JP4875712B2 - 椎間板インプラント - Google Patents
椎間板インプラント Download PDFInfo
- Publication number
- JP4875712B2 JP4875712B2 JP2008543662A JP2008543662A JP4875712B2 JP 4875712 B2 JP4875712 B2 JP 4875712B2 JP 2008543662 A JP2008543662 A JP 2008543662A JP 2008543662 A JP2008543662 A JP 2008543662A JP 4875712 B2 JP4875712 B2 JP 4875712B2
- Authority
- JP
- Japan
- Prior art keywords
- intervertebral
- disc implant
- implant
- members
- 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.)
- Expired - Fee Related
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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
- A61F2/442—Intervertebral or spinal discs, e.g. resilient
- A61F2/4425—Intervertebral or spinal discs, e.g. resilient made of articulated components
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- A—HUMAN NECESSITIES
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- 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
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- 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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- A61F2/4455—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
- A61F2/4465—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 having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine
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- 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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- A61F2/4603—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
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- A61F2/28—Bones
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- 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
- A61F2/28—Bones
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- 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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
- A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
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- A—HUMAN NECESSITIES
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- 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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- A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
- A61F2002/3006—Properties of materials and coating materials
- A61F2002/30062—(bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
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- A61F2/02—Prostheses implantable into the body
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- A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
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- A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
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- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
