularly along a surface of the rod. The sleeve is configured as a circular tube and extends at least partially annularly along a surface of the electrical insulation. The force transmission element is arranged concentrically within the tubular shaft.

[0027] A rod configured as a round bar has a substantially circular cross section with a substantially constant diameter along the axial direction, except in the region of the recess.

[0028] The insulating part is arranged annularly and in particular concentrically around the rod, in particular remote from the recess.

[0029] The sleeve, configured as a circular tube, Embossment The sleeve, configured as a circular tube, is arranged annularly and in particular concentrically around the insulation.

[0030] The tubular shaft configured as a circular tube has a substantially circular cross section with a substantially constant diameter along the axial direction, and the force transmission element having the rod configured as a round bar and the sleeve configured as a circular tube is concentrically arranged within the tubular shaft configured as a circular tube, with the locking element being configured to lock the force transmission element having the rod configured as a round bar and the sleeve configured as a circular tube within the tubular shaft configured as a circular tube in the radial direction. Embossment Engage with.

[0031] A force transmission element and a surgical instrument configured in this way can advantageously be manufactured particularly simply.

[0032] In a further configuration, Embossment When the locking element is engaged, the locking element rotates at least about an axis parallel to the sleeve or parallel to the axial direction of the sleeve. Turn It is designed to prevent.

[0033] The locking element of the surgical instrument (hereinafter also referred to as the surgical element) prevents rotation of the sleeve relative to the tubular shaft and, depending on the configuration of the recess, also of the rod. Embossment Therefore, only axial sliding of the sleeve relative to the tubular shaft and, depending on the configuration of the recess, also of the rod is possible.

[0034] Thus, also for tools or accessories of the surgical element, unwanted rotation of the sleeve or the entire force transmission element can be avoided, thereby ensuring the correct functioning of the tool / accessory.

[0035] In a further configuration, Embossment has at least one substantially flat portion for substantially flat contact with the flat surface of the locking element, the substantially flat portion extending parallel to the axial direction of the sleeve and positioned radially inward relative to the outer surface of the sleeve.

[0036] This substantially flat portion can be produced on the rod or bar, for example by plane milling, and forms a flat contact surface which, when contacted by a similarly substantially flat surface of a locking element preloaded radially inwards against the sleeve, preferably in a flat contact, locks the sleeve and, depending on the configuration of the recess, also the rod against rotation / torsion relative to the tubular shaft of the surgical instrument.

[0037] Therefore, Embossment This configuration advantageously allows the detent to be particularly simple to manufacture.

[0038] According to a further feature of the invention, the recess has at least one substantially flat portion parallel to the axial direction of the rod, the substantially flat portion being located further radially inward with respect to the outer surface of the rod, Embossment sandwiched between insulating parts and a substantially flat portion of Arranged facing each otherIt has been do.

[0039] The sleeve, Embossment and a locking element having a substantially flat surface of the operative element, the rod is also locked against rotation or relative rotation (torsion) within the tubular shaft via its substantially flat portion, and Embossment is locked against rotation / relative rotation (torsion) with respect to the tubular shaft via the substantially flat portion of the

[0040] According to a further aspect of the present invention, Embossment When the locking element is engaged, the locking element is at least parallel to the sleeve or parallel to the axial direction of the sleeve. Advance Constructed to restrict or prevent

[0041] The locking element of the operating element is configured to limit or prevent axial sliding of the sleeve relative to the tubular shaft and, depending on the configuration of the recess, also axial sliding of the rod. Embossment In one embodiment, rotation of the sleeve relative to the tubular shaft and, depending on the configuration of the recess, rotation of the rod may also be permitted.

[0042] Thus, unwanted axial sliding of the sleeve or the entire force transmission element relative to the tool or accessory of the surgical element can be avoided, thereby ensuring the correct functioning of the tool / accessory.

[0043] In a further configuration, Embossment has at least one stopper. Embossment At least one of the stoppers is parallel to the sleeve or parallel to the axial direction of the sleeve when the locking element is engaged. Advance Constructed to prevent or restrict.

