JP2004073548A - 椎間ケージ - Google Patents

椎間ケージ Download PDF

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Publication number
JP2004073548A
JP2004073548A JP2002239095A JP2002239095A JP2004073548A JP 2004073548 A JP2004073548 A JP 2004073548A JP 2002239095 A JP2002239095 A JP 2002239095A JP 2002239095 A JP2002239095 A JP 2002239095A JP 2004073548 A JP2004073548 A JP 2004073548A
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Prior art keywords
cage
holes
vertebral bodies
intervertebral cage
intervertebral
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JP2002239095A
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JP4088495B2 (ja
Inventor
Shinnosuke Nakahara
中原　進之介
Kazuhiro Hasegawa
長谷川　和宏
Kazuya Oribe
織部　一弥
Hiroshi Takamido
高御堂　洋
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Showa Ika Kogyo Co Ltd
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Showa Ika Kogyo Co Ltd
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Priority to JP2002239095A priority Critical patent/JP4088495B2/ja
Priority to US10/642,684 priority patent/US7135043B2/en
Priority to KR1020030057307A priority patent/KR20040017780A/ko
Priority to DE60321432T priority patent/DE60321432D1/de
Priority to EP03018957A priority patent/EP1391189B1/en
Publication of JP2004073548A publication Critical patent/JP2004073548A/ja
Priority to KR1020060047144A priority patent/KR100747678B1/ko
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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
    • 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
    • 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
    • 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
    • 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
    • A61F2/442—Intervertebral or spinal discs, e.g. resilient
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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
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    • 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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    • A61F2/00—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
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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
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    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30593—Special structural features of bone or joint prostheses not otherwise provided for hollow
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    • 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
    • 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
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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
    • 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
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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
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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
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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Neurology (AREA)
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  • General Health & Medical Sciences (AREA)
  • Transplantation (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Animal Behavior & Ethology (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
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  • Molecular Biology (AREA)
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  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Prostheses (AREA)
  • Surgical Instruments (AREA)

Abstract

【課題】脊椎の斜め前方から、椎間板を除去した後の上下の椎体間に挿入配置できる椎間ケージを提供する。
【解決手段】脊椎の椎体間に挿入配置される椎間ケージであって、中空状のゲージ本体３の先端側の厚さよりも後端側の厚さを厚く設け、前記先端側の一方の角部３Ｃの角度をほぼ二等分する二等分線に対してほぼ直交する方向に稜線１７を形成した複数の抜け止め防止用の爪状部１９を上下両面に備え、かつ後端面に形成したＶ字形状の溝部１３に、斜め上下方向のスクリュー貫通孔１５Ｕ，１５Ｌを形成し、前記スクリュー貫通孔１５Ｕ，１５Ｌは左右方向の長孔である。
【選択図】　　　図１

