JP7378014B2 - Oral cleaning tools - Google Patents

Description

The present disclosure relates to a nasal cavity cleaning device.

Foreign matter such as secretions from the nasal cavity or foreign substances may accumulate in the nasal cavity, and it is desirable to remove these foreign bodies. For example, when nasal mucus is secreted from the nasal cavity, discomfort is alleviated by removing the nasal mucus. Furthermore, according to the results of intensive research by the inventors of the present disclosure, when an allergen (allergy-causing substance) that can cause an allergic reaction enters the nasal cavity, the allergic reaction can be alleviated by sufficiently removing the allergen. There is expected.

As a device for removing foreign matter in the nasal cavity in this manner, a nasal cavity cleaning tool as disclosed in Patent Document 1, for example, is known. This nasal cavity cleaning tool is a so-called 360-degree brush in which a plurality of brush pieces each having a plurality of radially arranged bristles are stacked and held. Each of the plurality of brush pieces has a circular opening in the center, and is inserted into the nasal cavity by being fitted into a cylindrical shaft-shaped brush holding part formed to have approximately the same diameter as the opening. It makes up the department.

Utility model registration No. 3232109

In the nasal cavity cleaning tool described above, the brush part is rotated around the central axis of the brush holding part in a state where the brush part is inserted into the nasal cavity, and foreign matter in the nasal cavity is removed by the brush bristles. However, when such a nasal cavity cleaning tool is rotated around the central axis within the nasal cavity, the brush holder cannot fully hold the brush piece due to friction between the nasal cavity inner wall and the brush bristles, and the brush holding part becomes unable to hold the brush piece against the brush piece. There is a risk that the parts may spin idly. As a result, even if the gripping part and the brush holding part are rotated, the brush part remains stationary within the nasal cavity without being rotated, and the nasal cavity may not be effectively cleaned.

Therefore, the purpose of the nasal cavity cleaning tool according to the present disclosure is to suppress the brush holding part from idling with respect to the brush piece.

A nasal cavity cleaning tool according to one aspect of the present disclosure is a nasal cavity cleaning tool that is inserted into the nasal cavity to clean the nasal cavity, and includes a grip part that is gripped by a user, and a shaft-shaped brush that extends from the grip part. A holding part, and a plurality of brush pieces stacked on each other and held by the brush holding part, each of the plurality of brush pieces includes an annular part formed in an annular shape and a plurality of brush pieces provided on the outer peripheral surface of the annular part. It has a plurality of brush bristles, and is held by the brush holding part by being inserted into the annular part, and the brush holding part is held against the inner peripheral surface of the annular part of the brush piece being held. It has a locking portion that suppresses rotation of the brush piece around the central axis by being locked.

According to this nasal cavity cleaning tool, the brush part to be inserted into the nasal cavity is constructed by inserting the shaft-shaped brush holding part into the annular part of the plurality of brush pieces stacked on top of each other. Here, the brush holding portion is provided with a locking portion that locks onto the annular portion of the brush piece. Therefore, when the nasal cavity cleaning tool is rotated around the central axis within the nasal cavity, the brush holder is prevented from being unable to fully hold the brush pieces due to friction between the inner wall of the nasal cavity and the brush bristles, and the brush pieces are It can be rotated integrally with the holding part. Therefore, it becomes possible to suppress the brush holding portion from idling with respect to the brush piece.

In the nasal cavity cleaning tool according to one aspect of the present disclosure, the plurality of brush bristles may be provided radially outward from the outer circumferential surface of the annular portion over the entire circumference of the outer circumferential surface of the annular portion. According to this, the nasal cavity cleaner is rotated around the central axis with the brush portion inserted into the nasal cavity, thereby making it possible to effectively remove foreign matter within the nasal cavity.

In the nasal cavity cleaning tool according to one aspect of the present disclosure, the annular portion is formed in an annular shape, and the brush holding portion includes a cylindrical base portion and an outer peripheral surface of the base portion along the central axis of the brush holding portion. a rib-shaped locking part that extends from the center axis of the brush holding part to the top and has a larger outer diameter than the inner diameter of the annular part, and is inserted into the annular part by press-fitting to lock the brush holding part. The portion may be locked to the inner circumferential surface of the annular portion. According to this, since the brush piece can be more firmly locked to the brush holding part, it is possible to more reliably suppress idling of the brush holding part with respect to the brush piece.

In the nasal cavity cleaning tool according to one aspect of the present disclosure, in a cross section perpendicular to the central axis of the brush holding part, the top of the locking part is located at least in one direction perpendicular to the central axis. It may be located between two boundary parts between the stop part and the base part. According to this, when manufacturing the brush holder by injection molding, for example, it becomes easy to remove the brush holder from the mold.

In the nasal cavity cleaning tool according to one aspect of the present disclosure, each of the plurality of brush pieces may have the inner circumferential surface of the annular portion pushed apart by the locking portion when the brush holding portion is inserted through the annular portion. good. According to this, it is not necessary to previously form a depression corresponding to the locking part on the inner circumferential surface of the annular part, so that the brush piece can be manufactured easily. In addition, a pressing force is generated between the locking part and the inner circumferential surface of the annular part, and the brush piece can be more firmly locked to the brush holding part, thereby preventing the brush holding part from idling with respect to the brush piece. It becomes possible to suppress the noise more reliably.

In the nasal cavity cleaning tool according to one aspect of the present disclosure, the locking portion of the brush holding portion may be crushed by the inner circumferential surface of the annular portion when the brush holding portion is inserted through the annular portion. According to this, it is not necessary to previously form a depression corresponding to the locking part on the inner circumferential surface of the annular part, so that the brush piece can be manufactured easily. In addition, a pressing force is generated between the locking part and the inner circumferential surface of the annular part, and the brush piece can be more firmly locked to the brush holding part, thereby preventing the brush holding part from idling with respect to the brush piece. It becomes possible to suppress the noise more reliably.

In the nasal cavity cleaning tool according to one aspect of the present disclosure, the annular portion is formed in a polygonal annular shape with at least an inner peripheral surface having a polygonal shape, and the brush holding portion is formed in a polygonal column shape that fits into the annular portion, The locking portion may be a corner portion in a cross section perpendicular to the central axis of the brush holding portion. According to this, since the shapes of the locking portion and the inner circumferential surface of the annular portion correspond to each other, it is possible to more reliably suppress idling of the brush holding portion with respect to the brush piece.

In the nasal cavity cleaning tool according to one aspect of the present disclosure, the brush holding portion may fit loosely into the annular portion. According to this, it becomes easy to insert the brush holding part into the annular part.

