CN115040195A

CN115040195A - Adjustable limit coating spatula

Info

Publication number: CN115040195A
Application number: CN202210470657.9A
Authority: CN
Inventors: 杜俊杰; 张红星; 谢泊文; 杨丰源; 张振宇; 田金萍
Original assignee: Air Force Specialty Medical Center of PLA
Current assignee: Air Force Specialty Medical Center of PLA
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-09-13

Abstract

The invention discloses an adjustable limited-coating spatula, which belongs to the technical field of medical instruments and comprises a scraping piece, a supporting piece, an adjusting assembly and a handle, wherein the scraping piece comprises a spatula part for scraping tissues; the supporting piece is rotationally connected with the scraping piece; the adjusting assembly is connected with the scraping piece and the supporting piece at the same time and used for adjusting an included angle between the scraping piece and the supporting piece, the adjusting assembly comprises an adjusting knob, and the included angle between the scraping piece and the supporting piece is controlled by controlling the rotating angle of the adjusting knob; the handle is connected with one end of the supporting piece far away from the scraping piece. The adjustable limited-coating spatula provided by the invention solves the problems that the structure is inflexible, a doctor needs to continuously adjust the operation posture and the standing position according to the corresponding position and the operation body position of a patient when the adjustable limited-coating spatula is used, the operation time is long, the operation intensity of the doctor is high, the physical consumption is high, and the operation process is extremely difficult, has obvious effect, and is suitable for wide popularization.

Description

Adjustable limit coating spatula

Technical Field

The invention relates to the technical field of medical instruments, in particular to an adjustable limited-coating spatula.

Background

The cartilage end plate of the intervertebral disc becomes thinner, calcified and incomplete with age, and cystic degeneration and chondrocyte necrosis occur, the attachment point of the annulus fibrosus is loosened, and the cartilage end plate cannot be regenerated and repaired along with the decrease of water content of the nucleus pulposus. Degeneration of the cartilage endplates reduces the action of the translucent membrane for fluid exchange between the intervertebral discs, accelerating degeneration of the lumbar intervertebral discs. Lumbar disc degeneration may cause symptoms such as lumbar disc herniation, lumbar spinal stenosis and lumbar spondylolisthesis, and when the symptoms are serious, surgical treatment is often required. The key step of intervertebral fusion is to scrape the cartilage of the degenerated end plate completely.

The curet that uses at present clinically is mostly including the handle, connecting rod and the curet that connect in order, when using, because the tissue that needs to scrape off probably distributes in optional position, in order to clear away tissues such as fibrous ring, nucleus pulposus completely, the doctor will correspond the position and the adjustment that the position was operated on to position and stand constantly according to the patient, and the operation time is longer, and doctor's operation intensity is great, and physical demands is great, and the operation process is extremely difficult.

Disclosure of Invention

In view of the above-mentioned drawbacks, the technical problem to be solved by the present invention is to provide an adjustable coating-limiting spatula, so as to solve the problems that the structure is inflexible, a doctor needs to adjust the operation posture and the standing position continuously according to the corresponding position and the operation body position of a patient during use, the operation time is long, the operation intensity of the doctor is high, the physical consumption is high, and the operation process is extremely difficult in the prior art.

The invention provides an adjustable limited-coating spatula, which comprises:

a scraping member comprising a scraping spoon portion for scraping tissue;

the supporting piece is rotationally connected with the scraping piece;

the adjusting assembly is connected with the scraping piece and the supporting piece simultaneously and used for adjusting an included angle between the scraping piece and the supporting piece, the adjusting assembly comprises an adjusting knob, and the included angle between the scraping piece and the supporting piece is controlled by controlling the rotating angle of the adjusting knob;

and the handle is connected with one end of the supporting piece, which is far away from the scraping piece.

Preferably, the scraper member further comprises:

the probing part is integrally formed with the spatula part, and depth scales for observing probing depth are arranged on the probing part;

the rotating shaft is arranged at one end, far away from the spoon scraping part, of the probing part and is rotatably connected with the supporting piece.

