EP4346504A1 - Brosse interdentaire ayant une section transversale de fil ovale et son procédé de production - Google Patents

Brosse interdentaire ayant une section transversale de fil ovale et son procédé de production

Info

Publication number
EP4346504A1
EP4346504A1 EP22731645.2A EP22731645A EP4346504A1 EP 4346504 A1 EP4346504 A1 EP 4346504A1 EP 22731645 A EP22731645 A EP 22731645A EP 4346504 A1 EP4346504 A1 EP 4346504A1
Authority
EP
European Patent Office
Prior art keywords
brush
section
length
interdental
interdental brush
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22731645.2A
Other languages
German (de)
English (en)
Inventor
Marco ZAVALLONI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CURADEN AG
Original Assignee
CURADEN AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CURADEN AG filed Critical CURADEN AG
Publication of EP4346504A1 publication Critical patent/EP4346504A1/fr
Pending legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B3/00—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier
    • A46B3/18—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier the bristles being fixed on or between belts or wires
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B9/00—Arrangements of the bristles in the brush body
    • A46B9/02—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups
    • A46B9/021—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups arranged like in cosmetics brushes, e.g. mascara, nail polish, eye shadow
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B9/00—Arrangements of the bristles in the brush body
    • A46B9/02—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups
    • A46B9/04—Arranged like in or for toothbrushes
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D3/00—Preparing, i.e. Manufacturing brush bodies
    • A46D3/04—Machines for inserting or fixing bristles in bodies
    • A46D3/05—Machines for inserting or fixing bristles in bodies for fixing the bristles between wires, tapes, or the like
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/10—For human or animal care
    • A46B2200/1066—Toothbrush for cleaning the teeth or dentures
    • A46B2200/108—Inter-dental toothbrush, i.e. for cleaning interdental spaces specifically

