JP2003503154A - 椎間インプラント - Google Patents

椎間インプラント

Info

Publication number
JP2003503154A
JP2003503154A JP2001507397A JP2001507397A JP2003503154A JP 2003503154 A JP2003503154 A JP 2003503154A JP 2001507397 A JP2001507397 A JP 2001507397A JP 2001507397 A JP2001507397 A JP 2001507397A JP 2003503154 A JP2003503154 A JP 2003503154A
Authority
JP
Japan
Prior art keywords
implant according
implant
recess
pivot
central
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
JP2001507397A
Other languages
English (en)
Other versions
JP4192262B2 (ja
JP2003503154A5 (ja
Inventor
ティエリー マルナイ
ボリス ベイエアスドルフ
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.)
DePuy Spine LLC
Original Assignee
Spine Solutions Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26062622&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=JP2003503154(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Spine Solutions Inc filed Critical Spine Solutions Inc
Publication of JP2003503154A publication Critical patent/JP2003503154A/ja
Publication of JP2003503154A5 publication Critical patent/JP2003503154A5/ja
Application granted granted Critical
Publication of JP4192262B2 publication Critical patent/JP4192262B2/ja
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • A61F2/4425Intervertebral or spinal discs, e.g. resilient made of articulated components
    • AHUMAN NECESSITIES
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    • 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
    • A61F2/30721Accessories
    • A61F2/30749Fixation appliances for connecting prostheses to the body
    • 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
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    • A61F2/30767Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • AHUMAN NECESSITIES
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    • 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
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    • AHUMAN NECESSITIES
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    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/02Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors
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    • AHUMAN NECESSITIES
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    • 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
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    • 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
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    • A61F2002/30131Rounded shapes, e.g. with rounded corners horseshoe- or crescent- or C-shaped or U-shaped
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    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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    • A61F2002/3011Cross-sections or two-dimensional shapes
    • A61F2002/30138Convex polygonal shapes
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    • 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
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The 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
    • A61F2002/30317The prosthesis having different structural features at different locations within the same prosthesis
    • A61F2002/30324The prosthesis having different structural features at different locations within the same prosthesis differing in thickness
    • 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
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    • A61F2002/30316The 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
    • A61F2002/30329Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
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    • A61F2002/30329Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30383Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
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    • 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
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    • 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
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    • 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
    • A61F2002/3093Special external or bone-contacting surface, e.g. coating for improving bone ingrowth for promoting ingrowth of bone tissue
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    • 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
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    • AHUMAN NECESSITIES
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    • A61F2220/0025Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • AHUMAN NECESSITIES
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    • A61F2230/0004Rounded shapes, e.g. with rounded corners
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    • AHUMAN NECESSITIES
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    • 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
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
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    • A61F2230/0017Angular shapes
    • AHUMAN NECESSITIES
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    • 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
    • A61F2250/00Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0036Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in thickness
    • 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
    • A61F2310/00Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005The prosthesis being constructed from a particular material
    • A61F2310/00011Metals or alloys
    • A61F2310/00023Titanium or titanium-based alloys, e.g. Ti-Ni alloys

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Abstract

(57)【要約】 本発明は、椎体用の支持面(5)を有する上部(2)と、隣接する椎体用の支持面(13)を有する下部(3)とを含む椎間インプラント(1)に関する。接触エレメント(20、21、22、23)が、前記上部及び下部に配置されており、操作器具によってインプラントの一方の側からそれぞれアクセスされ得る。本発明の目的は、椎間空間内へ挿入するための椎間インプラント(1)の構造高さを最低限にすることである。この目的のために、相手方の部分に向けられているとともに、上部(2)が下部(3)に近づくと相互に係合するように相互に横方向にずらされた、突出部(10)及び凹部(19)と、突出部(16、17)及び凹部(9)とを、各上部(2)及び下部(3)はそれぞれ備えている。接触エレメント(20、21)は上部(2)の突出部(10)内に、接触エレメント(22、23)は下部(3)の突出部(16、17)内に、それぞれ配置されているとともに、上部(2)の接触エレメント(22、23)と下部(3)の接触エレメント(20、21)とは、相互に隣接して位置しかつ椎間インプラント(1)の高さ方向に少なくとも部分的に重なっている。

