DE102007055417A1 - Surgical forceps comprises handle part comprising two branches pressable against each other, forceps head carried by the handle part, fixing elements and locking means for protecting the elements and the branches against axial displacement - Google Patents

Abstract

The surgical forceps comprises a handle part comprising two branches (4, 5) pressable against each other, a forceps head (20) carried by the handle part, fixing elements (6, 7), and locking means for protecting the fixing elements and the branches against an axial displacement, when the fixing elements are attached on the branches. Each forceps head is a part of the fixing elements fixed on one of the branches and secured at the branches. Alignment members are intended on the fixing elements and branches and guide the fixing elements and the branches, when fixing the elements on the branches. The surgical forceps comprises a handle part comprising two branches (4, 5) pressable against each other, a forceps head (20) carried by the handle part, fixing elements (6, 7), and locking means for protecting the fixing elements and the branches against an axial displacement, when the fixing elements are attached on the branches. Each forceps head is a part of the fixing elements fixed on one of the branches and secured at the branches. Alignment members are intended on the fixing elements and the branches, and guide the fixing elements and the branches, when fixing the fixing elements on the branches in a defined length relative to the branches. For forming a socket connection between the branches and the fixing elements, one of the two parts comprises a receptacle and the other comprises a bearing pin lying in the inner wall. The locking means comprises a projection and a return switch, which is flexibly engaged in the attachment of the fixing element. The receptacle has a window, in which the projection merges at the bearing pin, if the fixing element is attached on the branches, and is surrounded in the area of the window of a stabilization housing. The bearing pin in the range of the locking protuberance comprises a diametric passage and is partitioned into two flexible arms lying next to each other. The alignment members of the branches and the fixing elements are orientation guides, which have a guidance surface, which is present together with the attachment of the fixing element on the branches so that the fixing element guides relative to the branches into the defined position. One of the orientation guides is a spring, so that the guidance surface is flexibly pressed against each other. One of the two orientation guides is an extension of the bearing pin. One of the guidance surfaces is bent relative to the direction of attachment of the fixing elements. Each forceps head is formed as ceramic component with an electrically insulating region (22) from a ceramic material and with a region (21) from an electrically conductive ceramic material, which has electrical conductivity by embedding electrically conductive particles (30-70 vol.%). The electrically insulative region and the electrically conductive region form a monolithic sintered body. The size of the non-conducting ceramic particles and the conductive particles in the electrically conductive ceramic material is 3-50 mu m. Empty spots are arranged between non-conducting ceramic particles and electrically conductive particles in the electrically conductive ceramic material. The size of the empty spots is 0.5-0.6 mu m. An independent claim is included for a holding device for fixing elements of surgical forceps.

Description

The The invention relates to a surgical forceps with a two-spring against each other printable industries comprehensive handle part, of which each wearing a pair of tweezers tip.

surgical Tweezers of this type are used in medical operations in a variety of ways used, partly as pure gripping tools, partly also for coagulation from between the tweezer tips arranged tissue, in this make The tweezer tips are single-pole or bipolar with an electric Voltage source connected.

It is common, the branches of tweezers in one piece form, so that in particular in the medical field, the production cost is relatively high, in particular, this prevents in many cases, surgical To form tweezers as disposable parts.

It Object of the invention, a generic surgical tweezers so to train that the manufacturing cost can be reduced.

These Task is in surgical tweezers described above Type according to the invention thereby solved, that each tweezers tip is part of a slip-on, which Plug-in element attachable to one of the two branches and thus can be fixed to this industry, and that on the slip-on elements and at the branches alignment members are provided, which are the Aufsteckelemente and the industries when attaching the slip-on elements to the branches to steer in a defined position relative to the branches.

On this way, the branches of surgical tweezers are divided into the actual industries that are part of the grip, and in the slip-on elements, which can be attached correctly to the branches are. It is therefore possible in a simple way replace the Aufsteckelemente so that the same Handle part can be used repeatedly, even if the tweezer tips for each New application selected So when the slip-on designed as disposable parts are.

The Plugging the Aufsteckelemente is facilitated by the Alignment members who ensure that the Aufsteckelemente when plugging on the branches in the correct orientation to the industries and this orientation also maintained in the plugged state.

It is particularly advantageous when the formation of a connector between the branches and the slip-on elements of one of the two Parts a socket and the other one in this insertable, on the inner wall having adjacent journal. In this way you get between the socket and the journal a very stable connection, which also has bending moments can absorb well and is the simplest way to produce.

