JP2022173405A

JP2022173405A - Needle root canal instruments and dental instruments

Info

Publication number: JP2022173405A
Application number: JP2022154259A
Authority: JP
Inventors: 亘弘佐藤; Nobuhiro Sato
Original assignee: Juarjapan Co Ltd
Current assignee: Juarjapan Co Ltd
Priority date: 2019-02-19
Filing date: 2022-09-27
Publication date: 2022-11-18
Also published as: WO2020170999A1; WO2020170322A1; JPWO2020170999A1

Abstract

【課題】針状根管治療具をその長さ方向の往復移動で根管の拡大を行なうに適した形態にするとともに、針状根管治療具をその長さ方向に往復移動させることができる歯科治療器具を提供する。【解決手段】針状根管治療具１を保持部２と作業部３とからなるものとし、作業部３の芯体５に、治療具長さ方向の往復移動によって根管の拡大形成を行なったり綿材や充填剤の押し込みを行なうなどの歯科治療対象部位に対する処置を行なう処置部９を設けた。【選択図】図１[Problem] A needle-like root canal treatment tool can be made into a form suitable for enlarging a root canal by reciprocating movement in the length direction, and the needle-like root canal treatment tool can be moved back and forth in the length direction. Provides dental treatment equipment. [Solution] A needle-like root canal treatment instrument 1 is composed of a holding section 2 and a working section 3, and a root canal is enlarged and formed on a core body 5 of the working section 3 by reciprocating movement in the length direction of the treatment instrument. A treatment section 9 is provided for performing treatment on a site to be treated with dental treatment, such as injecting cotton material or filler. [Selection diagram] Figure 1

Description

本発明は、根管治療に用いる針状根管治療具とこの針状根管治療具を取り付けた歯科治療器具に関するものである。 TECHNICAL FIELD The present invention relates to a needle-like root canal treatment tool used for root canal treatment and a dental treatment instrument to which this needle-like root canal treatment tool is attached.

従来から齲蝕（うしょく）が歯髄まで及んだ虫歯の治療では、侵された神経や血管を含む組織である歯髄を抜き取った後に、その歯髄があった根管を内側から拡大し、ガッタバーチャ・ポイントなどを用いて薬剤による根管充填を行ない、さらに土台材を入れて補強を行ない、治療範囲が小さかった場合にはインレー（詰め物）を取り付けて、また治療範囲が大きかった場合にはクラウン（被せ物）を取り付けるようにしている。そして根管の拡大に際しては、リーマーやファイルと称される針状根管治療具が用いられている。 Conventionally, in the treatment of tooth decay in which caries has reached the pulp, the pulp, which is tissue containing damaged nerves and blood vessels, is extracted, and then the root canal where the pulp was located is expanded from the inside, using gutta-virtua.・Fill the root canal with drugs using points, etc., and then insert base material to reinforce the root canal. I'm trying to attach a (cover). For enlarging the root canal, a needle-like root canal treatment tool called a reamer or a file is used.

上述した針状根管治療具は、保持部とこの保持部に連続して根管の内面を削る作業部とからなる金属製品であり、保持部にあっては、歯科医が指先で挟み易いように樹脂製のグリップを取り付けたり、また歯科医が治療時に手持ちするハンドピースと称される歯科治療器具の先端部分にセットできる形態にしている。 The above-described needle-like root canal treatment instrument is a metal product consisting of a holding portion and a working portion that is continuous with the holding portion and scrapes the inner surface of the root canal. A grip made of resin can be attached, or it can be set at the tip of a dental treatment instrument called a handpiece held by a dentist during treatment.

また針状根管治療具の作業部は針状に細くなっており、外面には先端に向けて刃が螺旋状に回れた配置となるようにして形成されている部分である。そしてこの根幹治療具では元材を捩じって螺旋状の配置の刃を備えた作業部を形成しており、例えば特許文献１や特許文献２に示されているように、断面が四角形や三角形とされた部分を捩じることで、螺旋状の刃を備える作業部が形成されていた。 The working portion of the needle-like root canal treatment instrument is tapered like a needle, and the outer surface of the working portion is formed so that the blade is spirally wound toward the tip. In this root canal treatment tool, the base material is twisted to form a working part having spirally arranged blades. A working portion with a helical blade was formed by twisting the triangular portion.

また、根管治療に際しては、保持部にグリップを配した針状根管治療具を歯科医が指先で挟み持って根管を拡大する作業となる場合や、上述した針状根管治療具を先端の部分に取り付けた歯科治療器具を用いて行う場合もある。 In addition, during root canal treatment, when a dentist holds a needle-shaped root canal treatment instrument with a grip on the holding part between his or her fingertips to enlarge the root canal, or when the above-mentioned needle-shaped root canal treatment instrument is used. It may also be done with a dental instrument attached to the tip.

上記針状根管治療具を取り付けている歯科治療器具は、駆動部を内部に配置するとともに、先端の部分に、針状根管治療具の保持部が挿入されて前記治療具を支持するための治療具支持部を配置しており、駆動部の動作を駆動シャフトを介して治療具支持部に伝えて、針状根管治療具の作業部を動作させる仕組みを有しているものである。 The dental treatment instrument to which the needle-like root canal treatment instrument is attached has a driving part disposed inside, and a holding part of the needle-like root canal treatment instrument is inserted into the tip portion to support the treatment instrument. is arranged, and the operation of the driving part is transmitted to the treatment instrument support part via the drive shaft to operate the working part of the needle-like root canal treatment instrument. .

そして上記針状根管治療具を取り付けた歯科治療器具を含めて歯科医が用いる歯科治療器具では、駆動部側から治療具側へ駆動力を伝えてその治療具を動作させる機構としては、例えば特許文献３の歯に薬剤を塗布するカップを回転させる歯科治療器具に、駆動部側から回転を回転中心から偏倚させたロッドが旋回するとともに、そのロッドの先端を前記カップ治療具の保持部位にある縦溝部に摺動可能に突き当て位置させて、旋回するロッドの先端の動きによって、前記カップ治療具がこの治療具自体の長手方向の中心周りに所要の角度の範囲で揺動するようにして、カップ治療具のカップ部分が正逆回転を繰り返すようにした機構を備えている点が示されている。 In dental treatment instruments used by dentists, including the dental treatment instrument to which the needle-like root canal treatment instrument is attached, a mechanism for transmitting a driving force from the drive section side to the treatment instrument side to operate the treatment instrument includes, for example, In the dental treatment instrument that rotates the cup that applies medicine to the teeth of Patent Document 3, a rod whose rotation is deviated from the rotation center rotates from the drive part side, and the tip of the rod is attached to the holding portion of the cup treatment instrument. It is slidably abutted against a certain longitudinal groove, and the movement of the tip of the rotating rod causes the cup treatment device to swing about the longitudinal center of the treatment device itself within a required angle range. Moreover, it is shown that the cup portion of the cup treatment device is provided with a mechanism for repeating forward and reverse rotation.

また針状根管治療具を先端に取り付けた歯科治療器具に関わる特許文献４にも、器具先端の部分に配置された治療具支持部の外周にギアを形成して、このギアに、駆動部側からの駆動を伝える駆動シャフトの端部のギアを噛み合わせて、駆動シャフトの軸回転を治療具保持部の軸回転にして駆動力を伝える仕組みが示されていて、駆動部からの回転が、針状根管治療具の保持部の長手方向での中心が回転中心となる回転に変換されて、露出している作動部が軸回転するようにしている。 Also in Patent Document 4, which relates to a dental treatment instrument having a needle-like root canal treatment instrument attached to its tip, a gear is formed on the outer periphery of a treatment instrument support portion disposed at the tip of the instrument, and this gear is connected to a driving part. A mechanism is shown in which the gear at the end of the drive shaft that transmits the drive from the side is meshed, and the axial rotation of the drive shaft is the axial rotation of the treatment tool holder to transmit the driving force. , the center of the needle-like root canal treatment instrument in the longitudinal direction is converted into rotation with the center of rotation as the center of rotation, so that the exposed working part rotates about its axis.

特開昭５４－５０００９９号公報JP-A-54-500099 特開昭６０－１２９０４２号公報JP-A-60-129042 特開昭６２－１２０８４９号公報JP-A-62-120849 特開平０７－３２８０３４号公報JP-A-07-328034

針状根幹治療具を用いて根管を拡大する処置は、歯科医が針状根管治療具を指先で持って上下させながら根管の内面を削る場合、多くの労力が必要となる。そこで先端に針状根管治療具を作業部が表出するようにして取り付けられている歯科治療器具によって前記作業部を回転させながら根管の内面を削る作業を行なう場合も多いが、この針状根管治療具の作業部は、根管の内面を削る刃が螺旋状にして形成されているため、治療時に回転する作業部が根管の下端側へ進んで必要以上に入り込む可能性がある。 A procedure for enlarging a root canal using a needle-like root canal treatment tool requires a lot of labor when a dentist scrapes the inner surface of the root canal while holding the needle-like root canal treatment tool with his fingertips and moving it up and down. Therefore, in many cases, a dental treatment instrument having a needle-like root canal treatment instrument attached to the tip thereof with its working part exposed is used to shave the inner surface of the root canal while rotating the working part. Since the working part of the root canal treatment instrument has a helical blade that scrapes the inner surface of the root canal, there is a possibility that the rotating working part advances to the lower end of the root canal during treatment and enters more than necessary. be.

また、歯科治療器具を持って行なう根管の拡大形成では、回転しながら歯の内部を削っている針状根管治療具からの感触が伝わり難く、比較的軟らかい象牙質の部分に作業部が差し掛かっていたとしても作業部の先端側などで折れることもあって根管側に残った折れ端を取り除く処置が必要となる場合がある。さらに回転して削る作業部の歯状痕が付いてその歯状痕の手当てが必要となる不具合が生じ易かった。 In addition, when enlarging a root canal with a dental treatment instrument, the feel of the needle-like root canal treatment instrument, which grinds the inside of the tooth while rotating, is difficult to convey, and the working part is located in the relatively soft dentin. Even if it is approaching, it may break at the tip side of the working part, etc., and it may be necessary to remove the broken end remaining on the root canal side. In addition, there is a problem that tooth-like marks are left on the working part that is rotated and shaved, and it is necessary to treat the tooth-like marks.

