Method for manufacturing a surgical instrument for grasping and / or holding and / or guiding a needle

Abstract

The invention relates to a method for producing a surgical instrument (1) for grasping and / or holding and / or guiding a needle, having the following steps: a) providing a first arm part (10) and a second arm part (10'), wherein the first arm part (10) and the second arm part (10') each have a distal holding claw (30, 30') with a recess and a solder reservoir in the free end of the distal holding claw (30, 30'), b) inserting a hard metal insert (40) into the recess of the distal holding claw (30) of the first arm part (10) and a hard metal insert (40') into the recess of the distal holding claw (30') of the second arm part (10'), c) joining the first arm part (10) and the second arm part (10'), wherein the first arm part (10) and the second arm part (10') are supported in the joined state in relation to one another pivotably at a hinge (20), d) filling the solder reservoir of the first arm part (10) and the solder reservoir of the second arm part (10') with solder, respectively, and e) welding the hard metal insert (40) inserted into the recess of the distal holding claw (30) of the first arm part (10) to the first arm part (10) and the hard metal insert (40') inserted into the recess of the distal holding claw (30') of the second arm part (10') to the second arm part (10') by means of the solder, respectively.

Description

TECHNICAL FIELD

[0001] The invention relates to a method for producing a surgical instrument for grasping and / or holding and / or guiding a needle, in particular a surgical needle. BACKGROUND

[0002] For grasping, holding and guiding a surgical needle, special surgical instruments, in particular surgical needle holders, are used.

[0003] Surgical needle holders have two arm parts which are mirror-inverted with respect to one another and which are supported pivotably with respect to one another at a hinge or hinge point. Usually, the arm parts each have a distal holding claw or clamping claw with a carbide insert. The carbide insert is inserted here in a recess of the holding claw or clamping claw. By means of the carbide insert, the occurrence of galling can be slowed down advantageously. In order to hold the needle without slipping or tilting, the carbide insert can have a cross-shaped profile, wherein the profile can be pressed into the form of a pyramid or ground with a diamond tool into a pyramidal pattern.

[0004] Usually, the carbide insert is connected with the hardened arm part provided for producing the surgical needle holder in a so-called hard soldering method with the use of silver solder. However, it is disadvantageous here that, for the hard soldering, temperatures are required which are problematic in terms of the organizational change and accordingly also in terms of the corrosion resistance. This applies in particular in the case where the arm part is made of a martensitic material. A further disadvantage is that the silver hard solder itself can have a black discoloration over time as a result of the handling of the instrument.

[0005] Alternatively, the carbide insert can be connected with the arm part provided for producing the surgical needle holder during the hardening process in a so-called vacuum high-temperature welding method. However, it is disadvantageous here that, due to the large temperature differences during the hardening process, the different coefficients of thermal expansion of the base material or carrier material for the arm part, usually stainless premium steel, and the carbide for the carbide insert have a significant effect, so that even in the case where the carbide insert is correctly positioned in the recess of the holding claw or clamping claw, a relative movement can occur in the hardening furnace. SUMMARY

[0006] It is the task of the invention to provide a method for producing a surgical instrument for grasping and / or holding and / or guiding a needle, in particular a surgical needle, which partially or completely avoids the disadvantages occurring in methods of this type and which in particular results in a surgical instrument for grasping and / or holding and / or guiding a needle, in particular a surgical needle, having an improved stability and corrosion resistance.

[0007] This task is solved by a method having the features according to independent claim 1. Preferred design solutions of the invention are the subject matter of dependent claims 2 to 13. The wording of all claims is hereby expressly referred to as part of the present description.

[0008] The invention relates to a method for manufacturing a surgical instrument for guiding and / or holding and / or grasping a needle, in particular a surgical needle. The surgical instrument is preferably a surgical needle holder or a surgical forceps. The method has in particular the following steps in chronological order:

[0009] a) providing a first arm part and a second arm part, wherein the first arm part and the second arm part each have a distal holding claw with a recess and a solder reservoir in or in particular in the form of a cavity in a free end of the distal holding claw,

[0010] b) inserting a cemented carbide insert into the recess of the distal holding claw of the first arm part and inserting a cemented carbide insert into the recess of the distal holding claw of the second arm part,

[0011] c) joining or connecting the first arm part and the second arm part, preferably wherein the first arm part and the second arm part are in the joined or connected state pivotably supported relative to each other at a hinge or a hinge point,

[0012] d) filling the solder reservoir of the first arm part and the solder reservoir of the second arm part with solder, respectively, and

[0013] e) welding the cemented carbide insert inserted into the recess of the distal holding claw of the first arm part to the first arm part and welding the cemented carbide insert inserted into the recess of the distal holding claw of the second arm part to the second arm part, respectively, by means of the solder.

