DE202018106126U1 - Hornhauthobel - Google Patents

Abstract

Apparatus for abrading treatment of the cornea, in particular corneal planer with a handle (2) and a blade attachment (5) which can be interchanged on the handle (2), wherein the handle (2) has a grip section (3) and a fastening section (4) arranged on it the blade attachment (5) provides a blade carrier (6) and a blade (7) removably received by the blade carrier (6), the blade carrier (6) being curved formed contact surface (35) for a blade carrier (6) received blade (7), characterized in that the abutment surface (35) of support projections (38) is limited, at which the blade (7) rests edge edge side, wherein the support projections ( 38) have a spacing from each other that exceeds the dimensions of the blade (7) in the direction of spacing.

Description

The invention relates to a device for abrading treatment of cornea, in particular cornea planer, with a handle and an exchangeable can be arranged on the handle blade attachment, wherein the handle has a handle portion and a fastening portion arranged thereon for interchangeable arrangement of the blade attachment to the handle, and wherein the blade attachment provides a blade carrier and an exchangeable from the blade carrier recordable blade, wherein the blade carrier has a curved trained contact surface for a recorded from the blade carrier blade.

A device of the generic type is known from EP 1 216 664 B1 known.

The previously known apparatus for ablation treatment of cornea has a handle and a blade attachment. The blade attachment serves the interchangeable arrangement of a blade and can in turn be interchangeable arranged on the handle.

Even when used as intended, the blade provided by a cornea planer or its cutting edge dulls over time. It is necessary to exchange a used blade for a new one. According to the generic device, it is therefore possible on the user side to be able to separate the blade providing the blade attachment for the purpose of blade replacement of the handle. The blade attachment is interchangeably arranged on the handle in this sense.

To avoid unwanted cuts, it is provided for safety reasons that the sword blade housed by the blade attachment is not to replace a new blade, but the entire blade attachment, including its blade housed. For blade replacement therefore takes place on the user side no direct handling of the blade instead.

The handle in turn has a handle portion and a fastening portion arranged thereon, wherein the attachment portion of the interchangeable arrangement of the blade attachment is used on the handle. In the final assembled state, the blade provided by the blade attachment on the handle side has a cutting edge extending transversely to the longitudinal extent of the handle. This comes in the intended use in operative connection with the cornea to be ablated.

The from the EP 1 216 664 B1 Previously known, corneal planer has, among other things, the advantage that the blade attachment for receiving a blade is formed with two cutting edges. This makes it possible to arrange the blade attachment together with the blade rotated by 180 ° after wear of a first blade of the blade on the handle so that the second blade provided by the blade can be put into use.

Although the from the EP 1 216 664 B1 Prior art device for abrading treatment of cornea has proven in everyday practice, there is room for improvement, especially with regard to an even safer handling by a user. It is therefore an object of the invention to develop a generic device for abrading treatment of cornea to the effect that structurally even safer handling is possible.

To solve this problem, a generic device is proposed with the invention, which is characterized in that the abutment surface is bounded by support projections on which the edge edge edge side rests, wherein the support projections have a spacing from each other, which exceeds the dimensions of the blade in the direction of spacing.

The from the EP 1 216 664 B1 Previously known device for abrading treatment of cornea has a blade attachment with a blade carrier, which provides a curved trained contact surface. At this arched trained contact surface, the blade is in the final assembled state, so they also occupies a curved trained alignment. In this arched trained alignment a blade of the blade is accessible through a corresponding thereto formed recess of the blade carrier through, which allows in the intended use, an ablation treatment of the cornea.

According to the prior art device, the blade locks in its curved orientation in the blade carrier. This has the consequence that the blade is either already on the manufacturer or user side after a first placement of the blade accommodating blade attachment is spent on the attachment portion of the handle in its curved position. This is perceived by the user as disadvantageous because due to the Klinkenverrastung the curved position of the blade is maintained, even if a disassembly of the blade attachment is made by the handle. Because due to the curved position of the blade, there is a danger on the user side even at a decoupled from the handle blade attachment intentionally, to cut unintentionally. This risk of injury exists in particular if Blades with two cutting edges are used and it is provided, after wear of a first cutting the attachment rotated by 180 ° to arrange the handle, so as to be able to take the second cutting edge in use. In such a retooling there is a risk of cuts, since the blade is accessible due to their curved alignment through the recesses in the blade carrier cutting side. This risk of injury is of course not only in a conversion of a prior art device, but whenever a blade attachment is located in latched end position blade of the handle or arranged at this.