Description

【０００１】
【発明の属する技術分野】
本発明は、椎間板を除去した後の上下の椎体間に前側から挿入配置される椎間ケージに係り、さらに詳細には、前側の左右斜め方向から椎体間に挿入配置することのできる椎間ケージに関する。
【０００２】
【従来の技術】
本発明に係る先行例として次の特許文献がある。
【０００３】
［特許文献１］
特表平９−５０３４１６号公報
前記特許文献１に係る椎間ケージ５０は、図５に示すように、半円形状の左右一対の横スペーサ５１Ａ，５１Ｂと前後の中央スペーサ５３Ａ，５３Ｂとの４つの構成要素を組合せ、左右の固定ネジ５５によって上記４個の構成要素を一体的に固定することにより、前記左右の横スペーサー５１Ａ，５１Ｂ及び前後の中央スペーサ５３Ａ，５３Ｂとの間に、ほぼ四角形状のキャビティ５７を形成した構成である。
【０００４】
そして、図６に示すように、椎間板を除去した後の上下の椎体５９Ｕ，５９Ｌの間に、前記椎間ケージ５０を前側（図６において左側）から挿入配置するものである。
【０００５】
【発明が解決しようとする課題】
前述のごとき従来の構成においては、構成部品が多く複雑であると共に、挿入配置後に位置ずれを生じ易いという問題がある。
【０００６】
また前記従来技術においては、椎間ケージを上下の椎体の間に前側から挿入配置することを前提とするものであって、左右の斜め前方から椎体間に挿入するものではなく、さらなる改良が望まれるものである。
【０００７】
【課題を解決するための手段】
本発明は前述のごとき従来の問題に鑑みてなされたもので、請求項１に係る発明は、脊椎の椎体間に挿入配置される椎間ケージであって、中空状のゲージ本体の先端側の厚さよりも後端側の厚さを厚く設け、前記先端側の一方の角部の角度をほぼ二等分する二等分線に対してほぼ直交する方向に稜線を形成した複数の抜け止め防止用の爪状部を上下両面に備え、かつ後端面に形成したＶ字形状の溝部に、斜め上下方向のスクリュー貫通孔を形成した構成である。
【０００８】
請求項２に係る発明は、請求項１に記載の椎間ケージにおいて、スクリュー貫通孔は左右方向の長孔である。
【０００９】
【発明の実施の形態】
図１〜図４を参照するに、本発明の実施の形態に係る椎間ケージ１は、中空状のケージ本体３を備えている。すなわち、ケージ本体３は、全体が一体物であって、図２に示すように、平面図の外形は、概略的には正方形状の後辺に台形状の底辺部を合せて変形六角形状に形成し、かつ各角部を円弧状に形成した形状である。そして、上記ケージ本体３は、前端側（先端側）の厚さＨ１よりも後端側の厚さＨ２を厚く形成してある。
【００１０】
上記ケージ本体３の前側，中央部，後側には左右方向に長い前側上下孔５，中央部上下孔７及び後側上下孔９が上下に貫通して形成してある。さらに、ケージ本体３には、前記各上下孔５，７，９と左右方向の長さがほぼ等しい前後方向の穴１１（図３参照）が前面３Ｆから前記後側上下孔９に至って形成してある。
【００１１】
前記前側上下孔５，中央部上下孔７，後側上下孔９及び穴１１を形成したことにより前記ケージ本体３は中空状に形成してある。そして、前記ケージ本体３の左右の両側面の、前記前側上下孔５、中央部上下孔７，前後上下孔９に対応した位置には横貫通孔５Ａ，７Ａ，９Ａがそれぞれ形成してある。
【００１２】
さらに前記ケージ本体３の後端面には、後端側が広くなるようにＶ字形状に開口した溝部１３が形成してあり、この溝部１３には、上面及び下面に貫通した上下のスクリュー貫通孔１５Ｕ，１５Ｌが斜め上下方向に形成してある。このスクリュー貫通孔１５Ｕ，１５Ｌは、左右方向に長い長孔に形成してある。
【００１３】
そして、前記ケージ本体３の上下面には、前記先端側の一方の角部３Ｃの角度（前面３Ｆと側面とのなす角度、約９０）をほぼ二等分する二等分線に対してほぼ直交する方向の稜線１７を形成した断面三角形状の抜け止め防止用の複数の爪状部１９が適宜間隔に形成してある。すなわち、前記爪状部１９の断面三角形状の頂角の部分が前記稜線１７をなすものであって、上記爪状部１９は椎体間への挿入時には挿入し易く抜け難い形状に形成してある。
【００１４】
以上のごとき構成において、前述した従来技術と同様に、椎間板を除去した後の上下の椎体間に椎間ケージ１を挿入配置するには、例えば鉗子などのごとき適宜の工具を適宜の横貫通孔５Ａ，７Ａ，９Ａに係合してケージ本体３を保持し、当該ケージ本体３の一方の角部３Ｃが先行するように、脊椎の左前方から椎体間に挿入配置するものである。なお、上下を反転することにより、脊椎の右前方から椎体間にケージ本体３を挿入配置することができるものである。
【００１５】
したがって、脊椎の前側に例えば臓器等が位置する場合であつても、上記臓器等を回避して脊椎の椎体間へケージ本体３を挿入配置することができるものである。この際、ケージ本体３は後端側よりも先端側が薄く形成してあるので、椎体間へのケージ本体３の挿入を容易に行い得るものである。
【００１６】
上述のように、椎体間にケージ本体３を挿入配置した後は、上下両面に備えた抜け止め防止用の複数の爪状部１９における稜線１７が上下の椎体の終板に喰い込む態様となり、椎体間からの抜け止め効果が得られるものである。また、ケージ本体３の後端面に形成したＶ字形状の溝部１３からスクリュー貫通孔１５Ｕ，１５Ｌを貫通して上下の椎体にインプラントスクリューＳを螺入することにより、上下の椎体間にケージ本体３を確実に固定することができるものである。この際、スクリュー貫通孔１５Ｕ，１５Ｌが長孔であることにより、椎体の状態に対応してインプラントスクリューＳの螺入位置を左右にずらすことができるものである。
【００１７】
前述のごとく上下の椎体間にケージ本体３を固定した後、上下面に形成した前側上下孔５，中央部上下孔７及び後側上下孔９に骨が成長して次第に入り込む態様となり、骨癒合を促進できるものである。そして、前記各上下孔５，７，９に対応して設けた横貫通孔５Ａ，７Ａ，９Ａを透過してＸ線撮影を行うことにより、前記骨癒合の判定を行うことができるものである。
【００１８】
【発明の効果】
以上のごとき説明より理解されるように、ケージ本体は全体が一体物であって、構成が簡単になるものである。また先端側の一方の角部の角度をほぼ二等分する二等分線に対してほぼ直交する方向の稜線を備えた抜け止め防止用の複数の爪状部が上下両面に適宜間隔に設けられているので、脊椎の斜め前方から椎体間に挿入配置することができると共に、挿入配置後は抜け止めを効果的に行うことができるものであって、前述したごとき従来の問題を解消し得るものである。
【図面の簡単な説明】
【図１】本発明の実施形態に係る椎間ケージの斜視説明図である。
【図２】本発明の実施形態に係る椎間ケージの平面説明図である。
【図３】本発明の実施形態に係る椎間ケージの側断面説明図である。
【図４】本発明の実施形態に係る椎間ケージの後面説明図である。
【図５】従来の椎間ケージの斜視説明図である。
【図６】従来の椎間ケージの使用状態を示す説明図である。
【符号の説明】
１　椎間ケージ
３　ケージ本体
３Ｆ　前面
３Ｃ　一方の角部
５　前側上下孔
７　中央上下孔
９　後側上下孔
１１　穴
１３　溝部
１５Ｕ，１５Ｌ　スクリュー貫通孔
１７　稜線
１９　爪状部