It is still cheap, when locking means are provided which the slip-on and secure the industry against axial displacement if that Plug-on element is attached to the industry.

Especially can the locking means comprise a latching projection and a latching recess, the elastic when attaching the Aufsteckelementes on the industry lock together. The locking means are thus automatically effective, when the slip-on is attached to the industry.

at a particular embodiment is provided that the socket has a window, in which a latching projection dips on the journal, when the slip-on is attached to the industry.

The slip-on may be surrounded by a stabilizing sleeve in the region of the window, so the slip-on sleeve despite the window maintains the necessary strength.

It is advantageous if the bearing pin in the region of the locking projection has a diametrical opening and thereby in two elastic mutually bendable, adjacent arms is divided. The arms can be elastically bent against each other when the slip-on is pushed, and thereby the locking projections on the Poorly pushed radially inward so far that the receptacle over this can slide until the latching projections elastically spring down and engage in the window of the slip-on sleeve.

at a preferred embodiment is provided that the alignment members of the branches and the Aufsteckelementen projecting orientation tongues are, respectively have a guide surface, and that the guide surfaces when plugging the Aufsteckelementes rest on the industry together and thereby the slip-on element relative to the industry in the desired defined position to steer.

Cheap is if at least one of the orientation tongues is resilient is, making the guide surfaces elastic pressed against each other become.

For a connector that has a plug sleeve and a journal, the Orientierungszungen can preferably be located inside the receptacle when the plug-on is attached to the industry.

Thereby The orientation tongues are in the interior of the receptacle against any deformation or damage protected.

A The two orientation tongues can be an extension of the bearing journal.

It is advantageous if the guide surfaces relative are inclined to Aufsteckrichtung the slip-on, so that by this inclination the guide surfaces progressive plugging with an increasing spring force against each other depressed be, as well allows this tendency an orientation of the two parts to each other when plugging.

According to one preferred embodiment of Invention, the tweezer tip is formed as a ceramic component with at least one electrically insulating region of a ceramic material and at least one region made of an electrically conductive ceramic material, which by embedding electrically conductive particles its electrical conductivity receives. In this way, there are both the electrically conductive areas as well as the electrically insulating regions of the tweezer tip uniformly made of ceramic material, d. H. they have similar mechanical and chemical properties, for example a very high compressive strength, a high resistance to Chemicals or low adhesion to adjacent tissue.

The Difficulties with conventional tweezer tips through the meeting of very different materials in the electrically conductive and in the electrically non-conductive Areas can occur by the combination of an electrically insulating ceramic material and an electrically conductive Ceramic material overcome become.

Especially It is advantageous if the electrically insulating and the electric conductive Areas of monolithic sintered bodies form. In this case, the tweezer tip is as uniform body To look at ceramic material, the only area by additives electric conductivity gets the remaining Properties are over the entire volume of the tool due to the uniform ceramic Nature of the material similar or largely identical, the risk of separation in the border area between electrically conductive and electrically insulating areas does not exist.

The ceramic material used may, for example, be Al ₂ O ₃ , and it is favorable if the electrically conductive ceramic material contains TiN as conductive particles, if appropriate also carbon filaments could be embedded in the ceramic material.

It is cheap, when the proportion of electrically conductive particles in the electric conductive Ceramic material is between 30 and 70 percent by volume. By the Proportion of conductive Particles can set the electrical resistance to the desired size It is only essential that the electrically conductive particles homogeneous in the non-conductive Ceramic material are distributed so that electrical bridges between the electrically conductive Particles form, which cause the electrical conductivity.

The Size of not conductive ceramic particles and the conductive particles in the electrically conductive Ceramic material can be between 1 and 100 microns, preferably between 3 and 50 μm. Between non-conductive ceramic particles and the electrically conductive particles can in the electrically conductive Ceramic material may be located voids whose size is preferably between 0.1 and 10 μm, in particular between 0.5 and 5 microns.

The The invention also relates to a holding device for at least one plug-on element surgical tweezers as described above.

A such holding device should enable the user to in a particularly simple manner, the surgical forceps with the slip-on This may be very common in some surgical forceps Small and therefore difficult to handle.

