DE102020119299A1 - Tool for a surgical instrument, endoscopic instrument and method of making a tool - Google Patents

Abstract

The invention relates to a tool for a surgical instrument, in particular for an endoscopic high-frequency instrument, with the tool having two interacting tool parts, with at least one of the two tool parts having a carrier element and an insulating element which is arranged on the carrier element, with at least one recess ( 123, 223, 323, 423, 523, 125, 225, 325, 525) in the carrier element and/or in the insulation element, the insulation element or the carrier element having at least one engagement element (119, 519, 121, 521) engaged in the at least one recess and wherein the at least one engagement element (119, 519, 121, 521) in the at least one recess (123, 223, 323, 423, 523, 125, 225, 325, 525) of a molding material at least partially is surrounded, so that a form fit between the carrier element and the insulating element is formed by means of the mold material. The invention also relates to an endoscopic instrument and a method for producing a tool.

Description

The present invention relates to a tool for a surgical instrument, in particular for an endoscopic high-frequency instrument, the tool having two interacting tool parts and at least one of the two tool parts having a carrier element and an insulating element arranged on the carrier element. Furthermore, the invention relates to an endoscopic instrument and a method for producing a tool for a surgical instrument.

In surgery, high-frequency alternating currents are conducted through body tissue using high-frequency (HF) instruments in order to coagulate and/or remove the tissue. With bipolar HF instruments, two electrodes are brought to the relevant tissue area, which allows the current path in the patient's body to be limited to the tissue area. The two electrodes are often designed as tool parts, such as two interacting jaw parts or scissor blades of the HF instrument. The tool parts that are under HF voltage must be isolated from one another. For this purpose, insulation is generally applied to at least one tool part, which prevents electrical contact with the second tool part when the HF instrument is used. For this purpose, an insulating material is usually applied to the tool part by means of a material connection technique, such as gluing or soldering. However, the resilience of such a connection is limited. Furthermore, such an integral connection is not always suitable for multiple use with subsequent processing, in particular by autoclaving, which can result in a short service life and a high frequency of replacement of the tool or the HF instrument. In the manufacture of a tool for an HF instrument using material-to-material connection techniques, the durability of the connection can also be impaired by any subsequent production steps that can be associated with heating, and a great deal of effort is required for production monitoring in order to to ensure sufficient thermal and mechanical resilience of the tool in surgery.

Out EP 1 488 756 A1 discloses a surgical instrument with a tool, the tool having a carrier and a functional element glued to the carrier, and a contact surface of the carrier rests without a gap on a contact surface of the functional element, so that no adhesive can penetrate between the contact surfaces in this area during bonding. As a result, however, there is also no cohesive connection in the area of the contact surfaces.

In EP 1 153 578 B1 discloses a surgical instrument in the form of scissors or pliers, in which an insulating body made of ceramic is placed against a step of the cutting blade by means of an end edge and engages in a corresponding longitudinal groove of the cutting blade by means of a longitudinal rib, the insulating body being connected by means of a material bond, such as gluing or soldering , permanently connected to the cutting blade.

In DE 10 2005 031 237 A1 describes a blade for scissors for use in minimally invasive surgery, in which a cutting insert made of ceramic material is inserted into a recess in the cutting area of the blade part. In this case, the cutting insert is bonded in the recess by means of a high-temperature-resistant synthetic resin adhesive in a material-to-material connection.

It is the object of the present invention to improve the state of the art. In particular, the object of the invention is to specify an improved tool for a surgical instrument, an endoscopic instrument with such a tool and a method for producing such a tool, in which the disadvantages mentioned above can be avoided as far as possible, in particular in which an increased load capacity or service life is achieved can be achieved.

This object is achieved by a tool according to claim 1, by an endoscopic instrument according to claim 14 and by a method according to claim 15.

Advantageous developments of the invention result from the dependent claims.

A tool according to the invention for a surgical instrument is designed in particular as a surgical, electrosurgical and/or endoscopic tool, preferably as a tool for an endoscopic high-frequency (HF) instrument. For example, the tool may be configured to be movably mounted on a distal (i.e., remote from the user) end of a shaft of an endoscopic instrument and operable from a proximal (i.e., near to the user) end of the shaft. The tool is in particular a holding, grasping, clamping and/or cutting tool, for example the tool of dissecting and/or grasping forceps or electrosurgical scissors.

The tool has two interacting tool parts, the esp special are movable relative to each other, for example both tool parts can be movable or one of the tool parts can be fixed and the other movable. The tool parts are designed, for example, as interacting jaw parts of dissecting or grasping forceps or as scissor blades of surgical scissors. The tool can be designed as a tool for a bipolar HF instrument, with both tool parts being designed as electrodes and insulated from one another, so that when a high-frequency voltage is applied, a circuit is closed via body tissue lying between the two tool parts or adjacent to them. On the other hand, the tool can also be designed as a tool of a monopolar HF instrument, with the tool or at least one tool part being designed as an electrode.

At least one of the two tool parts has a carrier element and an insulating element. The carrier element is in particular a component of the tool part which receives and/or carries the insulation element. The carrier element preferably has a metallic material, for example stainless steel, titanium and/or tantalum, or consists of such a material. The insulation element is in particular a component of the at least one tool part and can have an insulation material or consist of this. The insulating element is preferably designed as a ceramic element. The ceramic element may include or consist of a ceramic material. The ceramic material is in particular a technical ceramic and can be an oxide ceramic, a non-oxide ceramic or also a mixed ceramic, for example the ceramic material is a zirconium oxide ceramic.

The insulation element is at least partially arranged on the carrier element, preferably on such a side or side surface of the carrier element which is directed towards the other of the two tool parts and, for example, when the tool is used, comes into contact with the other tool part, and this side or side surface can be completely or partially cover. The insulating element can serve to ensure the temperature resistance of the tool and is designed for electrical insulation from the other tool part and/or to form a tool surface and/or a tool edge, the tool edge being in particular a hard and/or sharp outer edge on the tool part. The insulation element or ceramic element can be designed, for example, as a ceramic cutting edge of surgical scissors, with the tool edge being a cutting edge.

According to the invention, at least one recess is formed in the carrier element and/or in the insulation element, and the insulation element or the carrier element engages in the at least one recess with at least one engagement element. Thus, the carrier element has at least one recess and the insulation element has at least one engagement element, with the at least one engagement element of the insulation element engaging in the at least one recess of the carrier element, and/or the insulation element has at least one recess and the carrier element has at least one engagement element, with the at least one engagement element of the carrier element engages in the at least one recess of the insulation element. The recess is in particular a space between the carrier element and the insulation element and/or in the insulation element or in the carrier element, in which the at least one engagement element engages, so that it is arranged spatially within the recess or engages through it. For example, at least one recess, into which at least one engagement element engages, can be formed between the carrier element and the insulating element. The engagement element is in particular a protruding component or a projection of the carrier element or the insulation element, which engages in the corresponding recess when the insulation element is arranged on the carrier element. The engagement element is preferably formed in one piece with the insulation element or the carrier element.