In the nasal cavity cleaner according to one aspect of the present disclosure, each of the plurality of brush pieces may have side surfaces of the annular portions in contact with other adjacent brush pieces in a stacked state. According to this, the relative rotation of the brush pieces around the central axis is suppressed by the frictional force generated between the side surfaces of the annular portions of the brush pieces adjacent to each other. As a result, the plurality of brush pieces are locked to the brush holding part in cooperation with each other, so that it is possible to more reliably suppress the brush holding part from idling with respect to the brush pieces.

In the nasal cavity cleaning tool according to one aspect of the present disclosure, each of the plurality of brush pieces may have a convex portion formed on the side surface of the annular portion. According to this, the side surfaces of the annular portions of adjacent brush pieces are firmly connected to each other by the convex portions, and relative rotation of the brush pieces around the central axis is suppressed. As a result, the plurality of brush pieces are locked to the brush holding part in cooperation with each other, so that it is possible to more reliably suppress the brush holding part from idling with respect to the brush pieces.

In the nasal cavity cleaning tool according to one aspect of the present disclosure, the brush holding portion first has a wall portion on the gripping portion side that the annular portion of the brush piece that is inserted through the brush holding portion comes into contact with, and a wall portion that is inserted into the brush holding portion last. The brush piece may have a pressurizing lid portion that presses and holds the annular portion of the brush piece toward the grip portion along the central axis. According to this, since the plurality of brush pieces are pressurized and held by the wall portion of the brush holding portion and the pressurizing lid portion, it is possible to more reliably suppress idling of the brush holding portion with respect to the brush pieces.

In the nasal cavity cleaning tool according to one aspect of the present disclosure, the pressure lid portion may be formed by ultrasonic welding. According to this, it becomes easy to manufacture a nasal cavity cleaning tool having the above-described configuration.

In the nasal cavity cleaning device according to one aspect of the present disclosure, the length of the brush hairs of the plurality of brush pieces decreases from the gripping portion side toward the opposite side from the gripping portion at least at the end opposite to the gripping portion. It may be formed as follows. According to this, since the brush portion has a tapered shape, the brush portion can be easily inserted into the nasal cavity. Moreover, when the brush piece located at the end opposite to the grip part is supported by a small-diameter lid part, it becomes difficult to ensure a frictional force between the side surface of the brush piece and the lid part. Here, by shortening the length of the bristles of the brush piece, the torque acting on the brush piece due to friction between the inner wall of the nasal cavity and the bristles becomes smaller, so that the side surface of the brush piece and the lid part become smaller. It is possible to prevent the torque from exceeding the frictional force. Therefore, idling of the brush holding portion relative to the brush piece can be more reliably suppressed.

In this manner, the nasal cavity cleaning tool according to the present disclosure can suppress the brush holding portion from rotating idly with respect to the brush piece.

FIG. 1 is a diagram showing a nasal cavity cleaning tool according to a first embodiment. FIG. 2 is a diagram showing the gripping section and the brush holding section before the brush section is provided. FIG. 3 is a view of the brush piece viewed in the central axis direction. FIG. 4 is a sectional view including the central axis of a pair of brush pieces having a shell structure. FIG. 5 is a sectional view taken along the line V-V in FIG. 2, and is a view of the brush holding part having the locking part as viewed in the central axis direction. FIG. 6 is a diagram showing a state in which the locking portion is locked to the inner circumferential surface of the brush piece. FIG. 7 is a sectional view including the central axis of a brush piece in which a convex portion is formed on the side surface of an annular portion. FIG. 8 is a diagram showing a state in which the locking portion is locked to the inner circumferential surface of the brush piece in the nasal cavity cleaning tool according to the second embodiment. FIG. 9 is a view of a brush holding part having a locking part viewed in the central axis direction in the nasal cavity cleaning tool according to the third embodiment. FIG. 10 is a view of a brush holding part having a locking part viewed in the central axis direction in the nasal cavity cleaning tool according to the fourth embodiment. FIG. 11 is a diagram showing a state in which the locking portion is locked to the inner circumferential surface of the brush piece in the nasal cavity cleaning tool according to the fifth embodiment. FIG. 12 is a diagram showing a state in which the locking portion is locked to the inner circumferential surface of the brush piece in the nasal cavity cleaning tool according to the sixth embodiment.

Hereinafter, exemplary embodiments will be described with reference to the drawings. Note that the same or corresponding parts in each figure are given the same reference numerals, and redundant explanation will be omitted.

[First embodiment]
[overall structure]
FIG. 1 is a diagram showing a nasal cavity cleaning tool 100 according to a first embodiment. FIG. 2 is a diagram showing the grip part 1 and the brush holding part 2 before the brush part 3 is provided. FIG. 3 is a diagram of the brush piece 30 viewed in the central axis X direction. FIG. 4 is a sectional view including the central axis X of a pair of brush pieces 30 having an interlocking structure. In the following description, the "center axis" is a virtual line passing through the center of the brush holding part 2 of the nasal cavity cleaning tool 100. Moreover, in the brush part 3 before being attached to the brush holding part 2, the central axis X is a virtual axis that passes through the center of the brush holding part 2 when the brush part 3 is attached to the brush holding part 2. It is a line.

As shown in FIGS. 1 to 4, the nasal cavity cleaning tool 100 is an instrument that is inserted into the nasal cavity and used to clean the nasal cavity. Specifically, the nasal cavity cleaning tool 100 is configured as a so-called 360-degree brush, and can remove foreign matter accumulated in the nasal cavity by being inserted into the nasal cavity and rotated. The "nasal cavity" is the internal space of the nose, and may be, for example, the space between the nostrils (openings corresponding to air entrances and exits) and the nasal turbinates (fold-shaped parts at the back of the nose). A "foreign object" is an object to be removed from the nasal cavity, and may be a secretion from the nasal cavity or an intrusion from the outside. Secretions from the nasal cavity may be, for example, nasal discharge. In addition, the external invader may be, for example, various allergens that can cause an allergic reaction. The nasal cavity cleaning tool 100 may be called a nasal brush, a nasal cavity brush, or the like, or a nasal cleaning tool, a nasal cavity cleaning tool, or the like.

First, the overall configuration of the nasal cavity cleaning tool 100 will be described. The nasal cavity cleaning tool 100 includes a grip part 1, a brush holding part 2, and a brush part 3.

The grip part 1 is a part that is gripped by a user. The "user" is a person who operates the nasal cavity cleaning tool 100, and may be a person (the user) whose nasal cavity is to be cleaned by the nasal cavity cleaning tool 100, or a person other than the user (other person). It's okay. The grip part 1 has a main body part 10.

