JPH08257035A - アンカー部材 - Google Patents

アンカー部材

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Publication number
JPH08257035A
JPH08257035A JP8054501A JP5450196A JPH08257035A JP H08257035 A JPH08257035 A JP H08257035A JP 8054501 A JP8054501 A JP 8054501A JP 5450196 A JP5450196 A JP 5450196A JP H08257035 A JPH08257035 A JP H08257035A
Authority
JP
Japan
Prior art keywords
head
screw
recess
anchor member
pressure member
Prior art date
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Granted
Application number
JP8054501A
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English (en)
Other versions
JP3792287B2 (ja
Inventor
Juergen Harms
ユルゲン・ハルムス
Lutz Biedermann
ルッツ・ビーダーマン
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Classifications

    • 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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7035—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
    • A61B17/7037—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other wherein pivoting is blocked when the rod is clamped
    • 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
    • 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
    • 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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Neurology (AREA)
  • Molecular Biology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Animal Behavior & Ethology (AREA)
  • Engineering & Computer Science (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)
  • Prostheses (AREA)
  • Bipolar Transistors (AREA)
  • Finger-Pressure Massage (AREA)
  • Sheet Holders (AREA)
  • Dowels (AREA)

Abstract

(57)【要約】 【課題】 シート部分のロッドに対する位置を調整する
際にねじ部材のヘッドとシート部分との間にロックを保
持するアンカー部材を提供する。 【解決手段】 このアンカー部材は、ねじが切られた部
分（２）とヘッド（３）を有するねじ部材（１）と、ヘ
ッド（３）とアンカー部材に接続されるべきロッド（１
５）とを受入れるためのシート部分（５）とを含む骨ね
じを有する。