Description

【発明の詳細な説明】
【0001】 (発明の属する技術分野) 本発明は、椎骨用の支持面を有する上部と、隣接する椎骨用の支持面を有する
下部とを備える椎間インプラントに関し、各部の上には、椎間インプラントの一
方の側から操作器具をアクセス可能な係合エレメントが、椎間空間内へ挿入した
時の椎間インプラントの構造高さを最低限とするように配置されている。
【0002】 (発明の背景) このような椎間インプラントの一つが、例えば、米国特許第5,314,47
7号明細書により公知である。この椎間インプラントは、椎間空間から取り出さ
れる椎間板の代わりに使用されるものであって、椎骨間の間隙内に嵌合させる必
要があることから、それに応じて、椎間インプラントの構造高さは、相対的に低
くなければならない。米国特許第5,314,477号明細書の公知の椎間イン
プラントにおける例のように、上部と下部との間に追加のピボット挿入部も埋め
込まれる場合、このことは、特に難しい。
【0003】 2つの部分からなる椎間インプラントにおいてさえ、特に、インプラントが、
椎間インプラントを骨内に固定することを目的としたピン及び他の突出部も支持
面上に有している場合に、困難が生じる。これらの部分は、椎間空間をかなり広
げなければ挿入することができない場合が多い。これは、困難であるだけでなく
、損傷の危険もある。
【0004】 椎間空間の高さは、相対的に低いことから、操作器具を、椎間インプラントの
両方の部分に固定されるように係合エレメントに係合させることも難しい。従来
においては、例えば、上部及び下部上の孔にピンを挿入することにより、上部及
び下部と別々に係合する操作器具を有しており、その結果、該操作器具により、
椎間空間内に椎間インプラントの2つの部分を挿入でき、かつ、選択的に、相互
の間隔を変更することもできるので、これによって、椎間空間をある程度押し広
げることができる。この点については、米国特許第5,314,477号明細書
のペンチ状の操作器具を参照されたい。
【0005】 強い力がかかるため、例えば、受け取り孔は、一定の直径でなければならない
など、係合エレメントにある程度の構造高さを持たせる必要がある。このために
、上部及び下部に最低限の構造高さが必要となるが、従来の椎間インプラントに
おいては、上部及び下部の構造高さが、合計され、その結果、上部及び下部が直
接支持し合っている場合でさえ、椎間インプラントの構造高さが比較的大きくな
ってしまうことは、なお避けがたい。
【0006】 (発明の概要) 本発明の目的は、一般的なこの種の椎間インプラントを最低限の高さを低減す
るようなものとし、椎間空間内への椎間インプラントの挿入をより容易にするこ
とである。
【0007】 最初に説明した種類の椎間インプラントにおいて、本発明によれば、上部及び
下部が、相手方の部分にそれぞれ向けられた突出部及び凹所を備え、該突出部及
び凹所は、上部が下部に接近すると相互に噛み合うように横方向に相互にずらさ
れていること、及び、上部の係合エレメント及び下部の係合エレメントが、並行
して配置されるとともに椎間インプラントの高さ方向に少なくとも部分的に重な
るように、上部上の係合エレメント及び下部上の係合エレメントが、これらの部
分の突出部内にそれぞれ配置されることが提案され、これによりこの目的は達成
される。
【0008】 このような実施形態において、係合エレメントは、最低限の構造高さより低く
なることはなく、上部及び下部の突出部内にすなわち上部及び下部の構造高さが
最も高い部分内にそれぞれ配置されることから、相互に載っている2つの椎間イ
ンプラント部分の最低限の構造高さが、達成される。構造高さが高いこれらの領
域は、突出部として設けられており、該突出部に各凹所が隣接し、該凹所内に、
相手方の各部分の突出部を嵌入させることができる。その結果、操作器具用の係
合エレメントは、一方で並行して配置されるとともに他方で少なくとも部分的に
