JP4395284B2 - シャンクおよび保持要素を有する要素 - Google Patents

シャンクおよび保持要素を有する要素 Download PDF

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JP4395284B2
JP4395284B2 JP2002070092A JP2002070092A JP4395284B2 JP 4395284 B2 JP4395284 B2 JP 4395284B2 JP 2002070092 A JP2002070092 A JP 2002070092A JP 2002070092 A JP2002070092 A JP 2002070092A JP 4395284 B2 JP4395284 B2 JP 4395284B2
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thread
screw
rod
holding element
radius
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JP2002330976A5 (ja
JP2002330976A (ja
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ルッツ・ビーダーマン
デッツォ・ジェツェンスキー
ユルゲン・ハルムス
ヘルマー・ラップ
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Biedermann Motech GmbH and Co KG
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • 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, setting implements or the like
    • 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • 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, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone 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, e.g. tourniquets
    • 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, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone 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

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Neurology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Engineering & Computer Science (AREA)
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  • General Health & Medical Sciences (AREA)
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  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)

Description

【0001】
この発明は、ロッドへの接続のための、脊柱または災害外科診療において用いられる要素に関する。
【0002】
米国5,129,388から公知の茎ねじは、ロッドを収容するため、2つの自由な脚を規定するU字型の窪みを有するヘッドを含み、脚にはロッドを固定するための固定ねじを受ける内側ねじ山が設けられる。脚が広がるのを防ぐため、脚にかぶせられるキャップが設けられる。
【0003】
米国5 005 562から公知の茎ねじについては、特許請求項1のプリアンブルに従い、内側ねじ山および鋸歯ねじ山としてそれと協働するねじのねじ山を構成し、こうして、ねじ止めの間の力の径方向の成分を完全に排除することにより、2つのフランクから外への広がりを回避する。
【0004】
この種類の鋸または鋸歯ねじ山は、マイヤー(Meyer)の“Enzyklopadisches Lexikon, Mannheim, 1974, p302”から公知である。インプラントに関する、米国5 605 458および5 607 304の両明細書から公知のこの種類のインプラントについては、体内、特に股関節のインプラントに導入されまた、荷重を支えるフランクがねじ山の軸に対して90°だけでなく負の角すらなして構成されるように鋸状ねじ山を構成する。これは、ねじ山によって得られる接続が、接続部分の径方向の相対的な動きに抗し、したがってインプラントのよりしっかりとした固定を保証するのを達成すると考えられる。EP−A−1 128773から公知の茎ねじでは、ロッドを収容するヘッドの内側ねじ山が切込ねじ(negative thread)を有しかつ、それと協働するねじが対応して構成される。
【0005】
この発明の目的は、上述の欠点を回避するのに好適な、最初に述べられた種類の要素を作製することである。特に、この種類のマウントの開放端の曲がりおよびしたがってねじとロッドとの間の接続の緩みが回避される。
【0006】
この目的は、特許請求項1に特徴付けられる要素によって達成される。
この構成は、露出される脚と内側ねじ山との間の力の作用が、保持要素の開放端が外向きに押されず、代わりに内向きに引っ張られることにより、協働する要素の間で強力な接続がなされるように生じるという利点を有する。
【0007】
この発明のさらなる特徴および利点は、図面を用いた実施例の説明から明らかになる。
【0008】
【詳細な説明】
骨接合用ねじ(bone screw)としても一般的に用いられるかまたはフックとして構成可能であるのが当然の、図1に従う茎ねじは、ねじ山シャンク1およびヘッド2を有する。ヘッド2はU字型の窪み4を有し、これは、ねじの縦方向の軸3の方向におよび予め定められた深さを備えて延びる。これにより構成された2つの脚5、6上に、脚の開放端7から始まる内側ねじ山8が設けられる。内側ねじ山8に一致してねじ9が設けられ、その外側ねじ山は、内側ねじ山8と協働するように構成される。
【0009】