These Task is in a holding device of the above Type according to the invention thereby solved, that the slip-on element in the longitudinal direction pulled out in a receptacle of the holding device is held. In this way you can by approaching the fixture with an inserted into the holding device Aufsteckelement to the Handle element the industry on the one hand and the plug-in element on the other so against each other, that the slip-on is attached to the industry until a axial fixing is done by the locking elements. Then you can the holding device simply to the free end of the slip-on pull off, since the attachment element to the industry by the locking means is held.

It is particularly advantageous if on the holding device side by side two Aufsteckelemente at a distance corresponding to the distance of the undeformed branches of the handle part of the tweezers speaks, are pulled out in the longitudinal direction. It is therefore possible with such a holding device, at the same time postpone both Aufsteckelemente by bringing the holding device to the handle element on the industries and pull out after the complete plugging in the longitudinal direction of the holding device.

The Holding device may have a holding tube, in which the Aufsteckelemente are fixed in frictional engagement, so that the Aufsteckelemente in the area in which they are held in the holding device, well protected are.

The Holding tube can be used in the recording of the holding device, In particular, the receptacle may have a lateral longitudinal slot have, for the insertion of the holding tube elastically expandable is. The holding device can thus again in the simplest way be equipped with new slip-on elements, which are held in a retaining tube in frictional engagement.

The following description of preferred embodiments of the invention used in conjunction with the drawings for further explanation. Show it:

1 a perspective view of a surgical forceps with a handle comprising two branches and two attached to the industries Aufsteckelementen;

2 : an enlarged view of the area A in 1 wherein an attachment is shown in exploded view;

3 a side view of the two Aufsteckelemente, wherein one of the two Aufsteckelemente along line 3-3 in 2 is cut;

3a FIG. 4 is an enlarged sectional view taken in the area C in FIG 3 ;

4 an enlarged detail view of the area B according to 1 wherein an attachment element and a sector are shown in exploded view;

5 : A side view of the surgical forceps in area B according to 1 , where an industry along line 5-5 in 4 is cut;

5a : an enlarged detail view of the area D in 5 ;

6 : A perspective view of the rear end of the handle element of the surgical forceps of 1 with a line 6-6 in 1 cut connector and

7 a holding device with two inserted into this Aufsteckelementen.

The surgical tweezers shown in the drawing 1 includes a handle part 2 with two juxtaposed, mirror-image formed on a connector 3 stored industries 4 . 5 and with two equally trained, on the branches 4 . 5 attached plug-on elements 6 . 7 ,

The industries 4 . 5 consist of a resilient material, such as steel, the connector 3 can be a plastic part, in which the two branches 4 . 5 are cast at a distance from each other so that they are set at their rear end parallel to each other and at a distance to each other. In this area, the two industries 4 . 5 with metallic pins 8th . 9 Be provided to the rear of the connector 3 protrude and can be plugged into the electrical connection sockets, not shown in the drawing. At her the connector 3 facing away from the branches bear a circular cylindrical bearing pin 10 which is at a radially inward jumping step 11 the branches 4 . 5 starts and at his stage 11 opposite end of a guide surface 12 which results from being on one side of the journal 10 one to the middle of the journal 10 reaching level 13 in the journal 10 is arranged. The guide surface 12 is thus located substantially in the center plane of the cylindrical journal 10 and is to the free end of the journal 10 towards this midplane in an investment area 14 inclined, the inclination is on the order of 6 ° to 10 ° ( 3 ).

In its middle section is the journal 10 from a diametrically penetrating longitudinal slot 15 in two parallel arms 16 . 17 divided, these arms 16 . 17 can be elastically bent radially inwards. In the area of the longitudinal slot 15 carries the journal 10 a radially outward annular bead 18 passing on two opposite sides through the longitudinal slot 15 shared.

The journal 10 is with the industry 4 . 5 formed in one piece and, like these, preferably made of a metal which is elastically deformable, for example made of steel.

The two attachment elements 6 . 7 are identical, only one of the two will be explained in more detail below. The slip-on element has a metallic, elongated core 19 on, with a tweezers tip at its free end 20 forms with an inside barrel surface 21 , These tweezers top 20 with the barrel surface 21 Can be integral with the core 19 be formed or as a separate component by soldering or the like to the core 19 connected is.