The embodiment of the invention provides a remedy. For it is inventively provided that the contact surface on which the blade rests in the intended use case, is limited by supporting projections, which absorb the edge edge edge side between them. These support projections prevent unwanted relative movement between the blade and the blade carrier. In this context, the blade carrier preferably has a recess into which the blade is inserted in the final assembled state. This receptacle provides edge projections supporting projections on which the blade rests.

It is inventively provided that the support projections have a spacing from each other, which exceeds the dimensions of the blade in the direction of spacing. This embodiment has the advantage that the blade is not locked in a curved position relative to the support projections and not remain in its curved position with decoupled blade attachment. The oversizing of the distance between the support projections compared to the blade geometry causes the blade spring-elastic due to a release of the blade attachment from the handle springs back and moved back to its original position in which it is not arched formed on the contact surface of the blade carrier, but rather straight extends within a blade plane.

This embodiment provided according to the invention is particularly advantageous in terms of safety. Because it is so certain that with a user-side removal of the blade attachment from the handle, the blade housed by it moves spring-induced back to its original position, so that a direct access to the edges of the blade-mounted blade is not possible. Unintentional cutting on the blade is thus avoided, which makes the user-side handling safer, especially when replacing the blade attachment.

The blade attachment is replaceable arranged on the handle. This makes it possible to decouple the blade attachment from the handle and rotated by 180 ° to arrange the handle again. A second blade provided by the blade can thus be put into use. If both blades provided by a blade have been used up, the entire blade attachment including the blade housed therein must be replaced to replace the blade. In any case, the embodiment according to the invention causes, in a non-final mounted state of the blade attachment, the blade housed therefrom is not arched but aligned in a straight line. Thus, there is no danger on the user side to be able to cut at the blade. Only at the moment in which the blade attachment is fixed to the handle, effected by the provided by the attachment portion counter-contour pressing the blade against the contact surface of the blade carrier, as a result of which a curvature of the blade, which then allows a proper treatment of the cornea , Conversely, when the blade attachment is separated from the handle, the mating contour provided by the attachment portion of the handle comes out of engagement with the blade, causing a springback of the blade to its initial position, in which position the blades provided by the blade through the corresponding thereto formed recesses of the blade carrier through are not accessible. A dismantled blade attachment can therefore be safely taken on the user side in the hand. The user side gripping a specially trained grip area is not required. Thus, regardless of the user-side handling of the blade attachment a cutting protection for the user is given.

It is provided according to a particular feature of the invention that the blade in the final assembled state handle side has a transverse to the longitudinal extension of the handle cutting edge, wherein the mounting portion and the handle side cutting edge provided by the blade attachment blade are formed free of cover at least in an effective range of the blade.

The after the EP 1 216 664 B1 Previously known device for abrading treatment of cornea has a mounting portion with a head portion, which serves in the final assembled state of the interchangeable arrangement of the blade attachment. This head has a frame with a web which is aligned in directions of the blade cutting edge, that is, in the final assembled state transverse to the longitudinal extent of the handle. This prior art frame design is in advantageously robust and extremely sustainable.

However, it has been found to be disadvantageous that the transverse to the longitudinal extension of the handle web of the frame covering the used in the intended use case cutting a recorded from the blade attachment blade. As a result, it is not possible for a user of the device to be able to see the cutting edge and thus the cornea removed at the moment of the intended use. In other words, the frame bar covers the area of action of the corneal planer unobservable to a user. This is perceived as disadvantageous on the user side, in particular, because it makes handling more difficult and the result of the abducting corneal treatment can not be seen at the moment of ablation, but only after removal has taken place, when the cornea slicer has already moved beyond the treatment area.

In order to counteract this disadvantage, it is now proposed that, in the final assembled state, the fastening section and the handle-side cutting edge of a blade provided by the blade attachment are designed to be free of cover at least in an effective region of the blade. Accordingly, the attachment portion and the blade providing blade attachment are coordinated so that the intended use case on the acting by ablation cornea blade edge is at least partially, that is not covered in an effective range by the attachment portion so that they can be viewed by a user is. Advantageously, such an optical control by the user at the moment of corneal treatment is possible. This facilitates the ablative treatment, which provides a simplified handling.

