JP2008539830A - 人工椎間板 - Google Patents
人工椎間板 Download PDFInfo
- Publication number
- JP2008539830A JP2008539830A JP2008509278A JP2008509278A JP2008539830A JP 2008539830 A JP2008539830 A JP 2008539830A JP 2008509278 A JP2008509278 A JP 2008509278A JP 2008509278 A JP2008509278 A JP 2008509278A JP 2008539830 A JP2008539830 A JP 2008539830A
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- Prior art keywords
- lid
- cup
- intervertebral disc
- artificial intervertebral
- disc
- 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.)
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Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Neurology (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Heart & Thoracic Surgery (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)
Abstract
Description
協働する第1および第2の外殻を含み、第1区画を画定する外側ケースであって、この第1および第2の外殻が、互いに対して相対的に動くことができる外側ケースと、
カップおよび協働する蓋を含む内側ケースであって、このカップおよび蓋が互いに対して相対的に動くことができる、第2区画を画定する内側ケースと、
弾性の核とを備え、
a)内側ケースの蓋およびカップが、カップおよび蓋のうちの一方がカップおよび蓋のうちの他方の内側に受けられるようなサイズであり、
b)内側ケースが、実質的に、外側ケースの第1区画内に包含され、
c)弾性の核が、実質的に、内側ケースの第2区画内に包含され、カップおよび蓋を弾性的に分離するように、カップおよび蓋に対して核が付勢される。
上述のように、本発明の人工椎間板は様々な特徴を含み、ここでその特徴が要約される。まず、一態様では、椎間板が、軸回転、側方への屈曲、および屈曲/伸長を成分ベクトルに分離し、これらの動きに適応させるように、様々な構造的な構成要素を含む。結果として、椎間板は、概ね、このような個々の成分ベクトルに沿って、無傷の椎間板に関連する中立領域および弾性領域の動きを再現する。さらに、本発明は、過度の、または非生理的な動きを防ぐ設計された端点を利用する、無拘束の、および部分的に拘束された動きの組合せを許容する。完全に拘束された停止機構(すなわち「強固な停止」)は、動きが弾性領域を越えて伸長されないことを保証する。
上述のように、および図5に示されるように、上位環の湾曲した外面の回転軸は、好ましくは、人工椎間板の下に配置された隣接する椎骨本体に配置され、より好ましくは、椎骨本体の前方縁部の近くに配置される。このような配置は、無傷の正常な椎間板における生理的な軸を模倣している。結果として、たとえば、脊柱が後湾に向かおうとする傾向が防止され、その代わりに脊柱は前湾の向きを維持する。
上位外殻の側壁が、上位環をこの外殻の中に閉じ込める。さらに、下位環が上位環によって閉じ込められるという事実によって、上位外殻の任意の回転の動きが、環全体(すなわち上位および下位部分)ならびにその環の中に包含される弾性の核を押さえつけ、上位外殻と共に下位外殻に対して回転させることが理解されよう。
上記に示されたように、上位環が、下位環の上に装着するように構成され、それによって、下位環は、上位環の内部に入れ子になることができる。上位環および下位環の側壁同士の間に空間があることで、核の偏心した圧縮を伴う側方への屈曲(冠状面での屈曲)ができるようになる。中立領域は、脊柱を直立に保つように促す中立の脊柱配列に制限されたままであり、側湾姿勢を防止する。外殻上に側方に設けられた安定器が、所定量の側方への屈曲の後、強固な停止の働きをする。このような制限が、過度の側方への動作を防止することが理解されよう。
上述のように、屈曲の際に、人工椎間板の核は、上位外殻が上位環の湾曲の上を滑動するにつれて圧縮する。このような動きが、隣接する下位椎骨本体に対する回転軸を下げ、これによって、無傷の正常な椎間板における生理的関係を模倣する。このようにして、上位外殻の上位環の湾曲の上での動きと、屈曲によって誘導された核の圧縮との組合せの結果、強固な停止に達するまで、屈曲している正常な後方要素に徐々に荷重がかかる。上述のように、この組み合わさった動きが、強固な停止をもたらす後方外殻要素の摩耗を減少させる。
