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JPH04506759A - ペディケルねじのための受容部分とペディケルねじ - Google Patents

ペディケルねじのための受容部分とペディケルねじ

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Publication number
JPH04506759A
JPH04506759A JP2510850A JP51085090A JPH04506759A JP H04506759 A JPH04506759 A JP H04506759A JP 2510850 A JP2510850 A JP 2510850A JP 51085090 A JP51085090 A JP 51085090A JP H04506759 A JPH04506759 A JP H04506759A
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screw
spherical segment
bore
segment
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ビーダーマン,ルッツ
ハルムス,ユルゲン
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
    • A61B17/7001Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7035Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
    • A61B17/7037Screws 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
    • A61B17/7001Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002Longitudinal elements, e.g. rods
    • A61B17/7004Longitudinal elements, e.g. rods with a cross-section which varies along its length
    • A61B17/7008Longitudinal elements, e.g. rods with a cross-section which varies along its length with parts of, or attached to, the longitudinal elements, bearing against an outside of the screw or hook heads, e.g. nuts on threaded rods
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
    • A61B17/7001Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7032Screws or hooks with U-shaped head or back through which longitudinal rods pass
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
    • A61B17/7001Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002Longitudinal elements, e.g. rods
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86Pins or screws or threaded wires; nuts therefor

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Neurology (AREA)
  • Surgery (AREA)
  • Molecular Biology (AREA)
  • Veterinary Medicine (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Engineering & Computer Science (AREA)
  • Surgical Instruments (AREA)
  • Prostheses (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Dowels (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
  • Moving Of Heads (AREA)
  • Mechanical Control Devices (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。