重なり、結果として、椎間インプラントの相互に載っている部分の全構造高さを
、従来の椎間インプラントに比較して著しく低減させることができる。よって、
利用可能な材料の高さを最大限活用することを伴った、上部及び下部の当該配置
に帰着する。
【0009】 係合エレメントは、操作器具のピン状保持エレメント用の挿入開口部であると
のが望ましい。説明した構造によって、この挿入開口部は、比較的大きな直径と
することができることから頑丈な保持ピンを受け取ることができるが、それにも
拘わらず、椎間インプラント部分が相互に直接載っている構造高さは、比較的低
くなる。
【0010】 挿入開口部は、支持面に実質的に平行に延びていると望ましく、もう一度繰り
返すが、これにより、椎間インプラント部分の構造高さが増すことを防止できる
【0011】 好ましい実施形態において、下部は、下側支持面と反対側に中央凹部を備え、
該凹部は、U字状の側縁により取り囲まれている。従って、下部及び上部が相互
に直接載ると、凹部は、上部上の突出部を受け取ることに役立つ。
【0012】 実質上相補的方法で凹部内へはまる中央突出部を上部が有している、すなわち
、凹部の総体積が突出部のために利用されるのが望ましい。
【0013】 下部の係合エレメントは、U字状側縁の2つの端部に配置される、換言すれば
、外側に配置されるのが望ましい。
【0014】 逆に、上部の係合エレメントは、上部の中央突出部上に配置可能であり、換言
すれば、上部の係合エレメントよりさらに内側に配置される。
【0015】 特に、上部の係合エレメントは、中央突出部の短辺側の側縁の近くに配置可能
であるので、上部についても同様に、係合エレメントの間隔は、比較的大きくな
るように選択可能である。その結果、確実に、上部及び下部が斜めにならないよ
うにできる。
【0016】 本明細書においてすでに述べられているが、「下部」及び「上部」という用語
は、椎間インプラントが組み込まれる脊柱内の位置について必ずしも言っている
訳ではなく、「下部」と呼ばれる部分は、実際には、脊柱内の上方にある可能性
がある。非常に重要なことは、単に、上部及び下部が、椎間インプラントの向き
合った側においてインプラントを画定しているということである。
【0017】 上部及び/または下部は、実質的にプレート状であるのが特に望ましく、これ
らの部分は、当然、本発明の設計に従い、各相手方の部分に向けられている突出
部及び凹所を有している。しかしながら、プレート状であることは、全体として
、椎間インプラントの構造高さを非常に低減させることになる。
【0018】 好ましい実施形態において、各下部及び上部は、ピボット挿入部用の各受入れ
部を有している。このピボット挿入部は、椎間インプラントを挿入した後上部及
び下部との間に配置されて、上部及び下部を相互に支持するものであって、弾力
機能を有することから、例えば、さらに、椎間インプラントの2つの部分を相互
にある程度回動可能とし、その結果、同様に隣接する椎骨を回動可能とすること
ができる。
【0019】 特に、ピボット挿入部は、少なくとも1つの球状支持面を備え、該球状支持面
は、対応の球状受入れ部と係合するのが望ましい。
【0020】 球状受入れ部は、上部の中央突出部内に配置されるのが望ましい。
【0021】 また、下部の中央凹部は、ピボット挿入部用の受入れ部を形成するのが望まし
い。
【0022】 本発明の好ましい実施形態によれば、ピボット挿入部は、操作器具用の係合エ
レメントを備えている側から受入れ部内に差込可能とされる。これは、上部及び
下部が椎間空間内へ差し込まれる側のことであり、すでに挿入されている椎間イ
ンプラント部分の間にピボット挿入部を押し込むことができるのは、この側から
である。
【0023】 ピボット挿入部は、ガイドに沿って受入れ部内へ挿入可能であるのが望ましい
【0024】 挿入部も同様に、実質的にプレート状とされることが好ましい。
【0025】 挿入部が、球状支持面を受入れ部から突出させて実質的に完全に中央受入れ部