[0014] In the meaning of the invention, the term "solder reservoir" is to be understood as a depot, i.e. a storage device or a storage means, which is configured and / or set up to be filled with solder and to store or hold the solder, i.e. to have a stock, after filling.

[0015] In the meaning of the invention, the term "distal" is to be understood as pointing away from or being further away from the center of a human or animal body.

[0016] In the meaning of the invention, the term "proximal" is to be understood as pointing towards or being closer to the center of a human or animal body.

[0017] The invention features in particular by the following advantages:

[0018] By using a solder reservoir integrated in the free end of the distal holding jaw, it is particularly advantageously possible to dose the amount of solder required for the soldering and to control the solder flow during the soldering process. The use of excess solder, cemented carbide inserts with an oversize and solder lot stops is thereby unnecessary.

[0019] The dosing of the solder amount is advantageously determinable via the volume of the solder reservoir. The control of the solder flow is preferably based on capillary action, whereby the solder can be sucked into the solder gap between the inserted cemented carbide insert and the distal holding jaw, wherein the capillary effect is interrupted at the end of the solder gap and the solder does not flow further. Thereby, the problems described at the outset in connection with excess solder and uncontrolled solder flow can be particularly advantageously avoided.

[0020] - Thus, for example, grinding off excess solder and / or protruding cemented carbide inserts is dispensed with. Conversely, for example, a grinding process possible directly after the soldering process can be limited to the removal of the size commensurate and possibly present solder residues between the cemented carbide insert and the distal holding jaw. The amount of high-cost cemented carbide used can thereby be reduced.

[0021] - The method according to the invention is thus distinguished overall by improved process reliability and, in particular, by a reduction in manual working steps. A higher product quality can thereby be achieved.

[0022] - In addition, manufacturing costs can be reduced by avoiding rejects and reducing working outlay.

[0023] - Finally, it is advantageous that, with the aid of the method according to the invention, a more stable surgical instrument for grasping and / or holding and / or guiding a needle can be produced, in that stress peaks and thus the risk of breakage can be reduced by the method.

[0024] In the meaning of the invention, the term "cemented carbide insert" is to be understood as an insert having, in particular consisting of, cemented carbide as its main constituent.

[0025] In the meaning of the invention, the term "cemented carbide" is to be understood as a metal matrix composite, in which a hard material present as small particles is held together by a matrix consisting of a metal or an alloy. Cemented carbides are thereby slightly less hard than pure hard materials, but significantly more tough. On the other hand, they are harder than pure metals, alloys and hardened steels.

[0026] Preferably, the first arm part and the second arm part are mirror-imaged with respect to one another. Preferably, the first arm part has a first gripping part, in particular a first finger opening, at the proximal end, and the second arm part has a second gripping part, in particular a second finger opening, at the proximal end.

[0027] Preferably, the first and the second arm part have a high-grade steel as a base material or as a carrier material, respectively. In particular, the first and the second arm part can consist to a large extent or completely of a high-grade steel, respectively. The high-grade steel is preferably a corrosion-resistant high-grade steel, preferably a corrosion-resistant martensitic high-grade steel, particularly preferably a corrosion-resistant martensitic high-grade steel having the material number 1.4021.

[0028] Preferably, as hard metal insert a hard metal insert is used which has a metal matrix consisting of cobalt and / or nickel and a hard material selected from the group consisting of tungsten carbide (WC), titanium carbide (TiC), titanium nitride (TiN), niobium carbide, tantalum carbide, vanadium carbide and mixtures thereof. In particular, the hard metal insert can have a nickel fraction of from 8 to 20% by weight and a metal carbide fraction, in particular a tungsten carbide fraction, of from 80 to 92% by weight, respectively, based on the total weight of the respective hard metal insert.