Definitions

  • the present invention relates to an interdental brush with a brush part which comprises two legs of a wire section twisted together and brush filaments held clamped between the legs. Furthermore, the invention relates to a method for producing such an interdental brush. State of the art
  • Interdental brushes are known from the prior art. As a rule, they comprise a handle part or a part for fixing the interdental brush to a handle and the brush part attached to the handle part or part for fixing for cleaning interdental spaces. To produce interdental brushes, the brush filaments are held between the legs, running transversely to the legs of the wire section, and then twisted together with them to be clamped therebetween, whereby an outer contour of the brush part assumes a spiral-like shape.
  • DE 10 2018 101 085 A1 relates to a screwed-in brush with a bristle base made of wire sections twisted together, which have oval and/or elliptical cross-sections at least in the distal section of the bristle base.
  • a screwed-in brush is also proposed, the bristle carrier of which has a pull-out protection at a distance from its proximal end. With the help of this pull-out protection, the bristle holder can be securely attached to the handle of the screwed-in brush will.
  • a method for producing a twisted-in brush in which wire sections, at least one of which is profiled, ie has at least two regions with different cross sections, are twisted together to form the bristle carrier.
  • EP 1 470 765 B1 by the applicant relates to an interdental brush in which filaments or bristles are held between two wire sections twisted together, which are made of an austenitic steel, and a method for producing such brushes. These are characterized by good rigidity with a relatively small diameter of the wire section.
  • the object of the invention is to reduce the disadvantages that occur with interdental brushes known from the prior art.
  • an interdental brush with a brush part which comprises two legs of a wire section twisted together and brush filaments held clamped between the legs, in that the wire section consists of an austenitic steel which has a chromium content of 15 to 17% by weight, a manganese content of 12 to 16% by weight, a molybdenum content of 0 to 4% by weight and a has an oval cross section with an ovality 0 in a range between 0.4 and 0.9, the ovality O being measured as a ratio between a length of a minor transverse axis and a length of a major transverse axis of the cross section.
  • these objects are achieved in particular in that, to produce a brush part of the interdental brush, two legs of a wire section are twisted together and brush filaments held between the legs are clamped, with a wire section made of austenitic steel having a chromium content being used of 15 to 17% by weight, a manganese content of 12 to 16% by weight and a molybdenum content of 0 to 4% by weight, and wherein the wire section is formed with an oval cross section with an ovality O in a range between 0.4 to 0.9 , and wherein the ovality O is measured as a ratio between a length of a minor transverse axis and a length of a major transverse axis of the cross section.
  • the solution according to the invention has the advantage that the selected alloy provides a particularly tough and yet sufficiently stiff steel in which the reverse bending strength is particularly good.
  • the flexural fatigue strength is also improved by the selected ovality, particularly in the transition area between the brush part and the handle part, where the wire section is exposed to frequent flexural changes.
  • particularly durable dental brushes are provided, which allow frequent bending changes and can therefore be used flexibly over the long term.
  • the twisted legs have windings with a winding length, measured parallel to a brush longitudinal axis, which is less than 1.5 times the maximum outer diameter of the wire section.
  • One parallel to the longitudinal axis of the brush The measured length of an untwisted leg can exceed a length of the twisted leg measured parallel to the brush longitudinal axis by a factor of 1.6 to 2.4, preferably by a factor of 1.8 to 2.2, most preferably by a factor of 2. It is thus possible to provide particularly densely twisted brush parts. Dense twisting helps, on the one hand, to generally increase the density or quantity of brush filaments that can be clamped between the legs. On the other hand, the dense twisting by increasing spring forces helps to further improve the flexural strength and elasticity of the brush section.
  • a depth of the windings measured as the difference between the maximum outside diameter and a minimum inside diameter, is less than 0.05 to 0.2 times, preferably 0.075 to 0.15 times, most preferably 0.1 times the maximum outside diameter.
  • a particularly shallow depth of the turns helps to further increase the density and compactness of the brush part, which further improves its flexural strength and elasticity.
  • a particularly small depth of the windings results in a reduction of the surface and smoothing of the brush part, as a result of which deposits of dirt and bacteria can be reduced there.
  • the wire has an elliptical original cross section, the ratio of a length of a major axis of the ellipse to a length of a minor axis of the ellipse being between 1.4 and 1.6.
  • Such an elliptical cross-section of the wire alone helps to further improve the bending strength and elasticity of the brush part.
  • the elliptical cross-sectional shape of the wire can also reduce the depth of the windings of the brush part or a seam formed between its legs, which, in addition to increasing the bending strength and elasticity, also reduces the surface of the brush part and smooths it, which in turn helps further reduce deposits of dirt and bacteria.
