Klemmer clamp - manual HF activation

Abstract

The present disclosure relates to a bipolar HF instrument (1) having a jaw part (2), a first instrument branch (3) and a second instrument branch (4) for grasping tissue, which first and second instrument branches are arranged and configured to move away from each other when opened and to move towards each other when closed, a blade actuating element (5) for moving a mechanical blade (6) in the jaw part (2) to cut tissue, and / or an HF activation element (7) for activating an HF current supply to seal tissue, characterized in that the blade actuating element (5) and / or the HF activation element (7) are arranged and configured to be operable identically from both opposite sides of the HF instrument (1), respectively.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a (medical) bipolar HF instrument of the scissor or forceps type, having a first and a second (crossing in a hinge) instrument branch, which are configured or have, at the distal instrument end section, e.g. a jaw portion for grasping tissue and, at the proximal instrument end section, a holding / manipulation geometry (handle, finger loop, etc.), all of which are designed and configured to move away from each other in the open and towards each other in the closed state for manually cutting and (HF) sealing tissue, especially in open surgery. BACKGROUND

[0002] Generally, surgical sealing and cutting instruments of the above-mentioned type are known, which use high-frequency (HF) current for sealing by means of bipolar technology and a mechanical blade for cutting (biological) tissue. Here, an automatic continuous activation is provided upon the branches being squeezed together. A blade lock is often integrated into the instrument as a safety measure in the open state of the branches. A HF key provided in addition usually obtains a haptic feedback in two stages (2-click-key). At the first click, the user is prompted that a defined closed state has been reached and at the second click the HF current is activated. With such a surgical instrument in the prior art, a fast working method is possible, especially for experienced users. The surgical instrument has a clear separation of the functions for cutting and sealing and a low manufacturing cost.

[0003] Alternatively, there are surgical instruments which seal and cut using ultrasound, wherein the sealing and cutting is manually continuously activatable. In addition, this surgical instrument offers a choice between MIN or MAX mode on the instrument. Advantageously, it is not possible to activate unintentionally in the closed state, especially since the user has the freedom to choose and thus offers more checks and safety.

[0004] However, the known surgical instrument has the disadvantage that the HF key has to be held permanently and this is continuously ergonomically and tiring for the user, especially since several activations are conceivable per operation. A further disadvantage can be the variation of the applied pressure. In fact, the user can vary the manipulation pressure on the instrument / its branches due to his hand force and thus can negatively influence the sealing result. An unintentional HF activation under too fast squeezing together and a preferred orientation when handling due to the asymmetric arrangement of the blade manipulation elements are further disadvantages.

[0005] PRIOR ART

[0006] US 10 188 450 B2 describes a forceps having first and second handles (branches) each having a jaw element arranged on a distal end thereof. At least one jaw element is movable from an open position to a closed position to grasp tissue therebetween. At least one jaw element is configured to reciprocate a blade. A trigger assembly includes a trigger and at least one link connected with the trigger and the blade such that rotation of the trigger displaces the blade between a retracted position and a displaced position. A locking element is also provided which is movable between a locked position and an unlocked position. The locking element is configured such that the locking element engages the link in the locked position to prevent displacement of the blade from the retracted position into the displaced position.

[0007] US 10 660 694 B2 describes a switch assembly for an electrosurgical instrument having a switch housing, a switch, a first biasing element, and an additional biasing element. The switch is arranged within the switch housing and is movably arranged between an activated position for introduction of an electrosurgical energy release and a deactivated position for termination of the electrosurgical energy release. The first biasing element is selectively positionable adjacent to the switch and connected with the switch. The first biasing element includes a first thickness that provides a first resistance to movement of the switch between the activated position and the deactivated position when the switch is positioned in the switch housing. The additional biasing element is selectively interchangeable with the first biasing element. The additional biasing element has a different thickness that provides a different resistance to movement of the switch between the activated position and the deactivated position when the switch is positioned in the switch housing.

[0008] From EP 2 671 528 B1 and EP 2 436 330 B1 a bipolar electrosurgical instrument is known having first and second handles (branches) each having a jaw element extending from a distal end thereof. Each jaw element is adapted to establish a connection with an electrosurgical energy source such that the jaw elements are selectively able to conduct energy through tissue held therebetween. A knife channel is configured such that the knife channel reciprocates a cutting mechanism therein. An actuator selectively advances the cutting mechanism. A switch is arranged on a first shaft and is configured to be depressed between a first position and at least one subsequent position upon biasing engagement with a mechanical interface arranged on a second shaft. The first position of the switch relays information corresponding to a desired pressure on tissue to a user and the at least one subsequent position is configured to activate the electrosurgical energy source to supply electrosurgical energy to the jaw elements.

[0009] US 7 253 667 B2, US 9 498 279 B2, US 2019 0356 952 A1, WO 2019 224 634 A1, EP 1 609 430 B1, US 2019 0357 969 A1, WO 2019 224 636 A3, US 2019 0357 967 A1 and WO 2019 224 637 A1 likewise describe electrosurgical instruments. SUMMARY

[0010] It is the task of the present disclosure to provide a bipolar HF instrument which, inter alia, enables simplified handling over an extended period of time and, in addition, the orientation of the instrument is irrelevant for the use. Furthermore, it is the object of the present disclosure, inter alia, to eliminate or at least improve the above-mentioned disadvantages in the prior art.

[0011] This task is solved by a bipolar HF instrument according to the present application.

[0012] The bipolar HF (hand-held) instrument thus has a jaw portion (for grasping / holding / gripping tissue) and a first instrument branch and a second instrument branch (for manually manipulating the jaw portion), which (all) are arranged and configured to move away from each other in the open state and towards each other in the closed state. Furthermore, a blade manipulation element / blade manipulation lever or (displacement) key is provided for activating a mechanical blade supported in the jaw portion to cut tissue, wherein the mechanical blade is arranged and configured to be movable by means of the blade manipulation element from a first position (stop / non-cutting position) to a second position (cutting position). Furthermore, an HF activation element or activation key / button / switch for activating / releasing an HF current supply, in particular for sealing (coagulating) tissue, is provided and, if necessary, a latching device, preferably configured separately therefrom, is provided on the branches in order to (optionally) achieve a latched branch state in the case of closed instrument branches.