Preferably, the adjustment assembly further comprises:

the driving worm wheel is connected with the adjusting knob, and the adjusting knob drives the driving worm wheel to rotate;

the transmission rod is connected with the supporting piece in a sliding mode, a first worm rod part and a second worm rod part are arranged at two ends of the transmission rod respectively, and the first worm rod part is meshed with the driving worm wheel;

the driven worm wheel is meshed with the second worm part and is rotationally connected with the supporting piece;

and the transmission assembly is simultaneously connected with the driven worm wheel, the supporting piece and the scraping piece and is used for transmitting the kinetic energy output by the driven worm wheel to the scraping piece.

Preferably, the supporting member is provided with an accommodating cavity, and the adjusting knob is rotatably connected with the supporting member and penetrates through the supporting member to extend into the accommodating cavity; the driving worm wheel, the driven worm wheel, the transmission rod and the transmission assembly are all arranged in the accommodating cavity.

Preferably, the transmission assembly comprises:

the first transmission gear is meshed with the driven worm gear and is rotationally connected with the supporting piece;

and the second transmission gear is meshed with the first transmission gear, and is fixedly connected with the scraping piece and used for driving the scraping piece to rotate.

Preferably, the spoon scraping part is a spoon-shaped structure, one end of the spoon-shaped structure, which is far away from the probing part, is large in diameter, and the other end of the spoon-shaped structure is small in diameter; the edge of the scraping spoon part is provided with a plurality of wide teeth for scraping tissues.

Preferably, a frosted layer is arranged on the supporting piece; the handle is provided with anti-skid grains or anti-skid convex points; the handle is made of wood.

Preferably, a sliding groove matched with the transmission rod is arranged on the side wall of the accommodating cavity; the containing cavity is also internally provided with a limiting ring for limiting the movement direction of the transmission rod, and the transmission rod penetrates through the limiting ring and moves along the direction of the sliding groove.

Preferably, the adjusting knob is provided with angle scales for controlling the adjusting angle; the adjusting knob is also provided with an installation clamping groove used for clamping with the supporting piece; a mounting hole for mounting the adjusting knob is formed in the position, close to the handle, of the support piece; the supporting piece is also provided with a plurality of mounting shafts which are used for being rotationally connected with the transmission assembly.

Preferably, the supporting member is provided with a through groove for accommodating the scraping member, the through groove is provided with an elastic shielding member, and the elastic shielding member is connected with the scraping member and the supporting member simultaneously and used for shielding the adjusting assembly and the through groove.

According to the scheme, the adjustable limited-coating spatula provided by the invention can accurately control the included angle between the scraping part and the supporting part through the arrangement of the adjusting knob, so that the adjustable limited-coating spatula is better adapted to the characteristics of a disc structure, when a doctor uses the adjustable limited-coating spatula, the adjustable limited-coating spatula can be adapted to the corresponding part or the operation body position of a patient only by rotating the adjusting knob, the operation posture and the standing position do not need to be changed, and the structure is more flexible; through the setting of probing the scale, can audio-visually observe the probing depth, guarantee that the tissue curettage more thoroughly in the operation, and can not influence the tissue of other positions. The invention solves the problems that the structure is not flexible, a doctor needs to continuously adjust the operation posture and the standing position according to the corresponding part and the operation body position of a patient when in use, the operation time is longer, the operation intensity of the doctor is higher, the physical consumption is higher, and the operation process is extremely difficult in the prior art, has obvious effect and is suitable for wide popularization.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of an adjustable limited-coating spatula provided in the invention;

FIG. 2 is a schematic structural view of an adjustable limited-coating spatula in a front view;

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic structural view of another adjustable limited-coating spatula provided in the invention;

FIG. 5 is a schematic structural view of another adjustable limited-application spatula in front view according to the present invention;

fig. 6 is a sectional view of the structure taken along the line B-B in fig. 5.

