Operating element, surgical instrument and method for manufacturing an operating instrument

Abstract

The invention relates to a force transmission element having a combined mechanical support and electrical separation, to a surgical instrument comprising the force transmission element and to a method for manufacturing the force transmission element. The shaft of the force transmission element has at least one recess and the insulation extends at least along the recess. The sleeve of the force transmission element has a punched part which extends at least partially into the recess and is configured for engagement with a fixing element of the surgical instrument.

Description

Technical Field

[0001] The present invention relates to a force transmission element having a combined mechanical support and an electrical separator, a surgical instrument including the force transmission element, and a method for manufacturing the force transmission element. Background Technology

[0002] Surgical instruments typically include mechanical supports, particularly anti-torsion sections or axial guides with stops. Furthermore, surgical instruments usually have electrical isolation sections (insulation). The mechanical supports and electrical isolation sections are implemented through separate components or elements of the surgical instrument.

[0003] Surgical spindle instruments (e.g., endoscopic instruments) having a spindle and a force-transmitting element supported therein include, for example, an anti-torsion portion to prevent the force-transmitting element from twisting relative to the spindle. Additionally or alternatively, such surgical spindle instruments may also include an axial guide with stops, which preferably centrally guides the force-transmitting element in the spindle in the axial direction and restricts translational movement of the force-transmitting element by means of one or two stops.

[0004] Bipolar surgical instruments (e.g., endoscopic instruments with bipolar tools / accessories) also include, for example, two conductive parts, which are typically formed by two electrically insulated components or elements of the surgical instrument relative to each other. In bipolar surgical instruments, two electrodes (an active electrode and a neutral electrode) are arranged at the accessory of the surgical instrument. Here, high-frequency alternating current can be introduced directly from the first electrode (active electrode) relative to the second electrode (neutral electrode) into the target tissue.

[0005] In a bipolar surgical spindle instrument having a spindle with a first conductive part and a force-transmitting element supported therein with a second conductive part, an anti-torsion part or axial guide part for the force-transmitting element is provided in the spindle, and a separate electrical separation part or insulating part for the force-transmitting element is provided relative to the spindle. Therefore, in order to achieve both functions (mechanical guidance and electrical separation), additional parts and connecting parts are arranged in such a surgical spindle instrument. Summary of the Invention

[0006] In this context, the object of the present invention is to provide an improved medical device having a combined mechanical support and an electrical separation portion.

[0007] According to the present invention, this objective is achieved by an operating element having the features of the following technical solutions and / or by a surgical instrument having the features of the following technical solutions and / or by a method having the features of the following technical solutions.

[0008] Accordingly, according to a first aspect of the invention, a force-transmitting element for a surgical instrument is provided, comprising a rod, an electrically insulating portion, and a sleeve. The rod is conductive and configured for force transmission. The electrically insulating portion extends circumferentially and at least partially axially along the rod on its outer surface. The sleeve is conductive. The sleeve is arranged circumferentially around the electrically insulating portion and extends at least partially axially along the electrically insulating portion. The rod has at least one recess. The insulating portion extends at least along the recess. The sleeve has a stamped portion that extends at least partially into the recess and is configured for engagement with a fixing element of the surgical instrument.

[0009] Furthermore, according to a second aspect of the invention, a surgical instrument, particularly a surgical spindle instrument, is provided having a force-transmitting element, a spindle, a fixing element, a tool, and an operating interface according to a first aspect of the invention. The force-transmitting element is received in the spindle. The fixing element is supported in the spindle and engages in a stamped portion of the sleeve of the force-transmitting element. The tool is movable by means of the force-transmitting element. The operating interface is configured for operating the force-transmitting element.

[0010] Furthermore, according to a third aspect of the present invention, a method for manufacturing a force-transmitting element for surgical instruments, particularly a force-transmitting element according to a first aspect of the present invention, is provided, the method comprising the following steps:

[0011] Provides an conductive rod constructed for force transmission, which has a recess.

[0012] An electrical insulating portion is applied circumferentially and at least partially along the rod in the axial direction on the outer surface, such that the insulating portion extends at least along the recess.

[0013] A conductive sleeve is arranged around the insulating part and at least partially circumferentially along the electrical insulating part in the axial direction.

[0014] A stamped portion, which is at least partially engaged in the recess and configured to engage with a fixation element of a surgical instrument, is pressed into the sleeve.

[0015] The lever can be made at least partially of a metallic material, such as steel or stainless steel. The lever can be specifically configured to transmit force (tension or compression) in the axial direction and additionally or alternatively, torque. Torque, or force in the axial direction, can be transmitted from the operating interface to the lever and through the lever to an attachment or tool of the surgical instrument to move the attachment or tool.

[0016] The recess in the rod serves to constrain or restrict at least one translational or rotational degree of freedom of the rod relative to the sleeve. Here, the rod is supported relative to the sleeve in the region of the recess and the stamped portion where they engage, and additionally or alternatively guided in the region of the recess and the stamped portion where they engage. The recess can be introduced into the rod by machining methods, such as milling.

[0017] The insulating part can be at least partially made of a polymer material such as polytetrafluoroethylene (PTFE, Teflon) or a ceramic material. The insulating part electrically isolates the conductive rod from the conductive sleeve. Especially in the bipolar operation of surgical instruments, current can be conducted via a force-transmitting element by electrically connecting one of the two poles that conduct current using the rod to the other of the two poles that conduct current using the sleeve, which is electrically isolated from the rod by the electrically insulating part.

