JP3979915B2 - Osteosynthesis device - Google Patents

Osteosynthesis device Download PDF

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JP3979915B2
JP3979915B2 JP2002296836A JP2002296836A JP3979915B2 JP 3979915 B2 JP3979915 B2 JP 3979915B2 JP 2002296836 A JP2002296836 A JP 2002296836A JP 2002296836 A JP2002296836 A JP 2002296836A JP 3979915 B2 JP3979915 B2 JP 3979915B2
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screw
sleeve
hole
screwed
intramedullary nail
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JP2004129808A (en
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喜久二 堀内
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株式会社ホリックス
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/74—Devices for the head or neck or trochanter of the femur
    • A61B17/742—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck
    • A61B17/744—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck the longitudinal elements coupled to an intramedullary nail

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
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  • Surgical Instruments (AREA)

Description

【０００１】
【発明が属する技術分野】
本発明は、例えば、大腿骨の頚部骨折時に骨折した部分を接合するために使用される骨接合装置に係り、特に、骨髄内に骨髄内釘を挿入・配置するタイプにおいて、接合作業の作業性の向上、接合状態の強固な維持を図ることができるように工夫したものに関する。
【０００２】
この種の骨接合装置を開示するものとして、骨髄内釘、セルフドリリング／セルフカッティングネジ、スリーブから構成されたものがある（例えば、特許文献１参照）。これは、接合後に時間の経過に伴って骨が硬化していき、それによって、骨に螺合されているセルフドリリング／セルフカッティングネジの骨髄内釘に対する位置が変化することになる。そこで、上記スリーブを骨髄内釘に螺合・固定しておくと共に、上記セルフドリリング／セルフカッティングネジをスリーブの内周側に移動可能な状態で配置した構成としたものである。このように構成することにより、上記セルフドリリング／セルフカッティングネジの骨髄内釘に対する位置変化を吸収することができ、いわゆる動的な骨の接合を可能にしているものである。
【０００３】
【特許文献１】
特開平７−３１３５２４号公報
【０００４】
【発明が解決しようとする課題】
上記従来の構成によると次のような問題があった。
すなわち、上記特許文献１に記載された発明の場合には、まず、骨髄内に骨髄内釘を挿入・配置し、そこに形成された貫通孔内にネジを挿入して骨に螺合させていく。そして、上記貫通孔とネジの隙間を埋めるようにスリーブを螺合させていくわけであるが、その作業が面倒であるという問題があった。
又、スリーブの螺合状態が経時変化によって緩むことが懸念されていた。
【０００５】
本発明はこのような点に基づいてなされたものでその目的とするところは、骨接合作業の作業性を向上させ、且つ、強固な接合状態を維持することを可能にする骨接合装置を提供することにある。
【０００６】
【課題を解決するための手段】
上記目的を達成するべく本願発明による骨接合装置は、骨髄内に挿入・配置されると共に開口縁部が傾斜面になるように斜め方向に指向した状態で形成された貫通孔を備え該貫通孔内に雌ねじ部を形成した骨髄内釘と、上記骨髄内釘の貫通孔内に挿入され接合対象の骨に螺合されるラグスクリュと、上記ラグスクリュの外周側に軸方向に移動可能な状態で予め外装され抜け止め処理されていると共に上記貫通孔の雌ねじ部に螺合される雄ねじ部を備えたスリーブと、を具備し、上記スリーブは雄ねじ部の基端側にストッパ部を備えていて、該ストッパ部が貫通孔の開口縁部に当接することによりそれ以上の螺合が規制されるように構成されていて、上記ストッパ部は雄ねじ側の端から反雄ねじ側の端に向けてその径を拡大させていくようなテーパ形状になっていることを特徴とするものである。
【０００７】
すなわち、本願発明による接合装置の場合には、骨髄内に挿入・配置されると共に貫通孔を備え該貫通孔内に雌ねじ部を形成した骨髄内釘材と、上記骨髄内釘の貫通孔内に挿入され接合対象の骨に螺合されるラグスクリュと、上記ラグスクリュの外周側に予め外装されて軸方向に移動可能な状態で抜け止め処理されていて貫通孔の雌ねじ部に螺合される雄ねじ部を備えたスリーブと、を具備したものであり、つまり、ラグスクリュとスリーブとを予め組み込んでスリーブの抜け防止処理を施したものであり、それによって、取扱が容易になり、接合作業の容易化を図ることができるものである。