動作において、ねじに接続されるロッド10は、これがU字型窪みのベースの上で止まるようにU字型の窪み4の中に置かれる。次にねじ9がそれに対して十分深くねじ止めされて、U字型の溝の中に位置されるロッド10に十分な停止圧力を加える。
【0010】
図2および図3によりはっきりと見られるように、ヘッド2の内側ねじ山およびねじ9の外側ねじ山は、鋸状ねじ山のように構成される。固定されるべきロッド10と反対の表面11上に、ねじ9は、ねじ回しの挿入のためのスリットまたは六角形の窪みを有する。
【0011】
ねじ山の中に、各々の場合、2つの隣接する部分フランク12、13がねじ山ピッチを形成する。2つの部分フランク12、13はフランク角βを囲む。開放端7に面するフランク側13は、縦方向の軸3に垂直に延在しかつねじ山のベース23上のフランク側13と交差する(図3参照)平面40とともに正の角β1を囲む。開放端と反対向きの部分フランク12は、図3に示される態様で、対応する平面41とともに負の角β2を囲むように傾けられる。図面からわかるように、ねじ9のねじ山はこれに対応して作られるため、ねじ9のピッチは内側ねじ山8とぴったり係合する。したがってねじ9の中では、開放端7または表面11に面する各々のフランク26は負の角β2を形成し、これが対応するフランク12と協働する。
【0012】
図4に示される実施例は、内側ねじ山8およびそれと協働するねじ9ならびにロッド10の構成において等しく対応する。対応する特徴は同じ参照番号で特徴付けられる。
【0013】
第1の実施例に対して、ここでは、いわゆる多軸ねじが存在する。ここでは、ねじ山シャンク1は、球状のヘッド14を介して受部15に接続される。受部は、一方端に、軸方向に対称に整列された第1のボア16を有し、その直径は、ねじ山セクション1の直径よりも大きくかつヘッド14の直径よりも小さい。受部は同軸の第2のボア17をさらに有し、これは、第1のボアと反対に位置された端で開きかつその直径は、ねじ要素が開放端を通り、そのねじ山セクションが第1のボアを通りかつヘッド14が第2のボアのベースまで導かれるように十分に大きい。第1および第2のボアの間に、小さな同軸のセクションが設けられる。これは第1のボアと直接に境をなし、開放端に向いた球状体として構成される。半径は、ヘッド14のボール状セグメント形状のセクションの半径と実質的に等しい。内側ねじ山8はここでも、脚5、6の開放端7で境をなして設けられる。受部15は、部分の中心と対称に配置されたU字型窪み18をさらに有し、そのベースは第1のボアの方に向き、その2つの側の脚5、6は開放端7に向けて延在する。さらに、第2のボア17の中に、球状ヘッド14上に位置されて圧力要素が置かれる。動作においては、U字型窪みの中にロッド10が挿入される。次に、ねじ9は、それが圧力要素19およびしたがってヘッド14に所望の圧力を加えてそれを止めるまで、図2に示されるのと同様に回されかつねじ止めされる。
【0014】
ヘッドまたは受部が各々の場合に骨接合用ねじに接続される上述の実施例の代わりに、ヘッドまたは受部は、脊柱の後の骨突起部を繋ぐ(hooking)ため、脊柱外科診療で用いられるように、フックにも接続可能である。
【0015】
鋸状ねじ山について上に述べられるとき、これは、部分フランクの方向を特徴付けるとされるだけである。三角形のねじ山、丸いねじ山および台形のねじ山の場合と同じように、丸まった先端および丸まったベースを有するねじ山、先の尖ったねじ山および先の尖ったねじ山ベースならびに平らなねじ山エッジおよび平らなねじ山ベースも含まれる。
【0016】
図2に示されるようにねじがロッドを押さえ、1つの力の成分がねじの開放側11に向かって作用しかつ第2の力の成分が各々の場合に外向きに作用するメートルねじを含む公知のねじの場合に対して、この発明に従う上述のねじ山の場合はここでも、1つの成分は開放端7に向けて作用するが、第2の成分は縦方向の軸3の方向に作用する。これにより、露出された脚5、6は外向きに押されず、対称な軸に向けて引張られるという結果になる。
【0017】
図5では、図2のように、図1に示された茎ねじのヘッドが、ロッドを挿入されておよび内側ねじ山8に最初だけ挿入されて、示される。図6では、図5のセクションVIがより詳細に図示される。この拡大された図からわかるように、内側ねじ9および脚5の外側ねじ山は、以下のように互いに対して寸法決めされる。縦方向の軸3に一致するねじの中心からねじ9のねじ山のベース21への半径r1は、対称な軸3と一致する保持要素の中心軸からそのスパイラル20の先端への半径r2よりも小さい。縦方向の軸3と一致するねじの中心からねじ9のスパイラル22の先端への半径r3は、縦方向の軸3と一致する保持要素の中心軸からその内側ねじ山のねじ山のベース23への半径r4よりも小さい。
【0018】
特に図6に見られるように、保持素子の露出された脚5、6およびねじ9が荷重なしに係合され、正のフランク角を有する、ねじのおよび内側ねじ山の協働するフランク13、24が互いに隣接すると、各々の場合に互いに面し、負のフランク角を有するフランク12、26の間に空隙25ができる。
【0019】
図7は図5および図6と同じものを示す。ここでは、ねじ9はそれに対して十分に深く内向きにねじ止めされてロッド10を押さえ、それにより、ねじ9に対して、矢印27で示される抗力を加える。この結果、図8に見られるように、各々の場合に互いに面するフランク12、26はこれにより、負のフランク角β2をなして互いの上に来て、それにより、内側ねじ山のスパイラル28、29は、図8に示された態様で、図9のねじ山のピッチのそれぞれのベース21に向けて内向きに引張られ、この結果、露出された脚は外向きにではなく内向きに偏る。
【0020】
好ましい実施例では、半径r1およびr2の測定値の間の差は、ねじの直径が5から12mmの場合、ねじ山の外径の約1から5%または0.1から0.5mmである。
【図面の簡単な説明】
【図1】 2等分された分解図中の単軸の茎ねじの側面図である。
【図2】 ロッドおよびナットを挿入された、図1に示された茎ねじのヘッドを示す図である。
【図3】 拡大された縮尺で図2に示された詳細IIIを示す図である。
【図4】 多軸ねじについての、図2で選ばれた図に対応するセクションを示す図である。
【図5】 ロッドを挿入され、内側ねじに緩くねじ止めされた、概略的に図示された保持要素を示す図である。
【図6】 拡大された縮尺で図5の詳細VIを示す図である。
【図7】 内側ねじが締められた後の、図5に示された図に対応する図を示す図である。
【図8】 拡大された縮尺で図7に示された詳細VIIIを示す図である。
【符号の説明】
1 ねじシャンク、2 ヘッド、4 U字型窪み、8 内側ねじ山。