[0013] The basic idea of the present disclosure is now that the blade manipulation element and / or the HF activation element are arranged and configured to be operable from both, preferably respectively opposite (or facing away from each other), sides of the HF instrument, respectively, in a further preferably identical or similar manner. This has the advantage that the mechanical blade can always be manipulated in the same way, regardless of where the instrument is held or in which hand. There is thus no preferred orientation or posture of the instrument. This is equally true for the operation as a right- or left-hander. In other words, it is irrelevant how the user holds the bipolar HF instrument in his hand, since the operation by means of the double-sided configuration of the blade manipulation element and the HF activation element always functions in the same way.

[0014] In other words, the present subject matter according to the present disclosure is a surgical (hand-held) instrument of the scissors or forceps construction type with bipolar HF technology and a mechanical (tissue cutting) blade. By opening and closing the instrument branches, the jaw portions are also opened and closed. In the closed state, tissue can be grasped and sealed by means of HF (high-frequency energy supply) by electrodes arranged in the jaw portions. Furthermore, with the jaw portions, preparation and manipulation on the tissue can be carried out. In the closed state of the jaw portions, the tissue can also be cut by means of a blade supported in the jaw portions. The handling means for individually and individually manually manipulating the HF current supply and the blade are constructed and arranged in such a way that on both respectively opposite or mutually facing sides of the instrument substantially the same handling geometry is obtained, substantially the same function / action for the HF current supply and the blade. It is expressly pointed out in this connection that the above-mentioned reflection on the handling geometry does not necessarily have to be realized only two-dimensionally, but also three-dimensionally. In other words, the two handling means for manipulating the HF current and the blade can be arranged substantially identically (mirror- image) on the left and right side of the instrument, for example (two-dimensional replication), or only one handling means (if necessary blade manipulation) is arranged on the left and right side of the instrument, and the other handling means (if necessary HF current supply) is arranged on the upper and lower side of the instrument (respectively mirror- image) (three-dimensional replication).

[0015] The mechanical blade is movable from a first position to a second position by means of a blade handling element. Here, the blade handling element is moved linearly from its distally located rest position proximally. The mechanical blade is correspondingly moved linearly from its proximally located rest position distally and can thus cut tissue grasped in the jaw portion.

[0016] Furthermore, the instrument preferably has a fixedly installed detent device in the form of a channel lock. By means of the detent, the instrument branches can be locked in a defined state (relative position). For detent, the instrument branches are closed until the detent state is achieved. For release, the branches are again slightly pressed together until the detent is released. The design of the detent device / detent / channel lock is sufficiently known from the prior art and therefore does not need to be described further. It has the main advantage that with its aid a defined closed state can be produced in which fluctuations in the closure force can only be expected to a small extent. This in turn has the advantage of increasing the sealing quality or ensuring constant performance. Furthermore, the detent device enables the user to safely hold the tissue without the user triggering the HF activation. A further advantage is that the user can relax the user's hand when the detent is closed. There is no need for the instrument to be permanently pressed together. The present disclosure is therefore particularly ergonomic.

[0017] Further aspects of the present disclosure are described below.

[0018] Advantageously, the latching device consists of a male part and a female part. In other words, the HF can be activated and cut in the closed and latched state. Usually, the HF is activated first and the sealing is performed. For this purpose, the HF activation element is moved proximally. A tap activation is preferably provided, so that the user has to manipulate the key / button only once and does not have to hold it permanently. The HF generator takes over the logic with its integrated algorithm and is automatically switched off after successful sealing. However, the user always has the possibility to stop the sealing process by tapping the HF activation key / button again. The cutting can be performed in a second step. For this purpose, the blade handling element is pulled proximally. Not only the HF activation element, but also the blade handling element is preferably automatically reset by a spring.

[0019] It is preferred that the functions of sealing and / or cutting can be used independently of each other. In other words, the user is free to use the sealing and / or cutting functions independently of each other.

[0020] It is preferred that the first rack and pinion mechanism is provided and arranged in the first instrument branch, wherein an input rack is connected with the blade handling element and an output rack is connected with the mechanical blade, wherein the blade handling element can be moved proximally linearly from a distal rest position. In other words, the deflection mechanism required for this in the first instrument branch is a rack and pinion mechanism, wherein the input rack is fastened on the blade handling element and the output rack is fastened on the mechanical blade.

[0021] It is advantageous that the input rack and the blade handling element connected therewith are approximately arranged on a symmetry plane between the first instrument branch and the second instrument branch.

[0022] In other words, the way of working of the rack and pinion mechanism presents a significant advantage for the symmetrical use of the instrument. The arrangement of the input rod and the blade handling element connected therewith approximately on a symmetry plane between the first and second instrument branch provides the great advantage that the blade can be manipulated identically, regardless of where the instrument is held. In this respect, there is no preferred orientation or posture of the instrument. The same applies to the handling as a right- or left-hander.

[0023] It is preferred that the bipolar HF instrument also has a blade lock, which is configured to block the manipulation of the mechanical blade in an open state and in a defined closed state the mechanical blade is movable. Here, two different safety concepts can be implemented in the bipolar HF instrument are provided.

[0024] In a first safety concept it is provided that the blade manipulation is possible as soon as the jaw portions are sufficiently closed, for example when the jaw portions are in contact with each other. The HF activation / manipulation is possible in principle at all times. That is to say, there is no locking of the HF activation element. Here, it is alternatively provided that the HF can be activated when the instrument is not latched. This enables the user to implement more application possibilities, but also entails the risk that the HF activation takes place with insufficient closure force. Here, the fixed latching device enables a defined closure state.

[0025] In a second safety concept, not only the blade manipulation but also the HF manipulation is possible only when the instrument is in the latched position of the fixed latching device. This ensures that not only the cutting but also the HF sealing is possible only in a clearly defined closure state and ensures maximum safety. This alternative, however, limits the possibilities of the user. Particularly experienced users can feel this safety concept as a strong limitation. It is therefore preferable that the first safety concept is used for experienced users and the second safety concept is used for less experienced users.

[0026] Preferably, the HF activation element is configured and arranged so as to be able to move proximally or to be able to pivot or to be able to move when performing the sealing.

[0027] Advantageously, the HF activation element is configured and arranged so as to activate the HF current supply after a first knock activation and to automatically switch off, preferably by means of an integrated algorithm, after a successful sealing or to manually stop the HF current supply before a successful sealing after a second knock activation of the HF activation element.

