JP3509103B2 - 椎骨間融合用インプラント - Google Patents
椎骨間融合用インプラントInfo
- Publication number
- JP3509103B2 JP3509103B2 JP53026195A JP53026195A JP3509103B2 JP 3509103 B2 JP3509103 B2 JP 3509103B2 JP 53026195 A JP53026195 A JP 53026195A JP 53026195 A JP53026195 A JP 53026195A JP 3509103 B2 JP3509103 B2 JP 3509103B2
- Authority
- JP
- Japan
- Prior art keywords
- implant
- extending
- hole
- longitudinal axis
- sidewalls
- 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 - Fee Related
Links
Classifications
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- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
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- A61F2/02—Prostheses implantable into the body
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- A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
- A61F2/447—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
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- A61F2/02—Prostheses implantable into the body
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- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
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- A61F2/02—Prostheses implantable into the body
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0082—Three-dimensional shapes parallelepipedal
Landscapes
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Description
骨間の融合を容易ならしめるインプラントに関する。
の痛みに苦しむ人は、有益な楽しみや余暇活動といった
人生のあらゆる楽しみから閉め出される。背中の痛みに
係わる大きな人的コストに加えて、社会も大きな財政的
負担を負う。失われた雇用時間は、医療保険のコストと
同様、生産性にも悪影響をおよぼす。
ることが多い。椎間板に病変が生じると、対向する椎骨
は十分な支えを得られない。
従来技術として、対向する椎骨を融合させることが開発
されてきた。そのような技術においては、病変した椎間
板を除去し、その空間に骨を詰める。そのような処置
は、詰められた骨が対向する椎骨とともに成長して、そ
の対向する椎骨と融合合体することを意図している。こ
れが成功すれば、2個の対向する椎骨は強固に結合し、
椎骨間の不安定を避けることができる。
位間の融合を容易ならしめるとともに、融合進行の過程
における椎骨の安定性を図るため、外科的技術と器具が
開発されてきた。この目的で外科的インプラントが開発
されたのである。
が、1991年5月14日にマイケルソン(Michelson)に与
えられた米国特許第5,015,247号である。マイケルソン
が用いたものは、断面が円形で、全長にわたって均一な
直径の円筒状インプラントで、外面にねじが設けてあ
