Cleaning portion for oral hygiene device and oral hygiene device

Abstract

A cleaning portion for a powered oral hygiene device comprises: a carrier mounted for driven rotation and / or oscillating rotation about an axis of rotation; at least a plurality of first cleaning elements and a plurality of second cleaning elements; the cleaning elements are mounted on a mounting surface of the carrier. The carrier includes an outer edge and an inner portion. The plurality of first cleaning elements are arranged at the inner portion of the carrier and the plurality of second cleaning elements are arranged at the outer edge of the carrier. The plurality of first cleaning elements has a longitudinal axis and a substantially cross-shaped cross-sectional area extending in a plane substantially perpendicular to the longitudinal axis, the cross-shaped cross-sectional area having four protrusions and four channels, the protrusions and the channels being arranged in an alternating manner.

Description

Technical Field

[0001] The present invention relates to a cleaning part for an electric oral hygiene device, the cleaning part comprising: a carrier, the carrier being mounted for driven rotation and / or oscillating rotation around a rotation axis; at least a plurality of first cleaning elements and a plurality of second cleaning elements; the cleaning elements being mounted on a mounting surface of the carrier. The present invention also relates to an electric oral hygiene device, the electric oral hygiene device comprising such a cleaning part and a handle, the cleaning part being repeatedly attachable to and detachable from the handle. Background Art

[0002] Tufts of multiple filaments for oral care tools such as manual and electric toothbrushes are well known in the art. Generally, the tuft is attached to a bristle carrier of a head intended for insertion into the oral cavity of a user. A gripper is typically attached to the head, which is held by the user during brushing. The head is either permanently connected to the handle or can be repeatedly attached to and detached from the handle.

[0003] In order to effectively clean teeth, it is necessary to provide appropriate contact pressure between the free end of the filament and the teeth. Generally speaking, the contact pressure depends on the bending rigidity and displacement of the filament, while the bending rigidity of a single filament depends on its length and cross-sectional area. Generally, compared with shorter filaments, filaments with a longer length exhibit lower bending rigidity. However, relatively thin filaments tend to be easily flexed and relatively low bending rigidity leads to reduced plaque removal efficacy on the tooth surface, as well as less inter-tooth penetration characteristics and cleaning performance. In order to compensate for the described reduction in the bending rigidity of longer filaments, the cross-sectional area size of the filament can be increased. However, relatively thick filaments can produce an unpleasant brushing sensation, and tend to hurt the gums in the oral cavity, especially when using an electric toothbrush. In addition, thicker filaments can show reduced bending recovery, and using the filaments can form an impression that the cluster pattern is worn after a relatively short use time.

[0004] In addition, filaments having a profile extending along their length, thereby producing a non-circular cross-sectional area (e.g., a polygonal or cross-shaped cross-sectional area) are also known in the art. Such filaments should improve the cleaning properties of the oral care tool during normal use. Specifically, the profiled edge should provide a stronger scraping action during the brushing process to improve the removal of plaque and other residues on the tooth surface.

[0005] Although toothbrushes including conventional types of clusters fully clean the outer buccal surfaces of teeth, they are generally not well suited to provide sufficient removal of plaque and debris from interproximal areas and other difficult-to-reach oral regions, because penetration into the interdental space is still relatively difficult. Specifically, they are not well suited to fully clean the gingival margins where plaque usually begins to grow. Therefore, in order to achieve and maintain good oral health and prevent gingivitis, it is important to clean along the gum line, specifically along the gap (so-called gingival sulcus) between the teeth and the periodontal tissue. Known lack of good removal of plaque in the gingival sulcus can lead to gingivitis, that is, inflammation of the gingival tissue. In addition, standard clusters do not provide enough capillary effects to remove plaque and debris from the teeth and gum surfaces during brushing. However, in order to achieve good cleaning results, plaque must be reached by clusters / filaments, and then plaque must be destroyed and finally removed. In addition, clusters should provide good sensory sensations for gums during brushing, particularly in the case of using an electric / electrically driven toothbrush that performs rotation and / or oscillating motion.

[0006] In addition, the mechanical stresses occurring in the cross-shaped filaments during the brushing process lead to higher stresses in the tips of the cross-shaped filaments compared to round filaments. This means that in a cluster with the same overall stiffness, the cross-shaped filaments must withstand higher maximum stress values ​​than round filaments. This increased stress in the individual cross-shaped filaments can lead to increased wear behavior during use. This wear is characterized by an increased spread of the clusters leading to less consumer acceptance.

[0007] It is an object of the present disclosure to provide a cleaning portion for an electric oral hygiene device which overcomes at least one of the above mentioned drawbacks. It is another object of the present disclosure to provide an electric oral hygiene device comprising such a cleaning portion. Summary of the invention

[0008] According to one aspect, a cleaning part for an electric oral hygiene device is provided, the cleaning part comprising: a carrier mounted for driven rotation and / or oscillating rotation around a rotation axis; at least a plurality of first cleaning elements and a plurality of second cleaning elements; the cleaning elements are mounted on a mounting surface of the carrier, the carrier having an outer edge and an inner portion, the plurality of first cleaning elements being arranged at the inner portion of the carrier, and the plurality of second cleaning elements being arranged at the outer edge of the carrier, the plurality of first cleaning elements each having a longitudinal axis and a substantially cross-shaped cross-sectional area extending in a plane substantially perpendicular to the longitudinal axis, the cross-shaped cross-sectional area having four protrusions and four channels, the protrusions and the channels being arranged in an alternating manner.