[0044] If the locking element is axially secured by at least one of its side surfaces EmbossmentWhen the stopper is abutted against the locking element, axial sliding of the sleeve relative to the tubular shaft (in the direction of the stopper towards the locking element) is no longer possible. Embossment If two axially opposite stops are provided in the locking element, the axial movement of the sleeve relative to the tubular shaft is at least limited in both directions of axial movement. If both axially opposite stops are arranged so as to always abut on both lateral sides of the axially oriented locking element, the alignment of the sleeve relative to the tubular shaft is at least limited in both directions of axial movement. Susumu is , is not only restricted but also hindered.

[0045] According to a further development of the invention, the recess has at least one stopper, the at least one stopper of the recess being: Embossment At the same time, at least parallel in the direction parallel to the rod or the axial direction of the rod Advance Constructed to restrict or prevent

[0046] What if Embossment When the stopper of the recess is brought into contact with the stopper of the recess in the axial direction using the at least one stopper, Embossment In the direction towards the stopper, axial sliding of the rod relative to the sleeve is no longer possible. In particular, if two axially opposite stops are provided in the recess, the axial movement of the rod relative to the sleeve is at least limited in both axial movement directions. Embossment If the rod is arranged so that it abuts evenly against both stoppers, the alignment of the rod with respect to the sleeve Susumu is , is not only restricted but also hindered.

[0047] According to a further feature of the invention, the electrical insulation comprises at least Embossment Additionally or alternatively, the sleeve has slip characteristics on its outer surface in the region of at least Embossment In the region of , the inner surface has slip properties.

[0048] The slipperiness or slipperiness of the outer surface of the electrical insulation Embossment The sliding properties of the inner surfaces of the sleeves can be ensured by a suitable choice of material (e.g., PTFE for the electrical insulation) and, additionally or alternatively, by a suitable treatment of the respective surfaces (e.g., polishing, honing, etc.). For example, the electrical insulation can be made of PTFE and the sleeve can be made of stainless steel. Furthermore, the inner surface of the sleeve can be polished. This allows the polished inner surface of the stainless steel sleeve to slide well on the outer surface of the PTFE insulation, thereby allowing axial sliding or rotation of the sleeve relative to the electrical insulation.

[0049] According to a further feature of the invention, the locking element comprises: Embossment Additionally or alternatively, it has slip properties on its surface portion facing towards Embossment has slip properties on its outer surface.

[0050] Embossment The sliding properties of the surface of the locking element facing Embossment The sliding properties of the outer surfaces of the sleeve and the locking element can be ensured by a suitable selection of materials and, additionally or alternatively, by a suitable treatment of the respective surfaces (e.g., grinding, honing, etc.). For example, the sleeve and the locking element may be manufactured from special steel, and the outer surfaces of the sleeve and Embossment The surface of the locking element facing towards the locking element can be polished, so that the polished outer surface of the stainless steel sleeve faces the locking element. Embossment The surface of the locking element made of stainless steel facing in the direction of the arrow A can slide easily on the surface of the locking element made of stainless steel facing in the direction of the arrow B, so that a sliding axial sliding or rotation of the sleeve relative to the locking element or the tubular shaft of the surgical instrument is possible.

[0051] According to a further configuration of the invention, the providing step comprises the step of producing a recess in the rod, in particular by a deformation process, for example by pressing, or by a cutting process, for example by milling or turning.

[0052] According to a further aspect of the invention, the step of applying insulation comprises crimping shrink tubing onto the rod or coating the rod.

[0053] According to a further aspect of the invention, the step of arranging the periphery comprises the steps of: Heating the sleeve until thermal expansion causes the inner diameter of the sleeve to become larger than the outer diameter of the electrical insulation. Pressing the heated sleeve onto the electrical insulation. Cooling the heated and pressed sleeve.

[0054] The heated sleeve is pressed onto the rod with the electrical insulation so that it is at least partially disposed in the region of the recess of the rod, and as soon as the pressed sleeve cools, an interference fit or press fit, i.e., a fixed mechanical connection, or a loose fit, i.e., a sliding connection, is obtained between the sleeve and the electrical insulation.

[0055] The above-mentioned embodiments and further features can be combined with each other in any meaningful way. Further possible embodiments, further features and implementations of the present invention also include combinations not explicitly mentioned based on the features of the present invention described above or below with reference to the examples. In particular, those skilled in the art will also add individual aspects as improvements or supplements to the respective basic features of the present invention.