る。このインプラントは中空で、円筒の壁を貫通して孔
が開けられている。このインプラントは、椎骨間に用意
された場所内に配置される。この用意された場所は、椎
間板を貫通するとともに対向する椎骨の端部プレートの
一部をも貫通する孔である。インプラントはこの孔にね
じ込まれ、骨のチップ(小片)等を詰められる。
ティガン(Brantigan)に与えられた米国特許第4,834,7
57号に示されている。ブランティガンの装置は、平行六
面体の埋め栓であって、対向する椎骨間に前記六面体の
補完形状に形成されたキャビティ内に押し込まれる。
来技術の装置においては、椎骨体内部への装置の沈下を
抑止できない。沈下とは、対向する椎骨間にインプラン
トが配置された後に、インプラントが椎骨体内へ移行す
ることである。また、多くの従来技術のインプラントに
おいては、骨との直接並置は二面においてのみ行われ
る。更に、挿入の際、椎間板や軟骨質がインプラントに
入り込むという望ましくない現象も起こる。このような
従来技術の装置は、椎骨の端部プレートと接触する最低
限の表面積を持っているのが普通である。更に、これら
従来技術の装置は、その寸法け状のため、2個のインプ
ラントをひとつの共通の椎間板スペース内に近接して並
置することができない。インプラントの配置密度を上げ
るための先行技術が、1991年10月8日にロイ(Roy)に
与えられた米国特許第5,055,104号に示されている。こ
の特許において、当該装置はねじである。装置としての
この2個のネジを相互係合させて並置する。
することである。本発明の更にひとつの目的は、沈下の
少ない当該インプラントを提供することである。
椎骨間の融合を容易にするインプラントが提供される。
このインプラントは、その長手方向軸にほぼ平行な面に
沿って延在する第1と第2の支持面を有する。この第1
と第2の支持面は、ほぼ平行に間隔をあけて配置されて
いる。第1と第2の支持面からは、それぞれ第1と第2
のリッジが延在している。第1と第2のリッジにはそれ
ぞれ開口部が貫通し、インプラントの内部に連通してい
る。支持面とリッジの寸法は、第1と第2の支持面が皮
層骨に対向当接し、リッジが海綿質内へ延在するように
なっている。
り、 図1Aは、椎骨に対向する部位間装置の従来例の端面図
であり、 図1Bは、椎骨に対向する椎骨間融合装置の他の従来例
の端面図であり、 図1Cは、2個の椎骨間に配置された部位間装置の側面
図であり、 図2は、本発明のインプラントの前方右上からの見取
り図であり、 図3は、図2のインプラントの尾部の立面図であり、 図4は、図3の4−4断面図であり、 図5は、図4の破断面見取り図であり、 図6は、図2のインプラントの側面図であり、 図7は、図6の7−7断面図であり、 図8は、図2のインプラントの平面図であり、 図9は、図6のアンカー詳細の部分拡大図であり、 図10は、相互間に孔をあけてから、図2のインプラン
トを挿入するため引き離された2個の椎骨の端面図であ
り、 図11は、図10の孔へ、図2のインプラントを挿入した
状態を示す図であり、 図12は、対向する椎骨間に2個のインプラントを挿入
した、図11と類似の図であり、 図13は、2個の椎骨間に挿入されたインプラントの横
断面図であり、 図14は、図示の目的で誇張した曲面を有する図13のイ
ンプラントを示す略図であり、 図15は、インプラントの別の実施例を示す見取り図で
あり、 図16は、インプラントを孔に配置するための工具を示
す図である。
かの図面を参照して、本発明発明の好ましい実施例を説
明する。
個の椎骨間の融合を容易にすることを意図している。図
1は略図であり、上側の椎骨10と下側の椎骨12を示す。
両椎骨10、12は、垂直方向に整列し、対向する端部プレ
ート10a、12aを呈する。端部プレート10a、12aは、椎間
板14によって隔てられている。椎間板14は繊維状の内部
質16を含む。椎間板14の周縁は繊維質であり、環18と呼
ばれている。両椎骨10、12の内部は柔らかい海綿状骨10
b、12bから成る。端部プレート10a、12aにおいて、椎骨
10、12は硬い皮層骨層10c、12cを含む。皮層骨層の厚さ
Tは、通常は約2mmである。
入れるため、端部プレート10a、12aの皮層骨10c、12cを
貫通して、対向する椎骨10と12の間の椎間板スペースを
貫通する孔を設けることが望ましい。その結果、椎骨1
0、12の海綿状骨10b、12bは露出してインプラントに対