さらに根管治療に際して菌に侵されて傷んでいる神経や血管などをきれいに除去する処置を行なうが、この処置の冶具として従来の針状根管治療具を回転させながら用いると、この針状根管治療具が歯の深部に進む動きが優先されがちになって傷んだ組織の取り除きが進まなかったり、上述したように根管の内面に歯状痕を付けてしまう不具合もあった。 Furthermore, during root canal treatment, treatment is performed to cleanly remove nerves and blood vessels that have been damaged by fungi. There is also a problem that the movement of the canal treatment instrument to advance into the deep part of the tooth tends to be prioritized, and the removal of damaged tissue does not proceed, and as described above, a tooth-like mark is left on the inner surface of the root canal.

本発明者にあっては、駆動源側で旋回するピンなどを動力の被伝達側に接触させ、旋回する前記ピンなどの運動を被伝達側の物体の一方向の往復移動に変換するように円運動を直線運動に代えるクランク機構に着目して本発明に至ったものであり、針状根管治療具をこの針状根管治療具の長さ方向に往復移動させて根管治療が行なえるようにすることを課題とし、針状根管治療具をその長さ方向の往復移動で根管の拡大を行なうなどの処置に適した形態にするとともに、針状根管治療具をその長さ方向に往復移動させることができる歯科治療器具を提供することを目的とするものである。 In the present inventor, a pin or the like rotating on the drive source side is brought into contact with the power transmission side, and the motion of the rotating pin or the like is converted into unidirectional reciprocating movement of an object on the transmission side. The present invention was achieved by paying attention to a crank mechanism that replaces circular motion with linear motion, and root canal treatment can be performed by reciprocating the needle-like root canal treatment tool in the longitudinal direction of the needle-like root canal treatment tool. The needle-shaped root canal treatment device is formed into a form suitable for treatment such as enlarging the root canal by reciprocating in its length direction, and the needle-shaped root canal treatment device is extended in its length. An object of the present invention is to provide a dental treatment instrument that can be reciprocated in the vertical direction.

（請求項１の発明）
本発明は上記課題を考慮してなされたもので、保持部（２）とこの保持部（２）に連続する作業部（３）とからなる針状根管治療具（１）において、作業部（３）の芯体（５）に、治療具長さ方向の往復移動によって歯科治療対象部位に対する処置を行なう処置部（９）が設けられていることを特徴とする針状根管治療具を提供して、上記課題を解消するものである。 (Invention of Claim 1)
The present invention has been made in consideration of the above problems. A needle-like root canal treatment instrument characterized in that the core body (5) of (3) is provided with a treatment section (9) for performing treatment on a site to be treated by reciprocating movement in the length direction of the treatment instrument. It is provided to solve the above problems.

（請求項２の発明）
そして、請求項１の発明において、前記処置部（９）は、作業部（３）の芯体（５）の外面に芯体（５）の径方向の外方に向けて張り出ていて張り出し端縁を刃部（７）とする刃板（６）であり、この刃板（６）が、作業部長さ方向に亘って芯体（５）の周囲を廻る螺旋状の配置にして、または芯体（５）の径方向の外方に向けて張り出る前記刃板（６）を芯体（５）の周囲を廻る環状の配置にしてこの環状の刃板（６）が作業部長さ方向に多段にして設けられているものとすることが可能である。 (Invention of Claim 2)
In the invention of claim 1, the treatment portion (9) protrudes outward in the radial direction of the core (5) from the outer surface of the core (5) of the working portion (3). a blade plate (6) with edges (7) in a helical arrangement around the core (5) over the length of the working length, or The blade plate (6) protruding outward in the radial direction of the core (5) is arranged in an annular shape around the periphery of the core (5), and this annular blade plate (6) extends in the longitudinal direction of the working portion. can be provided in multiple stages.

（請求項３の発明）
また、請求項１の発明において、前記処置部（９）は、作業部（３）の芯体（５）の先端に配置されて先端部分を押し込み面（１０）にして前記芯体（５）より太径とされた押圧体（１１）であることが可能である。 (Invention of Claim 3)
In addition, in the invention of claim 1, the treatment section (9) is arranged at the tip of the core body (5) of the working section (3), and the tip portion serves as a pushing surface (10) to push the core body (5). It is possible that the pressing body (11) has a larger diameter.

（請求項４の発明）
また、上記発明において、前記保持物（２）に取付穴（２ａ）を穿設して、前記作業部（３）の端部を前記取付穴（２ａ）に嵌め込むとともに、保持部（２）と作業部（３）とが接合材を介して一体となっていることが良好である。 (Invention of claim 4)
Further, in the above invention, a mounting hole (2a) is formed in the holder (2), the end of the working part (3) is fitted into the mounting hole (2a), and the holding part (2) is and the working part (3) are preferably integrated with each other through a bonding material.

（請求項５の発明）
また、上記発明において、前記保持部（２）の作業部（３）側の外周端に、治療具長さ方向に沿った断面形状が角丸となる丸面部（２ｂ）を設けていることが良好である。 (Invention of claim 5)
In the above invention, a round surface portion (2b) having rounded corners in a cross-sectional shape along the longitudinal direction of the treatment instrument may be provided at the outer peripheral end of the holding portion (2) on the side of the working portion (3). Good.

（請求項６の発明）
またもう一つの発明は、請求項１から５の何れか一項の針状根管治療具（１）と、前記針状根管治療具（１）の長さ方向を奥行き方向（Ａ）とする装着穴（２９）を有していて、この装着穴（２９）に針状根管治療具（１）の保持部（２）が挿入されて針状根管治療具（１）を支持し、かつ針状根管治療具（１）の前記作業部（３）が露出する治療具支持部（１６）と、先端面（３２）を前記治療具支持部（１６）側に臨ませて、前記治療具支持部（１６）と連結する連結シャフト（１７）と、前記連結シャフト（１７）を回転させる駆動部（１８）とを備え、
前記治療具支持部（１６）は、前記連結シャフト（１７）と相対する所定位置にこの治療具支持部（１６）の幅方向に形成された溝部（３１）を備え、
前記溝部（３１）は、治療具支持部（１６）の前記奥行き方向（Ａ）の一方側に形成された第一側壁（３３）と、治療具支持部（１６）の前記奥行き方向（Ａ）での他方側に形成された第二側壁（３４）とを備え、
前記連結シャフト（１７）は、前記先端面（３２）の中心から偏倚して配置される突部（３７）を備え、
前記治療具支持部（１６）に連結された連結シャフト（１７）の前記突部（３７）が、前記溝部（３１）に配置されていて、
前記連結シャフト（１７）が、前記駆動部（１８）の動作で回転して、この連結シャフト（１７）の回転によって前記先端面（３２）の中心周りを旋回する突部（３７）が、前記溝部（３１）の前記第一側壁（３３）及び前記第二側壁（３４）と接触してこれらを押圧し、治療具支持部（１６）をこの治療具支持部（１６）の前記奥行き方向（Ａ）に沿って往復移動させることを特徴とする歯科治療器具であり、この歯科治療器具を提供して、上記課題を解消するものである。 (Invention of claim 6)
Another invention is the needle-like root canal treatment device (1) according to any one of claims 1 to 5, wherein the length direction of the needle-like root canal treatment device (1) is defined as the depth direction (A). A holding part (2) of the needle-like root canal treatment instrument (1) is inserted into the mounting hole (29) to support the needle-like root canal treatment instrument (1). and a treatment instrument support portion (16) where the working portion (3) of the needle-like root canal treatment instrument (1) is exposed, and a distal end surface (32) facing the treatment instrument support portion (16), A connecting shaft (17) that connects with the treatment instrument support part (16), and a driving part (18) that rotates the connecting shaft (17),
The treatment instrument support part (16) has a groove part (31) formed in the width direction of the treatment instrument support part (16) at a predetermined position facing the connection shaft (17),
The groove (31) includes a first side wall (33) formed on one side of the treatment instrument support (16) in the depth direction (A), and a first side wall (33) formed on one side of the treatment instrument support (16) in the depth direction (A). a second sidewall (34) formed on the other side of the
The connecting shaft (17) has a protrusion (37) that is displaced from the center of the tip surface (32),
The projection (37) of the connecting shaft (17) connected to the treatment instrument support (16) is arranged in the groove (31),
The connecting shaft (17) rotates by the operation of the driving part (18), and the rotation of the connecting shaft (17) rotates the projection (37) around the center of the tip surface (32). The first side wall (33) and the second side wall (34) of the groove (31) are brought into contact with each other and pressed to move the treatment tool support part (16) in the depth direction ( A) is a dental treatment instrument characterized by reciprocating movement along A), and this dental treatment instrument is provided to solve the above problems.