[0056] The invention will now be explained in more detail on the basis of an embodiment shown in the schematic diagram of the drawing. [Brief explanation of the drawings]

[0057] [Figure 1] FIG. 1 is a side view of a manual surgical instrument. [Figure 2] FIG. 1 is a longitudinal cross-sectional view of a surgical instrument. [Figure 3] 1 is an isometric view of a first embodiment of a force-transmitting element of a surgical instrument. FIG. [Figure 4A] FIG. 1 is a longitudinal section through a first variation of the first embodiment of the force transmission element; [Figure 4B] FIG. 10 is a longitudinal section through a second variation of the first embodiment of the force transmission element. [Figure 4C] FIG. 2 is a cross-sectional view of a first embodiment of a force-transmitting element in the region of an embossment. [Figure 5] FIG. 10 is an isometric view of a second embodiment of a force transmission element. [Figure 6A] FIG. 10 is a longitudinal section through a first variation of the second embodiment of the force transmission element. [Figure 6B] FIG. 10 is a longitudinal section through a second variation of the second embodiment of the force transmission element. [Figure 6C] FIG. 10 is a cross-sectional view of a second embodiment of a force-transmitting element in the region of an embossment. [Figure 7] FIG. 10 is an isometric view of a third embodiment of a force transmission element. [Figure 8A] FIG. 10 is a longitudinal section through a first variation of the third embodiment of the force transmission element. [Figure 8B] FIG. 10 is a longitudinal section through a second variation of the third embodiment of the force transmission element. [Figure 8C] FIG. 10 is a cross-sectional view of a third embodiment of a force-transmitting element in the region of an embossment. [Figure 9] FIG. 10 is an isometric view of a fourth embodiment of a force transmission element. [Figure 10] FIG. 10 is a longitudinal section of a fourth embodiment of a force transmission element. [Figure 11] FIG. 1 shows a flowchart of an embodiment of a method for manufacturing a force-transmitting element. DETAILED DESCRIPTION OF THE INVENTION

[0058] The accompanying figures of the drawings should provide a further understanding of embodiments of the present invention. These figures illustrate embodiments and, in connection with this specification, serve to explain the principles and concepts of the present invention. Other embodiments and many of the advantages discussed above are apparent in light of the drawings. Elements of the drawings are not necessarily shown to scale relative to each other.

[0059] In each of the figures of the drawings, unless otherwise stated, identical, functionally identical, and similarly acting elements, features, and components are labeled with the same reference numerals, respectively.

[0060] 1 is a schematic representation of a manual surgical instrument 10. The surgical instrument 10 includes a force transmission element (not shown here, see FIGS. 2-10), a tubular shaft 11, a locking element (not shown here, see FIG. 2), a tool or accessory 13, a hand grip 14, movable grip legs 15, and an accessory interface 16.

[0061] The force transmission element 1 is received and supported within the tubular shaft 11 (see FIG. 2). A locking element 12 locks the force transmission element 1 against relative rotation (torsion) with respect to the tubular shaft 11 and, additionally or alternatively, against axial sliding (see FIG. 2). The tool 13 is configured as a gripping tool, to which a bipolar current can be supplied via the force transmission element 1. The surgical instrument 10 is provided with a handgrip 14 for manual guidance by a user (e.g., a surgeon). Alternatively, the surgical instrument 10 can be provided with a corresponding connection interface for a robot (not shown) for robotic guidance. Movable gripping legs 15 are used for manual force introduction. The force applied to the gripping legs 15 is transmitted by the gripping legs 15 to the force transmission element 1. The force transmission element 1 also transmits an axial force to the tool / accessory. Additionally, two electrodes of a bipolar generator (not shown) are connected to the tool via the force transmission device 1. Via accessory interface 16, tool / accessory 13 can be removably mechanically connected to hand grip 14.

[0062] FIG. 2 shows a longitudinal section of the surgical instrument 10 of FIG. 1 in the region of the accessory interface 16.

[0063] The force transmission element 1 is received and guided in a tubular shaft 11 configured as a circular tube. In this case, the force transmission element 1 is locked by a locking element 12 guided in the tubular shaft 11. The force transmission element 1 includes a rod 2, an electrical insulator 3, and a sleeve 4.

