Resin quantitative filling device of hemoperfusion device

Abstract

The utility model relates to the technical field of medical instruments, in particular to a hemoperfusion device resin quantitative filling device which comprises a base, the higher top of the base is fixedly connected with a quantitative feeding box, the bottom end of the quantitative feeding box is provided with a pre-storage cavity, the outer wall of one side of the base is fixedly connected with two supporting plates, and the supporting plates are fixedly connected with the base. One end of each supporting plate is fixedly connected with a [-shaped frame, and a vibration assembly is arranged in each [-shaped frame. Through the arranged vibration assembly, the stably-installed hemoperfusion device can be impacted at high frequency, the upper half part and the lower half part of the outer wall of the hemoperfusion device can be knocked, so that the position of filled resin is changed, uniform distribution of the resin is promoted, formation of gaps is reduced, the adsorption effect is improved, quantitative and enough resin particles can fall down every time a partition plate is pulled away, and the adsorption effect is improved. And then the resin falls into the hemoperfusion device, quantitative filling of the resin is completed, that is, formation of gaps can be reduced while quantitative filling is completed, two purposes are achieved at a time, and efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a quantitative resin filling device for a blood perfusion device. Background Technology

[0002] A hemoperfusion device is a medical device primarily used for blood purification therapy. It removes toxic substances from the blood through extracorporeal circulation and adsorption, serving as a method of blood purification. It is mainly used for the adsorption of molecular toxins in acute and chronic drug poisoning, uremia, and for the adsorption of pathogenic factors in liver disease and the immune system. When a hemoperfusion device requires the use of resin as an adsorbent, it employs a resin metering filling device.

[0003] The resin metering device is primarily used during the production of resin hemoperfusion devices to precisely control and fill the resin adsorbent into the device's canister. In actual use, once the hemoperfusion device has been manufactured and applied in clinical treatment, the resin metering device is typically not reused. This is because hemoperfusion devices are single-use medical devices; once used, they are disposed of according to medical waste procedures and are not refilled with resin or reused.

[0004] However, in existing technologies, resin is typically filled into the hemoperfusion device manually. Manual filling can lead to insufficient or excessive adsorbent inside the device, making precise filling difficult. Furthermore, manual filling requires the use of stirring rods or other tools to agitate the resin and reduce voids, thus affecting adsorption efficiency. Overall, the efficiency of manual filling needs improvement. Therefore, we propose a quantitative resin filling device for hemoperfusion devices. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a quantitative resin filling device for a blood perfusion device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a quantitative resin filling device for a blood perfusion apparatus, comprising a base, a quantitative feeding box fixedly connected to the higher top of the base, a pre-storage cavity provided at the bottom end of the quantitative feeding box, two support plates fixedly connected to one outer wall of the base, and a U-shaped frame fixedly connected to one end of each support plate, a vibration assembly provided inside the U-shaped frame, the vibration assembly including a connecting gear, an inner concave block slidably connected to the inner wall of the pre-storage cavity, two mutually spaced and symmetrically positioned rack blocks fixedly connected to the outer wall of the inner concave block, the connecting gear and the rack blocks being meshed, and a rotatable connection between the two inner walls of the U-shaped frame. The device comprises three horizontal shafts, a central shaft, a connecting shaft, and a central shaft. Impact components are installed on the outer walls of both central shafts. Connecting gears, large gears, and small gears are fixedly connected to the outer walls of horizontal shafts one, two, and three, respectively. The small gears mesh with the large gears. A connecting belt one is connected between the outer walls of horizontal shafts one and two. A connecting belt two is connected between horizontal shaft three and the outer wall of central shaft one. A connecting belt three is connected between horizontal shaft three and the outer wall of connecting shaft one. A connecting belt four is connected between connecting shaft two and the outer wall of central shaft two. An electric telescopic rod is installed at the top of the pre-storage cavity, and one end of the electric telescopic rod is fixedly connected to the outer wall of the quantitative feeding box.