  • the ratio of the length of the major axis of the ellipse to the length of the minor axis of the ellipse Ellipse is between 1.5 and 1.55.
  • the ratio of the length of the major axis of the ellipse to the length of the minor axis of the ellipse can be essentially 1.53.
  • the wire section is provided with a coating.
  • a coating thickness of the coating may be substantially half a thickness of the brush filaments.
  • the brush filaments can be embedded in the coating. The coating and embedding help to further smooth and reduce the surface of the brush part and to close any pores, capillaries and other openings between the twisted legs of the wire section or between the brush filaments. This reduces deposits of dirt and bacteria even further.
  • the number of brush filaments per turn is greater than 10.
  • the number of brush filaments per turn can be greater than 25.
  • a number of 40 to 60, for example about 50 brush filaments per turn can be regarded as highly advantageous.
  • a particularly high density of brush filaments can thus be achieved, which are arranged in a spiral shape along the brush part, lying as close as possible to one another and/or overlapping. This helps to further improve the cleaning effect and the comfort of use of an interdental brush according to the invention.
  • a useful length of the brush filaments measured transversely to the longitudinal axis of the brush between an outer contour of the twisted wire section and a free end of the brush filaments is between 4 and 5 times the maximum outer diameter.
  • the ratio of a volume of the interdental brush occupied by a contour of the brush filaments in its entirety far exceeds a volume occupied by the wire section. This helps to further improve the cleaning effect and the ease of use of an interdental brush according to the invention.
  • a ratio between the maximum outside diameter and/or a maximum wire diameter of the wire and a maximum filament diameter of the brush filaments is between 4 and 4.6. Such a ratio leads to an improved coordination between the elasticity and rigidity of the wire section on the one hand and the brush filaments on the other hand.
  • the comfort of use and longevity of an interdental brush according to the invention can be further increased.
  • a free end of the brush has a rounding and that a maximum rounding diameter of the rounding is greater than the maximum outside diameter.
  • the free end of the brush is spherical in shape, at least in sections. The rounding helps to avoid or at least reduce sharp edges and corners at the free end of the brush. Thus, the risk of injury is reduced and the comfort of use is further increased.
  • the austenitic steel has a nitrogen content of 0.5% by weight, a silicon content of 0.25% by weight, a carbon content of 0.11% by weight and a nickel content of less than 0.05% by weight.
  • Such an alloy also helps to provide a particularly tough and sufficiently stiff steel with particularly good reverse bending strength.
  • a very low nickel content of less than 0.05% by weight is helpful in providing interdental brushes according to the invention with the highest possible biocompatibility.
  • the solution according to the invention can be further improved in that the brush part is stretched along the longitudinal axis of the brush after twisting.
  • an aspect ratio between a stretched length and an unstretched length of the brush part can be greater than 1 to 1.2, preferably greater than 1.05 to 1.15, most preferably 1.1. In this way, the density, elasticity and flexural fatigue strength of the brush part can be further increased.
  • FIG. 1 shows a schematic perspective view of an interdental brush according to the invention
  • FIG. 2 shows a schematic side view of a brush part of the interdental brush shown in FIG. 1;
  • FIGS. 1 and 2 are schematic cross-sectional views of an untwisted wire portion of the interdental brush shown in FIGS. 1 and 2;
  • Fig. 4 is a schematic cross-sectional view of a brush filament of the interdental brush shown in Figs. 1 to 3;
  • Fig. 5 shows a schematic side view of a brush part of another
  • FIG. 6 is a schematic cross-sectional view of an untwisted wire portion of the interdental brush shown in FIG. 5;
  • Fig. 7 is a schematic cross-sectional view of a brush filament of the interdental brush shown in Figs. 5 and 6;
  • FIG. 8 shows a schematic side view of a detail of an interdental brush according to the invention
  • Fig. 9 shows a schematic cross-sectional view of the interdental brush shown in Fig. 8 along the section line A-A drawn in Fig. 8;
  • FIG. 10 shows a schematic cross-sectional view of twisted wire sections of an interdental brush according to the invention.
  • FIG. 11 shows a schematic perspective view of a device for measuring kink resistance forces of interdental brushes according to the invention.
  • FIG. 1 shows a schematic perspective view of an interdental brush 1 according to the invention with a brush part 2 and a handle part 3, which is accommodated in a handling device 3A.
  • the brush part 2 comprises a wire section 4 on which brush filaments 5 are held.
  • At least the brush part 2 and the grip part 3 extend essentially parallel to a brush longitudinal axis L of the interdental brush 1.
  • FIG. 2 shows a schematic side view of the brush part 2 of the interdental brush 1 shown in FIG.
  • the brush filaments 5 together form a kind of spiral winding around the wire section 4 .
  • An outer diameter DB of the brush part 2 measured transversely to the longitudinal axis of the brush is approximately 2.5 mm in the exemplary embodiment of the interdental brush 1 shown in FIG. 3 shows a schematic cross-sectional view of a wire section 4A, 4B of the interdental brush 1 shown in FIGS. 1 and 2 in an untwisted state U.
  • the untwisted wire section 4A, 4B of the interdental brush 1 has an elliptical cross-sectional shape.