[0029] Preferably, the hard metal insert also has a textured surface, in particular a grooved or toothed surface, preferably a surface with a cross-shaped texture and / or a pyramid pattern. Thereby, an anti-tilting and / or anti-slip gripping and / or holding and / or guiding of the needle can be achieved particularly advantageously.

[0030] Furthermore, the hard metal insert can have a circumferential chamfer.

[0031] Particularly preferably, the hard metal insert is manufactured by an end contour- close form process, sometimes referred to as near net shape process, for example with a toothed texture, a circumferential chamfer and a shape complementary to the recess of the distal holding claw.

[0032] The surgical instrument manufactured by means of the method according to the application can have a locking device (latch) in the form of locking arms which extend away from one another in the vicinity of the above-mentioned gripping parts and are directed towards one another. In the closed state of the distal holding claws, the latching hooks of the locking arms can latch into one another in a form-fit manner, so that a thread or a respective needle which is located between the distal holding claws is automatically held fixed. This locking (latch) can be released by the user operating the surgical instrument by pressing the gripping parts further together and moving them slightly apart from one another along the holding claw plane. The surgical instrument and the distal holding claws can then be opened.

[0033] In the design variant of the application, the hard metal insert is inserted form-fit into the recess of the distal holding claw when performing step b). Thereby, a high fitting and positioning accuracy can be achieved. In particular, a displacement of the hard metal insert can be completely or at least largely avoided in this way.

[0034] In another embodiment of the invention, during step b), the nose-shaped fitting section of the carbide insert is placed into a complementary (i.e., shape-complementary) region of the recess of the distal retaining claw and is held shape-fitted by that region. During step e), the nose-shaped fitting section, in principle, allows for displacement between the carbide insert and the arm component or the distal retaining claw (caused by the expansion of the different materials of the base material or carrier material (preferably high-quality steel) of the carbide insert and the arm component). Nevertheless, the nose-shaped fitting section particularly advantageously ensures proper alignment, especially centering, of the carbide insert.

[0035] In another embodiment of the invention, the solder library is designed as a cavity, particularly a slightly elongated or longitudinally extending cavity, especially a channel-shaped cavity. Particularly preferably, the cavity extends in the axial direction of the distal retaining claw. The cavity can, in principle, have a polygonal, particularly triangular, quadrilateral, pentagonal, or hexagonal cross-section. However, preferably, the cavity has a cornerless cross-section, particularly a circular, oval, or elliptical cross-section. In particular, the slightly elongated or longitudinally extending design of the cavity advantageously allows for particularly targeted control of the solder flow during step e).

[0036] In another embodiment of the invention, the cavity has an inner diameter of 0.3 mm to 2 mm, preferably 0.8 mm to 1.2 mm, and / or a length of 4 mm to 15 mm, preferably 7 mm to 12 mm. Particularly advantageously, the amount of solder for performing step e) can be controlled via the inner diameter and / or length of the cavity. Furthermore, the advantages mentioned in the preceding paragraphs suitably apply.

[0037] In another embodiment of the invention, step c) is performed between steps b) and e), and more particularly between steps b) and d).

[0038] To perform step c), for example, the first arm component and the second arm component can be tightened together at the hinge or hinge point by means of threaded parts, especially locking threaded parts.

[0039] In another embodiment of the invention, during step d), the solder magazine is filled with solder via an entry opening constructed at the free end of the distal retaining claw on the end side. For example, a dispensing aid, particularly a syringe, can be used to fill the solder magazine with solder.

[0040] In another embodiment of the invention, step d) is performed between steps b) and e), and more particularly between steps c) and e).

[0041] In a further design of the application, as solder a nickel solder, i.e. a nickel alloy or a nickel containing alloy (according to EN ISO 17672), is used, in particular selected from the group consisting of Ni600, Ni610, Ni612, Ni620, Ni630, Ni631, Ni650, Ni700, Ni710, Ni720, Ni800 and mixtures thereof.

[0042] The nickel solder Ni600 is preferably a nickel alloy having a melting temperature range of 980 °C to 1060 °C, wherein the nickel alloy consists of the following components:

[0043] - 14 wt.-% chromium,

[0044] - 4.5 wt.-% silicon,

[0045] - 3.1 wt.-% boron,

[0046] - 4.5 wt.-% iron,

[0047] - 0.75 wt.-% carbon, and

[0048] - the remainder is nickel and optional impurities.