Description

【発明の詳細な説明】 ペディケルねじのための受容部分とベディケルねしこの発明は、ねし軸部と球状 ないしは球状セグメントを有する頭部とを備えたねじを継ぎ手を用いてロッドに 接続するペディケル(Pedikel :pedicle)ねじのための受容部 分、ならびにを柱セグメントを安定させるためのベディケルねじとに関するもの である。
DE−AS 26 49 042から、ねじ部分と、その頭部側端部に固定され て設けられる受容部分とを存するペディケルねじが知られている。そのような数 対のねじは各々両側のねじから互いに距離を置き、を柱から推体内へねじ込めら れる。各受容部分は受容スリットを備える。右側ないしは左側のねしグループの これらの受容スリットを介して、各々1本のねじロッドが導かれる。次にこのロ ッドは、固定ねじの助けによって各々の受容部分に固定される。この方法の短所 の1つは、ねじを椎体内にねじ込んで固定する一方で、ねじロッドがねじの応力 を受けることなく受容スリット内を貫通することができるように、互いに重なり 合う受容部分の受容スリットの軸が整列するようねじを2つの平面において正確 に配置するのが難しいということである。また、これを行なうには大変時間がか かり、これはを柱の手術においては大きな欠点となる。さらに、そのように正確 な算定はほとんど不可能である。すなわち、相当なせん断応力がねじロッドにか かり、その結果、術後の使用において、ロッドが破損することもあり得る。
EP 0 242 708 Aから、ねじ軸部と球状ないしは球状セグメントを 有する頭部とを備えた本来のねじと、継ぎ手を介してそれと接続可能な受容部分 とからなるペディケルねじか知られている。この受容部分は1つのリングによっ て結合される2つの頭部半休を有し、これらの半体は互いに向き合う中空球状の セグメントを内側に有し、それらが合わさった状態て取り囲む頭部は、そのよう にして形成された球状の中空の中央において旋回可能である。
このようにして、それ自体極めて良好に機能するペディケルねじが提供される。
しかしながら、手術の際にはさまざまな長さの、あるいは場合によってはさまざ まな直径のねじか必要となる。従来のねじでは、所望されるあらゆる大きさのね じを常備しておくことが必要である。球状のセグメントを有する2つの曲面半休 およびこれを結合するリングは高い精度を必要とするため、そのようにすべての ねじを揃えるには保管経費が大変高くなる。
この発明の課題は、そのようなねじを在庫管理するためのコストを下げる可能性 を見い出すことである。
この課題は、請求の範囲第1項による受容部分によって解決する。
そのような受容部分を有するペディケルねじの特許請求の範囲第2項に記載され ている。
この発明のその他の特許請求の範囲第3項ないし8項に記載されている。
この発明によって、在庫管理の際には、長さおよび太さは異なるか同じ頭部を有 するねじ軸のみを備えればよい。
これによって在庫管理のコストか大幅に削減される。
この発明のさらなる特徴および実用性は、図面に基づ〈実施例の説明から明らか である。
第1図は、受容部分を有するペディケルねじの分解側面図であり、部分的に断面 図が示される。
第2図は、受容部分と、挿入されたねじと、受容部分と接続されたロッドとの拡 大断面図である。
第3図は、第1図に対して対称軸の周りを90度面回転せた拡大図である。
ペディケルねじIは、ねじ軸部3と、それと一体的に形成された球状セグメント を有する頭部4とを存する本来のねじ2ならびに受容部分5を有する。
受容部分5はねじ2を受容するためのハウジング6を有する。ハウジングはその 内部に受容空間7を有する。この空間はこの受容空間の軸方向における一方端に ボア8を有し、その直径は頭部4の球状セグメントの半径の2倍より小さい。そ の内部においてボアに繋がるのは中空球状セグメント部分9であり、その半径は 頭部4の球状セグメントの半径にほぼ等しい。中空球状セグメント9は、ボア8 に相対する開口lOに向けて延びる中空円筒状セグメント11に繋かり、その直 径は、ねじ2を受容部分に挿入した際頭部が第2図に示された位置に達し得るよ うに、すなわち、頭部か中空球状セグメント9にぴったりと嵌合するように、頭 部4の球状セグメントの半径の2倍よりわずかに大きい。
特に第2図に明らかなように、ボア8は円筒状セグメントの軸と同軸であるよう に調整され、内側から外側を見た場合、外側に向けて放射状に拡大する内壁を有 する円錐形状を有する。これによって、この円錐部分の直径によって決まる角度 領域内において、挿入されたねじが中空円筒状セグメントの軸の周りを旋回する ことが可能どなる。
中空球状セグメント9からは距離をおいて、このハウジングは2つの、互いに対 して180度偏泣きれ、かつ中空円筒状セグメンt−i tの軸に平行に延び、 開口lOに向けて開かれた受容スリット12および13を存する。各受容スリッ ト・は、前述の EP 0 242 708 Aに記載されたベディケルねじに おけるように、外側に各々1つのシンク24,15を有する。受容スリットの幅 は、受容されるへきねじロッド16がこれを介して自由に貫通できるように、定 められる。第1図において最も明らかなように、このハウジングはさらにハウジ ングの対称軸の周りを受容スリット12および13に対して90度偏位されたス リット17を有し、これらのスリットは開口10から受容空vi7のほぼ内側端 縁にまで延びる。
さらに、円筒状の入れ子の形をした圧力エレメント18か設けられる。この円筒 の外径は円筒状セグメント11の内径にほぼ等しく、かつ圧力エレメントが中空 円筒内を偏位可能な程度に小さなものに定められる。第1図において最も明らか なように、この圧力エレメントは中空の円筒として形成されるのが望ましい。ハ ウジング6内に挿入された際に中空球状セグメントの側になる端部は、同様に中 空球状セグメント19を有する。この曲面の半径は、中空球状セグメントの半径 と球状セグメント4との半径にほぼ等しくなるよう定められる。
圧力エレメント18はさらに、受容スリット12およびI3に対応する2つの受 容スリット20および21を有し、それらは中空球状セグメント19とは距離を おいて圧力エレメントの対称軸と平行に、圧力エレメントの反対側の開口22ま で延び、ねじロッド16を受容する。さらに、受容スリットに対して対称軸の周 りをほぼ90度偏位させた2つの相対するスリット23が同様に設けられ、それ らは中空球状セグメント19のすぐ上方に繋がり、その反対側において開かれて いる。
さらに、ナツト24および25が設けられ、これらは第2図に示されたようにロ ッド16をペディケルねじと接続する働らきをする。
ねじ軸部分3とは反対側において頭部4を球状に形成することは基本的には可能 である。その場合、ハウジング6内の受容スリットおよびシンクは、ねじが旋回 する際にその頭部がロッドないしはそれを保持するねじと接触することがないよ うにロッド16が十分な距離をもって頭部上に位置するよう、選はれる。頭部は 、そのねじ軸部分3とは反対側の端部に、ねじの軸に対して垂直に延びる平らな 表面26を有するのか望ましい。この平面には窪みが入れられ、ねじを回転させ るため、ドライバ等の工具をこの窪みに1系合すu“ることか可能である。
ベディケルねじを使用する簡に、所望の直径と長さを有するねじ2が第2図に示 された位置に、頭部の球状部分か中空球状セグメンI・内に載置されるように、 挿入される。
次に、ねじか各々の椎体内にねじ込まれ、頭部に設けられた窪みに適切な工具が 係合される。ねじ止めの後(場合によっては予め)圧力ニI/メントが、第2図 から最も明らかなように、その中空球状セグメント19か頭部4の球面領域上に 載置されるよ・うに、中空円筒状セグメントll内に挿入される。ハウジング6 と圧力エレメント18との受容スリットは互いに並列となるよう調整される。次 に、それらと接続されるべきロッド16が受容スリット内にはめ込まれナツト2 4および25によってそれらにしっかりと固定される。受容スリット20および 21の底部は、ロッドを保持するナツトをねじ止めする際に中空球状セグメント の方向に向けてさらなるせん断応力か頭部4にかかるように、スリブ1−の自由 端の方へ偏位されている。ハウジング6の円筒状壁面はスリット17および23 の存在によって、より強いクランプ力か頭部にかかる程度に、わずかにたわみ得 る。圧力エレメント18が設けられることによって、ねじを固定するためにこの ようにねじ頭部に圧力をかける際に、頭部は中空球状セグメント・19との密接 な接続などによって内部に押し込まれるのではなく、完全に中空球状の領域に囲 まれ、圧力エレメントによって中空球状セグメント19の方向においてさえも圧 力を加えられる。これによって、調整された角度位置における堅固なロックが可 能となる。
国際調査報告 国際調査報告