を埋めると、特に望ましい設計が得られる。
【0026】 本発明の好ましい実施形態についての後に続く説明は、図面に関連してさらな
る説明を提供する。
【0027】 (好ましい実施形態) 図面に示した椎間インプラント1は、3つの部分、すなわち、プレート状の上
部2、プレート状の下部3、及び実質的にプレート状のピボット挿入部4を含ん
でいる。
【0028】 上部2は、上面が平たくされ、これにより支持面5が形成され、該支持面5の
上には、支持面5上に載る椎骨内に上部2を固定する役割を果たす種々の突出部
6、7が、配置されている。固定状態において、上部2は、椎間空間へ端面を向
ける。
【0029】 上部2の断面は、実質的に長方形であり、図示した典型的な実施形態において
、長手方向に延びる側縁8が、外側へ湾曲している。
【0030】 プレート状上部2の長方形の2つの短い側部は、中央領域内より薄くなってお
り、この結果、上部2の短い側部に沿って、これらの側縁にそれぞれ平行に延び
外側に開口した下向きの凹所9が、形成されている。上部2の中央領域は、2つ
の凹所9の間に配置されていることから、より厚くまたはより高くなっており、
これに伴い、2つの凹所9の間に設けられる下向き突出部10を形成している。
この突出部は、下面11により画定されており、該下面11は、支持面5に実質
的に平行に延びており、その中には球状くぼみ部12が存在し、該球状くぼみ部
12は、ピボット挿入部4用のベアリングプレートを形成している。
【0031】 椎間インプラント1の下部3も、プレート状であり、その下側には、突出部1
4及び15を備えた平らな支持面13を有しており、突出部14及び15は、支
持面5の突出部6及び7に対応している。下部3は、支持面13から遠い側にお
いて外側領域より中央領域の方が薄い。このより厚い外側領域は、下部3の短い
側縁と平行に延びる2つの平行な脚部16及び17を有し、かつ、一方の端部に
2つの脚部16及び17を繋ぐ連結部18を有する、U字形であり、下部3の断
面は、上部2と同様にして形成されている。脚部16及び17と、連結部18と
により囲まれた領域は、中央凹部19を形成しており、この中央凹部19の領域
は、上部2の中央突出部10の領域と実質的に等しく、その一方で、脚部16及
び17の配置及び長さは、基本的に、上部2上の凹所9の配置及び長さと対応し
ている。その結果、上部2の中央突出部10が、中央凹部19内へ嵌入し、その
一方で、下部3の脚部16及び17が、上部2の凹所9内へ嵌入するように、上
部2及び下部3を相互に配置することができる(図4)。この配置において、上
部2及び下部3は、相互に最大限接近して、最低限の構造高さとなっている。
【0032】 突出部が嵌入することにより、種々の凹所が基本的に完全に埋められるような
寸法が、選択される。
【0033】 奥端が閉じた閉じ穴20及び21は、下部3の2つの脚部16及び17内に加
工され、自由端からこれらの脚部16及び17と平行に延び、これらの穴の直径
は、脚部16及び17の高さに比例して大きくなり、この直径は、実際、下部3
の中央凹部19領域の厚さまたは高さより大きい。
【0034】 閉じ穴22及び23は、下部3内の閉じ穴20及び21と平行に延びており、
上部2の中央突出部10側縁付近においてその中に加工されている。これらの閉
じ穴22及び23は、比較的大きな直径であって、この直径は、突出部10の高
さの実質的部分に対応しているとともに、上部2の凹所9領域の厚さより大きく
なっている。
【0035】 上部2及び下部3が、説明した方法で相互に固く押し当てられると、図4及び
図5にはっきり示されているように、下部3の閉じ穴20及び21と、上部2の
閉じ穴22及び23とは、椎間インプラント1の高さ方向に少なくとも部分的に
重なる。
【0036】 閉じ穴20、21、22及び23は、図面には示していないが、操作器具のピ