[0007] Preferably, the quantitative feeding box has multiple partitions arranged at equal intervals inside, which penetrate and snap into the interior. The partitions divide the internal space of the quantitative feeding box into multiple cavities of equal volume. Each cavity is filled with an equal amount of resin, and the amount of resin in each cavity is equal to the amount of resin required to fill the blood perfusion device. The top of the pre-storage cavity is provided with an inlet groove. A trapezoidal block is fixedly connected between the pre-storage cavity and the quantitative feeding box. The trapezoidal block, the pre-storage cavity, and the quantitative feeding box are interconnected internally.

[0008] Preferably, the connecting gear, the large gear, and the small gear are respectively located in the middle of the first horizontal shaft, the second horizontal shaft, and the third horizontal shaft.

[0009] Preferably, the impact assembly includes two sets of striking components. The two sets of striking components are rotationally symmetrical about the central axis. Each set of striking components includes multiple hammer bodies. One end of each hammer body is a rubber ball. Within the same set of striking components, the hammer body in the middle position has the shortest length. The height of each hammer body on both sides gradually increases. The distance between any two adjacent hammer bodies is equal. The connecting band is located between two adjacent hammer bodies.

[0010] Preferably, one end of the output shaft of the electric telescopic rod passes through the interior of the quantitative feeding box. A connecting block is sleeved on and rotatably connected to the outer wall of the output shaft of the electric telescopic rod. An annular shell is rotatably connected to the top of the concave block. The outer wall of the annular shell is slidably connected to one side of the two rack blocks. An opening matching the blood perfusion device is opened at the bottom of the concave block. Multiple equidistantly arranged stirring racks and support racks are fixedly connected to the connecting block and the outer wall of the output shaft of the electric telescopic rod, respectively. One end of each stirring rack is fixedly connected to the inner wall of the annular shell, and one end of each support rack is fixedly connected to the inner wall of the concave block.

[0011] Preferably, the outer wall of the pre-storage cavity has two vertical grooves that are far apart from each other and symmetrically distributed. The inner wall of the vertical groove has two through grooves, through which the interior of the vertical groove can be connected to the outside and the interior of the pre-storage cavity. The height of the through groove is equal to that of the rack block. A vertical plate is fixedly connected between the two ends of the inner wall of the vertical groove. The rack block slides and is sleeved on the outer wall of the vertical plate. The width of the vertical plate is slightly smaller than the width of the rack block. The width of the gap between the vertical plate and the vertical groove is smaller than the diameter of the resin.

[0012] Preferably, two symmetrical and far apart protrusions are fixedly connected to the outer wall of the annular shell, and two far apart and rotationally symmetrical arc-shaped grooves are formed on the inner wall of the pre-storage cavity, with the protrusions slidably connected inside the arc-shaped grooves.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] During the process of delivering resin into the hemoperfusion device, the annular shell uses a vibration component to impact the stably installed hemoperfusion device at high frequency, striking the upper and lower halves of its outer wall. This changes the position of the resin filling, promoting its uniform distribution and reducing the formation of voids. This replaces manual labor and improves the adsorption effect. Each time the partition is removed, a fixed amount of resin particles fall and then into the hemoperfusion device, completing the quantitative filling of resin. This achieves both quantitative filling and reduced void formation, achieving two goals at once and improving efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a half-section schematic diagram of the overall structure of the pre-stored cavity and the C-shaped frame of this utility model;

[0017] Figure 3 This utility model Figure 2 Enlarged schematic diagram of the overall structure at point A;

[0018] Figure 4 This utility model Figure 2 Enlarged schematic diagram of section B of the overall structure;

[0019] Figure 5 This utility model Figure 2 Enlarged view of the overall structure at point C;

[0020] Figure 6 This is a schematic cross-sectional view of the overall structure of this utility model.

