End cut of endodontic brush

Abstract

In some embodiments, the distal end of the endodontic brush is uneven (e.g., not along a line perpendicular to the axis of the brush). Optionally, the uneven strands will contact the walls of the canal more evenly and / or will have an increased agitation effect compared to a uniformly cut end that can be cut with an abrasive cutter (e.g., a grinding wheel) and / or a laser cutter and / or an electrical discharge machining (EDM) cutter. Optionally, the grinding wheel will rotate counter to the winding of the line. Optionally, a rounded end can be formed on the line. In some embodiments, the coupling between the endodontic brush and the handpiece is configured to be rotatably retained to the handpiece by friction and / or to be longitudinally locked into the handpiece by interference elements. In some embodiments, the edge of the brush is roughened. Optionally, the brush can be curved and / or off-center.

Description

[0001] (Multiple) related applications

[0002] This application claims the benefit of priority under U.S.C. §119(e). Provisional Patent Application No. 63 / 108,363, filed November 1, 2020, is incorporated herein by reference in its entirety.

[0003] This application claims the benefit of priority under U.S.C. §119(e). Provisional Patent Application No. 62 / 988,453, filed March 12, 2020, is incorporated herein by reference in its entirety.

[0004] Field and background of the invention

[0005] In some embodiments of the present invention, therein relates to a pulp brush, and more specifically, but not exclusively, to an improved shaping of its distal end.

[0006] U.S. Patent No. 8790116, which has inventors overlapping with this application, appears to disclose “a dental pulp file (10) having at least a central longitudinal cable (12), a spiral winding (14) at least partially surrounding the cable, and an elastic handle (16) having an outer diameter that partially covers the spiral winding near its first end and is slightly wider than the inner diameter of the barrel of a dental instrument, thereby being supported therein by friction only when inserted into the barrel.”

[0007] U.S. Patent No. 9,585,731 appears to disclose an endodontic file (10) having a handle (11) and a helical cable (15) with a spirally wound metal wire wound around a central metal wire (13) between opposite ends of the central cable in a predetermined direction, thereby forming an assembly structure (18) having a substantially tapered cross-section, the assembly structure (18) including a narrow end (17) and a relatively wider upper end (16), the assembly structure (18) being supported at the upper end by the handle. Flexible tapered reinforcements (26, 31) supported by the handle cover the outermost layer of the upper portion of the helical cable away from the end, the lower end having a sufficiently small diameter to enter the root canal and the upper end being selected in size to limit the bending of the upper portion. The outer surface (20) of the helical cable is configured to remove material from within the root canal when the endodontic file is rotated in a predetermined direction.

[0008] U.S. Patent No. 8,647,116 appears to disclose “a dental pulp file (10) having at least a central longitudinal cable (12), a helical winding (14) at least partially surrounding the cable, and an elastic handle (16) having an outer diameter near its first end that partially covers the helical winding and has an outer diameter slightly wider than the inner diameter of the barrel of a dental instrument, thereby being supported therein by friction only when inserted into the barrel.”

[0009] U.S. Patent Publication No. 20140004479 appears to disclose “a dental endodontic instrument for drilling root canals of teeth. The instrument includes a working area for forming and / or shaping and / or cutting the root canal walls of the tooth. The working area is provided with a support end piece that can be connected to a manually or mechanically driven mounting. The working area is arranged in a retracted configuration when the instrument is in a non-operating position to a working position, and vice versa, due to a predetermined change in instrument temperature. For this purpose, the working area is made of a metal alloy wire having shape memory properties or specific elastic properties.”

[0010] U.S. Patent No. 9931179 appears to disclose “a method of forming a dental tool or instrument with a shape memory. The method includes: selecting a nitinol wire having an initial transformation temperature below room temperature; grinding the nitinol wire to form the dental tool or instrument to have a handle and a working area, the handle being positioned adjacent to a first end and the working area having at least one cutting edge being positioned adjacent to an opposite second front end; shaping the working area into a shaped form having at least one protrusion formed therein; heating the dental tool or instrument to both: a) changing the initial transformation temperature of the dental tool or instrument to a final transformation temperature; and b) memorizing the shaped form including the at least one protrusion, such that when the dental tool or instrument is at or above the final transformation temperature, the dental tool or instrument will automatically return to the shaped form having the at least one protrusion.”

[0011] Comparison of the Efficacy of Different Techniques for the Removal of Root Canal Filling Material in Artificial Teeth: A Micro-Computed Tomography by Tuan Anh Nguyen, Yaelim Kim, Euiseong Kim, Su-Jung Shin and Sunil Kim in J. Clin. Med. 2019, 8(7), 984; https: / / doi.org / 10.3390 / jcm8070984 Study (Comparative Study of the Effectiveness of Different Techniques for Removing Artificial Dental Root Canal Filling Material: Micro-CT (Computed Tomography) Research). The study aims to evaluate the effectiveness of luminal filling material removal using three different techniques after filling with GP cones and calcium silicate-based sealant by measuring the percentage of volumetric debris remaining in the root canals using micro-computed tomography (micro-CT). Filling material was removed from 30 plastic teeth using a nickel-titanium (Ni-Ti) rotary processing system. Final irrigation was performed with 2 mL of physiological saline, and 10 specimens were randomly assigned to the routine group. In the passive ultrasonic irrigation (PUI) group, ultrasonic irrigation was added to the routine... The standard group (n=10) was supplemented with a GF brush for irrigation. Micro-CT imaging analysis was used to measure residual filling material. The total average volume of residual filling material after reprocessing in the standard group, PUI group, and GF brush group were 4.84896 mm³, 0.80702 mm³, and 0.05248 mm³, respectively. The percentage of residual filling material in the root canal was 6.76% in the standard group, 1.12% in the PUI group, and 0.07% in the GF brush group. This study demonstrates that the GF brush system is superior to the Ni-Ti reprocessing file and PUI system in cleaning the apical region.

[0012] Additional background information includes the use of the latest generation of reaming instruments by Francesco Bellucci and Emanuele Ambu in Endodontics, dated December 4, 2017. Invention Overview

[0014] According to one aspect of some embodiments of the present invention, a dental pulp brush is provided, comprising: a connector for attachment to a handheld device; a central longitudinal flexible core supported at an end of the handheld device by the connector; and a tip of the core comprising strands wound in a winding direction and not bonded, such that during use, when the brush is rotated in a direction opposite to the winding direction, the strands unwind and open to form a brush, and wherein the tip is unevenly cut.

[0015] According to some embodiments of the present invention, the multiple strands are wrapped around the inner central flexible cable.

[0016] According to some embodiments of the invention, the pulp brush further includes a spiral that at least partially surrounds the core and extends toward a tip of the core opposite to an end of the handle, wherein the tip protrudes beyond the spiral at the tip.

[0017] According to some embodiments of the present invention, the surface of the helix is ​​roughened.

[0018] According to some embodiments of the invention, the distal portion of the helix is ​​longitudinally stretched and laterally narrowed.

[0019] According to some embodiments of the invention, the winding at the distal portion of the spiral is looser compared to the middle portion.

[0020] According to some embodiments of the invention, the winding on the distal portion of the helix is ​​oriented parallel to the longitudinal flexible core.

[0021] According to some embodiments of the invention, the middle portion of the pulp brush is curved.

[0022] According to some embodiments of the invention, the middle portion of the pulp brush is curved.

[0023] According to some embodiments of the invention, the strand is wound in a direction opposite to the spiral, thereby rotating the brush in the winding direction of the spiral both tightens the spiral and unwinds the strand.

[0024] According to some embodiments of the invention, the strand is wound in the same direction as the helix, thereby rotating the brush in the winding direction of the helix to tighten both the helix and the strand, and rotating the brush in the unwinding direction of the helix to unwind both the helix and the strand.

[0025] According to some embodiments of the invention, the tip is cut along a line at an angle between 10 and 80 degrees to the axis of the core.

[0026] According to some embodiments of the invention, the tip is cut along a line at an angle between 25 and 75 degrees to the axis of the core.

[0027] According to some embodiments of the invention, the tip is cut using an abrasive cutter.

[0028] According to some embodiments of the invention, the tip is cut using a laser cutter.

[0029] According to some embodiments of the invention, the tip is cut using an electrical discharge machining (EDM) cutter.

[0030] According to some embodiments of the invention, the tip is cut along a line at an acute angle to the axis of the core.

[0031] According to some embodiments of the invention, the connector is configured to lock longitudinally to the handheld device, and wherein the rotational connection between the connector and the handheld device is achieved by friction.

[0032] According to some embodiments of the present invention, the middle portion of the pulp brush includes a rough edge.

[0033] According to some embodiments of the invention, the proximal portion of the flexible core is bent inside the connector.

[0034] According to some embodiments of the present invention, the middle portion of the pulp brush is roughened.

[0035] According to one aspect of some embodiments of the present invention, a method of manufacturing a dental pulp brush is provided, comprising: supplying a connector for attachment to a handheld device; winding a plurality of strands in a winding direction to form a flexible core; supporting the flexible core at an end of the handheld device via the connector; the tip of the core opposite to the end of the handheld device being unbonded such that during use, when the brush is rotated in a direction opposite to the winding direction, the strands unwind and open to form a brush; and cutting the tip unevenly.

[0036] According to some embodiments of the invention, the winding is around an inner central flexible cable.

[0037] According to some embodiments of the invention, the method further includes spirally winding a thread at least partially around the core and extending toward a tip of the core opposite to the end of the handle, wherein an unbonded portion of the core protrudes beyond the spiral thread at the tip.

[0038] According to some embodiments of the invention, the cutting is performed along a line at an acute angle to the axis of the core.

[0039] According to some embodiments of the invention, the cutting is performed along a line at an angle between 10 and 80 degrees to the axis of the core.

[0040] According to some embodiments of the invention, the cutting is performed along a line at an angle between 25 and 75 degrees to the axis of the core.

[0041] According to some embodiments of the present invention, the cutting is performed by an abrasive cutter.

[0042] According to some embodiments of the invention, the tip is cut using a laser cutter.

[0043] According to some embodiments of the invention, the tip is cut using an electrical discharge machining (EDM) cutter.

[0044] According to one aspect of some embodiments of the present invention, a dental pulp brush is provided, comprising: a connector for attachment to a handheld device; a central longitudinal flexible core supported at an end of the handheld device by the connector; a tip of the core comprising multiple strands wound in a winding direction and not bonded, such that during use, when the brush is rotated in a direction opposite to the winding direction, the strands unwind and open to form a brush; and a helix at least partially surrounding the core and extending toward the tip of the core opposite to an end of the handle, wherein the tip protrudes beyond the helix at the tip, and wherein the surface of the helix is ​​roughened.

[0045] According to some embodiments of the invention, the distal portion of the helix is ​​longitudinally stretched and laterally narrowed.

[0046] According to some embodiments of the invention, the winding at the distal portion of the spiral is looser compared to the middle portion.

[0047] According to some embodiments of the invention, the winding on the distal portion of the helix is ​​oriented parallel to the longitudinal flexible core.

[0048] According to some embodiments of the invention, the middle portion of the pulp brush is curved.

[0049] According to some embodiments of the invention, the middle portion of the pulp brush is curved.

[0050] According to some embodiments of the invention, the proximal portion of the flexible core is bent inside the connector.

[0051] According to one aspect of some embodiments of the present invention, a dental pulp file is provided, comprising: a proximal handle configured for attachment to a dental handpiece for rotation about a rotation axis, the handle having an average center of mass; and a curved body comprising: a central core and a helix wound around the core.

[0052] According to some embodiments of the present invention, the central core comprises a bundle of strands.

[0053] According to some embodiments of the invention, the distal portion of the core is free, thereby allowing the strands to unfold to form a brush.

[0054] According to some embodiments of the invention, the width of each of the strands is in the range of 5 / 100 to 1 / 10 mm.

[0055] According to some embodiments of the present invention, the width of the core is in the range of 1 / 10 to 8 / 10 mm.

[0056] According to some embodiments of the present invention, the width of the helix is ​​in the range of 1 / 10 to 6 / 10 mm.

[0057] According to some embodiments of the present invention, the pulp file further includes a distal brush portion.

[0058] According to some embodiments of the invention, the geometry of the file is eccentric.

[0059] According to some embodiments of the invention, the geometry of the file is snake-like.

[0060] According to some embodiments of the present invention, a dental pulp file is provided, comprising: a proximal handle configured for attachment to a dental handpiece for rotation about an axis of rotation, the handle having an average center of mass; a transition portion distal to the handle, wherein the distance between the axis of rotation and an unstressed local center of mass of the file increases distally; and a distal portion extending from the transition portion to a distal tip, wherein the unstressed local center of mass of the distal portion is consistently located on the same side of the axis of rotation, and the distance between the axis of rotation and the unstressed local center of mass of the distal portion is greater than the distance between the central mass of the handle and the axis of rotation.

