JP4105721B2 - 経皮移植用椎間板髄核プロテーゼ - Google Patents
経皮移植用椎間板髄核プロテーゼ Download PDFInfo
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- JP4105721B2 JP4105721B2 JP2005325192A JP2005325192A JP4105721B2 JP 4105721 B2 JP4105721 B2 JP 4105721B2 JP 2005325192 A JP2005325192 A JP 2005325192A JP 2005325192 A JP2005325192 A JP 2005325192A JP 4105721 B2 JP4105721 B2 JP 4105721B2
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- Prior art keywords
- amorphous polymer
- polymer core
- prosthesis
- nucleus pulposus
- jacket
- 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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- 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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- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/441—Joints for the spine, e.g. vertebrae, spinal discs made of inflatable pockets or chambers filled with fluid, e.g. with hydrogel
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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
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/0096—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers
- A61F2250/0098—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers radio-opaque, e.g. radio-opaque markers
Description
本発明は、人体の椎間板の空間の髄核空洞の奥深くに移植する細長い椎間板髄核プロテーゼと、そのようなプロテーゼを製造する方法を提供する。髄核空洞は対向する脊骨体により規定され、対向する端板と、線維輪を形成する。プロテーゼは、アモルファス(非晶質)ポリマーコアを保持する、実質的に非弾性の拘束ジャケットを含む。
図1に椎間板髄核プロテーゼ20の好ましい実施形態を示す。椎間板髄核プロテーゼ20は、非晶質ポリマコア22と拘束ジャケット24からなるカプセル形状のボディである。拘束ジャケット24は前端26と後端28により定義され、前端26に位置する前クロージャ30と後端28に位置する後クロージャ32とにより、非晶質ポリマコア22の周りに固定される。
好ましい実施形態では、非晶質ポリマコア22は液体を吸収する様に構成されたヒドロゲルであり、非ヒドロゲル状態からヒドロゲル状態へと拡張する。これに関して、ヒドロゲル材料は好ましくはヒドロゲル・ポリアクリロニトリルの混合物として規定される。特に、アクリルアミドとアクリルニトリル(ブロック共重合体)が使用される。その代わりに、非晶質ポリマコア22に使用されるヒドロゲル材料は、独特の複数ブロック共重合体構造を持つ任意の親水性のアクリラ−ト誘導体でも可能であり、または、負荷の配置や除去に応じた所望の方法で変形、再生が可能な任意の他のヒドロゲル材料でも可能である。さらに、種々のストレス下でその構造を維持しながら液体を吸収することが可能な生化学的に安全なポリマ又はエラストマが許される。例えば、非晶質ポリマコア22はポリビニルアルコールと水の混合物として規定され得る。一の好ましい実施形態では、非晶質ポリマコア22について使用されるヒドロゲル材料は、ハイメディクスインターナショナル社(Hymedix International, Inc, デイトン、NJ)の登録商標HYPANで製造される。
拘束ジャケット24は、完全に非晶質ポリマージャケット22を囲んでいる。拘束ジャケット24は、好ましくは目が細かく編まれた高分子の高靭性重合体繊維で作成されたカプセル形チューブである。好ましい実施の形態において、高分子ポリエチレンは拘束ジャケット24用の織る材料として使用される。しかしながら、ポリエステルまたはその他の高分子の高靭性重合体材料が使用されることも可能であり、カーボンファイバヤーン、セラミックファイバ、金属ファイバ等も使用可能である。拘束ジャケット24は、それ自体が可撓性を有するが、拘束ジャケット24を構成する材料は、可撓性を有しない。言い換えれば、拘束ジャケット24を構成する材料は、実質的に伸縮性を有しない。