[0064] The rod 2 is configured as a round bar and is made of special steel. Via the rod 2, for example, an axial force from a movable gripping leg 15 (not shown here, see FIG. 1) can be transmitted to a tool 13 (not shown here, see FIG. 1). Furthermore, one of the two electrodes of a bipolar generator can be connected to the tool 13 via the rod 2. The rod 2 has a recess 5, which can have different shapes (see FIGS. 3 to 10).

[0065] The electrical insulator 3 is made of PTFE (polytetrafluoroethylene) and is arranged circumferentially, here annularly and concentrically, around the rod 2. Its material could also be PFA (perfluoroalkoxyalkane) or a similar material. The electrical insulator 3 is mechanically fixedly connected to the rod 2 and electrically separates the rod 2 from the sleeve 4. The electrical insulator 3 is also arranged around the rod 2 in the region of the recess 5 and is mechanically fixedly connected to the rod 2.

[0066] The sleeve 4 is made of special steel and is arranged annularly and concentrically around the electrical insulation part 3. The sleeve 4 is fitted in the area of the recess 5. Embossment 6, which, over its entire length, is in contact only with the electrical insulator 3, but not with the rod 2. Via the sleeve 4, the other of the two electrodes of the bipolar generator can be connected to the tool 13. Embossment6 has a distal stopper 7A and a proximal stopper 7B.

[0067] The locking element 12 is preloaded towards the force transmission element 1 in a distal direction via a ring spring 17, Embossment 6. At this time, Embossment The face 12A of the locking element 12 facing towards 6 is Embossment 6 is in contact with the outer surface of the Embossment The face 12A of the locking element 12 facing towards 6 can be substantially flat, Embossment The outer surface of 6 may include a substantially flat portion 6A, whereby Embossment The face 12A of the locking element 12 facing the direction of the arrow 6 is substantially flat. Embossment 6, which is in contact with the substantially flat portion 6A of the sleeve 4. Roll The sleeve 4 is therefore locked against rotation / relative rotation (torsion) with respect to the tubular shaft 11 .

[0068] The distal ramp of the locking element 12 is Embossment The alignment of the sleeve 4 in the axial direction together with the stopper 7A on the distal side of the 6 Advance The proximal ramp of the locking element 12 Embossment The alignment of the sleeve 4 in the axial direction together with the stopper 7B on the proximal side of the 6 Advance In FIG. 2, the proximal ramp of the locking element 12 Embossment 1. Sleeve 4 is shown abutting proximal stop 7B of tubular shaft 11, which prevents sleeve 4 from sliding further distally relative to tubular shaft 11.

[0069] How the rod 2 is limited or prevented from translating or rotating relative to the sleeve 4 depends on the respective embodiment of the force transmission element 1. Four different embodiments of the force transmission element 1 will now be described.

[0070] 3, 4A, 4B and 4C a first embodiment of a force transmission element 1 is shown diagrammatically.

[0071] The recess 5 in the rod 2 is annularly circumferential and has a stopper on the distal side of the recess 5 and a stopper on the proximal side of the recess 5. For example, the recess 5 in the rod 2 can be made by turning.

[0072] The electrical insulation 3 contacts the rod 2 annularly and concentrically also in the region of the recess 5 .

[0073] In sleeve 4 Embossment 6 is Embossment 6, a stopper 7A on the distal side of the Embossment 6 and a stopper 7B on the proximal side of the first end 6 are circularly circumferential, and can be formed by rotary shaping (rotary stamping) using one or more rotary rollers, for example.

[0074] 4A shows a schematic longitudinal section of a first variant of the first embodiment of the force-transmitting element 1. The sleeve 4 engages entirely in the recess 5. Embossment 6, where the sleeve 4 abuts the electrical insulator 3. A distal stop 7A of the sleeve 4 abuts a distal stop 8A of the rod 2 or the insulator 3 in this region. Similarly, a proximal stop 7B of the sleeve 4 abuts a proximal stop 8B of the rod 2 or the insulator 3 in this region. This prevents the rod 2 from moving axially relative to the sleeve 4. Depending on the sliding properties between the electrical insulator 3 and the sleeve 4, the rod 2 together with the insulator 3 can be rotated relative to the sleeve 4.