In FIGS. 1-6:

1. a scraping member; 2. a support member; 3. an adjustment assembly; 4. a handle; 5. a suction assembly; 11. a spoon scraping part; 12. a probing part; 13. a rotating shaft; 14. wide teeth; 21. an accommodating chamber; 22. a chute; 23. a limiting ring; 24. installing a shaft; 25. a through groove; 31. adjusting a knob; 32. a drive worm gear; 33. a transmission rod; 34. a driven worm gear; 35. a transmission assembly; 121. depth graduation; 311. angle scales; 312. installing a clamping groove; 331. a first worm part; 332. a second worm part; 351. a first drive gear; 352. a second transmission gear.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 3, an embodiment of an adjustable spatula according to the present invention will now be described. The adjustable limited-coating spatula comprises a scraping piece 1, a supporting piece 2, an adjusting component 3 and a handle 4, wherein the scraping piece 1 comprises a spatula part 11 for scraping tissues; the supporting piece 2 is rotationally connected with the scraping piece 1; the adjusting assembly 3 is connected with the scraping part 1 and the supporting part 2 at the same time and is used for adjusting an included angle between the scraping part 1 and the supporting part 2, the adjusting assembly 3 comprises an adjusting knob 31, and the included angle between the scraping part 1 and the supporting part 2 is controlled by controlling the rotating angle of the adjusting knob 31; a handle 4 is connected to the end of support 2 remote from scraper 1.

For convenience of explanation, please refer to fig. 1, a rectangular coordinate system is established with any point in space as an origin, the axial direction of the support 2 as a Z-axis, the setting direction of the adjusting knob 31 as an X-axis, and a linear direction perpendicular to both the X-axis and the Z-axis as a Y-axis, wherein an XY plane is a horizontal plane, a direction indicated on the horizontal plane is a horizontal direction, and a direction indicated on the Z-axis is a vertical direction.

Compared with the prior art, this kind of adjustable limit is scribbled spatula and is scraped the contained angle between 1 and the support piece 2 through the control that setting up of adjust knob 31 can be accurate to the characteristic of better adaptation intervertebral disc structure, when the doctor uses, only need rotatory adjust knob 31 can adapt to the patient and correspond position or operation position, need not to change operation posture and station, this structure is more nimble, reduce doctor's physical demands, easy operation, the effect is showing, is suitable for extensive popularization.

As another embodiment of the present invention, the structure of the adjustable limited-coating spatula is substantially the same as that in the above embodiment, except that the scraping element 1 further includes a probing portion 12 and a rotating shaft 13, wherein the probing portion 12 and the spatula portion 11 are integrally formed, and the probing portion 12 is provided with a depth scale 121 for observing the probing depth; the rotating shaft 13 is disposed at one end of the probing portion 12 away from the spatula portion 11 and is rotatably connected to the supporting member 2. The depth scale 121 also marks the depth-limiting position in a highlighted manner, so as to avoid the injury of the healthy tissue part of the patient caused by the excessive insertion amount.

In the present embodiment, the spatula portion 11 is a spoon-shaped structure with a larger diameter at one end far away from the probing portion 12 and a smaller diameter at the other end; be equipped with a plurality of wide teeth 14 that are used for striking off the tissue on the edge of scraping spoon portion 11, it has appropriate radian to scrape spoon portion 11, can ensure that the tissue at intervertebral disc both ends is observed more clearly, scrape the characteristic that the setting of spoon portion 11 and wide tooth 14 can be fine adaptation intervertebral disc structure, the surface and the fibrous ring of piece 1 are scraped in the increase, the frictional force of cartilage endplate, the rapid elimination fibrous ring, tissues such as nucleus pulposus, wide tooth is the diagonal, similar planer tool is the same, except that the frictional force of increase and contact surface, can also be more relaxed with the fibrous ring, the nucleus pulposus, the clearance of cartilage face, improve cleaning effect and cleaning efficiency.

