JP2622901B2 - 固定部材 - Google Patents

固定部材

Info

Publication number
JP2622901B2
JP2622901B2 JP6509589A JP50958994A JP2622901B2 JP 2622901 B2 JP2622901 B2 JP 2622901B2 JP 6509589 A JP6509589 A JP 6509589A JP 50958994 A JP50958994 A JP 50958994A JP 2622901 B2 JP2622901 B2 JP 2622901B2
Authority
JP
Japan
Prior art keywords
fixing member
base
screw
rod
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP6509589A
Other languages
English (en)
Other versions
JPH06511415A (ja
Inventor
ハルムス，ユルゲン
シュフレバーガー，ハリー・エル
ビーダーマン，ルッツ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Biedermann Motech GmbH and Co KG
Original Assignee
Biedermann Motech GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE4234118A external-priority patent/DE4234118C2/de
Application filed by Biedermann Motech GmbH and Co KG filed Critical Biedermann Motech GmbH and Co KG
Publication of JPH06511415A publication Critical patent/JPH06511415A/ja
Application granted granted Critical
Publication of JP2622901B2 publication Critical patent/JP2622901B2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
    • 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
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7011—Longitudinal element being non-straight, e.g. curved, angled or branched
    • 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
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Neurology (AREA)
  • Surgery (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)
  • Dowels (AREA)
  • Bipolar Transistors (AREA)
  • Finger-Pressure Massage (AREA)