[0075] 4B shows a schematic longitudinal section of a second variant of the first embodiment of the force-transmitting element 1. The sleeve 4 only partially engages in the recess 5. Embossment6, where the sleeve 4 abuts the electrical insulator 3. The distal stop 7A of the sleeve 4 does not abut the distal stop 8A of the rod 2 or the insulator 3 in this region. Similarly, the proximal stop 7B of the sleeve 4 does not abut the proximal stop 8B of the rod 2 or the insulator 3 in this region. As a result, the axial freedom of the rod 2 relative to the sleeve 4 is limited only between the stops, but is not completely prevented. Depending on the sliding properties between the electrical insulator 3 and the sleeve 4, the rod 2 together with the insulator 3 can be rotated relative to the sleeve 4.

[0076] In Figure 4C, Embossment 1 shows a schematic cross section of a first embodiment of a force-transmitting element 1 in the region of 6. Embossment 6 is annular and concentric and is in contact with the electrical insulating portion 3.

[0077] 5, 6A, 6B and 6C a second embodiment of the force transmission element 1 is shown diagrammatically.

[0078] The recess 5 in the rod 2 is annularly circumferential and has a stopper on the distal side of the recess 5 and a stopper on the proximal side of the recess 5. For example, the recess 5 in the rod 2 can be made by turning.

[0079] The electrical insulation 3 contacts the rod 2 annularly and concentrically also in the region of the recess 5 .

[0080] In sleeve 4 Embossment 6 are evenly distributed around the perimeter, here four flat Embossment 6.1, 6.2 (four flat Embossment two of which are not shown), and Embossment 6, a stopper 7A on the distal side of the Embossment 6 and a proximal stopper 7B. Embossment 6.1, 6.2 can be formed by shaping using, for example, one or more pressing tools (mold members).

[0081] 6A shows a schematic longitudinal section of a first variant of the second embodiment of the force-transmitting element 1. The sleeve 4 has four flat recesses 5 which engage across the recesses 5. Embossment 6.1, 6.3 (four flat Embossment The sleeve 4 has a distal stop 7A of the sleeve 4, two of which are not shown, whereby the sleeve 4 abuts the electrical insulator 3. In this region, the distal stop 7A of the sleeve 4 abuts the distal stop 8A of the rod 2 or the insulator 3. Similarly, the proximal stop 7B of the sleeve 4 abuts the proximal stop 8B of the rod 2 or the insulator 3 in this region. This prevents the rod 2 from moving axially relative to the sleeve 4. Depending on the sliding properties between the electrical insulator 3 and the sleeve 4, the rod 2 together with the insulator 3 can rotate relative to the sleeve 4. In this case, it is also possible to prevent rotation.

[0082] In Fig. 6B a longitudinal section of a second variant of the second embodiment of the force transmission element 1 is shown diagrammatically. The sleeve 4 is made up of four flat Embossment 6.1, 6.3 (four flat Embossment two of which are not shown), Embossment 6.1, 6.3 only partially engage in the recess 5, with the sleeve 4 contacting the electrical insulator 3. The distal stop 7A of the sleeve 4 does not contact the distal stop 8A of the rod 2 or the insulator 3 in this region. Similarly, the proximal stop 7B of the sleeve 4 does not contact the proximal stop 8B of the rod 2 or the insulator 3 in this region. As a result, the axial freedom of the rod 2 relative to the sleeve 4 is limited only between these stops, but is not completely prevented. Depending on the sliding properties between the electrical insulator 3 and the sleeve 4, the rod 2 together with the insulator 3 can be rotated relative to the sleeve 4. In this case, it is also possible to prevent rotation.

[0083] Figure 6C shows a flat Embossment A cross section of a second embodiment of the force transmission element 1 is shown diagrammatically in the areas 6.1, 6.2, 6.3 and 6.4. Embossment6.1 to 6.4 are in contact with the electrical insulating portion 3, and can be formed by shaping using, for example, one or more pressing tools (mold members).