向する。このような海綿状骨10b、12bには多数の血管が
あるので、海綿状骨の露出は望ましい。海綿状骨は成長
がもっとも速く、脊柱融合療法の完了と同時に椎骨10、
12を結合する骨の成長を形成する。
ことが望ましいが、海綿状骨は比較的柔らかく、荷重負
担の目的のためには望ましくないのでインプラントを海
綿状骨に対向させると、沈下の確率が増大する、。
ントに関する欠点と問題点とが図1A、1B、1Cを参照する
とよく理解できる。図1Aは、上側の椎骨10'に形成され
た孔102'内に配置されたインプラント100'を示す。図示
の便宜上、下側の椎骨は図1Aには示さないが、下側の椎
骨にも上側の椎骨10'と同様に孔があけられていること
が理解できるであろう。図1Aに示した椎骨間インプラン
ト100は、米国特許第5,015,247号に示されたもののよう
に、ほぼ円筒形のねじ付きインプラントである。孔102'
は、インプラント100'を受け入れるための円筒サイズの
円弧である。そのように形成されているので、端部プレ
ート10a'の海綿状骨10c'には、インプラント100'に対向
する傾斜面10d'が設けられる。両表面10d'は、インプラ
ント100'が海綿状骨10c'に支持される場所であるので、
最大支持面積である。残念ながら、表面10dの面積は、
インプラント100'の全面積に比べると小さい。表面10d'
が傾斜しているため、インプラント100'は、端部プレー
ト10a'に対して滑りやすい。このような滑りが発生する
と、柔らかい海綿状骨10b'内へのインプラント100'の沈
下が発生する。この沈下によって、椎間板スペースが崩
れ、手術以前の状態に戻ってしまう。
プラント100"の断面図である。インプラント100"の断面
は実質的に方形である。椎骨10"には、補完形状の孔10
2"があけられている。その結果、端部プレート10a"の皮
層骨10c"は、ほぼ垂直な面10d"においてインプラント10
0"に対向している。この例においては、皮層骨10c"は、
インプラント100"が海綿状骨10b"内へ移行するのを妨げ
る支持面を提供してはいけない。
へ移行するのを防ぐため、従来技術の装置の中には、椎
骨の皮層骨面にインプラントが乗るような寸法としたも
のがある。例えば、図1Cに示すインプラント100'''(そ
の断面は円筒形または方形)は、上側の椎骨10'''と下
側の椎骨12'''との間に配置されている。椎骨10'''と椎
骨12'''とはそれぞれ、皮層骨の垂直外壁10e'''、12
e'''を有する。対向する椎骨10'''、12'''間に孔102'''
が形成されている。長手方向の孔の長さは、インプラン
ト100'''の端部100a'''、100b'''が、皮層骨12e'''、10
e'''に直接対向して支持される長さである。図1Cを見る
と、インプラントが椎骨をまたぐ長さでないとインプラ
ントが海綿状骨内へ沈下するであろうことがわかるだろ
う。
るような寸法と配置であるインプラントを示す従来技術
の教示の例が、2件の米国特許第4,834,757号と第4,74
3,256号に示されている。軟らかい海綿状骨にまたがっ
て椎骨の外側皮層骨壁上に直接支えられるような寸法と
配置のインプラント技術の欠点は、インプラント配置用
の孔形成作業を、孔の長さに関して正確にコントロール
しなければならない点にある。インプラントを支える皮
層は非常に薄い(約2mm)。孔が短かすぎるとインプラ
ントを、皮層骨で支えることができない。孔が長すぎる
と、孔あけ工具が椎骨の端を突き抜けてしまう。もし前
者が発生すると、沈下の可能性が非常に大きくなる。後
者は著しく危険である。孔あけ工具が椎骨を突き抜ける
と、脊髄や大動脈などの重要な臓器を破裂または切断す
る恐れがある。そのような臓器が損傷を受けると、(麻
痺や死亡を含む)重大な結果につながる可能性がある。
を説明したので、次に本発明によるインプラントを説明
する。本発明によるインプラントにおいては、切削深さ
を精密に制御する必要性を除きつつ、皮層骨上での完全
支持を提供することが注目される。
のインプラントである。このインプラント100は、断面
がほぼ正方形の本体20を含む。この本体は長手方向軸X
−Xに沿って延在する。
24を有する。支持壁22、24には側壁26、28が接続されて
いる。支持壁22、24はそれぞれ、外側を向いた支持面22
a、24aを呈する。両支持面22a、24aは互いにほぼ平行に