[0009] According to one aspect, there is provided an electric oral hygiene device comprising such a cleaning portion and a handle to which the cleaning portion is repeatedly attachable and detachable. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention is described in more detail below with reference to various embodiments and the accompanying drawings, in which:

[0011] Figure 1 shows a schematic perspective view of a first example embodiment of an electric oral hygiene device including a handle and a cleaning portion according to the present disclosure;

[0012] Figure 2 Shows Figure 1 A schematic perspective view of a cleaning portion of

[0013] Figure 3 shows a schematic perspective view of a second exemplary embodiment of a cleaning portion for an electric oral hygiene device according to the present disclosure;

[0014] Figure 4 shows a schematic perspective view of a third exemplary embodiment of a cleaning portion for an electric oral hygiene device according to the present disclosure;

[0015] Figure 5 shows a schematic perspective view of a fourth example embodiment of a cleaning portion for an electric oral hygiene device according to the present disclosure;

[0016] Figure 6 shows a schematic perspective view of a fifth exemplary embodiment of a cleaning portion for an electric oral hygiene device according to the present disclosure; and

[0017] Figure 7 A schematic cross-sectional view of a first cleaning element is shown. DETAILED DESCRIPTION

[0018] The electric oral hygiene device (also referred to as an "oral care tool") according to the present invention may be an electrically driven toothbrush comprising a handle and a cleaning portion. Such a cleaning portion is also referred to as a "head". The cleaning portion extends from the handle and can be repeatedly attached to and detached from the handle.

[0019] The cleaning part comprises a carrier / bristle carrier which may have a substantially circular shape or an elliptical shape. The carrier comprises an outer edge and an inner part. Such a carrier may be provided for an electric toothbrush which may perform a rotational oscillating motion. The bristle carrier of the electric toothbrush may be driven so as to rotate in an oscillating manner around an axis of motion or to move axially along an axis of motion, wherein the axis of such motion may extend substantially perpendicular to a plane defined by an upper top surface of the bristle carrier.

[0020] At least a plurality of first cleaning elements and a plurality of second cleaning elements are mounted on the mounting surface of the carrier. When the plurality of first cleaning elements are arranged / mounted at the inner part of the carrier, the plurality of second cleaning elements are arranged / mounted at the outer edge of the carrier, i.e. very close to the outer edge.

[0021] The plurality of first cleaning elements each have a longitudinal axis and a substantially cross-sectional area extending in a plane substantially perpendicular to the longitudinal axis. The longitudinal axis of the cleaning element is defined by a main extension of the cleaning element. The cross-sectional area of ​​the first cleaning element has four protrusions and four channels, which are arranged in an alternating manner.

[0022] The first cleaning element can be an elastomeric element or a filament. Such filaments can be made of thermoplastic polymers, for example, made of polybutylene terephthalate (PBT). A plurality of such first cleaning elements / filaments can be bundled together to form a filament cluster mounted on a carrier. The cluster of such first cleaning elements / filaments can be referred to as a "cluster of the first type". Optionally, such a cluster of the first type can include not only the first cleaning element, but also a mixture of the first cleaning element and many other types of cleaning elements / filaments. For example, many first cleaning elements / filaments and many circular and / or trilobal filaments can be bundled together to form a cluster of the first type.

[0023] The second cleaning element arranged at the outer edge of the carrier has a longitudinal axis and a substantially cross-sectional area extending in a plane substantially perpendicular to the longitudinal axis. The cross-sectional area of ​​the second cleaning element is different from the cross-sectional area of ​​the first cleaning element. For example, the cross-sectional area of ​​the second cleaning element may be substantially circular, trilobal or may have a shape comprising a plurality of depressions. Such second cleaning elements may be elastomeric elements or may be bundled together to form filaments of filament clusters. Such clusters of second cleaning elements / filaments may be referred to as "clusters of the second type".

[0024] Such an arrangement of the first cleaning element and the second cleaning element provides an excellent brushing / cleaning effect. The first cleaning element arranged at the inner portion of the carrier can provide a deep cleaning effect due to the scraping action performed by the protrusions on the teeth to remove plaque and other residues on the tooth surface, while the second cleaning element arranged at the outer edge can provide a gentler cleaning action along the more sensitive gum line. In addition, the protrusions of the first cleaning element can more easily penetrate into the interdental area and hard-to-reach areas during the rotational oscillating motion of the head, which can provide further improved cleaning properties of the head. Plaque and other residues can be loosened by the oscillating action of the first cleaning element, while the rotational motion can sweep away plaque and additional residues.