The main body portion 10 is a portion held in the user's hand. The main body portion 10 is an elongated member extending along the central axis X. From the viewpoint of operability of the nasal cavity cleaning tool 100, the main body 10 may preferably have a length of 8 cm or more and 18 cm or less, more preferably 10 cm or more and 13 cm or less, and even more preferably may have a length of 11 cm or more and 12 cm or less. The main body portion 10 may be made of hard plastic, for example. The main body portion 10 may be formed by injection molding, for example.

Here, the main body portion 10 extends linearly along the central axis X, and has a circular cross section perpendicular to the central axis X. As a result, the user can rotate the nasal cavity cleaning tool 100 around the central axis X in his/her hands by reciprocating his or her fingers in a direction orthogonal to the central axis X while gripping the main body 10. Become. In other words, the main body 10 has a configuration that can be rotated in the hand. The diameter of the main body part 10 decreases toward the distal end of the nasal cavity cleaner 100 (that is, the end on the side of the brush holding part 2 and the brush part 3 with respect to the grip part 1 in the central axis X direction). In other words, the main body portion 10 has a truncated conical shape whose diameter decreases toward the distal end of the nasal cavity cleaning tool 100.

The main body 10 is located at the proximal end of the nasal cavity cleaner 100 (that is, the end on the side opposite to the tip in the direction of the central axis X and on the side of the gripping part 1 with respect to the brush holding part 2 and the brush part 3). ) has a through hole 10a penetrating in a direction perpendicular to the central axis X. The through hole 10a may be used, for example, to pass a string or the like.

The brush holding portion 2 is a shaft-shaped portion extending from the main body portion 10 of the gripping portion 1, and is inserted into the brush piece 30 described below (that is, by being inserted and passed through). hold. The brush holding part 2 may be formed integrally with the grip part 1, or may be formed separately from the grip part 1 and then connected to the grip part 1 by any means. The brush holding section 2 has a base end block section 20, a shaft section 21, and a pressurizing lid section 22.

The base end block portion 20 is a portion provided adjacent to the main body portion 10 of the grip portion 1. The proximal block portion 20 may be made of hard plastic, for example. The proximal block portion 20 may be formed by injection molding, for example. The proximal block portion 20 includes a wall portion 20a that is a surface perpendicular to the central axis X on the distal end side of the nasal cavity cleaner 100. The wall portion 20a is a surface against which the annular portion 31 of the brush piece 30 first inserted into the brush holding portion 2 (details will be described later). Here, the wall portion 20a is configured as a surface perpendicular to the central axis X.

The shaft portion 21 is a portion through which the brush piece 30 is inserted. In other words, the shaft portion 21 is a portion that functions as a central axis of the brush portion 3 when the brush portion 3 is constituted by a plurality of brush pieces 30 inserted through the shaft portion 21 . The shaft portion 21 is an elongated portion extending along the central axis X. The shaft portion 21 is formed to have a smaller diameter than the base end block portion 20. The shaft portion 21 has the same diameter over its entire length from the end of the shaft portion 21 on the base end side of the nasal cavity cleaning tool 100 to the end of the shaft portion 21 on the distal end side of the nasal cavity cleaning tool 100. The shaft portion 21 may be made of hard plastic, for example. The shaft portion 21 may be formed by injection molding, for example.

The shaft portion 21 is not provided with any special structure on the distal end side before the brush portion 3 is provided on the brush holding portion 2 in the manufacturing process of the nasal cavity cleaning tool 100 (see FIG. 2). On the other hand, after the brush portion 3 is provided on the brush holding portion 2 in the manufacturing process of the nasal cavity cleaning device 100, the end of the shaft portion 21 on the distal end side of the nasal cavity cleaning device 100 is crushed and the lid portion is closed. It is formed.

The pressure lid part 22 is the lid part mentioned above, and is fixed in a state in which the brush piece 30 of the brush part 3 is pressed against the grip part 1 side. That is, the pressurizing lid part 22 presses and holds the annular part 31 of the brush piece 30 that was last inserted into the brush holding part 2 toward the grip part 1 along the central axis X (details will be described later). do). The pressure lid part 22 is formed by ultrasonic welding from the tip side of the nasal cavity cleaner 100 after the brush holding part 2 is inserted through all the brush pieces 30 . Specifically, the pressure lid part 22 is formed by bringing a curved concave member into contact with the tip of the shaft part 21 and melting the shaft part 21. The outer diameter of the pressurizing lid part 22 is larger than the outer diameter of the shaft part 21. The outer diameter of the pressurizing lid part 22 may be larger than the outer diameter of the shaft part 21 by 0.5 mm or more and 2 mm or less, 0.7 mm or more and 1.5 mm or less, or 0.9 mm or more. It may be larger by 1.2 mm or less. The larger the outer diameter of the pressurizing lid part 22 is than the outer diameter of the shaft part 21, the more the brush piece 30 is prevented from falling off and idling. On the other hand, the smaller the outer diameter of the pressurizing lid part 22, the more the discomfort such as getting caught in the nasal cavity is reduced.

The brush portion 3 is a portion that is inserted into the nasal cavity to clean the nasal cavity. The brush portion 3 is a so-called 360-degree brush portion. Specifically, the brush portion 3 is configured such that a large number of brush bristles 32 of the brush piece 30 are provided radially outward in the entire circumferential direction around the central axis X. From the viewpoint of efficiency in cleaning the nasal cavity, the brush portion 3 may preferably be provided with 10,000 or more brush bristles 32, more preferably 30,000 or more brush bristles 32. More preferably, 60,000 or more brush bristles 32 may be provided. Here, the brush portion 3 is provided with 70,000 brush bristles 32. The larger the number of bristles 32 provided in the brush part 3 (the higher the density), the better the performance of cleaning the nasal cavity. It is preferable to increase the number of 32 (increase the density). In addition, from the viewpoint of efficiency in cleaning the nasal cavity, the number of brush bristles 32 provided in the brush part 3 may be 100,000 or more, but from the viewpoint of making it easier to wash away foreign substances attached to the brush part 3, The number of brush bristles 32 provided may be less than 100,000.