[0021] In the diagram: 1. Base; 2. Quantitative feed box; 3. Electric telescopic rod; 4. Pre-storage cavity; 5. Concave block; 6. Mixing rack; 7. Connecting block; 8. Annular shell; 9. Protrusion; 10. Arc groove; 11. Vertical groove; 12. Vertical plate; 13. Rack block; 14. C-shaped frame; 15. Horizontal shaft one; 16. Connecting gear; 17. Connecting belt one; 18. Horizontal shaft two; 19. Large gear; 20. Small gear; 21. Horizontal shaft three; 22. Connecting belt two; 23. Connecting belt three; 24. Central shaft one; 25. Impact assembly; 26. Connecting shaft; 27. Connecting belt four; 28. Central shaft two. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Example 1

[0023] Please see Figures 1 to 6This utility model provides a technical solution: a quantitative resin filling device for a blood perfusion apparatus, comprising a base 1, a quantitative feeding box 2 fixedly connected to the higher top of the base 1, a pre-storage cavity 4 provided at the bottom of the quantitative feeding box 2, two support plates fixedly connected to one side of the outer wall of the base 1, and a U-shaped frame 14 fixedly connected to one end of each support plate, a vibration component provided inside the U-shaped frame 14, the vibration component including a connecting gear 16, an inner concave block 5 slidably connected to the inner wall of the pre-storage cavity 4, two mutually spaced and symmetrically positioned rack blocks 13 fixedly connected to the outer wall of the inner concave block 5, the connecting gear 16 and the rack blocks 13 being meshed with each other, and a horizontal shaft 15, a horizontal shaft 18, a horizontal shaft 3 21, and a central shaft 2 rotatably connected between the two inner walls of the U-shaped frame 14. 4. The connecting shaft 26 and the central shaft 28, the outer walls of the central shaft 1 24 and the central shaft 2 28 are all equipped with impact components 25. The outer walls of the horizontal shaft 1 15, the horizontal shaft 2 18 and the horizontal shaft 3 21 are respectively fixedly connected with connecting gear 16, large gear 19 and small gear 20. The small gear 20 and the large gear 19 mesh with each other. The outer walls of the horizontal shaft 1 15 and the horizontal shaft 2 18 are connected by a connecting belt 17. The outer walls of the horizontal shaft 3 21 and the central shaft 1 24 are connected by a connecting belt 22. The outer walls of the horizontal shaft 3 21 and the connecting shaft 26 are connected by a connecting belt 3 23. The outer walls of the connecting shaft 26 and the central shaft 2 28 are connected by a connecting belt 4 27. The top of the pre-storage cavity 4 is equipped with an electric telescopic rod 3. One end of the electric telescopic rod 3 is fixedly connected to the outer wall of the quantitative feeding box 2. During the process of delivering resin into the hemoperfusion device, the annular shell 8 uses a vibration component to impact the stably installed hemoperfusion device at high frequency, striking the upper and lower halves of its outer wall. This changes the position of the resin filling, promoting its uniform distribution and reducing the formation of voids, thus improving the adsorption effect. Each time the partition is removed, a fixed amount of resin particles fall and subsequently enter the hemoperfusion device, completing the quantitative filling of resin. This achieves both quantitative filling and reduced void formation, resulting in a double benefit and improved efficiency. Example 2

[0024] Please see Figures 1 to 6 Based on Embodiment 1, the inside of the quantitative feeding box 2 is permeated and snapped with multiple partitions arranged at equal intervals. The partitions divide the internal space of the quantitative feeding box 2 into multiple cavities of equal volume. Each cavity is filled with an equal amount of resin, and the amount of resin in each cavity is equal to the amount of resin required to fill the blood perfusion device. The top of the pre-storage cavity 4 is provided with an inlet groove. A trapezoidal block is fixedly connected between the pre-storage cavity 4 and the quantitative feeding box 2. The interiors of the trapezoidal block, the pre-storage cavity 4, and the quantitative feeding box 2 are interconnected.