（請求項７の発明）
そして請求項６の発明において、前記突部（３７）は、前記溝部（３１）内に配置される際、前記第一側壁（３３）と前記第二側壁（３４）との双方に摺接可能に接触することが良好である。 (Invention of claim 7)
In the sixth aspect of the invention, the protrusion (37) is slidably contactable with both the first side wall (33) and the second side wall (34) when arranged in the groove (31). It is good to be in contact with

（請求項８の発明）
また、請求項６または７の発明において、前記治療具支持部（１６）の前記奥行き方向（Ａ）に沿って形成される第一の通路（２２）と、前記奥行き方向（Ａ）に交差する方向に沿って形成されて前記第一の通路（２２）に連通する第二の通路（２３）とを備えるハウジング（１３）を更に備え、
前記治療具支持部（１６）は、前記第一の通路（２２）内に配置され、
前記連結シャフト（１７）は、前記第二の通路（２３）内に配置され、
前記第一の通路（２２）の内壁に、治療具支持部（１６）の前記奥行き方向（Ａ）に沿うライン状溝（３６）が形成され、
前記治療具支持部（１６）は、前記ライン状溝（３６）と相対する所定位置に、前記ライン状溝（３６）と略同幅で、前記治療具支持部（１６）が往復移動する方向を前記奥行き方向（Ａ）に規制する移動規制用突部（３５）を備えているものとすることが良好である。 (Invention of claim 8)
Further, in the invention of claim 6 or 7, the first passage (22) formed along the depth direction (A) of the treatment instrument support portion (16) intersects the depth direction (A). further comprising a housing (13) comprising a second passageway (23) formed along a direction and communicating with the first passageway (22);
The therapeutic device support (16) is disposed within the first passageway (22),
said connecting shaft (17) is arranged in said second passageway (23),
A linear groove (36) is formed in the inner wall of the first passage (22) along the depth direction (A) of the treatment instrument support (16),
The therapeutic instrument support part (16) is positioned at a predetermined position facing the linear groove (36) and has substantially the same width as the linear groove (36) in the direction in which the therapeutic instrument support part (16) reciprocates. It is preferable to provide a movement restricting protrusion (35) that restricts the movement in the depth direction (A).

（請求項９の発明）
また、請求項６から８の何れか一項の発明において、前記治療具支持部（１６）は座金（３０ａ）を介してねじ付ける蓋体（３０）を有していて、前記蓋体（３０）が、治療具支持部（１６）に挿入された針状根管治療具（１）の前記保持部（２）を支持することが良好である。 (Invention of claim 9)
In the invention according to any one of claims 6 to 8, the treatment instrument support part (16) has a cover (30) screwed through a washer (30a), and the cover (30) is screwed through a washer (30a). ) supports the holding part (2) of the needle-like root canal treatment instrument (1) inserted into the treatment instrument support part (16).

本発明の針状根管治療具によれば、作業部において芯体に処理部を有しているので、根管の内面に作業部を沿わせるなどして針状根管治療具を長さ方向前方に向けて僅かに往復移動させることで処理部が根管の組織などの歯科治療対象部位に対して繰り返し衝突するようになり、針状根管治療具を長さ方向に沿って往復移動させるという簡易な動作で効率よく根管治療を行なうことができる。 According to the needle-like root canal treatment instrument of the present invention, since the working part has the treatment part on the core body, the needle-like root canal treatment instrument can be lengthened by, for example, running the working part along the inner surface of the root canal. By slightly reciprocating forward in the direction, the treatment unit repeatedly collides with the target site for dental treatment such as the tissue of the root canal, and the needle-like root canal treatment instrument is reciprocated along the length direction. Root canal treatment can be performed efficiently by a simple operation of allowing the device to move.

また本発明の歯科治療器具によれば、上記針状根管治療具を長さ方向に沿って往復移動させるので、この歯科治療器具によって効率よく根管の内面の組織や傷んだ歯髄などを除去でき、根管治療の労力を削減することができるという効果を奏するものである。 Further, according to the dental treatment instrument of the present invention, since the needle-like root canal treatment instrument is reciprocally moved along the length direction, the dental treatment instrument efficiently removes tissue on the inner surface of the root canal and damaged pulp. Therefore, it is possible to reduce labor for root canal treatment.

本発明に係る針状根管治療具の一例を一部拡大して示す説明図である。FIG. 2 is an explanatory view showing a partially enlarged example of a needle-like root canal treatment instrument according to the present invention; 針状根管治療具の他の例を示す説明図である。FIG. 4 is an explanatory diagram showing another example of a needle-like root canal treatment instrument; 綿・充填材押し込みの処理部がある針状根管治療具の例を示す説明図である。FIG. 10 is an explanatory view showing an example of a needle-like root canal treatment instrument having a cotton/filler pressing portion. 本発明に係る歯科治療器具の一例を示す説明図である。1 is an explanatory diagram showing an example of a dental treatment instrument according to the present invention; FIG. 歯科治療器具の一例における内部を示す説明図である。FIG. 2 is an explanatory diagram showing the inside of an example of a dental treatment instrument; 歯科治療器具での治療具支持部の配置を概略的に示す説明図である。FIG. 4 is an explanatory diagram schematically showing the arrangement of a treatment instrument support part in a dental treatment instrument; 治療具支持部における支持部本体の溝部を示すもので、（ａ）は奥行き方向に直交する方向から見た状態で示す説明図、（ｂ）は溝部をこの溝部に面する側から見た状態で示す説明図、（ｃ）は装着穴を示す説明図である。Fig. 2 shows a groove portion of a supporting portion main body in a treatment instrument supporting portion, (a) is an explanatory diagram showing a state viewed from a direction perpendicular to the depth direction, and (b) is a state of the groove portion viewed from the side facing this groove portion. , and (c) is an explanatory view showing a mounting hole.

つぎに本発明を図１から図７に示す実施の形態に基づいて詳細に説明する。 Next, the present invention will be described in detail based on the embodiments shown in FIGS. 1 to 7. FIG.

（針状根管治療具）
図中１は根管治療に用いる針状根管治療具を示していて、図１に示されているように前記針状根管治療具１は保持部２とこの保持部２に連続して細い略針形状とされた作業部３とからなるものであり、前記保持部２を支えながら全体的に細く小さい針状根管治療具１の取り回しが行なわれ、作業部３を根管の内面などに沿わせて動かすことで根管を拡大するなど、根管治療に関する処置が行なわれるようにしているものである。 (Needle-shaped root canal treatment instrument)
In the figure, 1 indicates a needle-like root canal treatment tool used for root canal treatment, and as shown in FIG. It consists of a working portion 3 having a thin, substantially needle-like shape, and while supporting the holding portion 2, the thin and small needle-like root canal treatment instrument 1 is handled as a whole, and the working portion 3 is placed on the inner surface of the root canal. Root canal treatment, such as enlarging the root canal, is performed by moving it along the root canal.

（保持部）
針状根管治療具１の治療具本体は金属材から構成されていて、上記保持部２は、歯科医が指先で挟み持ち易いように、また後述の歯科治療器具での一構成部材として取付状態を安定させるように太径とした金属製のグリップ４として形成されている。前記保持部２であるグリップ４の中心の部分からは治療具本体が延びて作業部３に連続しており、この作業部３は、根管治療での処置に応じる形状を備えている。 (Holding part)
The main body of the needle-like root canal treatment instrument 1 is made of a metal material, and the holding part 2 is attached so that the dentist can easily hold it between his/her fingertips, and also as a constituent member of the dental treatment instrument to be described later. It is formed as a metal grip 4 with a large diameter so as to stabilize the state. A treatment instrument body extends from the central portion of the grip 4, which is the holding portion 2, and continues to a working portion 3. The working portion 3 has a shape suitable for root canal treatment.

（作業部）
図１に実施の形態の一例として図示した針状根管治療具１は根管を拡大形成する治療具である。そして、作業部３は可撓性を備え、治療具本体を針状としてなる芯体５の外面に、前記芯体５の径方向の外方に向けて刃板６が張り出るようにして一体に設けられて後述の処置部９が形成されている。前記刃板６は張り出し端縁を刃部７としており、刃板６の刃部７を根管の内面に当てながら針状根管治療具１全体を治療具の長さ方向に沿って往復移動させることで、刃板６における針状根管治療具１の長さ方向で相対する面それぞれをすくい面８になって刃部７により根管の組織が削られるようにしている。また、作業部３は往復移動を行なう動きであるため、この作業部３の先端部分にあっては歯の内部の組織に対する突き当てにとどまって、根管深部への不必要な入り込みを起さないように設けられている。さらには傷んだ歯髄の取り除きに際しては、歯髄を刃板６自体で受けて絡み取りを行なわせ易くなるように設けられている。 (work department)
A needle-like root canal treatment tool 1 illustrated as an example of an embodiment in FIG. 1 is a treatment tool for enlarging and forming a root canal. The working part 3 is flexible, and integrated with the outer surface of a core body 5 having a needle-like therapeutic instrument body so that a blade plate 6 protrudes outward in the radial direction of the core body 5 . , and a treatment portion 9, which will be described later, is formed. The blade plate 6 has a protruding edge as a blade portion 7, and the entire needle-like root canal treatment instrument 1 is reciprocated along the length direction of the treatment tool while the blade portion 7 of the blade plate 6 is in contact with the inner surface of the root canal. By doing so, the surfaces of the blade plate 6 facing each other in the longitudinal direction of the needle-like root canal treatment instrument 1 become rake surfaces 8 so that the tissue of the root canal can be scraped by the blade portion 7 . In addition, since the working part 3 moves reciprocatingly, the tip of the working part 3 only abuts against the tissue inside the tooth, causing unnecessary penetration into the deep part of the root canal. It is set up so that it does not Furthermore, when removing the damaged pulp, the blade plate 6 itself is provided so as to receive the pulp and facilitate entanglement.

作業部３における上記刃板６は、図１に示されているように作業部３の長さ方向に亘って芯体５の周囲を廻る螺旋状の配置とされている。そして、刃板６の径方向への張り出し寸法は作業部３の先端（尖頭となっている部分）に進むに従って徐々に小さくなっており、保持部２側となる刃板６の張り出し端縁の位置と先端側の刃板６の張り出し端縁の位置とを結んだ線が直線状となるようにして、針状根管治療具１を側方から見たときに作業部３の側面視形状を鋭く細長い三角形状にしている。 As shown in FIG. 1, the blade plate 6 in the working portion 3 is arranged in a spiral shape around the core 5 along the length of the working portion 3 . The radial extension of the blade plate 6 gradually decreases toward the tip (pointed portion) of the working portion 3. A side view of the working part 3 when the needle-like root canal treatment instrument 1 is viewed from the side so that the line connecting the position of and the position of the overhanging edge of the blade plate 6 on the distal side is straight. The shape is sharp and elongated triangular.

