JP2004073547A - 椎間スペーサー - Google Patents

椎間スペーサー Download PDF

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JP2004073547A
JP2004073547A JP2002239086A JP2002239086A JP2004073547A JP 2004073547 A JP2004073547 A JP 2004073547A JP 2002239086 A JP2002239086 A JP 2002239086A JP 2002239086 A JP2002239086 A JP 2002239086A JP 2004073547 A JP2004073547 A JP 2004073547A
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Prior art keywords
vertebral bodies
intervertebral spacer
intervertebral
spacer
claw
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JP4164315B2 (ja
Inventor
Shigenaga Sato
佐藤 栄修
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 JP2002239086A priority Critical patent/JP4164315B2/ja
Priority to KR1020030057306A priority patent/KR100656976B1/ko
Priority to US10/642,756 priority patent/US7331996B2/en
Priority to EP03018956A priority patent/EP1391188A1/en
Publication of JP2004073547A publication Critical patent/JP2004073547A/ja
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/44Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/4455Joints 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
    • A61F2/447Joints 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/44Joints for the spine, e.g. vertebrae, spinal discs
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/44Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/442Intervertebral or spinal discs, e.g. resilient
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/44Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/4455Joints 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/46Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603Special 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
    • A61F2/4611Special 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30904Special 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/44Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2002/448Joints 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

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  • 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)

Abstract

【課題】椎間板を除去した後の椎体間への挿入が容易で抜け難く、かつ椎体との接触性の良好な椎間スペーサーを提供する。
【解決手段】脊椎の椎体間に挿入配置される椎間スペーサーにおいて、当該椎間スペーサー1の上下両面5,7を、前後方向の中間部分が頂部13をなす曲面21A,21Bに形成してあり、前記上下両面5,7に、複数の抜け止め防止用の爪状部17を備えた構成であって、先端側が先細の曲面に形成してある。
【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スペーサーにおいて、当該椎間スペーサーの上下両面を、前後方向の中間部分が頂部をなす曲面に形成してあるものである。
【0007】
請求項2に係る発明は、請求項1に記載の椎間スペーサーにおいて、前記上下両面に、複数の抜け止め防止用の爪状部を備えた構成である。
【0008】
請求項3に係る発明は、請求項1又は2に記載の椎間スペーサーにおいて、先端側が先細の曲面に形成してあるものである。
【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23A,23B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 (3)

  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、当該椎間スペーサーの上下両面を、前後方向の中間部分が頂部をなす曲面に形成してあることを特徴とする椎間スペーサー。
  2. 請求項1に記載の椎間スペーサーにおいて、前記上下両面に、複数の抜け止め防止用の爪状部を備えたことを特徴とする椎間スペーサー。
  3. 請求項1又は2に記載の椎間スペーサーにおいて、先端側が先細の曲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
KR1020030057306A KR100656976B1 (ko) 2002-08-20 2003-08-19 추간 스페이서
US10/642,756 US7331996B2 (en) 2002-08-20 2003-08-19 Intervertebral spacer
EP03018956A EP1391188A1 (en) 2002-08-20 2003-08-20 Intervertebral spacer

Applications Claiming Priority (1)

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)

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

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Country Status (4)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012008279A1 (ja) * 2010-07-14 2012-01-19 ナカシマメディカル株式会社 椎間ケージ
KR101817600B1 (ko) * 2016-03-10 2018-01-11 주식회사 코렌텍 Tlif 케이지

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* Cited by examiner, † Cited by third party
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FR2767675B1 (fr) * 1997-08-26 1999-12-03 Materiel Orthopedique En Abreg Implant intersomatique et ancillaire de preparation adapte pour permettre sa pose
US7169183B2 (en) * 2000-03-14 2007-01-30 Warsaw Orthopedic, Inc. Vertebral implant for promoting arthrodesis of the spine
AR036713A1 (es) * 2002-10-02 2004-09-29 Carrasco Mauricio Rodolfo Implante para corregir una deformidad de la columna vertebral.
US7125425B2 (en) * 2002-10-21 2006-10-24 Sdgi Holdings, Inc. Systems and techniques for restoring and maintaining intervertebral anatomy
US7063725B2 (en) * 2002-10-21 2006-06-20 Sdgi Holdings, Inc. Systems and techniques for restoring and maintaining intervertebral anatomy
US7828849B2 (en) 2003-02-03 2010-11-09 Warsaw Orthopedic, Inc. Expanding interbody implant and articulating inserter and method
WO2004084742A1 (en) 2003-03-24 2004-10-07 Theken Surgical Llc Spinal implant adjustment device
US7326251B2 (en) * 2003-04-01 2008-02-05 Sdgi Holdings, Inc. Interbody fusion device
FR2858546B1 (fr) * 2003-08-04 2006-04-28 Spine Next Sa Prothese de disque intervertebral
DK1713421T3 (da) * 2004-02-13 2011-03-21 Franz Jun Copf Intervertebralt implantat til spondylodese af lænderyghvirvelsøjlen
US20050242101A1 (en) * 2004-04-29 2005-11-03 Skalitzky Michael J Seal-coated plastic container for dispensing a pressurized product
US20060095136A1 (en) * 2004-11-03 2006-05-04 Mcluen Design, Inc. Bone fusion device
US8597360B2 (en) 2004-11-03 2013-12-03 Neuropro Technologies, Inc. Bone fusion device
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