[0025] Since the first cleaning element is arranged at the inner part of the carrier, they rotate and move less during the brushing action than the second cleaning element arranged at the outer edge. The benefit of doing this is that the first cleaning element is less flexed and bent during use. Therefore, (compared with round filaments,) the mechanical stress that causes higher stress in the tip of the cross filament that occurs in the cross filament during the brushing process is reduced. The wear of the cross filament during use can be significantly reduced. The typical feature of this type of wear is that the expansion of the cluster that causes less consumer acceptance increases. In addition, thinner cleaning elements can be applied, which produce a more pleasant brushing feeling / experience. If such filaments are arranged at the inner part of the carrier, such elements form a less worn impression. For example, the first cleaning element can each have a cross-sectional area with an outer diameter, and the outer diameter of at least some of the first cleaning elements in the first cleaning element can be about 0.1mm to about 0.3mm, or about 0.256mm. Surprisingly, it has been found that cross-shaped filaments having a diameter of about 0.256 mm improve the brushing feel compared to cross-shaped filaments having a larger diameter.

[0026] In the context of the present disclosure, the outer diameter of the first cleaning element is defined by the length of a straight line passing through the center of the element cross-sectional area, and its endpoints are located on the outermost circumference of the cross-sectional area. In other words, the cross-shaped cross-sectional area has an imaginary outer circumference in the form of a circle (i.e., an outer envelope circle), and the outer diameter is defined as the longest straight line segment of a circle passing through the center of the circle.

[0027] The cruciform filaments of the first type of clusters may be provided with a relatively low packing factor (in the range of about 45% to about 57%, or in the range of about 45% to about 55%, or in the range of about 48% to about 50%). In the context of the present disclosure, the term "packing factor" is defined as the sum of the cross-sectional areas of the filaments in the cluster hole divided by the cross-sectional area of ​​the cluster hole. In embodiments where anchors (such as nails) are used to mount the clusters in the cluster holes, the area of ​​the anchoring device is excluded from the cross-sectional area of ​​the cluster hole.

[0028] The filling factor of about 45% to about 57%, or about 45% to about 55%, or about 48% to about 50% can show the specific void volume in the cluster, but the cross-shaped filaments are still in contact with each other along a part of the outer surface. The void volume can deliver more toothpaste to the brushing process, and the toothpaste can interact with the teeth for a longer time period, which helps to improve the brushing effect. In addition, the void volume (i.e., the space between the filaments) obtains increased absorption of loose dental plaque due to improved capillary action. In other words, such low filling factors can cause more dentifrice / toothpaste to remain at the filament / adhere to the filament for a longer time period during the brushing process. In addition, lower cluster density can avoid dentifrice diffusion, which can lead to improved overall brushing process. Toothpaste can be better accommodated in the channel, and contact with the teeth when cleaning, directly delivered, thereby achieving a greater polishing effect, which is desirable, specifically for removing tooth discoloration.

[0029] In other words, a relatively low fill factor in the range of about 45% to about 57%, or about 45% to about 55%, or about 48% to about 50% can provide improved brushing efficacy, i.e., better removal of plaque and debris from the surfaces of the teeth and gums due to improved capillary effects. These capillary effects can enable the dentifrice to flow toward the tips / free ends of the filaments, and thus, can enable more dentifrice to be applied to the teeth and gums during brushing. At the same time, the absorption of plaque and debris from the surfaces of the teeth and gums is improved.

[0030] In addition, due to the cross-shaped geometry of the filament, when prepared by the same amount of material, each single filament is harder than the circular filament. However, due to the low filling factor in the range of about 45% to about 57%, or about 45% to about 55%, or about 48% to about 50%, the rigidity of the overall cluster made of the cross-shaped filament is reduced compared with the cluster of the circular filament. Surprisingly, it has been found that this type of cluster provides an improved sensory experience, i.e., a softer feeling in the oral cavity during brushing, while providing an increased cleaning effect. The projection of the cross-shaped filament can easily enter the gingival sulcus and other difficult-to-reach areas, for example, the interproximal tooth surface, scraping on the surface to relax dental plaque, and due to the improved capillary effect of the whole cluster, dental plaque can be better removed. Due to the specific shape, the cross-shaped filament can penetrate deeper into the gingival sulcus and the interproximal area. In addition, the relatively low filling factor of the cluster of the first type can make the independent cross-shaped filament better adapt to the profile of the gum line and the gingival sulcus.

[0031] Because at least one second type of tooth cleaning element is arranged at the outer edge of the carrier / head, i.e. at the outer edge of the bristle zone, the second cleaning element can provide the first type of clusters with increased stability so as to prevent the clusters from spreading widely. Thus, the second cleaning element can significantly improve the wear behavior and the wear appearance of the first type of clusters with a relatively low filling factor, and thus improve the lower stability while providing increased tooth cleaning efficacy. After brushing, in particular after a longer period of time, a toothbrush that appears to be less used provides a higher consumer acceptance.