[0018] An insulating portion is circumferentially arranged on the surface of the rod. The insulating portion extends along the rod in a section that is at least part of the recess. The insulating portion touches the surface of the rod and also contacts the surface of the recess or the rod in the region of the recess. In particular, the insulating portion is firmly mechanically (e.g., with an interference fit) connected to the rod. Therefore, the insulating portion is applied to the rod such that it circumferentially surrounds the rod, at least in the region of the recess. This application can be achieved, for example, by coating or the shrinkage of a heat-shrink tube. The insulating portion may have a substantially constant thickness along the circumference of the rod. Correspondingly, a stamped portion of the sleeve is engaged in the recess of the rod in such a way that the stamped portion contacts the insulating portion but not the rod.

[0019] The sleeve may be at least partially made of a metallic material, such as steel or stainless steel. The sleeve is circumferentially arranged in a region surrounding the insulating rod, which includes at least one section with a recess. The bores of the sleeve are arranged particularly concentrically in the axial direction. The sleeve is securely mechanically (e.g., with an interference fit) connected to the insulating part or allows for displacement or rotation of the rod with the insulating part relative to the sleeve, the sleeve having a predetermined sliding friction (e.g., with a clearance fit) within its bore. For this purpose, the sleeve is pushed onto the rod and pushed forward such that it is at least partially positioned in the region of the recess.

[0020] The stamped portion is pressed into the sleeve in such a way that it engages with the recess, wherein the stamped portion only contacts the insulating portion surrounding the rod and does not contact the rod itself. Specifically, the stamped portion engages with the recess in the radial direction. The stamped portion and the recess here form a support or guide for the rod relative to the sleeve, wherein the insulating portion contacts both and separates them from each other. Thus, the rod, together with the insulating portion, is supported or guided in the sleeve, at least in the region of the recess and the stamped portion engaged therein. For example, the pressing into the sleeve can be achieved by a die or by rolling in a predefined circumferential section of the sleeve.

[0021] A force-transmitting element is pushed into the tube of a surgical instrument. Here, the force-transmitting element is supported or guided within the tube at least via a sleeve. The sleeve may be electrically insulated relative to the tube. The sleeve is supported or guided within the tube in such a way that the sleeve or force-transmitting element can be axially displaced or rotated relative to the tube. Therefore, the force-transmitting element can transmit axial force (tension or compression) within and relative to the tube and additionally or alternatively, transmit torque within and relative to the tube.

[0022] To prevent undesirable displacement or torsion of the force-transmitting element relative to the tube shaft, which could cause the force-transmitting element to slip out of the tube shaft, the sleeve in the tube shaft, and consequently the force-transmitting element, are secured by a fixing element. For this purpose, the fixing element supported in the tube shaft engages in a stamped portion of the sleeve. The fixing element can, for example, be supported in a manner movable relative to the tube shaft in the radial direction and engaged in the stamped portion in the radial direction. The fixing element can, in particular, be pre-tensioned in the radial direction, for example, by means of an elastic spring coil.

[0023] Tools, especially those constructed as replaceable attachments, are moved by axial force or torque transmitted within and relative to the shaft via a force-transmitting element. Tools can be constructed as clamps, pliers, forceps, grippers, scissors, etc. Furthermore, tools can be particularly constructed to operate bipolarly for purposes such as cutting or shrinking tissue. wait.

[0024] The operating interface is used to operate the force transmission element in such a way that axial force or torque is applied to the force transmission element.

[0025] If a surgical instrument is to be guided by a user, such as a surgeon, the surgical instrument includes a handle as a control part for the user. The operating interface then transmits the force or torque applied by the user through appropriate operation at the handle (e.g., a movable handle grip) to a force transmission element.

[0026] If the surgical instrument is connectable to the robot, the surgical instrument includes a corresponding connection interface for the robot, which can apply axial force or torque to the force transmission element via an operating interface.

[0027] The force-transmitting element according to the invention, comprising a rod, an insulating portion, and a sleeve, can be manufactured in a particularly easy manner, as it only requires applying the insulating portion to the rod, then arranging the sleeve thereon, and finally pressing the stamped portion into the recessed area of ​​the rod. Furthermore, the force-transmitting element according to the invention eliminates the need for separate components for guiding and electrically insulating the force-transmitting element relative to the spindle of the surgical instrument. This advantageously avoids increased production and manufacturing costs due to additional parts and connections. Moreover, it advantageously avoids failures of the surgical spindle instruments involved due to the typically high mechanical stresses required by the aforementioned connections.

[0028] Advantageous improvements and designs of the present invention are the subject of the following corresponding technical solutions.

[0029] According to an improved embodiment of the invention, the rod of the force-transmitting element is constructed as a circular rod. An electrically insulating portion extends at least partially circumferentially along the surface of the rod. The sleeve is constructed as a circular tube and extends at least partially circumferentially along the surface of the electrically insulating portion.

[0030] According to other improvements, the tube shaft is constructed as a circular tube. The rod of the force transmission element is constructed as a circular rod. The electrical insulation portion extends at least partially around the circumference along the surface of the rod. The sleeve is constructed as a circular tube and extends at least partially around the circumference along the surface of the electrical insulation portion. The force transmission elements are concentrically arranged in the tube shaft.

[0031] A rod constructed as a round bar has a substantially circular cross section and a substantially constant diameter along the axial direction, except for the recessed area.

[0032] The insulating portion is arranged around the rod in a circumferential and especially concentric manner, particularly away from the recess.

[0033] The sleeve, constructed as a circular tube, has a substantially circular cross-section and a substantially constant diameter along the axial direction, except for the stamped area. The sleeve, constructed as a circular tube, is arranged around the insulation in a circumferential and, in particular, concentric manner.

