JPH02198549A - 外傷治療で用いられる脊椎骨の骨接合具用インプラント - Google Patents

外傷治療で用いられる脊椎骨の骨接合具用インプラント

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Publication number
JPH02198549A
JPH02198549A JP1163602A JP16360289A JPH02198549A JP H02198549 A JPH02198549 A JP H02198549A JP 1163602 A JP1163602 A JP 1163602A JP 16360289 A JP16360289 A JP 16360289A JP H02198549 A JPH02198549 A JP H02198549A
Authority
JP
Japan
Prior art keywords
plug
rod
implant
main body
implant according
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.)
Granted
Application number
JP1163602A
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English (en)
Other versions
JPH0817782B2 (ja
Inventor
Ranuwa Raoult
イヴ コトレ
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.)
FAB DE MATERIEL ORTHOPEDIQUE SOC
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FAB DE MATERIEL ORTHOPEDIQUE SOC
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Publication of JPH0817782B2 publication Critical patent/JPH0817782B2/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
    • 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 or setting implements
    • 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, e.g. 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
    • 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 or setting implements
    • 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, e.g. 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • 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 or setting implements
    • 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, e.g. stabilisers comprising fluid filler in an implant
    • A61B17/7049—Connectors, not bearing on the vertebrae, for linking longitudinal elements together