The brush section 3 is composed of a plurality of brush pieces 30 that are stacked on each other and held by the brush holding section 2 . Further, the brush portion 3 has a same diameter portion 3a and a reduced diameter portion 3b in its overall shape. The same diameter portion 3a is a portion where the outer shape of the same diameter portion 3a exhibits a cylindrical shape with the same diameter along the central axis X direction. Each brush piece 30 constituting the same diameter portion 3a has a common outer diameter, and for example, the outer diameter may be between 10 mm and 21 mm, or between 16 mm and 20 mm. The outer diameter may be a numerical value of 17 mm or more and 19 mm or less. On the other hand, the reduced diameter portion 3b is a portion in which the outer shape of the reduced diameter portion 3b is a truncated cone shape whose diameter is reduced toward the distal end side of the nasal cavity cleaning tool 100 along the central axis X direction. Among the plurality of brush pieces 30 constituting the reduced diameter part 3b, the brush piece 30 closest to the tip of the nasal cavity cleaning tool 100 has an outer diameter smaller than the other brush pieces 30, for example, any diameter between 7 mm and 14 mm. The outer diameter may be any numerical value between 10.5 mm and 13.5 mm, and the outer diameter may be any numerical value between 11 mm and 13 mm. It's okay. In the cross section including the central axis X, the angle between the outer shape of the reduced diameter portion 3b (envelope of the tip of the brush bristles 32) and the central axis X may be 35 degrees or more and 50 degrees or less, and may be 40 degrees or more and 45 degrees. It may be the following.

Each brush piece 30 includes an annular portion 31 and a plurality of bristles 32. In each brush piece 30, the annular portion 31 has the same shape and size. On the other hand, in each brush piece 30, the lengths of the brush bristles 32 are not necessarily common, and thereby the same diameter portion 3a and the reduced diameter portion 3b are realized.

The annular portion 31 is the central portion of the brush piece 30. The annular portion 31 is formed in an annular shape. "Ring" means a closed ring, and includes circular rings, rectangular rings, polygonal rings, and the like. Specifically, the annular portion 31 is formed in an annular shape. More specifically, the annular portion 31 is formed into an annular shape in which at least the inner circumferential surface 31b is circular when viewed in the central axis X direction, and the outer circumferential surface 31a is also circular in shape when viewed in the central axis X direction. is formed. The outer diameter of the annular portion 31 may be larger than the outer diameter of the pressurizing lid portion 22. The annular portion 31 may be made of nylon or polybutylene terephthalate resin, for example. Each brush piece 30 is held by the brush holding part 2 by inserting the shaft part 21 of the brush holding part 2 into the annular part 31 .

The brush bristles 32 are portions for scraping out foreign matter in the nasal cavity, and are formed in the shape of flexible and elastic bristles. A plurality of brush bristles 32 are provided on the outer peripheral surface 31a of the annular portion 31. Each brush bristle 32 is provided radially outward from the outer circumferential surface 31 a of the annular portion 31 over the entire circumference of the outer circumferential surface 31 a of the annular portion 31 . In other words, the plurality of brush bristles 32 are provided on the outer peripheral surface 31a of the annular portion 31 over 360 degrees. The brush bristles 32 may be made of, for example, nylon or polybutylene terephthalate resin. According to this, when the brush bristles 32 are soaked in hot water or the like, the flexibility of the brush bristles 32 increases and the feeling of use is improved. . Each brush bristle 32 may be formed to have a thickness of approximately 0.05 mm.

Each brush piece 30 constituting the same diameter portion 3a has the same length of bristles 32. On the other hand, in each brush piece 30 constituting the reduced diameter portion 3b, the length of the brush bristles 32 becomes shorter as the length approaches the tip end of the nasal cavity cleaning tool 100. In other words, each brush piece 30, at least at the end opposite to the grip 1 (the end on the distal end side of the nasal cavity cleaning tool 100), has a shape that extends from the grip 1 side toward the opposite side from the grip 1. The brush bristles 32 are formed to have a short length. Thereby, each brush piece 30 constitutes a reduced diameter portion 3b of the brush portion 3.

Each of the brush pieces 30 configured in this way is held by the shaft portion 21 of the brush holding portion 2 in a state in which they are stacked on each other so that the positions of the annular portions 31 match (the shaft portion 21 of the brush holding portion 2 is inserted). In each brush piece 30, the side surfaces 31c of the annular portions 31 of each brush piece 30 are in contact with other adjacent brush pieces 30 in a stacked state. Note that the side surfaces 31c of the annular portion 31 are surfaces on both sides of the annular portion 31 in the central axis X direction.

Note that each brush bristle 32 is provided with a slight inclination in either direction of the central axis X with respect to a plane perpendicular to the central axis X. That is, the brush piece 30 is not completely flat, but slightly funnel-shaped. Each brush piece 30 forms a pair of two pieces to form a shell structure. The "shell structure" is a structure in which a pair of brush bristles 32 are combined so that the concave sides of the funnel-shaped brush pieces 30 face each other (see FIG. 4). As a result, the side surfaces 31c of the pair of brush pieces 30 that face each other come into contact with each other, and the tips of the brush bristles 32 come into contact with or intersect with each other. The brush portion 3 is constructed by laminating a large number (for example, eight) of brush pieces 30 having a shell-like structure. As a result, when the nasal cavity cleaning tool 100 is used, foreign matter in the nasal cavity collects in a lump and is accommodated in the gap between adjacent shell structures, improving the efficiency of cleaning the nasal cavity. Furthermore, since foreign matter is less likely to enter the roots of the brush bristles 32, foreign matter adhering to the brush portion 3 can be easily washed away. Further, although the nasal cavity cleaning tool 100 uses ultra-fine brush bristles 32, by adopting a shell structure, the brush portion 3 with sufficient stiffness can be realized even with the ultra-fine bristles 32. .

[Slip suppression structure]
Next, an idle rotation suppressing structure that is a structure for suppressing idle rotation of the brush holding part 2 with respect to the brush piece 30 in the nasal cavity cleaning tool 100 will be described.

FIG. 5 is a sectional view taken along the line V-V in FIG. 2, and is a view of the brush holding part 2 having the locking part 26 viewed in the central axis X direction. FIG. 6 is a diagram showing a state in which the locking portion 26 is locked to the inner peripheral surface 31b of the brush piece 30. As shown in FIGS. 5 and 6, the nasal cavity cleaner 100 prevents the brush holder 2 from idling relative to the brush piece 30 by the locking part 26 provided on the brush holder 2. The brush holding part 2 has a base part 25 and a locking part 26.

The base portion 25 is the main portion of the shaft portion 21 of the brush holding portion 2 . The base portion 25 has a cylindrical shape with an outer diameter that is the same as or slightly larger than the inner diameter of the annular portion 31 . The outer diameter of the base portion 25 may be larger than the inner diameter of the annular portion 31 by, for example, 0 mm or more and 0.3 mm or less, 0.03 mm or more and 0.2 mm or less, or 0.05 mm or more and 0.1 mm. It may be larger than the following. That is, even if the locking portion 26 is not provided, the base portion 25 is press-fitted into the annular portion 31 while pushing the inner circumferential surface 31b of the annular portion 31 apart. Note that the base portion 25 may have a cylindrical shape with an outer diameter smaller than the inner diameter of the annular portion 31. In this case, the base portion 25 will loosely fit into the annular portion 31 of the brush piece 30 if the locking portion 26 is not provided.