[0061] According to some embodiments of the present invention, the coefficient of variation of the distance between the unstressed local centroids of the file in the distal portion is less than 1 / 2.

[0062] According to some embodiments of the invention, the distance between the unstressed local centroids of the file at various points within the distal portion is less than twice the distance between the centroid of the handle and the axis of rotation.

[0063] According to some embodiments of the present invention, the length of the transition portion is less than 1 / 5 of the total length of the file.

[0064] According to some embodiments of the present invention, the pulp file further includes: a flexible cleaning rod protruding distally from the handle, wherein the transition portion and the distal portion are within the flexible cleaning rod.

[0065] According to some embodiments of the present invention, the flexibility of the flexible cleaning rod increases towards the distal end.

[0066] According to some embodiments of the present invention, the flexible cleaning rod includes an inner core and a spiral wrapped around the inner core.

[0067] According to some embodiments of the invention, the flexible cleaning rod further includes an outer spiral wrapping element that wraps around the spiral.

[0068] According to some embodiments of the invention, the outer spiral wrapping has a rough surface for cleaning the interior of the pulp canal.

[0069] According to some embodiments of the present invention, a kit for pulp cleaning is provided, comprising: a sterile eccentric pulp file including a proximal handle configured for attachment to a dental handpiece for rotation about an axis of rotation, the handle having a mean center of mass; and a flexible cleaning rod having a distal movable portion configured to rotate within a pulp canal to clean the interior of the canal; the cleaning rod being located away from the handle, wherein the distance between the axis of rotation and an unstressed local center of mass of the distal movable portion is greater than half the radius of the handle; and sterile packaging for maintaining the sterile state of the sterile eccentric pulp file.

[0070] According to some embodiments of the invention, the distance between the rotation axis and the unstressed local centroid of the distal movable portion is greater than the radius of the handle.

[0071] According to some embodiments of the present invention, the flexible cleaning rod includes an inner core and a spiral wrapped around the inner core.

[0072] According to some embodiments of the invention, the flexible cleaning rod further includes an outer spiral wrapping element that wraps around the spiral.

[0073] According to some embodiments of the invention, the outer spiral wrapping has a rough surface for cleaning the interior of the tube.

[0074] According to some embodiments of the present invention, a dental pulp file is provided, comprising: a proximal handle configured for attachment to a dental handpiece for rotation about an axis of rotation, the handle having an average center of mass; a transition portion distal to the handle, wherein the distance between the axis of rotation and an unstressed local center of mass of the file increases distally; and a distal portion extending from the transition portion to a distal tip, wherein the unstressed local center of mass of the distal portion is consistently located on the same side of the axis of rotation, and the distance between the axis of rotation and the unstressed local center of mass of the distal portion is greater than the distance between the central mass of the handle and the axis of rotation.

[0075] According to some embodiments of the present invention, a method of producing a dental pulp file is provided, comprising: providing a sterile eccentric dental pulp file including a proximal handle configured for attachment to a dental handpiece for rotation about an axis of rotation, the handle having a mean center of mass, and a flexible cleaning rod having a distal movable portion configured to rotate within a pulp canal to clean the interior of the canal; the cleaning rod being located away from the handle, wherein the distance between the axis of rotation and an unstressed local center of mass of the distal movable portion is greater than half the radius of the handle; sterilizing the eccentric dental pulp file; and aseptically packaging the dental pulp file in a sterile preservation package.

[0076] According to some embodiments of the invention, the distance between the rotation axis and the unstressed local centroid of the distal movable portion is greater than the radius of the handle.

[0077] According to some embodiments of the present invention, the flexible cleaning rod includes an inner core and a spiral wrapped around the inner core.

[0078] According to some embodiments of the invention, the flexible cleaning rod further includes an outer spiral wrapping element that wraps around the spiral.

[0079] According to some embodiments of the invention, the outer spiral wrapping has a rough surface for cleaning the interior of the tube.

[0080] According to some embodiments of the present invention, a method for cleaning a dental pulp canal is provided, comprising: attaching an eccentric flexible pulp file to a dental handheld device; rotating the file to produce an unfolding of the distal portion of the brush.

[0081] According to some embodiments of the present invention, a method for cleaning a pulp brush is provided, comprising: connecting the proximal handle of an eccentric flexible pulp file to a dental handheld device; and unfolding the distal portion of the file in a churning motion by rotating the proximal handle of the file.

[0082] Unless otherwise defined, all technical and / or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art in the field to which this invention pertains. Although similar or equivalent methods and materials to those described herein may be used in the practice or testing of embodiments of the invention, exemplary methods and / or materials are described below. In case of any inconsistency, the patent specification, including its definitions, shall prevail. Furthermore, these materials, methods, and examples are illustrative only and do not constitute necessary limitations.

[0083] Brief description of the multi-view diagram in the attached figure

[0084] Some embodiments of the present invention have been described by way of example only with reference to the accompanying drawings. It is now particularly emphasized with reference to the drawings that the details shown are by way of example and for the purpose of illustrative discussion of embodiments of the invention. In this respect, the description with reference to the drawings is intended to make it clear to those skilled in the art how to practice embodiments of the invention.

[0085] In the attached diagram:

[0086] Figure 1A illustrates the distal end of an unevenly cut pulp brush in a closed configuration according to an embodiment of the present invention.

[0087] Figure 1B illustrates the distal end of an unevenly cut pulp brush in a partially open configuration according to an embodiment of the present invention.

[0088] Figure 1C The illustration shows a strand cut at a certain angle according to an embodiment of the present invention.

[0089] Figure 2 The illustration shows the distal end of a pulp-cutting brush according to an embodiment of the present invention.

[0090] Figures 3A and 3B illustrate implementation methods of a pulp brush cut using cutting forceps;

[0091] Figures 3C and 3D illustrate portions of a pulp brush cut using an abrasive cutter according to an embodiment of the present invention.

[0092] Figure 4 This is an image illustrating a channel cleaned using a brush according to an embodiment of the present invention;

[0093] Figure 5 These are images illustrating an exemplary experiment demonstrating the effect of centrifugal force;

[0094] Figures 6A-6D illustrate cross-sections of exemplary channels cleaned according to embodiments of the present invention;

[0095] Figure 7 illustrates, at 500x magnification, the surface 740 of the tip portion of a channel in a tooth cleaned with a pulp brush according to an embodiment of the present invention.

[0096] Figure 8 This is a flowchart illustrating a method for cutting the distal end of a pulp brush according to an embodiment of the present invention;

[0097] Figure 9 This is a flowchart illustrating the cleaning of the dental pulp channel according to an embodiment of the present invention;

[0098] Figure 10 The illustration shows an endodontic tool (e.g., brush and / or file) assembly according to an embodiment of the present invention;

[0099] Figure 11A and 11B The illustration shows a dental pulp instrument according to an embodiment of the present invention;

[0100] Figure 12 This is a schematic diagram of a pulp brush according to an embodiment of the present invention;

[0101] Figure 13 This is a schematic diagram of a pulp brush with a stretchable end according to an embodiment of the present invention;

[0102] Figure 14 This is a schematic diagram of an eccentric pulp brush according to an embodiment of the present invention;

[0103] Figure 15 This is a schematic diagram of an eccentric pulp brush according to an embodiment of the present invention;

[0104] Figure 16 The illustration shows a pulp brush in a simulated channel according to an embodiment of the present invention;

[0105] Figure 17 The illustration shows a schematic diagram of a pulp brush with rough edges according to an embodiment of the present invention.

[0106] Figure 18 This is a block diagram of an eccentric pulp file according to an embodiment of the present invention;

[0107] Figure 19 This is a flowchart illustrating the cleaning of the pulp canal according to an embodiment of the present invention;

[0108] Figure 20 This is a block diagram of a kit including an eccentric pulp file according to an embodiment of the present invention;

[0109] Figure 21 This is a flowchart illustrating the preparation of a kit including an eccentric pulp file according to an embodiment of the present invention;

[0110] Figure 22 is a schematic diagram of an eccentric pulp file according to an embodiment of the present invention;

[0111] Figure 23 is a schematic diagram of a portion and the average center of gravity of an eccentric pulp file according to an embodiment of the present invention;

[0112] Figure 24 This is a schematic diagram of the stirring motion of an eccentric pulp file according to an embodiment of the present invention;

[0113] Figure 25A This is a schematic diagram of an eccentric pulp file that is shallowly inserted into a tube according to an embodiment of the present invention;

[0114] Figure 25B This is a schematic diagram of an eccentric pulp file deeply inserted into a tube according to an embodiment of the present invention;

[0115] Figure 26A is a low-magnification image of an eccentric pulp file according to an embodiment of the present invention;

[0116] Figure 26B is a medium magnification image of an eccentric pulp file according to an embodiment of the present invention;

[0117] Figure 26C is a high-magnification image of an eccentric pulp file according to an embodiment of the present invention;

[0118] Figure 27A This is a height-enlarged schematic diagram of the longitudinal cross-section of a three-layer eccentric pulp file according to an embodiment of the present invention;

[0119] Figure 27B This is a height-enlarged schematic diagram of the longitudinal cross-section of a two-layer eccentric pulp file according to an embodiment of the present invention;

[0120] Figure 28A This is a schematic diagram of a wavy file with a brush end according to an embodiment of the present invention;

[0121] Figure 28B This is a schematic diagram of a wavy file with a closed tip according to an embodiment of the present invention;

[0122] Figure 29 This is a block diagram of a curved file according to an embodiment of the present invention;

[0123] Figure 30 This is a flowchart illustrating a method for cleaning a tube according to an embodiment of the present invention; and

[0124] Figure 31 This is a flowchart illustrating a two-step method for cleaning a tube according to an embodiment of the present invention.

[0125] Description of specific embodiments of the present invention

[0126] In some embodiments of the present invention, therein relates to a pulp brush, and more specifically, but not exclusively, to an improved shaping of its distal end.

[0127] Some embodiments of the present invention have been described by way of example only with reference to the accompanying drawings. It is now particularly emphasized with reference to the drawings that the details shown are by way of example and for the purpose of illustrative discussion of embodiments of the invention. In this respect, the description with reference to the drawings is intended to make it clear to those skilled in the art how to practice embodiments of the invention.

[0128] Overview

[0129] Some aspects of this invention involve non-uniformly (e.g., not along a line perpendicular to the brush axis) cutting the distal end of the pulp brush. Optionally, when the brush strands are spread, each strand will contact the channel wall at a different location than the other strands. Optionally, when the brush strands are not spread, for example, when used in narrow channels, the non-uniform ends of the brush will have an increased agitation effect on the fluid in the channel compared to uniformly cut ends. Separating the locations where the different strands of the brush contact the channel wall may inhibit the grooving and / or cutting of the channel wall. Separating the locations where the different strands of the brush contact the channel wall may help to clean the channel wall evenly. For example, the distal end of the brush may be cut at an acute angle relative to the brush axis. For example, the angle between the cut end and the axis may preferably be between 30 degrees and 45 degrees and / or in the range between 45 degrees and 75 degrees and / or in the range between 5 degrees and 30 degrees and / or in the range between 75 degrees and 85 degrees.

[0130] Some aspects of this invention relate to cutting the distal end of a pulp brush. For example, the end can be cut using an abrasive cutter (e.g., a grinding wheel) and / or a laser cutter and / or an electrical discharge machining (EDM) cutter. Conventional wire brushes are cut using a scissor-type cutter. This cutting technique can leave uneven cuts on different strands and / or bend the ends of the wire, thus preventing proper opening of the brush. In some embodiments, the grinding wheel will rotate relative to the winding of the wire, for example, to avoid unraveling the cable during cutting. Alternatively, a rounded end can be formed on the wire, for example, by heating the end of the wire.

[0131] Some embodiments of the invention relate to a coupling device between a dental pulp brush and a handheld device, the coupling device being configured to be more securely held to the handheld device to prevent longitudinal slippage rather than rotational slippage. For example, the coupling device may be frictionally rotatably connected to the handheld device and / or longitudinally locked into the handheld device by an interference element. For example, when the torque between the coupling device and the handheld device becomes too high, the coupling device may slip relative to the handheld device (e.g., to protect the brush and / or teeth from high torque). Additionally and / or alternatively, the coupling device may be longitudinally locked to the handheld device to prevent separation of the coupling device from the handheld device.