Description

【発明の詳細な説明】 この発明は、骨に固定されるべきシャフトと、ロッド
に接続するためのヘッドとを備える固定部材に関し、ヘ
ッドの断面は実質的にＵ字形であり、そのベースはシャ
フトに接続され、ヘッドはロッドを受入れるためのチャ
ネルを規定する２つの自由脚を含み、これらの自由脚は
内ねじと外ねじとを備え、この固定部材はさらに、自由
脚の外側を囲み、かつ外ねじと協働する内ねじを有する
部材と、この自由脚の内ねじと協働するねじ山を有する
固定部材とを備える。
そのような固定部材は、文献EP−Ａ−0,487,830から
既知である。ロッドの断面は三角形であり、これはねじ
り運動からの抑制手段としての役割を果たす。意図した
形状矯正に対応して湾曲されたプレートにより、長手方
向の安定化手段が設けられる。本質的に、このプレート
は比較的スペースをとる。さらに、２つの脚の間のベー
スはスリットの長手方向に平坦に形成される。実際的な
応用においては、ロッドに作用する力によって、交番応
力がかなり繰返される。したがって、ロッドは、いくら
か時間がたつとスリットのベースの端部の所で折れやす
い。
この発明の目的は、そのサイズを縮小しかつより大き
い継続的な応力に耐えられるように固定部材を形成する
ことである。そのような固定部材およびそれに接続され
るべきロッドは人の脊柱の矯正インプラントのための構
成部品として用いられるため、このことは特に重要であ
り、したがって寸法を小さくすることおよび負荷の下で
非常に大きな安定性が得られることが望ましい。
上記目的は、以下の構成を備えることによって達成さ
れる。すなわち、固定部材は、骨に固定されるべきシャ
フトと、ロッドに接続されるためのヘッドとを備える。
ヘッドは、シャフトに接続されたベースと、このベース
から延びロッドを受入れるためのチャネルを形成する２
つの自由脚とを有するＵ字状断面形状を備える。脚は、
内ねじと外ねじとを含む。固定部材は、さらに、脚の外
側を囲み、外ねじに螺合する内ねじを有し、上端および
下端が開放されているナットと、脚の内ねじに螺合する
ねじを有する止め部材とを備える。
上記構成を備えた本発明の固定部材によれば、曲がっ
たロッドでも固定部材内に完全に固定できるため、形状
矯正に対応して曲げられた丸いロッドを、形状矯正手段
のためのプレート部材の代わりに用いることができる。
さらに、継続的な負荷の下での安定性は、真っ直ぐなロ
ッドに対してだけではなく、特に湾曲したロッドに対し
てもかなり大きくなる。
好ましい実施例では、ベースは、Ｕ字状チャネルの底
部に位置する領域に、Ｕ字状断面に対して垂直な方向に
見て湾曲した部分を有する。
さらに好ましい実施例では、ベースの縁は、シャフト
に向かって下方かつ外方に傾斜するように形成されてい
る。
さらに好ましい実施例では、ベースは、Ｕ字状チャネ
ルの底部に位置する領域に、脚の内ねじと同心となるよ
うに形成された凹部を有する。
さらに好ましい実施例では、湾曲部分が、中心に向か
って窪んだ部分を含む。望ましくは、湾曲部分が、中心
から離れた位置で、上方に突出した上反り部分を含む。
好ましくは、上反り部分の位置は、内ねじが形成されて
いる円周部分と、外ねじが形成されている円周部分との
間の中央にほぼ一致する。
この発明のさらなる特徴および利点は、図面を参照し
て説明したこの説明の実施例から明らかになるであろ
う。
図において、 図１は、固定部材の第１の実施例の側面図である。
図２は、図１に示す装置の正面図である。
図３は、図１の線III−IIIに沿った断面図である。
図４は、図１に示す装置の分解正面図である。
図５は、第２の実施例の側面図である。
図６は、変形実施例の対称面に沿った拡大断面図であ
る。
図７は、図２の線IV−IVに沿って見た分解断面図であ
る。
図８は、まっすぐなロッドを装着した、図７に対応す
る図である。
図９は、凸状に湾曲したロッドを備える同じ実施例を
示す図である。
図10は、凹状に湾曲したロッドを備える同じ実施例の
図である。
図１に示す固定部材は、ねじ切りされたシャフト２と
ヘッド３とを有する、脊柱に導入されるべきねじ１を含
む。ヘッド３は、ねじ切りされたシャフト２の中心軸に
関して対称であり、かつねじ切りされたシャフト２の方
向に向けられたベース５を有するＵ字形の窪み４を備え
る。Ｕ字形の窪み４を規定するヘッドの側壁は、自由脚
６、７によって形成される。図３および図４において最
良に示されるように、ねじ切りされたシャフト２の中心
軸と同軸でありかつ内ねじ８を有するボアは、チャネル
の内側に設けられる。ヘッド３自体は円筒形であり、図
４において最良に示されるように、自由脚６、７の領域
に外ねじ９を備える。
ロッドをこのねじを用いて固定できるようにするため
に、ねじ切りされたボルトとして形成される固定部材
（止め部材）11が設けられる。固定部材11は、内ねじ８
と協働し、Ｕ字形の窪み４にねじ込むための外ねじを備
える。この固定部材は、ベース５と反対側の面に、ねじ
