JP7706417B2 - 補綴回転ヒンジ膝アセンブリ、サブアセンブリ、および方法 - Google Patents
補綴回転ヒンジ膝アセンブリ、サブアセンブリ、および方法 Download PDFInfo
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- JP7706417B2 JP7706417B2 JP2022092375A JP2022092375A JP7706417B2 JP 7706417 B2 JP7706417 B2 JP 7706417B2 JP 2022092375 A JP2022092375 A JP 2022092375A JP 2022092375 A JP2022092375 A JP 2022092375A JP 7706417 B2 JP7706417 B2 JP 7706417B2
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- femoral
- tibial
- bore
- rotating hinge
- arm
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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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Landscapes
- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Transplantation (AREA)
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- Oral & Maxillofacial Surgery (AREA)
- Cardiology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Physical Education & Sports Medicine (AREA)
- Prostheses (AREA)
Description
本出願は、2021年7月23日に出願された米国仮特許出願第63/225,109号の利益を主張する。本関連出願の開示は、その全体が本開示に組み込まれる。
本開示は、概して、膝インプラントの分野に関し、より具体的には、修正のための回転ヒンジインプラントおよび主要な膝およびそれらの移植方法に関する。
回転ヒンジ式膝インプラントは、典型的には、患者の膝の生来の靱帯および他の保持解剖学的構造が深刻に損なわれている状況において、修正膝手術で使用される。非回転ヒンジ式膝インプラントは、失われた後十字靱帯(「PCL」)の安定機能を置き換えるために初期に使用された。しかしながら、外科医は早くから単純なヒンジ膝が摩耗および故障を加速させやすい傾向があることを認識していた。この問題は、屈曲中に脛骨が大腿骨に対して概ね垂直な脛骨軸の周りを回転するように、回転ヒンジ機能を提供することによって対処された。この目的のためにいくつかの設計が使用されている。例えば、米国特許第6,773,461号および米国特許第10,682,236号を参照されたい。
図5は、本開示の回転ヒンジ膝補綴インプラントアセンブリ1で使用するための大腿骨ボックス80(すなわち、例示的な第1の関節要素)の一実施形態の斜視図を示す。図5の実施形態では、大腿骨ボックス80は、概してクレビス構成を有する。大腿骨ボックス80は、前端部61上の主要本体部分91と、そこから後端部52に向かって後方に延在する一対の対向するアーム82、86と、を含む。描写される実施形態において、アーム82、86は、クレビスアームの形態をとる。一対の対向するアーム82、86は、対向するアーム82、86の内面90の間にギャップ57を画定する。ギャップ57は、ヨーク40のヘッド24の幅、および望ましくは任意の取り付けられたベアリング部材60の幅に適合するようなサイズに設定される。大腿骨ボックス80の主要本体部分91は、それを通って延在する大腿骨ボックス固定ボア81を設けている。追加的に、対向するアーム82、86はそれぞれ、横方向ヒンジピン50(図4)を受容するためにそこを通って延在するアームボア85、88(すなわち、第1のアーム82は第1のアームボア85を画定し、第2のアーム86は第2のアームボア88を画定する)を設けている。アームボア85、88は、それぞれのアーム82、86に形成される。一対のアームボア85、88は、互いに(横方向軸TRに沿って)実質的に軸方向に整列し、それによって、アーム82、86の間の開口部にわたる連続したヒンジピンボアを提供する。
図6は、脛骨ヨーク40のヘッド24の横方向ヒンジボア25内に延在するベアリング面を有するようにサイズ設定された例示的なベアリング部材60を描写する。このベアリング部材60は、設置された位置に配設されたときに、大腿骨ボックス80内およびヨークヘッド24および横方向ヒンジピン50の周りで自由に回転することができる(図2を参照)。ある特定の例示的な実施形態は、2つ以上のベアリング部材60を備えることができることが理解され得る。ベアリング部材60は、横方向ヒンジピン50(または横方向ヒンジピン50の一部分)を密接に受容するように構成されているベアリングボア75を画定する。このようにして、横方向ヒンジピン50は、ベアリングボア75によって支持され、かつベアリングボア内で回転する。横方向ヒンジピン50の端部53は、大腿骨ボックス80の軸方向に整列したアームボア85、88に配設される。このようにして、大腿骨ボックス80は、回転ヒンジサブアセンブリ10の横方向軸TRの周りにヒンジ式に回転するように構成されている。他の実施形態は、横方向ヒンジピン50に円周方向に当接し、アームボア85、88を通って延在する、ベアリングスリーブを使用して、横方向回転軸TRの周りにヒンジ式回転を達成する。