Description

【発明の詳細な説明】
【０００１】この発明は請求項１のプリアンブルに記載
のアンカー部材に関する。多軸骨ねじとして形成された
アンカー部材はドイツ特許４３ ０７ ５７６に開示さ
れている。この装置を使って、ねじ部材のシート部分に
対する位置は、ねじ部材のヘッドに作用し、挿入された
補正ロッドおよびロッドロッキングねじによってねじ部
材のねじに対して付勢される圧力ディスクによって固定
される。これにより、ロッドおよびアンカー部材の相対
的な位置決めのためにロッドロッキングねじを緩めた場
合に、シート部分に対するねじ部材のヘッドのロックも
同時に解除されてしまうという問題が生じる。したがっ
て、脊椎を接続するロッド上のシート部分の位置を調整
し直すたびに、シート部分もねじ部材のヘッドに対して
動いてしまい、これは不都合である。
【０００２】この発明の目的は、シート部材のロッドに
対する位置を調整するときにねじ部材のヘッドとシート
部分との間にロックを保持するアンカー部材を提供する
ことである。
【０００３】この目的は請求項１に規定されたアンカー
部材によって達成される。この発明の他の実施例は従属
クレームに規定されている。
【０００４】この発明の他の特徴および利点は、図面を
参照する以下の実施例の説明から明らかになるであろ
う。
【０００５】
【実施例の説明】図２および３に最もよく示されている
ように、アンカー部材はねじが切られたシャフト２とヘ
ッド３とを有する適切なねじ部材１を含む。ヘッド３
は、ねじが切られたシャフト２に隣接する領域の球状の
部分として形成される。ヘッド３の軸方向の長さはヘッ
ドの半径より大きい。ヘッド３は、ねじが切られたシャ
フト２と反対側に窪み４を有し、その窪みの面で六角形
のソケットねじキーと係合する。
【０００６】このアンカー部材はさらにねじ部材１のヘ
ッド３を受入れるためのシート部分５を含む。シート部
分５は第１の端部６および反対の第２の端部７ならびに
第１および第２の端部を通る対称軸８を含む。ボア９は
対称軸と同軸であり、ねじが切られたシャフトを第１の
端部からの方向に通す。第１の端部６に隣接する第１の
領域では、シート部分５は対称軸８について対称なＵ形
状の窪み１０を有し、この窪み１０は第２の端部７の方
に向けられた基部と第１の端部の方に延びる２つの自由
側脚１１、１２とを有する。脚１１、１２の領域では、
ボアは円筒状であり、シート部分は内部ねじ山１３と外
部ねじ山１４とを有する。Ｕ形状の窪み１０によって形
成された溝は、複数のこのようなアンカー部材を接続す
るロッド１５を嵌合するのに十分なだけのサイズを有す
る。第２の端部７に隣接する第２の領域では、ボア９の
円筒状の部分に続いて、約４°のテーパ角度で第２の端
部７に向かって先細になる部分１６がある。この部分１
６の軸長はヘッド３の軸寸法に実質的に対応する。
【０００７】第２の端部では、ボア９の直径は、ねじが
切られたシャフトの直径よりかなり大きく、それによ
り、ねじが切られたシャフトは、挿入された状態で、テ
ーパ角度内で対称軸８を中心として回転可能である。
【０００８】ねじ部材のヘッド３に作用し、かつヘッド
３から離れた第１の面２１と反対の第２の面２２とを有
する圧力部材２０が、ヘッド３の位置をシート部分５内
に決めるために設けられる。第１の面２１に隣接して、
圧力部材は、シート部分５のボア９内での圧力部材の軸
摺動を可能にするように選択された外径を有する実質的
に円筒状の第１の部分２３を有する。圧力部材２０は、