[0132] Some aspects of the present invention relate to a pulp brush and / or pulp file having a helical outer coil unwinding toward its distal end. In some embodiments, the proximal portion of the pulp brush may include an inner core (e.g., the core may include a cable comprising 1 to 5 and / or 5 to 10 and / or 10 to 20 strands, each strand having a diameter, for example, between 0.02 and 0.15 mm, and the core diameter may be in the range of 0.05-0.30 mm) and / or an outer coil helically wound around the core (e.g., the cord of the outer coil may be a wire and / or may have a diameter ranging from 0.1 to 0.4 mm). For example, the diameter of the brush / file in the proximal portion may be twice the diameter of the cord of the coil plus the diameter of the wire. Optionally, at the distal end, the core may be exposed (e.g., the cable may be opened into a brush). For example, in the distal region, the diameter of the brush / file may be the diameter of the core. In some implementations, there may be (e.g., between the proximal portion of the brush / file and the exposed portion of the core) an area where the cord of the coil is an unwound brush / file. For example, the distal end of the cord of the coil may be substantially straight and / or parallel to the core and / or oriented longitudinally. For example, in cases where the cord and / or coil operate substantially parallel to each other, the width of the brush / file may be equal to the diameter of the core plus the diameter of the cord of the coil. Optionally, the distal end of the cord may be stretched and / or tapered.

[0133] Some aspects of the present invention relate to an endodontic tool comprising a brush at its distal end and / or a file at its proximal portion. In some embodiments, the proximal portion of the endodontic brush may include an inner core (e.g., the core may include a cable comprising 1 to 5 and / or 5 to 10 and / or 10 to 20 strands, each strand having a diameter, for example, between 0.02 and 0.15 mm, and the core diameter may be in the range of 0.05-0.30 mm) and / or an outer coil helically wound around the cable (e.g., the cord of the outer coil may be a thread and / or may have a diameter ranging from 0.1 to 0.4 mm). Optionally, the outer coil may include a roughened surface. For example, the roughened surface may be configured to file down the proximal portion of the pulp passage. Optionally, the brush may include a distal portion in which the core is exposed. For example, the distal portion may have a length between 1 and 3 mm and / or between 3 and 9 mm and / or between 9 and 12 mm. Optionally, the distal end of the tool may be configured to open as a brush. Optionally, the file and / or brush can be configured to revolve during rotation. For example, the proximal portion of the tool may be eccentrically mounted in the rotating handle and / or at an angle to the axis of rotation of the handle. Alternatively or additionally, the tool (file and / or brush) may be curved and / or wavy. Optionally, the brush and / or file is flexible. For example, the centrifugal force of rotating the tool may cause the file and / or brush to bend outward. The outward movement of the file / brush may cause it to contact the lateral surfaces of the pulp passage and / or to scrape and / or clean the lateral surfaces of the passage.

[0134] Some aspects of the present invention relate to a dental apex having an active distal portion eccentrically positioned relative to a handle attachment for rotation. In some embodiments, the apex is configured such that rotation of the handle causes a churning motion of the distal portion of the apex. Optionally, the churning motion causes the active portion of the apex to clean the surfaces within the tube more thoroughly and / or more uniformly. In some embodiments, the apex is packaged in sterile packaging and / or supplied to a dentist. Optionally, the active portion of the apex is highly flexible. For example, the active portion may include one or more spirals wrapped around a central cable. In some embodiments, the active portion of the apex is made more flexible to move distally along its length. Optionally, the apex includes a handle for a dental handpiece at its proximal end. At the distal end of the adapter, there is an optional transition region where local eccentricity increases with distal movement. Optionally, in a stress-free state, the active portions of the apex away from the transition region are all on one side of the rotation axis of the handle. For example, in a stationary state, the center of mass of the active portion and / or the center of mass of the active portion away from the transition portion may be offset from the rotation axis of the handle. For example, in a stationary state, the center of mass of the moving part and / or the center of mass of the moving part away from the transition part can move further away from the rotation axis of the handle than the radius of the handle. For example, in a stationary state, the average center of mass of the moving part and / or the average center of mass of the moving part away from the transition part can move further away from the rotation axis of the handle than the radius of the handle.

[0135] Various embodiments of the invention may include end-openings (e.g., brushes) and / or end-closeds (e.g., files) having straight, concentric, eccentric, curved, and / or undulating shapes. The core winding may be twisted in the same direction as and / or in the opposite direction to the outer winding. The outer winding may be roughened and / or smoothed. The distal end of the instrument may be perpendicular to its axis and / or cut at an acute angle. Detailed Implementation

[0136] Before explaining at least one embodiment of the present invention in detail, it should be understood that the present invention is not necessarily limited to the details of the construction and arrangement of the components and / or methods set forth in the following description and / or the drawings and / or examples. The present invention can be practiced or implemented in various ways in other ways.

[0137] Figure 1A illustrates the distal end of an unevenly cut endodontic brush in a closed configuration according to an embodiment of the invention. In some embodiments, the endodontic tool may be configured to clean both the tip and proximal portions of the tube. For example, the distal end of the tool may be formed as a brush. The brush may clean the tip portion of the tube. Optionally, the intermediate and / or proximal portions may include a winding 108. Optionally, the surface of the winding 108 may be roughened and / or the winding may be flexible. For example, the winding 108 may clean the sides of the intermediate and / or proximal portions of the tube. Optionally, the tool may be straight. Alternatively or additionally, the tool may be eccentric and / or curved. In some embodiments, the winding 108 may be sharpened, for example, toward its distal end. Optionally, the strands of the central core may be twisted in the same direction as the winding. Alternatively or additionally, the strands of the central core may be twisted in the opposite direction to the winding.

[0138] Figure 1B illustrates the unevenly cut distal end of a partially open pulp brush according to an embodiment of the invention. In some embodiments, the distal end of the brush includes an unbonded tip 102 of the cable. Optionally, the distal end 104 of the brush is cut diagonally relative to the axis of the brush (e.g., relative to the axis of the brush coupling and / or the axis of the brush core 106). In some embodiments, the uneven cutting of the cable strands increases the contact area of ​​the cable against the channel wall when the brush is open in the channel. In some embodiments, the uneven cutting of the cable strands reduces the chance of the brush cutting grooves into the channel wall when the brush is open in the channel.

[0139] Figure 1C The illustration shows a strand cut at an angle according to an embodiment of the invention. Cutting the core and / or winding at an angle can have a sharpening effect on the strand. For example, when a cylindrical strand 131 with a circular cross-section is cut at an angle, the cut surface 133 has an elliptical periphery 135. The vertex 137 of the ellipse will be sharper than the periphery of a circular surface produced by a cut perpendicular to the axis of the cylinder.

[0140] In some embodiments, the pulp brush is used with a rotary handheld device capable of rotating at speeds, for example, ranging from 4,000 to 40,000 rpm. Optionally (e.g., as shown in FIG. 7), the brush assembly includes a central longitudinal core 106 for coupling to the handheld device and / or anchored within a first end of the coupling element. Optionally, in use, the coupling is secured within the handheld device and for this purpose will be referred to throughout the specification and claims as the "handheld end". In some embodiments, a helical winding (e.g., helical winding 108) partially surrounds the core and is wound in a first direction (e.g., clockwise) such that the helix tends to tighten as the brush rotates clockwise. In some embodiments, the winding prevents the helix from opening when the brush is inserted into the root canal, thereby preventing it from jamming against its inner wall. The helix may optionally extend toward a second end of a cord opposite the end of the handle, protruding beyond the helix 108, and will be referred to throughout the specification and claims as the distal end and / or "tip". The tip of core 106 may optionally be unattached on its side; for example, the protrusion may extend 2 to 9 mm beyond the spiral, and / or may be unattached 2-9 mm from its distal end near the tip. In some embodiments, the brush may be inserted into the tube without rotation and / or may be inserted into the tube while rotating in the unwinding direction.

[0141] The center cable (e.g., core 106) typically comprises a central single cord and / or multiple strands (e.g., 4-20) forming a flexible cable. Optionally, the cable is twisted and / or wound. In some embodiments, core 106 may include an inner cable around which strands are optionally wound. Optionally, the inner cable may include wire. For example, the wire may be twisted in the opposite direction of the strand winding. Alternatively or additionally, the wire may be twisted in the same direction as the strand winding. Optionally, the strands and / or wires of the core comprise stainless steel fibers and / or have a cross-sectional width of about 0.03-0.10 mm. The surrounding helical winding is optionally made of stainless steel and / or has a cross-sectional width of 0.2 to 0.4 mm. In one embodiment, the strands are wound in the opposite direction to the helix 108. Optionally or additionally, the strands are wound in the same direction as the helix 108. Alternatively or additionally, no strands are wound. The diameter of core 106 is typically in the range of, for example, 0.15-0.35 mm. Optionally, when the strands are wound around the inner cable, 30% to 70% of the diameter of core 106 is the inner cable, and / or 30% to 70% of the diameter of core 106 is the outer strand. Optionally, the distal end of the core is thinner and extends deep into the root canal, for example, reaching its apex and / or the last millimeter.

[0142] In some embodiments, during operation, the connector is attached to a dental handpiece and / or distally inserted into the root canal of the tooth. Optionally, a manual reciprocating motion is provided while the handpiece is set to rotate, for example, at speeds ranging from 2000 to 6000 rpm and / or 6000 to 30000 rpm. A portion of the helix 108 can be centrifugally propelled against the inner dentin layer of the canal wall following the natural curvature and / or complex cross-section of the root canal. Optionally, the dentin layer can be ground and / or polished. The optional reciprocating motion can introduce lubricant and / or flush away debris with a constant flow of water supplied by the handpiece.

[0143] In some implementations, after the tip 104 of the core 106 reaches the desired position (e.g., the top of the channel contracts), the assembly rotates in the opposite direction and / or the brush is withdrawn from the root canal. Optionally, this has the effect of unwinding the twisted strands of the core to form a brush as shown, thereby providing efficient removal of debris.

[0144] In some implementations, the distal end of the cutting tip unevenly increases the contact area between the strands of core 106 and the wall of the channel. For example, when the brush is open, the short strands contact the wall at a different location than the long strands 110. This can, for example, contribute to contact with a larger area of ​​the channel wall compared to strands that are cut uniformly perpendicular to the brush axis. This can result in better cleaning, for example, when the brush moves slowly along the channel and / or the brush remains longitudinally stationary relative to the channel.

[0145] In some implementations, unevenly cutting the brush (e.g., individual strands of different brushes having different lengths) can reduce the likelihood of scratching the channel wall. For example, when multiple strands are all of the same size, they can scratch the same area of ​​the wall. If the brush cannot move longitudinally along the tube fast enough, such multi-strand scraping can create grooves in the channel wall. Alternatively, when the brush is unevenly cut and / or the strands have different lengths, they will each scratch different areas of the wall, thereby reducing the likelihood of repeatedly scratching a portion and / or more than other areas of the wall. For example, this can suppress and / or reduce the likelihood of creating grooves and / or deep scratches in the channel wall (e.g., when the brush is kept rotating without longitudinal movement, such as when the user is not working according to a protocol of backward and / or forward and backward movement and / or pauses during longitudinal movement).

[0146] In some implementations, a uniformly cut brush (where the distal end of the strand cuts uniformly perpendicular to the shank) can be used as a specific tool, for example, in cases where a structure needs to be removed (e.g., a protrusion in the tube wall and / or a specific blockage where concentrated scoring can facilitate the removal of the blockage).

[0147] In some embodiments, a brush is used to sterilize and / or evacuate the disinfectant fluid using centrifugal force. For example, centrifugal force can be created as a result of the brush's high-rate rotation (e.g., between 1000 and 1500 rpm and / or between 1500 and 8000 rpm and / or between 8000 and 20000 rpm and / or between 20000 and 50000 rpm and / or between 50000 and 150000 rpm). Optionally, the rotation is in the opposite direction to the winding of the strands of the brush's core and / or tip. For example, this can open the brush and / or expose the fluid to the rotating strands of the brush. In very small channels, the brush may not have enough space to be fully open. In this case, the uneven cutting of the distal end 104 of the brush can increase turbulence and / or mixing effects (e.g., because even in a closed configuration, individual fibers are exposed to the fluid differently).

[0148] In some implementations, the brush is opened and / or activated only after the disinfectant has been injected into the open tube, and / or only after it has been inserted into a tube containing fluid. For example, this can prevent damage and splashing of the fluid outside the channel.

[0149] In some embodiments, the uneven cutting of the distal end 104 of the brush can facilitate the brush's penetration into thin portions of the channel (e.g., tip contraction). For example, when the brush is cut at an angle, the width of the distal end of the tip can be smaller than the large diameter of the core 106. For example, at its most distal end, the brush can consist of one or more longer final strands 110. These strands can enter very narrow contraction portions, for example, even narrower than the core 106 of the brush.

[0150] Figure 2 The illustration shows the distal end of a cutting pulp brush according to an embodiment of the invention. In some embodiments, an abrasive cutter (e.g., a rotating abrasive disc 212) is used to cut the thread at the distal end of the pulp brush 206. The applicant has observed that conventional cutting cutters (e.g., shear cutters and / or wedge cutters [e.g., diagonal cutters]) and / or scissor cutters sometimes fail to cut cleanly. Such cutters (especially for such small strands with diameters between 0.02 and 0.15 mm) can cause curling at the ends of the cut strands and / or can cause the strands to stick together. In some cases, cutting such strands with an abrasive cutter can reduce curling and / or tangling compared to shearing. Alternatively or additionally, laser cutters and / or electrical discharge machining (EDM) cutters can be used to cut the strands.