[0032] The second cleaning element may be a filament gathered together to form at least one second type of cluster, and may have a higher bending stiffness / greater stability than the cluster comprising the first cleaning element. The second type of cluster may have a packing factor of about 70% to about 80%, thereby providing a higher bending stiffness and greater stability of the overall cluster compared to the first type of cluster. In the case where the second cleaning element is an elastomeric element, the second cleaning element may be made of a TPE material, and / or may have the shape of an elastomeric wall extending along the length extension of the head. Such an elastomeric wall may provide a polishing effect on the outer tooth surface, and may more completely remove tooth staining. Alternatively, the elastomeric element may have the shape of a rubber nub or finger for stimulating and massaging the gums.

[0033] At least some of the first cleaning elements may be at least partially arranged in a circle about the axis of rotation.

[0034] Additionally, at least some of the second cleaning elements may be arranged at least partially in a circle about the axis of rotation along an outer edge of the carrier.Such a carrier / head configuration may also enhance the effects and benefits as described above.

[0035] At least some of the first cleaning elements may be circumferentially inclined in the same circumferential direction relative to the axis of rotation to enhance inter-tooth penetration of the cleaning elements and thus enhance the brushing / cleaning effect. Additionally, at least some of the first cleaning elements may be arranged in the center of the carrier.

[0036] At least some of the first cleaning elements and at least some of the second cleaning elements are arranged in an alternating manner in the circumferential direction with respect to the rotation axis.

[0037] Each channel of the cross-shaped first cleaning element may have a concave bend formed by adjacent and converging protrusions. The concave bend may have a radius in the range of about 0.02 mm to about 0.09 mm, or about 0.03 mm to about 0.06 mm. In other words, two adjacent protrusions, that is, the lateral edges of two adjacent sides of the protrusions may converge at the bottom of the channel and define a "convergence region". Adjacent protrusions may converge in the convergence region in a concave bend (that is, with an inwardly curved radius) formed at the bottom of the channel. Compared with standard cross-shaped filaments, the radius in this range is relatively large.

[0038] It has been observed in the past that conventional cross-shaped filaments have the disadvantage that these types of filaments can easily get caught between each other during manufacturing and brushing. However, it has been surprisingly found that the specific geometry / profile of the outer surface of the first cleaning element according to the present disclosure allows for improved manufacturability, because when a plurality of said filaments are combined to form a cluster during the so-called "pick-up process", the likelihood of filament / cleaning element getting caught is significantly reduced.

[0039] In addition, due to the larger radius at the bottom of the channel, the filament / first cleaning element provides increased stability and therefore less filament damage occurs during the toothbrush manufacturing process, such as when the filament is picked up and fixed to the mounting surface of the brush head during the binding or hot tufting process. In the past, it has been observed that a relatively large number of conventional cross-shaped filaments are damaged during the picking process, specifically the protrusions can be detached from the filaments or the filaments are cut off in the converging area at the bottom of the channel. The cut filaments can provide relatively sharp edges, which can damage / injure oral tissue during brushing.

[0040] In addition, surprisingly, it has been found that due to the specific geometry of the radius of the concave bend, the filaments in the cluster can be better filled with a relatively low filling factor (i.e., in the range of about 45% to about 57%, or in the range of about 45% to about 55%, or in the range of about 48% to about 50%), because the gap between two adjacent filaments can be maximized. It has been found that it is important that the filaments show a specific gap area while still contacting each other. In order to produce a toothbrush that meets regulatory requirements and is understood by consumers about the overall appearance, a high filling factor (about 70% to about 80% for round filaments; about 80% for diamond filaments; about 89% for trilobal filaments) is usually required. With regard to toothbrushes manufactured by binding technology, a filling factor lower than about 70% causes insufficient compression of the filaments in the cluster hole, and therefore provides insufficient cluster retention. Therefore, regulatory requirements are not met in the case of round filaments provided with a filling factor lower than about 70%. For hot tufted toothbrushes, a filling factor below about 70% will allow the plastic melt to enter the tufts during the overmolding process because the pressure of the melt pushes the filaments of the tufts to one side until the filaments contact each other. So-called multi-spikes are thereby formed, which can damage / harm the gums and therefore result in an unsafe product. In addition to regulatory and safety aspects, low-filled tufts of round filaments will have a "wild-type" and destroyed appearance and will not be accepted by consumers. However, in the case of using cross-shaped filaments with a radius of the concave bend of the channel ranging from about 0.02 mm to about 0.09 mm, a low filling factor can be achieved for a compliant and safe product with an acceptable overall appearance while providing improved cleaning characteristics.

[0041] Each protrusion of the cross-sectional area includes two outer lateral edges along the longitudinal extension of the filament. These lateral edges can produce relatively high concentrated stresses on the tooth surface to disrupt and remove dental plaque. The outer edges can provide a scraping effect, so that dental plaque and other debris are loosened more effectively. Due to the relatively large radius of the concave bend at the bottom of the channel, the protrusion provides increased rigidity / stability to make it easier / effective to loosen / remove dental plaque from the tooth surface. The channel can then capture the disrupted dental plaque and remove it from the teeth.