その際、スリーブを雄ねじ部の基端側にストッパ部を備えた構成とした場合には、該ストッパ部が骨髄内釘側の貫通孔の縁部に当接することにより、それ以上の螺合量を規制することができ、それによって、スリーブの位置が自動的に規定されることになる。よって、接合作業がさらに簡単なものとなる。
又、ストッパ部を反雄ねじ側に向けてその径を拡大させていくようなテーパ形状に形成した場合には、該テーパ形状部が効果的に機能してロック状態を得ることができ、スリーブの強固な螺合状態を提供することができる。
【０００８】
【発明の実施の形態】
以下、図１乃至図８を参照して本発明の一実施の形態を説明する。図１、図２は大腿骨１の頚部１ａに発生した骨折部Ａを本実施の形態による骨接合装置３によって接合しようとする様子を順番に示した図である。
【０００９】
以下、上記骨接合装置３の構成を詳細に説明していく。
まず、大腿骨１の骨髄内に挿入・固定される骨髄内釘５があり、この骨髄内釘５は、基端側（図１中上部）を大径部７とし、先端側（図１中下部）を小径部９としている。上記大径部７の上端部には、図７にも示すように、凹部１１が形成されていて、この凹部１１には雌ねじ部１３が形成されている。又、図３、図４、図７に示すように、上記大径部７の上端部には１８０°の位置に切欠部１５、１７が形成されている。これら両切欠部１５、１７には図示しないピン状冶具が嵌め込まれることになり、それによって、骨髄内釘５の不用意な回転を規制するものである。
【００１０】
上記大径部７には、貫通孔１９と２１が軸方向に所定の間隔を存した状態で、且つ、斜め（例えば、貫通孔釘５との角度が１３５°）に指向した状態で穿孔されている。上記貫通孔１９には固定ねじ部材３６が貫通・配置され、大腿骨１の頚部１ａに螺合されることになる。又、上記貫通孔２１内には、図３及び図４に示すように、雌ねじ部２３が形成されている。又、骨髄内釘５の小径部９には、図３及び図４に示すように、溝２５、２７が１８０°の位置に対向するように形成されている。これら両溝２５、２７の縁部が大腿骨１に食い込むことなり、それによって、骨髄内釘５の不用意な回転を規制するものである。又、これら溝２５、２７には軸方向の所定個所に貫通孔２９、３１が穿孔されている。これら貫通孔２９、３１内には、図１及び図２に示すように、固定ねじ部材３３、３５が貫通・配置されて、大腿骨１に螺合されることになる。
【００１１】
上記貫通孔２１内には接合用ねじ具３７が貫通・配置されている。上記接合用ねじ具３７は、図６にも示すように、ラグスクリュ３９と、このラグスクリュ３９の基部に固着された端部材４１と、上記ラグスクリュ３９の外周側に移動可能に外装されたスリーブ４３とから構成されている。これらラグスクリュ３９、端部材４１、スリーブ４３は予め組み込まれて一体化されている。すなわち、端部材４１をラグスクリュ３９の基部に圧入・固定する前に、ラグスクリュ３９にスリーブ４３を外装する。次に、ラグスクリュ３９の基部に端部材４１を圧入・固定する。これによって、スリーブ４３のラグスクリュ３９からの抜けは防止され一体化されることになる。
【００１２】
上記ラグスクリュ３９は、中空状をなしていて、先端部に雄ねじ部４５を備えている。又、この雄ねじ部４５のねじ山部４７には複数個の切欠部４９が形成されていて、タップ機能が付与されている。つまり、図示しない工具によって回転されることにより、自身で大腿骨１の頚部１ａにねじ切りを施しながらそこに螺合していくものである。又、上記ラグスクリュ３９の上記雄ねじ部４５の反対側の端部には、既に説明したように、端部材４１が圧入・固定されている。
【００１３】
その構成を詳しく説明すると、図８に示すように、ラグスクリュ３９の端部はその外形が六角形に形成されている。一方、端部材４１の内径も六角形となっており、端部材４１の内径部をラグスクリュ３９の外形部に圧入して固定しているものである。又、ラグスクリュ３９の端部の内周面には雌ねじ部５７が形成されている。そこには、接合作業終了時に図示しないコンプレッションスクリュが螺合されることになり、それによって、ラグスクリュ３９ひいては骨折下側の頚部１ａ を引っ張って骨折部Ａを密着させるものである。又、上記端部材４１の六角形の内径部には図示しない六角レンチが差し込まれ、それによって、ラグスクリュ３９の螺合が行われる。又、スリーブ４３の内径部も六角形に形成されており、そこにも図示しない六角レンチが差し込まれ、それによって、スリーブ４３の螺合が行われることになる。
【００１４】
又、上記スリーブ４３であるが、図６にも示すように、雄ねじ部５３と、ストッパ部５５とから構成されている。上記雄ねじ部５３は軸部３の貫通孔２１内に形成された雌ねじ部２３に螺合することになる。又、ストッパ部５５は貫通孔２１の縁部に当接して、スリーブ４３のそれ以上の螺合を規制する機能を発揮するものである。又、上記ストッパ部５５は、その外径が反雄ねじ部５３方向に向けて徐々に拡大されるようなテーパ形状に形成されている。このテーパ形状部の機能によって、スリーブ４３を雌ねじ部２３に螺合させていくときに、所望のロック状態、すなわち、テープ形状部が効果的に食い込んで、スリーブ４３の雌ねじ部２３に対する強固な螺合状態を提供するものである。
【００１５】
以上の構成を基にその作用を説明する。
まず、接合用ねじ具３７を予め用意しておく。すなわち、ラグスクリュ３９にスリーブ４３を外装し、その状態でラグスクリュ３９の端部に端部材４１を圧入・固定する。これによって、スリーブ４３の抜けを防止した状態の接合用ねじ具３７を得ることができる。
【００１６】