かつ長手軸方向に平行に延在する。
中央部から立ち上がっている。両リッジ30、32は、軸X
−Xと平行に延在し、本体20から外方へ突出している。
リッジ30、32は、支持面22a、24aの中央に配置されてい
るので、隆起したリッジ30、32の対向側面に沿って支持
壁22、24が露出している。リッジ30、32の終端部は凹面
30a、32aとなっている。
20a、20bと側壁26、28は、補強リブ36(図4、図5参
照)によって結合されている。
して延在する。孔40は、図3と図7からよく分かるよう
に、その断面がほぼ方形である。
通して形成されている。開口部44の軸Z−Zは、長手方
向軸X−Xに対して垂直である。開口部44はそれぞれ孔
40に直接連通している。
に連通する開口部46を有する。開口部46は、軸Z−Zと
軸X−Xと相互に直角をなす軸Y−Yに沿って延在す
る。(図6と図7を参照) 壁22、24、26と28が交差するエッジには、複数のアン
カーセグメント(係止片)50が設けられている。セグメ
ント50どうしの間には、谷つまり凹部52が形成されてア
ンカーセグメント50を画成している。アンカーセグメン
ト50は、軸X−Xを取り巻く螺旋パターンの一部分であ
る。また、図3からよく分かるように、谷52は、軸X−
Xを中心とする半径R1の円弧上にある。
の断面はほぼ正方形であり、アンカーの端は、軸X−X
に平行な線に対して角度A1をなす傾斜面であり、先端20
aに向かって前方に下がっている。好ましい実施例にお
いて、角度A1は10゜である。
の全長にわたって一定ではない。図3と図8からよく分
かるように、リッジ30、32の外面30a、32aと側壁26、28
とは、それぞれ半径R2、R3の凹面である。半径R2、R3の
利点を以下詳細に説明する。R3はアンカー50の外径に等
しい。更に、先端20aにはテーパ角度A2(図6)がつけ
られ、好ましい実施例においては10゜である。
は、2個の椎骨間に形成された孔内に配置される。イン
プラントの寸法決めに対応する孔の形成は、以下で明ら
かとなる理由により重要である。従って、好ましい実施
例の説明の便宜上、現在予想されるインプラント100の
寸法を列挙する。異なるサイズの患者や、脊柱の異なる
部位に適応するため、種々のサイズのインプラント100
が利用可能であることが理解されるであろう。
416″x.216″) 3.孔46の寸法(L2xW2、図6参照):10.6mm x 3.81mm(.
416″x.150″) 4.軸X−Xから谷52までの半径R1(図3):7.5mm 5.孔40の断面寸法(W3xL3):7mm x 8mm 6.リッジ30、32の幅(W4、図3参照):7mm 7.リッジ30、32の高さ(H1、図3参照):1mm 8.側壁26、28の凹面領域の高さ(H2、図3):8mm 9.支持壁22、24の厚さ(T1、図3):2mm 10.アンカー50のピッチ(P、図9):2.3mm 11.アンカー50の厚さ(T2、図9):1mm 12.半径R2(図8):190mm 13.半径R3(図3):8.75mm 椎骨10、12の間へインプラント100を挿入するため、
今度は図10に注目する。環18を引っ張るため、椎骨10、
12を引き離す。孔102を、その円筒軸が端部プレート10
a、12aと平行に延在して、それらの中心に位置するよう
に、形成する。孔102の半径RBは、(図3の)インプラ
ント100の谷52の半径(R1)に等しくする。インプラン
ト100と孔102の寸法は、半径RBが皮層10c、12cを貫通し
て軟らかい海綿状骨10b、12b内へ過度に入り込まないよ
うに定める。
法でその軸を端部プレート10a、12a間に、それらと平行
に配置しなければならない。椎骨間にそのように正確に
孔をあけるための外科的方法とキットは、1993年2月10
日に出願され、共通に譲渡され、同時係属中の米国特許
出願08/015,863の主題である。
の先端20aから先に孔102へ挿入する。インプラント100
を軸X−X周りに回転させて、図13に示す位置まで孔10
2の中へ挿入する。あるいは、インプラント100を回転さ
せることなく、その軸X−Xに沿って打ち込んでもよ
い。インプラント100は、孔102内へ完全に挿入された状
態において、開口部44が軟らかい海綿状骨10b、12bの方
を向くように位置決めする。開口部46は、除去された椎
間板16が占めていたスペースの方に向けられる。