[0151] In some embodiments, the shaft and / or distal end of brush 206 are held in clamp 214. For example, clamp 214 may include recesses and / or fastening mechanisms (e.g., recessed blocks abutting a smooth block) in which the shaft of pulp brush 206 is placed. In some embodiments, guide 216 is used to control cutting and / or movement. For example, the cutter may move along guide 216 when the pulp brush is stationary, and / or the cutter may move along guide when brush 206 is stationary. Optionally, the pulp brush may be held with its axis perpendicular to the cutter. Alternatively or additionally, the pulp brush 206 may be held with its axis at an acute angle to the cutter. For example, holding the cutter at an acute angle to the cutter may result in uneven cutting of the strands (e.g., longer on one side than on the other). In some embodiments, the cutter is driven to rotate by motor 218. Optionally, the direction of rotation of the cutter is selected to maintain the twisting of the thread of the brush 105 core. For example, a diamond wheel can operate at high rpm and opposite to the twisting direction of the cable fibers and / or along the winding direction of the strands.

[0152] Figures 3A and 3B illustrate embodiments of a pulp brush cut with cutting forceps. In some cases, the cutting forceps will leave protruding strands 320 and / or truncated strands 322. For example, the truncated strands 322 can be curled and / or crushed together. This can, for example, inhibit the opening of the brush.

[0153] Figures 3C and 3D illustrate portions of a dental pulp brush cut using an abrasive cutter rotating along the winding direction of the brush core according to an embodiment of the invention. As can be seen in the figures, the abrasive cutter causes minimal damage to the core 106, cleanly cutting the distal end 104 of the strand without curling and / or tangling.

[0154] Figure 4 This illustration depicts an image of a channel cleaned using a brush according to an embodiment of the invention. In some embodiments, a cleaning solution and / or disinfectant solution is injected into the channel. For example, the solution may include sodium hypochlorite. Optionally, the exterior 428 of the channel is first cleaned using a file, and then the top portion 430 of the channel is cleaned using a brush. Alternatively or additionally, the channel 428 is cleaned in a single step. For example, the brush includes a file that roughens the proximal portion of the wall of the exterior 428 of the channel and is inserted into and cleans the distal portion of the top portion 430 of the channel. The rotation of the brush can induce turbulence in the fluid. Turbulence (e.g., due to friction and / or the momentum of the moving liquid) can clean areas of the channel (except where the fluid is in contact with the brush and / or not in contact with the brush (e.g., in areas of the lateral tube 432 and / or that the brush cannot reach). In some embodiments, biofilm and / or debris can be separated from the walls of the channel by contact with the file and / or brush and / or by the disinfectant and / or by the turbulence.

[0155] Figure 5 These are images illustrating an exemplary experiment demonstrating the effect of centrifugal force. In some embodiments, the high rpm and / or elasticity of the brush generate centrifugal force. Optionally, the dental handheld device 534 rotates the pulp brush 506 within the channel. Centrifugal force may optionally open the brush at the top portion of the channel. The opened brush has a large cross-section and / or high virtual mass and / or effectively imparts rotational energy to the fluid. For example, it can drive the fluid to rotate rapidly and / or rotate under high turbulence (e.g., this can be achieved in...). Figure 5 As observed, for example, by turbidity 536 and the whiteness of the fluid indicating the presence of eddies and entrained bubbles) and / or by deformation of the free surface 537. For example, at speeds greater than 1500 rpm and / or particularly greater than 6000 rpm, the flow can open (e.g., producing a large paddle-shaped profile and / or large virtual mass) and / or induce high turbulence and / or high centrifugal force in the fluid within the channel. The centrifugal force and / or turbulence of the fluid can loosen blockages (e.g., air bubbles, biofilm residues, tube mucus, and / or debris) and / or allow fluid to enter spaces that are difficult to reach by brushing and / or that fluids at lower speeds would not reach (e.g., small tip channels, curved channels, dentinal tubules, and / or pores). Experiments have shown that this leads to improved channel sterilization and / or improved dental treatment outcomes (e.g., improved implant life). Figure 5 In this embodiment, the high centrifugal force acting on the turbulent fluid causes the free surface 537 to tilt relative to gravity and / or flow upwards along the wall of the channel. For example, a brush is shown pushing against the left side of the channel, causing the free surface of the fluid to rise along the left wall. In the exemplary experiment, the high turbidity 536 of the fluid (e.g., its bright white color) is understood as an effect of highly turbulent flow that may cause cavitation. In some embodiments, cavitation of the fluid can increase friction and / or abrasion on the surface even when the brush bristles are not present. For example, this can loosen blockages and / or facilitate sterilization.

[0156] Figures 6A-6D illustrate cross-sections of exemplary channels cleaned according to embodiments of the present invention. The surface of the channels is significantly cleaner than similar channels cleaned using conventional endodontic techniques. For example, Figure 6A illustrates a cross-section of the tip portion 638a of the channel 2 mm from the apex, where even the small tip portion of the channel can be seen to be clean. For example, the thin distal portion of the brush can enter the thin tip portion of channel 638a and / or open and / or clean the walls of the channel under the action of centrifugal force. Figures 6B and 6C illustrate cross-sections of the middle portions of the channel at 4 mm and 6 mm from the apex, respectively. In the exemplary embodiment, the cross-sections of channels 638b, 638c, and 638c' are thin and irregular (e.g., at 638c', the two tip channels of 638b appear to have converged to create a larger irregular channel); however, filing and / or turbulence have cleaned the walls of the channel. For example, in portions 638b, 638c, 638c', the agitation motion (e.g., due to bending of the file and / or its tortuosity under centrifugal force) can cause the rough portions of the file (e.g., on the outer spiral winding) to contact and / or clean the walls of the channel. Figure 6D illustrates an exemplary cross-section of the opening of the channel at a distance of 8 mm from the apex. In the exemplary embodiment, the cross-section of channel 638d is irregular (e.g., at 638d, the two intermediate channels of 638c and 638c' appear to have converged to create a larger irregular channel); however, the file has cleaned the walls of the channel. For example, in portion 638d, the agitation motion of the file and / or bending and / or its tortuosity under centrifugal force can cause the rough portions of the file (e.g., on the outer spiral winding) to contact and / or clean the walls of the channel.

[0157] Figure 7 illustrates, at 500x magnification, the surface 740 of the top of a channel in a tooth cleaned using a pulp brush according to an embodiment of the present invention. Although surface 740 is roughened and has micropores 742, it appears clean. For example, the cleaning ability of the brush may be a result of the scraping and / or turbulence of the brush's strands.

[0158] Figure 8 This is a flowchart illustrating a method for cutting the distal end of a pulp brush according to an embodiment of the present invention. For example, the brush handle may be positioned in a clamp 844. Optionally, the angle of the handle relative to the cutter is fixed (e.g., vertical and / or at a limited angle). Optionally, the abrasive cutter rotates 846 in a direction synchronized with the winding of the strand to be cut (e.g., in the same and / or opposite direction to the winding). Optionally, the strand is then passed across the strand by the cutter 848, thereby cutting the strand.

[0159] Figure 9This is a flowchart illustrating a cleaning of the dental pulp passage according to an embodiment of the present invention. For example, a connector 950 can be locked to a dental handheld device, for example, to inhibit longitudinal movement relative to the handheld device and / or to inhibit disengagement between the handheld device and the brush. Optionally, the locking 950 between the two does not prevent rotational slippage between the connector and the handheld device's fittings (e.g., chuck). For example, the locking element can be rotationally symmetrical. For example, the grip 952 for rotational connection between the handheld device and the connector can be achieved through friction. Optionally, the handheld device rotates 954 of the brush as long as the torque does not exceed a threshold torque. Exceeding the threshold torque, the connector may optionally rotate and slide within the fittings of the handheld device without longitudinal movement relative to the handheld device and / or disengagement from the handheld device.

[0160] In some embodiments, the present invention provides a method for safely limiting the torque applied to a dental pulp tool (e.g., a brush and / or file) using a dental handheld device while preventing disconnection between the tool and the dental handheld device. For example, a connector for the brush is inserted into the mounting sleeve of the dental handheld device, and the connector is longitudinally locked to the handheld device. Optionally, rotational motion is applied to the brush based solely on friction between the handheld device and the connector. For example, friction can be controlled by adjusting the diameter of the connector and / or its material. For example, the connector may comprise an elastic and / or flexible material (e.g., an elastomer) and / or a material with a high coefficient of friction (e.g., an elastomer). Optionally, the applied torque is limited during insertion into the mounting sleeve by a compressive force acting on the connector (which may be slightly greater than the sleeve of the handheld device) and by the coefficient of friction between the connector and the sleeve of the handheld device. Optionally, when the shear force between the brush and the pulp channel increases beyond a predetermined value, the connector will rotate and slide within the sleeve of the handheld device. This can prevent tool breakage and / or undesirable damage to the dentin. The longitudinal lock can prevent undesirable release of the brush from the handheld device. For example, the outer diameter of the connector can be within the following ranges: 100.5% to 102% of the cylinder diameter and / or 102% to 105% of the cylinder diameter and / or 105% to 115% of the cylinder diameter and / or 115% to 150% of the cylinder diameter. For example, the outer diameter of the connector can be within the following ranges: 2.3 to 2.36 mm and / or 2.36 to 2.4 mm and / or 2.4 to 2.5 mm. For example, the outer diameter of the connector can be within the following ranges: 2.0 to 2.05 mm and / or 2.05 to 2.15 mm and / or 2.15 to 2.25 mm.

[0161] Figure 10The illustration depicts a dental endodontic tool (e.g., a brush and / or file) assembly according to an embodiment of the invention. For example, the assembly may include a connector 1056 having a locking element 1058 that overcomes longitudinal forces to lock the tool to a handheld device and / or apply torque between tools having a frictional connection that allows sliding beyond a threshold torque. For example, the connector 1056 may mate with a standard D-ring fitting of a dental handheld device. Optionally, the connector 1056 may be rotationally symmetrical, thus locking to the fitting but allowing rotational sliding. For example, the fitting and / or connector 1056 may be configured to limit the torque between the handheld device and the tool. For example, the friction fitting may allow sliding under torques greater than 0.05 N·cm and / or greater than 0.01 N·cm and / or greater than 0.1 N·cm and / or greater than 0.5 N·cm and / or greater than 1 N·cm. Optionally, the connector 1056 may have standard dimensions, such as a diameter of 2.35 mm, 3.0 mm, and / or 3.175 mm. Alternatively or additionally, accessories may include a circular mandrel for attachment to a standard chuck. Alternatively or additionally, accessories of other types and / or sizes are also possible, such as those between 1 and 2.5 mm and / or between 2.5 and 3.5 mm and / or between 3.5 and 7 mm.

[0162] In some embodiments, the intermediate portion 1060 of the tool includes, for example, a core 1006 (e.g., including a cable) defined by a helical winding 1008. Alternatively, the tool may include an undefined distal portion 1002, wherein the core 1006 is optionally undefined and / or can lead to a brush.

[0163] Figure 11A and 11B The illustration shows a dental pulp instrument according to an embodiment of the present invention. Figure 11A The diagram illustrates a tool before it is attached to a handle (e.g., connector 1156). In some embodiments, the proximal end 1157 of the tool is bent and / or folded within the connector 1156. For example, bending the distal end of the tool can make it easier to attach the tool to the connector 1156. Additionally or alternatively, bending at the proximal portion of the tool can cause the tool to engage eccentrically with the connector 1156 and / or facilitate a churning motion of the tool. For example, the connector can be in the form of a tube with a hollow section (e.g., the hollow section may be open on one or both sides). Optionally, the connector 1156 can be made of a flexible and / or high-friction material (e.g., rubber, elastomer, and / or plastic). Optionally, the bent portion 1157 of the tool is snapped into the cavity of the connector.

[0164] Figure 12This is a schematic diagram of a pulp brush according to an embodiment of the present invention. In some embodiments, the brush includes a central portion 1260 and / or a distal portion 1202. Optionally, the central portion 1260 includes a core 1206 (e.g., comprising multiple strands and / or twisted cables) and / or a spiral winding. In the distal portion 1202, the core 1206 may optionally protrude and / or be unengaged. Optionally, the spiral winding 1208 may be unwound toward the distal portion 1202. For example, the distal portion 1262 of the winding 1208 may be oriented parallel to and / or substantially parallel to the axis of the core 1206 and / or the tool. For example, in the distal portion 1202, the width (e.g., diameter) of the tool may be the thickness 1279 of the core. For example, in the central portion 1260, the width (e.g., diameter) of the tool may be twice the thickness 1279 of the core plus the thickness 1277 of the spiral winding 1208. Alternatively, when the helical winding 1208 is unfolded (e.g., between the intermediate portion 1260 and the distal portion 1202), the width of the tool will be between the width 1272 of the intermediate portion 1260 and the width of the distal portion 1202. For example, in the portion 1262 of the winding 1208 parallel to the core, the width 1274 of the tool can be the width of the core 1206 plus the width 1277 of the winding 1208.

