JP7126959B2 - 多孔質金属デバイス - Google Patents
多孔質金属デバイス Download PDFInfo
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- JP7126959B2 JP7126959B2 JP2018569163A JP2018569163A JP7126959B2 JP 7126959 B2 JP7126959 B2 JP 7126959B2 JP 2018569163 A JP2018569163 A JP 2018569163A JP 2018569163 A JP2018569163 A JP 2018569163A JP 7126959 B2 JP7126959 B2 JP 7126959B2
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- titanium
- nickel
- nitinol
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Description
本出願は、Hokuto Aihara、John Zider、Robert B Zider、Gary S Fanton、Scott Carpenter及びThomas Duerigによって2016年7月5日に出願された米国仮特許出願第62/358,407号明細書の優先権及び利益を主張する。本出願の全内容は、あらゆる目的のために参照により本明細書に援用される。
ニッケル-チタン構成要素の弾性率及び他の性質は、骨が内部成長することができる基材を構成要素が提供するように、骨との融和性があるように選択され得る。使用において、本発明のデバイスは、好ましくは、多孔質ニッケルチタン構成要素の表面が海綿骨又は皮質骨に隣接するように哺乳類に植え込まれる。
構成要素は、その毛管現象及び/又はその形状を含むがこれらに限定されない、その性質を変更するための1つ以上の処理を施され得る。毛管現象は、多孔質構成要素が液体(例えば、水)を吸収し、且つ/又は湿潤表面を有する機能を指す。
デバイスは、好ましくは、隣接する海綿骨又は皮質骨の剛性と同様の剛性を呈し、耐移動性及び耐衝撃性も提供する。PEEK又は同様の高分子組成物から構成される第2の構成要素を用いることで、骨の内部成長及びデバイスの固定を、骨の内部成長の検査のための放射線不透過性と併せて達成するという課題を解決することが可能である。PEEK又は同様の高分子組成物から構成される第2の構成要素を含むデバイスは、機械的取り付け、熱と圧力とを組み合わせて加えることによる多孔質ニチノールへのPEEKのリフロー、接着剤結合、インサート成形、圧入及び超音波溶接を含むが、これらに限定されないいくつかの手法で組み立てることができる。
本発明の多孔質ニッケル-チタン構成要素を調製する方法の1つは、燃焼合成(CS)又は自己伝播型高温合成(SHS)である。このような方法では、2種以上の元素粉末(この場合、ニッケル粉末とチタン粉末とを含む混合物)を互いに反応させ、より安定な化合物を形成することで、反応を自己伝播させるのに十分な熱を放出する。2種の粉末の反応によって放出される熱の量は、混合物の温度を、形成される新たな化合物の融点に近づけるのに十分であることが好ましい。この方法は、圧縮粉末混合物を炉内に入れることによって開始することができる。
慎重に選択した粉末の燃焼合成又は焼結によって生成される多孔質ニチノールは、多くの場合、50%を超える高い気孔率を呈する金属間化合物を形成する方法を提供する。合成される生成物の気孔率及び孔サイズを制御する従来の方法は、粉末の違い及びプロセス条件に分類され得る。
一実施形態では、多孔質ニチノール物品は、下層の部分的又は完全に多孔質の基材に取り付けられている。
