JP6433065B2 - Interdental brush - Google Patents

Description

  The present invention relates to an interdental brush.

  Interdental brushes are widely used for interdental cleaning, which is difficult to clean with a toothbrush. As an interdental brush, what has a brush part provided with the flocked part by which the filament was clamped between the wires twisted helically and the handle part to which the said wire was attached are known, for example. However, pain may be felt when the wire hits the gums.

  On the other hand, as an interdental brush, a synthetic resin interdental brush not provided with a wire is also known (Patent Documents 1 to 3). The interdental brush made of synthetic resin is less likely to feel pain even when it hits the gingiva and the like, and has better contact feeling than an interdental brush having a wire. However, in the interdental brushes of Patent Documents 1 to 3, it is difficult to efficiently and sufficiently remove plaque and the like existing between the teeth.

Therefore, as an interdental brush made of synthetic resin, a shaft material that extends from the tip of the gripping portion (handle portion) and is coated with a soft resin (elastomer) on the surface is radially soft when viewed from the extending direction of the shaft material. An interdental brush provided with a plurality of resin protrusions has been proposed (Patent Document 4). In the interdental brush, the shaft material and the protrusions that can touch the gingiva are all made of a soft resin, so that the gingiva is hard to be damaged and the brushing force is higher than that without the protrusion.
However, in such an interdental brush, if the spacing between the protrusions is narrowed or the height of the protrusions is increased in order to sufficiently increase the brushing force between the teeth, the resistance force when inserting between the teeth is increased. Increases and insertability is impaired.

JP 11-192245 A JP 11-192246 A Japanese Patent Laid-Open No. 11-188050 JP2013-192866A

  SUMMARY OF THE INVENTION An object of the present invention is to provide an interdental brush that does not feel pain even when it hits a gingiva or the like, and has both a high brushing force and insertability between teeth.

  The interdental brush of the present invention is a synthetic resin interdental brush comprising a gripping portion and a brush portion provided at the tip of the gripping portion, and the brush portion is a shaft extending from the tip of the gripping portion. And a plurality of projecting pieces projecting from the shaft material, the projecting pieces project radially from the extending direction of the shaft material, and the brush portion is a region formed near the rear end. (A) and the area | region (B) formed in the front end side rather than the said area | region (A), The 1st protrusion pieces of arbitrary height are located in a line in the said area | region (A). In the region (B), only the protruding pieces having a height lower than that of the first protruding piece are arranged in the axial direction.

The region (A) preferably includes a region (A1) in which the first protruding pieces and second protruding pieces having a height lower than the first protruding pieces are alternately arranged in the axial direction.
The region (B) includes a front end side region (B1) and a rear end side region (B2) from the region (B1), and the region (B2) is equivalent to the second projecting piece. Only the fourth projecting pieces having the following height are arranged in the axial direction, and the projecting pieces of the region (B1) have a height equal to or less than the fourth projecting piece, and the region (B1) It is preferable to include a third protruding piece having a height lower than that of the fourth protruding piece.
In the region (A), it is preferable that an axial distance between the first projecting pieces increases toward the tip.
It is preferable that a diameter-enlarged portion that increases in diameter from the front end toward the rear end is provided near the brush portion of the grip portion.

  The interdental brush of the present invention is less susceptible to pain even when it hits the gingiva or the like, and has both a high brushing force and insertion between the teeth.

It is the top view which showed an example of the interdental brush of this invention. It is the top view to which the brush part of the interdental brush of FIG. 1 was expanded. It is II sectional drawing of the interdental brush of FIG. It is sectional drawing to which the front-end | tip part of the other example of the interdental brush of this invention was expanded.

The following definitions of terms apply throughout this specification and the claims.
The “soft resin” means a resin having a Shore A hardness of 90 or less as measured in accordance with JIS K 7215.
“Hard resin” means a resin having a higher hardness than a soft resin.

The interdental brush of this invention is a synthetic resin interdental brush provided with a holding part and the brush part provided in the front-end | tip of the said holding part. Hereinafter, an example of the interdental brush of the present invention will be shown and described in detail.
The interdental brush 1 of the present embodiment is made of synthetic resin, and includes a grip portion 2 and a brush portion 3 provided at the tip of the grip portion 2 as shown in FIG.