[0034] The tube shaft, constructed as a circular tube, has a substantially circular cross-section and a substantially constant diameter along the axial direction. Force-transmitting elements, comprising a rod constructed as a circular bar and a sleeve constructed as a circular tube, are concentrically arranged within the tube shaft. A fixing element is radially engaged with a stamping portion to secure the force-transmitting elements, comprising the rod constructed as a circular bar and the sleeve constructed as a circular tube, within the tube shaft.

[0035] Advantageously, force transmission elements and surgical instruments with such a structure can be manufactured in a particularly easy manner.

[0036] According to an improved embodiment, the stamping portion is configured to at least restrict rotational freedom about an axis parallel to the axial direction of the sleeve or sleeve when engaging the fixing element.

[0037] The retaining element of the surgical component is engaged in the stamping section in such a way that it prevents rotation of the sleeve relative to the tube axis and, according to the design of the recess, also prevents rotation of the rod relative to the tube axis. Therefore, a maximum axial displacement of the sleeve relative to the tube axis and, according to the design of the recess, a maximum axial displacement of the rod relative to the tube axis is permitted.

[0038] Therefore, unwanted rotation of the sleeve or the entire force transmission element relative to the surgical tool or accessory can be avoided, thereby ensuring the proper functioning of the tool / accessory.

[0039] According to one improvement, the stamped portion has at least one substantially flat section for contacting the flat surface of the fixing element in a substantially flat abutting manner. The substantially flat section extends parallel to the axial direction of the sleeve and is located further inward in the radial direction relative to the outer surface of the sleeve.

[0040] For example, a substantially flat section in a rod or round bar can be created by face milling. This substantially flat section forms a flat contact surface. If this section contacts, preferably in a flat manner, the same substantially flat surface of a retaining element (which is pre-tightened inwards against the sleeve in the radial direction), rotation / torsion of the sleeve and, according to the design of the recess, of the rod relative to the tube axis of the surgical instrument is prevented.

[0041] Therefore, this design of the stamping section enables the anti-torsion section to be manufactured in a particularly easy manner.

[0042] According to an improved embodiment of the invention, the recess has at least one substantially flat section parallel to the axial direction of the rod. The substantially flat section is located further inward in the radial direction relative to the outer surface of the rod and contacts the substantially flat section of the stamped portion in a manner that is abutting each other, especially in a flat abutting manner.

[0043] If the sleeve is secured via a substantially flat section of the stamping portion and a fixing element with a substantially flat surface of the surgical element to prevent rotation or torsion in the tube shaft, then the rod is also secured via its substantially flat section and via a substantially flat section of the stamping portion to prevent rotation / torsion relative to the tube shaft.

[0044] According to an improved embodiment of the invention, the stamping portion is configured to at least restrict or prohibit translational freedom in a direction parallel to the axial direction of the sleeve or sleeve when engaging the fixing element.

[0045] The fixing element of the surgical element is engaged in the stamping section in such a way that it restricts or prevents axial displacement of the sleeve relative to the tube shaft and, according to the design of the recess, restricts or prevents axial displacement of the rod relative to the tube shaft. In one embodiment, rotation of the sleeve relative to the tube shaft and rotation of the rod relative to the tube shaft can be achieved according to the design of the recess.

[0046] Therefore, unwanted rotation of the sleeve or the entire force transmission element relative to the surgical tool or accessory can be avoided, thereby ensuring the proper functioning of the tool / accessory.

[0047] According to an improvement, the stamping portion has one less stop. At least one stop of the stamping portion is configured to at least prohibit or limit translational freedom in the direction parallel to the axial direction of the sleeve or sleeve when engaging the fixing element.

[0048] When the fixing element abuts against the stop of the stamping part in the axial direction with at least one side therein, the sleeve can no longer be axially displaced relative to the tube axis (in the direction with the stop towards the fixing element). In particular, when two axially opposed stops of the stamping part are provided, the axial movement of the sleeve relative to the tube axis is restricted in at least two axial movement directions. If the two axially opposed stops are arranged such that they always abut against the two axially oriented sides of the fixing element, the translational freedom of the sleeve relative to the tube axis is not only restricted but also prevented.

[0049] According to an improved embodiment of the invention, the recess has at least one stop. The at least one stop of the recess is configured, together with the stamping portion, to at least restrict or prohibit translational freedom in a direction parallel to the rod or in a direction parallel to the axial direction of the rod.

[0050] When the stamping part abuts against the stop of the recess in the axial direction with at least one of its stops, the rod can no longer be axially displaced relative to the sleeve in the direction from the stop of the recess towards the stop of the stamping part. In particular, when two axially opposed stops of the recess are provided, the axial movement of the rod relative to the sleeve is restricted in at least two axial movement directions. If the two axially opposed stops of the recess are arranged such that they also abut against the two stops of the stamping part, not only is the translational freedom of the rod relative to the sleeve restricted, but it is prevented.

[0051] According to an improved embodiment of the invention, the electrically insulating portion has sliding properties on its outer surface, at least in the region of the stamped portion. Additionally or alternatively, the sleeve has sliding properties on its inner surface, at least in the region of the stamped portion.

[0052] The sliding properties of the outer surface of the electrical insulation part or the inner surface of the stamped part can be ensured by appropriately selecting materials (e.g., PTFE for the electrical insulation part) and additionally or alternatively by appropriately treating the corresponding surfaces (e.g., polishing, honing, etc.). The electrical insulation part can be made of PTFE, for example, and the sleeve can be made of stainless steel. The inner surface of the sleeve can also be polished. The polished inner surface of the stainless steel sleeve can then slide well on the outer surface of the PTFE insulation part, allowing the sleeve to slide axially or rotate relative to the electrical insulation part.