[0028] Preferably, the HF activation element has an inner portion which is mounted so as to be able to pivot, to be able to move or to be able to swing on a rotation axis of the HF activation element in the second instrument branch orthogonally to the proximal-distal direction, wherein a side of the inner portion which faces in the proximal direction of the instrument comprises a contact element with an activation surface which contacts a first HF activation button when the HF activation element is manipulated and activates the HF current supply.

[0029] In other words, the design and positioning of the HF manipulation button also pursues the goal of enabling the instrument to be operated completely symmetrically or to avoid the necessity of preferably orienting the instrument.

[0030] According to a first preferred embodiment, the HF activation element is mounted so as to be able to pivot in the second branch about an axis and can be reached equally well from both sides of the instrument. Furthermore, the advantage of the positioning of the HF activation element in only one instrument branch is that the wiring of the HF activation is also in only one instrument branch. This significantly reduces complexity and costs compared to the solution with manipulation buttons / HF activation buttons in both instrument branches.

[0031] Advantageously, the inner portion of the HF activation element has a first wing and a second wing, wherein the first wing projects laterally at the second instrument branch and the second wing projects opposite the first wing on the other side of the second instrument branch.

[0032] In other words, the HF activation element consists of several parts, namely the inner portion and the first and second wings. Alternatively, a one-piece embodiment is also conceivable under other installation conditions.

[0033] Alternatively, it is conceivable to design the HF activation element as a slide, which can be moved linearly in the proximal and distal direction. To this end, the HF activation element is advantageously movably guided, for example, in a slit in the housing of the second instrument branch. This has the advantage that exactly one electronic HF activation button is required.

[0034] The activation surface of the HF activation element according to the above-described embodiments is provided for pressing on the first (electronic) HF activation button.

[0035] According to the application, the contact element is provided and configured in the form of a cam in the direction of the first HF activation button.

[0036] In another example not belonging to the application, the second rack-and-pinion gear mechanism is positioned in the distal direction of the first HF activation button so that the first HF activation button comes into contact with the activation surface when the HF activation element is manipulated.

[0037] In other words, an alternative embodiment with exactly one electronic HF activation button is possible. To this end, the inner portion of the HF activation element has a type of cam or the like, which engages with the first HF activation button when rotated / pivoted around the rotational axis of the HF activation element. Here, an additional return spring is provided and, if necessary, is required.

[0038] The alternative embodiment is provided when using the first (exactly one) HF activation button, with a rack-and-pinion gear mechanism. Here, the inner portion of the HF activation element is likewise rotatably supported and connected with a pinion. On both sides of the pinion, two racks are placed accordingly, which can each transmit their movement to the contact element / activation element / pressure plate. The contact element then manipulates the first HF activation button. Depending on the embodiment of the HF activation button, the contact element is superfluous and the racks can press directly onto the HF activation button. In order to achieve a reliable function, it is advantageous for the racks to be provided with a return spring.

[0039] Advantageously, the second HF activation button is arranged and disposed parallel to the inner portion of the HF activation element next to the first HF activation button. In other words, the activation face of the contact element exerts a force onto one of the two HF activation buttons by twisting / pivoting / displacing the HF activation element and thereby triggers the activation of the HF process. By re-twisting / pivoting / displacing the HF activation element, the HF process can also be manually stopped when required. In addition to a fully symmetrical design, the above-described embodiment has the advantage that the HF activation element is not only manipulable by pulling but also by pressing. This opens up a number of ergonomic manipulation options for the user.

[0040] Preferably, a return into the unmanipulated rest position is provided by a spring integrated in the HF activation button. Alternatively thereto, an additional return spring can be realized in the form of a leaf spring / flat spring, torsion spring or the like.

[0041] It is therefore advantageous that the inner portion of the HF activation element is supported by a spring element, for example a compression spring. This has the advantage that the spring element causes the entire HF activation element to protrude by a distance in the axial direction of its rotational axis. This results in the activation face, which can be pressed onto the first and / or second HF activation button, to disengage and thus not be able to activate the HF energy supply in this position when the HF activation element is manipulated. In the closed state, the HF activation element is pressed in the second instrument branch. In this position, the activation face re-engages with the first and / or second HF activation button by closing the first and second instrument branches and the resulting compression of the spring together in the second instrument branch. In this case, it is advantageous that the HF activation element has a separate return spring which permanently presses the HF activation element into a rest position in which the fins of the HF activation element are perpendicular to the main plane of the instrument. As a return spring, a flat spring, a tension spring, a torsion spring or the like can be used.

[0042] Advantageously, commercially available electronic buttons can be used for the first HF activation button and / or the second HF activation button.

[0043] Preferably, the first HF activation button and / or the second HF activation button are arranged on a circuit board in the second instrument branch distally from the inner portion of the HF activation element but facing said inner portion. In other words, it is preferred that the first HF activation button and / or the second HF activation button are on a circuit board on which the first HF activation button and / or the second HF activation button are wired to each other with an "or" logic. This ensures that an action is performed regardless of which of the HF activation buttons is pressed.

[0044] Alternatively, it is preferred that the HF activation element is embodied as a lever. Here it is provided that the position of this lever is switchable as soon as the bipolar HF instrument is rotated, so that the instrument can also be manipulated completely symmetrically. The lever is thus on both sides of the instrument or second instrument branch. It is advantageous in this regard that the first and second HF activation buttons are arranged / placed in the instrument branch or the housing of the instrument branch, which are opposite each other, so that when the lever is in position 1, the first HF activation button is pressed when being manipulated, and when the lever is in position 2, the second HF activation button is pressed when being manipulated. Preferably, the switchability from position 1 to position 2 is achieved by a snap mechanism, so that the lever is configured to be perceptibly latched into the defined positions.

[0045] It is preferred that the installation of the HF activation element lock is provided in accordance with a second safety concept. In other words, here the manipulation of the HF activation element in the open state is prevented by a locking element. The manipulation is achieved in the closed state.

[0046] It is advantageous that the locking element has a striker, which protrudes from the handle housing of the second instrument branch and can come into contact with the opposite handle housing of the second instrument branch when the instrument is closed. In addition to the striker, a locking element is provided, for example a pin. The pin is arranged and configured to interact with a hole in the inner part of the HF activation element. In the open state, the pin is in the hole and a twisting / manipulation of the HF activation element is not possible. In the closed state, the pin is pushed out of the hole by the striker and a twisting / manipulation of the HF activation element is possible. It is preferred here that the locking element is equipped / configured with guide elements on both sides, in order to prevent a twisting of the locking element.