The locking part 26 is locked to the inner peripheral surface 31b of the annular part 31 of the brush piece 30 held by the brush holding part 2 (shaft part 21), thereby preventing rotation of the brush piece 30 (brush holding part 21). 2) is suppressed. "Locked" means that the structures engage with each other, and means a state in which asynchronous rotation around the central axis X is restricted to a certain extent or more. "Locking" may include, for example, at least one of hooking, biting, pressurizing, and the like.

The locking portion 26 is a rib-shaped structural portion extending along the central axis X of the brush holding portion 2 on the outer circumferential surface 25 a of the base portion 25 . The brush holding part 2 has six locking parts 26 here. The locking portion 26 is provided symmetrically with respect to a predetermined direction (here, the reference direction D in FIG. 5) that intersects with the central axis X and is perpendicular to the central axis X. More specifically, the locking portion 26 is provided symmetrically with respect to a plane including the central axis X and the reference direction D. The outer diameter of the locking portion 26 from the central axis X of the brush holding portion 2 to the top 26a of the locking portion 26 (that is, the highest part of the ribs forming the locking portion 26) is larger than the inner diameter of the annular portion 31. It is also designed to become larger. The outer diameter of the locking portion 26 (the outer diameter from the central axis X to the top portion 26a) may be larger than the inner diameter of the annular portion 31 by, for example, 0.05 mm or more and 0.6 mm or less, and 0.1 mm or more and 0.6 mm or less. It may be larger by 5 mm or less, or may be larger by 0.15 mm or more and 0.4 mm or less. However, the outer diameter of the locking portion 26 is larger than the outer diameter of the base portion 25.

The brush holding part 2 having such a locking part 26 is inserted into the annular part 31 by press fitting, thereby locking the locking part 26 to the inner circumferential surface 31b of the annular part 31. In each brush piece 30, the inner circumferential surface 31b of the annular portion 31 is pushed apart by the locking portion 26 in a state in which the brush holding portion 2 is inserted into the annular portion 31. In other words, the locking portion 26 is formed to have higher strength than the inner circumferential surface 31b of the annular portion 31. As the inner circumferential surface 31b of the annular portion 31 is pushed apart by the locking portion 26 in this manner, the portion of the inner circumferential surface 31b remaining between the adjacent locking portions 26 causes the locking portion 26 to be expanded. Rotational movement around the central axis X can be suppressed. In addition, the frictional force acting between the locking portion 26 and the inner peripheral surface 31b increases due to the repulsive force from the inner peripheral surface 31b pushed apart by the locking portion 26, and the locking portion 26 rotates around the central axis X. Rotational movement can be further suppressed.

In addition, in a cross section perpendicular to the central axis X of the brush holding part 2, the locking part 26 is located in the locking position when viewed in at least one direction perpendicular to the central axis X (here, the reference direction D in FIG. 5). The top portion 26a of the portion 26 is formed so as to be located between the two boundary portions 26b between the locking portion 26 and the base portion 25 (the positions of the three parallel lines shown in FIG. 5). (see relationships). That is, in a cross section perpendicular to the central axis X of the brush holding part 2, when viewed in the reference direction D, one boundary part 26b, the top part 26a, and the other boundary part 26b are lined up in this order. Here, the “boundary portion” is a boundary between the base portion 25 and the locking portion 26, and exists on both sides of each locking portion 26. Therefore, to put the above in another way, of the three parallel lines shown in FIG. 5, the part pointed to by the center line is the top part 26a, and the parts pointed to by the left and right lines are the boundary parts 26b. Then, at least one reference direction D is found in which the one boundary portion 26b, the top portion 26a, and the other boundary portion 26b are arranged in this order. In addition, in a cross section perpendicular to the central axis X of the brush holding part 2, when viewed in the reference direction D, the locking part 26 has a monotonous slope from one boundary part 26b toward the top part 26a (that is, in the reference direction D). (inclined in only one direction). Further, in a cross section perpendicular to the central axis X of the brush holding portion 2, the locking portion 26 has a monotonous slope from the top portion 26a toward the other boundary portion 26b when viewed in the reference direction D. That is, the locking part 26 has a so-called draft angle, and when manufacturing the brush holding part by injection molding, for example, it becomes easy to remove the brush holding part 2 from the mold.

FIG. 7 is a sectional view including the central axis X of the brush piece 30 in which a convex portion 31d is formed on the side surface 31c of the annular portion 31. As shown in FIG. 7, each brush piece 30 has a convex portion 31d formed on a side surface 31c of an annular portion 31. As shown in FIG. Therefore, each brush piece 30 is separated from other brush pieces 30 adjacent to each other by the convex portion 31d formed on the side surface 31c of the annular portion 31 (that is, due to the convex portion 31d). (by increasing the frictional force) relative rotation around the central axis X is suppressed. Note that although the convex portion 31d is formed only on one side surface 31c of the annular portion 31 in FIG. 7, the convex portion 31d may be formed on both side surfaces 31c of the annular portion 31. The convex portion 31d may be, for example, a burr formed in the manufacturing process of the brush piece 30.

The brush pieces 30 are inserted into the shaft part 21 of the brush holding part 2 and stacked on top of each other to form the brush part 3 . At this time, the annular portion 31 of the brush piece 30 that is first inserted into the shaft portion 21 of the brush holding portion 2 abuts against the wall portion 20a of the base end block portion 20. Further, the annular portion 31 of the brush piece 30 that is finally inserted into the shaft portion 21 of the brush holding portion 2 is pressed and held toward the grip portion 1 side along the central axis X by the pressurizing lid portion 22. As a result, frictional force is generated between the side surfaces 31c of the respective annular portions 31 in the brush pieces 30 adjacent to each other. Further, in the brush pieces 30 at both ends, a frictional force is generated between the side surface 31c of the annular portion 31 and the wall portion 20a of the base end block portion 20 or the pressurizing lid portion 22. As a result, the plurality of brush pieces 30 are locked to the brush holding part 2 in cooperation with each other.

[Action and effect]
As explained above, the nasal cavity cleaning tool 100 is an instrument that is inserted into the nasal cavity to clean the nasal cavity. The nasal cavity cleaning tool 100 includes a grip part 1 held by a user, a shaft-shaped brush holding part 2 extending from the grip part 1, and a plurality of brush pieces 30 stacked on each other and held by the brush holding part 2. Each of the plurality of brush pieces 30 has an annular portion 31 formed in an annular shape and a plurality of brush bristles 32 provided on the outer peripheral surface 31a of the annular portion 31. The brush holding part 2 is held by the brush holding part 2 by being inserted through the shaft part 21, and the brush holding part 2 is locked to the inner circumferential surface 31b of the annular part 31 of the brush piece 30 being held. It has a locking portion 26 that suppresses the rotation of the brush piece 30 about the central axis X.