回しと係合するためのスリットまたは他のいずれかの適
切な窪みを有する。さらに、Ｕ字形の脚６、７の外側を
囲む囲み部材が、スピゴット（ナット）12として形成さ
れ、これは外ねじ９と協働するねじ山を有する。内ねじ
８とそれに関連する固定部材11との回転方向は、外ねじ
９とスピゴット12との回転方向と反対である。図３にお
いて最良に示されるように、Ｕ字形の窪みのベース５の
半径は、その中に受入れられるべきロッド10の半径より
も、ロッドをＵ字形の窪みに容易に挿入しかつそこから
取除くことができるだけのわずかな量だけ大きい。内ね
じ８および外ねじ９はともに、下方向に、すなわちベー
ス５の方向に延在し、その対称軸に関する突起と、ベー
ス５との間隔が、受入れられるべきロッド10の直径より
も小さくされる。
図５に示す実施例では、ヘッドは、ねじ切りされたシ
ャフトにではなく、フック16として形成されるシャフト
に接続される。このシャフトも脊柱の部分に接続するた
めに用いられ、フックは推骨の弓に導入される。
図６に示す実施例では、Ｕ字形の窪みのベースは、内
ねじ８の中心軸と同軸のさら穴17を備える。ベースの２
つのリム18、19は上反りにされ、シャフトに向かって外
側に傾斜している。したがって、湾曲したロッドを受入
れると、Ｕ字形の窪み４のベース上に点状の支持だけで
はなく、より大きい支持領域が形成される。シャフトに
向かったキャンバは、シャフトの方向に湾曲したロッド
と形状が確実により良く適合するようにするために役立
つ。
図７ないし図10において、別の実施例のヘッドが、そ
れに接続されるべきロッドと接続された状態で示されて
いる。ヘッドに接続されるシャフトは、ねじ切りされた
シャフト２として形成されてもよく、またはフック16と
して形成されてもよい。
これらの図に示すように、それぞれのＵ字形の窪みの
ベースは湾曲している。この湾曲した部分は、内部の凹
部20と、ねじの中心軸に関してそれと対称であり、かつ
上方向に突き出た上反りにされた２つの領域21、22とを
備える。ねじの中心軸から離れているビード形の突起21
および22のそれぞれの最頂部の位置は、内ねじ８が形成
されている円周部分と外ねじ９が形成されている円周部
分との間の中央23にほぼ一致する。
図１、図３および図５に最良に示されるように、ヘッ
ド３は、互いに関して180゜でオフセットされ、かつＵ
字形の窪みに関して実質的に90゜でオフセットされ、か
つプライヤ等の工具と係合するための２つの窪み13、14
を備える。
使用時、ねじ１をまず脊柱にねじ込む。その際にロッ
ド10または15、15′をＵ字形の窪み４に配置し、固定部
材11をねじ山８にねじ込むことによって固定する。その
後、スピゴット12を嵌め込む。今、固定部材およびスピ
ゴット12は、これらの２つの部分の各々がロッド10、1
5、15′に所望の保持力を与える程度に、ベース５に向
かって別々に回される。したがって、固定部材11による
ロッドの固定およびスピゴット12によるロッドの固定
は、別々に調整可能であるという利点が得られる。さら
に、クランプすることによってねじの最終的な固定およ
びロッキングが得られる。
Ｕ字形の窪みのベースの湾曲した形状、特に図７ない
し図10に示すような間隔のあけられた突き出た上反りに
された支持領域を上述の位置に有する形状のため、まっ
すぐなロッド10として形成されていても、凸状または凹
状に湾曲したロッド15、15′として形成されていても、
固定されるべき各々のロッドは２つの平坦領域21、22の
上に置かれることになる。図７において最良に示される
ように、固定部材11およびスピゴット12のロッドに面す
る下方の端部24、25はさらに丸くされているか、または
凸状に湾曲されている。したがって、固定されるべきロ
ッドに接触するすべての係合点は、鋭い縁部を用いずに
ロッドに作用する。さらに、上述の配置により、ベース
の２つの突起領域21、22の係合領域を固定部材11の係合
点とスピゴット12の係合点とのちょうど間に配置でき
る。この態様で、特に優れた固定および特に低い応力を
達成できる。図８ないし図10において最良に示されるよ
うに、どのように湾曲したロッド10、15、15′に関して
も優れた固定が得られる。上述の実施例では、ヘッド３
は、ねじ切りされたシャフトまたはフック形のシャフト
にそれぞれしっかりと接続される。変形実施例に従え
ば、それぞれのシャフトおよびヘッドはヒンジを介して
接続される。
───────────────────────────────────────────────────── フロントページの続き (72)発明者 ビーダーマン，ルッツ ドイツ連邦共和国、78048 ファウ・エ ス・フィリンゲン、シェーファーシュタ イク、８ (56)参考文献 特表 平２−500091（ＪＰ，Ａ) 米国特許5129388（ＵＳ，Ａ) 欧州特許出願公開487830（ＥＰ，Ａ) 欧州特許出願公開441729（ＥＰ，Ａ) 欧州特許出願公開346521（ＥＰ，Ａ)