Claims (2)

  1. 脊椎の椎体間に挿入配置される椎間ケージであって、中空状のゲージ本体の先端側の厚さよりも後端側の厚さを厚く設け、前記先端側の一方の角部の角度をほぼ二等分する二等分線に対してほぼ直交する方向に稜線を形成した複数の抜け止め防止用の爪状部を上下両面に備え、かつ後端面に形成したＶ字形状の溝部に、斜め上下方向のスクリュー貫通孔を形成したことを特徴とする椎間ケージ。
  2. 請求項１に記載の椎間ケージにおいて、スクリュー貫通孔は左右方向の長孔であることを特徴とする椎間ケージ。
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US10/642,684 US7135043B2 (en) 2002-08-20 2003-08-19 Intervertebral cage
KR1020030057307A KR20040017780A (ko) 2002-08-20 2003-08-19 추간 케이지
DE60321432T DE60321432D1 (de) 2002-08-20 2003-08-20 Zwischenwirbelkäfig
EP03018957A EP1391189B1 (en) 2002-08-20 2003-08-20 Intervertebral cage
KR1020060047144A KR100747678B1 (ko) 2002-08-20 2006-05-25 추간 케이지

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US20040172130A1 (en) 2004-09-02
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JP4088495B2 (ja) 2008-05-21
DE60321432D1 (de) 2008-07-17
US7135043B2 (en) 2006-11-14
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KR20040017780A (ko) 2004-02-27

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