次に、大腿骨１の髄管内に骨髄内釘５を挿入・配置する。次に、上記接合用ねじ具３７のラグスクリュ３９を上記骨髄内釘４１の貫通孔２１内に挿入していくと共に大腿骨１の頚部１ａに予め形成されている図示しない雌ねじ部に螺合させていく。その際、スリーブ４３は貫通孔２１の雌ねじ部２３に螺合されることになり、ストッパ部５５が貫通孔２１の縁部に当接したところでそれ以上の螺合が規制される。その状態を示すのが図１である。
【００１７】
次に、図１に示す状態からラグスクリュ３９をさらに大腿骨１の頚部１ａ側に螺合させていく。このときには、ラグスクリュ３９の雄ねじ部４５のねじ山部４７に形成された複数個の切欠部４９によってタップ機能が発揮され、つまり、自身でねじ切りを行いながらそこに螺合していくものである。そして、図２に示すような状態になる。
【００１８】
後は、図示しないコンプレッションスクリュをラグスクリュ３９の基部側に螺合させることにより、ラグスクリュ３９ひいては頚部１ａの骨折側を大腿骨１側に引っ張って骨折部を接合する。
【００１９】
以上本実施の形態によると次のような効果を奏することができる。
まず、接合用ねじ具３７を構成するラグスクリュ３９と、端部材４１と、スリーブ４３とが予め一体化されていて、スリーブ４３のラグスクリュ３９からの抜けが防止されるように構成されているので、接合作業時の取扱が容易であり、それによって、接合作業に要する時間を短縮させることができる。
又、スリーブ４３はストッパ部５５を備えた構成になっており、該ストッパ部５５によってスリーブ４３の螺合量を一定量に規制しているので、スリーブ４３の位置は自動的に決定され、それによっても接合作業時の作業性を向上させて時間を短縮させることができるものである。
又、ストッパ部５５はテーパ形状に形成されているので、スリーブ４３を雌ねじ部２３に螺合させて、ストッパ部５５が骨髄内釘５の貫通孔２１の縁部に当接したとき、テーパ形状部の食い込みにより強固な螺合状態を売ることができ、又、その後の不用意な緩みを防止することができる。
【００２０】
尚、本発明は前記一実施の形態に限定されるものではない。
前記一実施の形態では、大腿骨の頚部に骨折が発生し、その骨折部を接合する場合を例に挙げて説明しているが、それに限定されるものではなく、様々な骨折部の接合に使用することができる。
又、前記一実施の形態の場合には、ラグスクリュとスリーブからなる接合ねじ具が一組の場合を例に挙げて説明しているが、それが二組以上であってもよい。
その他図示した構成はあくまで一例である。
【００２１】
【発明の効果】
以上詳述したように本発明による骨接合装置によると、まず、接合用ねじ具を構成するラグスクリュスリーブとが予め一体化されていて、スリーブのラグスクリュからの抜けが防止されるように構成されているので、接合作業時の取扱が容易であり、それによって、接合作業に要する時間を短縮させることができる。
又、スリーブがストッパ部を備えた構成とした場合には、該ストッパ部によってスリーブの螺合量を一定量に規制しているので、スリーブの位置は自動的に決定され、それによっても接合作業時の作業性を向上させて時間を短縮させることができるものである。
又、ストッパ部を反雄ねじ側に向けてその径を拡大させていくようなテーパ形状に形成した場合には、該テーパ形状部が効果的に機能してロック状態を得ることができ、スリーブの強固な螺合状態を提供することができる。
【図面の簡単な説明】
【図１】本発明の一実施の形態を示す図で、骨接合装置の構成を示す正面図である。
【図２】本発明の一実施の形態を示す図で、骨接合装置のラグスクリュを螺合させた状態を示す正面図である。
【図３】本発明の一実施の形態を示す図で、骨髄内釘の正面図である。
【図４】本発明の一実施の形態を示す図で、骨髄内釘の背面図である。
【図５】本発明の一実施の形態を示す図で、骨髄内釘の側面図である。
【図６】本発明の一実施の形態を示す図で、接合用ねじ具の正面図である。
【図７】本発明の一実施の形態を示す図で、図５のＶＩＩ−ＶＩＩ矢視図である。
【図８】本発明の一実施の形態を示す図で、図６のＶＩＩＩ−ＶＩＩＩ矢視図である。
【符号の説明】
１ 大腿骨
１ａ 大腿骨の頚部
３ 骨接合装置
５ 骨髄内釘
７ 大径部
９ 小径部
２１ 貫通孔
２３ 雌ねじ部
３７ 接合ねじ具
３９ ラグスクリュ
４１ 端部材
４３ スリーブ
５３ 雄ねじ部
５５ ストッパ部[0001]
[Technical field to which the invention belongs]
The present invention relates to an osteosynthesis device used for joining a fractured part of a femur, for example, at the time of fracture of a neck, and in particular, in a type in which an intramedullary nail is inserted and arranged in the bone marrow, the workability of the joining work It is related with what was devised so that the improvement of this and the solid maintenance of a joining state could be aimed at.
[0002]