1つの実施の形態において、本発明の椎間板髄核プロテーゼ20は、椎間板空洞(以下に記載されている)内に合う大きさに作られた拘束ジャケット24を選択することによって作成される。拘束ジャケット24の後方端28は、後方クロージャ32によって縫い合わされる。後方クロージャ32は、拘束ジャケット24に使用されるものと同一の高分子ポリエチレンのような高靭性ポリマー材料で構成されている縫い目である。非晶質ポリマーコア22(非水和状態)は、開口部、つまり前方端26から拘束ジャケット24に注入される。その後、前方端26は、前方クロージャ30によって閉鎖される。拘束ジャケット24の前方端26の閉鎖後、椎間板髄核プロテーゼ20は、非晶質ポリマーコア22を水平方向に向けるために揉まれる。非晶質ポリマコア22は、移植の準備として、椎間板髄各プロテーゼ20を部分的に平らにしかつ狭くしている。
一つの好ましい実施例では、椎間板髄核プロテーゼ20は、好ましくは、皮膚を通過して図3−5に図示した損傷した椎間板空洞60に移植される。椎間板空洞60は二つの接近した二つの脊椎に分割して、対向する端部のプレート(不図示)を決定し、そして、環状(anulus)64および髄核空洞66(図5)を含む。移植は好ましくは後のアプローチを経て行われるが、前または斜めの技術が採用されてもよい。後の方法では、ターゲットとする薄にエリア68での交互の積層物が要求される。図4に示したように、フラップ70が環状64に形成され、そして、そしてもし必要なら、椎間板髄核プロテーゼ20のためのルームの形成のために、過剰の材料が髄核空洞66(図5)から除去される。髄核空洞66の適した容積が見積もられ、そして椎間板髄核プロテーゼ20が選択される。
椎間板髄核プロテーゼ120のそれに代わる実施形態が図9及び図10に図示されている。椎間板髄核プロテーゼ120は、非晶質ポリマーコア122と拘束ジャケット124を備えていることによって、上に記述されたそれに非常に類似している。上記拘束ジャケット124は、上述の拘束ジャケット24(図1)と同一であり、前方端部(anterior end)126、後方端部(posterior end)128、前方閉鎖部(anterior closure)130及び後方閉鎖部(posterior closure)132を含む。しかしながら、非晶質ポリマーコア122は複数のヒドロゲルマイクロチップによって特徴付けられる。上記複数のヒドロゲルマイクロチップ122は、好ましくは上に述べられたものと同一のヒドロゲル材料で製造される。しかしながら、上述の非晶質ポリマーコア22(図1)とは異なり、複数のヒドロゲルマイクロチップ122は特定の形状を有するように製造される。
上述のように、好ましい椎間板髄核プロテーゼ20(図1)は、非晶質ポリマーコア22(図1)にヒドロゲル材料を採用する。しかし、非親水性で生物学的適合性のあるポリマーもまた、有用であることが認識されるべきである。特に、第1の状態で流動的で(または、流動性が保たれ)あり、第2の状態で硬化するか、または、非流動となる非親水性ポリマーが使用できる。この明細書で使用される「非親水性」という言葉は、親水性材料だけでなく、水とわずかに親和力のある材料も含むことが理解されるべきである。従って、材料の体積全体と比較して、大量の水を吸収し保持することができない任意の材料は「非親水性」とみなされる。その「流動的」な第1状態は、例えば後に分離される溶媒中にポリマーを保持すること、触媒を利用すること、および、そのポリマーを熱して溶解状態にすること等のような、多くの異なる方法で達成できる。例えば、酢酸を有するシリコンゴム(RTV)は流動的である。しかし、一旦露出すると、その酸は分離され、シリコンゴムは硬くなる。
Claims (9)
- 互いに対峙する端板を形成する一対の椎体で画成される椎間板の髄核空洞に移植する椎間板髄核プロテーゼであって、
前記髄核空洞の容積よりも小さい最大容積を有するほぼ非弾性の拘束ジャケットと、
前記拘束ジャケットの前記最大容積より少ない量となるように前記拘束ジャケット内に注射器によって流入された非晶質ポリマー・コアであって、前記拘束ジャケットの最大容積まで膨張することによって前記拘束ジャケット内に内圧を発生させるように構成されている非晶質ポリマー・コアと
を備え、
前記非晶質ポリマー・コアが、非水和状態から水和状態へ膨張しうる、形状が不規則な複数の細粒からなるヒドロゲル粉末であって、
前記ヒドロゲル粉末の前記不規則形状の前記複数の細粒が、それ自身の幅もしくは長さよりも小さい高さを有する偏平形である、椎間板髄核プロテーゼ。 - 前記拘束ジャケットは高さを規定し、前記高さは前記内圧に応じて実質的に増加する、請求項1に記載の椎間板髄核プロテーゼ。
- 前記拘束ジャケットは、前記髄核空洞の互いに対峙する前記端板により応力を受けて、ほぼ楕円断面を呈するように構成されている、請求項1に記載の椎間板髄核プロテーゼ。
