JP3691073B2 - 骨板 - Google Patents

骨板 Download PDF

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JP3691073B2
JP3691073B2 JP51078997A JP51078997A JP3691073B2 JP 3691073 B2 JP3691073 B2 JP 3691073B2 JP 51078997 A JP51078997 A JP 51078997A JP 51078997 A JP51078997 A JP 51078997A JP 3691073 B2 JP3691073 B2 JP 3691073B2
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bone
bone plate
plate
screw
hardness
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JPH11512004A (ja
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ロベルト フリック
ロベルト スチャファン
マルクス ハーリ
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AO Technology AG
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Synthes AG Chur
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8052—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
    • A61B17/8057—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded the interlocking form comprising a thread
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8052—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/866—Material or manufacture
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/04—Macromolecular materials
    • A61L31/06—Macromolecular materials obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/12—Composite materials, i.e. containing one material dispersed in a matrix of the same or different material
    • A61L31/125—Composite materials, i.e. containing one material dispersed in a matrix of the same or different material having a macromolecular matrix
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2430/00—Materials or treatment for tissue regeneration
    • A61L2430/02—Materials or treatment for tissue regeneration for reconstruction of bones; weight-bearing implants

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Public Health (AREA)
  • Animal Behavior & Ethology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Veterinary Medicine (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Neurology (AREA)
  • Molecular Biology (AREA)
  • Chemical & Material Sciences (AREA)
  • Vascular Medicine (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Medical Informatics (AREA)
