JP3792287B2 - アンカー部材 - Google Patents
アンカー部材 Download PDFInfo
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- JP3792287B2 JP3792287B2 JP05450196A JP5450196A JP3792287B2 JP 3792287 B2 JP3792287 B2 JP 3792287B2 JP 05450196 A JP05450196 A JP 05450196A JP 5450196 A JP5450196 A JP 5450196A JP 3792287 B2 JP3792287 B2 JP 3792287B2
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- 238000002788 crimping Methods 0.000 claims 1
- 230000004323 axial length Effects 0.000 description 3
- 238000007373 indentation Methods 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
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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
- A61B17/70—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
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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
-
- 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
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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
- A61B17/70—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
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- Medical Informatics (AREA)
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- Veterinary Medicine (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Surgical Instruments (AREA)
- Prostheses (AREA)
- Dowels (AREA)
- Sheet Holders (AREA)
- Bipolar Transistors (AREA)
- Finger-Pressure Massage (AREA)
Description
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の方に向けられた底部と第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16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27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の底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45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25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10°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
Claims (12)
- 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(15)とを受入れるためのシート部分(5)と、前記ねじ部材(1)のヘッド(3)の側面を包み込む圧力部材(20)とを有し、
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形状の窪みを有する第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、前記圧力部材(20)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)で前記第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の領域(16)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。 - 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。
- 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。
- 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(22)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。
- 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。
- 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。
- 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)の底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。
- 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(28)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。
- 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。
- 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。
- 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。
- 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。
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 |
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JPH08257035A JPH08257035A (ja) | 1996-10-08 |
JP3792287B2 true JP3792287B2 (ja) | 2006-07-05 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP05450196A Expired - Lifetime JP3792287B2 (ja) | 1995-03-15 | 1996-03-12 | アンカー部材 |
Country Status (8)
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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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1995
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- 1996-02-22 DE DE59605091T patent/DE59605091D1/de not_active Expired - Lifetime
- 1996-02-29 TW TW085102384A patent/TW312737B/zh not_active IP Right Cessation
- 1996-03-05 US US08/611,991 patent/US5672176A/en not_active Expired - Lifetime
- 1996-03-05 CA CA002171068A patent/CA2171068C/en not_active Expired - Lifetime
- 1996-03-12 JP JP05450196A patent/JP3792287B2/ja not_active Expired - Lifetime
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DE59605091D1 (de) | 2000-06-08 |
DE19509332C1 (de) | 1996-08-14 |
KR100399660B1 (ko) | 2004-03-10 |
TW312737B (ja) | 1997-08-11 |
JPH08257035A (ja) | 1996-10-08 |
EP0732081A1 (de) | 1996-09-18 |
CA2171068C (en) | 1999-02-09 |
EP0732081B1 (de) | 2000-05-03 |
CA2171068A1 (en) | 1996-09-16 |
US5672176A (en) | 1997-09-30 |
ATE192308T1 (de) | 2000-05-15 |
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