ン状延長部用の受入れ部として機能することから、この操作器具用の係合エレメ
ントを形成しており、該操作器具は、このように、別々に、上部2及び下部3と
係合する。この操作器具によって、椎間インプラント1の上部2及び下部3を椎
間空間内へ差し込むことができる。そして、椎間インプラント1の構造高さが非
常に低いため、この差し込みが容易となり、該差し込みは、基本的に、椎間空間
を大幅に広げずに行うことができる。
【0037】 上部2及び下部3をこのように差し込んだ後に、椎間インプラント1の2つの
部分は、広げて離すことができる。すなわち、例えば、上部2及び下部3を保持
している操作器具の助けを借りて、これらの間隔は広げられる。
【0038】 上部2及び下部3が広がり開口した位置において、上部2と下部3との間にピ
ボット挿入部4を押し込むことができる。
【0039】 このピボット挿入部は、基本的にプレート状に構成されており、平らな下面2
4と球状に上向きに湾曲した上面25とを有している。プレート状のピボット挿
入部の外側寸法は、下部3の中央凹部19の外側寸法と同じであり、その結果、
ピボット挿入部4を、この凹部内へ押し込み、特に閉じ穴20、21、22、2
3が開口している側から挿入していくことができる。ピボット挿入部4の側縁上
のガイドストリップ26は、脚部16及び17内の対応するガイド溝27に係合
し、その結果、下部3内にピボット挿入部4を挿入した後固定するための挿入ガ
イド部が、形成される。挿入されたピボット挿入部4は、挿入後に、凹部19を
埋めるとともに、下部3の上面から上向きに、球状に湾曲した上面25を突出さ
せる。球状上面25は、突出部10の下側上の球状に湾曲したくぼみ部12内に
相補的に嵌入し、そしてそこで、上部2とともにボールジョイントを形成し、該
ボールジョイントにより、下部3に対して上部2がある程度回動可能となる(図
7)。
【0040】 ピボット挿入部4の平らな下面24には、戻り止め突出部28を備えることが
できる。ピボット挿入部4が、下部3内へ挿入されると、この突出部は、凹部1
9の底部上に配置された戻り止め凹所29内に弾力的にはまり込む。その結果、
ピボット挿入部4も、凹部19内に挿入方向に固定される。
【0041】 上部2及び下部3は、チタンのような生理学的に安全な金属からなることが好
ましく、一方で、ピボット挿入部4は、同様に、ポリエチレンのような生理学的
に安全なプラスチック材料を備えていることが好ましい。これらの支持面5及び
支持面13は、特別に骨との適合性を持たせることができ、例えば、この面は、
コーティングにより粗面とすることができるので、隣接する骨材料への最適な固
定が得られる。
【図面の簡単な説明】
【図1】 上部、下部、及びそれらの間に挿入可能なピボット挿入部を備えた椎間インプ
ラントの拡大斜視図である。
【図2】 ピボット挿入部が挿入されていない、椎間インプラントの上部及び下部の拡大
斜視図である。
【図3】 ピボット挿入部が下部内に挿入されている図2と同様の図である。
【図4】 相互に最大限接近している椎間インプラントの上部及び下部の斜視図である。
【図5】 図4の椎間インプラントの正面図である。
【図6】 ピボット挿入部が挿入された椎間インプラントの斜視図である。
【図7】 図6の椎間インプラントの断面図である。
───────────────────────────────────────────────────── フロントページの続き (72)発明者 マルナイ ティエリー フランス国 エフ−34080 モンペリエー ル アベニュー ヴァレリー ラルボー 290 (72)発明者 ベイエアスドルフ ボリス ドイツ国 デー−78532 トゥトリンゲン メーリンガーシュトラーセ 5 Fターム(参考) 4C060 LL13 LL20 MM24 4C097 AA10 BB01 BB09 CC01 CC04 DD10 EE02 SC10 【要約の続き】 の高さ方向に少なくとも部分的に重なっている。