Overall, such a device for abrading treatment of cornea is provided, which constructively allows a clear view of the cutting edge of the blade which is in operative connection with the cornea at the moment of the treatment of the cornea. This allows visual control of the treatment process by the user of the device. This not only results in a simplified handling, but also the application security is increased in an advantageous manner.

According to a first alternative, it is proposed that the attachment portion comprises a head portion for interchangeable arrangement of the blade attachment on the handle and a neck portion, wherein the neck portion connects the head portion with the handle portion, and wherein the head portion and the neck portion have an integrally merging frame, the encloses a recess with which in the final assembled state, the handle-side edge of a blade provided by the blade blade is at least in an effective range of the blade in registration.

For coverage-free design of mounting portion and cutting a provided by the head part recess is provided according to this alternative. In the final assembled state, the head part carries the blade housing accommodating the blade. In the area where the edge of the blade comes to lie, the head part is equipped with a recess. In the final assembled state, the cutting edge and the recess overlap in an effective region of the blade, so that a free view of the cutting edge of the blade is permitted on the user side due to the recess, at least in sections, that is to say in an effective region of the blade.

According to a second alternative, it is provided that the attachment portion comprises a head portion for interchangeable arrangement of the blade attachment to the handle and a neck portion, wherein the neck portion connects the head portion with the handle portion, and wherein the head portion and the neck portion with the interposition of a transversely to the longitudinal extent of the handle extending web integrally into one another, wherein the web provides a recess with which in the final assembled state, the handle-side edge of a blade provided by the blade blade is at least in an effective range of the blade in registration.

According to this embodiment, the head part has a frame which is bounded on the half-part side by a web. The head part and the neck part are therefore integrally merging with the interposition of the web. So that this web does not obstruct the free view of the cutting edge of the blade attachment provided by the blade, the web provides a recess which is in the final assembled state with the cutting edge of the blade attachment provided blade at least in an effective range of the blade in coverage. A user of the device is thus allowed to see through the cut formed on the web through the cutting edge and thus to an effective range of the blade can.

The blade attachment has a blade carrier on the one hand and a blade on the other hand, wherein the blade carrier in the final assembled state receives the blade. In this case, the blade carrier in already described manner has a curved trained contact surface. At this contact surface, the blade is in the final assembled state, as a result of which the blade is curved.

This configuration serves in particular the user safety in the handling of a separate blade handle from the handle. Because only with operative connection to the handle provided by the blade attachment blade is pressed against the arched trained contact surface of the blade carrier. In this final mounted position, the blades provided by blades are accessible through recesses in the blade carrier in the form of windows. In not final mounted state, so if the blade attachment is not properly attached to the handle, no blade curvature takes place with the consequence that the blades of the blade are covered protected by the blade attachment, so the blades of the blade are not in operative position. This operative position is only reached when the blade is pressed against the arched contact surface of the blade carrier, as a result of which the cutting edges can be reached by corresponding recesses or windows in the blade carrier for ablative treatment.

The head portion of the attachment portion has, according to a further feature of the invention, a corresponding to the curvature of the blade carrier counter-contour. In the final assembled state, this counter contour presses against the blade, which leads to the curvature of the same, as a result of which it comes to rest against the arched contact surface. It is provided so far in accordance with a further feature of the invention that the blade rests in the final assembled state between mating contour and contact surface in a curved position on the contact surface.

It is provided according to a further feature of the invention that the head part has retaining tabs which engage in the final assembled state in provided by the blade carrier recesses, wherein a positive and positive fixing of the blade carrier is provided on the head part. It is guaranteed under all operating conditions safe arrangement of the blade attachment to the handle. In the final assembled state, retaining tabs provided by the fastening section engage through corresponding recesses on the blade attachment. It is thus created a positive connection, which acts in particular in the functional direction of the cornea plane, so that in a proper erosive cornea treatment engaging in the recesses of the blade attachment retaining tabs ensure a secure fit of the blade attachment and represent an abutment for the blade attachment in the functional direction.

The addition given frictional determination causes the blade attachment is held securely even in the non-use case of the cornea plane and does not accidentally detached from the handle. For the purpose of replacing the blade attachment this is deducted against the direction of action of the positive connection of the handle, this has to take place on the user side with the application of a certain force to overcome the frictional connection.