In this embodiment, a cold light lamp holder is disposed above the spatula portion 11, and the cold light lamp holder can increase the operation field of vision and more clearly see the intervertebral space and facial condition. The outer surface of the supporting piece 2 is provided with a frosted layer, the frosted surface can reduce light reflection, the friction force between fingers and a handle can be increased, the slipping caused by bloodstains or grease on the hand is reduced, the deeper insertion disc of the digging spoon is reduced, the good operation visual field of a doctor is ensured, and meanwhile, the safety in the operation process is ensured; be equipped with anti-skidding line or anti-skidding bump on the handle 4, the material of handle 4 is timber, and this kind of setting effectively increases handle 4's the power of controlling, and stability is better in the use.

Referring to fig. 1 to 6 together, as another embodiment of the present invention, the structure of the adjustable type limited-coating spatula is basically the same as that of the above embodiment, except that the adjusting assembly 3 further includes a driving worm wheel 32, a transmission rod 33, a driven worm wheel 34, and a transmission assembly 35, wherein the driving worm wheel 32 is fixedly connected with the adjusting knob 31, and the adjusting knob 31 drives the driving worm wheel 32 to rotate; the transmission rod 33 is slidably connected with the support 2, a first worm part 331 and a second worm part 332 are respectively arranged at two ends of the transmission rod 33, and the first worm part 331 is meshed with the driving worm wheel 32; the driven worm wheel 34 is meshed with the second worm part 332 and is rotatably connected with the support 2; the transmission assembly 35 is connected with the driven worm wheel 34, the support member 2 and the scraper 1 at the same time, for transmitting the kinetic energy output from the driven worm wheel 34 to the scraper 1. The middle of the transmission rod 33 is of a cylindrical structure, the diameter of the cylindrical structure is respectively larger than the maximum outer diameter of the first worm part 331 and the maximum outer diameter of the second worm part 332, and the arrangement mode can avoid the first worm part 331 and the second worm part 332 from contacting with the supporting part 2 to influence the transmission effect.

Adjusting knob 31 rotates, drives initiative worm wheel 32 and rotates, and elevating movement when drive transfer line 33 pivoted, drive transfer line 33 drive driven worm wheel 34 and rotate, and driven worm wheel 34 passes through drive assembly 35 with kinetic energy transmission to scraping a 1, realizes scraping the rotation of a 1. The structure has better regulation precision on the angle of the scraping piece 1 and better control effect.

In this embodiment, the supporting member 2 is provided with an accommodating cavity 21, and the adjusting knob 31 is rotatably connected with the supporting member 2 and extends into the accommodating cavity 21 through the supporting member 2; the driving worm wheel 32, the driven worm wheel 34, the transmission rod 33 and the transmission assembly 35 are all arranged in the accommodating cavity 21. The transmission precision of the transmission mode of the worm wheel and the worm is higher, and the control effect is better.

As another embodiment of the present invention, the structure of the adjustable limited-coating spatula is substantially the same as that of the previous embodiment, except that the transmission assembly 35 comprises a first transmission gear 351 and a second transmission gear 352, wherein the first transmission gear 351 is engaged with the driven worm wheel 34 and is rotatably connected with the support 2; the second transmission gear 352 is engaged with the first transmission gear 351, and the second transmission gear 352 is fixedly connected with the rotating shaft 13 and is used for driving the scraping element 1 to rotate. The first transmission gear 351 and the second transmission gear 352 may be spur gears, or may be helical gears or gear sets if the transmission direction changes. It is within the scope of the present disclosure to achieve the performance benefits associated with the transmission assembly 35 described above.

In the embodiment, a sliding groove 22 adapted to the transmission rod 33 is arranged on the side wall of the accommodating cavity 21; a limiting ring 23 for limiting the movement direction of the transmission rod 33 is further arranged in the accommodating cavity 21, and the transmission rod 33 penetrates through the limiting ring 23 and moves along the sliding groove 22. The limiting ring 23 is further provided with a bearing therein, and the bearing is slidably connected with the transmission rod 33 and used for reducing friction force in the rotation process of the transmission rod 33.