図7Aは、回転ヒンジ膝補綴インプラントアセンブリ1で使用するための補綴脛骨ヨーク40(すなわち、例示的な第2の関節要素)の一実施形態の側面図を示す。ある特定の例示的な実施形態では、脛骨ヨーク40は、本体部材45と、本体部材45の第2の端部77から下向きに延在する脛骨軸方向ポスト20と、を有するユニボディ(すなわち、単一の連続的な)構造である。本体部材45の第2の端部77は、本体部材45の第1の端部67から遠位に配設される。ヘッド24は、本体部材45の第1の端部67から延在する。ヘッド24は、そこを通って延在する横方向ヒンジボア25を画定する。他の例示的な実施形態では、脛骨軸方向ポスト20および本体部材45、または本体部材およびヘッド24は、回転ヒンジ膝補綴インプラントアセンブリ1に挿入する前に、望ましくは脛骨ヨーク40に組み立てられるコンポーネントに別々に製造され得る。
図8A~8Cは、例示的な回転ヒンジ膝補綴インプラントアセンブリ1で使用するための伸展ストップ30の一実施形態の図を示す。モジュール式伸展ストップ30は、モジュール式伸展ストップ30が回転ヒンジサブアセンブリ10に係合されていない、アンインストール位置に存在することができる。モジュール式伸展ストップ30はまた、モジュール式伸展ストップが回転ヒンジサブアセンブリ10の伸展ストップ部分28に係合されている、係合位置に存在することができる。図8Aにおいて、モジュール式伸展ストップ30は、後側の実質的に平坦または平坦な最上面34を有することが分かる。図10に描写される実施形態では、最上面34は、当接部分36の中に立ち上がる。当接部分36は、膝が伸展しているときに、大腿部コンポーネント205の膝蓋骨溝内にフィットする。ある特定の例示的な実施形態では、当接部分36は、膝が伸展しているときに大腿部コンポーネント205の膝蓋骨溝を継続する凹状の前部を有することができる。このようにして、例示的なモジュール式伸展ストップ30は、大腿部コンポーネント205の膝蓋骨溝内に嵌合し、大腿部コンポーネント205によって画定される膝蓋骨溝を継続するように構成され得、これは、伸展と屈曲との間の滑らかな遷移を可能にする(図12を参照)。ディップ39は、最上面34を当接部分36から分離する。このディップ39は、大腿部コンポーネント205の過度の伸展(例えば、負の屈曲、または間違った方向への膝の曲げ)を防止する。
図9は、本開示の回転ヒンジ膝補綴インプラントアセンブリ1で使用するための大腿骨締結具210の一実施形態の最上面斜視図を示す。図示の実施形態では、大腿骨締結具210は、螺合先端部211、後端部215上の先細りヘッド212、および螺合先端部211と先細りヘッド212との間の滑らかなシャンク部分214を含む。螺子山216は、典型的には、機械加工された螺子山である。螺合先端部211に接近する螺合部分の螺子山216は、大腿骨ボックス固定ボア81への大腿骨締結具210の設置を容易にするために、望ましくは面取りされるか、または先細りにされる。すなわち、螺合先端部211における大腿骨締結具210の直径は、望ましくは、大腿骨固定ボア87の内径よりも小さい。より小さな直径の螺合先端部211を比較的大きな直径の大腿骨固定ボア87内に誘導することにより、大腿骨固定ボア87内に大腿骨締結具210の螺合先端部211を外科医が最初に挿入するときに低精度でも可能にし、それによって、大腿骨締結具210を介して大腿骨ボックス80の大腿部コンポーネント205への係合を容易にするように構成されている。
実施形態では、大腿部コンポーネント205は、改善された関節機能のための特徴を備えている。大腿骨ステム155は典型的には、大腿骨ボアに挿入されて、切除された大腿骨顆上に大腿部コンポーネント205を据え付ける。大腿部コンポーネント205は、120度を超える屈曲を提供するように構成されている。大腿部コンポーネント205は、中断のない膝蓋骨運動学を提供するように構成され得る。ある特定の例示的な実施形態では、長さ約16~約18mmの大腿骨ボックス空洞280(図2A)が、回転ヒンジサブアセンブリ10の大腿骨ボックス80のために提供される。大腿部コンポーネント205は、大腿部増強部、オフセットアダプタ、およびモジュール式ステム、ならびにモジュール式伸展ストップ30などの既存の修正コンポーネントと互換性があるように構成され得る。
図4を参照すると、脛骨コンポーネント105は、脛骨軸方向ポスト20を受容するための適合軸方向ボア104を含む。
動作中、本開示の回転ヒンジ膝補綴インプラントアセンブリ1は、前方アプローチを使用して回転ヒンジサブアセンブリ10の遠位固定を可能にするように設計される。
Claims (10)
- 回転ヒンジサブアセンブリ(10)用の人工関節脛骨ヨーク(40)であって、
第1の端部(67)に配設されたヘッド(24)を有する本体部材(45)と、