(i)予備形成された高分子構成要素を多孔質ニッケル-チタン構成要素に、これら構成要素の1つ又は両方を加熱し、これらを押し合わせることによって取り付けること、(ii)予備形成された高分子構成要素を高周波又は超音波ボンディングによって多孔質ニッケル-チタン構成要素に取り付けること、(iii)金属シートをその融点近傍の温度まで加熱し、多孔質ニッケル-チタン構成要素に押しつけることによって金属シートを多孔質ニッケル-チタン構成要素に取り付けること、(iv)多孔質ニッケル-チタン構成要素になる金属粉末を型に充填し、粉末に点火すること、(v)多孔質ニッケル-チタン構成要素の露出表面の少なくとも一部分に放電加工を施すこと、(vi)ニッケル-チタン構成要素の露出表面に差動機械加工、差動ブラスト仕上げ又は差動放電加工を施すことで、その露出表面が第1の表面特性、例えば摩擦係数及び/又は吸上性能を有する第1のエリアと、第2の表面特性を有する第2のエリアとを含むニッケル-チタン構成要素を作成すること、(vi)多孔質ニッケル-チタン構成要素の露出表面に、電子ビーム溶解及び選択的レーザ焼結法が挙げられるが、これらに限定されない異なる付加製造方法を施すこと、及び(vii)同様の又は異なる材料を用いて所望の形状を多孔質ニッケル-チタン構成要素の表面上に成長させること。
外径0.250’’±0.05’’×長さ1.5’’(外径6±1.3mm×長さ38mm)の寸法を有する多孔質ニチノールの円筒状試料をEDM(放電加工)によって作成した。この試料は、平均気孔率64.3%及び平均孔サイズ216±57μmを有していた。多孔質ニチノールは、弾性率(GPa)1.56、最大引張強度(MPa)27、気孔率(%)64.3、孔サイズ(μm)216及び孔サイズ標準偏差(μm)57を有していた。
外径20mm×長さ38mmの寸法を有する多孔質ニチノールの円筒状試料を作成した。この試料は、平均気孔率64.3%及び平均孔サイズ216±57μmを有していた。多孔質ニチノールは、弾性率(GPa)1.56、最大引張強度(MPa)27、気孔率(%)64.3、孔サイズ(μm)216及び孔サイズ標準偏差(μm)57、平均気孔率64.3%を有していた。
外径1.0’’(25.4mm)、厚さ0.25’’(6.35mm)を有する多孔質ニチノールの3つの試料に衝撃試験を実施し、同一の寸法及びサンプルサイズを有する多孔質チタン及びPEEK材料と比較した。
多孔質ニチノールの毛管現象特性を測定するために検討を行った。平均気孔率は、64%であった。開放気孔率は、64%のうちの95.2%であると決定された。開放気孔率の相対比率は、多孔質サンプルを脱イオン水中で飽和させ、吸収された水の合計を量ることによって決定した。多孔質ニチノールは、後のアニーリングを伴う自己伝播型高温合成又は燃焼合成による粉末冶金法によって得た。各試料は、EDMによって機械加工した。各試料は、標準的な円筒形状(φ10.0±0.25mm×長さ30.0±0.10mm)を有していた。
平均気孔率68.7%を有する多孔質ニチノールを用いて、平均気孔率64.3%を有する多孔質ニチノールから構成されたコア基材に外層を設けた。外層は、弾性率(GPa)0.93、最大引張強度(MPa)15.1、孔サイズ(μm)456及び孔サイズ標準偏差(μm)109を有していた。コア基材は、弾性率(GPa)1.56、最大引張強度(MPa)27、孔サイズ(μm)216及び孔サイズ標準偏差(μm)57を有していた。
平均気孔率68.7%を有する多孔質ニチノールを用いて中実ニチノール管を封入した。多孔質ニチノールは、弾性率(GPa)0.93、最大引張強度(MPa)15.1、孔サイズ(μm)456及び孔サイズ標準偏差(μm)109を有していた。
サンプルA~Cは、SHSプロセスによって作成した多孔質ニチノール構成要素である。サンプルA~Cの気孔率は、それぞれ63±1%、63±1%及び68±1%である。サンプルA~Cの平均孔サイズは、それぞれ211、213及び203μmである。以下の表は、サンプルの気孔径分布、孔の特性及び機械的特性を記載する。
添付の図面において、
参照番号1は、本発明の多孔質ニッケル-チタン構成要素を示す。構成要素には、上述のように、1種以上の治療薬又は生物学的製剤を装填することができる。
以下の説明は、本発明の特定の実施形態を記載及び定義する。
Claims (14)
- 第1の構成要素であって、x原子%のチタン及び(1-x)原子%のニッケルを含むニッケルとチタンとの合金(30≦x≦70)から構成され、且つ、開放多孔質構造を有し、前記孔の95%超は、50~1000μmのサイズを有する、第1の構成要素と、
鍛造ニチノールを含む、第2の構成要素と、
を含むデバイス。 - 前記合金のxは、48≦x≦52である、請求項1に記載のデバイス。
- 前記第1の構成要素においては、平均孔サイズは、100~600μmであり、孔サイズ標準偏差は、250μm以下であり、及び平均体積気孔率は、40~80%である、請求項2に記載のデバイス。