[0053] According to an improved embodiment of the invention, the fixing element has sliding properties on its surface facing the stamping portion. Alternatively or additionally, the stamping portion has sliding properties on its outer surface.

[0054] The sliding properties of the surface of the retaining element facing the stamping portion or the outer surface of the stamping portion can be ensured by appropriately selecting materials and, additionally or alternatively, by appropriately treating the corresponding surfaces (e.g., polishing, honing, etc.). The sleeve and retaining element can, for example, be made of stainless steel, and the outer surface of the sleeve and the surface of the retaining element facing the stamping portion can be polished. The polished outer surface of the stainless steel sleeve can then slide well on the surface of the stainless steel retaining element facing the stamping portion, allowing the sleeve to slide axially or rotate relative to the retaining element or tube shaft of the surgical instrument.

[0055] According to an improved embodiment of the invention, the provided steps include creating a recess in the rod, particularly by forming, for example, pressing, or by cutting, for example, milling or turning.

[0056] According to an improved embodiment of the invention, the step of applying insulation includes shrinking the heat shrink tubing onto the rod or coating the rod.

[0057] According to an improved embodiment of the present invention, the step of circumferential arrangement includes the following steps:

[0058] The sleeve is heated until its inner diameter, due to thermal expansion, exceeds the outer diameter of the electrical insulation part.

[0059] The heated sleeve is pushed onto the electrically insulating part.

[0060] The heated and pushed sleeve is cooled.

[0061] The heated sleeve is pushed onto the rod having an electrically insulating part until it is at least partially positioned in the area of ​​the rod's recess. Once the pushed sleeve has cooled, an interference fit, i.e., a strong mechanical connection, or a clearance fit, i.e., a sliding connection, is created between the sleeve and the electrically insulating part.

[0062] Where meaningful, the above-described design and improvement schemes can be combined arbitrarily with each other. Other possible design, improvement, and implementation schemes of the present invention include combinations of features not explicitly mentioned herein or subsequently described with reference to embodiments of the present invention. In particular, those skilled in the art can further supplement various aspects as improvements or supplements to the various basic forms of the present invention. Attached Figure Description

[0063] The invention will now be explained in more detail with reference to embodiments shown in the schematic illustrations in the accompanying drawings. In the drawings:

[0064] Figure 1 A side view of a handheld surgical instrument is shown;

[0065] Figure 2 A longitudinal sectional view of the surgical instruments is shown;

[0066] Figure 3 An isometric view of a first embodiment of a force transmission element of a surgical instrument is shown;

[0067] Figure 4A A longitudinal sectional view of a first variant of a first embodiment of the force transmission element is shown;

[0068] Figure 4B A longitudinal sectional view of a second variant of the first embodiment of the force transmission element is shown;

[0069] Figure 4C A transverse cross-sectional view of the first embodiment of the force transmission element in the region of the stamping section is shown;

[0070] Figure 5 An isometric view of a second embodiment of the force transmission element is shown;

[0071] Figure 6A A longitudinal sectional view of a first variant of the second embodiment of the force transmission element is shown;

[0072] Figure 6B A longitudinal sectional view of a second variant of the second embodiment of the force transmission element is shown;

[0073] Figure 6C A transverse cross-sectional view of the second embodiment of the force transmission element in the region of the stamping section is shown;

[0074] Figure 7 An isometric view of a third embodiment of the force transmission element is shown;

[0075] Figure 8AA longitudinal sectional view of a first variant of a third embodiment of the force transmission element is shown;

[0076] Figure 8B A longitudinal sectional view of a second variant of the third embodiment of the force transmission element is shown;

[0077] Figure 8C A cross-sectional view of the third embodiment of the force transmission element in the stamping region is shown;

[0078] Figure 9 An isometric view of a fourth embodiment of the force transmission element is shown;

[0079] Figure 10 A longitudinal sectional view of a fourth embodiment of the force transmission element is shown; and

[0080] Figure 11 A flowchart illustrating one embodiment of a method for manufacturing a force transmission element is shown.

[0081] The illustrations in the accompanying drawings are intended to provide a further understanding of embodiments of the invention. They illustrate embodiments and serve to explain the principles and concepts of the invention in conjunction with the description. Other embodiments and the many advantages mentioned can be derived by referring to the drawings. Elements in the drawings are not necessarily shown to scale.

[0082] In the accompanying drawings, unless otherwise specified, the same elements, features and components that are identical in function and action are given the same reference numerals. Detailed Implementation

[0083] exist Figure 1 A handheld surgical instrument 10 is schematically shown. The surgical instrument includes a force transmission element (not shown here, see [link]). Figures 2 to 10 ), tube shaft 11, fixing element (not shown here, see Figure 2 ), tools or accessories 13, handle 14, movable handle grip 15, and accessory interface 16.

[0084] The force transmission element is received and supported in the tube shaft 11 (see Figure 2 The fixing element secures the force transmission element to prevent torsion relative to the tube shaft 11 and additionally or alternatively prevents axial displacement relative to the tube shaft 11 (see...). Figure 2Tool 13 is configured as a gripper that can be supplied with bipolar current via a force transmission element. The surgical instrument is equipped with a handle 14 for manual guidance by a user (e.g., a surgeon). Alternatively, the surgical instrument 10 may be equipped with a corresponding connector (not shown) for robot guidance. A movable handle grip 15 is used for manually applying force. The force applied to the handle grip 15 is transmitted to the force transmission element. The force transmission element then transmits the axial force to the tool / accessory. Additionally, the two electrode portions (not shown) of the bipolar generator are connected to the tool via the force transmission element. Tool / accessory 13 can be detachably mechanically connected to handle 14 via accessory interface 16.