さらに第１の部分２３および第２の面２２に隣接する第
２の部分２４を含む。第２の部分２４は、シート部分５
内のボア９の部分１６のテーパ角度に対応するテーパ角
度で第２の面２２に向かって円錐形に先細になる外表面
を有する。ヘッド３を受入れるための球部分形状の窪み
２５が第２の面２２に同軸上に形成され、第２の面２２
に向かって開く。球部分形状の窪み２５はヘッド３の半
径に実質的に対応する半径を有する。窪み２５の軸方向
に延びる長さはその半径より大きい。圧力部材２０の壁
は、周辺から等距離の態様で配置され、軸に平行な４つ
のスリットを有し、これらのスリットは第２の面２２に
向かって開き、窪み２５の半径より大きい軸長を有す
る。
【０００９】圧力部材２０はさらに、その円筒状の第１
の部分２３において、窪み４と係合するねじ締め工具の
ための通路を与えるボア２６を含む。ボア２６は円筒軸
と同軸であり、窪み２５につながる。円筒部分の形状を
有し、第１の部分２３の円筒軸と垂直に延在する窪み２
７が圧力部材の表面の第１の面２１のところに形成され
る。その曲率中心は対称軸上にある。この窪みの深さは
窪みの半径ほど大きくはない。窪み２７の曲率半径はシ
ート部分５のＵ形状の窪み１０の基部の曲率半径に対応
する。縦スリット２８は、ヘッド３を包み込む圧力部材
の円錐部分２４を上に曲げ、圧力部材２０の球部分形状
の窪み２５がねじのヘッド３に押しつけられるようにす
る目的に役立つ。
【００１０】対称軸に垂直に延びるさら穴２９が圧力部
材２０のジャケット上でお互いに対向して設けられる。
対応のクリンプボア１７がシート部分５のジャケットに
形成される。
【００１１】さらに、２つの側脚１１、１２の外側を包
む部材が設けられる。この部材は、受入れるべきロッド
１５を位置決めするためのスイベルナットとして形成さ
れ、シート部分５の２つの脚の所で外部ねじ山１４に対
応する内部ねじ山を有する。さらに、ロッキング部材４
５がねじが切られたねじ部材として形成される。ロッキ
ング部材４５は脚１１、１２の内部ねじ山と協働して、
ロッキング部材をシート部分５のＵ形状の窪み１０にね
じ込むための外部ねじ山４６を有する。ロッキング部材
４５はさらにねじ締め工具と係合するための六角形の窪
み４７を有する。
【００１２】記載されたアンカー部材のすべての構成要
素は物理的によく知られた材料、特にチタンから製造さ
れる。
【００１３】まず、圧力部材２０がヘッド３に押しつけ
られ、ヘッドが球部分形状の窪み２５のエッジによって
包み込まれるようにする。押しつける際に発生する力は
縦スリット２８のところで圧力部材を僅かに分離するよ
うに曲げる作用をし、ねじのヘッド３が球部分形状の窪
み２５に挿入できるようにし、圧力部材はヘッド３にカ
チッと締まる。その後、圧力部材を僅かに圧縮すること
によって、球部分形状の窪み２５のエッジとねじのヘッ
ド３との間の確実な接続が得られる。
【００１４】次にねじが切られたシャフト２が第１の端
部６からシート部分に挿入され、圧力部材２０の第２の
部分２４の円錐形の外表面がボア９の円錐形の部分１６
の壁と摩擦を生じて係合するようになる。この間、圧力
部材２０は、部分的に円筒状の窪み２７の軸がシート部
分５のＵ形状の溝１０のちょうど対称面になるように回
される。この位置は、圧力部材２０がシート部分の対称
軸８の方向に十分移動するのを妨げることなく、クリン
プボア１７、２９による僅かな圧着によってロックされ
る。
【００１５】動作において、ねじ部材はねじ込まれ、ロ