It is provided according to a further feature of the invention that the handle portion is formed of plastic and molded onto the neck portion of the attachment portion. This embodiment proves to be particularly robust and safe over a longer period of use of the device according to the invention. In particular, the injection molding ensures that the fastening section does not unintentionally release from the grip section in the functional direction.

• 1 in schematisch geschnittener Seitenansicht ausschnittsweise eine erfindungsgemäße Vorrichtung, und zwar gemäß Schnittlinie I-I nach 3;
• 2 in schematisch geschnittener Draufsicht eine erfindungsgemäße Vorrichtung, und zwar gemäß Schnittlinie II-II nach 3;
• 3 in schematischer Ansicht ausschnittsweise eine erfindungsgemäße Vorrichtung gemäß einer ersten Ausführungsform;
• 4 in schematischer Ansicht ausschnittsweise eine erfindungsgemäße Vorrichtung gemäß einer zweiten Ausführungsform;
• 5 in schematisch perspektivischer Ansicht einen Klingenaufsatz;
• 6 in schematisch perspektivischer Darstellung eine Handhabe nach der erfindungsgemäßen Vorrichtung gemäß einer ersten Ausführungsform und
• 7 in schematisch perspektivischer Darstellung eine Handhabe nach der erfindungsgemäßen Vorrichtung gemäß einer zweiten Ausführungsform.

Further features and advantages of the invention will become apparent from the following description with reference to FIGS. Showing:

• 1 in a cross-sectional side view schematically a device according to the invention, namely according to section line II 3 ;
• 2 in a schematic top plan view of a device according to the invention, namely according to section line II-II according to 3 ;
• 3 a schematic view of a detail of a device according to the invention according to a first embodiment;
• 4 a schematic view of a detail of a device according to the invention according to a second embodiment;
• 5 in a schematic perspective view of a blade attachment;
• 6 in a schematic perspective view of a handle according to the inventive device according to a first embodiment and
• 7 in a schematic perspective view of a handle according to the device according to the invention according to a second embodiment.

The 1 to 4 each leave in different views a device according to the invention 1 to detect the ablation of cornea, wherein 3 a first embodiment and 4 shows a second embodiment.

The device 1 has a handle 2 on the one hand and a blade attachment 5 on the other hand, the blade attachment 5 replaceable at the handle 2 can be arranged. The 6 and 7 leave two different ones Embodiments of a handle 2 recognize, whereas 5 a blade attachment 5 shows.

The blade attachment 5 in turn has a blade carrier 6 on the one hand and a blade received in the final assembled state thereof 7 on the other hand. This factual relationship is best left 5 detect.

The with the blade attachment 5 in the final assembled state cooperating handle 2 has a handle portion 3 and a mounting portion disposed thereon 4 on.

In this case, the attachment section serves 4 the interchangeable arrangement of the blade attachment 5 at the handle 2 ,

The from the blade attachment 5 housed blade 7 has a cutting edge 34 on, in the final assembled state handle side transverse to the longitudinal extent of the handle 2 runs, as in particular the 3 and 4 reveal.

The attachment section 4 has a headboard 8th and a neck part 9 , It is used in the final assembled state, the headboard 8th the interchangeable arrangement of the blade attachment 5 at the attachment section 4 , The neck part 9 serves to connect the attachment section 4 on the handle section 3 , wherein the handle portion 3 preferably made of plastic and to the neck part 9 of the attachment section 4 is injected.

For exchangeable arrangement of a blade attachment 5 at the attachment section 4 serve two retaining tabs 10 in one of a frame 11 enclosed passage opening 17 protrude, as this particular the 6 and 7 reveal. Here are the tabs 10 formed angled and make two attacks 15 and 16 ready to be in the final assembled state, one from the attachment section 4 according to the purpose recorded blade attachment 5 comes to lie on the edge. This final assembled state results in particular from the illustrations according to the 1 to 4 ,

The blade attachment 5 has already described above a blade carrier 6 in the final assembled state a blade 7 receives. This is best 5 detect.