Claims (17)

    【特許請求の範囲】
  1. 【請求項1】 椎骨用の支持面(5)を有する上部(2)と、隣接する椎骨
    用の支持面(13)を有する下部(3)とを備え、各部分上には、前記椎間イン
    プラントの一方の側から操作器具をアクセス可能な係合エレメント(20、21
    、22、23)が配置されている、椎間インプラント(1)であって、 各前記上部(2)及び下部(3)は、各々相手方の部分に向けられた、突出部
    (10)及び凹所(19)と、突出部(16、17)及び凹所(9)とを備え、
    前記突出部(10)及び凹所(19)と、前記突出部(16、17)及び凹所(
    9)とは、前記上部(2)が前記下部(3)に接近すると相互に噛み合うように
    横方向に相互にずらされていること、及び、 前記上部(2)の各係合エレメント(22、23)及び前記下部(3)の各係
    合エレメント(20、21)は、前記上部(2)の係合エレメント(22、23
    )及び前記下部(3)の係合エレメント(20、21)が、並行して配置される
    とともに前記椎間インプラント(1)の高さ方向に少なくとも部分的に重なるよ
    うに、これらの部分の突出部(10、16及び17)内に配置されていること、
    を特徴とする椎間インプラント(1)。
  2. 【請求項2】 前記係合エレメント(20、21、22、23)は、操作器
    具のピン状保持エレメント用の挿入開口部であることを特徴とする請求項1に記
    載のインプラント。
  3. 【請求項3】 前記挿入開口部(20、21、22、23)は、前記支持面
    (5、13)に実質的に平行に延びていることを特徴とする請求項2に記載のイ
    ンプラント。
  4. 【請求項4】 前記下部(3)は、前記下方の支持面(13)と反対側に、
    中央凹部(19)を備えており、該凹部は、U字状側縁(16、17、18)に
    より囲まれていることを特徴とする請求項1から3のいずれかに記載のインプラ
    ント。
  5. 【請求項5】 前記上部(2)は、前記凹部(19)内に実質的に相補的に
    はめ込まれる中央突出部(10)を備えていることを特徴とする請求項4に記載
    のインプラント。
  6. 【請求項6】 前記下部(3)の係合エレメント(20、21)は、U字状
    側縁(16、17、18)の2つの端部に配置されていることを特徴とする請求
    項4または5のいずれかに記載のインプラント。
  7. 【請求項7】 前記上部(2)の係合エレメント(22、23)は、前記上
    部(2)の中央突出部(10)に配置されていることを特徴とする請求項5また
    は6に記載のインプラント。
  8. 【請求項8】 前記上部(2)の係合エレメント(22、23)は、前記中
    央突出部(10)の短辺側の側縁近くに配置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. 【請求項9】 前記上部(2)及び/または下部(3)は、実質的にプレー
    ト状とされていることを特徴とする請求項1から8のいずれかに記載のインプラ
    ント。
  10. 【請求項10】 前記各下部(3)及び上部(2)は、ピボット挿入部(4
    )用の各受入れ部(19、12)を有していることを特徴とする請求項1から9
    のいずれかに記載のインプラント。
  11. 【請求項11】 前記ピボット挿入部(4)は、少なくとも1つの球状支持
    面(25)を有しており、該球状支持面(25)は、対応する前記球状受入れ部
    (12)と係合することを特徴とする請求項10に記載のインプラント。
  12. 【請求項12】 前記球状受入れ部(12)は、前記上部(2)の中央突出
    部(10)内に配置されていることを特徴とする請求項11に記載のインプラン
    ト。
  13. 【請求項13】 前記下部(3)の中央凹部(19)は、前記ピボット挿入
    部(4)用受入れ部を形成していることを特徴とする請求項10から12のいず
    れかに記載のインプラント。
  14. 【請求項14】 前記ピボット挿入部(4)は、前記受入れ部(19)内に
    、前記操作器具用係合エレメント(20、21、22、23)を有する側から挿
    入可能であることを特徴とする請求項13に記載のインプラント。
  15. 【請求項15】 前記ピボット挿入部(4)は、ガイド(26、27)に沿
    い前記受入れ部(19)内に挿入可能であることを特徴とする請求項14に記載
    のインプラント。
  16. 【請求項16】 前記ピボット挿入部(4)は、実質的にプレート状とされ
    ていることを特徴とする請求項10から15のいずれかに記載のインプラント。
  17. 【請求項17】 前記ピボット挿入部(4)は、球状支持面(25)を前記
    中央受入れ部(19)から突出させて実質的に完全に前記受入れ部(19)を埋
    めていることを特徴とする請求項11から16のいずれかに記載のインプラント
JP2001507397A 1999-07-02 1999-07-02 椎間インプラント Expired - Fee Related JP4192262B2 (ja)

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DE29911422U DE29911422U1 (de) 1999-07-02 1999-07-02 Zwischenwirbelimplantat

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AT (1) ATE388677T1 (ja)
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BR (1) BR9917397A (ja)
CA (1) CA2391330C (ja)
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JP2010284540A (ja) * 2003-11-03 2010-12-24 Aesculap Implant Systems Inc 人工椎間板
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US8882839B2 (en) 2014-11-11
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US20130173005A1 (en) 2013-07-04
US6936071B1 (en) 2005-08-30

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