The tweezers tip 20 is surrounded by an insulating body 22 , which may be made of plastic or ceramic, for example, and the barrel surface 21 leaves free. The tweezers tip 20 can be designed in particular as a ceramic component. There is the barrel area 21 for example, an electrically conductive ceramic material, while the insulating body 22 consists of an electrically insulating ceramic material. The electrically conductive ceramic material may consist, for example, of Al ₂ O ₃ , conductive particles of TiN are added to this ceramic material, and carbon filaments could possibly also be embedded in the ceramic material. The proportion of the electrically conductive particles in the electrically conductive ceramic material may be between 30% by volume and 70% by volume. By the proportion of conductive particles, the electrical resistance can be adjusted to the desired size, it is only essential that the electrically conductive particles are homogeneously distributed in the non-conductive ceramic material, so that electrical bridges between the electrically conductive particles arise, the electrical conductivity cause.

The electrically insulating ceramic material may also be Al ₂ O ₃ .

The core 19 can in the barrel area 21 be embedded and, for example, with the barrel surface 21 be connected by soldering.

The jaw member may be made by preforming it by two-component injection of electrically insulating ceramic material and electrically conductive ceramic material, on the other hand. Subsequently, the jaw part is monolithically solidified by a sintering process, so that the jaw part as a one-piece ceramic part on the core 19 is determined. In this way arise through the insulator 22 on the one hand and by the electrically conductive ceramic material of the barrel surface 21 on the other hand immediately adjacent to each other in the one-piece ceramic part areas that are electrically insulating or electrically conductive. These areas are connected without gaps by the sintering process and are both made of ceramic material.

At his tweezers tip 20 opposite side carries the core 19 an elongated tongue 23 , the off-center from the core 19 outlet and on its inner side at the free end of a guide surface 24 carries, in relation to the longitudinal direction of the Aufsteckelementes 6 slightly tilted, for example, the inclination lies between 0 ° and 2 ° ( 3 ).

At the core 19 is an elongated receptacle 25 attached and permanently connected to the core, for example by soldering. In the illustrated embodiment, the outer diameter of the receptacle 25 equal to the outer diameter of the core 19 , in the attachment area is the diameter of the core 19 in addition to the wall thickness of the socket 25 reset.

The socket 25 is longer than the tongue 23 so that the tongue 23 completely inside the socket 25 is included. The wall of the socket 25 is at one point through two diametrically opposed windows 26 broken through, the wall of the socket 25 forms in the window area 26 only relatively narrow bars 27 out. To increase the stability of the socket 25 in the window area 26 is a stabilization sleeve over this area 28 pushed, which preferably consists of metal and close to the outside of the socket 25 is applied.

The whole core 19 and the subsequent socket 25 Finally, from an insulating sleeve 29 Surrounded by the insulating body 22 to the end of the socket 25 extends, and in the same way are the branches 4 . 5 from an insulating coating 30 covered, stretching to the step 11 extends. On the insulating sleeve 29 is at the end of the socket 25 an insulating piece of pipe 31 attached, which over the end of the socket 25 survives and which when sliding on the on the stage 11 the industry 4 . 5 adjacent region of the isolated coating 30 creates a tight, insulating connection.

Each attachment element 6 . 7 can be with the help of the socket 25 on a journal 10 an industry 4 . 5 slide on, this is the journal 10 with its outer wall close to the inner wall of the socket 25 at. When pushed, the guide surface also lays down 24 the tongue 23 to the appropriate guide surface 12 of the journal 10 on, and thereby are the Aufsteckelemente when sliding 6 . 7 relative to the branches 4 . 5 guided and directed in a defined angular position, the two guide surfaces 12 . 24 lie flat against each other and thus define exactly the angle with respect to the longitudinal axis of the socket 25 between attachment element and industry. This contributes to the tongue 23 is resilient and with an increasing upon sliding of the inclined guide surfaces increasing force the guide surfaces against each other. The Aufschiebebewegung is limited by the fact that the socket 25 at the stage 11 strikes. In this defined end position, the two parts of the annular bead snap 18 in the windows 26 and thus form an axial Verriege ment, which prevents a slip-on 6 . 7 inadvertently from an industry 4 . 5 can be deducted. However, it is possible to remove it if the removal takes place with a force exceeding a certain value.

The user can therefore the slip-on 6 . 7 in a simple way to the industry 4 . 5 slide on, while the slip-on is by the guide surfaces 24 and 12 twisted into the desired angular position, without the user must pay particular attention to it, and by the stop forming a step 11 and the socket 25 the immersion depth is limited. In the end position automatically takes a lock against axial displacement, so that the tweezers is then ready for use.