作業部３に螺旋状にして保持部２から作業部先端側に向けて連続する上記刃板６を設けている針状根管治療具１を用いて根管を拡大するなどの処置を行なう場合は、作業部３を根管の内面に沿わせるようにして針状根管治療具１全体を長さ方向に上げ下げするように往復移動させればよく、根管の内面の組織に刃板６の刃部７が突き当たった状態であるため、刃板６の往復移動で内面の組織を削り取ることができる。 When a treatment such as enlarging a root canal is performed using the needle-like root canal treatment instrument 1 in which the working portion 3 is spirally provided with the blade plate 6 continuing from the holding portion 2 toward the distal end of the working portion. In this case, the entire needle-like root canal treatment instrument 1 is reciprocally moved up and down in the longitudinal direction with the working part 3 along the inner surface of the root canal. Since the blade portion 7 is in abutted state, the tissue on the inner surface can be scraped off by the reciprocating movement of the blade plate 6.例文帳に追加

（刃板の配置の他例）
上記実施の形態では刃板６を螺旋状の配置としたが、本発明の針状根管治療具はこの例に限定されるものではない。図２は他の例をしていて、この図２に示す針状根管治療具１では、作業部３の刃板６（処置部９）を芯体５の周囲を廻る環状の配置にし、環状の刃板６が作業部３の長さ方向に間隔を置いて多段にして設けられている。そして、上記例と同様に複数の刃板６の径方向への張り出し寸法は作業部３の先端に進むに従って徐々に小さく、保持部２側となる刃板６の張り出し端縁の位置と先端側の刃板６の張り出し端縁の位置とを線が直線とされて、側方から見たときに作業部３の側面視形状が鋭く細長い三角形状とされているものである。 (Other examples of arrangement of blade plates)
Although the blade plate 6 is arranged in a spiral shape in the above embodiment, the needle-like root canal treatment instrument of the present invention is not limited to this example. FIG. 2 shows another example. In the needle-like root canal treatment instrument 1 shown in FIG. Annular blade plates 6 are provided in multiple stages at intervals in the length direction of the working portion 3 . As in the above example, the radial extension of the plurality of blade plates 6 gradually decreases toward the tip of the working portion 3. The position of the protruding edge of the blade plate 6 is set as a straight line, and the side view shape of the working part 3 is a sharp and elongated triangular shape when viewed from the side.

また上記刃板６を螺旋状の配置とした例及び環状にして多段に配置した例においても、刃板６の張り出し寸法が作業部３の先端側に向けて徐々に小さくなるものとしているが、作業部３の芯体５自体を径が長さ方向で同じにして刃板６の張り出し寸法も長さ方向で同じとなるようにすることも可能である。 Also, in the example in which the blade plate 6 is arranged in a spiral shape and the example in which the blade plate 6 is arranged in a ring and arranged in multiple stages, the overhang dimension of the blade plate 6 gradually decreases toward the tip side of the working portion 3. It is also possible to make the diameter of the core body 5 itself of the working part 3 the same in the length direction and to make the overhang dimension of the blade plate 6 the same in the length direction.

さらに上記例の針状根管治療具１においては、根管の内面に可撓性を備える作業部３を沿わせて長さ方向に往復移動させ、その往復移動によって根管の内面の組織を削ることができるように刃板６を有していて、作業部３の上記刃板６それぞれは、長さ方向に沿った往復移動によって削るという処置を行なう処置部９となっているものである。しかし、根管治療は根管の内面を削る処置だけではなく、薬剤の充填や土台の形成などの多くの処置が行われており、作業部３の太さなどが異なる複数の針状根管治療具１が使い分けされる。 Further, in the needle-like root canal treatment instrument 1 of the above example, the working part 3 having flexibility is reciprocated along the inner surface of the root canal in the lengthwise direction, and the tissue on the inner surface of the root canal is removed by the reciprocating movement. Blade plates 6 are provided for scraping, and each of the blade plates 6 of the working portion 3 serves as a treatment portion 9 for performing scraping treatment by reciprocating along the length direction. . However, root canal treatment involves not only the treatment of shaving the inner surface of the root canal, but also many treatments such as filling with a drug and forming a base. The treatment tool 1 is used properly.

そして、本針状根管治療具１の作業部３にあっては削る処置のみに対応するものに限定されない。図３は上記処置とは異なる処置部９が作業部３に設けられている針状根管治療具１を示していて、この針状根管治療具１は、長さ方向の往復移動によって根管に仮置き綿や充填薬剤を詰める処置を行なうようにした処置部９が作業部３の先端側（芯体５の先端側）に配置されている。 Further, the working part 3 of the present needle-shaped root canal treatment instrument 1 is not limited to one that corresponds only to the treatment of scraping. FIG. 3 shows a needle-like root canal treatment instrument 1 in which a working part 3 is provided with a treatment portion 9 different from the treatment described above. A treatment section 9 is disposed on the distal end side of the working section 3 (the distal end side of the core body 5) so as to fill the tube with temporary cotton or a filling agent.

上記例の処置部９は先端部分の突出端面を緩やかな球面を呈する押し込み面１０として芯体５より太径の押圧体１１からなるもので、保持具本体の金属材を芯体の先端部分を太くすることで形成されている。そして押し込み面１０を備えた処置部９を作業部３に有する針状根管治療具１は、上述したように根管を拡大した部分に仮置き綿や充填薬剤を詰める処置などを行なう場合に用いられ、針状根管治療具１を長さ方向に往復移動させながら処置部９の押し込み面１０で対象物を少しずつ押し下げて定置させる作業に適したものとなる。なお、押圧体１１の保持部２側の周縁部分は、歯の内面との摺接によって不必要な削りを生じさせないように角丸を呈する形状にしておくことが望ましい。 The treatment portion 9 in the above example is composed of a pressing body 11 having a diameter larger than that of the core body 5 and a protruding end face of the distal end portion as a pressing surface 10 having a gently spherical surface. It is formed by thickening. The needle-like root canal treatment instrument 1 having the treatment portion 9 having the pushing surface 10 in the working portion 3 is used when performing a treatment such as stuffing temporary cotton or a filling agent into the enlarged portion of the root canal as described above. It is suitable for the work of gradually pushing down the object with the pushing surface 10 of the treatment portion 9 while reciprocating the needle-shaped root canal treatment instrument 1 in the longitudinal direction to fix it. It is desirable that the peripheral portion of the pressing member 11 on the side of the holding portion 2 has rounded corners so as not to cause unnecessary shaving due to sliding contact with the inner surface of the tooth.

図示されているように針状根管治療具１では、保持部２に穿設した取付穴２ａに作業部３の基端３ａ（芯体５の基端）を嵌め込むとともに、保持部２の金属材と作業部３の金属材とを良好に連結させる接合材を用いて、保持部２と作業部３とが強固に一体となっている。この点は、後述の歯科治療器具に用いる場合の針状根管治療具においても同様である。 As shown in the figure, in the needle-shaped root canal treatment instrument 1, the proximal end 3a of the working portion 3 (the proximal end of the core 5) is fitted into the attachment hole 2a drilled in the holding portion 2, and the holding portion 2 is The holding part 2 and the working part 3 are firmly integrated with each other by using a bonding material that satisfactorily connects the metal material and the working part 3 . This point also applies to a needle-like root canal treatment instrument used in a dental treatment instrument, which will be described later.

また、針状根管治療具１の保持部２では、作業部３側の外周端に、治療具長さ方向に沿った断面形状が角丸となる丸面部２ｂを設けていて、この丸面部２ｂは保持部２の周方向に亘って位置している。 In addition, in the holding part 2 of the needle-like root canal treatment instrument 1, a round surface part 2b having rounded corners in a cross-sectional shape along the length direction of the treatment instrument is provided at the outer peripheral end on the working part 3 side. 2b is positioned along the circumferential direction of the holding portion 2. As shown in FIG.

（歯科治療器具）
上記針状根管治療具１は歯科医が指先で挟み持って各種の処置を行なう場合に単体で使用されるものであるが、図４と図５は電動などの動力を用いて針状根管治療具１を動作させるもう一つの発明である歯科治療器具１２が示されていて、この歯科治療器具１２は歯科医が治療に際して手持ちするハンドピースと称される細身の電動器具である。 (Dental treatment instrument)
The needle-shaped root canal treatment instrument 1 is used alone when a dentist holds it between his/her fingertips and performs various treatments. A dental treatment instrument 12, which is another invention for operating the tube treatment instrument 1, is shown, and this dental treatment instrument 12 is a slender electric instrument called a handpiece that is held by a dentist during treatment.

そして図４と図５とに示すように歯科治療器具１２は、治療具側ハウジング１３とこの治療具側ハウジング１３に対し傾斜して接続される把持側ハウジング１４とからなるケース１５に、長さ方向に往復移動する上記針状根管治療具１と、前記針状根管治療具１を支持する治療具支持部１６と、一軸の連結シャフト１７と、小型モータからなる駆動部１８とが組み入れられて、針状根管治療具１を動作させる駆動系が、前記治療具支持部１６と連結シャフト１７と駆動部１８とで構成されている。なお、歯科治療器具１２において図示した針状根管治療具１は一例であり、歯科治療器具１はこの図示された針状根管治療具１を有するものに限定されない。 As shown in FIGS. 4 and 5, the dental treatment instrument 12 is provided in a case 15 comprising a treatment instrument side housing 13 and a gripping side housing 14 connected to the treatment instrument side housing 13 at an angle. The needle-like root canal treatment tool 1 reciprocally moves in the direction, the treatment-instrument support part 16 supporting the needle-like root canal treatment tool 1, the uniaxial connecting shaft 17, and the drive part 18 consisting of a small motor are incorporated. A drive system for operating the needle-like root canal treatment instrument 1 is composed of the treatment instrument support portion 16 , the connecting shaft 17 and the drive portion 18 . Note that the needle-like root canal treatment tool 1 illustrated in the dental treatment instrument 12 is an example, and the dental treatment instrument 1 is not limited to having the illustrated needle-like root canal treatment tool 1 .