According to the invention, the at least one engagement element in the at least one recess is at least partially surrounded by a molded material, so that a form fit is formed between the carrier element and the insulating element by means of the molded material, in particular the form fit is formed in the at least one recess. According to the invention, the at least one recess and the at least one engagement element are designed in such a way and the at least one engagement element engages in the at least one recess and is surrounded by the molded material in such a way that the molded material creates a positive connection between the carrier element and the insulating element . In particular, the at least one recess next to the engagement element is at least partially filled with the molding material.

The molding material is in particular a material that fills a free space and thus forms a mold or a molded body. The molding material can, for example, have been introduced into the at least one recess in a liquid state and, after it has solidified or hardened, the at least one engagement element can have its shape at least partially surrounded and partially or completely fill the at least one recess. As a result, the molding material is in particular a shaping connection means which rests against both the at least one engagement element and the at least one recess and can connect them as a mold connection mediator. A form-fitting connection can thus be created between the carrier element and the insulation element by means of the molded material or the molded body as a further element.

The form fit or the form-fitting connection is created in particular by the interlocking of the connection partners, i.e. the carrier element, the insulation element and the molded material or the molded body, with the molded material or the molded body serving as a connecting element between the carrier element and the insulation element. There can also be a form-fitting connection between the shaped body and the carrier element and/or between the shaped body and the insulating element. With the positive connection, the connection partners and in particular the molded material or the molded body prevent the connection partners from detaching from one another due to a blocking, preferably any movement of the insulation element relative to the carrier element, regardless of the direction of an acting force. Consequently, the carrier element and the insulating element and preferably also the molded material cannot be detached from one another even without force transmission or with an interrupted force transmission.

According to this aspect of the invention, it has been recognized that a form fit can be produced between the carrier element and the insulation element by means of a molded material as a form fit mediator as an alternative or in addition to a materially bonded connection. Here, the molded material at least partially or completely surrounds the at least one engagement element of the carrier element and/or the insulation element, which accordingly engages in the at least one recess of the insulation element and/or the carrier element, and at the same time fills the at least one recess partially or completely. In particular, the molding material engages both the engaging element and the recess and, by being located between the components of the carrier element and the insulating element in the recess, prevents movement between the carrier element and the insulating element.

Due to the fact that a form fit between the carrier element and the insulating element is realized by means of the molded material and the insulating element is thus held in a form-fitting manner on the carrier element, the connection between the insulating element and the carrier element can be subjected to higher loads. Due to the higher resilience of the tool part or both tool parts due to the positive connection, the precision of the tool can be improved, for example a tool according to the invention designed as electrosurgical scissors can have reduced play and improved cutting properties. Furthermore, a longer service life of the tool can be achieved as a result. In addition, a more permanent and high-quality insulation of the carrier element can be ensured, as a result of which a direct flow of current between the two tool parts of the tool can be prevented when used in a bipolar HF instrument. Consequently, the use of the tool for coagulating or removing tissue can be facilitated and damage to the connection between the carrier element and the insulating element due to heating during use of the HF instrument can also be avoided.

It is particularly advantageous that the at least one tool part only has to be covered with the insulating element and connected in a form-fitting manner on the side that faces the other tool part or comes into contact with it. In the case of electrosurgical scissors, for example, this is the inside of one scissor blade. Consequently, it is not necessary to cover the entire surface of the carrier element and the at least one tool part can be designed without an encompassing coating or encapsulation by a ceramic layer. In addition, the thickness of the insulation element can be freely selected and configured flexibly due to the form-fitting connection.

As a rule, only the carrier element of one of the two tool parts has to have such an insulation element in order to achieve sufficient insulation and favorable mechanical properties, such as a permanently sharp tool edge. To further improve the mechanical properties, however, it can also be provided that both tool parts are designed as described above. The tool is preferably autoclavable.

According to preferred embodiments of the invention, the carrier element and/or the insulating element has a second recess, a third recess and/or further recesses and/or a second engagement element, a third engagement element and/or further engagement elements, so that by means of the molding material in the respective Recess in each case a further form fit between the carrier element and the insulating element is formed. The intervention elements are elements are each assigned corresponding recesses into which the engagement elements engage, and the engagement elements are at least partially surrounded by the molded material in the respective corresponding recess, so that in each case a further positive connection is formed between the carrier element and the insulating element. The recesses and the engagement elements can each be designed as described above and, for example, be arranged spaced apart from one another in the direction of a longitudinal extension of the tool part. The resilience and the stability of the connection between the insulation element and the carrier element can be increased by the two or more form fits, and the service life of the tool can thereby be further extended.

The insulation element of the at least one tool part is preferably of flat design. The insulating element can have a smooth surface, for example a cutting surface, in particular on the side facing the other tool part, with the at least one engagement element being arranged on the side of the flat insulating element opposite the smooth surface and preferably being formed in one piece with the insulating element, and with the carrier element has the at least one recess into which the at least one engagement element engages. In this way, a particularly simple and durable configuration of the at least one tool part can be created.

In order to optimally design filling of the recess and engagement of the engagement element in the recess and to improve the form fit, the at least one recess, preferably several recesses, can be designed as a bore, hole, indentation, depression, indentation, breakthrough, gap, groove and/or be designed as a cavity. In the event that the recess is designed to reach through the carrier element, for example as a through hole, opening or gap, the engagement element can engage through the recess. The design of the recess or recesses and their shape can be adapted to the material and/or the shape of the carrier element and the insulation element. In addition, depending on the properties of the molding material and the conditions of the manufacturing process, the volume of the at least one recess and an access path thereto can be selected in a suitable manner for filling with the molding material. The recess can have a constriction or constriction, starting from which the recess widens again in an engagement direction (see below).

In a further preferred embodiment of the invention, the at least one recess is aligned with a respective longitudinal axis in a longitudinal direction of the at least one tool part and/or the carrier element. According to this embodiment, the recess or a plurality of recesses is or are thus elongate and each has or have a longitudinal axis which is or are aligned at least approximately in a longitudinal direction of the at least one tool part, which can also be a longitudinal direction of the carrier element of the tool part . Thus, a single elongate recess or a plurality of spaced-apart recesses can be made along the longitudinal direction, which is the direction of greatest extent of the tool part or the carrier element. Accordingly, the engagement element or the respectively corresponding engagement elements can also be elongate and aligned in the longitudinal direction. As a result, a further improved connection between the carrier element and the insulation element can be achieved.

In order to specifically adapt the amount of molding material and thus the strength of the form fit, the at least one recess is preferably partially or completely filled with the molding material. In particular, a respective space between a surface of a corresponding engagement element that engages in the respective recess and a surface of the recess, ie the corresponding partial area of the surface of the carrier element, can be partially or completely filled with the molding material in the recess or in the several recesses being. In order to enable the tool to be cleaned easily and thoroughly, the at least one recess is preferably filled with the mold material in such a way that an outer surface of the tool part is a continuous, largely smooth surface; for this purpose, for example, one surface of the molding material filled into the recess can end flush with adjacent surfaces of the carrier element and the molding material or the molding formed by it. In particular, the at least one recess can be filled with the molding material in such a way that any remaining inner cavities are closed off from the outside by the molding material.