As this type of osteosynthesis device, there is a device composed of an intramedullary nail, a self-drilling / self-cutting screw, and a sleeve (see, for example, Patent Document 1). This means that the bone hardens with time after joining, thereby changing the position of the self-drilling / self-cutting screw screwed into the bone relative to the intramedullary nail. Therefore, the sleeve is screwed and fixed to the intramedullary nail, and the self-drilling / self-cutting screw is arranged to be movable to the inner peripheral side of the sleeve. With this configuration, the position change of the self-drilling / self-cutting screw with respect to the intramedullary nail can be absorbed, and so-called dynamic bone joining is enabled.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 7-313524
[Problems to be solved by the invention]
The conventional configuration has the following problems.
That is, in the case of the invention described in Patent Document 1, first, an intramedullary nail is inserted and arranged in the bone marrow, and a screw is inserted into a through-hole formed therein to be screwed into the bone. Go. And although a sleeve is screwed together so that the clearance gap between the said through-hole and a screw may be filled, there existed a problem that the operation | work was troublesome.
In addition, there has been a concern that the screwed state of the sleeve may be loosened with time.
[0005]
The present invention has been made based on such points, and an object of the present invention is to provide an osteosynthesis device capable of improving the workability of osteosynthesis and maintaining a strong joint state. There is to do.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an osteosynthesis device according to the present invention comprises a through-hole that is inserted and arranged in the bone marrow and is oriented in an oblique direction so that the opening edge is an inclined surface. An intramedullary nail in which a female thread portion is formed, a lag screw inserted into a through-hole of the intramedullary nail and screwed into a bone to be joined, and in an axially movable state on the outer peripheral side of the lag screw A sleeve provided with a male screw portion that is externally mounted and is screwed into the female screw portion of the through hole, and the sleeve includes a stopper portion on the proximal end side of the male screw portion, The stopper is configured so that further screwing is restricted by coming into contact with the opening edge of the through hole, and the diameter of the stopper is increased from the end on the male screw side toward the end on the anti-male screw side. Te that seems to expand And it is characterized in that has a path shape.