According to the nasal cavity cleaning tool 100, the brush part 3 to be inserted into the nasal cavity is constructed by inserting the shaft-shaped brush holding part 2 through the annular part 31 of the plurality of brush pieces 30 stacked on top of each other. Here, the brush holding portion 2 is provided with a locking portion 26 that locks onto the annular portion 31 of the brush piece 30. Therefore, when the nasal cavity cleaning tool 100 is rotated around the central axis X within the nasal cavity, the brush holder 2 is prevented from being unable to fully retain the brush piece 30 due to friction between the nasal cavity inner wall and the brush bristles 32. , the brush piece 30 can be rotated integrally with the brush holding part 2. Therefore, it becomes possible to suppress the brush holding part 2 from idling with respect to the brush piece 30. Moreover, according to the nasal cavity cleaning tool 100, a large amount of brush bristles 32 can be easily achieved, which is difficult to achieve with conventionally known twisted brushes and flocked brushes. Note that a twisted brush is a brush with a main shaft made by twisting a member such as a wire, and a brush portion is formed by pinching the brush bristles when the wire or the like is twisted. On the other hand, a flocked brush is a brush in which a brush portion is formed by implanting brush bristles into the main shaft. In these twisted brushes and flocked brushes, while it is difficult to increase the amount of hair, the problem of the brush holding part 2 idling with respect to the brush piece 30 as in the present disclosure does not generally occur.

In the nasal cavity cleaner 100, the plurality of brush bristles 32 are provided radially outward from the outer circumferential surface 31a of the annular portion 31 over the entire circumference of the outer circumferential surface 31a of the annular portion 31. According to this, by rotating the nasal cavity cleaning tool 100 around the central axis X while the brush portion 3 is inserted into the nasal cavity, it becomes possible to effectively remove foreign substances in the nasal cavity.

In the nasal cavity cleaning tool 100, the annular part 31 is formed in an annular shape, and the brush holding part 2 has a cylindrical base part 25 and an outer circumferential surface 25a of the base part 25 along the central axis X of the brush holding part 2. It has a rib-shaped locking part 26 that extends from the central axis X of the brush holding part 2 to the top 26a and has a larger outer diameter than the inner diameter of the annular part 31, and is inserted into the annular part 31 by press fitting. As a result, the locking portion 26 is locked to the inner circumferential surface 31b of the annular portion 31. According to this, since the brush piece 30 can be more firmly locked to the brush holding part 2, it becomes possible to suppress the idling of the brush holding part 2 with respect to the brush piece 30 more reliably.

In the nasal cavity cleaning tool 100, the locking portion 26 is configured such that, when viewed in at least one direction (reference direction D) perpendicular to the central axis X, in a cross section perpendicular to the central axis X of the brush holding portion 2, the locking portion 26 The top portion 26a is located between two boundary portions 26b between the locking portion 26 and the base portion 25. According to this, when manufacturing the brush holding part 2 by injection molding, for example, it becomes easy to remove the brush holding part 2 from the mold.

In the nasal cavity cleaning tool 100, in each of the plurality of brush pieces 30, the inner circumferential surface 31b of the annular part 31 is pushed apart by the locking part 26 in a state where the brush holding part 2 is inserted into the annular part 31. According to this, it is not necessary to previously form a depression corresponding to the locking part 26 on the inner circumferential surface 31b of the annular part 31, so that the brush piece 30 can be manufactured easily. Further, a pressing force is generated between the locking portion 26 and the inner circumferential surface 31b of the annular portion 31, and the brush piece 30 can be more firmly locked to the brush holding portion 2. It becomes possible to suppress idling of the brush holding part 2 more reliably.

In the nasal cavity cleaner 100, each of the plurality of brush pieces 30 is stacked on top of another, and the side surfaces 31c of the respective annular portions 31 are in contact with other adjacent brush pieces 30. According to this, the relative rotation of the brush pieces 30 around the central axis X is suppressed by the frictional force generated between the side surfaces 31c of the annular portions 31 of the brush pieces 30 adjacent to each other. As a result, since the plurality of brush pieces 30 are locked to the brush holding part 2 in cooperation with each other, idling of the brush holding part 2 with respect to the brush pieces 30 can be suppressed more reliably.

In the nasal cavity cleaner 100, each of the plurality of brush pieces 30 has a convex portion 31d formed on a side surface 31c of the annular portion 31. According to this, the side surfaces 31c of the annular portions 31 of the brush pieces 30 adjacent to each other are firmly connected by the convex portion 31d, and relative rotation of the brush pieces 30 about the central axis X is suppressed. As a result, since the plurality of brush pieces 30 are locked to the brush holding part 2 in cooperation with each other, idling of the brush holding part 2 with respect to the brush pieces 30 can be suppressed more reliably.

In the nasal cavity cleaning tool 100, the brush holding part 2 is first inserted into the wall part 20a of the grip part 1, which the annular part 31 of the brush piece 30 that is inserted into the brush holding part 2 comes into contact with, and finally the brush holding part 2 is inserted into the brush holding part 2. It has a pressurizing lid part 22 that presses and holds the annular part 31 of the brush piece 30 along the central axis X toward the grip part 1 side. According to this, since the plurality of brush pieces 30 are pressurized and held by the wall 20a of the brush holding part 2 and the pressurizing lid part 22, idling of the brush holding part 2 with respect to the brush pieces 30 is more reliably suppressed. can do.

In the nasal cavity cleaner 100, the pressure lid portion 22 is formed by ultrasonic welding. According to this, it becomes easy to manufacture the nasal cavity cleaning tool 100 having the above-described configuration.

In the nasal cavity cleaning tool 100, the length of the brush bristles 32 of the plurality of brush pieces 30 becomes shorter as it goes from the gripping part 1 side to the opposite side of the gripping part 1, at least at the end opposite to the gripping part 1. It is formed like this. According to this, since the brush portion 3 has a tapered shape, the brush portion 3 can be easily inserted into the nasal cavity. In addition, when the brush piece 30 located at the end opposite to the grip part 1 is supported by a small-diameter lid part, the frictional force between the side surface 31c of the annular part 31 of the brush piece 30 and the lid part is ensured. It becomes difficult to do. Here, by shortening the length of the brush bristles 32 of the brush piece 30, the torque acting on the brush piece 30 due to the friction between the nasal cavity inner wall and the brush bristles 32 becomes smaller, so that the brush piece 30 It is possible to prevent the torque from exceeding the frictional force between the side surface 31c of the annular portion 31 and the lid portion. Therefore, idling of the brush holding part 2 with respect to the brush piece 30 can be suppressed more reliably.