(Gripping part)
The grip part 2 is a columnar member for gripping with a finger.
In this example, the grip portion 2 has a flat plate shape.
In addition, the shape of the holding | gripping part 2 should just be a shape which can be hold | gripped with a finger | toe, A cylindrical shape (triangular prism shape, quadrangular prism shape etc.) etc. may be employ | adopted other than the said flat plate shape.

  The grip portion 2 of this example is provided with a diameter-enlarged portion 2 a that increases in diameter from the front end toward the rear end, closer to the brush portion 3. Thus, even when the interdental brush 1 is accidentally pressed strongly in the axial direction with the brush portion 3 inserted between the teeth, insertion between the teeth stops at the enlarged diameter portion 2a. Damage to the oral cavity is likely to be suppressed.

It does not specifically limit as a material which forms the holding part 2, The well-known material which forms the holding part of an interdental brush can be used, For example, the same material as the shaft 4 mentioned later is mentioned.
The material forming the grip portion 2 may be one type or two or more types.

(Brush part)
The brush portion 3 includes a shaft member 4 extending from the tip of the grip portion 2 and first to fourth projecting pieces 5 a to 5 d that project from the shaft member 4. The first protruding piece 5a to the fourth protruding piece 5d are formed integrally with a covering portion 4b of the shaft member 4 to be described later.

The shaft member 4 is a columnar member extending from the tip of the grip portion 2. The shaft member 4 may have a cylindrical shape as in this example, a triangular prism shape, a quadrangular prism shape, or the like. Further, the shaft member 4 in this example is reduced in diameter toward the tip. Thereby, it becomes easier to insert the brush part 3 between teeth.
As shown in FIG. 3, the shaft member 4 includes a core portion 4a extending from the tip of the grip portion 2, and a covering portion 4b that covers the surface of the core portion 4a.

  As a material for forming the shaft member 4, a hard resin is preferable, and a resin having a flexural modulus of 500 to 3000 MPa measured according to JIS K7203 is preferable. Specifically, for example, polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexylenedimethylene terephthalate (PCT), polyacetal (POM), polystyrene (PS), acrylonitrile butadiene styrene. Examples include resin (ABS), cellulose propionate (CP), polyarylate, polycarbonate, acrylonitrile / styrene copolymer resin (AS), and the like.

As a material for forming the covering portion 4b, a soft resin is preferable. By forming the covering portion 4b with a soft resin, the gums and the like are more unlikely to be damaged when the brush portion 3 is inserted between the teeth, and the contact feeling is improved.
Examples of the soft resin include elastomer resins such as polyolefin elastomers, styrene elastomers, and polyester elastomers.

  0.1-0.5 mm is preferable and, as for the thickness of the coating | coated part 4b, 0.1-0.3 mm is more preferable. If the thickness of the covering portion 4b is equal to or more than the lower limit value, it is easy to fill the soft resin up to the tip of the protruding piece. If the thickness of the covering portion 4b is equal to or less than the upper limit value, the insertion property between the teeth can be improved.

  As shown in FIG. 2, the brush portion 3 includes a region (A) 6 formed closer to the rear end and a region (B) 7 formed closer to the tip than the region (A) 6. The area (A) 6 includes a front end side area (A 1) 8 and a rear end side area (A 2) 9 from the area (A 1) 8. The region (B) 7 includes a front end side region (B 1) 10 and a rear end side region (B 2) 11 with respect to the region (B 1) 10. Thus, the region (B1) 10, the region (B2) 11, the region (A1) 8, and the region (A2) 9 are formed in this order in the brush portion 3 from the front end toward the rear end.