  • Epidemiology (AREA)
  • Biomedical Technology (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Surgical Instruments (AREA)
  • Prostheses (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Materials For Photolithography (AREA)

Description

本発明は請求項１の前文に特定された型の骨板に関する。
この一般的な型の骨板は欧州特許出願A 0,530,585明細書により知られている。円錐ヘッド構造を有する骨スクリューを使用する円錐板孔による骨板の永久固定は、スクリューヘッドと板孔の間の達成可能な形状ロッキング、即ち、確実なロッキングに依存し、このようなロッキングは小さいサイズを取り扱う時に最も問題がある。
本発明の目的はこのような骨板を固定するのに使用される骨スクリューを使用して最適の形状ロッキングを確実にする上記の種の骨板を提供することである。
本発明は請求項１の特徴を明らかに示す骨板によりこの問題を解決する。
本発明の更に有利な実施例が従属の請求項に特徴付けられている。
本発明により与えられる利点は、実質的には、骨板を固定するのに利用できるスクリューヘッドの表面構造の本発明の設計のために、この板による優れた形状ロッキングが達成されることである。
本発明及び本発明の更なる実施例が幾つかの例示実施例の部分略図に関して以下に説明される。
図１は本発明の骨板の長さ方向の断面である。
図２は図１の骨板を固定するための骨スクリューの斜視図である。
図３は図１の骨板の上表面の部分斜視図である。
図１〜３に示された骨板１は幾つかの板孔３を含み、夫々の孔はそれが骨接触表面２に向かって先細になり、骨スクリュー４を受け取るような形状にされている。骨スクリュー４は、これらのスクリューを円錐板孔３（これらに、それらのスクリューが適合されている）に挿入するための側部表面構造または表面組織７を有する円錐ヘッド５で形成され、そしてまた骨に固定するためのネジ山６で形成される。
夫々の骨スクリュー４のヘッド５の側部表面構造７は骨板１中の板孔３付近の材料より大きな硬度を有する。その結果として、骨スクリュー４が板孔３に軸がずれて挿入される場合でさえも、最適の形状ロッキングが達成される。何となれば、一層硬質の側部表面構造７は板孔３の一層軟質の材料にくい込むことができるからである。
側部表面構造７の硬度は230〜450HV（ビッカース硬度）の範囲で選ばれることが有利であり、250〜350HVで選ばれることが好ましい。骨板１に適した材料は100〜220、好ましくは120〜200HVの硬度を有する金属である。有利には、側部表面構造７の硬度は、好ましくはその板孔３の付近で、骨板１の硬度の少なくとも２倍である。
側部表面構造７は、例えば、円周リブの形態で、骨スクリュー４の長さ方向の軸に対し横の構造にされることが好ましい。この特徴が形状ロッキングを改良する。
図２に示されるような本発明の好ましい実施態様において、骨スクリュー４のヘッド５の側部表面７はネジ山９またはらせん構造を有することである。
図３に示されるように、板孔３はまたネジ山８を有していてもよい。有利には、二つのネジ山８及び９は互いに適合するであろう。有利には、このような組み合わせにおいて、骨スクリュー４のヘッド５のネジ山９は板孔３のネジ山８にかみ合う二つ以上の回転を有するであろう。
その上部自由端部で、夫々の骨スクリューのヘッド５は六角ソケットレンチを受け取る六角くぼみ10を含む。
骨板１より硬質である材料から骨スクリュー４のヘッド５を完全につくることに代えて、ヘッドはまた板孔３の付近で骨板１より大きい硬度を有する被覆物で覆われてもよい。この被覆物は500〜10,000HVの表面硬度を有すればよく、好ましくは1,000〜5,000HVである。
骨板１はプラスチック製であることが好ましく、骨スクリュー４は金属またはセラミック製であることが好ましい。特に、下記の型のプラスチック（強化または未強化を問わない）が骨板に適している。
40〜70％の破断伸び及び3,000〜6,000N/mm2のヤング率を有するポリアクリルエーテルケトン（PEAK）またはポリエーテルエーテルケトン（PEEK）；
80〜120％の破断伸び及び2,000〜3,500N/mm2のヤング率を有するポリスルホン；
1.5〜2.5％の破断伸び及び5,000〜20,000N/mm2のヤング率を有する液晶ポリマー（LCP）；
10〜50％の破断伸び及び2,00〜3,500N/mm2のヤング率を有するポリオキシメチレン（POM）；
0.2〜1.0％の破断伸び及び12,000〜20,000N/mm2のヤング率を有するポリフェニレンサルファイド（PPS）。
プラスチックは金属繊維、プラスチック繊維または炭素繊維をプラスチックマトリックスに埋め込むことにより強化されてもよい。