上位および下位環の前方および後方の端部に設けられた舌部および溝の構成が、安定をもたらし、弾性の核を並進の剪断に対して保護する。さらに、このような構成は、核の圧縮の程度における所定の限界(すなわち強固な停止)をもたらす。
Claims (18)
- 脊柱の隣接する第1の椎骨と第2の椎骨との間に埋入するための人工椎間板であって、
協働する第1および第2の外殻を含み、第1区画を画定する外側ケースであって、前記第1および第2の外殻が、互いに対して相対的に動くことができる外側ケースと、
カップおよび協働する蓋を含む内側ケースであって、前記カップおよび蓋が互いに対して相対的に動くことできる、第2区画を画定する内側ケースと、
弾性の核と、を備え、
a)前記内側ケースの前記蓋およびカップが、前記カップおよび蓋のうちの一方が前記カップおよび蓋のうちの他方の内側に受けられるようなサイズであり、
b)前記内側ケースが、実質的に、前記外側ケースの前記第1区画内に包含され、
c)前記弾性の核が、実質的に、前記内側ケースの前記第2区画内に包含され、前記カップおよび蓋を弾性的に分離するように、前記カップおよび蓋に対して前記核が付勢される人工椎間板。 - 前記外側ケースが、前記第1外殻と第2外殻との間の相対的な動きを制限する、1つまたは複数の第1制止手段を備えた請求項1に記載の人工椎間板。
- 前記内側ケースが、前記カップと蓋との間の相対的な動きを制限する、1つまたは複数の第2制止手段を備えた請求項2に記載の人工椎間板。
- 前記第1および第2の制止手段が、前記相対的な動きが設定点を越えるのを防止する止め子を含む請求項3に記載の人工椎間板。
- 前記外側ケースの前記第1外殻が、前記内側ケースの前記蓋の上に設けられ、前記第1外殻が、前記蓋の外面の上を滑動可能である請求項4に記載の人工椎間板。
- 前記蓋の前記外面が凸状部分を含み、前記第1外殻が、前記蓋の凸状部分を受ける協働する凹状部分を備えた内面を含む請求項5に記載の人工椎間板。
- 前記蓋の前記凸状部分が、矢状面を中心に湾曲している請求項6に記載の人工椎間板。
- 前記内側ケースの前記蓋およびカップが、概ね円形の形状である請求項7に記載の人工椎間板。
- 前記外側ケースの前記第1および第2の外殻が、凸状の外面を含む請求項8に記載の人工椎間板。
- 前記第1および第2の外殻が、冠状面および矢状面の両方の上で凸状になった請求項9に記載の人工椎間板。
- 前記第1および第2の外殻の前記外面が、概ね球状である請求項10に記載の人工椎間板。
- 前記第1および第2の外殻の前記外面の少なくとも一部が、物理的および/または化学的な骨成長促進部を備えた請求項11に記載の人工椎間板。
- 前記第1および第2の外殻の前記外面が、埋入されたときに前記外殻を隣接する椎骨構造体に固定する安定化部材を含む請求項8に記載の人工椎間板。
- 前記安定化部材が、骨固定ねじを受ける開口を含む請求項13に記載の人工椎間板。
- 前記椎間板が、前方、後方、および側方の端部を含み、前記外側ケースの前記第1および第2の外殻が、前記後方端部においてヒンジで係合された請求項1から14のいずれか一項に記載の人工椎間板。
- 前記外側ケースの前記第1または第2の外殻の一方が、各側方端部に第1舌部を含み、前記第1または第2の外殻の他方が、各側方端部に相補的な第1溝を含み、前記第1溝が、前記第1舌部を受けるように構成された請求項15に記載の人工椎間板。
- 前記内側ケースの前記蓋またはカップの一方が、前記前方および後方の端部のそれぞれに第2舌部を含み、前記蓋またはカップの他方が、前記前方および後方の端部のそれぞれに相補的な第2溝を含み、前記第2溝が、前記第2舌部に係合するように構成された請求項16に記載の人工椎間板。
- 前記溝が前記舌部より広く、それによって前記蓋およびカップが、互いに対して並進的に動くことができる請求項17に記載の人工椎間板。
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WO2006116852A1 (en) | 2006-11-09 |
RU2007144593A (ru) | 2009-06-10 |
EP1879529A4 (en) | 2009-12-16 |
JP4639256B2 (ja) | 2011-02-23 |
MX2007013140A (es) | 2008-04-17 |
CA2607315A1 (en) | 2006-11-09 |
AU2006243713A1 (en) | 2006-11-09 |
BRPI0609294A2 (pt) | 2010-03-23 |
US20080065216A1 (en) | 2008-03-13 |
RU2430705C2 (ru) | 2011-10-10 |
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