[0007]
That is, in the case of the joining device according to the present invention, the intramedullary nail material inserted and arranged in the bone marrow and having a through hole and having a female thread portion formed in the through hole, and the through hole of the intramedullary nail A lug screw that is inserted and screwed into the bone to be joined, and a male screw part that is pre-sealed on the outer peripheral side of the lug screw and is secured to the axially movable state and is screwed into the female screw part of the through hole In other words, the sleeve is provided with a lug screw and a sleeve in advance to prevent the sleeve from coming off, thereby facilitating handling and facilitating the joining work. It can be planned.
At that time, when the sleeve is configured to have a stopper portion on the proximal end side of the male screw portion, the stopper portion abuts on the edge of the through hole on the intramedullary nail side, so that a further screwing amount is obtained. The position of the sleeve is automatically defined. Therefore, the joining operation is further simplified.
In addition, when the stopper portion is formed in a tapered shape that increases its diameter toward the anti-male screw side, the tapered portion can effectively function to obtain a locked state. A strong screwed state can be provided.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 and FIG. 2 are diagrams sequentially showing a state in which a fracture portion A generated in the neck 1a of the femur 1 is to be joined by the osteosynthesis device 3 according to the present embodiment.
[0009]
Hereinafter, the configuration of the osteosynthesis device 3 will be described in detail.
First, there is an intramedullary nail 5 to be inserted and fixed in the bone marrow of the femur 1, and this intramedullary nail 5 has a proximal end side (upper part in FIG. 1) as a large diameter part 7 and a distal end side (in FIG. 1). The lower portion is the small diameter portion 9. As shown in FIG. 7, a concave portion 11 is formed at the upper end portion of the large diameter portion 7, and a female screw portion 13 is formed in the concave portion 11. Further, as shown in FIGS. 3, 4, and 7, notches 15 and 17 are formed in the upper end portion of the large diameter portion 7 at a position of 180 °. A pin-shaped jig (not shown) is fitted into both the notches 15 and 17, thereby restricting inadvertent rotation of the intramedullary nail 5.
[0010]
The large-diameter portion 7 is perforated with through holes 19 and 21 at a predetermined interval in the axial direction and obliquely oriented (for example, an angle with the through-hole nail 5 is 135 °). ing. A fixing screw member 36 is passed through the through hole 19 and is screwed into the neck 1 a of the femur 1. Further, as shown in FIGS. 3 and 4, a female screw portion 23 is formed in the through hole 21. Further, as shown in FIGS. 3 and 4, grooves 25 and 27 are formed in the small-diameter portion 9 of the intramedullary nail 5 so as to face the position of 180 °. The edges of both grooves 25 and 27 bite into the femur 1, thereby restricting inadvertent rotation of the intramedullary nail 5. In addition, through holes 29 and 31 are formed in the grooves 25 and 27 at predetermined positions in the axial direction. As shown in FIGS. 1 and 2, fixing screw members 33 and 35 are inserted and inserted into the through holes 29 and 31 and screwed into the femur 1.
[0011]
In the through hole 21, a joining screw tool 37 is inserted and arranged. As shown in FIG. 6, the joining screw tool 37 includes a lug screw 39, an end member 41 fixed to the base portion of the lug screw 39, and a sleeve 43 that is movably mounted on the outer peripheral side of the lug screw 39. It is composed of The lug screw 39, the end member 41, and the sleeve 43 are integrated in advance and integrated. That is, before the end member 41 is press-fitted and fixed to the base portion of the lug screw 39, the sleeve 43 is externally attached to the lug screw 39. Next, the end member 41 is press-fitted and fixed to the base of the lug screw 39. As a result, the sleeve 43 is prevented from coming off from the lug screw 39 and integrated.
[0012]
The lug screw 39 has a hollow shape and is provided with a male screw portion 45 at the tip. A plurality of notches 49 are formed in the thread 47 of the male thread 45, and a tap function is provided. That is, by being rotated by a tool (not shown), the neck 1a of the femur 1 is threaded while being threaded. Further, as already described, the end member 41 is press-fitted and fixed to the end of the lug screw 39 opposite to the male screw portion 45.