前記本体部材(45)の第2の端部(77)から延在する脛骨軸ポスト(20)と、
前記第1の端部(67)から遠位に配設されている第2の端部(77)と、
その第1外側側面および第2外側側面を貫通する横方向ヒンジボア(25)を画定するヘッド(24)と、
これを横方向に貫通する横軸(TR)を画定する横方向ヒンジボア(25)と、
これを長手方向に貫通する正中軸を確定する脛骨軸ポスト(20)と、を備え、
基準軸は、横軸(TR)をほぼ直交し、正中軸にほぼ平行に延びており、
オフセット距離(D)は前記正中軸を前記基準軸から分離しており、
前記人工関節脛骨ヨーク(40)は、さらに、ヘッド(24)と脛骨軸ポスト(20)との間に延びる延長ストッパー部(28)を備え、前記延長ストッパー部(28)は、スナップフィットポケット(29)を備え、
前記脛骨ヨーク(40)は、その底部から延びるロックタブを有するモジュラー延長ストッパー(30)をさらに備え、前記ロックタブは、前記モジュラー延長ストッパー(30)が設置位置にあるときに、ヨーク(40)の延長ストッパー部分(28)のスナップフィットポケット(29)内に延びるように構成されている、回転ヒンジサブアセンブリ(10)用の人工関節脛骨ヨーク。 - 前記脛骨軸ポスト(20)、前記本体部材(45)、および前記ヘッド(24)が、単一の連続した構造である請求項1に記載の脛骨ヨーク。
- 前記オフセット距離(D)が、12mm~15mmからなる距離の範囲から選択される請求項1又は請求項2に記載の脛骨ヨーク。
- 前記脛骨軸ポストが、ポスト長(L)をさらに含み、前記ポスト長(L)が、40mm~70mmの値を有する請求項1~3のいずれか1項に記載の脛骨ヨーク。
- 回転ヒンジサブアセンブリ(10)であって、
請求項1~4のいずれか1項に記載の脛骨ヨーク(40)と、
大腿骨ボックス(80)と、
を備え、
前記大腿骨ボックス(80)は、
本体部(91)から後方に延びる第1アーム(82)および第2アーム(86)と、
膝関節人工関節の大腿骨コンポーネント(205)の大腿骨ボックスキャビティ(280)の横断表面(92)に係合するように構成された大腿骨固定機構を有する前記本体部(91)と、
前記第1アーム(82)および前記第2アーム(86)は、それぞれ軸方向に整列した第1および第2アームボア(85、88)を画定し、
前記第1アーム(82)は第1側面に隣接して配置され、第2アーム(86)は第2側面に隣接して配置され、前記第1アームボア(85)と前記第2アームボア(88)は横方向ヒンジボア(25)と軸方向に整列し、
横方向ヒンジボア(25)を貫通して第1アームボア(85)および第2アームボア(88)内に延びる横ヒンジピン(50)と、
を備える回転ヒンジサブアセンブリ。 - 前記第1アーム(82)および前記第2アーム(86)は前記ヘッド(24)の側面に対して面一に配置され、前記横ヒンジピン(50)は大腿骨ボックス(80)の前記第1および前記第2アーム(82、86)を超えて延びない請求項5に記載の回転ヒンジサブアセンブリ。
- 前記ヘッド(24)の第1側面と前記第1アーム(82)との間に配置された第1ベアリング(60)と、前記ヘッド(24)の第2側面と前記第2アーム(86)との間に配置された第2ベアリング(60)と、をさらに備える請求項5又は請求項6に記載の回転ヒンジサブアセンブリ。
- 前記大腿骨ボックス(80)は、コバルトクロムモリブデン合金、チタン合金、ジルコニア強化アルミナセラミック、セラミック材料、超高分子量ポリエチレン、ポリエーテルエーテルケトン、それらの組み合わせ、および他の生体適合性があり臨床的に証明された関節材料からなる材料群からの材料から作製される請求項5~7のいずれか1項に記載の回転ヒンジサブアセンブリ。
- 前記大腿骨固定機構は、大腿骨固定具(210)を受け入れるように構成された大腿骨ボックス固定ボア(81)、突起、受容部、複数の突起、複数の受容部、磁石、クランプ、フック、リップ、結合剤、接着剤、およびそれらの組み合わせからなる群から選択される請求項5~8のいずれか1項に記載の回転ヒンジサブアセンブリ。
- 請求項5~9のいずれか1項に記載の回転ヒンジサブアセンブリ(10)を備え、
前記大腿骨ボックス(80)は、大腿骨ファスナー(210)を介して大腿骨コンポーネント(205)に機械的に係合するように構成され、
前記大腿骨ファスナー(210)は、膝が屈曲または伸展しているときに脛骨回転軸(A)と非軸方向に整列し、前記回転ヒンジサブアセンブリ(10)の横方向に延びるヒンジピン(50)は、設置構成において前記大腿骨コンポーネント(205)に機械的に係合しない、回転ヒンジ膝人工関節インプラントアセンブリ。
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| CN119015020A (zh) | 2024-11-26 |
| ES3053933T3 (en) | 2026-01-28 |
| EP4122427B1 (en) | 2023-11-15 |
| EP4241740A3 (en) | 2023-12-06 |
| CA3159231A1 (en) | 2023-01-23 |
| PL4241740T3 (pl) | 2026-02-23 |
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