[0047] It is preferred that the blade manipulation element has a different shape than the HF activation element. Preferably, the blade manipulation element is configured circular and the HF activation element has a further shape, for example a rectangular shape. Furthermore, additionally or alternatively, it is preferred that the HF activation element has a different color than the rest of the instrument, preferably blue, especially since blue is usually associated with HF activation in surgical procedures. Furthermore, it is advantageous that the HF activation element is additionally or alternatively provided at a sufficient distance from the blade manipulation element. These differences have the advantage that the risk of confusion between the blade manipulation element and the HF activation element can be reduced as much as possible.

[0048] Preferably, the distance of the blade manipulation element from the handle of the first instrument branch is 76 ± 20 mm and the distance of the HF activation element from the handle of the first instrument branch is 42 ± 20 mm.

[0049] Advantageously, the HF activation element is sealed against the intrusion of liquids, in particular blood, water, saline solutions, etc. Preferably, the first and / or second handle housing of the first and / or second instrument branch is provided with a seal all around. Alternatively or additionally, it is provided that the seal is present only in the region of the HF activation element. In other words, due to the use of the instrument in open surgery, a further important aspect of the HF activation element is the sealing against the intrusion of liquids. It must therefore be ensured that no unwanted HF activation occurs upon the intrusion of liquids. To this end, it is provided that the HF activation element is correspondingly sealed. It is preferred here that the handle housing is sealed with a seal, for example TPE. The seal can be present all around the contour of the handle housing and / or only in the region of the HF activation element. The seal can be injection-molded together in the handle housing or be a separate part which is inserted together at the time of installation. The sealing effect is achieved by the extrusion or screw connection with the second handle housing.

[0050] Alternatively or additionally, it is preferred that the first and / or second HF activation button used is already sealed in its delivery state. In other words, it is provided that a sealed HF activation button is used which is already sealed in its delivery state. Here, the circuit board on which the HF activation button is applied / soldered must additionally be sealed in order that no short circuit occurs at the contacts of the circuit board. To this end, it is preferred that the circuit board is, for example, injection-molded with plastic.

[0051] Alternatively or additionally, it is preferred that a seal is provided on the axis / axis of the inner part of the HF activation element, which seal has an elastomer seal ring (O-ring).

[0052] Alternatively, the present disclosure relates to a bipolar HF instrument which can alternatively be used. This bipolar HF instrument is provided with a jaw part which has a first instrument branch and a second instrument branch for grasping tissue, which are arranged and configured to move away from one another when opened and to move towards one another when closed, a blade actuating element for activating a mechanical blade in the jaw part to cut tissue, which is arranged and configured to be movable by means of the blade actuating element from a first position into a second position, exactly two HF activation buttons for activating an HF current supply to seal tissue, and preferably an engageable latching device in order to achieve a latched state in the closed instrument branches, wherein the blade actuating element and the HF activation element are arranged symmetrically and configured to be simultaneously operable from both sides of the HF instrument, wherein the HF activation elements are each arranged laterally on the first and second instrument branches.

[0053] In other words, for ergonomic improvements, the HF activation element can be placed laterally on the first and second instrument branches. The instrument is thus also completely symmetrical. This embodiment preferably has an accessible click device which can be rotated into by means of a proximally arranged rotary lever. In order to ensure that the user exerts sufficient closure force in the event of a click device disconnection, an additional control means is provided here in the form of a third button. The third button is connected in "and" logic with the HF activation button and must be permanently actuated, whereby the HF energy supply can be activated. Alternatively or additionally, a sensor, such as a pressure sensor, distance sensor or the like, is provided as a further control means. In this way, the user is provided with as many application possibilities as possible. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 Bipolar HF instrument in open and disengaged state.

[0055] Figure 2 Bipolar HF instrument in closed and unlocked state.

[0056] Figure 3 Bipolar HF instrument in closed and locked state.

[0057] Figure 4 Bipolar HF instrument with open instrument branches.

[0058] Figure 5 Bipolar HF instrument with open instrument branches and blade, wherein a part of the first instrument branch and the jaw portion is hidden.

[0059] Figure 6 HF activation element according to the first embodiment.

[0060] Figure 7 HF activation element in top view with additionally represented electronic button and circuit board according to the first embodiment.

[0061] Figure 8 HF activation element according to the second embodiment

[0062] Figure 9 HF activation element according to the third embodiment by means of rack and pinion.

[0063] Figure 10 HF activation element according to the fourth embodiment as a slider.

[0064] Figure 11A and Figure 11B HF instrument with lever as HF activation element.

[0065] Figure 12 HF instrument from above.

[0066] Figure 13 HF activation button and arrangement of the lever as HF activation button.

[0067] Figure 14 and Figure 15 Bipolar HF instrument with HF activation element according to second safety concept.

[0068] Figure 16 and Figure 17 HF instrument with HF activation element locking element.

[0069] Figure 18 , Figure 19 and Figure 20 Activation element locking element.

[0070] Figure 21 Internal part of HF activation element.

[0071] Figure 22 Distances between individual components of HF instrument.

[0072] Figure 23 HF activation element with sealing of HF activation element.

[0073] Figure 24 HF activation button.

[0074] Figure 25 Internal part of HF activation element with sealing ring.

[0075] Figure 26 and Figure 27 Further alternative embodiments of HF instrument.

[0076] Figure 28 HF instrument according to Figures 1 to 5 in top view.

[0077] wherein: 1 - instrument; 2 - jaw part; 3 - first instrument branch; 4 - second instrument branch; 5 - blade actuating element; 5A - return spring of blade actuating element; 6 - blade; 7 - HF activation element; 7A - inner part of HF activation element; 7B - first wing of HF activation element; 7C - second wing of HF activation element; 7D - return spring; 7E - spring element; 8 - latching device; 8A - male part of latching device; 8B - female part of latching device; 8C - return spring of latching device; 9 - first rack and pinion gear mechanism; 10 - input rack; 11 - output rack; 12 - gear wheel; 13 - contact element; 14 - activation surface; 15 - first HF activation button; 16 - second HF activation button; 17 - circuit board; 18 - second rack and pinion gear mechanism; 19 - central axis of HF activation element; 20 - instrument handling eye; 21 - slit; 22 - flat plug; 23 - joint; 24 - first rack; 25 - second rack; 26 - gear wheel; 27 - lever; 28 - HF activation element locking element; 29 - impact rod; 30 - pin; 31 - guide element; 32 - hole; 33 - seal; 34 - sealing ring; 35 - half sphere; 36 - rotary lever; 37 - control means. DETAILED DESCRIPTION

[0078] Embodiments of the present disclosure are described below based on the drawings.