As another embodiment of the present invention, the structure of the adjustable limited-coating spatula is basically the same as that of the above embodiment, except that the adjusting knob 31 is provided with an angle scale 311 for controlling the adjusting angle; the adjusting knob 31 is further provided with an installation clamping groove 312 for clamping with the support member 2, and the installation clamping groove 312 ensures that the adjusting knob 31 is stably connected with the support member 2; a mounting hole for mounting the adjusting knob 31 is formed on the support 2 close to the handle 4; the support member 2 is further provided with a plurality of mounting shafts 24 for rotatably connecting with the transmission assembly 35. The angle scale 311 can mark the angle of the knob, can rotate by 90 degrees/45 degrees left and right, and can adjust the angle of the scoop to dig out nucleus pulposus and intervertebral disc as much as possible.

In the present embodiment, a through groove 25 for accommodating scraping element 1 is disposed on supporting element 2, and through groove 25 is disposed in a manner of fitting scraping element 1, so that interference between scraping element 1 and supporting element 2 during rotation is avoided; be equipped with elasticity shielding piece on logical groove 25, elasticity shielding piece is connected with scraping a 1 and support piece 2 simultaneously for shelter from adjusting part 3 and logical groove 25, elasticity shielding piece can be the rubber material, both guaranteed not to influence support piece 2 and strike off the change of angle between the piece 1, can effectively avoid holding chamber 21 and adjusting part 3 and expose again.

As another embodiment of the present invention, the structure of the adjustable limited-coating spatula is substantially the same as that in the above embodiment, but the difference is that the probing portion 12 is a tubular structure communicated with the spatula portion 11, one end of the probing portion 12 away from the spatula portion 11 is detachably connected with the suction assembly 5, the suction assembly 5 includes a connector connected with the probing portion 12, a connecting pipe connected with the connector, and a suction apparatus connected with the connecting pipe, and the suction apparatus is used for sucking out the tissue separated from the spatula portion 11, so as to ensure that the spatula portion 11 can operate continuously without being repeatedly taken out and extended. When in use, if a small amount of tissues exist, the scraping spoon part 11 is used for digging and taking to realize the separation of the tissues; if a large amount of tissues exist, the suction assembly 5 is connected with the probing part 12, after the spatula part 11 digs the tissues, the suction assembly 5 takes the tissues out in time, and the spatula part 11 can work continuously for a long time.

In this embodiment, scraping element 1 is detachably connected to support element 2, facilitating the replacement of spoons of different sizes. The scraping spoon part 11 is rotatably connected with the probing part 12, the relative position relation between the opening of the scraping spoon part 11 and the probing part 12 can be adjusted in a portable mode, the structure is more flexible, and the application range is wider. Illustratively, a plurality of ratchets are circumferentially arranged at one end of the spatula part 11 connected with the probing part 12, a sliding groove for accommodating the spatula part 11 is arranged at one end of the probing part 12 connected with the spatula part 11, and a plurality of elastic protrusions clamped with the ratchets are circumferentially arranged in the sliding groove. When no force is applied, the ratchet is clamped with the elastic bulge, and the spoon scraping part 11 and the probing part 12 do not move relatively; in the process of rotating the scraper part 11, the ratchet is driven by large acting force to bend the elastic bulge so as to move to the next position beyond the elastic bulge.

In this embodiment, the surface of the scraping element 1 is further provided with a luminescent layer, so that the probing portion 12 can illuminate to see the depth scale 121 more clearly during use, thereby avoiding the problem of difficulty in observation caused by a shadow surface generated by angle change during an operation; the luminescent layer on the outer surface of the scraping spoon part 11 can illuminate the position to be cut off, the visual field is better, and a luminescent lamp holder for illumination can be embedded in the front end of the scraping spoon part 11. It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is indicated based on the orientation or positional relationship as shown in the figures, which is for convenience in describing the invention and to simplify the description, and that does not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner and is not to be construed as limiting the invention.