In further preferred configurations of the tool, the molding material is or has an insulating material, an adhesive material and/or a plastic material.

In this case, the insulating material is in particular a material which prevents electrical conduction and/or heat conduction. A configuration in which the molding material is simultaneously designed as an insulating material or includes such a material can, in addition to the ceramic mate rial as electrical insulation through the insulating material additionally further improves the electrical insulation and consequently redundant electrical insulation can be provided.

The adhesive material is in particular an adhesive which connects materials through surface adhesion (adhesion) and through its internal strength (cohesion). In particular, an adhesive material forms a material connection in which the connection partners are held together by atomic or molecular forces. The adhesive material is in particular a volume-forming adhesive. The adhesive material can be an epoxy resin adhesive, for example. A configuration in which the molded material has or includes an adhesive material means that, in addition to the positive connection, a material connection can be produced between the insulation element and the carrier element, with the molding material also having a material connection, in particular on the walls of the engagement element and/or the recess creates connection.

The soldering material is in particular a connecting material which, in a thermal process with melting of the soldering material, produces a surface alloy on a connection partner and thereby creates a material connection. The soldering material or solder is in particular an easy-melting metal alloy. The soldering material can also be a glass solder. An embodiment in which the molding material is or includes a soldering material can also create a material connection in addition to the form fit.

The plastic material is in particular a material which mainly consists of macromolecules. The macromolecules are in particular natural or synthetic polymers. The plastic material can in particular be a thermoplastic, duroplastic and/or elastomer. The plastic material is in particular a plastic that can be injected, for example, by means of injection molding and/or a castable plastic. A configuration in which the molding material is or comprises a plastic material, in particular an injectable plastic, allows a particularly strong and durable form-fitting connection to be created between the carrier element and the insulating element in a particularly simple manner.

According to a particularly preferred embodiment of the invention, the recess has a constriction or constriction, starting from which the recess widens again in a direction pointing away from the insulating element or in an engagement direction. The engagement direction is a direction in which the engagement element engages in the recess, in particular a direction that is directed transversely to a longitudinal direction of the carrier element or the tool part and transversely to a surface of the insulating element or a direction towards the recess, from a base of the engaging element or, for example, viewed from a surface of the insulating element. More preferably, it can be provided that the engagement element, as seen in the direction of engagement, has an enlargement or a projection that extends transversely to the direction of engagement, which can be arranged beyond the constriction, in particular, as seen in the direction of engagement. In a particularly preferred manner, a rear side of the constriction, viewed in the direction of engagement, can be designed to be beveled, it being possible for the bevel to be directed towards the widening or the projection of the engaging element. The positive connection between the carrier element and the insulating element is created in that the molded material is arranged between the constriction of the recess, in particular between the rear side of the constriction and the extension or the projection of the engagement element, seen in the direction of engagement. As a result, the resilience of the form-fitting connection can be further improved. According to this aspect of the invention, at least one recess is formed in the carrier element and/or the insulation element, which has a constriction when viewed in the direction of engagement, and the insulation element and/or the carrier element has at least one engagement element which has an extension or a projection in the direction of engagement has, wherein the engagement element engages in the at least one recess and between the constriction and the widening or the projection a molding material is arranged. The expansion or the projection can be designed in particular as described below.

The at least one engagement element can advantageously have an undercut. The undercut is formed, for example, by a protruding structural element of the engagement element, which protrudes transversely to the engagement direction from a body of the engagement element that extends in the engagement direction, for example, is columnar in shape. Because the engagement element or a plurality of engagement elements has an undercut or each have an undercut, a specific surface area of the engagement element can be enlarged and an additional space arranged around the undercut for filling with the molding material can be created, with the undercut being surrounded by the molding material can be, on the other hand can be prevented by the undercut in a particularly safe way that the engaging element is movable in the molding material or removable from the molding material. As a result, the form fit can be further improved.

Alternatively or additionally, it can be provided that a transverse dimension of the at least one engagement element increases in the direction of engagement, viewed from the insulation element or from a surface of the insulation element. In particular, the engagement element can have an increasing cross-sectional area into the recess and thereby occupy an increasingly larger space. In particular, the transverse dimension can increase continuously or discontinuously in the direction of the recess, for example the cross section of the engagement element can expand conically. As a result, locking can also be improved and mobility of the engagement element in the mold material can be further restricted, and thus the form fit can be further improved.

In a further preferred embodiment of the tool, the at least one engagement element has an at least partially circumferential bead and/or is hook-shaped. In particular, the bead extends along the surface of the engagement element as a completely or partially circumferential element with a profiled cross-section. The bulge is, for example, a part on the edge of the engagement element that protrudes transversely to the direction of engagement, which edge is located at a free-standing end or on the side of the engagement element pointing away from a surface of the insulating element. The bead can be designed as an annular bead with a round and/or ring-shaped cross section. In particular, the annular bead has a half-round or three-quarter round cross-section. Alternatively or additionally, however, the engagement element can also be hook-shaped and have a curved or angularly curved shape. The surrounding of the engagement element or several engagement elements with the mold material can thus be further improved, as a result of which mobility of the engagement element or the engagement elements in the mold material can be further restricted.

In further advantageous configurations of the tool, the at least one engagement element has a bore, indentation, depression, groove and/or a cavity for receiving the molding material. The bore, indentation, depression, groove or cavity is preferably designed and arranged transversely to the direction of engagement. As a result, not only can the engaging element be surrounded by the mold material from the outside, but also a free space created in the engaging element can also be filled with the mold material, as a result of which the blocking and the form fit can be further improved. This can specifically prevent mobility of the engagement element relative to the carrier element in a specific direction or in additional directions, for example by making one or more bores in an elongated engagement element directed in the longitudinal direction of the carrier element, which are transverse to the longitudinal direction and preferably also transverse runs or run to the engagement direction.

The molding material preferably extends essentially over the entire length of the insulation element. This can correspond to an entire length of the at least one tool part and/or the carrier element or only part of this length. In a particularly preferred manner, in addition to the at least one cutout, the molded material completely or partially fills a gap formed between the insulation element and the carrier element, for example between opposing surfaces of the insulation element and the carrier element. As a result, the strength of the connection between the insulation element and the carrier element can be further increased.

In order to provide a tool that can be operated with high-frequency alternating current, the at least one tool part and/or the carrier element is preferably designed as an electrode. The electrode, in particular the carrier element, consists of an electrical conductor or includes one; the carrier element preferably consists of stainless steel or another metallic material. The electrode can be connected to a supply line via which HF voltage can be supplied. In the case of a bipolar instrument in particular, both tool parts are preferably designed as electrodes which can be connected to a respective electrical supply line. Thus, for example, high-frequency alternating current can be conducted into body tissue via the carrier element as an electrode and this can be heated and/or cut in a targeted manner.