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Neurology (AREA)
  • Surgery (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)
  • Surgical Instruments (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】 産業上の利用分野 本発明は、骨接合(osteosynthesis) 
に用いられるインプラント、特にを柱接合具用インプラ
ントに関するものである。
上記のインプラントは、骨に固定(投錨)するための部
分と、ロッドを取りつけるための本体とで構成され、こ
の本体は2つの分岐部に分かれ且つ後部に向かって開い
た溝が形成されており、この溝は、さらに、上記ロッド
が収容できるように本体の両側に向かって開いている。
上記の骨に固定(投錨)するための部分は、例えば、適
当な形のネジまたはブレードで構成することができる。
従来の技術 公知のインプラントの上記本体は、閉じているか、後側
が開いているか、両側方が開いていた。
これらのインプラントは、以下の欠点がある。
(1)本体の形式として3つの異なる型があるために、
取付けに必要な部材の数が非常に多くなる。
(2)例えばフランス国特許第2.545.350号(
83707,450)に記載のような、後側が開いた本
体の場合には、追加の取付は要素によって構成された溝
内固定具を使用する必要があり、この追加の取付は要素
を予めロッドに取り付けておかなければならない。
(3)本体が閉じているインプラントの場合には、ロッ
ドを差し込むのはかなり難しい。
(4)本体が開いたインプラントの場合には、正確に位
置決めしなければならず、ネジを使用する際に医師に不
便を強要する。
(5)使用する部材が多様で複雑であるため、かなりの
補助具を使用することが必要である。
(6)大きくて不便である。
(7)インプラント要素の製作は難しく、コストがかか
り、特に、外す場合には切断加工が必要なため、取外し
が困難である。
発明が解決しようとする課題 本発明の目的は、これらの欠点のないインプラントを提
供することにある。
課題を解決するための手段 本発明に従うインプラントは、本体の後端を構成してい
る2つに分かれた分岐部の内壁に形成された雌ネジにネ
ジ込まれるように構成されたプラグを具備し、このプラ
グがネジ込まれた側で上記の溝が閉じられ、2つの直径
方向反対側のるエツジでロッドと当接している。ロッド
の方を向いたプラグの面には、プラグをロッドに対して
並進運動および回転運動しないように係止・固着する手
段が設けられている。
上記分岐部の内壁に形成されたネジによって本体の分岐
部の甲にプラグがネジ込まれるので、インプラントは非
常に小さい寸法となる。
可能な実施例の1つでは、上記係止・固着手段は、プラ
グの他の部分と一体に形成された中心尖端を具備してい
る。
変形として、この係止・固着手段は、プラグの面から突
出して周囲に形成された外周リングで構成するか、また
は、この外周リングと中心尖端との組合せで構成するの
が好ましい。
本発明の他の特徴および利点は添付図面を参照した、以
下の説明により理解されるであろう。しかし、本発明は
これらに実施例に制限されるものではない。
実施例 第1図から第6図に示されたインプラントは、骨接合用
器具(osteosynthesis device)
、特に脊椎骨接合用器具の構成の一部である。
このインプラントは、骨に固定(投錨)するための部分
(図示した例では湾曲ブレード1で構成されている−こ
れ自体は公知であるので説明は省略する)と、ロッド3
に取付けるための本体2とで構成されている。このロッ
ド3の表面は平滑であるか、ダイアモンド状の切り込み
(ローレフト)を付けた粗面になっている。
本体2は、ブレード1の終端部分から始まる2つの側方
分岐部4で構成され、この分岐部4は、円錐形部分5を
介してブレード1に結合されている。2つの分岐部分4
の間には溝6が形成されており、上記ロッド3はこの溝
6の丸い底部7に収容される。この溝6の丸い底部7と
反対の側は開いている。また、ロッド3を上記分岐部4
の間に収容するために、溝6は分岐部4の両側でも開い
ている。
上記インプラントはプラグ8を具備している。
このプラグ8には、上記2つの分岐部4の内壁に形成さ
れた雌ネジ11と螺合できるようなネジ9が形成されて
いて、溝6のプラグ8側がこのプラグ8によって閉じる
ことができるようになっている。
また、このプラグ8には、プラグ8が完全に雌ネジ9に
ネジ込まれたときに、ロッド3に当接してロッド3中に
食い込む(第3図)直径方向両側の2つのエツジが設け
られている。
本発明の付加的な特徴によれば、プラグ8のロッド3側
を向いた面8aには、プラグ8をロッド3に係止し且つ
固着させて並進運動と回転運動を阻止する手段が設けら
れている。
図示した実施例では、この係止手段が、プラグ8の他の
部分と一体に形成された中心尖端12と、面8aから突
出した外周リング13とで構成されている。この外周リ
ング13は、断面が三角形で、好ましくは頂点13aが
丸くなっており、プラグ8の他の部分と一体に形成され
ている。
外周リング13および中心尖端12と反対側のプラグ8
後部には一定の輪郭の穴14が形成されていて、適当な
