JP4164315B2 - 椎間スペーサー - Google Patents

椎間スペーサー Download PDF

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Publication number
JP4164315B2
JP4164315B2 JP2002239086A JP2002239086A JP4164315B2 JP 4164315 B2 JP4164315 B2 JP 4164315B2 JP 2002239086 A JP2002239086 A JP 2002239086A JP 2002239086 A JP2002239086 A JP 2002239086A JP 4164315 B2 JP4164315 B2 JP 4164315B2
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end side
rear end
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vertebral bodies
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JP2004073547A (ja
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栄修 佐藤
一弥 織部
洋 高御堂
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昭和医科工業株式会社
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Priority to JP2002239086A priority Critical patent/JP4164315B2/ja
Priority to US10/642,756 priority patent/US7331996B2/en
Priority to KR1020030057306A priority patent/KR100656976B1/ko
Priority to EP03018956A priority patent/EP1391188A1/en
Publication of JP2004073547A publication Critical patent/JP2004073547A/ja
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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2/4611—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of spinal prostheses
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30904—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves serrated profile, i.e. saw-toothed
    • 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
    • A61F2002/448—Joints for the spine, e.g. vertebrae, spinal discs comprising multiple adjacent spinal implants within the same intervertebral space or within the same vertebra, e.g. comprising two adjacent spinal implants

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Neurology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Cardiology (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)
  • Surgical Instruments (AREA)

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に、椎体の間に挿入配置される椎間スペーサーに係り、さらに詳細には、椎間への挿入が容易であり、かつ椎体の終板とほぼ全面的に接触し得る椎間スペーサーに関する。
【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］
特開２００２−９５６８５号公報
上記特許文献１に係る椎間スペーサー１００は、図３（Ａ）に示すように、後端側１０１よりも先端側１０３の方が厚くなるように形成してあり、傾斜した上下の面１０５Ｕ，１０５Ｌは平面に形成してある。そして、上下の傾斜平面１０５Ｕ，１０５Ｌには、錐体形状の複数の突起物１０７が設けられている。
【０００４】
上記構成の椎間スペーサー１００は、図３（Ｂ），（Ｃ）に示すように、椎間板を除去した後の椎体１０９Ａ，１０９Ｂの間に後方から挿入配置されるものである。
【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、上下両面に突起物１０７を備えたことにより、抜け止め効果が向上するものの、後端側１０１よりも先端側１０３が厚肉であることにより、上下の椎体１０９Ａ，１０９Ｂの間に挿入するとき、挿入が容易でないと共に、上下の面１０５Ｕ，１０５Ｌが傾斜した平面に形成してあることにより、上下の椎体１０９Ａ，１０９Ｂの終板と上記傾斜平面１０５Ｕ，１０５Ｌとが全体的に面接触することがなく、接触面積が少ないので浮きを生じ易く、ぐらつき等の不安定性が残るという問題がある。
【０００６】
【課題を解決するための手段】
本発明は前述のごとき問題に鑑みてなされたもので、脊椎の椎体間に挿入配置される椎間スペーサーにおいて、スペーサー本体（３）の先端側の間隔よりも後端側の間隔が狭くなるように傾斜した仮想の傾斜面又は互いに平行な仮想の平面（１９Ａ，１９Ｂ）に沿って上下両面（５，７）の全面に抜け止め防止用の複数の爪状部（１７）の基部側を配置して備え、各爪状部（１７）の頂角の部分は前後の中間部に頂部が位置する凸形の弧状の曲面（２１Ａ，２１Ｂ）に沿って配置した構成であって、前記仮想の傾斜面又は仮想の平面（１９Ａ，１９Ｂ）と前記曲面（２１Ａ，２１Ｂ）とが先端側で交差した付近から突出した先端部（９）を、最先端部側が次第に小さくなる球面状の先細の曲面に形成して設け、前記仮想の傾斜面又は仮想の平面（１９Ａ，１９Ｂ）と前記曲面（２１Ａ，２１Ｂ）とが後端側で交差した付近を後端面に形成してあることを特徴とするものである。
【０００９】
【発明の実施の形態】
以下、図面を用いて本発明の実施の形態について説明するに、前述した従来の構成と同一機能を奏する構成部分には同一符号を付して説明することとする。
【００１０】
図１を参照するに、本発明の第１の実施形態に係る椎間スペーサー１は、椎間板を除去した後の椎体の間に挿入配置して使用されるもので、スペーサー本体３の上面５及び下面７は、先端部９と後端部１１との間の中間部分に頂部１３が位置するように凸形の弧状に湾曲してある。
【００１１】
より詳細には、前記スペーサー本体３の前記先端部９は、例えば球面等のごとく最先端部側が次第に小さくなるように先細の曲面に形成してあり、後端部１１には、椎間板を除去した後の椎体の間へスペーサー本体３を挿入する際に使用する例えば鉗子等のごとき適宜の工具が係合する工具係合部１５が形成してある。
【００１２】
そして、前記スペーサー本体３の上面５及び下面７には、複数の抜け止め防止用の爪状部（抜け止め防止部）１７が形成してある。上記抜け止め防止部（爪状部）１７は、断面形状は三角形状を呈するものであって、その形状は、椎間板を除去した後の椎体間に先端部９から挿入するときには容易に挿入でき、引き抜く際には抜け難いように、挿入方向の傾斜角は小さく引き抜く方向の傾斜角は大きな三角形状に形成してある。
【００１３】
前記スペーサー本体３は、先端側の間隔よりも後端側の間隔が狭くなるように傾斜した仮想の傾斜面１９Ａ，１９Ｂに沿って上下両面５，７の前記爪状部１７の基部側を配置し、前記爪状部１７の稜（頂角の部分）は、前後の中間部に頂部が位置する凸形の弧状の曲面２１Ａ，２１Ｂに沿って配置した構成であって、前記傾斜面１９Ａ，１９Ｂと曲面２１Ａ，２１Ｂとが先端側で交差した付近から先細の曲面を呈する前記先端部９が突出した態様であり、後端側で前記傾斜面１９Ａ，１９Ｂと曲面２１Ａ，２１Ｂとが交差した付近が後端面に形成してある。
【００１４】
前記構成において、前述した従来技術と同様に、椎間板を除去した後の椎体の間に後側から、スペーサー本体３の先端部９を挿入するとき、上記先端部９は先細の曲面に形成してあるので、また前記スペーサー本体３の上下両面５，７に形成した爪状部１７は挿入し易く引き抜き難い形状に形成してあるから、前記椎体間へのスペーサー本体３の挿入を容易に行うことができる。
【００１５】
そして、挿入後においては、スペーサー本体３を間にした上下の椎体はインプラント等（図示省略）によって互いに動かないように固定されるものである。この際、スペーサー本体３における上下の複数の爪状部１７は上下の椎体に喰い込む態様となり抜け止め効果を奏すると共に、前記複数の爪状部１７の稜は、頂部が前後の中間部に位置する凸形の弧状の曲面２１Ａ，２１Ｂに沿って形成してあるので、上下の椎体の終板とほぼ全体的に面接触することとなり、ぐらつき等の不安定性を解消することができ、前述したごとき従来の問題を解消し得るものである。
【００１６】
図２は本発明の第２の実施形態を示すもので、前述した第１の実施の形態に示した構成部分と同一機能を奏する部分には同一符号を付することとして重複した説明は省略する。
【００１７】
この第２の実施の形態において、前記第１の実施の形態と相違する部分は、仮想の前記傾斜面１９Ａ，１９Ｂを互いに平行な平面に形成した点であり、その他の構成は前述と同様である。
【００１８】
この第２の実施形態においても、前述した第１の実施形態と同様の効果を奏し得るものである。
【００１９】
【発明の効果】
以上のごとき説明より理解されるように、本発明によれば、椎間板を除去した後の椎体の間にスペーサー本体を挿入配置するとき、挿入が容易であると共に、挿入後に抜け難いものであり、かつ挿入後においては上下の椎体とほぼ全体的に面接触し、ぐらつき等の不安定性を解消することができ、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】本発明の第１の実施形態に係る椎間スペーサーの説明図である。
【図２】本発明の第２の実施形態に係る椎間スペーサーの説明図である。
【図３】従来の椎間スペーサーおよびその使用状態を示す説明図である。
【符号の説明】
１ 椎間スペーサー
３ スペーサー本体
５ 上面
７ 下面
９ 先端部
１１ 後端部
１３ 頂部
１５ 工具係合部
１７ 爪状部（抜け止め防止部）
１９Ａ，１９Ｂ 傾斜面
２１Ａ，２１Ｂ 曲面