Claims (18)

  1. 骨接触表面２に向かって先細になっている複数の円錐板孔３と、骨板１を骨に固定するための少なくとも二つの骨スクリュー４とを有する骨板１であって、夫々の前記スクリューが側部表面組織７を有する円錐ヘッド５を有し、前記ヘッドが板孔３に適合するような形状にされ、かつ前記孔への挿入に使用され、骨スクリュー４が骨への固定のための細いネジ６を更に含む骨板１であって、
    Ａ）前記側部表面構造７が板孔３の付近に配置される骨板１の材料よりも大きい硬度を有し、
    Ｂ）前記側部表面構造７の硬度が、その板孔３の付近で、骨板１の硬度の少なくとも２倍であり、これにより骨スクリュー４が板孔３に軸がずれて挿入されても、円錐ヘッド５のより硬い側部表面構造７により各板孔３のくい込みにより、各骨スクリューと板孔の間で形状ロッキングが達成される
    ことを特徴とする骨板１。
  2. 前記側部表面構造７の硬度が230〜450HVであることを特徴とする請求項１に記載の骨板１。
  3. 骨板１が100〜220HVの硬度を有する金属からなることを特徴とする請求項１または請求項２に記載の骨板１。
  4. 骨スクリュー４のヘッド５の前記側部表面７がスレッド９またはらせん構造とフィットされていることを特徴とする請求項１ないし請求項３のいずれかに記載の骨板１。
  5. 板孔３がネジ山８を有することを特徴とする請求項１ないし請求項４のいずれかに記載の骨板１。
  6. 骨スクリュー４のヘッド５が、その板孔３の付近で、骨板１より高い硬度の被覆物とフィットされていることを特徴とする請求項１ないし請求項５のいずれかに記載の骨板１。
  7. 被覆物が500〜10,000HVの表面硬度を示す請求項６に記載の骨板１。
  8. 被覆物が1,000〜5,000HVの表面硬度を示す請求項７に記載の骨板１。
  9. 骨スクリュー４のヘッド５の前記側部外表面構造７及び板孔３が相互に適合するネジ山８、９を示す請求項５ないし請求項８のいずれかに記載の骨板１。
  10. 骨スクリュー４のヘッド５のネジ山９が板孔３のネジ山８に対し一つ以上のネジ山を含むことを特徴とする請求項５ないし請求項８のいずれかに記載の骨板１。
  11. 前記側部表面構造７が骨スクリュー４の長さ方向の軸に対し横に走っている構造である円周リブを含むことを特徴とする請求項１ないし請求項１０のいずれかに記載の骨板１。
  12. 骨板１がプラスチック製であり、かつ骨スクリュー４が金属またはセラミック製であることを特徴とする請求項１ないし請求項１１のいずれかに記載の骨板１。
  13. 骨板１が40〜70％の破断伸び及び3,000〜6,000N/mm2のヤング率を有するポリアクリルエーテルケトンまたはポリエーテルエーテルケトン製であることを特徴とする請求項１ないし請求項１２のいずれかに記載の骨板１。
  14. 骨板１が80〜120％の破断伸び及び2,000〜3,500N/mm2のヤング率を有するポリサルホン製であることを特徴とする請求項１ないし請求項１２のいずれかに記載の骨板１。
  15. 骨板１が1.5〜2.5％の破断伸び及び5,000〜20,000N/mm2のヤング率を有する液晶ポリマー製であることを特徴とする請求項１ないし請求項１２のいずれかに記載の骨板１。
  16. 骨板１が10〜50％の破断伸び及び2,000〜3,500N/mm2のヤング率を有するポリオキシメチレン製であることを特徴とする請求項１ないし請求項１２のいずれかに記載の骨板１。
  17. 骨板１が0.2〜1.0％の破断伸び及び12,000〜20,000N/mm2のヤング率を有するポリフェニレンサルファイド製であることを特徴とする請求項１ないし請求項１２のいずれかに記載の骨板１。
  18. 骨板１が金属繊維、プラスチック繊維または炭素繊維で強化されたプラスチック製であることを特徴とする請求項１ないし請求項１７のいずれかに記載の骨板１。
JP51078997A 1995-09-06 1995-09-06 骨板 Expired - Lifetime JP3691073B2 (ja)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1995/003494 WO1997009000A1 (de) 1995-09-06 1995-09-06 Knochenplatte

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JPH11512004A JPH11512004A (ja) 1999-10-19
JP3691073B2 true JP3691073B2 (ja) 2005-08-31

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US (1) US6206881B1 (ja)
EP (1) EP0848600B1 (ja)
JP (1) JP3691073B2 (ja)
KR (1) KR100424088B1 (ja)
AT (1) ATE200970T1 (ja)
CA (1) CA2230058C (ja)
DE (1) DE59509247D1 (ja)
ES (1) ES2158127T3 (ja)
MY (1) MY132315A (ja)
WO (1) WO1997009000A1 (ja)

Cited By (1)

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JP2013500084A (ja) * 2009-07-24 2013-01-07 ウォーソー・オーソペディック・インコーポレーテッド 締まりばめ締結具を用いるインプラント

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EP0848600B1 (de) 2001-05-09
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CA2230058A1 (en) 1997-03-13
CA2230058C (en) 2005-03-29
KR19990044390A (ko) 1999-06-25
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JPH11512004A (ja) 1999-10-19
WO1997009000A1 (de) 1997-03-13
US6206881B1 (en) 2001-03-27
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KR100424088B1 (ko) 2004-08-04
EP0848600A1 (de) 1998-06-24

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