[0084] Flat Embossment Engage one of 6.1, 6.2, 6.3, 6.4 and Embossment The locking element, having a flat surface facing towards the shaft, is adapted to lock the sleeve 4 against the tubular shaft 11. Turn but prevents the rotation of the rod 2 relative to the tubular shaft 11. Turn It's not a hindrance.

[0085] 7, 8A, 8B and 8C a third embodiment of the force transmission element 1 is shown diagrammatically.

[0086] Here, the rod 2 comprises four recesses evenly distributed over its circumference, as well as a distal stop of the recesses and a proximal stop of the recesses.

[0087] For example, the recess in the rod 2 can be made by milling.

[0088] The electrical insulation 3 contacts the rod 2 tubularly and concentrically also in the region of the recess.

[0089] In sleeve 4 Embossment 6 are evenly distributed around the perimeter, here four flat Embossment 6.1, 6.2 (four flat Embossment two of which are not shown), and Embossment 6, a stopper 7A on the distal side of the Embossment 6 and a proximal stopper 7B. Embossment 6.1, 6.2 can be formed by shaping using, for example, one or more pressing tools (mold members).

[0090] In Figure 8A a longitudinal section of a first variant of the third embodiment of the force transmission element 1 is shown diagrammatically. The sleeve 4 is made up of four flat Embossment 6.1, 6.3 (four flat EmbossmentTwo of these are not shown. Embossment 6.1, 6.3 each fully engage one of four recesses 5.1, 5.3 (two of the four recesses are not shown), with the sleeve 4 abutting the electrical insulator 3. A distal stop 7A of the sleeve 4 abuts a distal stop 8A of the rod 2 or insulator 3 in this region. Similarly, a proximal stop 7B of the sleeve 4 abuts a proximal stop 8B of the rod 2 or insulator 3 in this region. This prevents axial freedom of the rod 2 relative to the sleeve 4. Depending on the sliding properties between the electrical insulator 3 and the sleeve 4, the rod 2 together with the insulator 3 can be rotated relative to the sleeve 4.

[0091] In Fig. 8B a longitudinal section of a second variant of the third embodiment of the force transmission element 1 is shown diagrammatically. The sleeve 4 is made up of four flat Embossment 6.1, 6.3 (four flat Embossment Two of these are not shown. Embossment 6.1, 6.3 only partially engage with the corresponding recesses 5.1, 5.3 (two of the four recesses are not shown), with the sleeve 4 in contact with the electrical insulator 3. The distal stop 7A of the sleeve 4 does not contact the distal stop 8A of the rod 2 or the insulator 3 in this area. Similarly, the proximal stop 7B of the sleeve 4 does not contact the proximal stop 8B of the rod 2 or the insulator 3 in this area. As a result, the axial freedom of the rod 2 relative to the sleeve 4 is limited only between these stops, but is not completely prevented. Depending on the sliding properties between the electrical insulator 3 and the sleeve 4, the rod 2 together with the insulator 3 can be rotated relative to the sleeve 4.

[0092] In Figure 8C, a flat Embossment A cross section of a third embodiment of the force transmission element 1 is shown diagrammatically in the areas 6.1, 6.2, 6.3 and 6.4. Embossment The flat plates 6.1 to 6.4 are fitted into the recesses 5.1 to 5.4, respectively, and are in contact with the electrical insulating part 3. Embossment The recesses 6.1 to 6.4 can be formed by, for example, shaping using one or more pressing tools (mold members). The recesses 5.1 to 5.4 can be formed by, for example, milling.

[0093] Flat Embossment Engage one of 6.1, 6.2, 6.3, 6.4 and Embossment The locking element, having a flat surface facing towards the shaft, is adapted to lock the sleeve 4 against the tubular shaft 11. Turn To hinder.

[0094] 9 and 10, a fourth embodiment of the force transmission element 1 is shown diagrammatically.

[0095] The recess 5 in the rod 2 is annularly circumferential and has only a proximal stopper. In this case, the recess 5 extends distally at a predetermined angle relative to the axial direction. For example, the recess 5 in the rod 2 can be formed by turning.

[0096] The electrical insulation 3 contacts the rod 2 annularly and concentrically also in the region of the recess 5 .

[0097] In sleeve 4 Embossment 6 is configured to be annular and have only a proximal stop 7B, and can be formed, for example, by rotary shaping (rotary stamping) using one or more rotating rollers, which are inclined at a corresponding angle relative to the axial direction.