[Second embodiment]
FIG. 8 is a diagram showing a state in which the locking portion 26 is locked to the inner circumferential surface 31b of the brush piece 30 in the nasal cavity cleaning tool 100A according to the second embodiment. As shown in FIG. 8, the nasal cavity cleaning tool 100A according to the second embodiment is different from the nasal cavity cleaning implement 100 according to the first embodiment in that the inner circumferential surface 31b of the brush piece 30 and the locking part 26 are They differ mainly in the state of the contacts, but are common in other respects.

In the nasal cavity cleaner 100A, when the brush holding part 2 is inserted into the annular part 31, the locking part 26 is crushed by the inner circumferential surface 31b of the annular part 31. That is, the locking portion 26 is formed to have lower strength than the inner circumferential surface 31b of the annular portion 31. When the locking portion 26 is crushed by the inner circumferential surface 31b of the annular portion 31 in this way, a frictional force acts between the locking portion 26 and the inner circumferential surface 31b due to the repulsive force from the crushed locking portion 26. is increased, and rotational movement of the locking portion 26 around the central axis X can be further suppressed. In addition, when the brush holding part 2 is inserted into the annular part 31, the locking part 26 is crushed by the inner circumferential surface 31b of the annular part 31, and the inner circumferential surface 31b of the annular part 31 is pushed and expanded by the locking part 26. It may be.

In this manner, in the nasal cavity cleaner 100A, the locking portion 26 of the brush holding portion 2 is crushed by the inner circumferential surface 31b of the annular portion 31 when the brush holding portion 2 is inserted through the annular portion 31. According to this, it is not necessary to previously form a depression corresponding to the locking part 26 on the inner circumferential surface 31b of the annular part 31, so that the brush piece 30 can be manufactured easily. Further, a pressing force is generated between the locking portion 26 and the inner circumferential surface 31b of the annular portion 31, and the brush piece 30 can be more firmly locked to the brush holding portion 2. It becomes possible to suppress idling of the brush holding part 2 more reliably.

[Third embodiment]
FIG. 9 is a diagram of a brush holding part 2B having a locking part 26B viewed in the central axis X direction in a nasal cavity cleaning tool 100B according to the third embodiment. As shown in FIG. 9, the nasal cavity cleaning tool 100B according to the third embodiment has a shaft portion 21B that They mainly differ in the number of locking portions 26B provided, but are common in other respects.

In the nasal cavity cleaning tool 100B, four locking portions 26B are provided on the outer peripheral surface 25a of the base portion 25. In other words, the brush holding part 2B has four locking parts 26B. Note that the brush holding portion 2B may have a number of locking portions 26B other than four (or six).

[Fourth embodiment]
FIG. 10 is a view of a brush holding part 2C having a locking part 26C viewed in the central axis X direction in a nasal cavity cleaning tool 100C according to the fourth embodiment. As shown in FIG. 10, the nasal cavity cleaning tool 100C according to the fourth embodiment has a locking part 26C compared to the nasal cavity cleaning implement 100 according to the first embodiment or the nasal cavity cleaning implement 100A according to the second embodiment. They differ mainly in the direction in which the top faces, but are common in other respects.

In the nasal cavity cleaning tool 100C, the locking portion 26C is such that when viewed in at least one direction perpendicular to the central axis X in a cross section perpendicular to the central axis X of the brush holding portion 2C, the top of the locking portion 26C is It is not formed so as to be located between two boundary parts between the stop part 26C and the base part 25. In addition, in FIG. 10, the locking portions 26C are provided at positions symmetrical with respect to the central axis X.

[Fifth embodiment]
FIG. 11 is a diagram showing a state in which the locking portion 26D is locked to the inner peripheral surface 31bD of the brush piece 30D in the nasal cavity cleaning tool 100D according to the fifth embodiment. As shown in FIG. 11, the nasal cavity cleaner 100D according to the fifth embodiment has a different shape of the annular part 31D of the brush piece 30D and the shape of the brush holding part 2D compared to the nasal cavity cleaner 100 according to the first embodiment. They differ in the shape of the shaft portion 21D, but are common in other respects.

In the nasal cavity cleaner 100D, the annular portion 31D is formed into a polygonal annular shape in which at least the inner circumferential surface 31bD has a polygonal shape. Here, the term "polygonal ring" refers to a ring whose inner periphery is polygonal, and the outer periphery may be polygonal or circular. Specifically, the inner peripheral surface 31bD of the annular portion 31D has a rectangular shape. Further, in the nasal cavity cleaner 100D, the shaft portion 21D of the brush holding portion 2D is formed in a polygonal column shape that fits into the annular portion 31D. Specifically, the shaft portion 21D of the brush holding portion 2D has a quadrangular column shape. The shaft portion 21D of the brush holding portion 2D loosely fits into the annular portion 31D. That is, the shaft portion 21D of the brush holding portion 2D is formed to have a smaller cross section than the annular portion 31D. The size of the gap when the shaft portion 21D and the annular portion 31D of the brush holding portion 2D are arranged coaxially (that is, when they are arranged so that the surrounding gaps are equal) is, for example, 0.01 mm or more. It may be 3 mm or less, 0.05 mm or more and 0.2 mm or less, or 0.08 mm or more and 0.1 mm or less. The smaller the gap is, the smaller the backlash will be, and the more water and the like will be prevented from entering the gap. On the other hand, the larger the gap, the easier it is to manufacture.

The shaft portion 21D includes a base portion 25D and a locking portion 26D. The base portion 25D corresponds to a central cylindrical portion of the shaft portion 21D. On the other hand, the locking portions 26D correspond to four corner portions of a cross section (here, a rectangular shape) perpendicular to the central axis X of the brush holding portion 2D. That is, when viewed in the direction of the central axis X, the brush holding portion 2D has a polygonal shape (here, a quadrangular shape), and the corner portions of the brush holding portion 2D are considered to be the locking portions 26D.

In this way, in the nasal cavity cleaning tool 100D, the annular part 31D has at least the inner circumferential surface 31bD formed in a polygonal column shape (here, a quadrangular column shape), and the locking part 26D is arranged along the central axis X of the brush holding part 2D. This is the corner of a vertical cross section. According to this, since the shapes of the locking portion 26D and the inner circumferential surface 31bD of the annular portion 31D correspond, it becomes possible to more reliably suppress idling of the brush holding portion 2D with respect to the brush piece 30D.

In the nasal cavity cleaner 100D, the brush holding portion 2D is loosely fitted into the annular portion 31D. According to this, it becomes easy to insert the brush holding part 2D into the annular part 31D.