[0049] The nickel solder Ni610 is preferably a nickel alloy having a melting temperature range of 980 °C to 1070 °C and consisting of the following components:

[0050] - 14 wt.-% chromium,

[0051] - 4.5 wt.-% silicon,

[0052] - 3.1 wt.-% boron,

[0053] - 4.5 wt.-% iron, and

[0054] - the remainder is nickel and optional impurities.

[0055] The nickel solder Ni612 is preferably a nickel alloy having a melting temperature of 1055 °C and consisting of the following components:

[0056] - 15 wt.-% chromium,

[0057] - 3.6 wt.-% boron, and

[0058] - the remainder is nickel and optional impurities.

[0059] The nickel solder Ni620 is preferably a nickel alloy having a melting temperature range of 970 °C to 1000 °C and consisting of the following components:

[0060] - 7 wt.-% chromium,

[0061] - 4.5% by weight of silicon,

[0062] - 3.1% by weight of boron,

[0063] - 3% by weight of iron, and

[0064] - the remainder being nickel and optionally impurities.

[0065] The nickel solder Ni630 is preferably a nickel alloy having a melting temperature range of 980°C to 1040°C and consisting of the following components:

[0066] - 4.5% by weight of silicon,

[0067] - 3.1% by weight of boron, and

[0068] - the remainder being nickel and optionally impurities.

[0069] The nickel solder Ni631 is preferably a nickel alloy having a melting temperature range of 980°C to 1070°C and consisting of the following components:

[0070] - 3.5% by weight of silicon,

[0071] - 1.9% by weight of boron, and

[0072] - the remainder being nickel and optionally impurities.

[0073] The nickel solder Ni650 is preferably a nickel alloy having a melting temperature range of 1080°C to 1135°C and consisting of the following components:

[0074] - 19% by weight of chromium,

[0075] - 10% by weight of silicon, and

[0076] - the remainder being nickel and optionally impurities.

[0077] The nickel solder Ni700 is preferably a nickel alloy having a melting temperature of 875°C and consisting of the following components:

[0078] - 11% by weight of phosphorus, and

[0079] - the remainder being nickel and optionally impurities.

[0080] The nickel solder Ni710 is preferably a nickel alloy having a melting point of 890°C and consisting of the following components:

[0081] - 14% by weight of chromium,

[0082] - 10% by weight of phosphorus, and

[0083] - the remainder being nickel and optionally impurities.

[0084] The nickel solder Ni720 is preferably a nickel alloy having a melting temperature range of 880°C to 950°C and consisting of the following components:

[0085] - 25% by weight of chromium,

[0086] - 10% by weight of phosphorus, and

[0087] - the remainder being nickel and optional impurities.

[0088] The nickel solder Ni800 is preferably a nickel alloy having a melting temperature range of 980°C to 1010°C and consisting of the following components:

[0089] - 7% by weight of silicon,

[0090] - 23% by weight of manganese,

[0091] - 4.5% by weight of copper, and

[0092] - the remainder being nickel and optional impurities.

[0093] According to the application, the above-mentioned nickel solder is particularly preferred, since its melting temperature range or melting temperature is compatible with the temperatures required for the hardening of the arm parts, in particular of the joined arm parts. Thereby, in the execution of step e), the hardening of the arm parts, in particular of the joined arm parts, can particularly advantageously also be achieved at the same time.

[0094] In a further design of the application, in the execution of step e), the solder exits from the solder reservoir respectively from an exit opening of the solder reservoir, which opens into the bottom of the recess of the distal holding claw. Preferably, in the execution of step e), the solder enters from the solder reservoir under the action of capillary forces into the bottom of the recess of the distal holding claw. This in turn leads to the fact that the solder from the solder reservoir can be uniformly distributed in the solder gap constructed between the carbide insert and the distal holding claw without exiting from the solder gap. Furthermore, it can be avoided that the distal holding claws are welded to each other during the execution of step e).

[0095] In a further design of the application, the entry opening and the exit opening are arranged at an acute angle or at a right angle with respect to each other.