[0098] 10 shows a schematic longitudinal section of a fourth embodiment of the force transmission element 1. The sleeve 4 engages entirely in the recess 5. Embossment6, where the sleeve 4 abuts the electrical insulator 3. A proximal stop 7B of the sleeve 4 abuts a proximal stop 8B of the rod 2 or the insulator 3 in this region. This limits the axial freedom of the rod 2 relative to the sleeve 4, at least in the distal direction. Depending on the sliding properties between the electrical insulator 3 and the sleeve 4, the rod 2 together with the insulator 3 can be rotated relative to the sleeve 4.

[0099] Figure 11 shows a schematic representation of an embodiment of a method for manufacturing a force transmission element for a surgical instrument, in particular the force transmission element 1 of Figures 2 to 10. The method comprises the steps of providing S1, attaching S2, arranging S3 and shaping S4.

[0100] In a providing step S1, a conductive rod configured for force transmission and having a recess is provided. The providing step S1 includes a sub-step, which is a making step S1.2.

[0101] In the creation step S1.2, the recess in the rod is created. The recess is created by a deformation process, for example by pressing, or by a cutting process, for example by milling or turning. It is possible to create only one (proximal or distal) stop of the recess, to create an optionally extending (proximal or distal) recess, or to create two stops of the recess (one proximal and one distal stop).

[0102] In the step of attachment S2, an electrical insulator is attached circumferentially, preferably annularly and particularly preferably concentrically, on the outer surface and at least partially axially along the rod, so that the electrical insulator extends at least along the recess. In particular, the attachment step S2 comprises shrinking a shrink tube (e.g. made of PTFE) onto the rod or coating the rod (e.g. with a polymeric or ceramic material).

[0103] In a peripheral arrangement step S3, the electrically conductive sleeve is arranged circumferentially, preferably annularly and particularly preferably concentrically, around the electrical insulation at least partially axially along the electrical insulation, the peripheral arrangement step S3 comprising as sub-steps a heating step S3.1, a pressing step S3.2 and a cooling step S3.3.

[0104] In a heating step S3.1, the sleeve is heated until thermal expansion causes the inner diameter of the sleeve to become larger than the outer diameter of the electrical insulation.

[0105] In a pressing step S3.2, the heated sleeve is pressed onto the electrical insulation, at least until it is positioned (axially) over the recess.

[0106] In a cooling step S3.3, the heated and pressed sleeve is cooled, which can be done, for example, by thermal radiation, or by convection against still or moving ambient air, or by quenching with a cooling medium.

[0107] In step S4 of shaping, a recess is at least partially engaged with the recess and configured to engage a locking element of a surgical instrument. Embossment is shaped relative to the sleeve. Embossment The shaping can be carried out by rotary shaping (rotary stamping) using one or more shaping rollers parallel to the axial direction or inclined to the axial direction, or by shaping using one or more stamping tools (mold members) acting radially on the sleeve. [Explanation of symbols]

[0108] 1 Force transmission element 2 rods 3 Electrical insulation 4 sleeves 5 recess 5.1~5.4 Individual recesses 6 Embossment 6A Substantially flat area 6.1~6.4 Flat Embossment 7A~7B Embossment Stopper 8A~8B Recess stopper 10 Surgical instruments 11 Tubular shaft 12 Rock Elements 12A Embossment Face facing 13 Tools / Accessories 14 Hand Grips 15 Movable grip legs 16 Accessory Interface 17 Ring spring

Claims

1. A force transmission element (1) for a surgical instrument, comprising: a conductive rod (2) configured for force transmission; an electrical insulation (3) extending circumferentially along the rod (2) on its outer surface and at least partially axially; an electrically conductive sleeve (4) circumferentially disposed around the electrical insulating portion (3) and extending axially at least partially along the electrical insulating portion (3); The rod (2) has at least one recess (5), and the insulating part (3) extends at least along the recess (5); the sleeve (4) has an embossment (6) that at least partially engages the recess (5) and is configured for engagement with a locking element (12) of the surgical instrument (10); A force transmission element (1) characterized by:

2. the rod (2) is configured as a round bar, the electrical insulation (3) extends at least partially in an annular shape along the surface of the rod (2), and the sleeve (4) is configured as a circular tube and extends at least partially in an annular shape along the surface of the electrical insulation (3), 2. A force transmission element (1) according to claim 1, characterized in that:

3. the embossment (6) is configured to prevent rotation about an axis parallel to the axial direction of the sleeve (4) when the locking element (12) is engaged; 2. A force transmission element (1) according to claim 1, characterized in that:

4. the embossment (6) has at least one substantially flat portion (6A) for contacting the flat surface (12A) of the locking element (12), the portion (6A) extending parallel to the axial direction of the sleeve (4) and positioned radially inward relative to the outer surface of the sleeve (4); 4. A force transmission element (1) according to claim 3, characterized in that:

5. the recess (5) has at least one substantially flat portion (5A) parallel to the axial direction of the rod (2), the portion (5A) being located further inward in the radial direction with respect to the outer surface of the rod (2) and facing the substantially flat portion (6A) of the embossment (6) across the insulating portion (3); 5. A force transmission element (1) according to claim 4, characterized in that:

6. the embossment (6) is configured to limit or prevent translation in a direction parallel to the sleeve (4) when the locking element (12) is engaged, and the embossment (6) has at least one stop (7A, 7B) for limiting or preventing translation; 2. A force transmission element (1) according to claim 1, characterized in that:

7. the recess (5) has at least one stop (8A, 8B) which, together with the embossment (6), is configured to limit or prevent translation in a direction parallel to the rod (2); 2. A force transmission element (1) according to claim 1, characterized in that:

8. the electrical insulation (3) has sliding properties on its outer surface at least in the area of the embossments (6) and / or the sleeve (4) has sliding properties on its inner surface at least in the area of the embossments (6), 2. A force transmission element (1) according to claim 1, characterized in that:

9. A surgical instrument (10), comprising: A force transmission element (1) according to any one of claims 1 to 8, a tubular shaft (11) in which the force transmission element (1) is received; a locking element (12) supported within the tubular shaft (11) and engaging with the embossment (6) of the sleeve (4) of the force transmission element (1); a tool (13) that is movable with said force transmission element (1); an operating interface configured to operate the force transmission element (1); A surgical instrument (10) characterized by:

10. the rod (2) of the force transmission element (1) is configured as a round bar, the electrical insulation (3) extends at least partially in an annular shape along the surface of the rod (2), the sleeve (4) is configured as a circular tube and extends at least partially in an annular shape along the surface of the electrical insulation (3), and the force transmission element (1) is arranged concentrically within the tubular shaft (11), 10. A surgical instrument (10) according to claim 9, characterized in that:

11. the locking element (12) has sliding properties on its surface facing the embossment (6) and / or the embossment (6) has sliding properties on its outer surface, 10. A surgical instrument (10) according to claim 9, characterized in that:

12. A method for manufacturing a force-transmitting element (1) for a surgical instrument, comprising the following steps: providing (S1) a conductive rod (2) configured for force transmission and having a recess (5); attaching (S2) an electrical insulator (3) circumferentially on the outer surface and at least partially axially along said rod (2), whereby said insulator (3) extends at least along said recess (5); a step (S3) of disposing an electrically conductive sleeve (4) circumferentially around the insulating portion (3) at least partially axially along the insulating portion (3); and forming (S4) an embossment (6) on the sleeve (4) that at least partially engages the recess (5) and is configured for engagement with a locking element (12) of the surgical instrument (10); containing, A method characterized by:

13. the providing step (S1) comprises creating said recess (5) in said rod (2); The method of claim 12, wherein:

14. The step (S2) of attaching the insulating part (3) comprises shrinking a shrink tube onto the rod (2) or coating the rod (2); 14. The method according to claim 12 or 13, characterized in that:

15. The step of arranging the periphery (S3) comprises the following steps: a step (S3.1) of heating the sleeve (4) until the inner diameter of the sleeve (4) becomes larger than the outer diameter of the electrical insulation (3) due to thermal expansion; (S3.2) pressing the heated sleeve (4) onto the electrical insulation (3); and a step (S3.3) of cooling the heated and pressed sleeve; containing, 14. The method according to claim 12 or 13, characterized in that:

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