[0085] exist Figure 2 The diagram illustrates Figure 1 A longitudinal sectional view of the surgical instrument 10 in the area of ​​the accessory interface 16.

[0086] The force transmission element 1 is received and guided within a tube shaft 11, which is constructed as a circular tube. The force transmission element 1 is secured here by a fixing element 12 guided within the tube shaft 11. The force transmission element 1 includes a rod 2, an electrical insulating part 3, and a sleeve 4.

[0087] Rod 2 is implemented as a round rod and is made of stainless steel. Axial force can be applied via rod 2, for example from a movable handle grip (not shown here, see...). Figure 1 Transferred to the tool (not shown here, see...) Figure 1 Furthermore, one of the two electrode sections of the bipolar generator can be connected to the tool via rod 2. Rod 2 has a recess 5. Recess 5 can have different shapes (see...). Figures 3 to 10 ).

[0088] The electrical insulation part 3 is made of PTFE and is arranged circumferentially, concentrically around the rod. The material can also be PFA or a similar material. The electrical insulation part 3 is securely mechanically connected to the rod 2 and electrically isolates the rod 2 from the sleeve 4. The electrical insulation part 3 is also arranged around the rod 2 in the region of the recess 5 and is securely mechanically connected to the rod.

[0089] The sleeve 4 is made of stainless steel and is arranged circumferentially, specifically concentrically around the electrical insulation part 3. The sleeve 4 has a stamped portion 6 in the region of the recess 5, which engages within the recess 5. The sleeve 4 contacts the electrical insulation part 3 only along its entire length and not the rod 2. The other of the two electrode portions of the bipolar generator can be connected to a tool via the sleeve 4. The stamped portion 6 has a distal stop 7A and a proximal stop 7B.

[0090] The retaining element 12 is pre-tensioned and engaged in the stamping portion 6 via a ring spring 17 toward the distal direction of the force transmitting element 1. The face 12A of the retaining element 12 facing the stamping portion rests against the outer surface of the stamping portion 6. The face 12A of the retaining element 12 facing the stamping portion may be substantially flat, and the outer surface of the stamping portion 6 may include a substantially flat section 6A, so that the face 12A of the retaining element 12 rests substantially flat against the substantially flat section 6A of the stamping portion 6. This restricts rotational freedom about the longitudinal axis of the sleeve and thus fixes the sleeve 4 relative to the tube shaft 11 to prevent rotation / torsion.

[0091] The distal side of the fixing element 12, together with the distal stop 7A of the stamping part 6, restricts the translational freedom of the sleeve in the axial direction. The proximal side of the fixing element 12, together with the proximal stop 7B of the stamping part 6, restricts the translational freedom of the sleeve in the axial direction. Figure 2 As shown, the proximal side of the fixing element 12 abuts against the proximal stop 7B of the stamping part 6. Therefore, the sleeve 4 cannot be displaced further distally relative to the tube shaft 11.

[0092] The extent to which the translation or rotation of rod 2 relative to sleeve 4 is constrained or prevented depends on the corresponding implementation of force transmission element 1. Four different implementations of force transmission element 1 are described below.

[0093] exist Figure 3 , Figure 4A , Figure 4B and Figure 4C The first embodiment of the force transmission element 1 is schematically shown in the figure.

[0094] The recess 5 in the rod 2 is circumferentially surrounded and also has a distal stop and a proximal stop of the stamped portion 5. For example, the recess 5 in the rod 2 can be created by turning.

[0095] The electrical insulating part 3 also abuts against the rod 2 in a circumferential and concentric manner in the area of ​​the recess 5.

[0096] The stamping portion 6 in the sleeve 4 is surrounded by the distal stop portion 7A and the proximal stop portion 7B of the stamping portion 6 in a circumferential manner, and can be formed, for example, by rolling using one or more rotating rollers.

[0097] exist Figure 4AThe diagram schematically shows a longitudinal sectional view of a first variant of a first embodiment of the force transmission element 1. The sleeve 4 has a stamped portion 6 that engages within the entire recess 5, wherein the sleeve 4 abuts against the electrically insulating portion 3. The distal stop 7A of the sleeve 4 abuts against the distal stop 8A of the rod 2 or the insulating portion 3 in this region. Similarly, the proximal stop 7B of the sleeve 4 abuts against the proximal stop 8B of the rod 2 or the insulating portion 3 in this region. Therefore, the axial freedom of the rod 2 relative to the sleeve 4 is restricted. The rod 2, together with the insulating portion 3, can rotate relative to the sleeve 4 according to the sliding characteristics between the electrically insulating portion 3 and the sleeve 4.

[0098] exist Figure 4B The diagram schematically shows a longitudinal sectional view of a second variant of the first embodiment of the force transmission element 1. The sleeve 4 has a stamped portion 6 that engages only in a section of the recess 5, where the sleeve 4 rests against the electrical insulation portion 3. The distal stop portion 7A of the sleeve 4 does not rest against the distal stop portion 8A of the rod 2 or the insulation portion 3 in this region. Similarly, the proximal stop portion 7B of the sleeve 4 does not rest against the proximal stop portion 8B of the rod 2 or the insulation portion 3 in this region. Therefore, the axial degree of freedom of the rod 2 relative to the sleeve 4 is limited only between the stops, but not completely prevented. The rod 2, together with the insulation portion 3, can rotate relative to the sleeve 4 according to the sliding characteristics between the electrical insulation portion 3 and the sleeve 4.

[0099] exist Figure 4C The diagram schematically shows a transverse cross-sectional view of the force transmission element 1 in the region of the stamping portion 6 in the first embodiment. The stamping portion 6 is attached to the electrical insulation portion 3 in a circumferential and concentric manner.