[0165] The inventors have observed that, under certain circumstances, a dental bur can damage the tube. For example, rotating the outer winding 1208 in the winding direction can sometimes cause the hard wire of the outer winding to protrude and / or damage the tube. For example, the distal tip of the outer winding can protrude outward and scrape against the wall of the channel. In some embodiments, the distal tip of the outer winding can be blunt and / or can be pointed in a direction that reduces the likelihood of damage. For example, it can be pointed parallel to the core. This can reduce the likelihood of damaging the channel.

[0166] In some embodiments, the brush and / or file may comprise a single winding 1208 wound around the core 1206. For example, the core 1206 may comprise multiple strands of cable. For example, the strands may all be twisted in the same direction as the outer winding 1208. Alternatively or additionally, the strands may all be twisted in the opposite direction to the outer winding 1208. Alternatively or additionally, the core 1206 may comprise untwisted strands and / or strands twisted in different directions.

[0167] In some embodiments, the width 1277 (e.g., diameter) of the winding 1208 may be in the range of 0.15 to 0.25 mm and / or 0.25 to 0.3 mm and / or 0.3 to 0.4 mm and / or 0.05 to 0.15 mm and / or 0.4 to 0.7 mm.

[0168] In some embodiments, the width 1279 (e.g., diameter) of the core 1206 may be in the range of 0.15 to 0.25 mm and / or 0.25 to 0.3 mm and / or 0.3 to 0.4 mm and / or 0.05 to 0.15 mm and / or 0.4 to 0.7 mm.

[0169] In some embodiments, the width 1272 (e.g., diameter) of the intermediate portion 1260 may be in the range of 0.25 to 0.4 mm and / or 0.4 to 0.7 mm and / or 0.7 to 0.9 mm and / or 0.9 to 1.2 mm.

[0170] In some embodiments, the width 1274 (e.g., diameter) of the transition portion of the winding 1208 unwound between the intermediate portion 1260 and the distal portion 1202 can be between 0.1 and 0.25 mm and / or between 0.25 and 0.7 mm and / or between 0.7 and 1.0 mm. Optionally, the length 1276 of the transition portion can be between 0.1 mm and 0.4 mm and / or between 0.4 mm and 0.8 mm and / or between 0.8 mm and 1.6 mm and / or between 1.6 mm and 3.2 mm. Optionally, the winding 1208 is identical in the fully wound portion (e.g., the intermediate portion 1260) and the transition portion.

[0171] In some embodiments, the length 1278 of the distal portion 1202 may be between 0.1 mm and 0.4 mm and / or between 0.4 mm and 0.8 mm and / or between 0.8 mm and 1.6 mm and / or between 1.6 mm and 3.2 mm and / or between 3.2 mm and 7 mm and / or between 7 mm and 10 mm and / or between 10 mm and 20 mm.

[0172] In some embodiments, the intermediate portion 1260 and / or the distal portion 1202 may be curved and / or flexible and / or wavy. Optionally, the exterior of the tool (e.g., the helical winding 1208) may be roughened (e.g., by means of, for example, Ti plasma spraying (TPS), dual acid etching (DAE), sandblasting and acid etching with large abrasive (SLA), anodizing (ANO), machining (MAC), silicon coating (Sc), sandblasting (Sb), metallic primer, coupling agent, fiber (Fb) application, and opacifier (O)). In some embodiments, materials may be used for roughening, such as silanes, metallic primers or adhesives (Visiobond [V], ceramic bond [PP], alloy primer [AP], Unibond sealant [US], ESPE-Sil [ES]) and / or opacifiers, such as Clearfil St opacifier (CstO), Sinfony (S), Miris (M), and / or EO-Cavex).

[0173] Figure 13 This is a schematic diagram of a dental pulp brush with a stretchable end according to an embodiment of the present invention; optionally, the width 1277 of the winding 1308 is the same in the fully wound portion (e.g., the intermediate portion 1260) and is greater than the width of the winding 1308 in the transition portion. For example, the winding may be stretchable (e.g., metal wire) that is stretched and / or narrowed and / or where it is unwound and / or near its distal end in the transition portion 1362. For example, the width 1374 of the transition portion 1362 may be less than the sum of the width 1279 of the core 1206 and the width of the winding 1308 in the intermediate portion 1260.

[0174] In some embodiments, winding 1308 can be configured to prevent unwinding. For example, winding 1308 can resist unwinding when the brush is rotating in the unwinding direction of the helical winding 1308. Optionally, the distal portion and / or distal end of winding 1308 can be thick enough to resist unwinding. In some embodiments, stretching winding 1308 and / or guiding the tip of winding 1308 in a selected direction different from the proximal portion of winding 1308 (e.g., unwinding the distal portion and / or guiding the distal tip parallel to core 1206) can facilitate narrowing of the distal portion of the file (e.g., the distal portion of winding 1308) while reducing the risk of damaging the passage.

[0175] In some embodiments, the brush and / or file may comprise a single winding 1308 wound around the core 1206. For example, the core 1206 may comprise multiple strands of cable. For example, the strands may all be twisted in the same direction as the outer winding 1308. Alternatively or additionally, the strands may all be twisted in the opposite direction to the outer winding 1308. Alternatively or additionally, the core 1206 may comprise untwisted strands and / or strands twisted in different directions.

[0176] Figure 14 This is a schematic diagram of an eccentric pulp brush according to an embodiment of the present invention. In some embodiments, the distal portion 1402 of the tool includes, for example, a brush for cleaning the tip portion of the channel. Optionally, the intermediate portion 1460 may be roughened and / or curved and / or flexible. For example, the rough portion of the intermediate portion 1460 may be configured to scrape the sides of the channel. For example, the intermediate portion 1460 and / or the distal portion 1402 may include curvature and / or eccentricity. For example, curvature and / or eccentricity and / or flexibility may cause the file and / or brush to agitate within the channel.

[0177] Figure 15 This is a schematic diagram of an eccentric pulp brush according to an embodiment of the present invention. In some embodiments, the distal portion 1502 of the tool includes, for example, a brush for cleaning the tip portion of the channel. Optionally, the intermediate portion 1560 may be roughened and / or curved and / or flexible. For example, the roughened portion of the intermediate portion 1560 may be configured to scrape the sides of the channel. For example, the intermediate portion 1560 and / or the distal portion 1502 may include multiple bends and / or may be undulating and / or eccentric. For example, the bend and / or eccentricity and / or flexibility may cause the file and / or brush to agitate within the channel.

[0178] Figure 16 A pulp brush in a simulated channel according to an embodiment of the invention is illustrated. In some embodiments, the curved pulp brush rotates within a channel 1680. Optionally, the brush includes rough edges. For example, the central portion 1560 of the brush may be surrounded by a helix 1608. The helix 1608 may optionally be roughened. Optionally, the brush is curved and / or flexible and / or eccentric to rotation, such that portions of the sidewalls of the brush rub against the walls of the channel 1680, thereby cleaning the channel. At the narrow apex of the channel, a narrow wick optionally exposed at the distal portion 1502 of the brush may enter and / or expand to clean the walls of the channel 1680 and / or generate motion in the fluid, thereby cleaning the channel.

[0179] Figure 17A schematic diagram of a dental pulp brush with a roughened edge according to an embodiment of the present invention is illustrated. For example, the outer edge may include the surface of the outer winding 1708 of the brush. Roughening can be achieved, for example, by Ti plasma spraying (TPS), dual acid etching (DAE), sandblasting and acid etching with large abrasive (SLA), anodizing (ANO), machining (MAC), silicon coating (Sc), sandblasting (Sb), metallic primer, coupling agent, fiber (Fb) application, and opacifier (O). In some embodiments, materials may be used for roughening, including, for example, silanes, metallic primers or adhesives (Visiobond [V], porcelain bond [PP], alloy primer [AP], Unibond sealant [US], ESPE-Sil [ES]) and / or opacifiers, such as ClearfilSt opacifier (CstO), Sinfony (S), Miris (M), and / or EO-Cavex). Optionally, the brush may be curved and / or eccentric. The distal end of the brush may be unevenly cut and / or cut using an abrasive cutter. Optionally, the distal portion 1762 of the helical winding may be spread out and / or parallel to the core 1206. Optionally, the distal portion of the helical winding may be sharpened and / or stretched and / or leave a portion identical to its intermediate portion. Figure 17 The brush sizes can be the same as those described in any other embodiments disclosed herein.

[0180] Figure 18This is a block diagram of an eccentric pulp file 1801 according to an embodiment of the present invention. In some embodiments, the file 1801 includes a proximal handle 1802 and a distal movable portion 1806. Optionally, the proximal handle 1802 is configured for rotation about an axis of rotation (e.g., the handle may include an accessory configured to engage with and / or be rotated by a dental handpiece about an axis of rotation, for example, the axis of rotation may be a wholly or partially symmetrical axis of the handle). Optionally, the distal movable portion 1806 of the file 1801 is eccentrically and / or asymmetrically mounted to the handle. For example, the local center of mass of the distal movable portion 1806 may be displaced from the center of rotation of the handle. For example, the local center of mass of the distal movable portion 1806 may be not coincident with the axis of rotation of the handle and / or may be entirely on one side of the axis of rotation of the handle. For example, the average center of mass of the distal movable portion 1806 may be offset from the axis of rotation of the handle by a distance between the radius of the handle and twice the radius of the handle, and / or more than twice the radius of the handle, and / or between half the radius of the handle and the radius of the handle. In some embodiments, the flexible movable portion 1806, away from the transition portion 1804, is substantially parallel to the axis of rotation of the handle 1802 in a stress-free state. For example, the distance between the axis of rotation and the local center of mass of the flexible movable portion 1806, away from the transition portion 1804, may be approximately fixed along the length of the flexible movable portion 1806, for example, from the transition portion 1804 to the distal tip of the file 1801 and / or to the vicinity of the distal tip.

[0181] In some embodiments, file 1801 may include a transition portion 1804. For example, along the transition portion, the distance of the local center of gravity of the file from the axis of rotation of the handle may increase. Optionally, the transition region 1804 is less flexible than the distal active region 1806. Optionally, the transition region 1804 is more flexible than the proximal handle 1802. In some embodiments, the transition portion 1804 is part of the active region of file 1801 (e.g., the active region may be made of flexible lines and / or include a rough coating for cleaning tubes). Alternatively or additionally, the transition portion is part of the handle (e.g., the handle may be made of plastic and / or hard metal).

[0182] In some embodiments, the handle 1802 may include a friction accessory and / or a locking accessory. For example, the locking accessory may include a D-ring. Optionally, the handle may be made of plastic and / or metal. In some embodiments, the handle may include a torque limiter. For example, the friction accessory may slide between the dental handpiece and / or the file under high torque (e.g., for torques greater than 30 g / (cm N) and / or greater than 100 g / (cm N) and / or greater than 5 g / (cm N)). Alternatively or additionally, the handle may include a locking accessory that transmits high torque between the dental handpiece and the file.

[0183] Figure 19 This is a flowchart illustrating the cleaning of a pulp canal according to an embodiment of the present invention. In some embodiments, an eccentric pulp file 1901 may be supplied (e.g., the file may include any of the embodiments described herein). Optionally, the proximal handle of the file is attached 1902 to a rotational source (e.g., a dental handpiece). In some embodiments, the flexible distal portion of the file is inserted 1906 into the canal to be cleaned. Optionally, the handle is rotated 1903 about its axis of rotation (e.g., by a dental handpiece). For example, the rotation 1903 of the file may be initiated after the distal tip 1906 has been inserted into the canal. The rotation 1903 of the handle may optionally cause a rotational agitation 1908 movement of the flexible portion of the file remote from the handle. For example, the agitation 1908 movement may occur on the transition portion of the file and / or a portion of the flexible distal portion. Optionally, the agitation 1908 movement may occur on a portion of the file within the canal. Alternatively or additionally, a portion of the flexible distal portion of the file (e.g., the middle portion of the flexible distal portion and / or its distal tip) may whip 1908 within the canal. Alternatively, the agitation motion can cause the active, flexible portion of the file inside the tube to clean the tube and / or contact the tube wall over a larger area than a simple rotational motion. For example, the agitation flexible portion can agitate over an entire area larger than a portion of the file itself.