  • a major semi-axis of the ellipse has a length LHg of approximately 0.26 mm, while a minor semi-axis of the ellipse has a length LHk of approximately 0.17 mm.
  • the brush filament 5 has a cross-section with a filament diameter DF of approximately 0.0635 mm.
  • FIG. 5 shows a schematic side view of a brush part 4 of a further embodiment of an interdental brush 1′ according to the invention.
  • the brush filaments 5 extend essentially perpendicularly to the longitudinal axis L of the brush, radially away from the wire section 4 .
  • the brush filaments 5 together form a type of coil or helix winding around the wire section 4 .
  • An outer diameter DB of the brush part 2 measured transversely to the longitudinal axis of the brush is approximately 2.2 mm in the exemplary embodiment of the interdental brush 1' shown in FIG.
  • FIG. 6 shows a schematic cross-sectional view of the wire section 4A, 4B of the interdental brush 1' shown in FIG. 5 in the untwisted state U.
  • the untwisted wire section 4A, 4B of the interdental brush 1' also has an elliptical cross-sectional shape.
  • a major semi-axis of the ellipse has a length LHg of approximately 0.23 mm, while a minor semi-axis of the ellipse has a length LHk of approximately 0.15 mm.
  • FIG. 7 shows a schematic cross-sectional view of a brush filament 5 of the interdental brush 1′ shown in FIGS. 5 and 6.
  • the brush filament 5 has a cross section with a filament diameter DF of approximately 0.0508 mm.
  • FIG. 8 shows a schematic side view of a detail of the interdental brush 1, 1' according to the invention.
  • the wire section 4 is in a twisted state V with its limbs 4A, 4B, in which the limbs 4A, 4B together with the brush filaments 5 clamped between them wind spirally around the longitudinal axis L of the brush.
  • a winding length S of the windings, measured essentially parallel to the brush longitudinal axis L, is less than 1.5 times a maximum outer diameter DD of the wire section 4 in the present exemplary embodiment.
  • the brush filaments 5 have a useful length LN, with which they extend radially away from the wire section 4 in the twisted state V, essentially perpendicularly to the longitudinal axis L of the brush, measured.
  • the useful length LN is advantageously between 3.8 and 16 times the maximum outer diameter DD of the wire section 4.
  • the useful length LN is preferably between 4 and 10 times the maximum wire diameter.
  • a free brush end 6 is provided with a rounding 7, which is formed, for example, by upsetting and/or other types of plastic deformation, preferably as cold deformation, so as not to damage the brush filaments, which usually consist of a plastic.
  • FIG. 9 shows a schematic cross-sectional view of the interdental brush 1, 1' shown in FIG. 8 along the section line A-A drawn in FIG. It is clear here that the rounding has a rounding diameter DA, measured perpendicularly to the longitudinal axis L of the brush, which exceeds the maximum outside diameter DD of the wire section 4 .
  • a seam 8 formed between the legs 4A, 4B in the twisted state V has a depth T measured perpendicularly to the longitudinal axis L of the brush, which results from a difference between the maximum wire diameter DD and a minimum diameter or inner diameter Di of the wire section 4 measured at the bottom of the seam 8 results.
  • Fig. 10 shows a schematic cross-sectional view of the legs 4A, 4B of the interdental brush 1, 1 'in the twisted state V. It is clear here that the legs 4A, 4B each have an oval cross-section with a major transverse axis Qg and a minor transverse axis Qg with a length have LQg or LQk. An ovality O of the cross section, measured as the ratio between the length LQk of the minor transverse axis Qk and the length LQg of the major transverse axis Qg, is preferably between 0.4 and 0.9.
  • 11 shows a schematic perspective view of a device 100 for measuring buckling resistance forces F w of the interdental brush 1, 1'.
  • the interdental brush 1, 1′ is fixed with its grip part 3A in a holder (not shown), which in turn can be moved relative to the device 100 in a direction running essentially parallel to the longitudinal axis L of the brush.
  • the device comprises a stamp 101, a receiving plate 102 and two clamping jaws 103A, 103B.
  • the punch 101 is fixed in the receiving plate 102 .
  • the receiving plate 102 is held clamped between the clamping jaws 103A, 103B.
  • the free end of the brush 6 rests on top of the plunger 101 .
  • a buckling force F K acting on the free brush end 6 and directed essentially parallel to the longitudinal axis L of the brush can be measured counteracts this when the interdental brush 1, 1' is moved in the direction of the device 100. If the buckling force F K exceeds the buckling resistance force F w , then the wire section 4 of the brush part 2 buckles.
  • the buckling resistance force F w can be used as an indicator for the flexural fatigue strength of the interdental brushes 1, 1' or their wire section 4.
  • Buckling strength F w and reverse bending strength should generally be proportional to each other. In other words, the higher the buckling resistance force Fw , the higher the reverse bending strength of the wire section 4.
  • interdental brushes 1, 1′ according to the invention made from wires with an original elliptical cross section apply significantly higher buckling resistance forces F w than interdental brushes made from wires with round cross sections according to the prior art.
  • interdental brushes 1, 1' according to the invention which are made from an elliptical wire whose cross section has a minor semi-axis with a length LHk of 0.15 mm and a major semi-axis with a length LHg of 0.25 mm, bring kink resistance forces F w of an average of 2.52 Newtons with a measured minimum value of 2.17 Newton, a measured maximum value of 2.69 Newton and a standard deviation of 0.19 Newton.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Brushes (AREA)