[0025] It should be noted that: the base 1 has a mounting bracket on its lower top that can be used to attach the blood perfusion device. The shape of the groove inside the mounting bracket is adapted to the blood perfusion device. The partition is engaged by a slot inside the metering box 2, and the partition can be horizontally removed from the metering box 2. When the partition at the bottom is removed, resin particles equal to the amount of resin required by the blood perfusion device will detach from the metering box 2, pass through the trapezoidal block and the feed trough into the pre-storage cavity 4, and then collect in the inner cavity of the annular shell 8 and the concave block 5. Example 3

[0026] Please see Figures 1 to 6 Based on Embodiment 2, the connecting gear 16, large gear 19, and small gear 20 are respectively located in the middle of horizontal shaft 15, horizontal shaft 28, and horizontal shaft 3 21. The impact assembly 25 includes two sets of striking components, which are rotationally symmetrical about the axis of the central shaft 24. Each set of striking components includes multiple hammers, one end of which is a rubber ball. Within the same set of striking components, the hammer in the middle position has the shortest length, and the height of the hammers on both sides gradually increases. Every two adjacent hammers... The spacing between them is equal. The position of the connecting band 27 is located between two adjacent hammer bodies. One end of the output shaft of the electric telescopic rod 3 passes through the interior of the quantitative feeding box 2. A connecting block 7 is sleeved on the outer wall of the output shaft of the electric telescopic rod 3 and rotatably connected. An annular shell 8 is rotatably connected to the top of the concave block 5. The outer wall of the annular shell 8 is slidably connected to one side of the two toothed blocks 13. The bottom end of the concave block 5 has an opening that matches the blood perfusion device. The connecting block 7 and the outer wall of the output shaft of the electric telescopic rod 3 are respectively A plurality of equidistantly arranged stirring racks 6 and support frames are fixedly connected. One end of each stirring rack 6 is fixedly connected to the inner wall of the annular shell 8, and one end of each support frame is fixedly connected to the inner wall of the concave block 5. Two vertical grooves 11 are opened on the outer wall of the pre-storage cavity 4, which are far apart from each other and symmetrically distributed. Two through grooves are opened on the inner wall of the vertical grooves 11, through which the interior of the vertical grooves 11 can be connected to the outside and the interior of the pre-storage cavity 4. The height of the through grooves is equal to that of the rack block 13. A vertical plate 12 is fixedly connected between the two ends of the inner wall of 11. A rack block 13 slides and is fitted on the outer wall of the vertical plate 12. The width of the vertical plate 12 is slightly smaller than the width of the rack block 13. The width of the gap between the vertical plate 12 and the vertical groove 11 is smaller than the diameter of the resin particles. Two symmetrical and far apart protrusions 9 are fixedly connected to the outer wall of the annular shell 8. Two far apart and rotationally symmetrical arc grooves 10 are opened on the inner wall of the pre-storage cavity 4. The protrusions 9 are slidably connected inside the arc grooves 10.

[0027] During the process of resin particles gathering into the cavity of the annular shell 8 and the concave block 5, some resin particles will directly pass through the opening at the bottom of the concave block 5 and finally enter the interior of the hemoperfusion device. As the number of resin particles suddenly increases, resin particles will accumulate in the cavity of the annular shell 8 and the concave block 5. However, the activation of the electric telescopic rod 3 causes its output shaft to extend. Through the arc-shaped groove 10 and the protrusion 9, since the protrusion 9 is fixedly connected to the outer wall of the annular shell 8 and slidably connected to the inside of the arc-shaped groove 10, and the annular shell 8 is rotatably connected to the top of the concave block 5, the annular shell 8 will rotate along the inner wall of the pre-stored cavity 4 and the top of the concave block 5 as the output shaft of the electric telescopic rod 3 extends. During this period, each stirring rack 6 rotates and moves downward, stirring the accumulated resin particles to a certain extent, so that the resin particles can continuously flow out of the cavity of the annular shell 8 and the concave block 5. During the downward movement of the concave block 5, the connecting gear 16 meshing with it will continuously rotate, thereby driving the horizontal shaft one 15 operates in conjunction with the two connecting belts 17. Similarly, the horizontal shaft 18 rotates together with the large gear 19 and drives the small gear 20 to rotate. It should be noted that the number of gears in the large gear 19 is greater than that in the small gear 20. Therefore, when the large gear 19 rotates once, the small gear 20 will rotate several times. Under the connection of the horizontal shaft 21, connecting belt 22, central shaft 1 24, connecting belt 23, connecting shaft 26, and central shaft 2 28, each hammer body starts to rotate around the axis of central shaft 1 24 and central shaft 2 28. Through the hammer parts set at different heights, they will touch the upper and lower half of the blood perfusion device when they rotate. The blood perfusion device will also vibrate at a high frequency, but it will never disengage from the groove of the card holder. The position of the resin filled inside the blood perfusion device will change, promoting its uniform distribution and reducing the formation of gaps, which is conducive to improving the adsorption effect. The setting of the vertical plate 12 provides a basis for the normal and stable displacement of the rack block 13.