The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An adjustable limited coating spatula, comprising:

a scraping element (1) comprising a spatula section (11) for scraping tissue;

a support (2) which is rotationally connected to the scraper (1);

the adjusting assembly (3) is connected with the scraping piece (1) and the supporting piece (2) simultaneously and used for adjusting an included angle between the scraping piece (1) and the supporting piece (2), the adjusting assembly (3) comprises an adjusting knob (31), and the included angle between the scraping piece (1) and the supporting piece (2) is controlled by controlling the rotating angle of the adjusting knob (31);

a handle (4) connected with one end of the supporting piece (2) far away from the scraping piece (1).

2. The adjustable limited coating spatula according to claim 1, wherein the scraper (1) further comprises:

a probing part (12) integrally formed with the scraping spoon part (11), wherein the probing part (12) is provided with a depth scale (121) for observing probing depth;

the rotating shaft (13) is arranged at one end, far away from the scraping spoon part (11), of the probing part (12) and is rotatably connected with the supporting part (2).

3. The adjustable limited coating spatula of claim 1, wherein the adjustment assembly (3) further comprises:

the driving worm wheel (32) is connected with the adjusting knob (31), and the adjusting knob (31) drives the driving worm wheel (32) to rotate;

the transmission rod (33) is connected with the support piece (2) in a sliding mode, a first worm part (331) and a second worm part (332) are arranged at two ends of the transmission rod (33) respectively, and the first worm part (331) is meshed with the driving worm wheel (32);

a driven worm gear (34) engaged with the second worm part (332) and rotatably connected to the support member (2);

and the transmission assembly (35) is simultaneously connected with the driven worm wheel (34), the supporting piece (2) and the scraping piece (1) and is used for transmitting the kinetic energy output by the driven worm wheel (34) to the scraping piece (1).

4. The adjustable limited-coating spatula according to claim 3, wherein a containing cavity (21) is formed in the supporting member (2), and the adjusting knob (31) is rotatably connected with the supporting member (2) and extends into the containing cavity (21) through the supporting member (2); the driving worm wheel (32), the driven worm wheel (34), the transmission rod (33) and the transmission assembly (35) are all arranged in the accommodating cavity (21).

5. The adjustable limited coating spatula of claim 3, wherein the transmission assembly (35) comprises:

a first transmission gear (351) engaged with the driven worm wheel (34) and rotatably connected with the support member (2);

and the second transmission gear (352) is meshed with the first transmission gear (351), and the second transmission gear (352) is fixedly connected with the scraping piece (1) and is used for driving the scraping piece (1) to rotate.

6. The adjustable limited-application spatula according to claim 2, wherein the spatula portion (11) is a spoon-like structure with a large diameter at one end far away from the probing portion (12) and a small diameter at the other end; the edge of the scraping spoon part (11) is provided with a plurality of wide teeth (14) for scraping tissues.

7. The adjustable limited-coating spatula according to claim 1, wherein the support (2) is provided with a frosted layer; the handle (4) is provided with anti-skid grains or anti-skid salient points; the handle (4) is made of wood.

8. The adjustable limited-coating spatula according to claim 4, wherein a sliding groove (22) matched with the transmission rod (33) is formed in the side wall of the accommodating cavity (21); the containing cavity (21) is internally provided with a limiting ring (23) used for limiting the movement direction of the transmission rod (33), and the transmission rod (33) penetrates through the limiting ring (23) and moves along the direction of the sliding groove (22).

9. The adjustable limited-coating spatula according to claim 3, wherein the adjusting knob (31) is provided with an angle scale (311) for controlling an adjusting angle; the adjusting knob (31) is also provided with an installation clamping groove (312) used for clamping with the supporting piece (2); a mounting hole for mounting the adjusting knob (31) is formed in the position, close to the handle (4), on the supporting piece (2); the supporting piece (2) is also provided with a plurality of mounting shafts (24) which are used for being rotationally connected with the transmission assembly (35).

10. An adjustable limited-application spatula according to any one of claims 1 to 9, wherein a through slot (25) is provided in the support member (2) for receiving the scraping element (1), and an elastic shielding element is provided in the through slot (25) and is connected to both the scraping element (1) and the support member (2) for shielding the adjustment assembly (3) and the through slot (25).