[0042] Surprisingly, it has been found that such filament geometries provide even further improved cleaning performance while maintaining brushing comfort in the oral cavity. Furthermore, it has been found that such geometries even further help reduce the appearance of filament / tuft wear, as the filaments are even less likely to get caught during brushing. Additionally, the manufacturability of such filaments during the toothbrush manufacturing process is further improved.

[0043] Each protrusion of the cross-shaped cross-sectional area of ​​the first cleaning element has a distal end that can be rounded to form a bend with a specific radius. The radius of the bend of the protrusion can be about 0.01 mm to about 0.02 mm, or about 0.015 mm.

[0044] The ratio of the radius of curvature of the projection to the radius of curvature of the passage can be in the range of about 0.1 to about 1.0 or about 0.2 to about 0.5. Compared with the standard cross-shaped filament according to the prior art, the ratio is relatively low. In other words, the radius of the concave curvature of the passage is relatively large relative to the diameter of the curvature of the projection (i.e., relative to the width extension of the projection), or in other words, the diameter of the curvature of the projection can be relatively thin compared to the radius of the concave curvature of the passage. For example, each projection of the first cleaning element can have a maximum thickness, and the maximum thickness of each projection can be about 0.025mm to about 0.045mm, or about 0.037mm to about 0.041mm. The relatively large radius provides increased stability for relatively thin projections. Therefore, during the toothbrush manufacturing process, specifically when the filament is picked up, the possibility that the filament / projection is damaged or the relatively thin projection is disengaged is small. In other words, the manufacturability of such filaments during the toothbrush manufacturing process is further improved.

[0045] In addition, surprisingly, it has been found that such filament geometries provide even further improved cleaning performance while maintaining brushing comfort in the oral cavity. In addition, it has been found that such geometries also help reduce the appearance of filament / tuft wear, because the possibility of filaments being caught during brushing is even less.

[0046] The diameter of the bend of the protrusion may be in the range of about 5% to about 12% of the outer diameter of the filament.Surprisingly, it has been found that such filaments may conform to tooth contours even better and penetrate more easily into interdental spaces to more completely remove plaque and debris.

[0047] The projections of the cross-shaped first cleaning element may taper radially in an outward direction (i.e., in a direction away from the center of the cross-sectional area and toward the outer circumference). Such tapered projections may also ensure access to narrow spaces and other hard-to-reach areas, and may be able to penetrate / enter the interdental area even more deeply and effectively. Because the cross-shaped filaments / cleaning elements have a higher bending stiffness than round filaments made of the same amount of material, the higher bending stiffness may force the projections of the filaments to slide more easily into the interdental area.

[0048] The projections may taper radially outward at an angle in the range of about 6° to about 25° or at an angle in the range of about 8° to about 20°. Surprisingly, it has been found that such taper allows for optimal inter-tooth penetration characteristics. In addition, such filaments may be more easily bundled in a cluster without trapping the profile of adjacent filaments.

[0049] The first cleaning element / long filament can be a substantially cylindrical cleaning element / long filament, that is, the filament can have a substantially cylindrical outer lateral surface. In other words, the shape and size of the cross-sectional area of ​​the filament along its longitudinal axis can be substantially unchanged, that is, the shape and size of the cross-sectional area can be substantially constant on the longitudinal extension of the filament. In the context of the present disclosure, the term "outer lateral surface of the filament" refers to any outside or surface of the filament on its side. Compared with the tapered filament, this type of filament can provide increased bending stiffness. Higher bending stiffness can further help the filament to penetrate the interdental gap / space. In addition, cylindrical filaments are usually slowly worn, which can provide longer filament life.

[0050] The cylindrical filaments may have a substantially rounded tip / free end to provide gentle cleaning properties. The rounded tip can prevent the gums from being injured during brushing. In the context of the present disclosure, the rounded filaments still fall within the definition of substantially cylindrical filaments.

[0051] Alternatively, the first cleaning element / filament may include a substantially cylindrical portion and a tapered portion along its longitudinal axis, the tapered portion tapering longitudinally toward the free end of the filament, and the cylindrical portion has a cross-sectional area according to the present disclosure. In other words, the filament of the first type of cluster may be a tapered filament with a tip. The tapered filament can achieve optimal penetration into the zone between two teeth and into the gum pocket during brushing, and thus improved cleaning characteristics can be provided. The tapered filament may have an overall length extending above the mounting surface of the head in the range of about 8mm to about 16mm, optionally in the range of about 12.5mm, and a tapered portion in the range of about 5mm to about 10mm measured from the tip of the filament. The tip may be needle-shaped, may include a split end or a feathery end. The tapered portion may be produced by chemical and / or mechanical tapering processes.

[0052] The first cleaning element and / or the second cleaning element can be made of polyamide (e.g., nylon) with or without an abrasive such as kaolin clay, polybutylene terephthalate (PBT) with or without an abrasive such as kaolin clay, and / or a polyamide indicator material (e.g., nylon indicator material) colored at the outer surface. As the filament is used over time, the coloring on the polyamide indicator material can slowly fade to indicate the extent to which the filament is worn.