[Area (A)]
The region (A) 6 is a region that greatly contributes to the expression of the brushing force between the teeth in the brush portion 3.
In the region (A) 6, a plurality of first projecting pieces 5 a having an arbitrary height are arranged in the axial direction. In the region (A1) 8 on the front end side in the region (A) 6, the first protruding piece 5a having an arbitrary height and the second protruding piece 5b having a height lower than the first protruding piece 5a are provided in the axial direction. They are lined up alternately. In the rear end region (A2) 9, only the first projecting pieces 5a having an arbitrary height are arranged in the axial direction.
When the region (A) includes the region (A1) and the region (A2), the boundary between the region (A1) and the region (A2) in the axial direction of the shaft is determined so that the region (A2) is the widest. Shall be. Specifically, in this example, the region (A1) 8 is a region from the second projecting piece 5b on the most rear end side to the first projecting piece 5a on the most distal side. The region (A2) 9 is a region from the first projecting piece 5a located adjacent to the rear end side of the second projecting piece 5b on the most rear end side to the first projecting piece 5a on the most rear end side.

<First protruding piece>
The 1st protrusion piece 5a is a plate-shaped member for scraping off the plaque etc. which exist between teeth. The plate-like protruding piece has a high effect of scraping off plaque and the like.

As shown in FIG. 3, the first protruding piece 5 a protrudes radially as seen from the extending direction of the shaft member 4 so that the flat portion of the first protruding piece 5 a is orthogonal to the axial direction of the shaft member 4. Is provided. In this example, when viewed from the extending direction of the shaft member 4, first projecting pieces 5 a are provided around the shaft of the shaft member 4 in four directions at intervals of 90 °. That is, in the plane orthogonal to the shaft member 4, the four first protruding pieces 5 a are provided so as to protrude in the x-axis direction and the y-axis direction orthogonal to the x-axis direction.
The first protruding pieces 5a are preferably provided at equal intervals around the shaft 4 as described above.

  In this example, the number of the first protruding pieces 5a protruding radially when viewed from the extending direction of the shaft member 4 is four, but is not limited to four, and may be three or less. There may be more than one. It is preferable that at least two first protruding pieces 5a protrude radially when viewed from the extending direction of the shaft member 4.

  The front view shape of the first projecting piece 5a in this example is a rectangle whose height direction from the shaft member 4 is longer than the width direction, and both corners on the tip side are rounded. . In addition, the front view shape of the 1st protrusion piece 5a is not limited to the shape of this embodiment, For example, trapezoid shape, square shape, rectangular shape, substantially elliptical shape etc. whose width becomes narrow toward the front end, etc. Also good.

The first protruding piece 5 a has the highest height from the shaft member 4 among the protruding pieces provided on the brush portion 3. A high brushing force is obtained by the first protruding piece 5a provided in the region (A) 6.
The height of the first protruding piece 5a is preferably 0.7 to 1.5 mm, and more preferably 0.7 to 1.2 mm. If the height of the 1st protrusion piece 5a is more than a lower limit, a high brushing force will be easy to be obtained. If the height of the 1st protrusion piece 5a is below an upper limit, it will become easy to insert the brush part 3 between teeth.

  The thickness of the first protruding piece 5a is preferably 0.1 to 0.2 mm, and more preferably 0.10 to 0.15 mm. If the thickness of the 1st protrusion piece 5a is more than a lower limit, it can shape | mold easily by injection molding. If the thickness of the 1st protrusion piece 5a is below an upper limit, it will become easy to insert the brush part 3 between teeth.

<Second protruding piece>
The 2nd protrusion piece 5b is a plate-shaped member for scraping off the plaque etc. which exist between teeth, Comprising: The height from the shaft material 4 is lower than the height of the 1st protrusion piece 5a.
The aspect in which the 2nd protrusion piece 5b is provided in the shaft material 4 is the same as that of the case of the 1st protrusion piece 5a, and its preferable aspect is also the same. The number of second projecting pieces 5b that project radially from the extending direction of the shaft member 4 may be the same as the number of first projecting pieces 5a that project radially from the extending direction of the shaft member 4. Well, it can be different.

The front view shape of the second protruding piece 5b in this example is the same as that of the first protruding piece 5a except that the height from the shaft member 4 is lower than that of the first protruding piece 5a. The part is rounded.
The front view shape of the second protruding piece 5b may be a trapezoidal shape, a square shape, a rectangular shape, a substantially elliptical shape whose width becomes narrower toward the tip, or the like.