ッド１５は外側からＵ形状の窪み１０に挿入されること
によってシート部分５に据えられる。アンカー部材をロ
ッド１５に対して所望の位置に調整した後、ロッドはス
イベルナット４０をしっかり締めることによって固く固
定される。図１に特に示されるように、スイベルナット
４０をしっかり締めることにより、力Ｆが対称軸８の方
向にロッド１５を介して圧力部材２０にかかり、圧力部
材２０がねじのヘッド３とともにシート部分に押し込ま
れ、圧力部材２０の円錐形の第２の部分２４をシート部
分のボア９の円錐形の部分１６に完全に押し込むように
する。
【００１６】圧力部材の第２の部分２４の円錐形の表面
すべてがシート部分のボア９の表面に密着すると、シー
ト部分は、特に図１に示されるように、対称軸８に関し
て半径方向に力Ｆres を圧力部材にかける。この力は、
たとえスイベルナット４０がロッド１５のシート部分５
に対する位置を再調整するために緩められても、窪み２
５内のねじのヘッドの動きを妨げる。したがって、ねじ
部材１のシート部分５に対する角度位置は先にロッドが
ロックされたときに固定されたままである。
【００１７】ボアの部分１６の円錐形の表面と圧力部材
の部分２４との間に形成された接続の自己ロッキングを
生じるようにテーパ角度が選択されるので、この接続は
それ自体で緩むことはない。むしろ、緩むのを妨げるよ
うに作用する摩擦力に打ち勝つにはかなりの程度の付加
的な外力が必要である。
【００１８】動作において、対応のアンカー部材が脊柱
の複数の隣接セグメントの各々に配置され、それによっ
て、ロッドの長さ方向の軸に対して、ロッドにおける個
々のアンカー部材の係合位置を調整するためにセグメン
トごとに正確な調整が行なわれる。シート部分のロッド
に対する位置を正確に調整するために、スイベルナット
４０を再び緩めることが可能である。なぜなら、シート
部分のロッドに対する位置を主に調整するためにシート
部分内のねじのヘッドの位置を調整する場合には、圧力
部材はシート部分５にしっかりと押し込まれ、それによ
ってねじのヘッド３の位置をロックし、このロックはそ
の自己ロッキング作用のために通常動作では解除できな
いからである。
【００１９】正確な調整によって得られるシート部分５
のロッド１５に対する位置が確定した後、スイベルナッ
トは再びしっかりと締められる。それに従って、ロッキ
ング部材４５はロッドに向かう方向に脚１１、１２間に
締め込まれ、スイベルナットをロックする。
【００２０】好ましくは、上述のテーパ角度は２°と１
０°との間の範囲である。この角度については２°と５
°との間の範囲が特に好ましい。
【図面の簡単な説明】
【図１】部分的に断面で示した、アンカー部材とその中
に置かれるロッドの断面図である。
【図２】詳細に分解図の形で示したアンカー部材の図で
ある。
【図３】挿入されたねじ部材および圧力部材とともにア
ンカー部材を示す一部断面図である。
【符号の説明】
１ ねじ部材 ２ ねじが切られたシャフト ３ ヘッド ４ 窪み ５ シート部分 ８ 対称軸 １０ Ｕ形状の窪み
───────────────────────────────────────────────────── フロントページの続き (72)発明者 ユルゲン・ハルムス ドイツ連邦共和国、76337 バルドブロン、 フォーゲセンシュトラーセ、60 (72)発明者 ルッツ・ビーダーマン ドイツ連邦共和国、78048 ファウ・エス −フィリンゲン、アム・シェーファーシュ タイク、８