[0013]
The configuration will be described in detail. As shown in FIG. 8, the outer end of the lug screw 39 has a hexagonal shape. On the other hand, the inner diameter of the end member 41 is also hexagonal, and the inner diameter portion of the end member 41 is press-fitted and fixed to the outer shape portion of the lug screw 39. A female screw portion 57 is formed on the inner peripheral surface of the end portion of the lug screw 39. A compression screw (not shown) is screwed there at the end of the joining operation, thereby pulling the lug screw 39 and the neck 1a below the fracture to bring the fracture A into close contact therewith. Further, a hexagonal wrench (not shown) is inserted into the hexagonal inner diameter portion of the end member 41, whereby the lug screw 39 is screwed. Further, the inner diameter portion of the sleeve 43 is also formed in a hexagonal shape, and a hexagonal wrench (not shown) is also inserted there, whereby the sleeve 43 is screwed.
[0014]
The sleeve 43 includes a male screw portion 53 and a stopper portion 55 as shown in FIG. The male screw portion 53 is screwed into a female screw portion 23 formed in the through hole 21 of the shaft portion 3. The stopper portion 55 abuts on the edge portion of the through hole 21 and exerts a function of restricting further screwing of the sleeve 43. Further, the stopper portion 55 is formed in a taper shape such that the outer diameter is gradually enlarged toward the anti-male screw portion 53 direction. When the sleeve 43 is screwed into the female screw portion 23 by the function of the taper-shaped portion, the desired locked state, that is, the tape-shaped portion effectively bites into the sleeve 43 and the screw 43 is firmly screwed into the female screw portion 23. It provides a combined state.
[0015]
The operation will be described based on the above configuration.
First, the joining screw tool 37 is prepared in advance. That is, the sleeve 43 is mounted on the lug screw 39, and the end member 41 is press-fitted and fixed to the end of the lug screw 39 in this state. Thereby, the joining screw tool 37 in a state in which the sleeve 43 is prevented from coming off can be obtained.
[0016]
Next, the intramedullary nail 5 is inserted and placed in the medullary canal of the femur 1. Next, the lug screw 39 of the joining screw tool 37 is inserted into the through-hole 21 of the intramedullary nail 41 and screwed into a female screw part (not shown) formed in the neck 1a of the femur 1 in advance. Go. At that time, the sleeve 43 is screwed into the female screw portion 23 of the through hole 21, and further screwing is restricted when the stopper portion 55 comes into contact with the edge portion of the through hole 21. FIG. 1 shows this state.
[0017]
Next, the lag screw 39 is further screwed to the neck 1a side of the femur 1 from the state shown in FIG. At this time, the tap function is exhibited by the plurality of notches 49 formed in the threaded portion 47 of the male threaded portion 45 of the lug screw 39, that is, it is screwed into the threaded portion while performing threading by itself. And it will be in a state as shown in FIG.
[0018]
Thereafter, a compression screw (not shown) is screwed to the base side of the lug screw 39, thereby pulling the fracture side of the lug screw 39 and thus the neck portion 1a to the femur 1 side to join the fracture portion.
[0019]
As described above, according to the present embodiment, the following effects can be obtained.
First, the lug screw 39, the end member 41, and the sleeve 43 constituting the joining screw tool 37 are integrated in advance so that the sleeve 43 is prevented from coming off from the lug screw 39. The handling at the time of joining work is easy, whereby the time required for joining work can be shortened.
Further, the sleeve 43 is configured to include a stopper portion 55, and the amount of screwing of the sleeve 43 is restricted to a fixed amount by the stopper portion 55, so the position of the sleeve 43 is automatically determined. Therefore, the workability at the time of joining work can be improved and the time can be shortened.
Further, since the stopper portion 55 is formed in a tapered shape, when the sleeve 43 is screwed into the female screw portion 23 and the stopper portion 55 comes into contact with the edge of the through-hole 21 of the intramedullary nail 5, the tapered shape is obtained. It is possible to sell a strong screwed state by biting the part, and to prevent subsequent inadvertent loosening.
[0020]
The present invention is not limited to the one embodiment.
In the above-described embodiment, the case where a fracture occurs in the neck of the femur and the fracture is joined is described as an example. However, the present invention is not limited to this, and various fractures can be joined. Can be used.
Further, in the case of the above-described embodiment, the case where the set of the joining screw consisting of the lug screw and the sleeve is described as an example, but two or more sets may be used.
The other illustrated configurations are merely examples.
[0021]
【The invention's effect】
As described above in detail, according to the osteosynthesis device according to the present invention, first, the lug screw sleeve constituting the joining screw tool is integrated in advance, and the sleeve is prevented from coming off from the lug screw. Therefore, handling at the time of joining work is easy, and thereby the time required for joining work can be shortened.