[0100] Figure 5 , Figure 6A , Figure 6B and Figure 6C The second embodiment of the force transmission element 1 is schematically shown in the figure.

[0101] The recess 5 in the rod 2 is circumferentially surrounded and has a distal stop and a proximal stop. For example, the recess 5 in the rod 2 can be created by turning.

[0102] The electrical insulating part 3 also abuts against the rod 2 in a circumferential and concentric manner in the area of ​​the recess 5.

[0103] The stamped portion 6 in the sleeve 4 includes four flat stamped portions 6.1, 6.2 (two of the four flat stamped portions are not shown) evenly distributed in the circumferential direction, as well as a distal stop portion 7A and a proximal stop portion 7B of the stamped portion 6. The flat stamped portions 6.1, 6.2 can be formed, for example, by stamping using one or more dies.

[0104] exist Figure 6A The diagram schematically shows a longitudinal sectional view of a first variant of the second embodiment of the force transmission element 1. The sleeve 4 has four flat stamped portions 6.1, 6.3 (two of the four flat stamped portions are not shown), which engage within the entire recess 5, with the sleeve 4 abutting against the electrical insulation portion 3. The distal stop portion 7A of the sleeve 4 abuts against the distal stop portion 8A of the rod 2 or the insulation portion 3 in this region. Similarly, the proximal stop portion 7B of the sleeve 4 abuts against the proximal stop portion 8B of the rod 2 or the insulation portion 3 in this region. Therefore, the axial freedom of the rod 2 relative to the sleeve 4 is restricted. The rod 2, together with the insulation portion 3, can rotate relative to the sleeve 4 according to the sliding characteristics between the electrical insulation portion 3 and the sleeve 4. Rotation can also be prevented.

[0105] exist Figure 6B The diagram schematically shows a longitudinal sectional view of a second variant of the second embodiment of the force transmission element 1. The sleeve 4 has four flat stamped portions 6.1, 6.3 (two of the four flat stamped portions are not shown), which engage only in one section of the recess 5, where the sleeve 4 rests against the electrical insulation portion 3. The distal stop portion 7A of the sleeve 4 does not rest against the distal stop portion 8A of the rod 2 or the insulation portion 3 in this region. Similarly, the proximal stop portion 7B of the sleeve 4 does not rest against the proximal stop portion 8B of the rod 2 or the insulation portion 3 in this region. Therefore, the axial degree of freedom of the rod 2 relative to the sleeve 4 is limited but not completely prevented only between the stops. The rod 2, together with the insulation portion 3, can rotate relative to the sleeve 4 according to the sliding characteristics between the electrical insulation portion 3 and the sleeve 4. Rotation can also be prevented.

[0106] exist Figure 6C The diagram schematically shows a transverse cross-sectional view of the second embodiment of the force transmission element 1 in the region of the flat stamped portions 6.1, 6.2, 6.3, and 6.4. The flat stamped portions 6.1 to 6.4 are attached to the electrically insulating portion 3 and can be formed, for example, by stamping using one or more dies.

[0107] A fixing element that engages with one of the flat stamping portions 6.1, 6.2, 6.3, and 6.4 with a flat surface facing the stamping portion prevents the sleeve 4 from rotating relative to the tube shaft, but does not prevent the rod 2 from rotating relative to the tube shaft.

[0108] exist Figure 7 , Figure 8A , Figure 8B and Figure 8C The third embodiment of the force transmission element 1 is schematically shown in the figure.

[0109] The rod 2 here includes four recesses evenly distributed in the circumferential direction, as well as distal stops and proximal stops of the recesses. The recesses in the rod 2 can be created, for example, by milling.

[0110] The electrical insulation part 3 also abuts against the rod 2 in a circumferential and concentric manner in the area of ​​the recess.

[0111] The stamped portion 6 in the sleeve 4 includes four flat stamped portions 6.1, 6.2 (two of the four flat stamped portions are not shown) evenly distributed in the circumferential direction, as well as a distal stop portion 7A and a proximal stop portion 7B of the stamped portion 6. The flat stamped portions 6.1, 6.2 can be formed, for example, by stamping using one or more dies.

[0112] exist Figure 8A The diagram schematically shows a longitudinal sectional view of a first variant of the third embodiment of the force transmission element 1. The sleeve 4 has four flat stamped portions 6.1, 6.3 (two of the four flat stamped portions are not shown), which are entirely engaged with one of four recesses 5.1, 5.3 (two of the four recesses are not shown), wherein the sleeve 4 abuts against the electrical insulation portion 3. The distal stop 7A of the sleeve 4 abuts against the distal stop 8A of the rod 2 or the insulation portion 3 in this region. Similarly, the proximal stop 7B of the sleeve 4 abuts against the proximal stop 8B of the rod 2 or the insulation portion 3 in this region. Therefore, the axial freedom of the rod 2 relative to the sleeve 4 is restricted. The rod 2, together with the insulation portion 3, can rotate relative to the sleeve 4 according to the sliding characteristics between the electrical insulation portion 3 and the sleeve 4.

[0113] exist Figure 8B The diagram schematically shows a longitudinal sectional view of a second variant of the third embodiment of the force transmission element 1. The sleeve 4 has four flat stamped portions 6.1, 6.3 (two of the four flat stamped portions are not shown), which engage only in one section of the corresponding recesses 5.1, 5.3 (two of the four recesses are not shown), wherein the sleeve 4 abuts against the electrical insulation portion 3. The distal stop portion 7A of the sleeve 4 does not abut against the distal stop portion 8A of the rod 2 or the insulation portion 3 in this region. Similarly, the proximal stop portion 7B of the sleeve 4 does not abut against the proximal stop portion 8B of the rod 2 or the insulation portion 3 in this region. Therefore, the axial freedom of the rod 2 relative to the sleeve 4 is limited but not completely prevented only between the stops. The rod 2, together with the insulation portion 3, can rotate relative to the sleeve 4 according to the sliding characteristics between the electrical insulation portion 3 and the sleeve 4.