[0096] Preferably, for the execution of step e), the arm parts, in particular the joined arm parts, are clamped or suspended by means of the suspension device in such a way that the free end of the distal holding claw with the solder reservoir is oriented upwards. Thereby, the solder can be particularly well distributed in the execution of step e) in the solder gap constructed between the carbide insert and the distal holding claw due to its liquefaction and supported by the force of gravity and preferably capillary action.

[0097] Further preferably, step e) is performed in a vacuum furnace or a protective gas furnace, for example with a hydrogen or argon atmosphere.

[0098] Particularly preferably, step e) is performed in a high-temperature welding method, in particular according to DIN 8593-7.

[0099] In particular, by means of step e) a hardening of the arm part can be achieved in addition. In particular, the arm part or the surgical instrument manufactured by means of the method according to the application can here achieve a hardness HRC (Rockwell hardness) of 42 HRC to 50 HRC. Thus, in particular, no separate hardening step is required before performing step e). This constitutes a (further) simplification of the method flow, whereby in particular time and costs can be saved.

[0100] In a further design of the application, after performing step e), the method comprises a step f) of removing the solder reservoir.

[0101] In a further design of the application, when performing step f), the solder reservoir is removed by respectively breaking a theoretical breaking line or a theoretical breaking point / weak point. The theoretical breaking line or the theoretical breaking point / weak point respectively preferably extends in the circumferential direction of the distal holding claw. Particularly preferably, the theoretical breaking line or the theoretical breaking point / weak point is respectively configured between the free end of the distal holding claw, which has the solder reservoir, and a section of the distal holding claw, which adjoins the free end of the distal holding claw, which is free of the solder reservoir. The theoretical breaking line or the theoretical breaking point / weak point can be designed, for example, as a perforation, a notch or a score. The theoretical breaking line or the theoretical breaking point / weak point advantageously makes it possible to remove the (external) solder reservoir by breaking, simply manually, without the use of additional tools and without the risk of damaging the arm part and thus the surgical instrument to be manufactured.

[0102] Alternatively, when performing step f), the free end of the distal holding claw can be ground away up to the theoretical breaking line or the theoretical breaking point / weak point.

[0103] Furthermore, after step e), in particular after step f), the method can comprise a further step g) of grinding the inserted cemented carbide insert and / or the distal holding claw. Thereby, in particular advantageously, a tolerance difference between the cemented carbide insert and the arm part / distal holding claw can be balanced and in particular possible solder residues can be removed.

[0104] Further advantages and aspects of the application result from the claims and the following description of preferred embodiments of the application, which are explained in accordance with a manufacturing example and in accordance with the drawings and the associated drawing description.

[0105] Example

[0106] Method for manufacturing a surgical needle holder

[0107] The arm part of the surgical needle holder is made from a plate of 5.5 mm thickness consisting of stainless steel (1.4021). Thereafter, recesses for the articulation of the closure (Gelenkschluss) and accordingly in the area of the distal holding claws of the arm part are produced by means of milling. Furthermore, a cavity-shaped solder reservoir is opened in the free end of the distal holding claws by means of drilling.

[0108] A hard metal insert to be inserted into the recess of the distal holding claws is manufactured by means of a shaping process approximating the final contour. The hard metal insert manufactured accordingly has a toothed profile, a surrounding chamfer at the toothed profile and an appropriate outer shape for the insertion into the recess of the distal holding claws, respectively. The respective hard metal insert can be manufactured, for example, by means of pressing or MIM (Metal Injection Molding). Subsequently, the hard metal insert manufactured thus is sintered.

[0109] Subsequently, the hard metal insert is placed into the recess of the distal holding claws with form fit. Thereafter, the arm part is fixed with rivets and locked by means of a locking device.

[0110] For the soldering of the hard metal insert with the arm part, the solder reservoir is filled with a nickel-based high-temperature solder according to EN ISO 17672 by means of a dosing appliance or a syringe. Possible excess solder is removed.

[0111] Subsequently, the surgical needle holder is hung in a hanging device, more precisely in such a way that the free end of the distal holding claws of the arm part is oriented upwards. The needle holder hung thus is introduced into a hardening furnace.