  The height of the 2nd protrusion piece 5b is 0.3-0.7 mm in the range lower than the height of the 1st protrusion piece 5a, and 0.3-0.5 mm is more preferable. If the height of the 2nd protrusion piece 5b is more than a lower limit, high brushing force will be easy to be obtained. If the height of the 2nd protrusion piece 5b is below an upper limit, it will become easy to insert the brush part 3 between teeth.

  The thickness of the second protruding piece 5b is preferably 0.1 to 0.2 mm, and more preferably 0.10 to 0.15 mm. If the thickness of the 2nd protrusion piece 5b is more than a lower limit, it can shape | mold easily by injection molding. If the thickness of the 2nd protrusion piece 5b is below an upper limit, it will become easy to insert the brush part 3 between teeth.

<Area (A1)>
In the region (A1) 8, the first protruding pieces 5a and the second protruding pieces 5b having a height lower than that of the first protruding pieces 5a are alternately arranged in the axial direction. Even if the first projecting piece 5a falls, the overlap between the first projecting pieces 5a is reduced because the adjacent second projecting piece 5b has a low height. Thereby, when the state which the 1st protrusion piece 5a fell in the area | region (A1) 8 was seen from the extending direction of the shaft member 4, the thickness is only when the 1st protrusion pieces 5a are located in a line at the same interval. It is thinner than that. Therefore, it becomes easy to insert the brush part 3 between teeth by providing the region (A1) 8.
As described above, the region (A1) 8 has a sufficient cleaning force by the first projecting piece 5a and enhances the insertion property between the teeth.

In the region (A1) 8 of this example, the first protruding pieces 5a and the second protruding pieces 5b are arranged in such a manner that the first protruding pieces 5a and the second protruding pieces 5b are alternately arranged in the axial direction. The arrangement of the shaft members 4 around the axis is not particularly limited. That is, if the first protruding pieces 5a and the second protruding pieces 5b are alternately arranged in the axial direction, the protruding pieces arranged around the shaft of the shaft member 4 are all the first protruding pieces 5a or the second protruding pieces 5b. The first projecting piece 5a and the second projecting piece 5b may be mixed.
In this example, a set in which the four first projecting pieces 5a project in the x-axis direction and the y-axis direction around the axis of the shaft member 4 and four fourth protrusions in the x-axis direction and the y-axis direction around the axis of the shaft member 4 are provided. The groups from which the two protruding pieces 5b protrude are alternately arranged in the axial direction. In addition to such a mode, for example, a pair in which two first protruding pieces 5a protrude in the x-axis direction around the axis of the shaft member 4 and two second protruding pieces 5b protrude in the y-axis direction, and the shaft member 4 A mode in which two second projecting pieces 5b project in the x-axis direction around the axis and two first projecting pieces 5a project in the y-axis direction are alternately arranged in the axial direction may be employed. .

  The axial distance between the adjacent first projecting piece 5a and second projecting piece 5b in the region (A1) 8 is preferably 0.3 to 0.8 mm, and has the same length as the height of the second projecting piece 5b. It is more preferable. If the said distance is more than a lower limit, the overlap with the 1st protrusion piece 5a and the 2nd protrusion piece 5b will be relieve | moderated comparatively, and it will be easy to improve the insertion property between teeth. If the distance is equal to or less than the upper limit value, it becomes easy to hold plaque between the first protruding piece 5a and the second protruding piece 5b, and a high brushing force is easily obtained.

  In this example, the total number of the first protruding pieces 5a and the second protruding pieces 5b arranged in the axial direction in the region (A1) 8 is 16. The total number is preferably 4 to 30, and more preferably 10 to 20. If the total number of the first projecting pieces 5a and the second projecting pieces 5b is within the above range, a function that achieves both the insertability of the region (A1) 8 and the brushing force is easily exhibited.

<Area (A2)>
In the area (A2) 9, since only the first projecting pieces 5a are arranged in the axial direction, the force for scraping off plaque and the like is strong, and a high brushing force is obtained.