（治療具側ハウジング）
上記治療具側ハウジング１３は先端部２０とこの先端部２０の側面側に外方に伸びる鶴首部２１とからなり、後述するように針状根管治療具１の保持部２が挿入される治療具支持部１６を移動可能に収める第一の通路２２が形成され、前記鶴首部２１に上記連結シャフト１７を軸回転可能にして収める第二の通路２３が形成されており、第二の通路２３は前記第一の通路２２に連通している。 (Treatment tool side housing)
The treatment instrument side housing 13 is composed of a distal end portion 20 and a hooked neck portion 21 extending outward on the lateral side of the distal end portion 20. As will be described later, the treatment instrument side housing 13 is inserted into the holding portion 2 of the needle-like root canal treatment instrument 1 for treatment. A first passage 22 is formed to movably accommodate the tool support portion 16, and a second passage 23 is formed to accommodate the connecting shaft 17 so as to be rotatable in the neck portion 21. The second passage 23 communicates with the first passage 22 .

（把持側ハウジング）
把持側ハウジング１４は上記駆動部１８を構成する小型モータを収める収納空間２４があって、前記小型モータへの通電コードなどコード類を把持側ハウジング１４の底板から外部機器に接続するための通孔を備えているとともに、駆動部１８における小型モータの出力シャフト２５が、治療具側ハウジング１３の第二の通路２３に位置する連結シャフト１７にギアを介して連結して回転させることができるように、収納空間２４が前記第二の通路２３とが連通している。 (Holding side housing)
The grip-side housing 14 has a storage space 24 for accommodating the small motor that constitutes the drive unit 18, and through-holes for connecting cords such as power cords to the small motor from the bottom plate of the grip-side housing 14 to external devices. and the output shaft 25 of the small motor in the drive unit 18 is connected via a gear to the connection shaft 17 located in the second passage 23 of the treatment instrument side housing 13 so that it can be rotated. , the storage space 24 communicates with the second passage 23 .

なお、針状根管治療具１と治療具支持部１６と連結シャフト１７とを組み付けた治療具側ハウジング１３と、駆動部１８を収めている把持側ハウジング１４とは、分離可能に接続されているものであって、針状根管治療具１の種類を変えるときには、治療具側ハウジング１３を把持側ハウジング１４から外し、他の種類の針状根管治療具１が予め収められている治療具側ハウジングごと交換すればよい。 The treatment-instrument-side housing 13 in which the needle-shaped root canal treatment instrument 1, the treatment-instrument support portion 16, and the connecting shaft 17 are assembled, and the grip-side housing 14 in which the driving portion 18 is housed are separably connected. When changing the type of the needle-like root canal treatment instrument 1, the treatment-instrument-side housing 13 is removed from the holding-side housing 14, and another type of needle-like root canal treatment instrument 1 is stored in advance. It is sufficient to replace the tool-side housing together.

（治療具支持部）
針状根管治療具１を支持する治療具支持部１６は、略筒体とされた支持部本体２６の一端に位置する側壁部分にある透孔２７に、支持部本体２６の他端の開口２８側から針状根管治療具１の作業部３を通し、針状根管治療具１の長さ方向を奥行き方向Ａとする前記支持部本体２６の装着穴２９に、針状根管治療具１の保持部２を挿入している。そして、支持部本体２６の前記開口２８に蓋体３０をねじ付けて、開口２８側に座金３０ａを介在させながら蓋体３０を支持部本体２６に取り付けるとともに、蓋体３０によって保持部２を支持部本体２６の前記側壁部分（透孔２７が位置する壁側）に押し付けて支持していて、作業部３を露出させた状態で針状根管治療具１を、この歯科治療器具１２の内部で支えるようにしている。（図６参照） (Treatment tool support part)
The treatment instrument support part 16 for supporting the needle-like root canal treatment instrument 1 has a through hole 27 in a side wall portion located at one end of a substantially cylindrical support body 26 and an opening at the other end of the support body 26 . The working part 3 of the needle-shaped root canal treatment device 1 is passed from the 28 side, and the needle-shaped root canal treatment device is inserted into the attachment hole 29 of the support body 26 whose depth direction A is the length direction of the needle-like root canal treatment device 1 . The holding part 2 of the tool 1 is inserted. Then, the lid 30 is screwed to the opening 28 of the support body 26 , and the lid 30 is attached to the support body 26 with a washer 30 a interposed on the opening 28 side, and the holding part 2 is supported by the lid 30 . The needle-like root canal treatment instrument 1 is pushed against and supported by the side wall portion (the wall side where the through hole 27 is located) of the dental treatment instrument 12 with the working part 3 exposed. I'm trying to support it. (See Figure 6)

針状根管治療具１の保持部２を内部に配した上記支持部本体２６は、後述するように奥行き方向Ａに往復移動する。その際、保持部２が支持部本体２６の内部で僅かながら奥行き方向Ａに振動する可能性がある。しかしながら、保持部２の作業部３側の外周端に上記丸面部２ｂを有し、この丸面部２ｂは奥行き方向Ａ（治療具長さ方向）に沿った断面が角丸となる形状であるため、支持部本体２６の内部の内周面と丸味を呈する保持部２の丸面部２ｂとが摺接する。その結果、支持部本体２６の内面や保持部２が摩耗することがない。よって、支持部本体２６の内部で保持部２はガタ付くことはない。 The supporting portion body 26, in which the holding portion 2 of the needle-like root canal treatment instrument 1 is arranged, reciprocates in the depth direction A as will be described later. At that time, there is a possibility that the holding portion 2 may slightly vibrate in the depth direction A inside the support portion main body 26 . However, since the holding portion 2 has the round surface portion 2b at the outer peripheral end on the working portion 3 side, and the round surface portion 2b has a shape in which the cross section along the depth direction A (the length direction of the therapeutic device) has rounded corners. , the inner peripheral surface inside the supporting portion body 26 and the round surface portion 2b of the holding portion 2 having a roundness come into sliding contact with each other. As a result, the inner surface of the support portion main body 26 and the holding portion 2 are not worn. Therefore, the holding portion 2 does not rattle inside the support portion main body 26 .

また、上記蓋体３０は座金３０ａを介在させた状態にして支持部本体２６にねじ付けられているので、支持部本体２６が往復移動している時点の蓋体３０の回転が確実に防止さ
れ、蓋体３０にて保持部２を支持部本体２６の透孔２７が位置する側の側壁に確実に押さえ付ける状態を維持できる。 Further, since the cover 30 is screwed to the support body 26 with the washer 30a interposed therebetween, the cover 30 is reliably prevented from rotating while the support body 26 is reciprocating. , the state in which the holding portion 2 is reliably pressed against the side wall of the supporting portion main body 26 on the side where the through hole 27 is located by the lid 30 can be maintained.

図７（ｂ）（ｃ）に示されているように治療具支持部１６の上記支持部本体２６の外面の一部分に、治療具支持部１６の幅方向であって上記奥行き方向Ａ（針状根管治療具１の長手方向）に直交する方向に沿う溝部３１を備えている。そして溝部３１側に上記連結シャフト１７の先端面３２が臨んでいて、連結シャフト１７が治療具支持部１６の奥行き方向Ａと直交する方向にして連結されている。 As shown in FIGS. 7(b) and 7(c), a portion of the outer surface of the support main body 26 of the treatment tool support 16 is formed in the width direction of the treatment tool support 16 and in the depth direction A (needle-shaped). A groove portion 31 is provided along a direction orthogonal to the longitudinal direction of the root canal treatment instrument 1 . The distal end surface 32 of the connecting shaft 17 faces the groove 31 side, and the connecting shaft 17 is connected in a direction orthogonal to the depth direction A of the therapeutic instrument support portion 16 .

（溝部）
上記溝部３１は奥行き方向での断面形状が下開きの溝とされ、図７（ａ）に示されているように奥行き方向Ａの一方側に第一側壁３３が位置し、奥行き方向Ａでの他方側に第二側壁３４が位置して、第一側壁３３と第二側壁３４とを奥行き方向Ａで平行に相対するように形成されている。 (groove)
The groove portion 31 has a downward-opening groove in cross section in the depth direction, and as shown in FIG. The second side wall 34 is positioned on the other side, and the first side wall 33 and the second side wall 34 are formed so as to face each other in parallel in the depth direction A.

第一側壁３３と第二側壁３４とを有する溝部３１に上記連結シャフト１７の先端面３２側を連結させ、回転（軸回転）する連結シャフト１７の運動を、前記溝部３１を利用して治療具支持部１６が奥行方き向Ａに沿って往復移動する運動に変換させるために、まず、上記第一の通路２２自体が治療具支持部１６の奥行き方向Ａに沿った方向に形成されている。なお、連結シャフト１７が治療具支持部１６の長さ方向（奥行き方向Ａ）に対して直角の配置とするために、連結シャフト１７が収められる鶴首部２１の第二の通路２３は、第一の通路２２に対して直角にして連通している。 A groove portion 31 having a first side wall 33 and a second side wall 34 is connected to the distal end surface 32 side of the connecting shaft 17, and the movement of the rotating (axially rotating) connecting shaft 17 is controlled by the groove portion 31. First, the first passage 22 itself is formed along the depth direction A of the treatment instrument support portion 16 in order to convert the motion of the support portion 16 into reciprocating motion along the depth direction A. . In addition, since the connecting shaft 17 is arranged perpendicular to the length direction (depth direction A) of the treatment instrument supporting portion 16, the second passage 23 of the crane neck portion 21 in which the connecting shaft 17 is accommodated is the first passage. communicates at right angles to the passage 22 of the .