[0028] The working principle and usage process of this utility model are as follows: When the partition is removed, resin particles equal to the amount required by the hemoperfusion device will detach from the metering box 2, pass through the trapezoidal block and the feed trough, and enter the pre-storage cavity 4. They then collect in the inner cavity of the annular shell 8 and the concave block 5. During this process, some resin particles will directly pass through the opening at the bottom of the concave block 5 and finally enter the interior of the hemoperfusion device. As the number of resin particles suddenly increases, resin particles will accumulate in the inner cavity of the annular shell 8 and the concave block 5. However, when the electric telescopic rod 3 is activated, its output shaft extends. Through the arc-shaped groove 10 and the protrusion 9, which is fixedly connected to the outer wall of the annular shell 8 and slidably connected inside the arc-shaped groove 10, and with the annular shell 8 rotatably connected to the top of the concave block 5, the annular shell 8 will rotate along the inner wall of the pre-stored cavity 4 and the top of the concave block 5 as the output shaft of the electric telescopic rod 3 extends. During this time, each stirring rack 6 rotates and moves downward, agitating the accumulated resin particles to a certain extent, allowing the resin particles to flow continuously. As the inner cavity of the annular shell 8 and the concave block 5 moves downward, the connecting gear 16 meshing with it will continuously rotate, thereby driving the horizontal shaft 15 and the two connecting belts 17 to operate. Similarly, the horizontal shaft 28 and the large gear 19 rotate together, driving the small gear 20 to rotate. It should be noted that the number of gears in the large gear 19 is greater than that in the small gear 20. Therefore, for every one rotation of the large gear 19, the small gear 20 will rotate several times. (The remaining text appears to be a list of components: horizontal shaft 3 21, connecting belt 22, central shaft 1 24, connecting belt 3 23, and connecting shaft.) With the connection of 26 and the second central shaft 28, each hammer body starts to rotate around the axis of the first central shaft 24 and the second central shaft 28. Through the hammer parts set at different heights, they will touch the upper and lower half of the blood perfusion device when they rotate, and the blood perfusion device will also vibrate at a high frequency, but will never disengage from the groove of the card seat. The position of the resin filled inside the blood perfusion device will change, promoting its uniform distribution and reducing the formation of voids, which is conducive to improving the adsorption effect.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A resin metering device for a blood perfusion apparatus, comprising a base (1), characterized in that: A quantitative feeding box (2) is fixedly connected to the top of the base (1). A pre-storage cavity (4) is provided at the bottom of the quantitative feeding box (2). Two support plates are fixedly connected to one side of the outer wall of the base (1). A U-shaped frame (14) is fixedly connected to one end of each support plate. A vibration component is provided inside the U-shaped frame (14). The vibration component includes a connecting gear (16). An inner concave block (5) is slidably connected to the inner wall of the pre-storage cavity (4). Two rack blocks (13) that are far apart from each other and symmetrically positioned are fixedly connected to the outer wall of the inner concave block (5). The connecting gear (16) and the rack blocks (13) are meshed with each other. A horizontal shaft one (15), a horizontal shaft two (18), a horizontal shaft three (21), a central shaft one (24), a connecting shaft (26), and a central shaft two (28) are rotatably connected between the inner walls of the two sides of the U-shaped frame (14). Impact components (25) are provided on the outer walls of the first horizontal shaft (15), the second horizontal shaft (18) and the third horizontal shaft (21). Connecting gears (16), large gears (19) and small gears (20) are fixedly connected to the outer walls of the first horizontal shaft (15), the second horizontal shaft (18) and the third horizontal shaft (21), respectively. The small gears (20) and the large gears (19) mesh with each other. Connecting belt one (17) is connected between the outer walls of the first horizontal shaft (15) and the second horizontal shaft (18). Connecting belt two (22) is connected between the third horizontal shaft (21) and the outer wall of the first central shaft (24). Connecting belt three (23) is connected between the third horizontal shaft (21) and the outer wall of the connecting shaft (26). Connecting belt four (27) is connected between the connecting shaft (26) and the outer wall of the second central shaft (28). An electric telescopic rod (3) is provided on the top of the pre-storage cavity (4). One end of the electric telescopic rod (3) is fixedly connected to the outer wall of the quantitative feeding box (2).