ンプラントの挿入後、支持面22a、24aは端部プレート10
a、12aの皮層10c、12cに直接対向当接する(図11参
照)。また、上記のような孔102の相対的寸法決めによ
り、リッジ30、32は、皮層骨層10c、12cを越えて軟らか
い海綿状骨10b、12b内へ突出する。インプラント100の
このような構造と位置決めにより、外科医は骨のチップ
を孔40へ入れることができる。従って、骨10b、12bは、
整列された孔40、44を介して形成された骨の柱によって
融合される。面22a、24aの負荷を皮層骨10c、12cが支持
するので、インプラント100の、海綿状骨10b、12b内へ
の沈下が防止される。丸みのある面がある角度でインプ
ラント100に当接する(例えば、米国特許第5,015,247
号)現行の装置、あるいはインプラントの両端以外には
端部プレート接触のない(例えば米国特許第4,834,757
号)方形と装置と異なり、支持面22a、24aはインプラン
ト100に平行である。また、現行のインプラント100は、
端部プレート10a、12aを貫通して突出して直接海綿状骨
10b、12bに接触するねじ無しリッジ30、32を有する。孔
44の表面積は、インプラント100の構造強度を確保しイ
ンプラント100を介して成長する海綿状骨の多孔性を最
大にしつつ、可能な限り大きくされる。
多くの用途において(特に脊椎の腰部において)、2個
の並列インプラントが望ましい。そのような配置を図12
に示す。図12においてはまた、インプラント100どうし
が近接していることが注目される。この近接配置は凹状
の側壁26、28によって達成される。
側壁を有するインプラントどうしは両者の軸を近接して
配置することができない。また、米国特許第5,015,247
号のねじ付き凸面側壁を有するインプラントは、接触す
ることが許されない。もし、先に挿入された第1のイン
プラントに、あとから挿入された第2のインプラントが
接触すると、第2のインプラントをねじ込むにしたがっ
て、第1のインプラントのネジを緩めてしまう。これ
は、先に挿入されたインプラントのねじが誤って緩み、
主要な血管や脊髄へ入り込むという危険性をはらんでい
る。その結果、脊柱の部位によっては、2個のインプラ
ントが望ましいにもかかわらず、1個しか挿入できない
ことになる。
配置可能であり、任意の椎間板レベルにおいて、2個の
インプラントを使用できる可能性が高まる。
を、両インプラント100の間に配置し、インプラント100
の両側においてその側壁26、28に対向させている。係合
突起は、側壁26、28の凹面に一致するように、凸状の正
確な外面202を有する。骨の係合突起200は、すべての孔
46が骨の係合突起200に直接対向するように、外側の側
壁上に配置される。この用例において、椎間板16は、イ
ンプラント100の内部に入らないよう、またインプラン
ト100を介した骨の成長を妨げないよう、骨の係合突起2
00によって阻止されている。更に、孔44、40を介しての
骨の成長により、側方の孔46を介しての骨の成長と融合
し、骨の係合突起200と融合する。従って、インプラン
ト100どうしが相互に接続されるので、椎骨10、12間の
結合が強化される。
すなわち、骨の成長が終わった後、壁30a、32aのディッ
プ(凹部)R2(図示の便宜上、図14において誇張して示
してある)および側壁26、28により、インプラント100
の、軸X−Xに沿った移動が防止される。
用しない方を好む場合、椎間板に対向する側壁開口部46
は設けず、椎間板がインプラント100に入り込み、イン
プラント100を介した骨の成長に干渉することを防止す
ることが望ましい。従って、図15は代替実施例として、
側壁28a、26aが中実で、開口部46のないインプラント10
0aを示す。従って、椎間板はインプラント100aの内部に
直接連通していない。
00を示す。この挿入工具300は、4個の枝状部300a−300
dを有する。枝状部300a−300dは、開口部44、46をカバ
ーし、厚めの枝状部300d、300bの内面301は凸状であ
り、凹面側壁26、28と補完的に接合するような寸法にな
っている。更に、薄めの枝状部300a、300cは、リッジ3
0、32の凹面30a、32aと接合するような寸法の凸面302を
有する。挿入工具300は、インプラント100の挿入中、孔
44、46をカバーし、椎間板質やその他の破片がインプラ