In addition, when the sleeve includes a stopper portion, the amount of screwing of the sleeve is regulated by the stopper portion so that the position of the sleeve is automatically determined. It is possible to improve time workability and reduce time.
In addition, when the stopper portion is formed in a tapered shape that increases its diameter toward the anti-male screw side, the tapered portion can effectively function to obtain a locked state. A strong screwed state can be provided.
[Brief description of the drawings]
FIG. 1 is a front view showing a configuration of an osteosynthesis device according to an embodiment of the present invention.
FIG. 2 is a diagram showing an embodiment of the present invention, and is a front view showing a state in which a lug screw of an osteosynthesis device is screwed.
FIG. 3 is a front view of an intramedullary nail showing an embodiment of the present invention.
FIG. 4 is a view showing an embodiment of the present invention and a rear view of an intramedullary nail.
FIG. 5 is a side view of an intramedullary nail showing an embodiment of the present invention.
FIG. 6 is a view showing an embodiment of the present invention and a front view of a joining screw tool.
7 is a diagram showing an embodiment of the present invention, and is a view taken along arrow VII-VII in FIG. 5;
FIG. 8 is a diagram showing an embodiment of the present invention, and is a view taken in the direction of arrows VIII-VIII in FIG. 6;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Femur 1a Neck part of femur 3 Bone joint apparatus 5 Intramedullary nail 7 Large diameter part 9 Small diameter part 21 Through hole 23 Female thread part 37 Joint screw tool 39 Lag screw 41 End member 43 Sleeve 53 Male thread part 55 Stopper part

Claims (1)

骨髄内に挿入・配置されると共に開口縁部が傾斜面になるように斜め方向に指向した状態で形成された貫通孔を備え該貫通孔内に雌ねじ部を形成した骨髄内釘と、
上記骨髄内釘の貫通孔内に挿入され接合対象の骨に螺合されるラグスクリュと、
上記ラグスクリュの外周側に軸方向に移動可能な状態で予め外装され抜け止め処理されていると共に上記貫通孔の雌ねじ部に螺合される雄ねじ部を備えたスリーブと、を具備し、
上記スリーブは雄ねじ部の基端側にストッパ部を備えていて、該ストッパ部が貫通孔の開口縁部に当接することによりそれ以上の螺合が規制されるように構成されていて、
上記ストッパ部は雄ねじ側の端から反雄ねじ側の端に向けてその径を拡大させていくようなテーパ形状になっていることを特徴とする骨接合装置。An intramedullary nail having a through-hole formed in a state of being inserted and arranged in the bone marrow and oriented obliquely so that the opening edge portion is inclined, and an internal thread portion is formed in the through-hole,
A lag screw inserted into the through-hole of the intramedullary nail and screwed into the bone to be joined;
A sleeve provided with a male screw portion that is pre-sealed in an axially movable state on the outer peripheral side of the lug screw and is prevented from being detached and screwed into the female screw portion of the through hole,
The sleeve includes a stopper portion on the proximal end side of the male screw portion, and is configured such that further screwing is restricted by the stopper portion coming into contact with the opening edge portion of the through hole,
The osteosynthesis device according to claim 1, wherein the stopper portion has a tapered shape in which the diameter of the stopper portion increases from the end on the male screw side toward the end on the anti-male screw side .
JP2002296836A 2002-10-10 2002-10-10 Osteosynthesis device Expired - Lifetime JP3979915B2 (en)

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Publication number Priority date Publication date Assignee Title
US20050055024A1 (en) * 2003-09-08 2005-03-10 James Anthony H. Orthopaedic implant and screw assembly
DE102005005657B4 (en) * 2005-02-08 2009-11-26 Königsee Implantate und Instrumente zur Osteosynthese GmbH Femoral Nail
WO2008022136A2 (en) * 2006-08-14 2008-02-21 Smith & Nephew, Inc. Fracture fixation device
JP5335220B2 (en) * 2007-11-08 2013-11-06 株式会社ホリックス Intramedullary nail and method for joining fracture sites using intramedullary nail
EP2133034B1 (en) * 2008-06-13 2011-12-28 Orthofix S.r.l. Intramedullary nail to be inserted into a fractured long bone
RU2015123833A (en) * 2009-11-10 2015-11-27 Смит Энд Нефью, Инк. BONE COMPRESSION ADJUSTMENT
KR101419609B1 (en) 2012-12-18 2014-07-15 고려대학교 산학협력단 Splitted proximal femoral nail device

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