- 前記非晶質ポリマー・コアが椎間板空洞の輪郭に合うように構成されている、請求項1に記載の椎間板髄核プロテーゼ。
- 前記非晶質ポリマー・コアは、少なくとも第1の時間間隔にわたって、前記拘束ジャケットの中で流動状態のままである、請求項1に記載の椎間板髄核プロテーゼ。
- 前記非晶質ポリマー・コアが、非水和状態から水和状態へ膨張しうるヒドロゲルからなる、請求項1に記載の椎間板髄核プロテーゼ。
- 前記拘束ジャケットの最大容積は、非水和状態にある非晶質ポリマー・コアの体積よりも大きいが、水和状態にある非晶質ポリマー・コアの体積よりも小さく、前記内圧は、非水和状態から水和状態へ変化する非晶質ポリマー・コアの膨張圧である、請求項6に記載の椎間板髄核プロテーゼ。
- 互いに対峙する端板を形成する一対の椎体で画成される椎間板の髄核空洞に移植する椎間板髄核プロテーゼであって、
前記髄核空洞の容積よりも小さい最大容積を有するほぼ非弾性の拘束ジャケットと、
前記拘束ジャケットの前記最大容積より少ない量となるように前記拘束ジャケット内に注射器によって流入された非晶質ポリマー・コアであって、前記拘束ジャケットの最大容積まで膨張することによって前記拘束ジャケット内に内圧を発生させるように構成されている非晶質ポリマー・コアと
を備え、
前記非晶質ポリマー・コアが、非水和状態から水和状態へ膨張しうる、形状が不規則な複数の細粒からなるヒドロゲル粉末であって、
前記ヒドロゲル粉末の不規則形状の前記複数の細粒が、低摩擦材で被覆されてなる、椎間板髄核プロテーゼ。 - 互いに対峙する端板を形成する一対の椎体で画成される椎間板の髄核空洞に移植する椎間板髄核プロテーゼであって、
前記髄核空洞の容積よりも小さい最大容積を有するほぼ非弾性の拘束ジャケットと、
前記拘束ジャケットの前記最大容積より少ない量となるように前記拘束ジャケット内に注射器によって流入された非晶質ポリマー・コアであって、前記拘束ジャケットの最大容積まで膨張することによって前記拘束ジャケット内に内圧を発生させるように構成されている非晶質ポリマー・コアと
を備え、
前記非晶質ポリマー・コアが、複数のヒドロゲルマイクロチップからなると共に、
前記ヒドロゲル・マイクロチップのそれぞれの外表面の少なくとも一部分が偏平である、椎間板髄核プロテーゼ。
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US09/039,582 US6022376A (en) | 1997-06-06 | 1998-03-16 | Percutaneous prosthetic spinal disc nucleus and method of manufacture |
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JP2005325192A Expired - Fee Related JP4105721B2 (ja) | 1998-03-16 | 2005-11-09 | 経皮移植用椎間板髄核プロテーゼ |
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JP2014221399A (ja) * | 2008-01-16 | 2014-11-27 | エイチエイチ・スパイナル・エルエルシー | 関節を置き換える装置 |
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BR9908824A (pt) | 2001-12-18 |
US6022376A (en) | 2000-02-08 |
JP2002506678A (ja) | 2002-03-05 |
ZA200005580B (en) | 2002-03-11 |
AU742901B2 (en) | 2002-01-17 |
EP1063948A1 (en) | 2001-01-03 |
EP1063948B1 (en) | 2007-03-07 |
JP2006116327A (ja) | 2006-05-11 |
CA2323922C (en) | 2004-03-09 |
JP2007289728A (ja) | 2007-11-08 |
AU3007699A (en) | 1999-10-11 |
WO1999047082A1 (en) | 1999-09-23 |
KR100647762B1 (ko) | 2006-11-23 |
CA2323922A1 (en) | 1999-09-23 |
ATE355802T1 (de) | 2007-03-15 |
ES2283108T3 (es) | 2007-10-16 |
KR20010041891A (ko) | 2001-05-25 |
EP1063948A4 (en) | 2003-03-05 |
DE69935425D1 (de) | 2007-04-19 |
DE69935425T2 (de) | 2007-10-31 |
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