[0053] The first cleaning element and / or the second cleaning element may include at least two fragments of different materials. At least one fragment may include a thermoplastic elastomer material (TPE), and at least one fragment may include a polyamide (e.g., nylon) with or without an abrasive such as kaolin clay, polybutylene terephthalate (PBT) with or without an abrasive such as kaolin clay, or a polyamide indicator material (e.g., nylon indicator material) colored at the outer surface. These at least two fragments can be arranged in parallel structure or core-skin structure, which can cause the rigidity of the overall filament to decrease. There is an interior / chip segment comprising a harder material (e.g., polyamide or PBT), and there is a core-skin structure with an exterior / skin segment that surrounds the chip segment and comprises a softer material (e.g., TPE), a filament with a relatively soft outer lateral surface can be provided, which can cause gentle cleaning properties.

[0054] The first cleaning element and / or the second cleaning element may include a component selected from the following: fluoride, zinc, strontium salts, flavoring agents, silicon dioxide, pyrophosphate, hydrogen peroxide, potassium nitrate, or a combination thereof. For example, fluoride can provide a mineralizing effect and thus prevent tooth decay. Zinc can enhance the user's immune system. Hydrogen peroxide can bleach / whiten teeth. Silicon dioxide can have an abrasive effect to more effectively remove plaque and debris. Pyrophosphates can inhibit the formation of new plaque, tartar, and calculus along the gum line. Cleaning elements / filaments including pyrophosphates can provide lasting protection against inflammation of the gums and oral mucosa.

[0055] If multiple such cleaning elements are bundled together to form a cluster, they may be arranged in such a way that the filaments at the outer lateral surface of the cluster may contain pyrophosphate to inhibit the formation of plaque, tartar and calculus along the gum line, while the filaments arranged in the center of the cluster may contain fluoride to mineralize the teeth during the brushing process.

[0056] At least one of the components listed above can be applied to the skin, i.e., to the outer segments of the filaments. In other words, at least some of the first cleaning elements / filaments and / or second cleaning elements / filaments of the cluster can include a core-skin structure, wherein the interior / chip segment can include TPE, polyamide or PBT, and the exterior / skin segment can include at least one of the components listed above. Such a core-skin structure can make one or more components directly used for teeth with a relatively high concentration, that is, one or more components can be in direct contact with teeth during brushing.

[0057] Alternatively, at least one of the components listed above may be coextruded with TPE, polyamide (eg, nylon), and / or PBT. Such embodiments may allow for gradual application of one or more components to the teeth as the filament material slowly wears during use.

[0058] The head of the oral care tool according to the present disclosure may include a bristle carrier that may be provided with a tuft hole (e.g., a blind hole). The tuft according to the present disclosure may be fixed / anchored in the tuft hole by a binding process / anchoring tufting method. This means that the filaments of the tuft are bent / folded in a substantially U-shaped manner around an anchor, such as one made of metal, which is, for example, an anchor cable or an anchor plate. The filaments are pushed into the tuft hole together with the anchor so that the anchor penetrates into the opposite side walls of the tuft hole, thereby anchoring / fixing / fastening the filaments to the bristle carrier. The anchor may be fixed in the opposite side walls by positive friction engagement. In the case where the tuft hole is a blind hole, the anchor holds the filament against the bottom of the hole. In other words, the anchor may be located above the U-shaped bend in a substantially vertical manner. Since the filaments of the tuft are bent around the anchor in a substantially U-shaped configuration, the first branch and the second branch of each filament extend from the bristle carrier along the filament direction. The type of filament that can be used / applicable to the binding process is also referred to as "double-sided filament". The head for an oral care tool manufactured by the binding process can be provided in a relatively low cost and time-efficient manner. Due to the improved geometry of the filaments of at least one first type of cluster according to the present disclosure, fewer filaments are damaged (e.g., by cutting) when the filaments are picked up and fixed on the mounting surface of the brush head during the binding process. In addition, when multiple filaments are picked up to form a cluster, fewer filaments are trapped on the outer surface of adjacent filaments.