工具を用いて雌ネジ11にプラグ8をネジ込むごとがで
きるようになっている。この穴14は例えば六角形にす
ることができる。インプラントの本体の2つの側面すな
わち分岐部4の雌ネジ11とプラグ8の雄ネジ9は、鋸
歯ピッチとすることができる。こうすることによって、
プラグ8をネジ込んだ場合の荷重の半径方向成分が完全
に除去され、2つの分岐部4が開かないようにすること
ができる。
プラグ8のロッド3の方を向いた面8aには、粗面部分
15(第6図参照)が設けられている。この粗面部分は
、斜線部分15aが、プラグ8の締まる方向に向いた鋸
歯状断面形状を有しているのが有利である。プラグ8は
、冷間加工、例えば冷間鍛造で製作できる。これらの加
工方法で作られたプラグ8は、切削加工で製作されたロ
ッド3よりも大きい硬度を有している。
固定ブレード1と、本体2と、プラグ8は生体適合性の
良い同じ材料、例えばフランス規格協会(AFNOR)
規格AS  I  Z2  CND 17.13に相当
するアメリカ規格協会(ANSI>規格316L鋼、で
作られている。
インプラントの組立は、上述のように非常に簡単である
。最初にロッド3を分岐部4の間から溝6中にロッド3
が底部7に当接するまで挿入する。
次に、プラグ8を雌ネジ11に途中までネジ込む。
インプラントには収縮力、圧縮力、ねじれ応力が加わる
。次いで、穴14に合った工具でプラグ8を締めてイン
プラントを固定する。最後に、プラグ8を中心尖端12
と外周リング13がロッド3に食い込むまで締め込んで
最終固定する。このように、プラグ8の中心尖端12と
外周リング13がロッド3に食い込むのは、プラグ8を
構成している材料の硬度が、ロッド3の材料の硬度より
も大きいことによる。この結果、尖端12および外周リ
ング13によって全体がゆるむのが防止される。尖端1
2と外周リング13の直径方向両端部は上記粗面部分1
5とともにロッド3中に埋め込まれる。
これらの作業の結果、ロッド3は回転運動と並進運動に
対して固定され、尖端12と外周リング13がナツト保
持として働いて固定の安全性を確保する。
第8図および第9図は、脊椎骨の一つ25(第7図)が
骨折しているを椎10に上記の骨接合器具を使用した場
合の取付は状態を示している。この骨接合装置は、横断
ロッド22と、各ロッド3に取付けられたフック23と
を有する2個の安定兼横方向牽引用器具20 (DTT
>を具備している。この場合の骨接合は、第1図から第
4図を参照して説明したものと類似のインプラント18
および19によって完成されている。インプラント19
は、骨に固定する部分が前記の湾曲ブレード1ではなく
、ネジ付きロッド21で構成されているところが異なっ
ている。各インプラント18および19は、ロッド3に
沿って、適切に配置されている。
発明の効果 本発明によるインプラントは、以下の利点がある。
(1)溝内固定具のような複雑な部材を必要とせずにロ
ッド3をインプラントの本体後部に直接挿入できる。
(2)ネジ込みインプラントの場合には、圧縮および収
縮させる(すなわち、を椎または骨の一部を伸張させる
)際に、従来方式の円錐形インプラントでは、正確な方
向付けが必要であったが、本発明では、頭部の方向を決
める必要がない。
(3)従来は、複数タイプの本体が使用されていたが、
本発明では後部が開いた1種類の本体に減るので、骨接
合具の取付けが大幅に簡便になり、それと同時に補助具
も簡単になる。
(4)プラグ8が分岐部4の内側の雌ネジ11にネジ込
まれ、更にインプラントの本体2が円筒形であるため、
インプラントの寸法が相当小さくなる。
(5)分岐部4の雌ネジ11が、分岐部4の内側に形成
されているので、インプラントの作業中に雌ネジ11を
傷める危険がまったくない。
(6)尖端12と外周リング13がプラグ8と一体に形
成されているので、プラグと、それと別部品の固定ネジ
とを用いたインプラントに比較して、必要部品数が減少
し、必要な作業が減少し、組立も外科医にとって簡単に
なる。
(7)器具を再組立する(若い患者の成長によってこの
作業が必要となる)または単純に取り外すことができる
。取り外しは、特に外傷の治療において必要である。実
際、本発明のインプラントはプラグ8をゆるめることで
非常に簡単に分解できる。
(8)従来の閉じた本体にロッドを挿入することは難し
いが、本発明ではインプラントにロッドを挿入すること
が容易である。
変形としては、プラグに尖端12のみ、または外周リン
グ13のみを設けることができる。
【図面の簡単な説明】
第1図は、骨接合具のロッドに取り付けられた本発明に
よるインプラントの1実施例の斜視図であり、 第2図は、第1図のインプラントのロッドの軸方向にお
ける正面図であり、プラグは本体から外してあり、 第3図は、ロッドを組み込んだインプラントの垂直横断
面図であり、 第4図および第5図は、インプラントのプラグの軸断面
図および斜視図であり、 第6図は、プラグのロッドの方向を向く面の平面図であ
り、 第7図は、脊椎骨の一つが骨折しているを椎の身体の正
中面から見た図であり、 第8図は、本発明のインプラントを用いた骨接合具によ
り治療された第7図の骨折部分の正面から見た図であり
、 第9図は、第8図の骨接合具を身体の正中面から見た図
である。 12・ ・ ・ I4・ ・ ・ I8.19・ 20・ ・ ・ 23・ ・ ・ 代理 尖端、   13・・ 穴、 ・・インプラント、 牽引具、  22・・ フック 人