[0079] Figure 1 A bipolar HF instrument 1 of the scissors or forceps construction type is shown in the open and uncoupled state. The bipolar HF instrument 1 has a jaw part 2, a first instrument branch 3 and a second instrument branch 4 which are coupled to the jaw part 2 by means of a transmission mechanism or material. Due to the opening and closing of the first instrument branch 3 and the second instrument branch 4, the first instrument branch and the second instrument branch pivot about a hinge which is not further represented in the drawing, whereby the jaw part 2 likewise opens and closes correspondingly. Figure 1 In the closed state, the jaw part 2 can grasp / seize / hold tissue and seal by means of a HF energy supply on electrodes in the jaw part 2 which are not further represented. HF technology is sufficiently known from the prior art, for example from the applicant.

[0080] The first instrument branch 3 and the second instrument branch 4 also each have a ring-shaped instrument handling eye 20 in the proximal half of the instrument branches 3 and 4 into which the fingers of the handling hand can be introduced. Other instrument handling forms are of course also conceivable, for example an open clamp or a penetrating slit in the instrument branches 3, 4.

[0081] In the instrument 1, in particular in the region of the jaw portion 2, a mechanical blade 6 is provided, which can be moved, preferably in the longitudinal direction of the instrument, by means of a blade actuating element / key / button 5. The mechanical blade 6 is provided for cutting tissue which is grasped in the jaw portion 2. The arrangement of the mechanical blade 6 is shown in more detail in Figure 5 .

[0082] The blade actuating element 5 is arranged in the first instrument branch 3 in the present case. The blade actuating element 5 is configured for linear movement from its distal rest position proximally, i.e. in the direction away from the jaw portion 2 / away from the patient. According to Figure 1 , the blade actuating element 5 is supported movably longitudinally within a slit 21 which is formed in the instrument branch 3. The blade actuating element 5 is arranged here between the annular instrument actuating eye 20 of the first instrument branch 3 on the side which adjoins the second instrument branch 4 and the jaw portion 2. The blade actuating element 5 is preferably configured as a pin which protrudes laterally from the instrument branch 3. Figure 1

[0083] The jaw portion 2 of the bipolar HF instrument 1 also has an HF cable (not shown) which is supplied with HF energy after actuation of the HF activation element 7 and forwards it to the electrodes in the jaw portion 2. The HF cable is connected to the flat plug 22. The HF cable is connected to the elements of the jaw portion 2, respectively. The elements of the jaw portion 2 are electrically insulated from one another (insulation not shown).

[0084] The HF activation element 7 is arranged in / on the second instrument branch 4 on the side which adjoins the first instrument branch 3. In this case, the HF activation element 7 is placed closer to the annular instrument actuating eye 20 than the blade actuating element 5 and the slit 21 in the first instrument branch 3 to which the blade actuating element belongs. The HF activation element 7 is preferably configured as a rectangular knock key. Figure 1

[0085] Finally, the bipolar HF instrument 1 has a catch device 8 of generally known construction at the height of the annular instrument actuating eye 20. The catch device 8 has a male part 8A and a female part 8B, which are shown in more detail in Figure 4 . The catch device 8 is provided on the sides of the instrument branches 3 and 4 which face one another. In Figure 1 , the catch device 8 is shown in the uncoupled state.

[0086] Figure 2 The bipolar HF instrument 1 is shown in the closed state of the catch device 8 and in the (still) uncoupled state. In Figure 2 , the catch device 8 is shown in the coupled state. Figure 1 ​​The bipolar HF instrument 1 according to the application is shown in a closed and unlocked state in Figure 2 In the closed and unlocked state shown in

[0087] In the further closed state of the instrument branches 3 and 4, the locking device 8 is completely locked. Figure 3 The bipolar HF instrument 1 is shown in this closed and locked state. In Figure 3 The bipolar HF instrument 1 according to the application is shown in a closed and unlocked state in Figure 1 and Figure 2 The bipolar HF instrument 1 according to the application is shown in a closed and unlocked state in

[0088] In Figure 3 A solid arrow in proximal direction is shown in

[0089] Furthermore, a short arrow in solid line in proximal direction is presented in Figure 3 This arrow presents the movement direction of the HF activation element 7 in order to activate the HF energy supply. A dashed arrow in distal direction, parallel to the short solid line arrow, indicates the direction of the reset path of the HF activation element 7.

[0090] Figure 4 The bipolar HF instrument 1 with open instrument branches 3 and 4 is shown in longitudinal section. The first instrument branch 3 and the second instrument branch 4 each comprise two half handle housings, which enclose a hollow chamber, wherein Figure 4 In

[0091] In Figure 4 The handle housing of the first instrument branch 3 is shown with a first rack and pinion gear mechanism 9 having an input rack 10 and an output rack 11. The input rack 10 is fixedly connected with the blade manipulation element 5 (not shown in Figure 4 The output rack 11 is fixedly connected with the mechanical blade 6 (not shown in Figure 4(Not shown in the diagram) Fixed connection. The input rack 10 and output rack 11 are interconnected by a gear 12 with an intermediate connection, such that when the user manipulates the blade operating element 5 in the proximal direction, the mechanical blade 6 moves from its proximal rest position to the distal position to cut the tissue gripped in the jaw portion 2. The rack and pinion transmission mechanism 9 here serves as a deflection mechanism in the first instrument branch 3. Furthermore, for the protruding blade mechanism, the return spring 5A is configured to automatically push the blade operating element 5, and thus the blade 6, back to their respective rest positions.

[0092] exist Figure 4 The diagram shows the handle housing of the second instrument branch 4, which has the internal structure of the HF activation element 7. Specifically, the internal portion 7A of the HF activation element 7 is shown, which is arranged distal to the first HF activation button 15. If a second HF activation button 16 is provided, this second HF activation button is laterally arranged next to the first HF activation button 15 shown, and therefore... Figure 4 The HF activation button 15 shown is located on the circuit board 17. As long as the first and second HF activation buttons 15 and 16 are provided, they are wired to each other via the circuit board 17 using OR logic. Furthermore, flat plugs 22 are provided not only in the first instrument branch 3 but also in the second instrument branch 4 to contact the HF stranded wire of the jaw portion 2.