[0184] In some embodiments, the file will include, for example, a brush at its distal end. Optionally, rotation of the file 1903 will open the brush. For example, the brush can be inserted into the distal (e.g., tip) portion of the tube 1906 and / or rotated 1903 and / or opened. Optionally, the brush can clean the tip portion of the tube. For example, cleaning can include scraping, turbulence, and / or chemical activation. Optionally, the brush 1906 can be inserted without rotating 1903 and / or while rotating in the winding direction and / or while rotating in the unwinding direction.

[0185] Figure 20This is a block diagram of a kit 2001 including an eccentric pulp file according to an embodiment of the present invention. Optionally, the file may include an eccentric pulp file, such as those described in any of the embodiments herein. For example, the file may include a handle 2002 and / or a transition portion 2004 (optionally remote from the handle) and / or a movable portion 2006 (optionally remote from the transition portion). Optionally, the eccentric file is supplied and / or packaged in a non-stressed state. Optionally, the center of gravity of the movable portion 2006 is not on the axis of rotation of the handle 2002. Optionally, the file is packaged in a package 2010 (e.g., a box and / or a tray and / or a bottle and / or an envelope) for distribution (e.g., for sale). Alternatively or additionally, the file is packaged for sterility. For example, the file may be packaged in a sterile package 2010. For example, the sterile package may include a microbial barrier (e.g., according to standards such as the Society for Surgical Technology, ANSI / AAMI Advanced Medical Devices standards), such as textile materials, rigid containers, or paper-plastic peel packaging. For example, aseptic packaging can withstand heat sterilization and / or allow gas permeation for EtO and / or gas and / or plasma sterilization. Optionally, packaging 2010 may include a tray. In some embodiments, the kit may include files and / or sterilization materials and / or packaging. For example, packaging may include glass, paper, plastic, and / or metal containers. For example, packaging may include fibrous materials, films, foils, and / or laminates. In some embodiments, packaging may be closed and / or sealed. For example, seals may include gaskets and / or filters and / or adhesives and / or heat seals.

[0186] Figure 21 This is a flowchart illustrating the preparation of a kit comprising an eccentric pulp file according to an embodiment of the present invention. For example, an eccentric file 2101 (e.g., according to any embodiment herein) may be provided for packaging. Optionally, the file 2101 is provided in a stress-free state and / or a sterile state and / or a clean state. Optionally, the file is sterilized 2112 and / or packaged 2110. In some embodiments, the file may be sterilized 2112 and then packaged 2110 (e.g., autoclaved and then placed in a clean access tray in a clean room). Alternatively or additionally, the file may be packaged 2110 and then sterilized 2112 (e.g., using sterilization packaging and techniques as listed herein). In some embodiments, the packaging may be closed. For example, closure may include sealed packaging. The seal may be a seal and / or may include a bacterial barrier and / or a filter. Optionally, the seal may include curling, screwing on a cap, gluing, heat sealing, folding, coating, and / or shrink sealing.

[0187] Figure 22 is a schematic diagram of an eccentric pulp file 2201 according to an embodiment of the present invention, and Figure 23 is a schematic diagram of a portion and average center of gravity of an eccentric pulp file according to an embodiment of the present invention. The file of Figure 22 may include files as described in other embodiments herein. Optionally, the file 2201 includes a proximal handle 2202 having a rotation axis 2218. Optionally, the file includes a movable portion 2207, which may include a central core 2211 and / or one or more helices 2213 enclosing the central core. Optionally, the central core includes wire and / or cable, for example, composed of multiple strands. In some embodiments, the movable portion 2207 may include a transition region 2204 and / or an eccentric distal movable portion 2206. Alternatively or additionally, the transition region may include a portion of the handle (e.g., the movable region may be eccentrically mounted to the handle relative to the axis of rotation of the handle, for example, at an angle to and / or translated away from the axis of rotation).

[0188] In some embodiments, the handle 2202 may have a width (e.g., diameter 2216d) between 1.3 and 2.9 mm and / or between 2.9 and 3.2 mm and / or between 3.2 and 3.5 mm and / or greater than 3.5 mm. For example, the handle 2202 may mate with a 2 mm friction fitting and / or a 3.35 mm friction fitting. For example, the handle 2202 may have a length 2216a of 5 to 9 mm and / or 2 to 5 mm and / or 9 to 15 mm. Optionally, the handle 2202 may have a rotation axis 2218. For example, the rotation axis 2218 may pass through the handle's center of mass and / or center of gravity 2224. For example, the rotation axis 2218 may correspond to a local center of mass 2222 of the handle 2202 along its length. Optionally, in its unstressed shape, the distal movable portion 2206 is generally straight. Alternatively or additionally, in its unstressed shape, the distal active portion 2206 may have a uniform second moment (e.g., it bends along its length in the same direction).

[0189] In some embodiments, the concentric portion 2209 of the movable portion 2207 of the file 2201 may be concentric with the axis of rotation of the handle 2202. For example, the concentric portion 2209 may be located between the transition zone 2204 and the handle 2202. Alternatively, the transition zone may be directly connected to and / or include a portion of the handle 2202. In some embodiments, the local centroid 2222 of the file may become more distant from the axis of rotation 2218 of the handle 2202 as it moves distally along the transition zone 2204. For example, the transition zone may have a length 2216b in the range of 1 to 2 mm and / or 2 to 6 mm and / or 6 to 12 mm and / or 12 to 25 mm. Optionally, the lateral displacement 2216e between the proximal starting end and the distal end of the transition zone 2204 may be in the range of 0 to 1.5 mm and / or 1.5 to 2.2 mm and / or 2.2 mm to 4 mm and / or 4 to 10 mm.

[0190] In some embodiments, the distal active region 2206 is located distal to the transition region 2204. For example, the distal active region 2206 can be connected to the handle via the transition region 2204. Optionally, when the file 2201 is not under stress, the distal active region 2206 is generally parallel to the rotation axis 2218 of the handle. Alternatively or additionally, when the file 2201 is not under stress, the distal active region 2206 may be angled and / or bent relative to the rotation axis 2218 of the handle. In some embodiments, the distal active region 2206 may be entirely on one side of the rotation axis 2218. Optionally, the length of the distal active portion 2216f may be between 15 and 20 mm and / or between 5 and 15 mm and / or between 20 and 30 mm.

[0191] In some embodiments, the distance from the center of mass 2227 of file 2201 to the axis of rotation 2218 of handle 2202 is greater than the radius of the handle 2202. Alternatively or additionally, the distance from the center of mass 2227 of file 2201 to the axis of rotation 2218 of handle 2202 may be less than the radius of handle 2202 (e.g., between half the radius and the radius). In some embodiments, the distance from the center of mass 2225 of the distal movable portion 2206 of file 2201 to the axis of rotation 2218 of handle 2202 is greater than the radius of handle 2202. Alternatively or additionally, the distance from the center of mass 2225 of the distal movable portion 2206 of file 2201 to the axis of rotation 2218 of handle 2202 may be less than the radius of handle 2202 (e.g., between half the radius and the radius). In some embodiments, the center of mass 2227 of file 2201 is closer to the axis of rotation of file handle 2202 than the center of mass 2225 of distal movable portion 2206. In some embodiments, the center of mass 2227 of file 2201 is closer to the axis of rotation of file handle 2202 than a local center of mass 2222 of file along distal movable portion 2206 (e.g., distal end of transition portion 2204 of file). Optionally, the entire length 2216c of file may be between 30 and 34 mm and / or between 20 and 30 mm and / or between 34 and 45 mm.

[0192] In some embodiments, the distal movable portion 2206 may be thinner and / or more flexible than some or all of the adjacent portions of the file (e.g., transition portion 2204 and / or concentric portion 2209 and / or handle 2202). Optionally, the distal movable portion 306 is tapered. For example, the distal movable portion may terminate at a tapered tip.

[0193] In some embodiments, the core 2211 may protrude from one or more helices 2213. For example, the core 2211 may be exposed at its distal end. The core 2211 may include, for example, a multi-strand cable that leads to a brush at the distal end of the device as the device rotates in a particular direction. For example, a file may be inserted while rotating in a first direction, and / or the direction of rotation may be reversed to open strands at the distal end of the file to form the sides of the brush and / or cleaning tube. Contact with the wall of the tube may further open the strands. Optionally, the distal portion of the file may have a very small diameter and / or be flexible enough to access a very small tip portion of the tube. Rotating the brush may optionally activate disinfectant chemicals. Optionally, rotation of the brush may drive a fluid (e.g., a disinfectant) into a small orifice (e.g., by generating turbulence, centrifugal force, and / or by cleaning a membrane blocking the orifice).

[0194] Figure 24This is a schematic diagram of the stirring motion of an eccentric pulp file according to an embodiment of the present invention. In some embodiments, the axis of rotation 2418 of the file 2401 does not correspond to the axis of symmetry of the active portion of the file 2401 (e.g., the transition region 2404 and / or the distal active region 2406). In some embodiments, as the file 2401 rotates 2430 about the axis of rotation 2418 of its handle 2402, centrifugal force optionally presses outward (e.g., away from the axis of rotation 2418) against the distal active region 2406. Optionally, stirring and / or spreading are distributed along the entire length of the transition region 2404 and / or the distal active region 2406 of the file 2401. For example, the distal portion of the file 2401 can be stirred and / or spread in various locations as the transition region 2404 rotates between relative positions 2404, 2404' and / or the distal active region 2406 rotates between relative positions 2406, 2406'. For example, when the distal portion of file 2401 is inside the tube, the distal tip can agitate and / or contact and / or clean the sides of the tube around the large space within the tube boundary. This agitation motion may clean corners and / or hard-to-reach locations inside the tube. The agitation motion can also agitate the cleaning fluids within the tube to activate them and / or mix them more deeply into the tube, for example, for cleaning and / or sterilizing channels. In some embodiments, if file is used, the transition portion 2304 is directly attached to the handle 2402.

[0195] Figure 25A This is a schematic diagram of an eccentric pulp file that is shallowly inserted into a tube according to an embodiment of the present invention, and Figure 25B This is a schematic diagram of an eccentric pulp file 2201 deeply inserted into a tube 2534 of a tooth and rotated by a dental handpiece 2532 according to an embodiment of the invention. In some embodiments, the agitating action of the file 2201 adjusts itself to the space and / or geometry within the tube. For example, as the file 2201 is inserted into the tube, the adjacent active portion of the tube, such as the transition portion 2204, agitates in various directions and / or causes the more distal portion to rub against the edge of the large opening of the tube. Agitation of the transition portion 604 outside the tube may also result in agitation of the distal portion inside the tube. The agitation may also affect all portions of the distal active portion of the file 2201 in a similar manner. For example, this may cause the file 2201 to contact the wall entirely along its distal active portion. In some embodiments, curvature and / or flexibility and / or bending forces cause the volume of each portion of the file to expand (e.g., when the file is elastically bent) to fill the tube and / or scrape the edge around the tube.

[0196] Figure 26A is a low-magnification image of an eccentric pulp file 2201 according to an embodiment of the present invention, and Figure 26B is a medium-magnification image of an eccentric pulp file 2201 according to an embodiment of the present invention, and Figure 26C is a high-magnification image of section B of the eccentric pulp file after use according to an embodiment of the present invention (indicated by Figures 26A and 26B). It can be seen that the agitation of the file results in approximately uniform wear of the abrasive surface of the file. For example, the movement of the file may cause agitation and / or unfolding and / or contact with the surface of the tube, which is along the moving portion of the file. For example, when the axis of rotation of the file 2201 does not correspond to the center of mass of the moving portion of the file, centrifugal force can push the moving portion against the wall of the tube, which is along the length of the tube. For example, the center of mass of the distal moving portion of the file 2201 may travel approximately parallel to the axis of rotation. Optionally, centrifugal motion and / or agitation generate centrifugal force between the moving portion of the file and the wall of the tube. Optionally, this force is distributed along the distal moving portion of the file. For example, the rotational speed of the eccentric file can be between 4000 and 5500 RPM and / or between 5500 and 7500 RPM and / or between 7500 and 9500 RPM. Optionally, the file 2201 resists material fatigue and / or stress concentration (e.g., due to its flexibility and / or elasticity, even its contact with the tube and / or the approximately constant distance between the unstressed moving portion of the file and the axis of rotation). In some embodiments, the moving area of ​​the file 2201 is designed with a flexible helical shape under stress to balance pressure and facilitate movement of the structure on the file. For example, dynamic loading, bending, elastic buckling, and / or buckling of the file can cause different portions of the file to contact the wall of the tube at different times. This can promote a more even distribution of stress throughout.