  The distance in the axial direction between the adjacent first protruding pieces 5a in the region (A2) 9 is preferably 0.3 to 1.5 mm, and more preferably 1/2 to 0.8 mm of the height of the first protruding piece 5a. . If the distance is equal to or greater than the lower limit value, the overlap between the first protruding pieces 5a is relatively relaxed, and the insertion property between the teeth is likely to increase. If the distance is less than or equal to the upper limit value, it becomes easy to hold plaque between the first protruding pieces 5a, and a high brushing force can be easily obtained.

  In the region (A2) 9, the number of first protruding pieces 5a arranged in the axial direction is eight in this example. In the region (A2) 9, the number of the first protruding pieces 5a arranged in the axial direction is preferably 3 to 30, and more preferably 5 to 20. If the number of the 1st protrusion pieces 5a is in the said range, the high brushing force of area | region (A2) 9 will fully be exhibited easily.

In the present invention, in the region (A), it is preferable that the axial distance between the protruding pieces of any height described above increases toward the tip. Thereby, it becomes easy to insert the front end side of a field (A) between teeth.
For example, in this example, the axial distance between the first protruding pieces 5a in the region (A1) 8 is larger than the axial distance between the first protruding pieces 5a in the region (A2) 9. Thereby, even if the 1st protrusion piece 5a falls down when the area | region (A) 6 of the brush part 3 is inserted between teeth, compared with the area | region (A2) 9 in the area | region (A1) 8 of the front end side, it is 1st. The protruding pieces 5a are difficult to overlap. Therefore, when viewed from the extending direction of the shaft member 4, the thickness of the region (A 1) 8 where the distance between the first protruding pieces 5 a is large is thinner than the region (A 2) 9, and insertion between the teeth is performed. Improves.

[Area (B)]
The region (B) 7 is a region that has a brushing force and contributes to an improvement in insertability when the brush portion 3 is inserted between the teeth.
In the region (B1) 10 on the tip side in the region (B) 7, only the third projecting pieces 5c whose height from the shaft member 4 is lower than the first projecting pieces 5a are arranged in the axial direction. In the region (B2) 11 on the rear end side in the region (B) 7, only the fourth projecting pieces 5d whose height from the shaft member 4 is lower than the first projecting pieces 5a are arranged in the axial direction. That is, in the region (B) 7, only protruding pieces whose height is lower than that of the first protruding piece 5a are arranged in the axial direction. Further, the height of the fourth protruding piece 5d in the region (B2) 11 from the shaft member 4 is equal to or lower than the second protruding piece 5b in the region (A1) 8. The height of the third protruding piece 5c in the region (B1) 10 from the shaft member 4 is lower than the height of the fourth protruding piece 5d in the region (B2) 11.
As described above, the region (B1) 10, the region (B2) 11, the region (A1) 8, and the region (A2) 9 in the brush portion 3 are gradually expanded in diameter.
When the region (B) is composed of the region (B1) and the region (B2), the boundary between the region (B1) and the region (B2) in the axial direction of the shaft is determined so that the region (B2) is the widest. Shall be. Specifically, in this example, the region (B1) 10 is a region from the third projecting piece 5c on the most rear end side to the third projecting piece 5c on the most distal side. The region (B2) 11 is a region from the fourth projecting piece 5d on the most distal side to the fourth projecting piece 5d on the most rear end side.

<3rd projecting piece, 4th projecting piece>
The 3rd protrusion piece 5c and the 4th protrusion piece 5d are plate-shaped members for scraping off the plaque etc. which exist between teeth, Comprising: The height from the shaft material 4 is higher than the height of the 1st protrusion piece 5a. Is also low. The height of the third protruding piece 5c from the shaft member 4 is lower than the height of the fourth protruding piece 5d.

  The aspect in which the 3rd protrusion piece 5c and the 4th protrusion piece 5d are provided in the shaft material 4 is the same as that of the case of the 1st protrusion piece 5a, and its preferable aspect is also the same. Even if the number of the third protruding pieces 5c protruding radially when viewed from the extending direction of the shaft member 4 is the same as the number of the fourth protruding pieces 5d protruding radially when viewed from the extending direction of the shaft member 4, Well, it can be different.