さらに支持部本体２６には、上記溝部３１とは反対側の位置にして支持部本体２６の径方向での外方に向けて突出した移動規制用突部３５が一体に設けられている。そして上記第一の通路２２の内壁には、奥行き方向Ａに沿ってライン状溝３６が形成されており、このライン状溝３６に前記移動規制用突部３５が位置し、治療具支持部１６が往復移動する運動の方向を奥行き方向Ａに規制しており、且つ治療具支持部１６が軸回転しないように図られている。なお、ライン状溝３６の幅と移動規制用突部３５の幅とはほぼ同幅であり、移動規制用突部３５の幅は、治療具支持部１６が軸回転方向でブレを起さない範囲にして、ライン状溝３６に沿ってスムーズに移動規制用突部３５が移動できる幅とされている。 Further, the support body 26 is integrally provided with a movement restricting protrusion 35 projecting outward in the radial direction of the support body 26 at a position opposite to the groove 31 . A line-shaped groove 36 is formed in the inner wall of the first passage 22 along the depth direction A. The movement-regulating protrusion 35 is positioned in the line-shaped groove 36, and the therapeutic instrument support portion 16 is positioned. restricts the direction of reciprocating motion to the depth direction A, and is designed to prevent the treatment instrument support part 16 from axially rotating. The width of the line-shaped groove 36 and the width of the movement restricting protrusion 35 are substantially the same, and the width of the movement restricting protrusion 35 is such that the treatment instrument supporting portion 16 does not shake in the axial rotation direction. The width is such that the movement restricting protrusion 35 can move smoothly along the linear groove 36 .

（連結シャフト）
図７（ｂ）に示すように連結シャフト１７は治療具支持部１６に臨む先端面３２に、この先端面３２の中心から外周側に偏倚して配置されている突部３７を備えている。そして、突部３７が上記溝部３１に配置されることによって連結シャフト１７の先端面３２側が治療具支持部１６に連結されている。駆動部１８の出力シャフト２５が回転し、この出力シャフト２５側のギアと連結シャフト１７側のギアとの噛み合いによって連結シャフト１７が回転し、連結シャフト１７の回転によって突部３７が先端面３２の中心周りを旋回するように設けられている。 (Connecting shaft)
As shown in FIG. 7(b), the connecting shaft 17 has a protrusion 37 on the distal end surface 32 facing the treatment instrument support portion 16, which is displaced from the center of the distal end surface 32 toward the outer peripheral side. The distal end surface 32 side of the connecting shaft 17 is connected to the therapeutic instrument supporting portion 16 by arranging the protrusion 37 in the groove portion 31 . The output shaft 25 of the drive unit 18 rotates, and the gear on the output shaft 25 side and the gear on the connection shaft 17 side mesh with each other to rotate the connection shaft 17 . It is provided so as to revolve around the center.

上記突部３７は溝部３１の第一側壁３３及び第二側壁３４と摺接可能に接触するものであり、旋回する突部３７が支持部本体２６の上記透孔２７側に向けて回るときには第一側壁３３を押圧し、突部３７が支持部本体２６の開口２８側に向けて回るときには第二側壁３４を押圧して、突部３７が旋回することで治療具支持部１６をこの治療具支持部１６の奥行き方向Ａに沿って往復移動させる。 The protrusion 37 is in slidable contact with the first side wall 33 and the second side wall 34 of the groove 31, and when the turning protrusion 37 turns toward the through hole 27 side of the support body 26, the When the one side wall 33 is pressed and the protrusion 37 turns toward the opening 28 side of the support main body 26, the second side wall 34 is pressed and the protrusion 37 rotates to rotate the treatment tool support part 16 to the treatment tool. The support portion 16 is reciprocated along the depth direction A.

このように連結シャフト１７の回転（軸回転）の動きが、治療具支持部１６の奥行き方向Ａに沿った往復移動の動きに変換されるようにしており、治療具支持部１６に支持されている針状根管治療具１は駆動部１８からの駆動の下で奥行き方向Ａ、即ちこの針状根管治療具１の長さ方向に沿って作業部３が往復移動するように設けられている。 In this way, the rotational (rotational) motion of the connecting shaft 17 is converted into the reciprocating motion of the therapeutic device support portion 16 along the depth direction A. The needle root canal treatment instrument 1 is provided so that the working part 3 reciprocates along the depth direction A, that is, along the length direction of the needle root canal treatment instrument 1 under the drive from the driving part 18 . there is

なお、上記突部３７にあっては、この突部３７が溝部３１内に配置されるときに、第一側壁３３と第二側壁３４との双方に摺接可能に接触するものとされている。このように突部３７が第一側壁３３と第二側壁３４との両側壁に同時に摺接可能に接触することで、ガタ付きなく治療具支持部１６を奥行き方向Ａに往復移動させる上で有効であり、針状根管治療具１の作業部３を長さ方向にスムーズに往復移動させる上で有効である。 The projection 37 contacts both the first side wall 33 and the second side wall 34 in a slidable manner when the projection 37 is arranged in the groove 31. . In this manner, the protrusion 37 is in contact with both side walls of the first side wall 33 and the second side wall 34 so as to be slidable at the same time, which is effective in reciprocating the treatment instrument support portion 16 in the depth direction A without backlash. , which is effective for smoothly reciprocating the working portion 3 of the needle-shaped root canal treatment instrument 1 in the longitudinal direction.

歯科治療器具１２において針状根管治療具１を交換する場合には、例えば治療具側ハウジング１３を把持側ハウジング１４から分離し、鶴首部２１での第二の通路２３から連結シャフト１７を抜くようにする。つぎに治療具側ハウジング１３での先端側に位置していて治療具支持部１６を針状根管治療具１とともに第一の通路２２から抜き出す。さらに、治療具支持部１６の蓋体３０を外して針状根管治療具１を取り出し、この後に新たな針状根管治療具１を前記治療具支持部１６に取り付けて、前述の手順の逆にして歯科治療器具１２を組み上げるようにすればよい。 When replacing the needle-like root canal treatment instrument 1 in the dental treatment instrument 12, for example, the treatment instrument side housing 13 is separated from the grip side housing 14, and the connecting shaft 17 is pulled out from the second passage 23 at the crane neck portion 21. make it Next, the treatment tool supporting portion 16 located on the distal end side of the treatment tool side housing 13 is extracted from the first passage 22 together with the needle-like root canal treatment tool 1 . Further, the cover 30 of the treatment instrument support portion 16 is removed, the needle-like root canal treatment instrument 1 is taken out, and then a new needle-like root canal treatment instrument 1 is attached to the treatment instrument support portion 16, and the procedure described above is performed. The dental treatment instrument 12 may be assembled in reverse.

上述した歯科治療器具１２については、保持部２を指で挟み持って根管治療を行なうことができる針状根管治療具１を取り付けたものとしているが、本発明の歯科治療器具１２においては、上記治療具支持部１６に保持部２を挿入可能とされた針状根管治療具１であれば使用できるものであり、この歯科治療器具１２に対して器具への取付専用として形成された針状根管治療具１を用いることも可能である。 The above-described dental treatment instrument 12 is provided with the needle-like root canal treatment instrument 1 that allows root canal treatment to be performed by pinching the holding portion 2 between fingers. Any needle-like root canal treatment instrument 1 in which the holding part 2 can be inserted into the treatment instrument support part 16 can be used. It is also possible to use the needle-like root canal treatment instrument 1 .

（本実施の形態のメリット）
従来の針状根管治療具については、上述したように三角柱状や四角柱状の金属材を捩じり込みして刃部を螺旋状にして作業部の長さ方向に亘り形成しており、前記捩じり込みによって保持部側のみにすくい面が存在するものとなっている。そのため、従来の針状根管治療具を指先に挟み持って根管を拡大するなどの処置を行なう場合には、根管の内面などの処置対象部位に作業部を沿わせて刃部の捩じり方向に沿って回し進めるなど、回転操作を伴なわせながら処置を行なわなければならない。即ち、従来の針状根管治療具を回転させずにそのまま根管の先に進めたり、また逆方向に作業部が回るように回転させても歯の内部組織を削ることができず、治療を行なう歯科医の作業時間が長くなっていた。 (Advantages of this embodiment)
As for the conventional needle-shaped root canal treatment instrument, as described above, a triangular prism-shaped or square prism-shaped metal material is screwed into the blade to form a helical blade along the length of the working part. A rake face exists only on the holding portion side due to the screwing. Therefore, when performing a treatment such as enlarging a root canal by holding a conventional needle-like root canal treatment instrument between the fingertips, the working portion is brought along the treatment target site such as the inner surface of the root canal, and the blade portion is twisted. The treatment must be performed while performing a rotating operation, such as turning along the direction of twisting. That is, even if the conventional needle-like root canal treatment instrument is advanced to the end of the root canal without being rotated, or if it is rotated so that the working part rotates in the opposite direction, the internal tissue of the tooth cannot be scraped, resulting in treatment. The working hours of the dentist who performed the procedure was getting longer.

そして、歯の内部組織を削り取るときに針状根管治療具を回転させるが、一方向のみに回転させることから歯状の削り痕が付き易く、この削り痕を整えるための新たな処置が必要となる。また、従来の針状根管治療具の作業部の部分を回転させる力が指先から保持部に適切に伝わるように、保持部にはゴム製や軟質合成樹脂製のグリップが配置されているが、グリップをゴム製や軟質の合成樹脂製の素材からなるものとしているので薬剤による消毒や加熱による消毒が行ない難く、清潔度を高く維持し難い。そのため、細菌に侵された歯の内部の血管や神経組織を取り除く処置を、従来の針状根管治療具を用いながら長い時間をかけて行なってしまうと、細菌による治療具の汚染度合いが高まったり、他の歯への汚染を招く可能性が生じる。 When the internal tissue of the tooth is scraped off, the needle-like root canal treatment instrument is rotated, but since it is rotated in only one direction, tooth-like shaving marks are likely to be left, and a new treatment is required to prepare these shaving marks. becomes. In addition, a grip made of rubber or soft synthetic resin is arranged in the holding part so that the force that rotates the working part of the conventional needle-like root canal treatment instrument is properly transmitted from the fingertip to the holding part. Since the grip is made of rubber or a soft synthetic resin material, it is difficult to sterilize with chemicals or heat, and it is difficult to maintain a high degree of cleanliness. Therefore, if the treatment to remove the blood vessels and nerve tissue inside the tooth affected by bacteria is performed for a long time while using a conventional needle-like root canal treatment instrument, the degree of contamination of the treatment instrument by bacteria becomes high. There is a possibility that it may lead to contamination of other teeth.