Abstract

La présente invention se rapporte à une brosse interdentaire (1, 1') ayant une partie brosse (2) qui comprend deux pieds torsadés ensemble (4A, 4B) d'une partie fil (4) et des filaments de brosse (5) maintenus serrés entre les pieds (4A, 4B), et à un procédé permettant de produire une telle brosse interdentaire (1, 1'). Afin d'améliorer en particulier la limite de fatigue en flexion de la partie fil (4), selon l'invention, une partie de fil (4) réalisée en acier austénitique est utilisée, qui présente une teneur en chrome de 15 à 17 % en poids, une teneur en manganèse de 12 à 16 % en poids et une teneur en molybdène de 0 à 4 % en poids et la partie fil (4) est formée ayant une section transversale ovale avec une ovalisation O dans une plage comprise entre 0,4 et 0,9, l'ovalisation O étant mesurée en tant que rapport entre une longueur (LQk)) d'un petit axe transversal (Qk) et une longueur d'un grand axe transversal (Qg) de la section transversale.
EP22731645.2A 2021-06-02 2022-06-02 Brosse interdentaire ayant une section transversale de fil ovale et son procédé de production Pending EP4346504A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP21177444 2021-06-02
PCT/EP2022/065109 WO2022253977A1 (fr) 2021-06-02 2022-06-02 Brosse interdentaire ayant une section transversale de fil ovale et son procédé de production

Publications (1)

Publication Number Publication Date
EP4346504A1 true EP4346504A1 (fr) 2024-04-10

Family

ID=76250232

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22731645.2A Pending EP4346504A1 (fr) 2021-06-02 2022-06-02 Brosse interdentaire ayant une section transversale de fil ovale et son procédé de production

Country Status (7)

Country Link
US (1) US20240245206A1 (fr)
EP (1) EP4346504A1 (fr)
JP (1) JP2024520133A (fr)
KR (1) KR20240023028A (fr)
BR (1) BR112023024919A2 (fr)
CA (1) CA3222206A1 (fr)
WO (1) WO2022253977A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5882584A (en) * 1996-04-09 1999-03-16 Sunstar, Inc. Interdental brush wire and interdental brush
JP3458627B2 (ja) * 1996-11-22 2003-10-20 サンスター株式会社 歯間ブラシ用ワイヤー及び歯間ブラシ
JP2003169717A (ja) * 2001-09-25 2003-06-17 Kanai Hiroaki 歯間ブラシ用ワイヤおよび歯間ブラシ
ES2275074T3 (es) 2003-04-22 2007-06-01 Curaden International Ag Cepillo interdental.
JP2005152176A (ja) * 2003-11-25 2005-06-16 Tokusen Kogyo Co Ltd 隙間ブラシ用ワイヤおよび隙間ブラシ
DE102016005332A1 (de) * 2016-04-30 2016-07-07 Solo-Med GmbH Interdentalbürste und Diagnoseverfahren mit dieser Interdentalbürste
DE102018101085A1 (de) 2017-02-22 2018-08-23 Zahoransky Ag Eingedrehte Bürste, Verfahren zur Herstellung einer eingedrehten Bürste sowie Vorrichtung zur Herstellung einer eingedrehten Bürste

Also Published As

Publication number Publication date
CA3222206A1 (fr) 2022-12-08
WO2022253977A1 (fr) 2022-12-08
US20240245206A1 (en) 2024-07-25
KR20240023028A (ko) 2024-02-20
BR112023024919A2 (pt) 2024-02-20
JP2024520133A (ja) 2024-05-21

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