[0093] In addition, Figure 4 The locking device 8 is shown in longitudinal section. The locking device 8 has a male portion 8A on the side of the first instrument branch 3 and a female portion 8B on the side of the second instrument branch 4. When pressed together, the two portions 8A and 8B lock together. By re-pressing them together, the locking state can be released again by means of an installed return spring 8C.

[0094] Figure 5 A bipolar HF instrument 1 with open instrument branches 3 and 4 and a blade 6 is shown, wherein the first instrument branch 3 and a portion of the jaw portion 2 are hidden. Figure 5 Showing and already targeted Figure 4 The same components are described. Additionally, a mechanical blade 6 is shown, which is arranged in the jaw portion 2 and the first instrument branch 3 and connected to the output rack 10.

[0095] Figure 6An HF activation element 7 according to the first embodiment is shown. The HF activation element 7 has an inner portion in the form of a crosspiece 7A, which interconnects a first actuating flap or button 7B and a second actuating flap or button 7C. According to this embodiment, the end portions of the crosspiece-shaped inner portion 7A are bonded and / or pressed in / on the first actuating flap 7B or the second actuating flap 7C, respectively. The first actuating flap 7B and the second actuating flap 7C are arranged laterally and externally of the second instrument branch 4, that is to say on sides facing away from or opposite to one another. The inner portion 7A is in the interior space of the second instrument branch 4. In the proximal direction of the HF instrument or in the downward direction, a contact element 13 with an activation face 14 is fastened on the middle section of the inner portion 7A. As soon as the user actuates the HF activation element 7, the contact element 13 connected with the inner portion 7A presses the activation face 14 onto the HF activation button 15 (not shown in the figures) and activates the HF energy supply. Figure 4 In the middle, in the downward direction, a contact element 13 with an activation face 14 is fastened on the middle section of the inner portion 7A. As soon as the user actuates the HF activation element 7, the contact element 13 connected with the inner portion 7A presses the activation face 14 onto the HF activation button 15 (not shown in the figures) and activates the HF energy supply. Figure 6 In the middle, in the downward direction, a contact element 13 with an activation face 14 is fastened on the middle section of the inner portion 7A. As soon as the user actuates the HF activation element 7, the contact element 13 connected with the inner portion 7A presses the activation face 14 onto the HF activation button 15 (not shown in the figures) and activates the HF energy supply.

[0096] The contact element 13 is constructed and installed T-shaped on the middle axis 19 of the HF activation element 7, that is to say in the center of the inner portion 7A. The activation face 14 is arranged on the side of the contact element 13 facing the HF activation button 15. The HF activation element 7 is swingably supported in the second instrument branch 4 along the middle axis 19, so that the two actuating flaps 7B and 7C laterally protrude on the second instrument branch and can thus be reached and actuated equally well from both sides of the instrument 1.

[0097] Figure 7 An HF activation element 7 according to the first embodiment is shown. According to Figure 7 An inner portion 7A of the HF activation element 7 with a first actuating flap 7B and a second actuating flap 7C is shown. In the center of the inner portion 7A of the HF activation element 7, in the direction towards the first and second HF activation buttons 15, a contact element 13 with an activation face 14 is installed on the inner portion 7A or constructed thereon.

[0098] In this embodiment, first and second HF activation buttons 15, 16 are provided, which are arranged side by side and, in the middle, below the activation face 14, that is to say according to Figure 7 In this embodiment, first and second HF activation buttons 15, 16 are provided, which are arranged side by side and, in the middle, below the activation face 14, that is to say according to Figure 5Arranged proximally of the activation face 14 are two HF activation buttons 15, 16 which are arranged on a (unique) circuit board 17. On the circuit board 17 are provided two terminals 23 which are used for the energy supply. By twisting / pivoting / swinging the HF activation element 7 in the longitudinal direction of the central axis 19, the activation face 14 presses on one of the two HF activation buttons 15, 16, irrespective of which of the two handle flaps 7B, 7C the user uses on the opposite side of the instrument 1, thereby releasing the HF current to the electrodes in the jaw portion 2.

[0099] Figure 8 An HF activation element 7 according to a second embodiment is shown. The second embodiment almost corresponds to the first embodiment, the difference being that the contact element 13 is formed with two lugs-shaped protrusions which are arranged side by side and which surround the HF activation switch 7 on the outside (non-contacting). When the HF activation element 7 is manipulated, the contact element 13 or its protrusions come into contact with the HF activation button 15 by a corresponding swinging movement of the inner portion 7A which is beam-shaped, as a result of which exactly one of the two electronic HF activation buttons 15 is sufficient and ensures the contact of the activation face 14 on the side facing the HF activation button 15 with the HF activation button 15.

[0100] On the distal side of the inner portion 7A which is opposite the contact element 13 (in all the above-described embodiments of the HF activation element 7), two reset springs 7D are provided which are spaced apart in the instrument transverse direction, which rest on the second instrument branch 4 on the one hand and on the inner portion 7A which is beam-shaped on the other hand, in order to push the HF activation element 7 back into the (non-contacting) initial position irrespective of which side of the instrument 1 it is manipulated.

[0101] Figure 9A HF activation element 7 with a second rack and pinion gear mechanism 18 according to a third embodiment is shown. The second rack and pinion gear mechanism 18 has a first rack 24 and a second rack 25, which are opposite to each other and in operative connection with each other on distal end sections by means of a pinion 26. On the distal end on which the pinion 26 is located, a return spring 7D acting in proximal direction is respectively arranged on the first rack 24 as well as on the second rack 25. On the further proximal end of the first rack 24 and of the second rack 25, a contact element 13 is provided, which has an activation face 14 in the direction of a HF activation button 15 arranged proximally of the HF activation element 7. The HF activation button 15 is arranged on a circuit board 17. That is, the protruding rack and pinion gear mechanism 18 is provided in the second instrument branch 4, so that the HF activation button 15 is arranged in the proximal direction of the rack and pinion gear mechanism 18. Finally, the manipulation element 7A is present in the form of a crossbar, which protrudes from the second instrument branch on its lateral side and is connected with the pinion. A further identical configured manipulation element (not further presented) is also connected with the pinion and protrudes from the second instrument branch on its opposite lateral side.