In order to form a cutting tool, the at least one tool part or both tool parts can be formed with a scissors section and a joint section, the scissors section having the insulating element, which is preferably designed as a ceramic element, and the joint section being surrounded by an insulating material. The insulation element or ceramic element can form a cutting edge and possibly a scissor surface of the cutting tool. The carrier element includes the joint ab section, which can be pivoted in a pivot joint of the tool, for example with an axle pin, so that the tool part in question can be pivoted about a pivot axis and in this way interacts with the other tool part, which can be stationary or likewise pivotable, for cutting.

Because the joint section is surrounded by the insulating material, the tool part or the support element designed as an electrode can be electrically insulated from the swivel joint and/or the other tool part, which in particular enables it to be designed as a bipolar instrument. The insulating material surrounding the hinge portion is preferably a different material than the molding material, but may be the same material. The insulating material can in particular be a plastic, for example PEEK.

According to a further aspect of the invention, the object is achieved by an endoscopic instrument, in particular an endoscopic high-frequency instrument, the endoscopic instrument having an elongate shaft which can be inserted into a human or animal body and at its distal end (i.e. remote from the user) the Tool is arranged, wherein the tool is designed as described above. The endoscopic instrument can be designed for use with a rigid or a flexible endoscope and can have a rigid or flexible shaft. In this case, the tool has in particular a pivot joint on which one or both tool parts are pivotably mounted, with a pulling element running inside the shaft, which is connected to one or both pivotable tool parts on the distal side and has an operating element at the proximal end for actuation by a user or user .operator. With the high-frequency instrument, a high-frequency alternating current is conducted into the body via one tool part or both tool parts; In particular, the endoscopic HF instrument is designed as a bipolar instrument, both tool parts being designed as electrodes via which high-frequency alternating current is conducted through body tissue that is to be cut, coagulated or removed. One or more electrical lines for connecting the electrodes to an HF source can run inside the shaft, for which purpose a connection for connecting the HF source can be provided at the proximal end of the instrument. The endoscopic high-frequency instrument is in particular a rotatable, bipolar instrument with, for example, a shaft diameter of 5 mm, 3.5 mm, 2 mm, 1.5 mm or less.

An endoscopic instrument is thus provided which is optimally designed for the use of high-frequency alternating current. Most importantly, electrosurgical scissors are provided that have reduced backlash and improved cutting and RF characteristics. It is particularly advantageous that the form-fit connection of the insulating element with the carrier element of the tool ensures reliable and permanent electrical insulation and also supports a material connection, with the insulation element or ceramic element being prevented from falling off even if the material connection fails. In addition, if the mold material has an insulating material, redundant electrical insulation of the tool and thus of the endoscopic high-frequency instrument can be provided by the insulating element or the ceramic element and the insulating material. As a result, when using the instrument, it can also be ensured that the high-frequency alternating current is only conducted into body tissue that is to be cut, coagulated and/or removed in a targeted manner. The endoscopic instrument is preferably autoclavable.

• - Fertigen eines Trägerelementes eines Werkzeugteils eines Werkzeugs für ein chirurgisches Instrument, wobei das Trägerelement mindestens eine Aussparung und/oder mindestens ein Eingriffselement aufweist,
• - Fertigen eines Isolationselementes des Werkzeugteils, wobei das Isolationselement mindestens ein zu der mindestens einen Aussparung des Trägerelements korrespondierendes Eingriffselement und/oder mindestens eine zu dem mindestens einem Eingriffselement des Trägerelements korrespondierende Aussparung aufweist,
• - Zusammensetzen des Trägerelementes und des Isolationselementes zu einer Baugruppe, so dass das Isolationselement an dem Trägerelement angeordnet ist, beispielsweise dieses an einer Seite zumindest teilweise bedeckt, wobei das mindestens eine korrespondierende Eingriffselement des Isolationselements in die mindestens eine Aussparung des Trägerelementes eingreift und/oder das mindestens eine Eingriffselement des Trägerelementes in die mindestens eine korrespondierende Aussparung des Isolationselementes eingreift, und
• - zumindest teilweises Umspritzen und/oder Auffüllen des Trägerelements oder der Baugruppe mit einem Formmaterial und zumindest teilweises Füllen der mindestens einen Aussparung des Trägerelements und/oder der mindestens einen Aussparung des Isolationselements mit dem Formmaterial zum Ausbilden eines Formschlusses zwischen dem Trägerelement und dem Isolationselement.

According to an additional aspect of the invention, the object is achieved by a method for producing a tool for a surgical instrument, with the following steps:

• - Manufacture of a carrier element of a tool part of a tool for a surgical instrument, the carrier element having at least one recess and/or at least one engagement element,
• - Manufacture of an insulation element of the tool part, the insulation element having at least one engagement element corresponding to the at least one recess of the carrier element and/or at least one recess corresponding to the at least one engagement element of the carrier element,
• - Assembling the carrier element and the insulation element to form an assembly, so that the insulation element is arranged on the carrier element, for example at least partially covering it on one side, with the at least one corresponding engagement element of the insulation element engaging in the at least one recess of the carrier element and/or the at least one engagement element of the carrier element engages in the at least one corresponding recess of the insulation element, and
• - At least partial overmoulding and/or filling of the support element or construction group with a molding material and at least partially filling the at least one recess of the carrier element and/or the at least one recess of the insulating element with the molding material to form a positive connection between the carrier element and the insulating element.

The carrier element, the insulating element and the molding material are preferably designed as described above and are arranged as described above. In particular, the method can be designed in such a way that a tool as described above is produced.

The assembly can be overmoulded or filled in an injection molding tool, for example. Of course, instead of the step of overmoulding or filling, the molding material can also be filled into the at least one recess or the at least one corresponding recess using another method, such as casting or applying adhesive. In particular, the molded material is introduced in the liquid state, with the molded material introduced forming a molded body after solidification or hardening, which creates the positive connection between the carrier element and the insulating element. Depending on the configuration of the method and depending on the type of molding material, the step of assembling can also take place after the step of overmoulding or filling.

It goes without saying that the features mentioned above and those still to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention.