一方、本実施の形態での上記針状根管治療具１は作業部３の芯体５に処置部９を設け、この処置部９の治療具長さ方向の往復移動によって歯科治療対象部位に対する処置を行なうようにしたものであるので、治療具の長さ方向に沿った往復移動にて短時間で、例えば歯の内部の組織を削り取るなどの処置を実施することができるようになり、歯科医の労力を軽減させ、また細菌の広がりを抑えることができる。 On the other hand, the needle-shaped root canal treatment instrument 1 according to the present embodiment is provided with the treatment portion 9 on the core body 5 of the working portion 3, and the reciprocating movement of the treatment portion 9 in the longitudinal direction of the treatment instrument causes the dental treatment target site to move. Since it is designed to perform treatment, it is possible to perform treatment such as scraping tissue inside the tooth in a short time by reciprocating the treatment tool along the length direction. It can reduce the labor of doctors and suppress the spread of bacteria.

さらに本実施の形態における上記歯科治療器具１２では、取り付けられた上記針状根管治療具を、例えば往復移動が毎分５０００回となる動作制御の下で動作させるなど、歯科医の指先操作では実施できない動作にて歯に対する処置を行なうことが可能となり、根管治療に要する時間を短縮させることができる。そして、この歯科治療器具１２に取り付けられた針状根管治療具１は往復移動するものであるので、例えば処置部が刃板からなるものであれば線状の動きによって処置対象部位を滑らかな面に形成でき、押圧体の押し込み面による押し込みを行なわせるものであれば、処置面を平らに形成したり、消毒剤や治療薬を瞬時に詰め込むことができる。よって、治療具支持部を奥行き方向に沿って往復移動させる歯科治療器具に、長さ方向に沿う往復移動によって根管治療での処置を行なうことができる針状根管治療具を用いることが好適である。 Furthermore, in the dental treatment instrument 12 of the present embodiment, the attached needle-like root canal treatment instrument can be operated under operation control such that the reciprocating motion is 5000 times per minute, for example, by fingertip operation of the dentist. It is possible to treat the tooth with an operation that cannot be performed, and the time required for root canal treatment can be shortened. Since the needle-like root canal treatment instrument 1 attached to the dental treatment instrument 12 reciprocates, for example, if the treatment portion is made of a blade plate, the treatment target site can be smoothly moved by linear movement. If it can be formed on a surface and the pressing surface of the pressing body is used for pressing, the treatment surface can be formed flat, and the disinfectant or therapeutic agent can be filled instantly. Therefore, it is preferable to use a needle-like root canal treatment instrument that can perform root canal treatment by reciprocating movement along the length direction as a dental treatment instrument that reciprocates the treatment instrument support portion along the depth direction. is.

さらに根管治療に係る治療時間を従来に比べて短かくできるとともに、歯科医が今まで自身の指先操作で針状根管治療具を回転させるという手技を原因とする腱鞘炎の発生を抑えることができる。 Furthermore, the treatment time for root canal treatment can be shortened compared to the conventional method, and the occurrence of tenosynovitis caused by the procedure of rotating the needle-shaped root canal treatment instrument by the dentist's own fingertip operation can be suppressed. can.

１…針状根管治療具
２…保持部
２ａ…取付穴
２ｂ…丸面部
３…作業部
４…グリップ
５…芯体
６…刃板
７…刃部
９…処置部
１０…押し込み面
１１…押圧体
１２…歯科治療器具
１３…治療具側ハウジング
１４…把持側ハウジング
１５…ケース
１６…治療具支持部
１７…連結シャフト
１８…駆動部
２１…鶴首部
２２…第一の通路
２３…第二の通路
２５…出力シャフト
２６…支持部本体
２９…装着穴
３０…蓋体
３１…溝部
３２…先端面
３３…第一側壁
３４…第二側壁
３５…移動規制用突部
３６…ライン状溝
３７…突部
Ａ…奥行き方向 DESCRIPTION OF SYMBOLS 1... Needle-shaped root canal treatment tool 2... Holding part 2a... Mounting hole 2b... Round surface part 3... Working part 4... Grip 5... Core body 6... Blade plate 7... Blade part 9... Treatment part 10... Pushing surface 11... Pressing Body 12 Dental treatment instrument 13 Treatment tool side housing 14 Holding side housing 15 Case 16 Treatment tool support 17 Connection shaft 18 Driving part 21 Crane neck 22 First passage 23 Second passage DESCRIPTION OF SYMBOLS 25... Output shaft 26... Support part main body 29... Mounting hole 30... Cover body 31... Groove part 32... Tip surface 33... First side wall 34... Second side wall 35... Movement control protrusion 36... Line-shaped groove 37... Protrusion A... Depth direction

（請求項１の発明）
本発明は上記課題を考慮してなされたもので、保持部（２）とこの保持部（２）に連続する作業部（３）とからなる針状根管治療具（１）において、
作業部（３）の芯体（５）に、治療具長さ方向の往復移動によって歯科治療対象部位に対する処置を行なう処置部（９）が作業部長さ方向に沿って複数にして設けられていて、
前記処置部（９）は、作業部（３）の芯体（５）の外面に芯体（５）の径方向の外方に向けて張り出ていて、張り出し端縁を刃部（７）とし作業部長さ方向に間隔を置いて配置された刃板（６）であり、
前記刃板（６）の芯体径方向への張り出し寸法を作業部（３）の先端に向けて進むに従って小さくしていることを特徴とする針状根管治療具を提供して、上記課題を解消するものである。 (Invention of Claim 1)
The present invention has been made in consideration of the above problems, and a needle-shaped root canal treatment instrument (1) comprising a holding portion (2) and a working portion (3) connected to the holding portion (2),
A core body (5) of the working part (3) is provided with a plurality of treatment parts (9) along the length direction of the working part for performing treatment on a site to be treated by reciprocating movement in the length direction of the treatment tool. ,
The treatment portion (9) protrudes radially outward of the core body (5) from the outer surface of the core body (5) of the working portion (3). and blade plates (6) spaced apart in the longitudinal direction of the working length,
Provided is a needle-like root canal treatment instrument characterized in that the length of projection of the blade plate (6) in the radial direction of the core is reduced toward the distal end of the working portion (3). is to eliminate

（請求項２の発明）
そして、請求項１の発明において、刃板（６）での針状根管治療器具長さ方向で相対する面それぞれがすくい面（８）であることが可能である。 (Invention of Claim 2)
In the first aspect of the invention, the faces of the blade plate (6) facing each other in the longitudinal direction of the needle-like root canal treatment instrument can be rake faces (8) .

（請求項３の発明）
また、請求項１または２の発明において、刃板（６）は、
作業部長さ方向に亘って芯体（５）の周囲を廻る螺旋状の配置にして設けられ、
または、芯体（５）の周囲を廻る環状の配置であって、この環状の刃板（６）が作業部長さ方向に多段の配置にして設けられていることが可能である。 (Invention of Claim 3)
Further, in the invention of claim 1 or 2 , the blade plate (6) is
provided in a helical arrangement around the core body (5) over the length of the working part,
Alternatively, it is possible to have an annular arrangement around the core body (5) and to have the annular blade plates (6) arranged in multiple stages in the working length direction .

（請求項４の発明）
また、もう一つの発明は、請求項１から３の何れか一項に記載の針状根管治療具（１）と、前記針状根管治療具（１）の長さ方向を奥行き方向（Ａ）とする装着穴（２９）を有していて、この装着穴（２９）に針状根管治療具（１）の保持部（２）が挿入されて針状根管治療具（１）を支持し、かつ針状根管治療具（１）の前記作業部（３）が露出する治療具支持部（１６）と、先端面（３２）を前記治療具支持部（１６）側に臨ませて、前記治療具支持部（１６）と連結する連結シャフト（１７）と、前記連結シャフト（１７）を回転させる駆動部（１８）とを備え、
前記治療具支持部（１６）は、前記連結シャフト（１７）と相対する所定位置にこの治療具支持部（１６）の幅方向に形成された溝部（３１）を備え、
前記溝部（３１）は、治療具支持部（１６）の前記奥行き方向（Ａ）の一方側に形成された第一側壁（３３）と、治療具支持部（１６）の前記奥行き方向（Ａ）での他方側に形成された第二側壁（３４）とを備え、
前記連結シャフト（１７）は、前記先端面（３２）の中心から偏倚して配置される突部（３７）を備え、
前記治療具支持部（１６）に連結された連結シャフト（１７）の前記突部（３７）が、前記溝部（３１）に配置されていて、
前記連結シャフト（１７）が、前記駆動部（１８）の動作で回転して、この連結シャフト（１７）の回転によって前記先端面（３２）の中心周りを旋回する突部（３７）が、前記溝部（３１）の前記第一側壁（３３）及び前記第二側壁（３４）と接触してこれらを押圧し、治療具支持部（１６）をこの治療具支持部（１６）の前記奥行き方向（Ａ）に沿って往復移動させることを特徴とする歯科治療器具であり、この歯科治療器具を提供して、上記課題を解消するものである。 (Invention of claim 4)
Another invention is the needle-like root canal treatment tool (1) according to any one of claims 1 to 3, and the length direction of the needle-like root canal treatment tool (1) is set in the depth direction ( A) has a mounting hole (29), and the holding portion (2) of the needle-like root canal treatment device (1) is inserted into the mounting hole (29) to hold the needle-like root canal treatment device (1). and a treatment instrument support portion (16) exposing the working portion (3) of the needle-like root canal treatment instrument (1), and a distal end surface (32) facing the treatment instrument support portion (16). and a connecting shaft (17) connected to the treatment instrument support part (16); and a driving part (18) for rotating the connecting shaft (17),
The treatment instrument support part (16) has a groove part (31) formed in the width direction of the treatment instrument support part (16) at a predetermined position facing the connection shaft (17),
The groove (31) includes a first side wall (33) formed on one side of the treatment instrument support (16) in the depth direction (A), and a first side wall (33) formed on one side of the treatment instrument support (16) in the depth direction (A). a second sidewall (34) formed on the other side of the
The connecting shaft (17) has a protrusion (37) that is displaced from the center of the tip surface (32),
The projection (37) of the connecting shaft (17) connected to the treatment instrument support (16) is arranged in the groove (31),
The connecting shaft (17) rotates by the operation of the driving part (18), and the rotation of the connecting shaft (17) rotates the projection (37) around the center of the tip surface (32). The first side wall (33) and the second side wall (34) of the groove (31) are brought into contact with each other and pressed to move the treatment tool support part (16) in the depth direction ( A) is a dental treatment instrument characterized by reciprocating movement along A), and this dental treatment instrument is provided to solve the above problems .