[0102] If now the presented manipulation element 7A is moved in proximal direction, one rack 25 is displaced in proximal direction as well, while the other rack 24 is moved in distal direction. Thereby, the contact element 13 experiences a flip motion similar to the previously described embodiments, thereby manipulating the HF contact button 15. Upon release of the manipulation element 7A, the pre-tensioned spring 7D causes the racks 24, 25 to return into their initial position. But in principle, the manipulation element could also be coupled with the rotational axis of the pinion 26, in order to trigger the inverse longitudinal movement of the racks 24, 25 by manually induced rotation of the pinion 26.

[0103] Figure 10 A HF activation element 7 as a slide according to a fourth embodiment is shown. The fourth embodiment is according to a configuration, in which the contact element 13 with the activation face 14 is configured flat instead of bump-shaped. Furthermore, in this case, the laterally lock-shaped inner part 7A is not supported rocker-shaped as in the embodiment according to Figure 8 , but can be supported longitudinally moveable in the second instrument branch 4. Figure 8

[0104] Figure 11A and Figure 11B and 12 A HF instrument 1 is shown, which has a lever 27 as HF activation element 7 on the opposite lateral sides of the instrument respectively. According to Figure 11A , this sixth embodiment of the HF activation element 7 shows a lever 27, which is laterally guided by the second instrument branch 4 and is pivoted parallel to the second instrument branch. Here, on the Figure 11A ​In the middle, the HF instrument 1 is oriented as before Figure 1 However, in Figure 11B the orientation of the HF instrument 1 is reversed, that is to say, the first instrument branch 3 is drawn in the downward direction and the second instrument branch 4 in the upward direction, so that both levers 27 can be presented on opposite sides of the instrument. Due to the almost central arrangement of the HF activation element 7 on the side of the second instrument branch 4 facing the first instrument branch 3, the operation of the levers 27 is identical independently of the orientation of the HF instrument 1.

[0105] Figure 13 The arrangement of the two HF activation buttons 15 and 16 and the lever 27 as HF activation element 7 according to the sixth embodiment is shown within the framework of a schematic diagram. According to Figure 13 , the lever 27 is connected in an anti-rotation manner with a contact rod, which preferably extends along the second instrument branch 4 in the proximal direction. Furthermore, a first HF activation button 15 and a second HF activation button 16 are provided, which are arranged opposite one another in such a way that the contact rod is accommodated between them without contact at first. Now, when the lever 27 presented in solid lines is in the first position (1), in which the contact rod has no contact with the HF activation buttons 15 and 16, and is manipulated from this position in the counterclockwise direction, then the first activation button 15 is pressed by the contact rod. For the case in which the instrument 1 is rotated as presented in Figure 11A and Figure 11B , the lever 27 presented in dashed lines is in its second position (2), which is in the same spatial orientation as the lever 27 presented in solid lines in Figure 13 , in which case the two HF activation buttons 15 and 16 are logically above the lever 27. If this lever 27 presented in dashed lines is now manipulated in the counterclockwise direction, then the contact rod comes into contact with the second HF activation button 16 and thus presses this second HF activation button.

[0106] It is also possible that the two levers 27 exchange their respective presented positions. In this case, the switchability from position (1) to position (2) is preferably achieved by means of a click mechanism between the lever 27 and the contact rod, so that the lever can be perceptibly latched in the defined positions (not shown).

[0107] Figure 14 and Figure 15 A bipolar HF instrument 1 with an HF activation element 7 according to the defined safety concept is shown. The HF instrument 1 is in Figure 14 closed and not latched. In Figure 15 , the HF instrument 1 is closed and latched.

[0108] The inner portion 7A of the HF activation element 7 is supported by a spring element 7E, preferably a compression spring. The spring element 7E is arranged in such a way that the entire HF activation element 7 protrudes or is displaced in the axial direction of its rotational / rocking axis 19 by a certain distance from the instrument branch 4. This is in accordance with Figure 14 causes the activation surface 14, which should be pressed onto the first HF activation button 15, to no longer be able to act in engagement with the HF activation button 15. Thus, the HF activation element 7 cannot be activated when it is manipulated in this displaced position.

[0109] Once the HF instrument 1 is in the closed and latched state, the first instrument branch 3 again pushes the HF activation element 7 against the pretensioning force of the spring element 7E back so that the activation surface 14 can engage with the first and / or second HF activation button 15 and / or 16. This safety concept or safety solution thus essentially provides for a displacement of the HF activation element 7 into a nonfunctional position by the spring force, which is only cancelled when the fully closed position of the two instrument branches 3, 4 has been reached, by the additional first instrument branch 3 pushing the HF activation element 7 back into its functional position.

[0110] Figure 16 and Figure 17 An HF instrument 1 with an HF activation element locking element 28 is shown as an additional safety concept or safety solution. Here, the HF activation element locking element 28 is built into / integrated into the HF instrument 1. Thus, if the user accordingly triggers the HF activation element locking element 28, the user is able to manipulate in the closed and latched state.

[0111] According to Figure 18 and Figure 19 The activation element locking element 28 has a plunger 29, which protrudes from the handle housing of the second instrument branch 4 and which can come into contact with the opposing handle housing of the first instrument branch 3 when the HF instrument 1 is closed. A pin 30 is next to the plunger 29. The pin 30 interacts with a hole 32 in the inner portion 7A of the HF activation element 7 according to Figure 21 In the open state of the HF instrument 1 according to Figure 16 the pin 30 is in the hole 32 and a twisting / rocking / manipulation of the HF activation element 7 is not possible. In the closed state of the HF instrument 1 according to Figure 17 the pin 30 is moved out of the hole 32 by the plunger 29 and a twisting / rocking / manipulation of the HF activation element 7 is possible.

[0112] In order to prevent a twisting of the locking element 28, a hole 33 according to Figure 19The guiding elements 31 in the form of sliding tongues are slidingly supported in corresponding guiding grooves in the second instrument branch 4. In this way it is ensured that the pins 30 can enter the holes 32 when the instrument is opened.

[0113] Figure 22 The distances between the individual components of the HF instrument 1 are shown. Here, in order to avoid confusion between the HF activation element 7 and the blade handling element 5 in use, the HF activation element 7 and the blade handling element 5 are placed at a sufficient distance from one another. It is preferred that the distance from the center of the instrument handling eye 20 to the center of the blade handling element 5 is preferably between 56 and 96 mm, further preferably between 66 and 86 mm and further preferably 76 mm. Furthermore, it is preferred that the distance from the center of the instrument handling eye 20 to the center of the HF activation element 7 is preferably between 22 and 62 mm, further preferably between 32 and 52 mm and further preferably 42 mm.