[0059] Alternatively, the cluster can be attached / fixed to the head using a hot tufting process. A method for manufacturing the head of an oral care tool may include the following steps: First, the cluster can be formed by providing a desired amount of filaments according to the present disclosure. Second, the cluster can be placed in a mold cavity so that the end of the filament that should be attached to the carrier extends into the cavity. Third, a carrier can be formed around the end of the filament extending into the mold cavity by an injection molding process, thereby anchoring the cluster in the carrier. Before starting the injection molding process, the end of at least one cluster extending into the mold cavity can be optionally melted or fusion-bonded to join the filaments together in a melt or sphere so that the melt or sphere is located in the cavity. The cluster can be kept in the mold cavity by a molding rod with a blind hole, which corresponds to the desired position of the cluster on the finished head of the oral care tool. In other words, the filaments of the clusters attached to the carrier using a hot tufting process may not be doubled on the middle part along their length, and may not be installed in the head by using anchors / pins. The cluster can be installed on the carrier by means of a tufting process without anchors. The hot tufting manufacturing process allows complex cluster geometries to be obtained. For example, the cluster may have a specific morphology / geometry at its free end (i.e., at its upper top surface), which may be shaped to best fit the contour of the teeth and further enhance interdental penetration. For example, the morphology may be chamfered or rounded in one or two directions, sharp, or may form a straight line, concave or convex surface. Due to the improved geometry of the filament / first cleaning element according to the present disclosure, when the filaments are picked up and fixed on the mounting surface of the brush head during the hot tufting process, fewer filaments are damaged (e.g., by cutting). In addition, when multiple filaments are picked up to form a cluster, fewer filaments are captured on the outer surface of adjacent filaments.

[0060] The following is a non-limiting discussion of exemplary embodiments of oral hygiene devices and components thereof according to the present disclosure, with reference to the accompanying drawings.

[0061] Figure 1 A schematic perspective view of an example embodiment of an electric oral hygiene device 10 is shown. In this example, the electric oral hygiene device 10 is an electric toothbrush including a handle 12 and a cleaning portion 14. The cleaning portion 14 includes a toothbrush head or bristle carrier 16 and a shaft 18 that can be repeatedly attached to and detached from the handle 12.

[0062] like Figure 2 As shown, the carrier 16 of the cleaning portion 14 is mounted on the head 20 for driven rotation and / or oscillating rotation about the rotation axis 22. Figures 2 to 6In the embodiment of the present invention, it can be concluded that at least a plurality of first cleaning elements 24 and a plurality of second cleaning elements 26 are mounted on the mounting surface 28 of the carrier 16. The carrier 16 includes an outer edge 30 and an inner portion 32. A plurality of first cleaning elements 24 are arranged at the inner portion 32 of the carrier 16, while a plurality of second cleaning elements 26 are arranged at the outer edge 30 of the carrier 16. The first cleaning elements 24 and / or the second cleaning elements 26 may be elastomeric cleaning elements or filaments bundled together in clusters. The first cleaning elements and / or the second cleaning elements may be made of a thermoplastic polymer, such as polybutylene terephthalate (PBT).

[0063] like Figure 7 As shown, the first cleaning element 24 has a longitudinal axis and a substantially cross-shaped cross-sectional area 34 extending in a plane substantially perpendicular to the longitudinal axis. The cross-sectional area 34 has four protrusions 36 and four channels 38, and the protrusions 36 and the channels 38 are arranged in an alternating manner. Similarly, the second cleaning elements 26 each have a longitudinal axis. However, for example, the cross-sectional area extending in a plane substantially perpendicular to the longitudinal axis can be circular.

[0064] The cross-sectional area 34 of the first cleaning elements 24 has an outer diameter 40, and at least some of the first cleaning elements may have an outer diameter of from about 0.1 mm to about 0.3 mm, or about 0.256 mm.

[0065] Each protrusion 36 of the first cleaning element 24 has a maximum thickness 42, and the maximum thickness 42 of each protrusion can be about 0.025 mm to about 0.045 mm, or about 0.037 mm to about 0.041 mm. In addition, each protrusion 36 of the first cleaning element 24 has a distal end 48. The distal end 48 can be rounded at the end, thereby forming a bend 50 with a radius 52 of about 0.01 mm to about 0.02 mm or about 0.015 mm.

[0066] Each channel 38 of the first cleaning element 24 has a concave curve 44 formed by adjacent and converging protrusions 36. The concave curve 44 can have a radius 46 in the range of about 0.02 mm to about 0.09 mm, or about 0.03 mm to about 0.06 mm.

[0067] With such geometry of first cleaning elements 24, a plurality of such first cleaning elements 24 can be bundled together to form clusters 54 of cleaning elements / filaments 24. Such clusters 54 can have a packing factor ranging from about 45% to about 57%, or from about 45% to about 55%, or from about 48% to about 50%.

[0068] like Figures 2 to 5As shown, at least some of the first cleaning elements 24 bundled together in the first type of clusters 54 may be at least partially arranged in a circle around the rotation axis 22. In addition, at least some of the first cleaning elements 24 bundled together in the first type of clusters 54 may be arranged at the center 58 of the carrier 16 (see Figure 5 and Figure 6 ).

[0069] In addition, if Figure 2 As illustrated, at least some of the first cleaning elements 24 bundled together in the first type of tuft 54 ​​may be circumferentially tilted in the same circumferential direction relative to the rotation axis 22 .

[0070] like Figures 2 to 6 As illustrated, at least some of the second cleaning elements 26 bundled together in the second type of tufts 56 may be arranged at least partially in a circle about the axis of rotation 22 along the outer edge 30 of the carrier 16 .

[0071] like Figure 2 As shown, the first type of tufts 54 and the second type of tufts 56 may also be arranged in an alternating manner in the circumferential direction relative to the rotation axis 22 .