ント100の内部40に侵入するのを防止する。また、挿入
工具300内の装置100の表面が円筒形になり、非円筒形の
インプラント100を丸い孔102へ挿入できるように、枝状
部の外面304a−304dはほぼ円弧状である。ハンドル306
が枝状部を結合し、工具300の回転または軸方向の移動
を可能にする。
性を高めるため、孔44の表面積はできるだけ大きいこと
が望ましい。本出願人らは、動物実験と臨床経験から、
表面の多孔性が大きいほどインプラント100内への骨の
内部成長の成功の確率が高いことを発見した。
め、端部プレート10a、12a内に埋め込まれたアンカー50
を用いている。端部プレート10a、12aは皮層骨10c、12c
で形成されるので、端部プレート10a、12a内に埋め込ま
れたアンカー50は、インプラント100の偶発的は動きに
対抗するための実質的力を提供する。また、アンカー50
は、インプラント100をその軸X−Xの周りに回転して
ねじ込んだり、あるいはインプラント100と工具300とを
ハンマーなどで軸X−Xに沿って打ち込んだりすること
を可能にする。正方形断面アンカー50は、排除に対する
抵抗をもたらすように、(A1において)テーパが付けら
れている。
Claims (13)
- 【請求項1】対向する椎骨間の椎骨間融合の容易化のた
めに用いるインプラント100であって、前記インプラン
トは長手方向軸X−Xに延在する中空のインプラント本
体20を有し、前記インプラント本体20は前記長手方向軸
X−Xの両対向側に延在する第1および第2の支持面
(22、24)を有し、前記第1および第2の支持面(22、
24)はそれらを貫通して前記インプラント本体20の内部
40に連通する開口部を有し、 前記インプラントは: 前記第1の支持面22から延在する第1のリッジ30と; 前記第2の支持面24から延在する第2のリッジ32と; 前記第1および第2の支持面(22、24)の両対向のエッ
ジに配置される複数の谷52によって分離され直線状に整
列した複数の係止片(アンカー)セグメント50を有し; 前記アンカーセグメント50は、前記長手方向軸X−Xを
取り巻く螺旋パターンを画成し; 側壁26、28は、固定離間整列状態に前記アンカーセグメ
ント50を保持するために前記支持面(22、24)を結合す
る、 ということを特徴とするインプラント。 - 【請求項2】前記側壁26、28を貫通して形成され、前記
内部40に連通する前記孔46を含む請求項1のインプラン
ト。 - 【請求項3】前記側壁26、28が、それらの長手方向軸に
沿って凹状である、請求項1のインプラント。 - 【請求項4】前記側壁26、28を貫通して形成され、前記
内部40に連通する孔46を有する請求項3のインプラン
ト。 - 【請求項5】前記インプラント100は、前記椎骨10、12
間に形成された孔102内に配置されるように選択され、
前記孔102は所定の半径RBを有し、前記係止片50と谷52
の寸法は、前記長手方向軸X−Xから前記谷52までの半
径線R1が実質的に前記孔102の前記半径RBに等しくなる
ように寸法決めされる請求項1のインプラント。 - 【請求項6】前記側壁26、28はそれらの全表面領域にわ
たって実質的に中実である請求項1のインプラント。 - 【請求項7】前記側壁26、28はそれらの全表面領域にわ
たって実質的に中実である請求項3のインプラント。 - 【請求項8】前記インプラント100は、テーパを有する
前縁20aを有し、前記インプラント100の前記前縁20aに
おける断面積が、前記前縁20aから離れた前記インプラ
ント100の断面積より小さい請求項1に記載のインプラ
ント。 - 【請求項9】前記側壁26、28が、前記インプラント100
の前記長手方向軸X−Xに沿って丸みを帯びている請求
項1に記載のインプラント。 - 【請求項10】前記エッジが、第1と第2の上側エッジ
と、第1と第2の下側エッジとを含み; 前記第1の上側エッジと前記第1の下側エッジとがそれ
らの間に延在する剛性サポート26によって平行離間整列
状態に結合され; 前記第2の上側エッジと前記第2の下側エッジとがそれ
らの間に延在する剛性サポート28によって平行離間整列
状態に結合されている; 請求項1に記載のインプラント。 - 【請求項11】前記第1と第2の上側エッジ同士が剛性
サポート22、36によって平行離間整列状態に結合され、
前記第1と第2の下側のエッジ同士が剛性サポート24、