Claims (2)

  1. ロッド(10)への接続のため、シャンク(1)と、それに接続された保持要素(2)と、ねじ(9)と備える要素であって、
    前記保持要素(2)は、開放端(7)を有する2つの脚(5,6)を備え前記ロッド(10)を収容するためU字型の断面を有する窪み(4)と、前記脚(5,6)上の内側ねじ山(8)とを有し
    前記ねじ(9)、前記内側ねじ山(8)と協働して直接的にまたは間接的にロッド(10)に作用し、
    互いに隣接する2つのフランク(12,13)を有する内側ねじ山(8)上で、前記開放端(7)と反対の側を向くフランク(12)、ねじ山のベース(23)を通りかつ中心軸(3)に垂直に延びる平面とともに負のフランク角β2を囲み、
    内側ねじ山(8)と協働する前記ねじ(9)は前記内側ねじ山(8)に一致する外側ねじ山を有し、
    中心軸(3)からねじ(9)のねじ山のベース(21)への半径(r1)は、中心軸(3)から前記保持要素(2)のスパイラルの先端(20)への半径(r2)よりも小さく、
    中心軸(3)からねじ(9)のスパイラルの先端(22)への半径(r3)は、前記保持要素(2)の中心軸(3)からその内側ねじ山(8)のねじ山のベース(23)への半径(r4)よりも小さくなっており
    前記保持要素(2)前記脚(5,6)ねじ(9)抗力なしに係合されることによって正のフランク角β1を有して協働するフランク(13,24)が互いに当接すると、負のフランク角β2を有しかつ互いに面するフランク(12,26)の間に空隙(25)ができる、要素。
  2. (5,6)のねじ山のベース(23)は、丸く構成されることを特徴とする、請求項1に記載の要素。
JP2002070092A 2000-12-27 2002-03-14 シャンクおよび保持要素を有する要素 Expired - Lifetime JP4395284B2 (ja)

Applications Claiming Priority (3)

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DE10065396 2000-12-27
EP01106711A EP1219255B1 (de) 2000-12-27 2001-03-16 Schraube zum Verbinden mit einem Stab
EP01106711:3 2001-03-16

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JP2002330976A5 JP2002330976A5 (ja) 2005-07-28
JP4395284B2 true JP4395284B2 (ja) 2010-01-06

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JP (1) JP4395284B2 (ja)
KR (1) KR100687089B1 (ja)
DE (1) DE50100793D1 (ja)
TW (1) TWI235794B (ja)

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TWI235794B (en) 2005-07-11
KR100687089B1 (ko) 2007-02-27
US20070055238A1 (en) 2007-03-08
EP1219255A1 (de) 2002-07-03
DE50100793D1 (de) 2003-11-20
KR20020073427A (ko) 2002-09-26
US7018378B2 (en) 2006-03-28
US20020138076A1 (en) 2002-09-26
JP2002330976A (ja) 2002-11-19
EP1219255B1 (de) 2003-10-15

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