[0197] Figure 27AThis is a highly enlarged schematic diagram of a longitudinal cross-section (section A of FIG. 22) of an eccentric pulp file according to an embodiment of the present invention. In some embodiments, the structure of the movable portion of the file may include a central core 2714 (e.g., the diameter of the core may be, for example, between 0.05 and 0.2 mm and / or between 0.01 and 0.05 mm and / or between 0.2 and 0.4 mm). Optionally, the core 2714 may include a single thread and / or multiple strands. For example, the diameter of each strand may be between 0.01 and 0.05 mm and / or between 0.05 and 0.1 mm and / or between 0.1 and 0.2 mm. Optionally, the strands are twisted together. For example, the strands may be twisted in the opposite direction to helices 2744 and / or 2746. Alternatively or additionally, the strands may be wound in the same direction as helices 2744 and / or 2746. Optionally, a medium-diameter wire 2744 (e.g., with a diameter ranging from 0.05 to 0.1 mm and / or from 0.1 to 0.25 mm and / or from 0.25 to 0.5 mm) is tightly wrapped around a core 2714 (e.g., the distance 2716a between windings can be between 100% and 110% and / or between 110% and 130% and / or between 130% and 150% and / or in the range of 150% to 200%). Optionally, a thicker diameter wire 2746 (e.g., with a diameter ranging from 0.1 to 0.2 mm and / or from 0.2 to 0.5 mm and / or from 0.5 to 1 mm) is loosely wrapped around a medium diameter wire 2744 (e.g., the distance 2716b between the windings can be between 120% and 150% and / or 150% to 200% and / or 200% to 400% and / or 400% to 900% of the diameter of the thicker wire 2746). Optionally, near the tip of the file, the core 2714 and / or the wires 2744 and 2746 may be tapered. Alternatively or additionally, near the distal end of the file, the thicker wire 2746 may be missing and / or the medium diameter wire may be missing. Optionally, one or all of the core 2714 and / or outer lines (e.g., lines 2746 and / or lines 2744 and / or core 2714 in section A) near the tip may be processed to have a surface roughness (e.g., as shown in Figure 26C). Optionally, at the tip, the strands of the core 2714 may be free (e.g., to form a brush) and / or fused (e.g., to form a file).

[0198] Figure 27BThis is a highly enlarged schematic diagram of a longitudinal view of an eccentric pulp file with a two-layer structure according to an embodiment of the present invention. Any embodiment of the file and / or brush described herein may be made of a two-layer and / or three-layer structure. In some embodiments, the structure of the moving portion of the file may include a central core 2742 (e.g., the diameter 2743 of core 2742 may be, for example, between 0.1 and 0.3 mm and / or between 0.01 and 0.1 mm and / or between 0.3 and 0.5 mm). Optionally, the core may include a single strand and / or multiple strands. For example, core 2742 may include 4-10 strands and / or 1-4 strands and / or 10-30 strands. For example, the diameter of each strand may be between 0.03 and 0.1 mm and / or between 0.1 and 0.2 mm and / or between 0.01 and 0.03 mm. Optionally, the strands are twisted together. For example, the strands may be twisted in the opposite direction to the helix 2747. Alternatively or additionally, the strands may be wound in the same direction as the helix 2747. Optionally, the diameter of the helix 2747 wrapped around the core 2742 may, for example, be in the range of 0.05 to 0.1 mm and / or 0.1 to 0.25 mm and / or 0.25 to 0.5 mm and / or 0.5 to 1.0 mm (e.g., the distance between windings 2747 may be in the range of 100% to 110% and / or 110% to 130% and / or 130% to 150% and / or 150% to 200% and / or 200% to 400% and / or 400% to 900% of the diameter of the wire 1047). Optionally, the core 2742 and / or wire 2747 may be tapered near the tip of the file. Alternatively or additionally, the helix 2747 may be absent near the distal end of the file. Optionally, one or both of the core 2742 and / or the spiral 2747 near the tip may be processed to have a surface roughness (e.g., as shown in Figure 26C). Optionally, at the tip, the strands of the core 2742 may be free (e.g., to form a brush) and / or fused (e.g., to form a file).

[0199] Figure 28A This is a schematic diagram of a wavy file with a brush tip according to an embodiment of the present invention.

[0200] In some embodiments, the file includes strands 2811 of a brush used as a cleaner and / or agitator for fluid in the tube. For example, the core of the file may include a multi-stranded cable. Optionally, the core is surrounded by one or more helical lines 2804 on the body 2807 of the file. In some embodiments, the core and / or helical lines 2804 may be wound in the same direction. Rotating the file in one direction can wind the helical lines 2804 and / or tighten the winding of the core. This can facilitate the file's penetration into the tube. Optionally, rotating the file in the opposite direction can open the strands 2811 and / or unfold the helical lines 2804. For example, opening the strands 2811 can form a brush to clean structures (e.g., narrow channels and / or orifices) in the tip portion of the tube. Opening the helical lines 2804 can enhance scraping against the walls of the proximal portion of the tube. Alternatively or additionally, rotating the brush may optionally break up debris and / or residue in the tube and / or scrub the walls of the tube. Optionally, the file may have a multi-strand structure that enables it to resist stress and / or facilitate high-speed rotation when cleaning the tube. For example, the file structure may refer to... Figure 5 Figures 26A to 26C and / or Figure 10 As described above. Optionally, the file may include a proximal adapter 2802 adapted to a dental handpiece. For example, the handpiece may rotate the file at a rate between 5500 and 7500 RPM and / or between 3000 and 5500 RPM and / or between 2000 and 5500 RPM and / or between 7500 and 11000 RPM.

[0201] In some implementations, a single file and / or a pair of files can be used to clean the entire root canal. For example, the file may include a distal strand 2811 that forms a brush to clean the tip portion of the tube. The strand 2811 may optionally simultaneously clean the walls of the tube and / or activate fluid within the tube. For example, the spun strand 2811 may generate turbulent forces that push liquids (e.g., disinfectants) across the tube and / or against the sides of the tube. Additionally or alternatively, the strand 2811 scrapes and / or removes biofilms and / or other coatings that shield infected organisms from disinfectant attack. Optionally, this cleaning may facilitate disinfectant penetration of the biofilm and / or elimination of bacteria.

[0202] In some embodiments, the body 2807 of the file can clean the exterior of the tube. For example, the file can be highly flexible, allowing it to agitate and / or bend and / or fold throughout the tube, thereby filling spaces and / or scraping the tube walls and / or activating disinfectant within the tube. Optionally, a rotating helical winding on the file can expel debris from the tube. Optionally, external cleaning can be performed simultaneously with cleaning of the top portion. Optionally, the file can have an eccentric configuration, such as that shown in Figure 22. An eccentric configuration may be advantageous, for example, for generating agitating motions to clean large opening areas near the tube inlet. Alternatively or additionally, the file can have a serpentine geometry (e.g., as shown in Figure 22). Figure 28A(As shown). For example, a serpentine configuration can include curvature along the entire and / or most of the file's length (e.g., in a stationary state, the file may bend by more than 10% and / or between 10% and 25% and / or between 25% and 50% and / or between 50% and 75% and / or between 5% and 10% and / or between 2% and 5%). The serpentine geometry can facilitate resilient buckling of the file under axial pressure (e.g., when a dentist pushes the file into the channel). The file's resilience and / or buckling can cushion axial forces that limit the force on the distal end of the file (e.g., preventing the distal end of the file from being pushed out of the tube into sensitive tissue around the tooth). Buckling along all portions of the file can optionally push the file outward along its length, thereby filling the sides of the tube. This is particularly useful when cleaning the middle portion of the tube (e.g., between the tip and outer portions). Optionally, the resilient bending structure of the serpentine file also redistributes forces, such that the high localized lateral forces generated at locations where a portion is pressed against the wall are distributed along the file, thereby causing buckling at another location, thus suppressing very high concentrations of localized forces that could damage and / or rupture the tube wall. Optionally, the radius of curvature of the bent portion of the file body when at rest can be in the range of 1 to 3 mm and / or 3 to 10 mm and / or 10 to 30 mm and / or 30 to 50 mm and / or 50 to 100 mm and / or 100 to 300 mm. Optionally, the file can be sufficiently flexible to resiliently buckle to a radius of curvature in the range of 0.2 to 1 mm and / or 1 to 2 mm and / or 2 to 4 mm and / or 4 to 8 mm and / or 8 to 16 mm. In some embodiments, the wavy file with a brush tip will have a 3-layer structure (e.g., as shown in the image). Figure 27A (As shown). Alternatively or additionally, a wavy file with a brush tip can have a two-layer structure (e.g., as shown). Figure 27B (As shown).

[0203] Figure 28B This is a schematic diagram of a pulp brush according to an embodiment of the present invention. Optionally, the file includes a closed tip (e.g., instead of a brush). In some embodiments, the wavy file will have a 3-layer structure (e.g., as shown in the diagram). Figure 27A (As shown). Alternatively or additionally, the corrugated file may have a two-layer structure (e.g., as shown). Figure 27B (As shown).

[0204] In some embodiments, the file tip is a closed file 281G for penetrating and / or cleaning a tube. For example, the core of the file may include a multi-stranded cable. Optionally, on the body 2807 of the file, the core is surrounded by one or more helices 2804. In some embodiments, the core and / or the helices 2804 may be wound in the same direction. Rotating the file in one direction can wind the helices 2804 and / or tighten the winding of the core. This can facilitate the file's penetration into the tube. Optionally, the file may have a multi-stranded structure that allows it to resist stress and / or facilitate high-speed rotation when cleaning the tube. For example, the file structure may be as described above herein with reference to Figures 22, 26A through 26C, and / or Figure 27. Optionally, the file may include a proximal adapter 2802 adapted to a dental handpiece. For example, the handheld device can rotate the file at a rate between 5500 and 7500 RPM and / or between 3000 and 5500 RPM and / or between 2000 and 5500 RPM and / or between 7500 and 11000 RPM.

[0205] In some embodiments, the body 2807 of the file can clean the exterior of the tube. For example, the file can be highly flexible, allowing it to agitate and / or bend and / or fold throughout the tube, thereby filling spaces and / or scraping the tube walls and / or activating disinfectant within the tube. Optionally, a rotating helical winding on the file can expel debris from the tube. Optionally, external cleaning can be performed simultaneously with cleaning of the top portion. Optionally, the file can have an eccentric configuration, such as that shown in Figure 22. An eccentric configuration may be advantageous, for example, for generating agitating motions to clean large opening areas near the tube inlet. Alternatively or additionally, the file can have a serpentine geometry (e.g., as shown in Figure 22). Figure 28A(As shown). For example, a serpentine configuration can include curvature along the entire and / or most of the file's length (e.g., in a stationary state, the file may bend by more than 10% and / or between 10% and 25% and / or between 25% and 50% and / or between 50% and 75% and / or between 5% and 10% and / or between 2% and 5%). The serpentine geometry can facilitate resilient buckling of the file under axial pressure (e.g., when a dentist pushes the file into the channel). The file's resilience and / or buckling can cushion axial forces that limit the force on the distal end of the file (e.g., preventing the distal end of the file from being pushed out of the tube into sensitive tissue around the tooth). Buckling along all portions of the file can optionally push the file outward along its length, thereby filling the sides of the tube. This is particularly useful when cleaning the middle portion of the tube (e.g., between the tip and outer portions). Optionally, the resilient bending structure of the serpentine file also redistributes forces, causing high localized lateral forces generated at locations where a portion is pressed against the wall to be distributed along the file, thereby inducing buckling at another location and suppressing very highly concentrated localized forces that could damage and / or rupture the tube wall. Optionally, the radius of curvature of the bent portion of the file body at rest can be between 1 and 3 mm and / or between 3 and 10 mm and / or between 10 and 30 mm and / or between 30 and 50 mm and / or between 50 and 100 mm and / or between 100 and 300 mm. Optionally, the file can be sufficiently flexible to resiliently buckle to a radius of curvature between 0.2 and 1 mm and / or between 1 and 2 mm and / or between 2 and 4 mm and / or between 4 and 8 mm and / or between 8 and 16 mm.

[0206] Figure 29 This is a block diagram of a curved file according to an embodiment of the present invention. In some embodiments, the pulp file includes, for example, a proximal handle 2902 configured to engage with a dental handpiece. Optionally, the file includes a curved body 2904. For example, the curvature of the body 2904 may be serpentine and / or eccentric. Optionally, the body may include a core and / or a helical winding, as shown in previous embodiments herein. For example, the core may include multi-strand cable and / or the helical winding may enclose the core and / or may include wire and / or may include a rough coating. Optionally, the distal portion of the file may be configured to form a brush 2911. For example, the brush 2911 may be formed from the distal portion of a core cable extending distally through the helical winding.

[0207] Figure 30This is a flowchart illustrating a method for cleaning a tube according to an embodiment of the present invention. In some embodiments, a flexible, curved file (e.g., as described in previous embodiments) may be supplied (3001). The handle of the file is optionally attached (3002) to a dental handpiece. The distal brush of the file may be inserted into the tip portion of the tube (3006). Optionally, rotating the handle and / or the file via the handpiece (3003) and / or rotating the file may simultaneously clean the tip portion and / or the middle and / or outer portions of the tube. For example, the brush of the file may open at the tip portion, scraping the tube wall and / or inducing turbulence in the disinfectant fluid. For example, the curved body of the file may agitate and / or bend at various points inside the outer portion of the tube, thereby scraping the tube wall and / or inducing turbulence in the disinfectant fluid. For example, the file (3006) may be inserted while rotating in a first direction and / or the direction of rotation may be reversed to open the strand at the distal end of the file to form a brush and / or clean the sides of the tube (3008). Optionally, an axial force may be applied to bend the file and clean the outer sides of the tube (3008).