The blade carrier 6 is preferably made of plastic and has outside grip areas 24 and 25 , which can be grasped on the user side, for example, with two fingers, which allows the blade attachment 5 easy to grip and handle easily and without blade contact. For fastening the blade carrier 6 at the attachment section 4 has the blade carrier 6 over two bridges 20 and 21 , each between two protrusions 26 and 27 respectively. 27 and 28 extend. Below these bridges 20 and 21 are recesses 22 and 23 provided in the form of slots, through which in the final assembled state, the retaining tabs 10 of the attachment section 4 reach through, as in particular the representation according to the 3 and 4 lets recognize.

For a simplified threading of the retaining tabs 10 in the corresponding recesses 22 and 23 have the retaining tabs 10 each over an end face 31 respectively. 32 , each in a bevel 29 respectively. 30 pass. In the final assembled state are the retaining tabs 10 so far in the recesses 22 respectively. 23 used that the the webs 20 and 21 between receiving projections 26 . 27 and 28 adjacent to the retaining tabs 10 to come to rest, with the bars 20 and 21 to the of the retaining tabs 10 Plots 15 and 16 come to lie. This factual relationship is best also derived from the 3 and 4 ,

For the arrangement of a blade attachment 5 at the attachment section 4 is the blade attachment 5 with its projections 26 . 27 and 28 or the webs arranged therebetween 20 and 21 through the passage opening 17 of the attachment section 4 and then the blade attachment 5 in Aufsetzrichtung 18 relative to the attachment section 4 to proceed. As a result, the blade attachment 5 with its recesses 22 and 23 on the retaining tabs 10 threaded up until the footbridges 20 and 21 at the designated attacks 15 and 16 to come to rest.

In a proper use of the device according to the invention 1 this is in functional direction 19 to the Aufsetzrichtung 18 oppositely directed, guided on the user side over a cornea to be ablated. Because the functional direction 19 to Aufsetzrichtung 18 is aligned rotated by 180 °, there is a positive secure hold of the blade attachment 5 through the attachment section 4 ,

The blade attachment 5 has a vaulted formed effective side 33 or a curved trained contact surface 35 for the blade 7 as this particular illustration 2 lets recognize. In the final assembled state, one of the blade attachment 5 housed blade 7 by means of the retaining tabs 10 against the curved trained contact surface 35 pressed. The retaining tabs 10 serve as a counter contour for the contact surface 35 where the blade 7 in the final assembled state between the contact surface 35 and the retaining tabs 10 is arranged. Due to the curved orientation of the blade 7 penetrates the blade 7 with her cutting 34 and 36 in the blade carrier 6 trained windows 37 as this particular illustration 1 lets recognize.

To pick up the blade 7 has the blade carrier 6 via a contact surface-side recess in which the blade 7 comes to rest in the final assembled state. This recess is at the edge by supporting projections 38 limited, indicating a relative positioning of the blade 7 opposite the blade carrier 6 he brings. In the illustrated embodiment, the support projections 38 formed as a continuous marginal edges, where the blade 7 abuts edge edge side. It is inventively provided that the support projections 38 have a spacing from each other that exceeds the dimensions of the blade in the direction of spacing. Due to this configuration it is ensured that no latching of the blade in the final assembled state in relation to the blade carrier 6 takes place. Rather, this design allows the blade 7 spring elastic conditionally spring back to its original position when the blade attachment 5 from the handle 2 is decoupled.

In unassembled position of the blade attachment 5 springs the blade 7 due to the absence of the counter-contour retaining tabs 10 back to their original position, in which they are not arched on the contact surface 35 but lies straight within a blade plane. The cutting 34 and 36 come so out of engagement with the windows 37 with which the cutting edges 34 and 36 the blade 7 protected lie within the blade carrier 6. The user-side handling of a non-final-mounted blade attachment 5 is so sure, as there is no risk of accidental contact with the cutting 34 and 36 the blade 7 consists.

Like a synopsis especially the 3 and 6 with respect to a first embodiment and the 4 and 7 can be seen with respect to a second embodiment, it is provided that in the final assembled state of the attachment portion 4 and the handle side cutting edge 34 one from the blade attachment 5 provided blade 7 at least in one effective range of the blade 7 are formed free of cover. This embodiment provides the advantage that in the intended use case, the cutting edge located in the active use 34 the blade 7 is visible by the user. This allows a visual control at the moment of the intended treatment of the cornea by ablation.

