Interdental brush having an insertion guidance tip

Abstract

A method of providing an insertion guidance tip at a distal end of an interdental brush, use of a first set of filaments and a second set of filaments in an interdental brush, and an interdental brush comprising a first set of filaments arranged along a first longitudinal sub-length and having a first filament diameter, and a second set of filaments arranged along a second longitudinal sub-length and having a second filament diameter, wherein the second filament diameter is smaller than the first filament diameter, wherein the second longitudinal sub-length is positioned at the distal end of the interdental brush, and wherein the second sub-length has a length along the longitudinal direction being less than 15% of a longitudinal extension of the brush portion and extending along less than three twists of a core member.

1 . (canceled) 
     
     
         2 . An interdental brush with a brush portion having a longitudinal extension, comprising:
 a core member folded into two strands extending alongside each other along a longitudinal direction and being twisted about an axis extending along the longitudinal direction;   a plurality of filaments fastened between the two strands and extending radially from the twisted core member, and arranged side by side along a helix extending along the longitudinal direction thereby forming the brush portion;   wherein a first set of filaments is arranged along a first longitudinal sub-length of the twisted core member, the filaments of the first set of filaments having a first filament diameter;   wherein a second set of filaments is arranged along a second longitudinal sub-length of the twisted core member, the filaments of the second set of filaments having a second filament diameter;   wherein the second filament diameter is smaller than the first filament diameter;   wherein the second longitudinal sub-length is positioned at a distal end of the interdental brush;   wherein the second longitudinal sub-length of the brush portion is smaller than the first longitudinal sub-length of the brush portion, thereby providing an insertion guidance tip at the distal end of the interdental brush;   wherein the brush portion of the interdental brush has a conical shape at the distal end.   
     
     
         3 . The interdental brush of  claim 2 , wherein the second filament diameter constitutes 60-95% of the first filament diameter. 
     
     
         4 . The interdental brush of  claim 2 , wherein the second filament diameter constitutes 66-90% of the first filament diameter. 
     
     
         5 . The interdental brush of  claim 2 , wherein the filaments of the first set of filaments and the second set of filaments are formed from the same material. 
     
     
         6 . The interdental brush of  claim 2 , wherein the filaments of the first set of filaments and the second set of filaments are formed from different materials with different stiffness, such that the filaments with the second filament diameter have a reduced bending resistance compared to the filaments with the first filament diameter. 
     
     
         7 . The interdental brush of  claim 2 , wherein the second longitudinal sub-length of the brush portion has a length extending along less than three twists of the core member. 
     
     
         8 . The interdental brush of  claim 2 , wherein the second longitudinal sub-length of the brush portion has a length extending along less than two twists of the core member. 
     
     
         9 . The interdental brush of  claim 2 , wherein shorter filaments of the second set of filaments at the distal end of the interdental brush have a lower bending resistance than longer filaments of the first set of filaments. 
     
     
         10 . The interdental brush of  claim 2 , wherein the filaments of the second set of filaments have a length that constitutes 75-95% of the length of the filaments of the first set of filaments.