• 1a und 1b eine perspektivische Darstellung eines Ausführungsbeispiels eines endoskopischen Schneidwerkzeuges in zwei Seitenansichten (1a und lb);
• 2a bis 2h ein Ausführungsbeispiel eines Werkzeugteils eines endoskopischen Schneidwerkzeugs sowie Bauelemente des Werkzeugteils in unterschiedlichen Ansichten;
• 3a bis 3f Bauelemente einer alternativen Ausführungsform eines Werkzeugteils eines endoskopischen Schneidwerkzeugs in unterschiedlichen Ansichten;
• 4a bis 4f Bauelemente einer weiteren Ausführungsform eines Werkzeugteils eines endoskopischen Schneidwerkzeugs in unterschiedlichen Ansichten;
• 5a bis 5g Bauelemente einer weiteren Ausführungsform eines Werkzeugteils eines endoskopischen Schneidwerkzeugs in unterschiedlichen Ansichten;
• 6a bis 6f Bauelemente einer weiteren Ausführungsform eines Werkzeugteils eines endoskopischen Schneidwerkzeugs in unterschiedlichen Ansichten;
• 7a bis 7f Bauelemente einer weiteren Ausführungsform eines Werkzeugteils eines endoskopischen Schneidwerkzeugs in unterschiedlichen Ansichten;
• 8a bis 8f Bauelemente einer weiteren Ausführungsform eines Werkzeugteils eines endoskopischen Schneidwerkzeugs in unterschiedlichen Ansichten;
• 9a bis 9e Bauelemente einer weiteren Ausführungsform eines Werkzeugteils eines endoskopischen Schneidwerkzeugs in unterschiedlichen Ansichten;
• 10a bis 10e Bauelemente einer weiteren Ausführungsform eines Werkzeugteils eines endoskopischen Schneidwerkzeugs in unterschiedlichen Ansichten;
• 11a bis 11d Bauelemente einer weiteren Ausführungsform eines Werkzeugteils eines endoskopischen Schneidwerkzeugs in unterschiedlichen Ansichten;
• 12a bis 12e Bauelemente einer weiteren Ausführungsform eines Werkzeugteils eines endoskopischen Schneidwerkzeugs in unterschiedlichen Ansichten;
• 13a bis 13e Bauelemente einer weiteren Ausführungsform eines Werkzeugteils eines endoskopischen Schneidwerkzeugs in unterschiedlichen Ansichten;
• 14a bis 14e Bauelemente einer weiteren Ausführungsform eines Werkzeugteils eines endoskopischen Schneidwerkzeugs in unterschiedlichen Ansichten;
• 15a bis 15e Bauelemente einer weiteren Ausführungsform eines Werkzeugteils eines endoskopischen Schneidwerkzeugs in unterschiedlichen Ansichten.

Further aspects of the invention emerge from the following description of preferred exemplary embodiments and the attached drawing. Show it:

• 1a and 1b a perspective representation of an embodiment of an endoscopic cutting tool in two side views ( 1a and lb);
• 2a until 2h an embodiment of a tool part of an endoscopic cutting tool and components of the tool part in different views;
• 3a until 3f Components of an alternative embodiment of a tool part of an endoscopic cutting tool in different views;
• 4a until 4f Components of a further embodiment of a tool part of an endoscopic cutting tool in different views;
• 5a until 5g Components of a further embodiment of a tool part of an endoscopic cutting tool in different views;
• 6a until 6f Components of a further embodiment of a tool part of an endoscopic cutting tool in different views;
• 7a until 7f Components of a further embodiment of a tool part of an endoscopic cutting tool in different views;
• 8a until 8f Components of a further embodiment of a tool part of an endoscopic cutting tool in different views;
• 9a until 9e Components of a further embodiment of a tool part of an endoscopic cutting tool in different views;
• 10a until 10e Components of a further embodiment of a tool part of an endoscopic cutting tool in different views;
• 11a until 11d Components of a further embodiment of a tool part of an endoscopic cutting tool in different views;
• 12a until 12e Components of a further embodiment of a tool part of an endoscopic cutting tool in different views;
• 13a until 13e Components of a further embodiment of a tool part of an endoscopic cutting tool in different views;
• 14a until 14e Components of a further embodiment of a tool part of an endoscopic cutting tool in different views;
• 15a until 15e Components of a further embodiment of a tool part of an endoscopic cutting tool in different views.

In 1a and 1b an endoscopic cutting tool 101 is shown as an example. This has a first and a second scissor blade 103, 105, which each have a pin hole 127 in a respective joint section 106 (see Fig. 2a) and are each pivotally connected via an axle pin 107 to a fork 109, which thus forms a pivot joint. The fork 109 can be connected to a shaft (not shown) of an endoscopic instrument. In their respective articulated section 106, the scissor blades 103, 105 can be contacted via a notch 108 and via a pin 110 for HF application with an electrical conductor running in the shaft or, to carry out the pivoting movement, can be connected to a pull rod (not shown) which is movably mounted in the shaft ).

The first scissor blade 103 has a carrier element designed as a scissor part 113 and an insulating element which is designed as a ceramic element, namely as a ceramic cutting edge 115, in the exemplary embodiments described below. On an inner side of the first scissor blade 103, which is arranged opposite an inner side of the second scissor blade 105, the scissor part 113 is covered extensively with the exception of a lower edge with the ceramic cutting edge 115 (see in 1b) . An upper edge of the ceramic cutting edge 115 is designed as a cutting edge 116 . On its side facing away from the first scissor blade 103, the second scissor blade 105 has a plurality of transverse grooves or teeth 104, which prevent tissue to be cut being pushed out in the longitudinal direction of the scissor blade 105 (in 1b to the right). The tool is designed as a bipolar tool, with the scissor part 113 or a lower edge of the scissor part 113 and the second scissor blade 105 acting as electrodes. The carrier element of the first scissor blade 103, the second scissor blade 105 and the axle pin 107 and the fork 109 are preferably made of stainless steel.

Details of exemplary configurations of the first scissor blade 103 are explained in more detail below. The second scissor blade can, as in 1a and 1b indicated, be formed in one piece, but can also be configured in a corresponding manner as described below for the first scissor blade 103.

In the 2a until 2h are each a perspective view of a cutting assembly that forms the first scissor blade 103 ( 2a) and components of the cutting assembly, namely a ceramic blade 115 ( 2 B) , a scissors part 113 ( 2c ) and a molded body (insulation 117, 2d ), as well as the scissor blade 103 ( 2e) , the ceramic cutting edge 115 ( 2f) , the scissors part 113 ( 2g) and the insulation 117 ( 2h) .

In 2a the assembled assembly forming the scissor blade 103 is shown. On the side opposite the planar inner side of the ceramic blade 115, the ceramic blade 115 has a protruding boundary edge 129, 131 at each end and a first engagement element 119 and a second engagement element 121 in between (see Fig. 2 B , 2f) . Corresponding to the first engagement element 119 and the second engagement element 121, the scissor part 113 has a first recess 123 and a second recess 125 (see Fig. 2c , 2g) . As in particular in 2f As can be seen, the first engagement element 119 and the second engagement element 121 of the ceramic cutting edge 115 each have a peripheral bead 133 at the end. The scissor part 113 and the insulation 117 that is molded or formed by filling ( 2h) are designed to correspond to the shape of the ceramic cutting edge 115 . Movement of the ceramic cutting edge 115 in the insulation 117 is additionally blocked by the two peripheral edging beads 133 of the first engagement element 119 and the second engagement element 121 . In this case, the peripheral beads 133 are opposite a rear bevel, which surrounds the recesses 123, 125 in each case, so that the shaped body (insulation 117) is supported on the respective peripheral bead 133 and on the bevel; as a result, a particularly firm form fit can be achieved. When assembled, the scissor blade 103 has a largely smooth surface, with gaps being filled with a molding material (insulation 117) and this being flush with the adjacent surfaces of the scissor part 113 or the ceramic blade 115 ( 2a , 2e) .