The front-view shape of the third protruding piece 5c and the fourth protruding piece 5d in this example is the same as the first protruding piece 5a except that the height from the shaft member 4 is lower than that of the first protruding piece 5a. Both corners on the front end side are rounded.
The front view shape of the third protruding piece 5c and the fourth protruding piece 5d may be a trapezoidal shape, a square shape, a rectangular shape, a substantially elliptical shape whose width becomes narrower toward the tip, or the like.

  The height of the third protruding piece 5c is preferably in the range lower than the height of the fourth protruding piece 5d, preferably 0.1 to 0.5 mm, more preferably 0.1 to 0.3 mm. If the height of the 3rd protrusion piece 5c is more than a lower limit, it will be easy to obtain the feeling of brushing by a protrusion piece. If the height of the 3rd protrusion piece 5c is below an upper limit, the insertion property between the teeth of the brush part 3 will become higher.

  The thickness of the 3rd protrusion piece 5c may be the same as the 1st protrusion piece 5a and the 2nd protrusion piece 5b, and may be thicker than it. However, the upper limit is preferably 1.5 mm. If the thickness of the 3rd protrusion piece 5c is below an upper limit, high brushing force will be easy to be obtained.

  The height of the fourth projecting piece 5d is preferably 0.3 to 0.7 mm within a range lower than the height of the first projecting piece 5a and higher than the height of the third projecting piece 5c. 0.5 mm is more preferable. If the height of the 2nd protrusion piece 5b is more than a lower limit, high brushing force will be easy to be obtained. If the height of the 2nd protrusion piece 5b is below an upper limit, it will become easy to insert the brush part 3 between teeth.

  The thickness of the second protruding piece 5b is preferably 0.1 to 0.2 mm, and more preferably 0.10 to 0.15 mm. If the thickness of the 2nd protrusion piece 5b is more than a lower limit, it can shape | mold easily by injection molding. If the thickness of the 2nd protrusion piece 5b is below an upper limit, it will become easy to insert the brush part 3 between teeth.

<Region (B1), Region (B2)>
Since the region (B) 7 includes only the projecting piece lower than the first projecting piece 5 a, the region (B) 7 has a larger area than the region (A) 6 when viewed from the extending direction of the shaft member 4. The thickness becomes thinner. Therefore, the region (B) 7 is easier to insert between the teeth than the region (A) 6. Since the region (B) 7 on the distal end side of the brush portion 3 is easily inserted between the teeth, the subsequent region (A) 6 can also be stably inserted between the teeth.
Moreover, only the 4th protrusion piece 5d whose height is lower than the 1st protrusion piece 5a of the area | region (A) 6 is located in the area | region (B2) 11 in the axial direction. The height of the third protruding pieces 5c arranged in the region (B1) 10 is lower than the height of the fourth protruding pieces 5d arranged in the region (B2) 11. Thereby, since the front-end | tip part of the brush part 3 is thinner, compared with the aspect in which only the 4th protrusion piece 5d is located in the whole area | region (B) 7, the insertion property between the teeth of the area | region (B) 7 Is even higher.

  In this example, the number of the third protruding pieces 5c arranged in the axial direction in the region (B1) 10 is three. In the region (B1) 10, the number of the third protruding pieces 5c arranged in the axial direction is preferably 1 to 15, and more preferably 1 to 10. If the number of the 3rd protrusion pieces 5c is in the said range, the function which assists the interdental insertion property of area | region (B1) 10 will fully be exhibited easily.

  In the region (B2) 11, the number of the fourth protruding pieces 5d arranged in the axial direction is five in this example. In the region (B2) 11, the number of the fourth projecting pieces 5d arranged in the axial direction is preferably 1 to 20, and more preferably 3 to 10. If the number of the 4th protrusion pieces 5d is in the said range, the function which improves the interdental insertion property of the area | region (B2) 11 will fully be exhibited easily.