[0114] exist Figure 8CThe diagram schematically shows a transverse sectional view of the second embodiment of the force transmission element 1 in the region of the flat stamped portions 6.1, 6.2, 6.3, and 6.4. The flat stamped portions 6.1 to 6.4 engage with corresponding recesses 5.1 to 5.4 and abut against the electrically insulating portion 3. The flat stamped portions 6.1 to 6.4 can be formed, for example, by stamping using one or more dies. The recesses can be formed, for example, by milling.

[0115] A fixing element that engages with one of the flat stamping portions 6.1, 6.2, 6.3, and 6.4 with a flat surface facing the stamping portion prevents the sleeve 4 from rotating relative to the tube shaft, but does not prevent the rod 2 from rotating relative to the tube shaft.

[0116] exist Figure 9 and Figure 10 The fourth embodiment of the force transmission element 1 is schematically shown in the figure.

[0117] The recess in rod 2 is a circular stop that surrounds the circumference and has only one proximal stop. The recess here gradually extends distally in the axial direction at a predetermined angle. For example, the recess 5 in rod 2 can be created by turning.

[0118] The electrical insulating part 3 also abuts against the rod 2 in a circumferential and concentric manner in the area of ​​the recess 5.

[0119] The stamping portion 6 in the sleeve 4 is surrounded by only one proximal stop portion 7B and can be formed, for example, by rolling using one or more rotating rollers, with its reference axial direction tilted by a corresponding angle.

[0120] exist Figure 10 The diagram schematically shows a longitudinal sectional view of a fourth embodiment of the force transmission element 1. The sleeve 4 has a stamped portion 6 that engages within the entire recess 5, wherein the sleeve 4 abuts against the electrically insulating portion 3. A proximal stop 7B of the sleeve 4 abuts against a proximal stop 8B of the rod 2 or the insulating portion 3 in this region. Therefore, the axial degree of freedom of the rod 2 relative to the sleeve 4 is restricted, at least in the distal direction. The rod 2, together with the insulating portion 3, can rotate relative to the sleeve 4 according to the sliding characteristics between the electrically insulating portion 3 and the sleeve 4.

[0121] exist Figure 11 The diagram schematically illustrates force transmission elements used in the manufacture of surgical instruments, particularly... Figures 2 to 10 One embodiment of a method for a force transmission element 1. The method includes the following steps: providing S1, applying S2, circumferentially arranging S3, and pressing S3 in.

[0122] The step of providing Sl provides a conductive rod constructed for force transmission, which has a recess. The step of providing Sl includes a sub-step of creating S1.2.

[0123] In step S1.2, a recess is created in the rod. This recess is created, in particular, by forming (e.g., pressing) or by cutting (e.g., milling or turning). Only one (proximal or distal) stop portion of the recess may be created, optionally a recess that gradually terminates (towards the distal or proximal side), or two stops portion of the recess may be created (one proximal stop portion and one distal stop portion).

[0124] In the step of applying S2, the electrical insulation is applied circumferentially, preferably in a circumferential manner and particularly preferably concentrically, on the outer surface and at least partially along the axial direction of the rod, such that the insulation extends at least along the recess. The step of applying S2 particularly includes shrinking a heat-shrink tubing (e.g., PTFE) onto the rod or coating the rod (e.g., with a polymer or ceramic material).

[0125] In the step of circumferentially arranging S3, a conductive sleeve is arranged around the insulating portion and at least partially along the electrical insulating portion in the axial direction, preferably in a circumferential manner and particularly preferably in a concentric manner. The step of circumferentially arranging S3 includes the sub-steps of heating S3.1, pushing S3.2, and cooling S3.3.

[0126] In step S3.1, the sleeve is heated until the inner diameter of the sleeve is greater than the outer diameter of the electrical insulation part due to thermal expansion.

[0127] In step S3.2, the heated sleeve is pushed onto the electrically insulating part. The sleeve is pushed (in the axial direction) to the extent that it is at least positioned in the area of ​​the recess.

[0128] In the cooling step S3.3, the heated and pushed sleeve is cooled. This can be achieved, for example, by thermal radiation or convection towards still or flowing ambient air, or by quenching with a cooling medium.

[0129] In step S4, a stamped portion, at least partially engaged in the recess and configured for engagement with a fixation element of a surgical instrument, is pressed into the sleeve. The stamped portion can be pressed into the sleeve by means of rolling using one or more pressure rollers parallel to or inclined relative to the axial direction, or by means of stamping using one or more dies acting on the sleeve in the radial direction.

[0130] List of reference numerals

[0131] 1. Force transmission element

[0132] 2 strokes

[0133] 3 Electrical insulation parts

[0134] 4 sleeves

[0135] 5 recess

[0136] 5.1-5.4 Each concave part

[0137] 6. Stamping section

[0138] 6A is a basically flat section.