- 前記第1の構成要素は、0.1~40GPaの弾性率を有する、請求項1~3のいずれか一項に記載のデバイス。
- 27MPa以下の引張力に耐えることができる、請求項1~3のいずれか一項に記載のデバイス。
- 前記第2の構成要素は、多孔質ではない、請求項1~3のいずれか一項に記載のデバイス。
- 前記第2の構成要素は、多孔質ではなく、且つ、前記デバイスは、体温未満の温度で第1の形状を有し、且つ体温まで加熱されると第2の形状に自発的に変化する、請求項2に記載のデバイス。
- 前記第1の構成要素は、体温未満の温度で第1の形状を有し、且つ体温まで加熱されると第2の形状に自発的に変化する、請求項7に記載のデバイス。
- ニッケル粉末とチタン粉末とを含む混合物を燃焼合成(CS)又は自己伝播型高温合成(SHS)によって反応させることを含む、請求項1に記載のデバイスを調製する方法。
- 前記混合物は、ナノ結晶NiTi、タンタル、ニオブ、マグネシウム、コバルト、クロム、鉄及びモリブデンの1つ以上を含む、請求項9に記載の方法。
- 前記混合物は、塩化ナトリウム、炭酸水素アンモニウム又は尿素の1つ以上を含む、請求項9に記載の方法。
- 哺乳動物の体を修正する方法であって、請求項1に記載のデバイスを前記体内に植え込むことを含む方法。
- 前記第1の構成要素は、海綿骨に隣接して植え込まれ、且つ0.8~1.2GPaの弾性率を有する、請求項12に記載の方法。
- 液体を濾過する方法であって、請求項1に記載のデバイスの前記第1の構成要素を通して前記液体を通過させることを含む方法。
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CA3064394A1 (en) * | 2018-12-07 | 2020-06-07 | Smed-Ta/Td, Llc | Patellofemoral implant with porous ingrowth material and method of manufacturing the same |
US20220249220A1 (en) * | 2019-07-09 | 2022-08-11 | Acumed Llc | Modified trabecular metal suture anchor implant |
US12090056B2 (en) * | 2019-08-01 | 2024-09-17 | Howmedica Osteonics Corp. | Multi-stage additive manufacturing process with inserts |
WO2021113999A1 (es) * | 2019-12-13 | 2021-06-17 | Universidad Técnica Federico Santa María | Espuma de aleación en base a titanio; método de preparación de dicha aleación; y su uso como biomaterial |
CN112060574B (zh) * | 2020-07-21 | 2022-03-29 | 陈勃生 | 一种生物复合材料三维植入物的增材制造方法 |
WO2022059497A1 (ja) * | 2020-09-17 | 2022-03-24 | 富山住友電工株式会社 | ニッケルクロム多孔体およびニッケルクロム多孔体の製造方法 |
US12083018B2 (en) | 2020-09-18 | 2024-09-10 | Globus Medical, Inc. | Hip arthroplasty implants |
US12053383B2 (en) | 2020-09-18 | 2024-08-06 | Globus Medical Inc. | Hip arthroplasty implants |
US12064156B2 (en) | 2023-01-09 | 2024-08-20 | John F. Krumme | Dynamic compression fixation devices |
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