(Production method)
As a manufacturing method of the interdental brush of the present invention, a known manufacturing method can be adopted except that the height relation of the protruding pieces arranged in the axial direction is adjusted as described above. In the case of the interdental brush 1, for example, the first projecting piece 5a to the fourth projecting piece 5d are gold in which the above-described region (A1), region (A2), region (B1), and region (B2) are formed. There is a method of performing injection molding using a mold.

(Function and effect)
In the interdental brush of the present invention described above, the region (B) is provided on the front end side of the brush portion, and the region (A) is provided on the rear end side thereof. Both insertability can be achieved. Moreover, since the interdental brush of this invention is a product made from a synthetic resin, compared with the interdental brush provided with a wire, even if it hits gums etc., it is hard to feel a pain and a hit feeling is favorable.

The interdental brush of the present invention is not limited to the interdental brush 1 described above.
For example, the interdental brush of the present invention may be an interdental brush in which the region (A) is composed only of the region (A1), or may be an interdental brush in which the region (A) is composed only of the region (A2). Good. Further, the interdental brush of the present invention may be an interdental brush in which the region (B) is composed only of the region (B1), or may be an interdental brush in which the region (B) is composed only of the region (B2). Good.
When the region (B) is composed of the region (B1) and the region (B2), the protruding piece of the region (B1) has a height equal to or lower than the fourth protruding piece of the region (B2), and the region (B1) The 3rd protrusion piece lower than 4 protrusion piece should just be included. For example, the region (B1) may include both the third protruding piece and the fourth protruding piece. Specifically, in the region (B1), protruding pieces having the same height as the protruding pieces of the region (B2) and protruding pieces having a height lower than the protruding pieces of the region (B2) are alternately arranged in the axial direction. It may be a region.

  Further, the interdental brush of the present invention may be an interdental brush in which the tip portion 4c of the shaft member 4 is spherical as shown in FIG. The interdental brush is less likely to feel pain even when the tip portion 4c of the shaft member 4 hits the gingiva, and the contact comfort is better. In this case, the spherical tip 4c is preferably formed of a soft resin.

DESCRIPTION OF SYMBOLS 1 Interdental brush 2 Grasping part 2a Expanded diameter part 3 Brush part 4 Shaft material 4a Core part 4b Cover part 4c Tip part 5a 1st protrusion piece 5b 2nd protrusion piece 5c 3rd protrusion piece 5d 4th protrusion piece 6 area | region (A )
7 Area (B)
8 area (A1)
9 Area (A2)
10 area (B1)
11 area (B2)

Claims (5)

An interdental brush made of synthetic resin comprising a gripping part and a brush part provided at the tip of the gripping part,
The brush portion includes a shaft member extending from the tip of the gripping portion, and a plurality of protruding pieces that protrude from the shaft member and are arranged independently around the shaft ,
The protruding pieces protrude radially from the extending direction of the shaft member,
The brush portion includes a region (A) formed near the rear end, and a region (B) formed closer to the front end side than the region (A),
When the distance from the shaft member to the tip of the projecting piece projecting radially is the height,
In the region (A), first protruding pieces of arbitrary height are arranged in the axial direction,
In the region (B), only projecting pieces having a height lower than that of the first projecting piece are arranged in the axial direction .
The interdental brush , wherein the region (A) includes a region (A1) in which the first protruding pieces and second protruding pieces having a height lower than the first protruding pieces are alternately arranged in the axial direction . The area (B) includes a front end side area (B1) and a rear end side area (B2) from the area (B1),
In the region (B2), only the fourth projecting pieces having a height equal to or less than that of the second projecting pieces are arranged in the axial direction.
The protruding piece of the region (B1) has a height equal to or lower than that of the fourth protruding piece, and the region (B1) includes a third protruding piece whose height is lower than that of the fourth protruding piece. The interdental brush according to claim 1 . The interdental brush according to claim 1 or 2 , wherein in the region (A), an axial distance between the first protruding pieces increases toward the tip. The interdental brush according to any one of claims 1 to 3, wherein four or more first projecting pieces are arranged independently around the shaft of the shaft member. The interdental brush according to any one of claims 1 to 4, wherein a thickness of at least one of the first protruding piece and the second protruding piece is 0.1 to 0.2 mm.

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