2. The resin metering device for a blood perfusion apparatus according to claim 1, characterized in that: The quantitative feeding box (2) has multiple partitions that are arranged at equal intervals inside and are inserted into it. The partitions divide the internal space of the quantitative feeding box (2) into multiple cavities of equal volume. Each cavity is filled with an equal amount of resin, and the amount of resin inside each cavity is equal to the amount of resin required to fill the blood perfusion device. The top of the pre-storage cavity (4) is provided with a feeding groove. A trapezoidal block is fixedly connected between the pre-storage cavity (4) and the quantitative feeding box (2). The trapezoidal block, the pre-storage cavity (4) and the quantitative feeding box (2) are interconnected internally.

3. The resin metering device for a blood perfusion apparatus according to claim 1, characterized in that: The connecting gear (16), the large gear (19), and the small gear (20) are respectively located in the middle of the first horizontal shaft (15), the second horizontal shaft (18), and the third horizontal shaft (21).

4. The resin metering device for a blood perfusion apparatus according to claim 1, characterized in that: The impact assembly (25) includes two sets of striking assemblies. The two sets of striking assemblies are rotationally symmetrical about the axis of the central axis (24). Each set of striking assemblies includes multiple hammer bodies. One end of each hammer body is a rubber ball. Within the same set of striking assemblies, the hammer body in the middle position has the lowest length. The height of each hammer body on both sides gradually increases. The distance between each pair of adjacent hammer bodies is equal. The connecting band (27) is located between two adjacent hammer bodies.

5. The resin metering device for a blood perfusion apparatus according to claim 1, characterized in that: One end of the output shaft of the electric telescopic rod (3) passes through the interior of the quantitative feeding box (2). A connecting block (7) is sleeved on the outer wall of the output shaft of the electric telescopic rod (3) and rotatably connected. An annular shell (8) is rotatably connected to the top of the concave block (5). The outer wall of the annular shell (8) is slidably connected to one side of the two rack blocks (13). The bottom end of the concave block (5) has an opening that matches the blood perfusion device. Multiple equidistant stirring racks (6) and support frames are fixedly connected to the outer wall of the output shaft of the electric telescopic rod (3) and the connecting block (7). One end of each stirring rack (6) is fixedly connected to the inner wall of the annular shell (8), and one end of each support frame is fixedly connected to the inner wall of the concave block (5).

6. The resin metering device for a blood perfusion apparatus according to claim 1, characterized in that: The outer wall of the pre-storage cavity (4) has two vertical grooves (11) that are far apart from each other and symmetrically distributed. The inner wall of the vertical groove (11) has two through grooves. Through the through grooves, the interior of the vertical groove (11) can be connected to the outside and the interior of the pre-storage cavity (4). The height of the through groove is equal to that of the rack block (13). A vertical plate (12) is fixedly connected between the two ends of the inner wall of the vertical groove (11). The rack block (13) slides and is sleeved on the outer wall of the vertical plate (12). The width of the vertical plate (12) is slightly smaller than the width of the rack block (13). The width of the gap between the vertical plate (12) and the vertical groove (11) is smaller than the diameter of the resin particles.

7. The resin metering device for a blood perfusion apparatus according to claim 5, characterized in that: Two symmetrical and far apart protrusions (9) are fixedly connected to the outer wall of the annular shell (8). Two arc-shaped grooves (10) that are far apart and rotationally symmetrical are opened on the inner wall of the pre-storage cavity (4). The protrusions (9) are slidably connected inside the arc-shaped grooves (10).

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