Claims (7)

    (57)【特許請求の範囲】
  1. 【請求項１】骨に固定されるべきシャフト（２、16）
    と、ロッド（10、15）に接続されるためのヘッド（３）
    とを備え、 前記ヘッドは、前記シャフトに接続されたベース（５）
    と、このベースから延び前記ロッドを受入れるためのチ
    ャネル（４）を形成する２つの自由脚（６、７）とを有
    するＵ字状断面形状を備え、 前記脚（６、７）は、内ねじ（８）と外ねじ（９）とを
    含み、さらに 前記脚（６、７）の外側を囲み、前記外ねじ（９）に螺
    合する内ねじを有し、上端および下端が開放されている
    ナット（12）と、 前記脚（６、７）の内ねじ（８）に螺合するねじを有す
    る止め部材（11）とを備える、固定部材。
  2. 【請求項２】前記ベース（５）は、Ｕ字状チャネル
    （４）の底部に位置する領域に、前記Ｕ字状断面に対し
    て垂直な方向に見て湾曲した部分を有する、請求項１に
    記載の固定部材。
  3. 【請求項３】前記ベース（５）の縁（18、19）は、前記
    シャフト（２、16）に向かって下方かつ外方に傾斜する
    ように形成されている、請求項１または２に記載の固定
    部材。
  4. 【請求項４】前記ベース（５）は、Ｕ字状チャネル
    （４）の底部に位置する領域に、前記脚の内ねじ（８）
    と同心となるように形成された凹部（17）を有する、請
    求項１〜３のいずれかに記載の固定部材。
  5. 【請求項５】前記湾曲部分が、中心に向かって窪んだ部
    分を含む、請求項２に記載の固定部材。
  6. 【請求項６】前記湾曲部分が、中心から離れた位置で、
    上方に突出した上反り部分（21、22）を含む、請求項５
    に記載の固定部材。
  7. 【請求項７】前記上反り部分（21、22）の位置は、前記
    内ねじ（８）が形成されている円周部分と、前記外ねじ
    （９）が形成されている円周部分との間の中央にほぼ一
    致する、請求項６に記載の固定部材。
JP6509589A 1992-10-09 1993-10-08 固定部材 Expired - Lifetime JP2622901B2 (ja)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4234118.3 1992-10-09
DE4234118A DE4234118C2 (de) 1992-10-09 1992-10-09 Verankerungselement
PCT/EP1993/002756 WO1994008527A1 (de) 1992-10-09 1993-10-08 Verankerungselement

Publications (2)

Publication Number Publication Date
JPH06511415A JPH06511415A (ja) 1994-12-22
JP2622901B2 true JP2622901B2 (ja) 1997-06-25

Family

ID=6470108

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6509589A Expired - Lifetime JP2622901B2 (ja) 1992-10-09 1993-10-08 固定部材

Country Status (9)

Country Link
US (2) US5545165A (ja)
EP (2) EP0616512B1 (ja)
JP (1) JP2622901B2 (ja)
KR (1) KR0148838B1 (ja)
AT (1) ATE157233T1 (ja)
CA (1) CA2124840C (ja)
DE (2) DE4245026B4 (ja)
ES (1) ES2108881T3 (ja)
WO (1) WO1994008527A1 (ja)

Families Citing this family (326)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5545165A (en) * 1992-10-09 1996-08-13 Biedermann Motech Gmbh Anchoring member
US6077262A (en) * 1993-06-04 2000-06-20 Synthes (U.S.A.) Posterior spinal implant
US5961517A (en) * 1994-07-18 1999-10-05 Biedermann; Lutz Anchoring member and adjustment tool therefor
DE4425357C2 (de) * 1994-07-18 1996-07-04 Harms Juergen Verankerungselement
JP3925942B2 (ja) 1996-02-16 2007-06-06 スミス アンド ネフュー インコーポレーテッド 移植片固定具
DE19617362C2 (de) * 1996-04-30 1999-06-10 Harms Juergen Verankerungselement
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US5725527A (en) 1998-03-10
ES2108881T3 (es) 1998-01-01
CA2124840C (en) 1998-08-25
DE4245026B4 (de) 2007-03-08
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CA2124840A1 (en) 1994-04-28
ATE157233T1 (de) 1997-09-15
US5545165A (en) 1996-08-13
EP0616512A1 (de) 1994-09-28
EP0616512B1 (de) 1997-08-27
KR0148838B1 (ko) 1998-10-01
EP0776635A1 (de) 1997-06-04

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