[Sixth embodiment]
FIG. 12 is a diagram showing a state in which the locking portion 26E is locked to the inner peripheral surface 31bE of the brush piece 30E in the nasal cavity cleaning tool 100E according to the sixth embodiment. As shown in FIG. 12, the nasal cavity cleaning tool 100E according to the sixth embodiment has a locking part provided on the shaft part 21E of the brush holding part 2E, compared to the nasal cavity cleaning implement 100D according to the fifth embodiment. 26E and the shape of the inner circumferential surface 31bE of the annular portion 31E corresponding to the locking portion 26E, and are the same in other respects.

In the nasal cavity cleaner 100E, the annular portion 31E is formed into a polygonal annular shape in which at least the inner circumferential surface 31bE has a polygonal shape. Specifically, the inner peripheral surface 31bE of the annular portion 31E has a hexagonal shape. Further, in the nasal cavity cleaning tool 100E, the shaft portion 21E of the brush holding portion 2E is formed into a polygonal column shape that fits into the annular portion 31E. Specifically, the shaft portion 21E of the brush holding portion 2E has a hexagonal column shape. The shaft portion 21E of the brush holding portion 2E loosely fits into the annular portion 31E.

Here, the shaft portion 21E includes a base portion 25E and a locking portion 26E. The base portion 25E corresponds to a cylindrical portion at the center of the shaft portion 21E. On the other hand, the locking portions 26E correspond to six corner portions of a cross section (here, hexagonal shape) perpendicular to the central axis X of the brush holding portion 2E. That is, when viewed in the direction of the central axis X, the brush holding part 2E has a polygonal shape (here, a hexagonal shape), and the corner portions of the brush holding part 2E are considered to be the locking parts 26E.

[Deformed form]
Each of the embodiments described above can be implemented in various forms that are modified or improved based on the knowledge of those skilled in the art.

For example, in each of the embodiments described above, a structure included in one of the nasal cavity cleaning tools 100 to 100E may be partially combined with a structure included in another nasal cavity cleaning device 100 to 100E.

Further, in each of the embodiments described above, it is assumed that the nasal cavity cleaning tools 100 to 100E are used in the nasal cavity of a human. However, the nasal cavity cleaners 100 to 100E may be used in the nasal cavities of animals other than humans. In this case, the size of the brush portion 3 (for example, the length of the brush portion 3 in the central axis X direction, the outer diameter of the brush portion 3, the length of the brush bristles 32, etc.) must be optimized for the nasal cavity of the animal. is preferred.

Further, in each of the above-described embodiments, in the nasal cavity cleaners 100 to 100E, the diameter-reduced portion 3b has an outer shape that contracts toward the distal end side of the nasal cavity cleaner 100 along the central axis X direction. It has a truncated conical shape. However, the reduced diameter portion 3b may have a dome shape in which the inclined portion is a curved surface.

Further, in each of the above-described embodiments, the pressure lid portion 22 in the nasal cavity cleaning tools 100 to 100E is formed by ultrasonic welding. However, the pressure lid portion 22 may be formed by means other than ultrasonic welding.

Furthermore, in each of the embodiments described above, it is assumed that the nasal cavity cleaning tools 100 to 100E are used for cleaning the nasal cavity. However, the nasal cavity cleaning tools 100 to 100E may be used not only for cleaning the nasal cavity but also for cleaning teeth and the like. In this case, the nasal cavity cleaning tools 100 to 100E may be formally called an oral cavity cleaning tool, an oral brush, a toothbrush, or the like, or simply a cleaning tool, a brush, or the like.

100 Nasal cavity cleaning tool 1 Grip part 2 Brush holding part 3 Brush part 10 Main body part 20 Base end block part 20a Wall part 21 Shaft part 22 Pressure lid part 25 Base part 26 Locking part 26a Top part 26b Boundary part 30 Brush piece 31 Annular Portion 31a Outer circumferential surface 31b Inner circumferential surface 31c Side surface 31d Convex portion 32 Brush D Reference direction X Center axis

Claims (9)

An oral cavity cleaning tool inserted into the oral cavity to clean the oral cavity,
a grip part to be gripped by a user;
a shaft-shaped brush holding part extending from the gripping part;
a plurality of brush pieces stacked on top of each other and held by the brush holding section;
Each of the plurality of brush pieces is
an annular portion formed in an annular shape;
a plurality of brush bristles provided on the outer peripheral surface of the annular portion;
The brush holding part is inserted into the annular part so that the brush holding part is held by the brush holding part,
The brush holding part is
a cylindrical base portion;
A rib is formed on the outer circumferential surface of the base portion, extending along the central axis of the brush holding portion, and having an outer diameter from the central axis to the top of the brush holding portion larger than the inner diameter of the annular portion; a locking part that suppresses rotation of the brush piece about the central axis by being locked to an inner circumferential surface of the annular part of the brush piece being held;
By being inserted into the annular part by press fitting, the locking part is locked to the inner circumferential surface of the annular part,
An oral cavity cleaning tool, wherein the locking part is crushed by an inner circumferential surface of the annular part when the tool is inserted into the annular part. The oral cavity cleaning tool according to claim 1, wherein the plurality of brush bristles are provided radially outward from the outer circumferential surface of the annular portion over the entire circumference of the outer circumferential surface of the annular portion. In a cross section perpendicular to the central axis of the brush holding part, the locking part is configured such that, when viewed in at least one direction perpendicular to the central axis, the top of the locking part is connected to the locking part and the base part. The oral cavity cleaning tool according to claim 1, wherein the oral cavity cleaning tool is located between two boundary parts. The oral cavity according to claim 1, wherein each of the plurality of brush pieces has an inner circumferential surface of the annular portion pushed apart by the locking portion when the brush holding portion is inserted into the annular portion. Cleaning tools. The oral cavity according to any one of claims 1 to 4, wherein each of the plurality of brush pieces has side surfaces of the annular portions in contact with other adjacent brush pieces in a stacked state. Cleaning tools. The oral cavity cleaning tool according to claim 5, wherein each of the plurality of brush pieces has a convex portion formed on the side surface of the annular portion. The brush holding part is
a wall portion on the side of the gripping portion that the annular portion of the brush piece that is first inserted into the brush holding portion comes into contact with;
Finally, the pressurizing lid part presses and holds the annular part of the brush piece inserted into the brush holding part along the central axis toward the gripping part. Oral cleaning tool according to item (1). The oral cavity cleaning tool according to claim 7, wherein the pressure lid part is formed by ultrasonic welding. The plurality of brush pieces are formed such that the length of the brush bristles decreases from the gripping portion side toward the opposite side from the gripping portion, at least at an end portion opposite to the gripping portion. , the oral cavity cleaning tool according to any one of claims 1 to 8.

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