Claims (9)

    【特許請求の範囲】
  1. (1)骨に固定される部分(1)と、ロッド(3)に取
    り付けられる本体(2)とで構成され、この本体には本
    体後側に向かって開いた溝(6)が形成されており、こ
    の溝によって本体は2つの分岐部(4)に分けられ、さ
    らに、ロッド(3)を収容するためにこの溝(6)は本
    体の両側で開いているような骨接合具用、特に脊椎骨接
    合具用のインプラントにおいて、 本体(2)の後端を構成する上記2つの分岐部(4)の
    内壁に形成された雌ネジ(11)にネジ込み可能なプラ
    グ(8)を具備し、このプラグ(8)はその直径方向反
    対側の2つのエッジがロッド(3)と当接するように溝
    (6)のネジ込まれた側を閉じ、このプラグ(8)のロ
    ッド(3)の方向を向いた面(8a)にはプラグ(8)
    をロッド(3)に係止して固着させる手段が設けられて
    おり、この係止・固着手段によってロッドの並進運動と
    回転運動とが固定されることを特徴とするインプラント
    。
  2. (2)前記係止・固着手段がプラグ(8)の他の部分と
    一体に形成された中心尖端(12)を含むことを特徴と
    する請求項1に記載のインプラント。
  3. (3)前記係止・固着手段がプラグ(8)の面(8a)
    から突出した外周リング(13)を含み、この外周リン
    グ(13)は断面が三角形で、好ましくは頂点(13a
    )が丸くなっており、プラグ(8)の他の部分と一体に
    形成されていることを特徴とする請求項1に記載のイン
    プラント。
  4. (4)前記係止・固着手段が中心尖端(12)とプラグ
    (8)の面(8a)から突出した外周リング(13)を
    含み、該尖端と外周リングがプラグの他の部分と一体に
    形成されていることを特徴とする請求項1に記載のイン
    プラント。
  5. (5)固定部(1)、本体(2)およびプラグ(8)が
    生体適合性の良い同じ材料で作られていることを特徴と
    する請求項1〜4のいずれか一項に記載のインプラント
    。
  6. (6)プラグ(8)をネジ込んだ場合の荷重の半径方向
    成分を除去するために、本体(2)の2つに分かれた分
    岐部(4)の雌ネジ(11)とプラグ(8)の雄ネジ(
    9)とが、鋸歯ピッチであることを特徴とする請求項1
    〜5のいずれか一項に記載のインプラント。
  7. (7)プラグ(8)がロッド(3)の方を向く面(8a
    )に、粗面部分(15)を有することを特徴とする請求
    項1〜6のいずれか一項に記載のインプラント。
  8. (8)前記粗面部分(15)が、斜辺部分(15a)が
    締まる方向に向いた鋸歯状に形成されていることを特徴
    とする請求項7に記載のインプラント。
  9. (9)プラグ(8)が、冷間加工、例えば冷間鍛造で、
    製作され、切削加工で製作されたロッド(3)よりもか
    なり大きい硬度を付与されていることを特徴とする請求
    項1〜8のいずれか一項に記載のインプラント。
JP1163602A 1988-06-24 1989-06-26 外傷治療で用いられる脊椎骨の骨接合具用インプラント Expired - Lifetime JPH0817782B2 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8808538 1988-06-24
FR8808538A FR2633177B1 (fr) 1988-06-24 1988-06-24 Implant pour dispositif d'osteosynthese rachidienne, notamment en traumatologie

Publications (2)

Publication Number Publication Date
JPH02198549A true JPH02198549A (ja) 1990-08-07
JPH0817782B2 JPH0817782B2 (ja) 1996-02-28

Family

ID=9367706

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JP1163602A Expired - Lifetime JPH0817782B2 (ja) 1988-06-24 1989-06-26 外傷治療で用いられる脊椎骨の骨接合具用インプラント

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EP0348272A1 (fr) 1989-12-27
DE8915443U1 (de) 1990-06-13
ES2025850T3 (es) 1992-04-01
US5005562A (en) 1991-04-09
DE68900228D1 (de) 1991-10-02
JPH0817782B2 (ja) 1996-02-28
FR2633177B1 (fr) 1991-03-08
EP0348272B1 (fr) 1991-08-28
FR2633177A1 (fr) 1989-12-29

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