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- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
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- 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
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- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
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- A61F2310/00976—Coating or prosthesis-covering structure made of proteins or of polypeptides, e.g. of bone morphogenic proteins BMP or of transforming growth factors TGF
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- Life Sciences & Earth Sciences (AREA)
- Public Health (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Cardiology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Veterinary Medicine (AREA)
- Physical Education & Sports Medicine (AREA)
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Description
第1の外側融合面及び内側連結面を有する第1の椎間部材と、
第2の外側融合面及び内側連結面を有する第2の椎間部材と、
上記第1の椎間部材と上記第2の椎間部材を接続する連結手段とを備え、
第1の椎間部材及び第2の椎間部材はそれぞれ、当該第1の椎間部材及び当該第2の椎間部材の互いに対する経時的な固定を可能にする骨架橋部を有し、
当該インプラントの上記第1の椎間部材及び上記第2の椎間部材は、挿入後少なくとも1日間、相対的に可動のままであり、当該インプラントは挿入後12ヶ月未満で固定インプラントに変わる、椎間板インプラントに関する。
椎間板インプラントの挿入であって、当該椎間板インプラントの第1の部材及び第2の部材が挿入後少なくとも1日間、相対的に可動のままであり、挿入後18ヶ月未満で固定インプラントに変わる、挿入を含む、治療を必要とする患者を治療する方法に関する。
本発明による椎間板インプラントは、人工椎間板置換術用の椎間板インプラントに関する。当該インプラントは概して、共に連結して椎間板インプラントを形成する2つの部材を含む。起立している個人の姿勢から見た場合、インプラントの上面及び底面を第1の外側融合面及び第2の外側融合面と呼ぶ。2つの部材の対向面は内側連結面として説明されているが、その理由は部材の連結手段がこの面に便宜上位置しているためである。連結手段は、第1の椎間部材と第2の椎間部材を接続する役割を果たす。椎間部材の連結は、上記第1の椎間部材及び上記第2の椎間部材の互いに対する動きを調整する。したがって、上記2つの椎間部材の連結は、当該部材を互いに対して強固に位置決めはしない。上記部材が連結すると、少なくとも一方の方向への当該部材のわずかな動きが可能となるものとする。
第1の外側融合面及び第1の内側連結面を有する第1の椎間部材と、
第2の外側融合面及び第2の内側連結面を有する第2の椎間部材と、
上記第1の椎間部材と上記第2の椎間部材を接続する連結手段とを備え、
第1の椎間部材及び第2の椎間部材はそれぞれ、当該第1の椎間部材及び当該第2の椎間部材の互いに対する経時的な固定を可能にする骨架橋部を有し、
当該インプラントの第1の椎間部材及び第2の椎間部材は、挿入後少なくとも1日間、相対的に可動のままであり、当該インプラントは挿入後18ヶ月未満で固定インプラントに変わる、椎間板インプラントに関する。
本発明による椎間板インプラントは、過渡安定化を可能にすると共に融合及び骨の内部成長によって長期固定を促す任意の形状を有することができる。
第1の椎間部材及び第2の椎間部材の連結手段は、第1の椎間部材及び第2の椎間部材の互いに対するわずかな動きを可能にするものとする。連結手段は好ましくは、第1の椎間部材及び第2の椎間部材の内側連結面に位置する。
一実施形態では、椎間板インプラントの外周は、椎体(the corpus)の外周よりも小さく、特に、椎体の底面はその前面側がインプラントに比して突出しているものとする。椎体はインプラントの縁を少なくとも0.2mm、例えば0.4mm、例えば0.6mm超えて突出することが好ましい。より好ましくは、インプラントの外周縁から椎体の縁までの距離は多くとも5mm、例えば2mm、例えば1.5mm、例えば1.0mmである。
本発明による椎間板インプラントは、埋め込みに適した任意の材料とすることができる。したがって、当該インプラントは、セラミック、ポリマー、及び金属から成る群が挙げられるがこれらに限定されない群から選択される、1つ又は複数の材料から構成され得る。好適には金属及びセラミックである。材料(複数可)は、インプラントへの処理前及び/又は処理後に、ガラス質状態、ゴム状態、半結晶状態、又は結晶状態とすることができる。
当該インプラントのコーティングは、埋め込み時に、及び埋め込み後の或る期間に、体液(例えば血液)からインプラントを保護するために行われ得る。コーティングを代替的に又は付加的に用いて、適した化合物を含めることによってインプラント付近での骨の成長を調整することができる。