[0112] Subsequently, a vacuum high-temperature soldering step according to DIN 8593-7 is performed. The result here is that not only the soldering of the hard metal insert with the arm part of the surgical needle holder takes place, but also simultaneously the hardening of the base material or carrier material of the instrument, which is stainless steel. The base material or carrier material here reaches a hardness of 42 HRC to 50 HRC.

[0113] Subsequently, the free end of the distal holding claws containing the solder reservoir is removed. The removal of the end takes place by breaking a theoretical breaking line, which is configured in the circumferential direction of the distal holding claws and between the free end containing the solder reservoir and the holding claw section adjoining this free end without solder reservoir.

[0114] Then, the surgical needle holder is ground for balancing the tolerance differences between the hard metal insert and the base material or carrier material of the needle holder and for removing possible solder residues.

[0115] Finally, the surface of the surgical needle holder is subjected to a surface treatment. BRIEF DESCRIPTION OF DRAWINGS

[0116] The following is schematically represented in the figures:

[0117] Figure 1 Embodiment of a surgical instrument which can be manufactured by means of the method according to the application,

[0118] Figure 2 Detail view of the hard metal insert of the preliminary stage of the surgical instrument according to Figure 1 in the unassembled state and of the distal holding claw, and

[0119] Figure 3 Detail view of the hard metal insert of the preliminary stage of the surgical instrument according to Figure 1 in the assembled state and of the distal holding claw. DETAILED DESCRIPTION

[0120] The surgical instrument 1 which is schematically represented in Figure 1 is a surgical needle holder.

[0121] The surgical needle holder has a first arm part 10 and a second arm part 10' which are supported in a pivotable manner with respect to one another at a hinge point 20. Preferably, the first arm part 10 and the second arm part 10' are mirror- image constructed with respect to one another.

[0122] Not only the first arm part 10 but also the second arm part 10' has at its distal end a holding claw 30, 30' (so-called distal holding claw) respectively. The distal holding claws 30, 30' have a hard metal insert 40, 40' respectively. The hard metal inserts 40, 40' are inserted in a form-fitting manner in recesses of the distal holding claws 30, 30' respectively.

[0123] The arm parts 10 and 10' have at their proximal end a gripping part 50, 50' respectively in the form of a finger opening.

[0124] Between the distal holding claws 30, 30' and the two gripping parts 50, 50' there is a locking device 60 which is constructed from two locking arms 62, 64. The first locking arm 62 projects from the first arm part 10 in the direction of the second arm part 10'. The second locking arm 64 projects from the second arm part 10' in the direction of the first arm part 10, so that by means of a latching hook (not represented) which is arranged at the first locking arm 62 and a latching hook 65 which is arranged at the second locking arm 64 it is possible to latch or lock the two locking arms 62 and 64 and thus the surgical needle holder 1. The latching hook of the first locking arm 62 and the latching hook 65 of the second locking arm 64 are here designed in such a way that a form-fitting locking is achieved when the gripping parts 50, 50' are pressed together. The latching hooks can be designed, for example, shark tooth- shaped.

[0125] Figure 2A detailed view of the hard metal insert 40 and the distal holding claw 30 in the preliminary stage of the surgical instrument 1 shown in Figure 1 is shown in the unassembled state.

[0126] The hard metal insert 40 is preferably designed in the form of a platelet and preferably has a cross-shaped texturing 41. Furthermore, the hard metal insert 40 has a nose-shaped form-fitting section 43.

[0127] The distal holding claw 30 has a recess 31 which is complementary to the shape of the hard metal insert 40. In the free end 33 of the distal holding claw 30 a hollow solder reservoir 35 is configured (see Figure 3 ), wherein the exit opening 36 of the solder reservoir 35 opens into the bottom 32 of the recess 31.

[0128] Figure 3 A detailed view of the hard metal insert 40 and the distal holding claw 30 in the preliminary stage of the surgical instrument 1 shown in Figure 1 is shown in the assembled state.

[0129] The solder reservoir 35 is preferably designed as a slightly elongated or channel-shaped cavity which extends in the axial direction of the distal holding claw 30. The solder reservoir 35 has an entry opening 37 at the end side 34 of the free end 33 of the distal holding claw 30 for filling the solder reservoir 35 with solder.

[0130] With regard to further features and advantages of the hard metal insert 40 and the distal holding claw 30, complete reference is made to the description of the Figure 2 .