（請求項５の発明）
そして請求項４の発明において、前記突部（３７）は、前記溝部（３１）内に配置される際、前記第一側壁（３３）と前記第二側壁（３４）との双方に摺接可能に接触することが良好である。 (Invention of claim 5)
In the fourth aspect of the invention, the protrusion (37) is slidably contactable with both the first side wall (33) and the second side wall (34) when arranged in the groove (31). It is good to be in contact with

（請求項６の発明）
また、請求項４または５の発明において、前記治療具支持部（１６）の前記奥行き方向（Ａ）に沿って形成される第一の通路（２２）と、前記奥行き方向（Ａ）に交差する方向に沿って形成されて前記第一の通路（２２）に連通する第二の通路（２３）とを備えるハウジング（１３）を更に備え、
前記治療具支持部（１６）は、前記第一の通路（２２）内に配置され、
前記連結シャフト（１７）は、前記第二の通路（２３）内に配置され、
前記第一の通路（２２）の内壁に、治療具支持部（１６）の前記奥行き方向（Ａ）に沿うライン状溝（３６）が形成され、
前記治療具支持部（１６）は、前記ライン状溝（３６）と相対する所定位置に、前記ライン状溝（３６）と略同幅で、前記治療具支持部（１６）が往復移動する方向を前記奥行き方向（Ａ）に規制する移動規制用突部（３５）を備えているものとすることが良好である。 (Invention of claim 6)
Further , in the invention of claim 4 or 5, the first passage (22) formed along the depth direction (A) of the treatment instrument support portion (16) intersects the depth direction (A). further comprising a housing (13) comprising a second passageway (23) formed along a direction and communicating with the first passageway (22);
The therapeutic device support (16) is disposed within the first passageway (22),
said connecting shaft (17) is arranged in said second passageway (23),
A linear groove (36) is formed in the inner wall of the first passage (22) along the depth direction (A) of the treatment instrument support (16),
The therapeutic instrument support part (16) is positioned at a predetermined position facing the linear groove (36) and has substantially the same width as the linear groove (36) in the direction in which the therapeutic instrument support part (16) reciprocates. It is preferable to provide a movement restricting protrusion (35) that restricts the movement in the depth direction (A) .

（請求項７の発明）
また、請求項４から６の何れか一項の発明において、前記治療具支持部（１６）は座金（３０ａ）を介してねじ付ける蓋体（３０）を有していて、前記蓋体（３０）が、治療具支持部（１６）に挿入された針状根管治療具（１）の前記保持部（２）を支持することが良好である。 (Invention of claim 7)
In the invention according to any one of claims 4 to 6, the treatment instrument support part (16) has a cover (30) screwed through a washer (30a), and the cover (30) is screwed through a washer (30a). ) supports the holding part (2) of the needle-like root canal treatment instrument (1) inserted into the treatment instrument support part (16) .

（刃板の配置の他例）
上記実施の形態では刃板６を螺旋状の配置としたが、本発明の針状根管治療具はこの例に限定されるものではない。図２は他の例をしていて、この図２に示す針状根管治療具１では、作業部３の刃板６（処置部９）を芯体５の周囲を廻る環状の配置にし、環状の刃板６が作業部３の長さ方向に間隔を置いて多段にして設けられている。そして、上記例と同様に複数の刃板６の径方向への張り出し寸法は作業部３の先端に進むに従って徐々に小さく、保持部２側となる刃板６の張り出し端縁の位置と先端側の刃板６の張り出し端縁の位置とを結んだ線が直線とされて、側方から見たときに作業部３の側面視形状が鋭く細長い三角形状とされているものである。 (Other examples of arrangement of blade plates)
Although the blade plate 6 is arranged in a spiral shape in the above embodiment, the needle-like root canal treatment instrument of the present invention is not limited to this example. FIG. 2 shows another example. In the needle-like root canal treatment instrument 1 shown in FIG. Annular blade plates 6 are provided in multiple stages at intervals in the length direction of the working portion 3 . As in the above example, the radial extension of the plurality of blade plates 6 gradually decreases toward the tip of the working portion 3. The line connecting the position of the projecting edge of the blade plate 6 is a straight line, and the side view shape of the working part 3 is sharp and elongated triangular shape when viewed from the side.

Claims

In a needle-like root canal treatment instrument (1) comprising a holding part (2) and a working part (3) continuous with the holding part (2), a core body (5) of the working part (3) is provided with a treatment instrument length. 1. A needle-like root canal treatment instrument, comprising a treatment section (9) for performing treatment on a site to be treated by reciprocating in a longitudinal direction.

The treatment portion (9) protrudes radially outward from the outer surface of the core (5) of the working portion (3), and the protruding edge serves as the blade portion (7). a blade plate (6) which is arranged in a helical arrangement around the core body (5) over the length of the working length or radially of the core body (5). The blade plates (6) protruding outward are arranged in an annular manner around the core body (5), and the annular blade plates (6) are provided in multiple stages in the longitudinal direction of the working portion. Item 1. The needle-like root canal treatment instrument according to item 1.

The treatment section (9) is arranged at the tip of the core body (5) of the working section (3) and has a pressing body (5) whose tip portion serves as a pressing surface (10) and has a larger diameter than the core body (5). 11) The needle-like root canal treatment instrument according to claim 1.

A mounting hole (2a) is bored in the holder (2), an end of the working part (3) is fitted into the mounting hole (2a), and the holding part (2) and the working part (3) 4. The needle-like root canal treatment instrument according to any one of claims 1 to 3, wherein the and are integrated with each other via a bonding material.

5. Any one of claims 1 to 4, wherein a round surface portion (2b) having rounded corners in a cross-sectional shape along the longitudinal direction of the treatment instrument is provided on the outer peripheral end of the holding portion (2) on the side of the working portion (3). 1. The needle-like root canal treatment instrument according to item 1.

The needle-like root canal treatment device (1) according to any one of claims 1 to 5, and a mounting hole (29) in which the length direction of the needle-like root canal treatment device (1) is the depth direction (A). ), the holding portion (2) of the needle-like root canal treatment instrument (1) is inserted into the mounting hole (29) to support the needle-like root canal treatment instrument (1), and The treatment tool support part (16) where the working part (3) of the tube treatment tool (1) is exposed, and the treatment tool support part (16) facing the treatment tool support part (16) side. A connecting shaft (17) connected to (16), and a driving part (18) for rotating the connecting shaft (17),
The treatment instrument support part (16) has a groove part (31) formed in the width direction of the treatment instrument support part (16) at a predetermined position facing the connection shaft (17),
The groove (31) includes a first side wall (33) formed on one side of the treatment instrument support (16) in the depth direction (A), and a first side wall (33) formed on one side of the treatment instrument support (16) in the depth direction (A). a second sidewall (34) formed on the other side of the
The connecting shaft (17) has a protrusion (37) that is displaced from the center of the tip surface (32),
The projection (37) of the connecting shaft (17) connected to the treatment instrument support (16) is arranged in the groove (31),
The connecting shaft (17) rotates by the operation of the driving part (18), and the rotation of the connecting shaft (17) rotates the projection (37) around the center of the tip surface (32). The first side wall (33) and the second side wall (34) of the groove (31) are brought into contact with each other and pressed to move the treatment tool support part (16) in the depth direction ( A) A dental treatment instrument characterized by reciprocating movement along A).

7. The projection (37) according to claim 6, wherein the projection (37) contacts both the first side wall (33) and the second side wall (34) so as to be slidable when arranged in the groove (31). dental care instruments.

A first passageway (22) formed along the depth direction (A) of the treatment instrument support portion (16) and the first passageway (22) formed along a direction crossing the depth direction (A) further comprising a housing (13) comprising a second passageway (23) communicating with the passageway (22);
The therapeutic device support (16) is disposed within the first passageway (22),
said connecting shaft (17) is arranged in said second passageway (23),
A linear groove (36) is formed in the inner wall of the first passage (22) along the depth direction (A) of the treatment instrument support (16),
The therapeutic instrument support part (16) is positioned at a predetermined position facing the linear groove (36) and has substantially the same width as the linear groove (36) in the direction in which the therapeutic instrument support part (16) reciprocates. 8. The dental treatment instrument according to claim 6 or 7, further comprising a movement restricting projection (35) that restricts the movement in the depth direction (A).

The treatment instrument support part (16) has a cover (30) screwed through a washer (30a), and the cover (30) is a needle-shaped needle inserted into the treatment instrument support part (16). 9. A dental treatment instrument according to any one of claims 6 to 8, supporting the holding part (2) of a root canal treatment instrument (1).