一実施形態では、保護コーティングは、ポリラクチド(PLA)、ポリグリコリド(PGA)、ポリ無水物、ポリオルトエステル、ポリ(D、L−乳酸)、ポリ(ラクチド(lacide)−コ−グリコリド)(PLGA)、ポリ−D、L−乳酸−ポリエチレングリコール、ポリホスフェート、ゼラチンスポンジと複合化したポリ(ラクチド−コ−グリコリド)、ポリ(2−ヒドロキシエチルメタクリレート)、ポリ(N−ビニルピロリドン)、エチレン酢酸ビニル(EVA)、ポリ(メチルメタクリレート)、ポリ(ビニルアルコール)、ポリ(アクリル酸)、ポリアクリルアミド、ポリ(エチレン−コ−酢酸ビニル)、ポリ(エチレングリコール)、ポリ(メタクリル酸)、L−PLA及びポリカプロラクトン(PCL)のホモポリマー、ポリ(オルトエステル)、ポリ(無水物)のようなもの(like)、及びプソイド−ポリ(アミノ酸)から成る群から選択される材料を含む。
骨誘導剤及び/若しくは骨形成剤(複数可)又は他の生物学的活性成分を含有し得る。
本発明の第1の椎間部材及び第2の椎間部材は、本発明にしたがって骨架橋部を含み得る。かかる骨架橋部は骨の成長を促すと共に導く能力を有する。椎間部材は隣接椎骨部材への各部材の融合のために骨の成長を促し得る。本発明による椎間部材はさらに、当該部材の互いに対する経時的な固定のために骨の内部成長を導く。これにより、椎間板インプラントの第1の部材及び第2の部材の一時的な可動性が、挿入後の或る期間内で第1の椎間部材及び第2の椎間部材の固定に変わる。したがって、骨架橋部の含入により、第1の部材及び第2の部材の互いに対する経時的な固定が可能となる。
第1の外側融合面及び内側連結面を有する第1の椎間部材と、
第2の外側融合面及び内側連結面を有する第2の椎間部材と、
上記第1の椎間部材と上記第2の椎間部材を接続する連結手段とを備え、
第1の椎間部材及び第2の椎間部材はそれぞれ、当該第1の椎間部材及び当該第2の椎間部材の互いに対する経時的な固定を可能にする骨架橋部を有し、
当該インプラントの上記第1の椎間部材及び上記第2の椎間部材は、挿入後少なくとも1日間、相対的に可動のままであり、当該インプラントは挿入後18ヶ月未満で固定インプラントに変わる。
一実施形態では、椎間部材は骨の内部成長に適した1つ又は複数の開口を有し、かかる開口は、骨芽細胞及び骨形成原細胞の進入を可能にすると共にその生存性を維持するのに十分に大きい。開口は本発明の椎間部材内に通っており、当該部材を介する骨の内部成長を可能にする。開口は、椎間板インプラントの部材と適合性のある任意の形状又は大きさを有し得る。本明細書中の図は、異なる大きさ及び形状の複数の穴を含む実施形態を示す(図1〜図5)。
代替的に又は開口と組み合わせて、上記部材は外周の任意の形状の切込を有し得る(図3a)。切込及び開口はさらに、組み合わせてもよい(図3b)。
上記に見られるように、椎間板インプラントの部材は1つ又は複数の異なる材料から作製されてもよい。一実施形態では、充填材は、椎間板インプラントの開口/切込内に位置してもよく、それにより、充填インプラントが得られ、かかる充填材は、骨形成活動を導く且つ/又は促すか又は骨吸収を阻止するのに適した材料を含み得る。骨の自家移植片又は同種移植片を用いることができる。セラミック材料のような人工骨材が好適である。再吸収性セラミックス顆粒等の再吸収性材料がより好適であり、適した時間内で開口内での骨の形成を可能にする。当該インプラントは、本発明に従って、再吸収性セラミックス顆粒等の再吸収性材料で充填され、この再吸収性材料は適したパッケージングによって、骨の内部成長のタイミング及び程度に役立ち得る。
本発明による椎間板インプラントは周囲の椎骨と融合することができ、特に、椎間部材の外側融合面は隣接骨との融合に適している。
他の疾患の脊椎損傷に起因する腰痛を患っている個人は、椎間板インプラントの挿入によって緩和を得ることができる。背中の痛みは、椎間板変性症(Degenerated disk diseases)及び中央の椎間板ヘルニア(Central herniated disc)等の疾患に関連する場合もある。
椎間板インプラントの挿入であって、当該椎間板インプラントの第1の部材及び第2の部材が挿入後少なくとも1日は相対的に可動のままであり、挿入後18ヶ月未満で固定インプラントに変わる、挿入を含む、治療を必要とする患者を治療する方法に関する。
図は、本発明によるそら豆形状の椎間板インプラントの例を示す。図1aは、上から見た椎間板インプラント1のグラフィック図を示し、互いに直交する横断面を示し、開口、例えばこの実施形態の直線状通路6が示されている。2つの部材2の凹凸関係7が、対向部材のスロット5と係合する湾曲突起が提供する椎間板インプラントの連結手段4と共に示されている。この図はさらに、両部材の開口溝の対向位置を示す。図1bは、図1aの実施形態と同様に示される本発明の一実施形態であり、ここでは、連結手段4が両部材の最短の「直径」にわたって配置されている。図1cは、図1aのインプラントよりも少ない開口6を有するインプラントを示し、ここでは、連結手段4は、両部材の全長にわたっては延びていない突起/スロット構成5から形成されている。
内隙容積部を有する開口を含む、本発明による椎間板インプラントの他の例を示す。両部材内を通っている溝の直径は様々であり、空隙容積部8が図2a及び図2b双方に見られる。図2aに示す実施形態は、図2bに示す実施形態とは開口6の数及び位置が異なっている。他の相違点は連結手段4の配置に見られる。これらの図はさらに、インプラントの回転防止用に、第1の外側融合面及び第2の外側融合面上に位置するキール9を示す。
切込10(図3a)並びに開口6及び切込10(図3b)を含む、本発明による2つの実施形態を示す。異なる連結手段4を、対向面の適したスロット/くぼみに係合する長くて細い突起(図3a)及び小さな円形突起(図3b)によってさらに示す。図3bはさらに、粗い外表面11を有する椎間板インプラントを示す。
比較的多くの小さい開口に対する代替形態として、椎間部材が図4aに示すようにより少ない大きな開口6を含んでいてもよい。他の実施形態では、開口は、人工骨等の適した材料で充填12される(図4b)。
椎間部材の形状は、経椎間孔腰椎椎体間固定術(Transforaminal Lateral Interbody Fusion)用の椎間板インプラントを示す図5に見られるように種々の外科手技に最適化することができる。この図はさらに、両部材が連結手段4を含むフレームにすぎないため、開口6が占める容積を最適化し得る方法の一例を示す。
2 椎間部材
3 連結ゾーン
4 連結手段
5 突起/スロット構成
6 開口
7 凹凸関係
8 内隙容積
9 キール
10 切込