[0208] Figure 31 This is a flowchart illustrating a two-step method for cleaning a tube according to an embodiment of the present invention. In some embodiments, an eccentric file (e.g., as described in previous embodiments) may be used for coarse cleaning 3108 of the tube; for example, the eccentricity of the file may allow for enhanced agitation and / or cleaning of 3108 in the large opening on the exterior of the tube. Optionally, the eccentric file may include a brush to clean the tip portion of the tube 3108. Optionally, the exterior portion and / or tip portion may be cleaned simultaneously. Optionally, a snake-patterned file (e.g., as described in previous embodiments) may be used for further cleaning 3109 of the tube. For example, the flexible, bent portion of the snake-patterned file is advantageous for cleaning the middle portion of the tube 3109 (between the exterior and tip portions). Optionally, the snake-patterned file may include a brush to clean the tip portion of the tube 3109. Optionally, the middle portion and / or tip portion of 3109 may be cleaned simultaneously.

[0209] Figure 32The illustration depicts a method for cleaning a tube according to an embodiment of the invention. The inventors have observed that, in some cases, reversal can lead to damage to the tube. For example, rotating the outer winding against the winding direction of the outer winding can sometimes cause the hard wires of the outer winding to protrude and / or damage the tube. In some embodiments, a brush and / or file can be used without reversal. For example, the brush can be inserted without rotation at 3206. Optionally, once the file is in place with the brush in the tip portion of the tube, the brush can be rotated in the opposite direction to the winding at 3203. For example, the brush can be twisted in the opposite direction to the twist of the outer winding. Alternatively or additionally, the brush can be twisted in a direction similar to the twist of the outer winding. For example, this can open the brush to clean the tip portion of the tube without opening the outer winding. Optionally, the sides of the outer winding can be roughened and / or the tool can be eccentric and / or bent, for example, to clean the walls of the proximal portion of the tube. For example, the sides of the brush and / or the outer winding can clean the tube during rotation and / or retraction from the tube at 3205.

[0210] Figure 33 The illustration depicts a method for cleaning a tube according to an embodiment of the invention. For example, brush 3306 can be inserted while rotating 3303 in the direction opposite to the winding of the brush. Alternatively or additionally, the brush can be twisted in a direction similar to the twist of the outer winding. For example, the brush can be twisted in the direction opposite to the twist of the outer winding. In some embodiments, the brush and / or file can be used without reversing the direction. For example, the brush can be flexible enough to access the tip portion of the tube even when opening and / or rotating brush 3306 to twist it in the opposite direction. For example, the brush can be twisted in the direction opposite to the twist of the outer winding. For example, this can open the brush to clean the tip portion of the tube without opening the outer winding. Optionally, the sides of the outer winding can be roughened and / or the tool can be eccentric and / or bent, for example, to clean the walls of the proximal portion of the tube. For example, the sides of the brush and / or the outer winding can clean the tube during rotation 3303 and / or during retraction from the tube 3205 and / or during insertion of 3306 into the tube.

[0211] Figure 34 The illustration depicts a method of manufacturing a dental pulp brush and / or file according to an embodiment of the invention. For example, the core may be supplied 3408 and / or twisted in a twist direction (optionally, the core may comprise a cable with strands twisted entirely in a single direction and / or a composite cable with strands twisted in different directions, e.g., the twist direction of the core is the twist direction of the innermost twisted strand). Optionally, an outer winding will be wound around the core 3409 along the same twist direction of the core.

[0212] Figure 35The illustration depicts a method of manufacturing a dental pulp brush and / or file according to an embodiment of the invention. For example, the core may be supplied and / or twisted in a twist direction (optionally, the core may comprise a cable with strands twisted entirely in a single direction and / or a composite cable with strands twisted in different directions, e.g., the twist direction of the core is the twist direction of the innermost twisted strand). Optionally, an outer winding will be wound around the core 3509 in a direction opposite to the twist direction of the core.

[0213] It is anticipated that many related technologies will be developed during the lifetime of the patent that matures from this application, and the scope of terminology for design elements, analysis routines, and user equipment is intended to include all such new technologies prior to this application.

[0214] Unless otherwise defined, all technical and / or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art in the field to which this invention pertains. Although similar or equivalent methods and materials to those described herein may be used in the practice or testing of embodiments of the invention,

[0215] Exemplary methods and / or materials are described below. In case of any discrepancy, the patent specification, including the definitions, shall prevail. Furthermore, these materials, methods, and examples are illustrative only and do not constitute any necessary limitation.

[0216] The term "approximately" as used in this article refers to ±10%.

[0217] The terms “including,” “contains,” “includes,” “encompasses,” “has,” and similar terms mean “including but not limited to.”

[0218] The term "composed of" means "including and limited to".

[0219] The term "consistently of" means that a composition, method, or structure may include additional components, steps, and / or portions, but such additional components, steps, and / or portions may be included only if they do not substantially alter the essential and novel characteristics of the claimed composition, method, or structure.

[0220] The singular forms “a,” “one,” and “the” used in this article include plurals unless the context clearly indicates otherwise.

[0221] Throughout this application, various embodiments of the invention may be presented in a scope format. It should be understood that the scope format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the invention. Therefore, a description of a scope should be considered as specifically disclosing all possible sub-scopes and individual values ​​within that scope. For example, a description of a scope such as 1 to 6 should be considered as specifically disclosing sub-scopes such as 1 to 3, 1 to 4, 1 to 5, 2 to 4, 2 to 6, 3 to 6, etc., and the number of individuals within that scope, such as 1, 2, 3, 4, 5, and 6. This applies regardless of the breadth of the scope.

[0222] Whenever a range of numbers is indicated in this document, that range refers to any referenced number (fraction or integer) within the indicated range. The phrases “from…to / range between…” between the first and second indicated numbers and “from…to / range between…” between “the first indicated number” and “the second indicated number” are used interchangeably here and mean to include the first and second indicated numbers and all decimal and integer numbers in between.

[0223] It should be understood that, for clarity, certain features of the invention described in the context of individual embodiments may also be provided in combination in a single embodiment. Conversely, for brevity, various features of the invention described in the context of individual embodiments may also be provided individually or in any suitable sub-combination, or as embodiments suitable for any other description of the invention. Certain features described in the context of various embodiments should not be considered essential features of those embodiments unless the embodiment is inoperable without these elements.

[0224] Although the invention has been described in conjunction with its specific embodiments, it will be apparent to those skilled in the art that many alternatives, modifications, and variations will be readily apparent. Therefore, it is intended to include all alternatives, modifications, and variations that fall within the spirit and broad scope of the appended claims.

[0225] All publications, patents, and patent applications mentioned in this specification are incorporated herein by reference in their entirety, to the same extent that each individual publication, patent, or patent application is specifically and individually indicated to be incorporated herein by reference. Furthermore, any reference or citation to this application should not be construed as an admission that the referenced material is prior art. In a sense, the use of subheadings in this application should not be construed as inherent limitation.

Claims

1. A pulp brush, comprising: A connector for attaching to a handheld device; A central longitudinal flexible core is supported at the proximal end of the handheld device by the connector; the tip of the central longitudinal flexible core is located at the end opposite to the connector, and the central longitudinal flexible core comprises multiple strands wound in the winding direction and not bonded, such that during use, when the pulp brush is rotated in the opposite direction to the winding direction, the strands unwind and open to form a brush at the tip; as well as A helix, at least partially surrounding the central longitudinal flexible core, the helix extending distally to the tip of the central longitudinal flexible core, wherein the tip of the central longitudinal flexible core protrudes distally from the helix. The winding on the distal portion of the helix is ​​looser than that on the middle portion, so that the direction of the distal tip of the helix is ​​oriented parallel to the central longitudinal flexible core.

2. The pulp brush according to claim 1, wherein, The multiple strands surround the internal central flexible cable.

3. The pulp brush according to claim 1, wherein, The distal portion of the spiral is stretched longitudinally and narrowed laterally.

4. The pulp brush according to claim 3, wherein, The middle part of the pulp brush is curved.

5. The pulp brush according to claim 1, wherein, The strand is wound in the opposite direction to the spiral, thereby rotating the brush in the winding direction of the spiral both tightens the spiral and unwinds the strand.

6. The pulp brush according to claim 1, wherein, The strand is wound in the same direction as the spiral, thereby rotating the brush along the winding direction of the spiral to tighten both the spiral and the strand.

7. The pulp brush according to claim 1, wherein, The tip is cut along a line at an angle between 10 and 80 degrees to the axis of the central longitudinal flexible core.

8. The pulp brush according to claim 1, wherein, The tip is cut along a line at an angle between 25 and 75 degrees to the axis of the central longitudinal flexible core.

9. The pulp brush according to claim 1, wherein, The tip is cut using an abrasive cutter.

10. The pulp brush according to claim 1, wherein, The tip is cut using a laser cutter.

11. The pulp brush according to claim 1, wherein, The tip is cut using an electrical discharge machining (EDM) cutter.

12. The pulp brush according to claim 1, wherein, The tip is cut along a line at an acute angle to the axis of the central longitudinal flexible core.

13. The pulp brush according to claim 1, wherein, The connector is configured to lock longitudinally to the handheld device, and the rotational connection between the connector and the handheld device is achieved by friction.

14. The pulp brush according to claim 1, wherein, The middle portion of the pulp brush includes a rough edge.

15. The pulp brush according to claim 1, wherein, The proximal portion of the central longitudinal flexible core is bent inside the connector.

16. A method for manufacturing a pulp brush, comprising: A connector for attaching to the handheld device is provided at the proximal end of the pulp brush; Multiple strands are wound along the winding direction to form a central longitudinal flexible core; The proximal end of the central longitudinal flexible core is supported at the end of the handheld device by the connector; the distal tip of the central longitudinal flexible core opposite to the end of the handheld device is not bonded, such that during use, when the brush is rotated in a direction opposite to the winding direction, the plurality of strands unwind and open to form a brush; The spiral is at least partially wound around the periphery of the central longitudinal flexible core and extends toward the tip of the central longitudinal flexible core in a direction opposite to the handle end, wherein the unbonded portion of the central longitudinal flexible core protrudes beyond the spiral at the tip, and wherein the winding on the distal portion of the spiral is looser than that on its middle portion, such that the direction of the distal tip of the spiral is oriented parallel to the central longitudinal flexible core.

17. The method of claim 16, wherein, The multiple strands surround the internal central flexible cable.

18. The method of claim 16, further comprising: The distal tip of the central longitudinal flexible core is cut unevenly.

19. The method according to claim 18, wherein, The cutting is performed along a line at an acute angle to the axis of the central longitudinal flexible core.

20. The method according to claim 18, wherein, The cutting is performed along a line at an angle between 10 and 80 degrees to the axis of the central longitudinal flexible core.

21. The method according to claim 18, wherein, The cutting is performed along a line at an angle between 25 and 75 degrees to the axis of the central longitudinal flexible core.

22. The method according to claim 18, wherein, The cutting is performed using an abrasive cutter.

23. The method according to claim 18, wherein, The cutting is performed using a laser cutter.

24. The method according to claim 18, wherein, The cutting is performed using an electrical discharge machining (EDM) cutter.

25. A pulp brush, comprising: A connector for attaching to a handheld device; A central longitudinal flexible core is supported at the proximal end of the handheld device via the connector; The distal tip of the central longitudinal flexible core comprises multiple strands wound in the winding direction and not bonded, such that during use, when the pulp brush is rotated in the opposite direction to the winding direction, the strands unwind and open to form a brush. A spiral, which at least partially surrounds the central longitudinal flexible core and extends distally to the tip of the central longitudinal flexible core opposite the end of the handle, wherein the tip of the central longitudinal flexible core protrudes beyond the spiral at the distal end, and wherein the surface of the spiral is roughened. as well as The winding on the distal portion of the helix is ​​looser than that on the middle portion, so that the direction of the distal tip of the helix is ​​oriented parallel to the central longitudinal flexible core.

26. The pulp brush according to claim 25, wherein, The distal portion of the spiral is stretched longitudinally and narrowed laterally.

27. The pulp brush according to claim 25, wherein, The winding on the distal portion of the helix is ​​oriented parallel to the central longitudinal flexible core.

28. The pulp brush according to claim 25, wherein, The middle part of the pulp brush is curved.

29. The pulp brush according to claim 25, wherein, The proximal portion of the central longitudinal flexible core is bent inside the connector.

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