[0139] 6.1-6.4 Flat stamping section

[0140] 7A-7B Stamping Section Stop

[0141] 8A-8B recessed part stop

[0142] 10 Surgical Instruments

[0143] 11 Tube Shaft

[0144] 12 Fixing elements

[0145] 12A Surface facing the stamping section

[0146] 13 Tools / Accessories

[0147] 14 handles

[0148] 15. Movable handle grip

[0149] 16. Attachment Interface

[0150] 17. Ring spring

Claims

1. A force transmission element (1) for surgical instruments, comprising: A conductive rod (2), said rod (2) being constructed for force transmission; An electrical insulating portion (3) extends circumferentially and at least partially axially along the rod (2) on its outer surface; and A conductive sleeve (4) is arranged circumferentially around the electrically insulating portion (3) and extends at least partially along the electrically insulating portion (3) in the axial direction. The rod (2) has at least one recess (5) and the insulating portion (3) extends at least along the recess (5), and The sleeve (4) has a stamped portion (6) that extends at least partially into the recess (5) and is configured to engage with the fixation element (12) of the surgical instrument (10). The stamped portion (6) is configured to restrict at least the rotational degree of freedom about an axis parallel to the axial direction of the sleeve (4) when engaging the fixing element (12). The stamped portion (6) has at least one substantially flat section (6A) for contacting the flat surface (12A) of the fixing element (12) in a substantially flat abutting manner, the substantially flat section (6A) extending parallel to the axial direction of the sleeve (4) and located further inward in the radial direction relative to the outer surface of the sleeve (4).

2. The force transmission element (1) according to claim 1. Its features are, The rod (2) is constructed as a round rod, wherein the electrical insulation portion (3) extends at least partially around the circumference along the surface of the rod (2), and wherein the sleeve (4) is constructed as a round tube and extends at least partially around the circumference along the surface of the electrical insulation portion (3).

3. The force transmission element (1) according to claim 1. Its features are, The recess (5) has at least one substantially flat section (5A) parallel to the axial direction of the rod (2), the substantially flat section (5A) being located further inward in the radial direction relative to the outer surface of the rod (2) and contacting the substantially flat section (6A) of the stamping part (6) in an abutting manner.

4. The force transmission element (1) according to claim 3. Its features are, The substantially flat section (5A) contacts the substantially flat section (6A) of the stamping part (6) in such a way that they are flat against each other.

5. The force transmission element (1) according to any one of claims 1 to 4. Its features are, The stamping part (6) is configured to at least restrict or prohibit translational freedom in the direction parallel to the sleeve (4) when engaging the fixing element (12).

6. The force transmission element (1) according to claim 5. Its features are, The stamping part (6) has at least one stop (7A, 7B) for at least restricting or prohibiting the translational degree of freedom.

7. The force transmission element (1) according to claim 5. Its features are, The recess (5) has at least one stop (8A, 8B) which is configured to, together with the stamping part (6), at least restrict or prohibit the translational degree of freedom in the direction parallel to the rod (2).

8. The force transmission element (1) according to any one of claims 1 to 4. Its features are, The electrical insulating part (3) has sliding properties on the outer surface of the electrical insulating part (3) at least in the region of the stamping part (6), and / or the sleeve (4) has sliding properties on the inner surface of the sleeve (4) at least in the region of the stamping part (6).

9. A surgical instrument (10) comprising: Force transmission element (1) according to any one of the preceding claims; The force transmission element (1) is received in the tube shaft (11); A fixing element (12) is supported in the tube shaft (11) and engaged in the stamping part (6) of the sleeve (4) of the force transmission element (1); Tool (13), which can be moved by means of the force transmission element (1); as well as An operating interface is configured to operate the force transmission element (1).

10. The surgical instrument (10) according to claim 9. Its features are, The tube shaft (11) is constructed as a round tube, wherein the rod (2) of the force transmission element (1) is constructed as a round rod and the electrical insulation portion (3) extends at least partially around the circumference along the surface of the rod (2), wherein the sleeve (4) is constructed as a round tube and extends at least partially around the circumference along the surface of the electrical insulation portion (3), and wherein the force transmission element (1) is concentrically arranged in the tube shaft (11).

11. The surgical instrument (10) according to claim 9 or 10. Its features are, The fixing element (12) has sliding properties on its surface facing the stamping part (6) and / or the stamping part (6) has sliding properties on its outer surface.

12. A method for manufacturing a force transmission element (1) for a surgical instrument, said force transmission element (1) being a force transmission element according to any one of claims 1 to 8, said method comprising the following steps: Provided (Sl), wherein a conductive rod (2) configured for force transmission is provided, the rod (2) having a recess (5); Application (S2), wherein an electrical insulating portion (3) is applied circumferentially and at least partially along the rod (2) on the outer surface, such that the insulating portion (3) extends at least along the recess (5); A circumferentially arranged (S3) sleeve (4) is arranged circumferentially around the insulating portion (3) and at least partially along the electrical insulating portion (3) in the axial direction; and Press-in (S4), wherein a stamp (6) that is at least partially engaged in the recess (5) and configured to engage with a fixing element (12) of a surgical instrument (10) is pressed into the sleeve (4).

13. The method according to claim 12, Its features are, The provision (S1) includes the step of creating (S1.2) the recess (5) in the rod (2).

14. The method according to claim 13, Its features are, The provision (S1) includes the step of creating (S1.2) the recess (5) in the rod (2) by forming or cutting.

15. The method according to claim 12 or 13, Its features are, The application (S2) of the insulating part (3) includes shrinking the heat shrink tubing onto the rod (2) or coating the rod (2).

16. The method according to claim 12 or 13, Its features are, The step of circumferential arrangement (S3) includes the following steps: Heating (S3.1), wherein the sleeve (4) is heated until the inner diameter of the sleeve (4) is greater than the outer diameter of the electrical insulation part (3) due to thermal expansion; Pushing (S3.2), wherein the sleeve (4) to be heated is pushed onto the electrically insulating part (3); and Cooling (S3.3), wherein the heated and pushed sleeve (4) is cooled.

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