[0114] Figure 23 The HF activation element 7 is shown with a seal 33. Figure 23 The HF instrument 1 according to the above description is shown, wherein the HF activation element 7 as well as the first and / or second HF activation button 15 and / or 16 is sealed with a TPE seal 33.

[0115] Figure 24 The HF activation button 15 or 16 is shown, wherein the HF activation button 15 or 16 has been sealed or encapsulated from the factory with a cover having a concave, preferably hemispherical, extrusion in the contact area of the HF activation button. Upon contact with the protruding hemisphere 35, the activation face 14 presses on which upon handling of the HF activation element 7, the HF energy is supplied.

[0116] Figure 25 The HF activation element 7 according to Figure 6 is shown with a sealing ring 34. The sealing ring 34 is rolled around the T-shaped contact element 13 on the side facing the inner portion 7A of the HF activation element 7, such that the laterally lock-shaped inner portion 7A and the contact element 13 together with the contact face 14 can be fluid-tightly separated from one another. The sealing ring 34 is preferably an elastomer sealing ring / O-ring.

[0117] Figure 26 and Figure 27 A further alternative embodiment of the HF instrument 1 is shown. Here, the HF instrument 1 is configured according to the preceding figures, wherein the HF activation element 7 is present in a double embodiment. In this case, the two HF activation buttons 7 are at the upper side of the respective instrument branches 3 and 4, i.e. on the upper side and on the lower side of the instrument, while the blade handling element 5 remains at the left and right side of the instrument in line with the previously described embodiments.

[0118] Furthermore, in Figure 27 The catch device 8, in particular the male part 8A, is shown in In order to ensure that the user exerts sufficient closure force in the event of a disconnection of the catch device 8, an additional control means 37 in the form of a button is provided. The control means 37 is connected in "and" logic with the HF activation buttons 15 and / or 16 and must be permanently actuated in order to activate the HF energy.

Claims

1. A bipolar HF instrument (1) having: a jaw portion (2), a first instrument branch (3) and a second instrument branch (4) for grasping tissue, which are arranged and configured to move away from each other in an open state and to move towards each other in a closed state, an HF activation element (7) for activating an HF current supply for sealing tissue, and a blade actuating element (5) for moving a mechanical blade (6) in the jaw portion (2) for cutting tissue, the HF activation element (7) being arranged and configured to be operable identically from both opposite sides of the bipolar HF instrument (1), respectively, the HF activation element (7) having an inner portion (7A) which is swingably, displaceably or pivotably supported orthogonally to a proximal-distal direction on an axis of rotation (19) of the HF activation element (7) in the second instrument branch (4), wherein a side of the inner portion (7A) facing proximally of the bipolar HF instrument (1) has a contact element (13) with an activation face (14) which, upon actuation of the HF activation element (7), contacts at least one first HF activation button (15) and activates the HF current supply, the inner portion (7A) of the HF activation element (7) having a first actuation tab or button (7B) and a second actuation tab or button (7C), wherein the first actuation tab or button (7B) projects laterally at the second instrument branch (4) and the second actuation tab or button (7C) projects on the other side of the second instrument branch (4) opposite the first actuation tab or button (7B), characterized in that the contact element (13) is provided and configured with two side-by-side lugs which extend in the direction of the first HF activation button (15) and between which the first HF activation button (15) is accommodated without contact in an unactuated state. The HF activation element (7) is configured and arranged to be movable proximally upon performing a sealing. The HF activation element (7) is configured and arranged to activate the HF current supply after a first knock activation and to automatically switch off the HF current supply or to manually stop the HF current supply after a second knock activation of the HF activation element (7). The inner portion (7A) is beam-shaped. The HF activation element (7) is provided with an HF activation element locking element (28) in an open state of the bipolar HF instrument (1) to lock actuation of the HF activation element (7). wherein A second HF activation button (16) is provided and arranged parallel to the inner portion (7A) of the HF activation element (7) next to the first HF activation button (15). The first HF activation button (15) and / or the second HF activation button (16) are arranged on a circuit board (17) in the second instrument branch (4) distally but towards the inner portion (7A) of the HF activation element (7) in a proximal direction. ​ ​ 2. The bipolar HF instrument (1) according to claim 1, characterized in that ​ 3. The bipolar HF instrument (1) according to claim 1 or 2, characterized in that ​ 4. The bipolar HF instrument (1) according to claim 1, characterized in that ​ 5. The bipolar HF instrument (1) according to claim 1, characterized in that ​ 6. The bipolar HF instrument (1) according to claim 1, characterized in that ​ 7. The bipolar HF instrument (1) according to claim 6, characterized in that ​ 8. The bipolar HF instrument (1) according to claim 1, characterized in that In the first instrument branch (3) a first rack and pinion gear mechanism (9) is arranged and disposed, wherein an input rack (10) is connected with the blade handling element (5) and an output rack (11) is connected with the mechanical blade (6), wherein the blade handling element (5) is linearly movable from a distal rest position proximally for handling the mechanical blade (6).

9. The bipolar HF instrument (1) according to claim 8, characterized in that The input rack (10) and the blade handling element (5) connected therewith are approximately arranged on a symmetry plane between the first instrument branch (3) and the second instrument branch (4).

10. The bipolar HF instrument (1) according to claim 1, characterized in that The HF activation element (7) is button-shaped or key-shaped.

11. The bipolar HF instrument (1) according to claim 1, characterized in that The blade handling element (5) is lever-shaped.

12. The bipolar HF instrument (1) according to claim 1, characterized in that The blade handling element (5) is arranged and configured to be operable identically from both opposite sides of the bipolar HF instrument (1), respectively.

13. The bipolar HF instrument (1) according to claim 1, characterized in that The bipolar HF instrument has a latching device (8) for achieving a latched state when the instrument branches (3, 4) are closed.

14. The bipolar HF instrument (1) according to claim 2, characterized in that The HF activation element (7) is configured and arranged to be pivotable or movable proximally when performing a seal.

15. The bipolar HF instrument (1) according to claim 3, characterized in that The HF activation element (7) is configured and arranged to automatically disconnect the HF current supply by means of an integrated algorithm.

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