During assembly, the ceramic cutting edge 115 ( 2 B , 2f) inserted with the first engagement element 119 in the first recess 123 of the scissors part 113 and with the second engagement element 121 in the second recess 125 of the scissors part 113, leaving a gap between an inner wall of the ceramic blade 115 and an inner wall of the scissors part 113. The corresponding direction in which the engaging elements 119, 121 are inserted into the recesses 123, 125 is referred to herein as the engaging direction. The first engaging member 119 and the second engaging member 121 inserted in the first recess 123 and the second recess 125 are each surrounded by a space. Subsequently, the scissors part 113 with the arranged ceramic cutting edge 115 is overmoulded with an insulating material by means of an injection molding tool (not shown), so that the aforementioned free spaces are filled with the insulating material and an overmoulded insulation 117 ( 2d , 2h) in a manufactured cutting assembly (scissors sheet 103, 2a , 2e) exists; likewise here, as in the following examples, the assembly consisting of the scissor part 113 with the ceramic cutting edge 115 can be filled with the insulating material.

The molded body formed by the overmoulded insulation 117 after solidification or curing is in 2d and 2h shown as a component. Due to the shape of the scissor part 113, the overmoulded insulation 117 is guided on the outside from the first engagement element 119 via a non-designated web to the second engagement element 121 and via a further web 126 to the joint section 106. The overmoulded insulation 117 thus represents both a form fit and electrical insulation between the scissors part 113 and the ceramic cutting edge 115 as well as electrical insulation for the joint section 106. The cutting assembly formed as a result has the scissors part 113, the ceramic cutting edge 115 and the overmoulded insulation 117 thus forms the first scissor blade 103. Alternatively, the hinge portion 106 may be surrounded by another material, in particular an insulating material, which may be a plastic material such as PEEK, while the portion of the scissors part 113 adjacent the ceramic blade 115 is surrounded by the molding material, which may be another material; in this case, the web 126 is not necessary, nor is the corresponding recess in the scissors part 113 (see Fig. 2c , 2g) .

A flat intermediate space formed between the ceramic cutting edge 115 and the scissors part 113 is also filled with the insulation 117 (see, for example, 2e) . If the insulation is an adhesive material, an adhesive surface can be enlarged as a result, with which the ceramic cutting edge 115 is additionally bonded to the scissor part 113 . In the further exemplary embodiments, such an intermediate space filled with the insulation 117 can also be provided.

Another embodiment of a ceramic cutting edge 215 is in the 3a until 3f shown, namely in a perspective side view the ceramic cutting edge 215 ( 3a) , a scissor part 213 ( 3b) , the scissors part 213 with arranged ceramic blade 215 in a side view of an outside ( 3c ) and in a side view of an inside ( 3f) as well as a cross section through the scissors part 213 with arranged ceramic cutting edge 215 ( 3d and 3e) ,

According to this embodiment, the ceramic cutting edge 215 has a first undercut element 219 and a second undercut element 221 (see Fig. 3a) . The first undercut element 219 is designed as a hook pointing upwards (see Fig. 3e) and the second undercut element 221 as a downwardly directed hook (see Fig. 3d ) executed. Accordingly, fills in the 3a until 3f (as well as in the following 4a until 15e) overmoulded insulation (not shown) also has a cavity on the inside of the upward hook of the first undercut element 219 and the downward hook of the second undercut element 221, which is formed between the hook and a beveled surface on the outside of the ceramic blade 215 (see Fig . 3d and 3e) . The inside of the scissors part 213 is covered with the ceramic cutting edge 215 with the exception of the joint section 106 ( 3f) .

the 4a until 4f show a further embodiment of a ceramic cutting edge 315, namely in a perspective side view the ceramic cutting edge 315 with a vertical bore ( 4a) , a scissors part 313 ( 4b) , the scissors part 313 with arranged ceramic blade 315 in a side view of an outside ( 4c ) and in a side view of an inside ( 4f) , and cross-sectional representations of the scissors part 313 with arranged ceramic cutting edge 315 ( 4d and 4e)

In this embodiment, the ceramic cutting edge 315 has a first undercut element 319 in the form of an upwardly directed hook and a second undercut element 321 with three perpendicular bores 335 . Correspondingly, a cavity behind the hook of the first undercut element 319 and the three bores 335 of the second undercut element 321 are filled with the material of the overmolded insulation (in 4a until 4f not shown) filled out. This achieves locking in the longitudinal and transverse directions of the scissors part 313 .

the 5a until 5g show a perspective side view of a further embodiment of a ceramic cutting edge 315 with an opening border 337 ( 5a , 5d and 5e) and a scissor part 313 ( 5b) and the scissors part 313 with arranged ceramic cutting edge 315 ( 5c ) and perspective sectional views of the scissors part 313 with the ceramic cutting edge 315 arranged ( 5f and 5g) ,

The ceramic cutting edge 315 has a first undercut element 319 and a second undercut element 321, the first undercut element 319 having a continuous perforation border 337 on its upper side and on one side (see Fig. 5a , 5d and 5e) . The perforation border 337 creates an additional hollow space fill created by the molded insulation, not shown, which rests correspondingly on the edge of the first recess 323 of the scissor part 313. Because of the overmoulded insulation, the ceramic cutting edge 315 retains its electrical insulation properties despite the perforated border 337. The insulation can be connected to the inside of the ceramic cutting edge 315 (in the 5f and 5g the left surface) are flush, so that the inside of the scissor blade 103 (s. 1b) forms a smooth surface.

In 6a until 6f are, according to a further embodiment, a perspective side view of a ceramic blade 315 with longitudinal cavities 339 ( 6a) and a scissor part 313 ( 6b) , the scissors part 313 with arranged ceramic blade 315 in a side view of an outside ( 6c ) and an inside ( 6f) as well as two cross-sectional representations of the scissors part 313 with arranged ceramic cutting edge 315 ( 6d and 6e) shown.

In this embodiment, the ceramic cutting edge 315 has a first undercut element 319 with a cavity 339 and a second undercut element 321 with a cavity 339 ( 6a) ; the cavities 339 can be formed, for example, as bores or as curved cavities extending essentially in the longitudinal direction. Accordingly, in addition to the free space between the ceramic cutting edge 315 and the scissor part 313, the two cavities 339 running longitudinally are filled with the insulation during injection molding or filling. This in turn achieves an additional blocking and a strengthening of the form fit.

Another alternative embodiment is 7a until 7f shown, which is a perspective top view of a ceramic cutting edge 415 with vertical bores 435 ( 7a) , a side view of a scissor part 413 ( 7b) , a side view of an outside of the scissors part 413 with arranged ceramic cutting edge 415 ( 7c ) and an inside ( 7f) as well as two cross-sectional representations of the scissors part 413 with arranged ceramic cutting edge 415 ( 7d and 7e) show.