36によって平行離間整列状態に結合されている請求項10
に記載のインプラント。 - 【請求項12】前記第1と第2の上側エッジを結合して
いる前記剛性サポート24,36と、前記第1と第2の下側
エッジを結合している前記剛性サポート24、36とが、前
記インプラントの内部40に連通する開口部44を画成する
請求項11に記載したインプラント。 - 【請求項13】対向する椎骨間融合の容易化のために用
いるインプラント100と、前記インプラントの挿入を容
易にするための工具300とを備えた組み合わせであっ
て、 前記インプラント100は、 長手方向軸X−Xに延在する中空のインプラント本体20
を有し、前記インプラント本体20は前記長手方向軸X−
Xの両対向側に延在する第1および第2の支持面(22、
24)を有し、前記第1および第2の支持面(22、24)は
それらを貫通して前記インプラント本体20の内部40に連
通する開口部を有し、 前記インプラントは: 前記第1の支持面22から延在する第1のリッジ30と; 前記第2の支持面24から延在する第2のリッジ32と; 前記第1および第2の支持面(22、24)の両対向のエッ
ジに配置される複数の谷52によって分離され直線状に整
列した複数の係止片(アンカー)セグメント50を有し; 前記アンカーセグメント50は、前記長手方向軸X−Xを
取り巻く螺旋パターンを画成し; 側壁26、28は、固定離間整列状態に前記アンカーセグメ
ント50を保持するために前記支持面(22、24)を結合す
ることを特徴としており、 前記工具300は、 前記インプラント100の前記第1および第2のリッジ(3
0、32)を挟持するような寸法の枝状部(300a、300
c)、 前記インプラント100の前記側壁(26、28)を挟持する
ような寸法の枝状部(300b、300d)を備えたことを特徴
とする、 前記インプラント100と前記工具300とを備えた組み合わ
せ。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US24785794A | 1994-05-23 | 1994-05-23 | |
US08/247,857 | 1994-05-23 | ||
PCT/US1995/001655 WO1995031947A1 (en) | 1994-05-23 | 1995-02-09 | Intervertebral fusion implant |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2000505313A JP2000505313A (ja) | 2000-05-09 |
JP3509103B2 true JP3509103B2 (ja) | 2004-03-22 |
Family
ID=22936665
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53026195A Expired - Fee Related JP3509103B2 (ja) | 1994-05-23 | 1995-02-09 | 椎骨間融合用インプラント |
Country Status (12)
Country | Link |
---|---|
US (2) | US5609636A (ja) |
EP (1) | EP0760639B1 (ja) |
JP (1) | JP3509103B2 (ja) |
KR (1) | KR100231490B1 (ja) |
AT (1) | ATE191634T1 (ja) |
AU (1) | AU695466B2 (ja) |
CA (1) | CA2191089C (ja) |
DE (1) | DE69516279T2 (ja) |
ES (1) | ES2144606T3 (ja) |
HK (1) | HK1004710A1 (ja) |
NZ (1) | NZ281462A (ja) |
WO (1) | WO1995031947A1 (ja) |
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- 1995-02-09 KR KR1019960706649A patent/KR100231490B1/ko not_active IP Right Cessation
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