[0072] In the context of this disclosure, the term "substantially" refers to an arrangement of elements or features that, while theoretically expected to exhibit exact uniformity or behavior, may in practice render something somewhat less precise. Likewise, the term represents the degree to which a quantitative value, measurement, or other related representation may vary from a stated reference without resulting in a change in the basic function of the subject matter at issue.

[0073] The dimensions and values ​​disclosed herein should not be understood as being strictly limited to the exact numerical values ​​cited. Instead, unless otherwise indicated, each such dimension is intended to represent the stated value and a functionally equivalent range around that value. For example, a dimension disclosed as "40 mm" is intended to mean "about 40 mm".

Claims

1. A cleaning portion (14) for an electric oral hygiene device (10), the cleaning portion (14) comprising: a carrier (16) mounted for driven rotation and / or oscillating rotation about an axis of rotation (22); and at least a plurality of first cleaning elements (24) and a plurality of second cleaning elements (26), the cleaning elements (24, 26) being mounted on a mounting surface (28) of the carrier (16), the carrier (16) having an outer edge (30) and an inner portion (32), The plurality of first cleaning elements (24) are arranged at the inner portion (32) of the carrier (16), and the plurality of second cleaning elements (26) are arranged at the outer edge (30) of the carrier (16), the plurality of first cleaning elements (24) each having a longitudinal axis and a substantially cross-shaped cross-sectional area (34) extending in a plane substantially perpendicular to the longitudinal axis, the cross-shaped cross-sectional area (34) having four protrusions (36) and four channels (38), the protrusions (36) and the channels (38) being arranged in an alternating manner.

2. A cleaning portion (14) according to claim 1, wherein the second cleaning elements (26) each have a longitudinal axis and a cross-sectional area extending in a plane substantially perpendicular to the longitudinal axis, the cross-sectional area being different from the cross-sectional area of ​​the first cleaning element, preferably being substantially circular, trilobal or comprising a shape having a plurality of depressions.

3. The cleaning portion (14) according to claim 1 or 2, wherein the first cleaning elements (24) and / or the second cleaning elements (26) are elastomeric cleaning elements or filaments arranged in tufts (54, 56).

4. The cleaning portion (14) according to any one of the preceding claims, wherein the first cleaning elements (24) are filaments arranged in clusters (54), the clusters having a filling factor in the range of about 45% to about 57%, preferably about 45% to about 55%, further preferably about 48% to about 50%.

5. The cleaning section (14) according to any one of the preceding claims, wherein at least some of the first cleaning elements (24) are at least partially arranged in a circle around the rotation axis (22).

6. The cleaning section (14) according to any one of the preceding claims, wherein at least some of the first cleaning elements (24) are circumferentially inclined in the same circumferential direction relative to the rotation axis (22).

7. The cleaning section (14) according to any of the preceding claims, wherein at least some of the second cleaning elements (26) are arranged in a circle around the rotation axis (22) at least partially along the outer edge (30) of the carrier (14).

8. The cleaning section (14) according to any one of the preceding claims, wherein at least some of the first cleaning elements (24) are arranged in the center (58) of the carrier (16).

9. The cleaning portion (14) according to any one of the preceding claims, wherein at least some of the first cleaning elements (24) and at least some of the second cleaning elements (26) are arranged in an alternating manner in a circumferential direction relative to the rotation axis (22).

10. The cleaning portion (14) according to any of the preceding claims, wherein the first cleaning elements (24) each have a cross-sectional area (34) with an outer diameter (40), and the outer diameter (40) of at least some of the first cleaning elements (24) is about 0.1 mm to about 0.3 mm, preferably about 0.256 mm.

11. The cleaning portion (14) according to any one of the preceding claims, wherein each protrusion (36) of the first cleaning element (24) has a maximum thickness (42), and the maximum thickness (42) of each protrusion (36) is about 0.025 mm to about 0.045 mm, preferably about 0.037 mm to about 0.041 mm.

12. The cleaning portion (14) according to any one of the preceding claims, wherein each channel (38) of the first cleaning element (24) has a concave curvature (44) formed by adjacent and converging protrusions (36), the concave curvature (44) having a radius (46), and the radius (46) of the concave curvature (44) of the channel (38) is in the range of about 0.02 mm to about 0.09 mm, preferably in the range of about 0.03 mm to about 0.06 mm.

13. A cleaning portion (14) according to any one of the preceding claims, wherein each protrusion (36) of at least some of the first cleaning elements (24) has a distal end (48) that is rounded at the end, thereby forming a bend (50) with a radius (52) of about 0.01 mm to about 0.02 mm, preferably about 0.015 mm.

14. The cleaning section (14) according to any of the preceding claims, wherein at least some of the first cleaning elements (24) are made of a thermoplastic polymer, preferably polybutylene terephthalate (PBT).

15. An electric oral hygiene device (10) comprising a handle (12) and a cleaning part (14) according to any one of the preceding claims, the cleaning part (14) being repeatedly attachable to and detachable from the handle (12).

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