[0131] Finally, the advantages of the method according to the application should again be summarized as follows: Due to the shaping process close to the final contour, the hard metal insert can already be produced in a tool-dependent manner with the appropriate outer shape and the surrounding chamfer.

Claims

1. A method for manufacturing a surgical instrument (1) for grasping and / or holding and / or guiding a needle, having the following steps: a) providing a first arm part (10) and a second arm part (10'), wherein The first arm part (10) and the second arm part (10') each have a distal holding claw (30, 30') with a recess and a solder reservoir in a free end of the distal holding claw (30, 30'), b) inserting a cemented carbide insert (40) into the recess of the distal holding claw (30) of the first arm part (10) and inserting a cemented carbide insert (40') into the recess of the distal holding claw (30') of the second arm part (10'), c) joining the first arm part (10) and the second arm part (10'), wherein the first arm part (10) and the second arm part (10') are supported in the joined state in relation to one another pivotably at a hinge (20), d) filling the solder reservoir of the first arm part (10) and the solder reservoir of the second arm part (10') with solder, respectively, and e) welding the cemented carbide insert (40) inserted into the recess of the distal holding claw (30) of the first arm part (10) to the first arm part (10) and the cemented carbide insert (40') inserted into the recess of the distal holding claw (30') of the second arm part (10') to the second arm part (10') by means of solder, respectively, wherein after step e) the method further comprises a step f) of removing the solder reservoir.

2. The method of claim 1, wherein, When performing step b), the cemented carbide insert (40, 40') is inserted into the recess of the distal holding claw (30, 30') form-fittingly.

3. The method according to claim 1 or 2, characterized in that, When performing step b), a nose-shaped form-fitting section of the cemented carbide insert (40, 40') is placed into and held form-fittingly by a complementary region of the recess of the distal holding claw (30, 30').

4. The method according to claim 1 or 2, characterized in that, The solder reservoirs are designed as longitudinally extending cavities, respectively.

5. The method of claim 4, wherein, The cavities have an inner diameter of 0.3 mm to 2 mm.

6. The method of claim 1 or 2, wherein, Step c) is performed in time between steps b) and e).

7. The method of claim 1 or 2, wherein, As solder, a nickel solder is used.

8. The method of claim 1 or 2, wherein, When performing step d), the solder reservoirs are filled with solder, respectively, via an entry opening configured at a free end of the distal holding claw (30, 30') on the end side.

9. The method of claim 1 or 2, wherein, Step d) is performed in time between steps b) and e).

10. The method of claim 1 or 2, wherein, When performing step e), the solder exits the solder reservoir, respectively, from an exit opening which opens into a bottom of the recess of the distal holding claw (30, 30').

11. The method of claim 8, wherein, When performing step e), the solder exits the solder reservoir, respectively, from an exit opening which opens into a bottom of the recess of the distal holding claw (30, 30'), wherein the entry opening and the exit opening are arranged at an acute or right angle in relation to one another.

12. The method of claim 1 or 2, wherein, When performing step f), the solder reservoirs are removed, respectively, by a theoretical breaking line or a theoretical breaking point.

13. The method of claim 4, wherein, The cavities are designed with an angle-free cross section.

14. The method of claim 5, wherein, The cavities have an inner diameter of 0.8 mm to 1.2 mm.

15. The method of claim 4, wherein, The cavity has a length of 4 to 15 mm.

16. The method of claim 15, wherein, The cavity has a length of 7 to 12 mm.

17. The method of claim 6, wherein, Step c) is performed in time between steps b) and d).

18. The method of claim 7, wherein, The nickel solder is selected from the group consisting of Ni600, Ni610, Ni612, Ni620, Ni630, Ni631, Ni650, Ni700, Ni710, Ni720, Ni800 and mixtures thereof.

19. The method of claim 9, wherein, Step d) is performed in time between steps c) and e).

20. The method of claim 12, wherein, The theoretical breaking line or the theoretical breaking point is respectively configured in a circumferential direction of the distal holding claw (30, 30').

21. The method of claim 12, wherein, The theoretical breaking line or the theoretical breaking point is respectively configured between a free end of the distal holding claw (30, 30') having the solder reservoir and a section of the distal holding claw (30, 30') adjoining the free end of the distal holding claw (30, 30') without solder reservoir.

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