Claims (8)

    【特許請求の範囲】
  1. 1.ねじ軸部(3)と球状ないしは球状セグメントを有する頭部(4)とを備え たねじ(2)をロッド(16)に継ぎ手を用いて接続するペディケルねじのため の受容部分であって、 一方端にねじ軸部(3)を貫通させるためのボア(8)を、これに隣接する内側 に、受容すべきねじ(2)の頭部(4)を載置するための中空球状セグメント( 9)を、さらにボアと反対側には、ねじ(2)を挿入するための開口(10)を 有する内側の受容空間(7)と、嵌め込まれた状態で、ねじ頭部が中空球状セグ メント(9)に押しつけられるような力を、その頭部に与える圧力エレメント( 18)とを備えた、ペディケルねじのための受容部分。
  2. 2.脊柱セグメントを固定するためのべディケルねじ(1)であって、 ねじ軸部(3)およびそれと継ぎ手によって接続される頭部側の、ロッド(16 )のための受容部分(5)と、ねじ軸部の端部にある球状ないしは球状セグメン トを有する頭部(4)と、 一方端にはねじ軸部(3)を貫通させるためのボア(8)を、これに隣接して内 側には、頭部(4)を載置するための中空球状セグメント(9)を、ボアと反対 側には、頭部(4)と共にねじ軸部(3)を挿入するための開口(10)を有す る、受容部分(5)内の受容空間(7)と、さらに 嵌め込まれた状態で、ねじ頭部が中空球状セグメント(9)に押しつけられるよ うな圧力を、その頭部に与える圧力エレメント(18)とを備えた、ペディケル ねじ。
  3. 3.受容部分(5)が、ボア(8)とは反対側の部分において開かれた端縁まで 延びる少なくとも1つのスリット(17)と、これに対して角度が偏位された、 ロッド(16)を貫通させかつそれをナット(24,25)によってロックさせ るための、互いに向き合うスリット(12,13)とを備えることを特徴とする 、請求の範囲第1項または第2項に記載のエレメント。
  4. 4.圧力エレメント(18)が、頭部(4)側のその端部に頭部に向けられた中 空球状セグメント(19)を備えることを特徴とする、請求の範囲第1項または 第3項に記載の、エレメント。
  5. 5.中空球状セグメント(9,19)と球ないしは球状セグメント(4)の半径 がほぼ等しいことを特徴とする、請求の範囲第1項ないし第4項のいずれかに記 載の、エレメント。
  6. 6.受容空間(7)が、ボア(8)とは反対側の、中空球状セグメント(9)に 隣接する部分において円筒状に形成されることを特徴とする、請求の範囲第1項 ないし第5項のいずれかに記載の、エレメント。
  7. 7.圧力エレメント(18)が、外径が円筒状セグメント(11)の内径にほぼ 等しい円筒状部分を有することを特徴とする、請求の範囲第6項に記載の、エレ メント。
  8. 8.圧力エレメント(18)が、受容のためのスリットに対応するスリット(2 0,21)を有し、その底部は、ロッドを保持するナットをねじ止めする際に中 空球状セグメントの方向においてさらなるせん断応力が頭部にかかるように、頭 部と係合する端縁とは離れていることを特徴とする、請求の範囲第3項ないし第 7項のいずれかに記載の、エレメント。
JP2510850A 1989-07-20 1990-07-19 ペディケルねじのための受容部分とペディケルねじ Pending JPH04506759A (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3923996.9 1989-07-20
DE3923996A DE3923996A1 (de) 1989-07-20 1989-07-20 Aufnahmeteil zum gelenkigen verbinden mit einer schraube zum bilden einer pedikelschraube

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JPH04506759A true JPH04506759A (ja) 1992-11-26

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JP2510850A Pending JPH04506759A (ja) 1989-07-20 1990-07-19 ペディケルねじのための受容部分とペディケルねじ

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US (1) US5207678A (ja)
EP (1) EP0483242B1 (ja)
JP (1) JPH04506759A (ja)
AT (1) ATE121921T1 (ja)
CA (1) CA2064222A1 (ja)
DE (2) DE3923996A1 (ja)
DK (1) DK0483242T3 (ja)
ES (1) ES2074578T3 (ja)
WO (1) WO1991001115A1 (ja)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3923996A1 (de) * 1989-07-20 1991-01-31 Lutz Biedermann Aufnahmeteil zum gelenkigen verbinden mit einer schraube zum bilden einer pedikelschraube
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ATE121921T1 (de) 1995-05-15
US5207678A (en) 1993-05-04
DE3923996A1 (de) 1991-01-31
WO1991001115A1 (de) 1991-02-07
ES2074578T3 (es) 1995-09-16
DE59009029C5 (de) 2009-05-28
DK0483242T3 (da) 1995-07-17
DE3923996C2 (ja) 1993-08-26
CA2064222A1 (en) 1991-01-21
EP0483242B1 (de) 1995-05-03
EP0483242A1 (de) 1992-05-06
DE59009029D1 (de) 1995-06-08

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