Claims (12)

    【特許請求の範囲】
  1. 【請求項１】 アンカー部材であって、ねじが切られた
    部分（２）と球部分形状の部分を有するヘッド（３）と
    を有するねじ部材（１）と、前記ねじ部材の前記ヘッド
    （３）と前記アンカー部材に接続されるべきロッド（１
    ５）とを受入れるためのシート部分（５）とを含む骨ね
    じを有し、前記シート部分（５）は第１およびその反対
    側の第２の端部（６、７）と、前記第１および第２の端
    部を通る対称軸（８）と、前記ねじが切られた部分
    （２）を通すための前記対称軸と同軸に配置されたボア
    （９）と、前記第１の端部（６）に隣接し、その中に挿
    入されるべきロッド（１５）を受入れるための内部ねじ
    山（１３）を有する２つの自由脚（１１、１２）ととも
    に実質的にＵ形状の断面を有する第１の領域とを有し、 前記ボア（９）は前記第２の端部に隣接し、前記第２の
    端部（７）に向けて先細になる第２の領域（１６）にお
    いてテーパ角度を有し、圧力部材（２０）はねじが切ら
    れた部分（２）と反対側のねじのヘッド（３）の側面を
    包み込み、前記圧力部材の外表面は前記ねじのヘッド
    （３）を横方向に取囲む部分（２４）で第２の端部
    （７）に向かって円錐形に先細になるように形成され、
    前記圧力部材の前記テーパ角度は前記第２の部分（１
    ６）のテーパ角度に対応することを特徴とする、アンカ
    ー部材。
  2. 【請求項２】 前記テーパ角度は約２°から約１０°の
    範囲内であることを特徴とする、請求項１に記載のアン
    カー部材。
  3. 【請求項３】 前記テーパ角度は約４°であることを特
    徴とする、請求項１または２に記載のアンカー部材。
  4. 【請求項４】 前記圧力部材は第１およびその反対側の
    第２の面（２１、２２）ならびに前記第１の面（２１）
    に隣接する実質上円筒状の第１の部分（２３）を有し、
    前記第１の部分は前記ボア（９）内の前記圧力部材の摺
    動を可能にするように選択された外径を有し、前記圧力
    部材は前記第１の部分（２３）に隣接する第２の部分
    （２４）を有し、前記第２の部分は前記第２の面（２
    ２）に向かって円錐形に先細になる外表面を有する先端
    を切られた円錐として形成されることを特徴とする、請
    求項１から３のいずれかに記載のアンカー部材。
  5. 【請求項５】 前記圧力部材（２０）は前記圧力部材の
    前記第２の部分（２４）に前記ねじのヘッド（３）を受
    入れるための窪み（２５）を有し、前記窪みは球状の部
    分として形作られ、前記第２の面に向かって開くことを
    特徴とする、請求項４に記載のアンカー部材。
  6. 【請求項６】 前記圧力部材（２０）は前記ねじのヘッ
    ド（３）と係合するようにねじ締め工具を通すためのボ
    アを有し、前記ボアは前記第１の部分（２３）の円筒軸
    と同軸であり、前記球部分形状の窪み（２５）とつなが
    ることを特徴とする、請求項５に記載のアンカー部材。
  7. 【請求項７】 前記圧力部材（２０）は前記ねじのヘッ
    ド（３）から離れた側に窪み（２７）を有し、前記窪み
    は、前記対称軸（８）に垂直な円筒軸と、前記シート部
    分の前記２つの脚（１１、１２）によって規定された前
    記Ｕ形状の窪み（１０）の基部の曲率半径に対応する曲
    率半径とを有する円筒部分として形成されることを特徴
    とする、請求項１から６のいずれかに記載のアンカー部
    材。
  8. 【請求項８】 前記圧力部材（２０）は、前記第２の面
    （２２）に向かって開き、前記第１の部分（２３）の前
    記円筒軸に平行な縦軸を有する複数の縦スリット（２
    ８）を有することを特徴とする、請求項５から７のいず
    れかに記載のアンカー部材。
  9. 【請求項９】 ２つの対向する縦スリット（２８）があ
    り、その縦軸は、前記第１の円筒部分（２３）の前記円
    筒軸を通りかつ前記窪み（２７）の前記円筒軸に垂直に
    延在する面にあり、前記縦スリットは前記圧力部材の前
    記第１の面（２１）に近接して延びることを特徴とす
    る、請求項８に記載のアンカー部材。
  10. 【請求項１０】 前記ねじのヘッド（３）が中に置かれ
    た前記圧力部材（２０）は圧着によって前記シート部分
    （５）内で回転しないようにされることを特徴とする、
    請求項１から９のいずれかに記載のアンカー部材。
  11. 【請求項１１】 前記窪み（２５）の軸方向の深さは前
    記窪みの半径より大きいことを特徴とする、請求項５か
    ら１０のいずれかに記載のアンカー部材。
  12. 【請求項１２】 スイベルナット（４０）として形成さ
    れ、前記２つの自由脚（１１、１２）の外側を包み込む
    部材が設けられ、前記部材の内部ねじ山は前記脚の領域
    の外部ねじ山（１４）と協働し、前記スイベルナット
    （４０）をロックするためのロッキング部材（４５）が
    設けられ、前記ロッキング部材は前記脚（１１、１２）
    の前記内部ねじ山（１３）と係合する外部ねじ山を有す
    ることを特徴とする、請求項１から１１のいずれかに記
    載のアンカー部材。
JP05450196A 1995-03-15 1996-03-12 アンカー部材 Expired - Lifetime JP3792287B2 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19509332:1 1995-03-15
DE19509332A DE19509332C1 (de) 1995-03-15 1995-03-15 Verankerungselement

Publications (2)

Publication Number Publication Date
JPH08257035A true JPH08257035A (ja) 1996-10-08
JP3792287B2 JP3792287B2 (ja) 2006-07-05

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US (1) US5672176A (ja)
EP (1) EP0732081B1 (ja)
JP (1) JP3792287B2 (ja)
KR (1) KR100399660B1 (ja)
AT (1) ATE192308T1 (ja)
CA (1) CA2171068C (ja)
DE (2) DE19509332C1 (ja)
TW (1) TW312737B (ja)

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TW312737B (ja) 1997-08-11
DE19509332C1 (de) 1996-08-14
US5672176A (en) 1997-09-30
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ATE192308T1 (de) 2000-05-15
CA2171068A1 (en) 1996-09-16
CA2171068C (en) 1999-02-09
DE59605091D1 (de) 2000-06-08
KR100399660B1 (ko) 2004-03-10
KR960033409A (ko) 1996-10-22
JP3792287B2 (ja) 2006-07-05

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