In this embodiment, the ceramic cutting edge 415, which 7a is shown in plan view, an elongate undercut element 419 with a longitudinal groove 441 and three vertical bores 435 on. The scissor part 413 is designed to correspond to an elongated recess 423 ( 7b) . The elongate undercut element 419 is formed with an increasing cross-section in its longitudinal direction, so that a cavity is formed due to the longitudinal groove 441 (see Fig. 7d ) is enlarged in the longitudinal direction to a joint portion 106 (see Fig. 7e) . As a result, the form fit in the direction of the articulated section 106 is improved due to a larger volume of the insulating material, and a mechanical load in the articulated section 106 is thus adapted.

the 8a until 8f show a further alternative embodiment, each showing a perspective view of a ceramic cutting edge 415 with vertical bores 435 ( 8a) , a scissor part 413 ( 8b) , the scissors part 413 with arranged ceramic blade 415 in side views of an outside ( 8c ) and an inside ( 8f) as well as two cross-sectional representations of the scissors part 413 with arranged ceramic cutting edge 415 ( 8d and 8e) are shown.

The ceramic cutting edge 415 has an elongated undercut element 419 ( 8a) . The elongate undercut element 419 has a notch 443 at one end and six vertical bores 435 at its top. The vertical bores 435 are each designed to be continuous (see Fig. 8d ). Filling the notch 443 and the six vertical holes 435 with the overmolded insulation provides both lateral and vertical locking.

Another embodiment is in 9a until 9e shown where 9a and 9b each show a perspective side view of a ceramic cutting edge 415 with a step 445 or a scissor part 413 and wherein further two side views of an outside ( 9c ) and an inside ( 9e) of the scissors part 413 with the arranged ceramic cutting edge 415 as well as a cross-sectional view of the scissors part 413 with the arranged ceramic cutting edge 415 ( 9d ) are shown.

In this embodiment, the ceramic cutting edge 415 has an elongate undercut element 419 with an elongate step 445 ( 9a) . Furthermore, a locking edge 447 is arranged on the ceramic cutting edge 415 . The scissor part 413 is designed with a corresponding elongated recess 423 ( 9b) . Due to the blocking edge 447 and the subsequent free space under the ceramic cutting edge 415, the scissor part 413 is designed with a lower current-carrying edge (see Fig. 9e) , via which a high-frequency alternating current can be derived. Due to the elongated undercut element 419 with the step 445 running in the longitudinal direction, a free space is formed in the elongated recess 423 both below the step 445 and above and behind the step 445 (see Fig. 9d ) which is filled with the overmolded insulation (not shown).

the 10a until 10e show a perspective side view of another embodiment of a ceramic cutting edge 415 with vertical bores 435 and a locking edge 447 ( 10a) , a scissor part 413 ( 10b) , the scissors part 413 with arranged ceramic blade 415 in two side views of an outside ( 10c ) and an inside ( 10e) as well as a cross-sectional representation of the scissors part 413 with arranged ceramic cutting edge 415 ( 10d ).

In this further alternative of the ceramic cutting edge 415 for a current-dissipating scissor part 413, the ceramic cutting edge 415 has an elongate undercut element 419 with a rectangular or square cross section (see Fig. 10d ) and five vertical holes 435 (see 10a) on. Furthermore, the ceramic cutting edge 415 again has a locking edge 447 .

In 11a until 11d 12 are a side perspective view of another embodiment of a ceramic blade 415 having a notch 443 and a locking edge 447 ( 11a) , a pair of scissors 413 with the arranged ceramic blade 415 in two side views of an outside ( 11b) and an inside ( 11d ), as well as a cross-sectional representation of the scissors part 413 with the ceramic blade 415 arranged ( 11c ) shown.

In this further alternative of the ceramic cutting edge 415 for a current-dissipating scissor part 413 , the ceramic cutting edge 415 has an elongated undercut element 419 with a notch 443 . Furthermore, there is again a locking edge 447 with an adjoining free space on the ceramic cutting edge 415 ( 11a) .

In 12a until 12e Another embodiment is shown, namely a perspective side view of the ceramic cutting edge 515 with two boundary edges 529, 531 ( 12a) , a scissors part 513 ( 12b) , the scissors part 513 with arranged ceramic blade 515 in two side views of an outside ( 12c ) and an inside ( 12e) as well as a cross-sectional representation of the scissors part 513 with arranged ceramic cutting edge 515 and a gap 549 between the ceramic cutting edge 515 and the scissors part 513 ( 12d ).

In this further alternative, a ceramic cutting edge 515 has a first engagement element 519 and a second engagement element 521 as well as a protruding boundary edge 529 and 531 on both ends ( 12a) . The first engagement element 519 and the second engagement element 521 each have a peripheral notch 543, as a result of which an intermediate space 549 is formed on both sides of the notch 543 after the ceramic cutting edge 515 has been arranged on a correspondingly designed scissor part 513 (for the second engagement element 521 in 12d shown). Here, the cavity is guided on both sides of the first engagement element 519 and the second engagement element 521 over the entire height of the ceramic cutting edge 515 and down to the scissor part 513, so that the ceramic cutting edge 515 and the scissor part 513 are spaced apart in this area. In addition, the first engagement element 519 and the second engagement element 521 are designed with an increasing diameter due to the circumferential notch in the direction of engagement or in the direction of the first recess 523 and the second recess 525, so that there is an additional blocking compared to the overmolded insulation, which is not shown .

13a until 13e show a perspective side view of a further embodiment of a ceramic cutting edge 515 with two boundary edges 529, 531 ( 13a) , a scissors part 513 ( 13b) , two side views of an outside ( 13c ) and an inside ( 13e) of the scissors part 513 with arranged ceramic cutting edge 515 as well as a cross-sectional representation of the scissors part 513 with arranged ceramic cutting edge 515 with a further embodiment of a gap 549 between the ceramic cutting edge 515 and the scissors part 513 ( 13d ).

With this alternative to the in 12a until 12e shown embodiment with a space 549 between the ceramic cutting edge 515 and the scissors part 513, the first engagement element 519 and the second engagement element 521 are formed with a circumferential oblique notch 551 ( 13a and 13e) . As a result, the cross section of the first engagement element 519 and the second engagement element 521 consisting of the continuous ceramic cutting edge 515 in the direction of the first cutout 523 and the second cutout 525 is initially continuously widened, and then these have a constant cross section. This form of the first engagement element 519 and the second engagement element 521 also enables locking in the molded insulation (not shown) (see Fig. 13d ) causes. The ceramic cutting edge 515 and the corresponding scissor part 513 are designed in such a way that a lower edge of the scissor part 513 is completely exposed for a power line.

In 14a until 14e are a perspective side view of another embodiment of a ceramic blade 515 ( 14a) , a scissors part 513 ( 14b) , two side views of an outside ( 14c ) and an inside ( 14e) of the scissor part 513 with arranged Ceramic cutting edge 515 and a cross-sectional representation of the scissors part 513 with arranged ceramic cutting edge 515, which has an expanding engagement element ( 14d ), shown.