When pushing on the plug-in element 6 . 7 on the branches 4 . 5 covers the insulating pipe section 31 the gap between the insulating coating 30 on the one hand and the insulating sleeve 29 the Aufsteckelemente other hand, so as to ensure that the tweezers over their entire length with the exception of the barrel surfaces is electrically isolated.

The attachment of the Aufsteckelemente 6 . 7 can be done by hand for each individual attachment element. However, the slip-on elements can possibly be dimensioned relatively small so that the handling can be made more difficult.

In order to simplify the Aufsteckvorgang in this case, a holding device 32 used as in 7 is shown. This holding device 32 comprises a substantially plate-shaped lower part 33 and two up from this base 33 protruding, through a V-shaped gap 34 separate grip elements 35 . 36 , In the plate-shaped lower part 33 are parallel to each other two longitudinal channels 37 . 38 arranged, both to the side over a longitudinal slot 39 . 40 are open. The entire holding device consists of a deformable material, such as a plastic material, so that the longitudinal slots 39 . 40 expandable by the two handle elements 35 . 36 be bent against each other.

The longitudinal channels 37 . 38 form a receptacle for two holding tubes 41 . 42 , which at their ends in each case a radially projecting flange 43 wear, who used in holding tubes 41 . 42 on the front sides of the holding device 32 rests and the holding tubes therefore in the longitudinal channels 37 . 38 stored immovably in the longitudinal direction.

In every holding tube 41 . 42 is in each case a slip-on element 6 . 7 inserted, thereby the slip-on elements 6 in the holding tubes 41 held in frictional engagement, so that the two attachment elements 6 . 7 in the holding device 32 are mounted at a distance from each other and parallel to each other, with a mutual distance, the distance between the two branches 4 . 5 the tweezers 1 matches if the industries 4 . 5 not bent against each other. It is therefore easily possible, the two industries 4 . 5 so to the ends of the slip-on elements 6 . 7 to push in that both Aufsteckelemente 6 . 7 at the same time on the branches 4 . 5 can be deferred.

After locking the slip-on elements 6 . 7 with the branches 4 . 5 can the Aufsteckelemente 6 . 7 by a pull on the handle part 2 from the holding device 32 pulled out, the tweezers is then ready for use.

When plugging in an orientation of the Aufsteckelemente inevitably 6 . 7 relative to the branches 4 . 5 made, on the one hand by the leadership of the journal 10 inside the socket 25 and on the other by the plant of the guide surfaces 24 and 12 the tongue 23 or the journal 10 ,

The holding tubes 41 can then again with plug-on elements 6 . 7 be fitted, which are simply inserted into the holding tubes, so that the holding device then for a re-fitting of a handle element and the branches held thereon 4 . 5 is available.

Claims (26)