According to the first embodiment of the 3 and 6 is provided that the headboard 8th a frame 11 having, wherein the head part 8th and that for fixing the fixing portion 4 on the handle section 3 provided neck part 9 with interposition of a bridge 14 merge. This jetty 14 is through-hole side with an additional recess 13 equipped. This recess 13 is in final assembled condition with the handle side cutting edge 34 the blade 7 in overlap, so that at least in sections a clear view of the cutting edge 34 is possible on the user side.

According to the second embodiment of the 4 and 7 is the jetty 14 completely eliminated. Accordingly, there is a recess 12 provided in the frame 11 enclosed passage opening 17 merges in one piece. It is created such a comparatively large free area, the user side unobstructed visual insight of the handle side cutting edge 34 the blade 7 allowed, as this particular 4 lets recognize. 7

LIST OF REFERENCE NUMBERS

1

contraption

2

handle

3

handle portion

4

attachment section

5

The blade cartridge

6

blade carrier

7

blade

8th

headboard

9

neck

10

retaining tab

11

frame

12

recess

13

recess

14

web

15

attack

16

attack

17

Through opening

18

touch-down

19

functional direction

20

web

21

web

22

recess

23

recess

24

gripping edge

25

gripping edge

26

head Start

27

head Start

28

head Start

29

bevel

30

bevel

31

front

32

front

33

action side

34

cutting edge

35

contact surface

36

cutting edge

37

window

38

supporting projections

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• EP 1216664 B1 [0002, 0007, 0008, 0010, 0017]

Claims (9)

Apparatus for abrading treatment of the cornea, in particular corneal planer with a handle (2) and a blade attachment (5) which can be interchanged on the handle (2), wherein the handle (2) has a grip section (3) and a fastening section (4) arranged on it the blade attachment (5) provides a blade carrier (6) and a blade (7) removably received by the blade carrier (6), the blade carrier (6) being curved formed contact surface (35) for a blade carrier (6) received blade (7), characterized in that the abutment surface (35) of support projections (38) is limited, at which the blade (7) rests edge edge side, wherein the support projections ( 38) have a spacing from each other that exceeds the dimensions of the blade (7) in the direction of spacing. Device after Claim 1 , characterized in that the fastening portion (4) has a buckle of the blade carrier (6) corresponding counter contour. Device after Claim 2 , characterized in that the blade (7) rests in the final assembled state between the mating contour and contact surface (35) in a curved position on the contact surface (35). Device after Claim 2 or 3 , characterized in that the blade carrier (6) has a recess in the form of a window (37) which in the final assembled state coincides with a cutting edge (34) of a blade (7) accommodated by the blade attachment (5). Device according to one of the preceding claims, characterized in that the blade (7) in the final assembled state handle side has a transverse to the longitudinal extent of the handle cutting edge (34), wherein the mounting portion (4) and the handle-side cutting edge (34) one of the blade attachment ( 5) provided blade (7) are formed free of cover at least in an effective range of the blade (7). Device after Claim 5 , characterized in that the attachment portion (4) comprises a head portion (8) for interchangeable arrangement of the blade attachment (5) on the handle (2) and a neck portion (9), wherein the neck portion (9) the head portion (8) with the Handle portion (3) connects, and wherein the head part (8) and the neck part (9) have an integrally merging frame (11) which encloses a recess (12), in the final assembled state, the handle-side cutting edge (34) one of Blade attachment (5) provided blade (7) at least in an effective range of the blade (7) in overlap. Device after Claim 5 , characterized in that the attachment portion (4) comprises a head portion (8) for interchangeable arrangement of the blade attachment (5) on the handle (2) and a neck portion (9), wherein the neck portion (9) the head portion (8) with the Handle portion (3) connects, and wherein the head part (8) and the neck part (9) with the interposition of a transversely to the longitudinal extent of the handle (2) extending web (14) integrally merge into one another, wherein the web (14) has a recess (13) provides, in the final assembled state, the handle-side cutting edge (34) of the blade attachment (5) provided blade (7) at least in an effective range of the blade (7) in registration. Device according to one of the preceding claims, characterized in that the head part (8) retaining tabs (10) which engage in the final assembled state in the blade carrier (6) provided recesses (22, 23), wherein a positive and positive fixing of the blade carrier (6) is provided on the head part (8). Device according to one of the preceding claims, characterized in that the handle portion (3) made of plastic and molded onto the neck portion (9) of the fastening portion (4).

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