According to this alternative to 13a until 13e with a fully exposed lower edge of the scissor part 513, the ceramic blade 515 has no boundary edges, and the first engaging element 519 and the second engaging element 521 are in turn surrounded by an oblique notch 551 (see Fig. 14a , 14d ). However, this differs from 13a until 13e the corresponding area of the scissors part 513 directly to the ceramic cutting edge 515 in the area around the first engagement element 519 and the second engagement element 521.

Another embodiment is in 15a until 15e shown, namely in each case in a perspective side view of a ceramic cutting edge 515 ( 15a) and a scissor part 513 ( 15b) , in two side views of an outside ( 15c ) and an inside ( 15e) the scissors part 513 with arranged ceramic cutting edge 515 as well as in a sectional view the scissors part 513 with arranged ceramic cutting edge 515 with an engagement element with a notch and a circumferential bead ( 15d ).

In this further alternative are compared to 14a until 14e the first engagement element 519 and the second engagement element 521 are provided with a semicircular notch 543 and thus have a bead, not designated, at the end, which in turn blocks the form fit by means of the molded insulation (not shown) (see Fig. 15d ) is effected.

Thus, an endoscopic cutting tool for an HF instrument (not shown) is provided with a high stability of the form-fitting connection between the scissors part and the ceramic cutting edge, optimum electrical insulation and a high quality of cut.

For the sake of clarity, not all reference numbers are shown in all figures. Reference symbols not explained in relation to a figure have the same meaning as in the other figures.

Reference List

101

Endoscopic cutting tool

103

scissor blade

104

teeth

105

scissor blade

106

joint section

107

axle pin

108

notch

109

fork

110

pen

113

scissor part

115

ceramic cutting edge

116

cutting edge

117

insulation

119

First engagement element

121

Second engagement element

123

First recess

125

Second recess

126

web

127

pin hole

129

boundary edge

131

boundary edge

133

perimeter bead

213

scissor part

215

ceramic cutting edge

219

First undercut element

221

Second undercut element

223

First recess

225

Second recess

227

pin hole

313

scissor part

315

ceramic cutting edge

319

First undercut element

321

Second undercut element

323

First recess

325

Second recess

327

pin hole

335

vertical drilling

337

breakthrough border

339

cavity

413

scissor part

415

ceramic cutting edge

419

Elongated undercut element

423

Elongated recess

427

pin hole

435

vertical drilling

441

longitudinal groove

443

notch

445

step

447

locking edge

513

scissor part

515

ceramic cutting edge

519

First engagement element

521

Second engagement element

523

First recess

525

Second recess

527

pin hole

529

boundary edge

531

boundary edge

543

notch

549

space

551

notch

QUOTES INCLUDED IN DESCRIPTION

This list of the documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• EP 1488756 A1 [0003]
• EP 1153578 B1 [0004]
• DE 102005031237 A1 [0005]

Claims (15)

Tool for a surgical instrument, in particular for an endoscopic high-frequency instrument, the tool having two interacting tool parts, at least one of the two tool parts having a carrier element and an insulation element which is arranged on the carrier element, characterized in that at least one recess (123 , 223, 323, 423, 523, 125, 225, 325, 525) is formed in the carrier element and/or in the insulation element, the insulation element or the carrier element having at least one engagement element (119, 519, 121, 521) in the at least one recess engages and wherein the at least one engagement element (119, 519, 121, 521) in the at least one recess (123, 223, 323, 423, 523, 125, 225, 325, 525) is at least partially surrounded by a molding material is, so that a form fit between the carrier element and the insulating element is formed by means of the mold material. tool after claim 1 , characterized in that the carrier element and / or the insulating element has a second recess (225, 325, 525), a third recess and / or further recesses and / or a second engagement element (121, 521), a third engagement element and / or more Has or have engagement elements which engage(s) in a respective corresponding recess (225, 325, 525) and which is/are at least partially surrounded by the mold material in the respective corresponding recess (225, 325, 525) or . tool after claim 1 or 2 , characterized in that the insulating element is flat. Tool according to one of the preceding claims, characterized in that the at least one recess (123, 223, 323, 423, 523, 125, 225, 325, 525) is designed as a bore, indentation, depression, opening, groove and/or as a cavity is. Tool according to one of the preceding claims, characterized in that the at least one recess (123, 223, 323, 423, 523, 125, 225, 325, 525) is aligned with a longitudinal axis in a longitudinal direction of the at least one tool part. Tool according to one of the preceding claims, characterized in that the at least one recess (123, 223, 323, 423, 523, 125, 225, 325, 525) is partially or completely filled with the molding material. Tool according to one of the preceding claims, characterized in that the molding material is or comprises an insulating material, an adhesive material, a soldering material and/or a plastics material. Tool according to one of the preceding claims, characterized in that viewed in an engagement direction, the at least one recess (123, 223, 323, 423, 523, 125, 225, 325, 525) has a constriction and the engagement element (119, 519, 121 , 521) has an enlargement or protrusion located beyond the constriction and that the molding material is arranged at least between the constriction and the enlargement or protrusion. Tool according to one of the preceding claims, characterized in that the at least one engagement element (119, 519, 121, 521) has an undercut and/or that a transverse dimension of the at least one engagement element (119, 519, 121, 521) extends from a base of the engagement element (119, 519, 121, 521) and/or that the at least one engagement element (119, 121) has an at least partially circumferential bead (133) and/or is hook-shaped. Tool according to one of the preceding claims, characterized in that the at least one engagement element has a bore (335, 435), depression (443, 543, 551), depression, groove (441) and/or a cavity (339) for receiving the molding material having. Tool according to one of the preceding claims, characterized in that the molding material extends essentially over the entire length of the insulating element. Tool according to one of the preceding claims, characterized in that the at least one tool part and/or the carrier element is designed as an electrode. Tool according to one of the preceding claims, characterized in that the at least one tool part is designed with a scissor section and a joint section (106), the scissor section having the insulating element and the joint section (106) being surrounded by an insulating material. Endoscopic instrument, in particular endoscopic high-frequency instrument, wherein the endoscopic instrument has a shaft with a distal end and a tool is arranged at the distal end, characterized in that the tool is a tool according to one of Claims 1 until 13 is. Method for manufacturing a tool for a surgical instrument, (comprising) with the following steps: - Production of an insulation element with at least one engagement element (119, 519, 121, 521) or with at least one recess, - Production of a carrier element with at least one corresponding recess (123, 223, 323, 423, 523, 125, 225, 325, 525) or with at least one corresponding engagement element, - Assembling the insulation element and the carrier element to form an assembly, so that the insulation element at least partially covers the carrier element on one side and the at least one engagement element (119, 519, 121, 521) of the insulation element fits into the at least one corresponding recess (123, 223, 323, 423, 523, 125, 225, 325, 525) of the carrier element or the at least one corresponding engagement element of the carrier element engages in the at least one recess of the insulation element, and - Overmoulding and/or filling the assembly with a mold material and at least partially filling the at least one recess or the at least one corresponding recess (123, 223, 323, 423, 523, 125, 225, 325, 525) with the mold material to form a Positive locking between the carrier element and the insulating element.

Images