Surgical tweezers with a handle part comprising two spring-pressure sectors, each of which carries a tweezer tip, characterized in that each tweezers tip ( 20 ) Part of a slip-on element ( 6 . 7 ) is which plug-on element ( 6 . 7 ) to one of the two branches ( 4 . 5 ) and thereby in this industry ( 4 . 5 ) and that on the Aufsteckelementen ( 6 . 7 ) and the branches ( 4 . 5 ) Alignment members ( 12 . 24 ) are provided, which the Aufsteckelemente ( 6 . 7 ) and the industries ( 4 . 5 ) when attaching the Aufsteckelemente ( 6 . 7 ) on the industries ( 4 . 5 ) in a defined position relative to the sectors ( 4 . 5 ) to steer. Tweezers according to claim 1, characterized in that to form a plug connection between the branches ( 4 . 5 ) and the slip-on elements ( 6 . 7 ) one of the two parts of a socket ( 25 ) and the other one in this insertable, bearing against the inner wall bearing pin ( 10 ) having. Tweezers according to one of claims 1 or 2, characterized in that locking means ( 26 . 18 ) are provided, which the slip-on ( 6 . 7 ) and the industry ( 4 . 5 ) against axial displacement when the slip-on element ( 6 . 7 ) on the industry ( 4 . 5 ) is attached. Tweezers according to claim 3, characterized in that the locking means a latching projection ( 18 ) and a latch return ( 26 ), which when plugging the Aufsteckelementes ( 6 . 7 ) on the industry ( 4 . 5 ) elastically lock together. Tweezers according to claim 1 and claim 4, characterized in that the socket ( 25 ) a window ( 26 ), in which a latching projection ( 18 ) on the journal ( 10 ), when the slip-on element ( 6 . 7 ) on the industry ( 4 . 5 ) is attached. Tweezers according to claim 5, characterized in that the slip-on sleeve ( 25 ) in the area of the window ( 26 ) of a stabilization sleeve ( 28 ) is surrounded. Tweezers according to one of claims 5 or 6, characterized in that the bearing journal ( 10 ) in the region of the latching projection ( 18 ) a diametrical opening ( 15 ) and thereby in two elastically against each other bendable, adjacent arms ( 16 . 17 ) is divided. Tweezers according to one of the preceding claims 5 or 6, characterized in that the alignment members of the branches ( 4 . 5 ) and the slip-on elements ( 6 . 7 ) above orientations ( 10 . 23 ), each having a guide surface ( 12 . 24 ), and that the guide surfaces ( 12 . 24 ) when attaching the Aufsteckelementes ( 6 . 7 ) on the industry ( 4 . 5 ) abut each other and thereby the plug-on element ( 6 . 7 ) relative to the industry ( 4 . 5 ) in the desired defined position. Tweezers according to claim 8, characterized in that at least one of the orientation tongues ( 23 ) is resilient, so that the guide surfaces ( 12 . 24 ) are pressed elastically against each other. Tweezers according to one of claims 8 or 9, characterized in that the orientation tongues ( 23 ) in a plug connection which has a plug-in sleeve ( 25 ) and a journal ( 10 ), inside the socket ( 25 ), when the slip-on element ( 6 . 7 ) on the industry ( 4 . 5 ) is attached. Tweezers according to claim 10, characterized in that one of the two orientation tongues an extension of the journal ( 10 ). Tweezers according to one of claims 8 to 11, characterized in that at least one of the guide surfaces ( 12 . 24 ) relative to the mounting direction of the Aufsteckelemente ( 6 . 7 ) is inclined. Tweezers according to one of the preceding claims, characterized in that each tweezer tip is formed as a ceramic component with at least one electrically insulating region ( 22 ) of a ceramic material and having at least one area ( 21 ) of an electrically conductive ceramic material, which receives its electrical conductivity by embedding electrically conductive particles. Tweezers according to claim 13, characterized in that the electrically insulating regions ( 22 ) and the electrically conductive areas ( 21 ) form monolithic sintered bodies. A surgical instrument according to any one of claims 13 or 14, characterized in that the electrically conductive ceramic material as conductive Contains particles of TiN. Tweezers according to claim 15, characterized that the proportion of electrically conductive particles in the electric conductive Ceramic material between 30% by volume and 70% by volume lies. Tweezers according to one of claims 13 to 16, characterized that size is not conductive ceramic particles and the conductive particles in the electrically conductive Ceramic material between 1 μm and 100 μm lies. Tweezers according to claim 17, characterized that size is not conductive ceramic particles and the conductive particles in the electrically conductive Ceramic material between 3 μm and 50 μm lies. Tweezers according to one of claims 13 to 18, characterized that between non-conductive ceramic particles and electrically conductive particles in the electrically conductive Ceramic material voids are arranged. Tweezers according to claim 19, characterized that the size of the blanks between 0.1 μm and 10 μm lies. Tweezers according to claim 20, characterized that the size of the blanks between 0.5 μm and 6 μm lies. Holding device for at least one slip-on element ( 6 . 7 ) of a surgical forceps ( 1 ) according to any one of the preceding claims, characterized characterized in that the slip-on element ( 6 . 7 ) in the longitudinal direction in a receptacle ( 37 . 38 ) of the holding device ( 32 ) is held. Holding device according to claim 22, characterized in that in it side by side two Aufsteckelemente ( 6 . 7 ) at a distance equal to the distance of undeformed branches ( 4 . 5 ) of the handle part ( 2 ) of tweezers ( 1 ), are pulled out in the longitudinal direction. Holding device according to one of claims 22 or 23, characterized in that the holding device ( 32 ) a holding tube ( 41 . 42 ), in which the slip-on elements ( 6 . 7 ) are fixed in frictional engagement. Holding device according to claim 24, characterized in that the holding tube ( 41 . 42 ) into the recording ( 37 . 38 ) of the holding device ( 32 ) can be used. Holding device according to claim 25, characterized in that the receptacle ( 37 . 38 ) a lateral longitudinal slot ( 39 . 40 ), which is for inserting the holding ear ( 41 . 42 ) is elastically expandable.