11 外表面
12 充填された開口
Claims (22)
- 人工椎間板置換術用の椎間板インプラントであって、
第1の外側融合面及び内側連結面を有する第1の椎間部材と、
第2の外側融合面及び内側連結面を有する第2の椎間部材と、
前記第1の椎間部材と前記第2の椎間部材の互いに対する動きを許容する、前記第1の椎間部材と前記第2の椎間部材を接続する連結手段とを備え、
前記第1の椎間部材と前記第2の椎間部材を接続する前記連結手段は、
突起を含む前記第1の椎間部材、及び、前記第1の椎間部材の該突起を受け入れる凹面を含む前記第2の椎間部材、
フランジ部を含む前記第1の椎間部材、及び、前記第1の椎間部材の上記フランジ部を受け入れるスロットを含む前記第2の椎間部材、又は、
上記第1の椎間部材と上記第2の椎間部材との間に位置するボール又はプレートを受け入れるためのへこみを有する前記第1の椎間部材及び第2の椎間部材を有し、
前記第1の椎間部材及び前記第2の椎間部材はそれぞれ、該第1の椎間部材及び該第2の椎間部材の互いに対する経時的な固定を可能にする骨架橋部を有し、
前記第1の椎間部材及び前記第2の椎間部材の該骨架橋部は、前記第1の椎間部材及び前記第2の椎間部材の容積の少なくとも10%を占める開口又は切込であり、及び
該インプラントの前記第1の椎間部材及び前記第2の椎間部材は、挿入後少なくとも1日間、相対的に可動のままであり、該インプラントは挿入後18ヶ月未満で固定インプラントに変わる、人工椎間板置換術用の椎間板インプラント。 - 前記連結手段は、
突起から成る前記第1の椎間部材、及び、前記第1の椎間部材の該突起を受け入れる凹面から成る前記第2の椎間部材、又は、
上記第1の椎間部材と上記第2の椎間部材との間に位置するボール又はプレートを受け入れるためのへこみを有する前記第1の椎間部材及び第2の椎間部材を有する、
請求項1に記載の椎間板インプラント。 - 前記第1の椎間部材及び前記第2の椎間部材の互いに対する固定は、骨の内部成長によって起こる、請求項1又は2に記載の椎間板インプラント。
- 前記第1の椎間部材及び前記第2の椎間部材は開口を有する、前記請求項1〜3のいずれか一項に記載の椎間板インプラント。
- 前記第1の椎間部材及び前記第2の椎間部材の前記開口は、該第1の椎間部材及び該第2の椎間部材が前記連結手段を介して互いと係合すると互いに対向する、請求項1〜4のいずれか一項に記載の椎間板インプラント。
- 前記椎間板インプラントの前記第1の椎間部材及び前記第2の椎間部材は、セラミック、ポリマー、及び/又は金属から作製される、請求項1〜5のいずれか一項に記載の椎間板インプラント。
- 前記椎間板インプラントの前記第1の椎間部材及び前記第2の椎間部材は、金属及び/又は金属合金から構成される、請求項1〜6のいずれか一項に記載の椎間板インプラント。
- 前記開口は充填される、請求項1〜7のいずれか一項に記載の椎間板インプラント。
- 前記開口はバイオセラミックス材料で充填される、請求項8に記載の椎間板インプラント。
- 前記バイオセラミックス材料は、ヒドロキシアパタイト、リン酸三カルシウム、又はこれら2つの混合物から成る群から選択される、請求項9に記載の椎間板インプラント。
- 前記第1の椎間部材及び前記第2の椎間部材(disk elements)の少なくとも一部はコーティングされる、請求項1〜10のいずれか一項に記載の椎間板インプラント。
- 前記開口の内表面はコーティングで被覆される、請求項11に記載の椎間板インプラント。
- 前記コーティングは保護用である、請求項11又は12に記載の椎間板インプラント。
- 前記コーティングは、1つ又は複数の骨誘導剤又は骨形成剤を含む、請求項11又は12に記載の椎間板インプラント。
- 前記連結手段が突起及びへこみによって提供される、請求項1〜14のいずれか一項に記載の椎間板インプラント。
- 前記連結手段がボール及びソケット構成によって提供される、請求項1〜15のいずれか一項に記載の椎間板インプラント。
- 前記突起が長くて細い突起である、請求項15に記載の椎間板インプラント。
- 前記突起が小さな円形である、請求項15に記載の椎間板インプラント。
- 前記椎間板インプラントは後方安定化手段によって支持されることができる、請求項1〜18のいずれか一項に記載の椎間板インプラント。
- 前記椎間板インプラントは前方挿入用である、請求項1〜19のいずれか一項に記載の椎間板インプラント。
- 前記椎間板インプラントは後方挿入用である、請求項1〜20のいずれか一項に記載の椎間板インプラント。
- 前記椎間板インプラントは経椎間孔腰椎椎体間固定術用である、請求項1〜21のいずれか一項に記載の椎間板インプラント。
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EP1959870B1 (en) | 2009-07-08 |
AU2006322455B2 (en) | 2012-04-12 |
DE602006007733D1 (de) | 2009-08-20 |
NZ568985A (en) | 2010-11-26 |
ATE435631T1 (de) | 2009-07-15 |
KR20080093097A (ko) | 2008-10-20 |
US20140309740A1 (en) | 2014-10-16 |
US20090270986A1 (en) | 2009-10-29 |
ES2332195T3 (es) | 2010-01-28 |
AU2006322455A1 (en) | 2007-06-14 |
JP2009518084A (ja) | 2009-05-07 |
WO2007065443A1 (en) | 2007-06-14 |
US8795372B2 (en) | 2014-08-05 |
US8007536B2 (en) | 2011-08-30 |
KR101374132B1 (ko) | 2014-03-14 |
US10357375B2 (en) | 2019-07-23 |
CA2632322A1 (en) | 2007-06-14 |
US20120083886A1 (en) | 2012-04-05 |
EP1959870A1 (en) | 2008-08-27 |
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