Claims (1)

  1. 脊椎の椎体間に挿入配置される椎間スペーサーにおいて、スペーサー本体（３）の先端側の間隔よりも後端側の間隔が狭くなるように傾斜した仮想の傾斜面又は互いに平行な仮想の平面（１９Ａ，１９Ｂ）に沿って上下両面（５，７）の全面に抜け止め防止用の複数の爪状部（１７）の基部側を配置して備え、各爪状部（１７）の頂角の部分は前後の中間部に頂部が位置する凸形の弧状の曲面（２１Ａ，２１Ｂ）に沿って配置した構成であって、前記仮想の傾斜面又は仮想の平面（１９Ａ，１９Ｂ）と前記曲面（２１Ａ，２１Ｂ）とが先端側で交差した付近から突出した先端部（９）を、最先端部側が次第に小さくなる球面状の先細の曲面に形成して設け、前記仮想の傾斜面又は仮想の平面（１９Ａ，１９Ｂ）と前記曲面（２１Ａ，２１Ｂ）とが後端側で交差した付近を後端面に形成してあることを特徴とする椎間スペーサー。
JP2002239086A 2002-08-20 2002-08-20 椎間スペーサー Expired - Lifetime JP4164315B2 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2002239086A JP4164315B2 (ja) 2002-08-20 2002-08-20 椎間スペーサー
US10/642,756 US7331996B2 (en) 2002-08-20 2003-08-19 Intervertebral spacer
KR1020030057306A KR100656976B1 (ko) 2002-08-20 2003-08-19 추간 스페이서
EP03018956A EP1391188A1 (en) 2002-08-20 2003-08-20 Intervertebral spacer

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Application Number Priority Date Filing Date Title
JP2002239086A JP4164315B2 (ja) 2002-08-20 2002-08-20 椎間スペーサー

Publications (2)

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JP2004073547A JP2004073547A (ja) 2004-03-11
JP4164315B2 true JP4164315B2 (ja) 2008-10-15

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US (1) US7331996B2 (ja)
EP (1) EP1391188A1 (ja)
JP (1) JP4164315B2 (ja)
KR (1) KR100656976B1 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012019919A (ja) * 2010-07-14 2012-02-02 Nakashima Medical Co Ltd 椎間ケージ
US9707320B2 (en) 2010-11-10 2017-07-18 Mitsubishi Materials Corporation Porous implant material
US9707321B2 (en) 2010-11-10 2017-07-18 Mitsubishi Materials Corporation Porous implant material

Families Citing this family (58)

* Cited by examiner, † Cited by third party
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US20040102847A1 (en) 2004-05-27
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EP1391188A1 (en) 2004-02-25
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