JPH066810Y2 - 椎体固定用プレート - Google Patents

椎体固定用プレート

Info

Publication number
JPH066810Y2
JPH066810Y2 JP1989138193U JP13819389U JPH066810Y2 JP H066810 Y2 JPH066810 Y2 JP H066810Y2 JP 1989138193 U JP1989138193 U JP 1989138193U JP 13819389 U JP13819389 U JP 13819389U JP H066810 Y2 JPH066810 Y2 JP H066810Y2
Authority
JP
Japan
Prior art keywords
vertebral body
screw
fixing
fixing plate
plate
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 - Lifetime
Application number
JP1989138193U
Other languages
English (en)
Other versions
JPH0375717U (ja
Inventor
聡 小島
浩巳 松▲崎▼
Original Assignee
旭光学工業株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 旭光学工業株式会社 filed Critical 旭光学工業株式会社
Priority to JP1989138193U priority Critical patent/JPH066810Y2/ja
Priority to US07/619,492 priority patent/US5147361A/en
Priority to DE4038082A priority patent/DE4038082C2/de
Publication of JPH0375717U publication Critical patent/JPH0375717U/ja
Application granted granted Critical
Publication of JPH066810Y2 publication Critical patent/JPH066810Y2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • 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 or setting implements
    • 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
    • A61B17/809—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates with bone-penetrating elements, e.g. blades or prongs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • 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 or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
    • A61B17/7059—Cortical plates
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • 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 or setting implements
    • 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
    • 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 or setting implements
    • 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
    • A61B17/8625—Shanks, i.e. parts contacting bone tissue

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Neurology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Surgical Instruments (AREA)

Description

【考案の詳細な説明】 「技術分野」 本考案は、上下の椎体、特に脊椎椎体を固定する際に用
いる椎体固定用プレートに関する。
「従来技術およびその問題点」 例えば胸−腰椎体の一つが損傷した場合、その損傷椎体
を除去した後、損傷椎体の代わりに移植骨または人工骨
を挿入し、その上下の椎体間を、何らかの椎体固定器具
で機械的に固定する手術が行なわれる。このため従来、
椎体固定器具が使用されてきた。このような椎体固定器
具として必要な条件は、薄いこと、固定器具と椎体
を固定するスクリューが緩まないこと、椎体に固定器
具が密着すること、および手術が簡単であることがあ
げられる。
ところで従来の椎体固定器具として、接続すべき上下の
椎体にまず椎体プレートを打ち込むとともにねじ固定
し、次にこの椎体プレート間を別の複数の固定ねじおよ
びナットで固定するものが知られている。この椎体固定
器具は、上記〜の条件については優れている。しか
し、の手術の簡単さという点では、若干問題があっ
た。つまり固定ねじをナットを用いて椎体プレートの側
面から固定するには、小型のスパナを繰り返しナットに
着脱させるという時間のかかる作業を必要とする。さら
に固定ねじは、ねじりに対する抵抗力が弱いため、これ
を通常２本用い、その２本の固定ねじ間を別のねじれ防
止器具で接続しなければならない。接続作業に時間を要
することは、明らかに術者および患者の苦痛を増加させ
る。
「考案の目的」 本考案は、このような従来の椎体固定器具についての問
題意識に基づき、より簡単な作業で上下の椎体間の接続
ができる椎体固定用プレートを得ることを目的とする。
また本考案は、椎体との固定強度およびねじりに対する
強度がともに強い椎体固定用プレートを得ることを目的
とする。
「考案の概要」 本考案は、一連の板状体からなる固定プレートの両端部
に、それぞれ椎体への固定部を設け、この椎体固定部に
それぞれねじ孔を形成し、このねじ孔に挿入する固定ね
じに、該ねじ孔に螺合する螺合ねじ部と、椎体内に進入
する進入ねじ部とを設け、かつこの進入ねじ部のねじピ
ッチP1を螺合ねじ部のねじピッチP2より大きく(P1＞P2)
としたことを特徴としている。
このようにねじピッチを設定すると、固定ねじの進入ね
じ部が椎体に螺合し、かつ螺合ねじ部が固定プレートの
ねじ孔に螺合した状態において、該固定ねじを回動させ
ると、進入ねじ部の進行量の方が螺合ねじ部の進行量よ
り多くなり、その結果、固定プレートが強固に椎体に固
定される。また板状の固定プレートは、ねじりに強い。
「考案の実施例」 以下図示実施例について本考案を説明する。第１Ａ〜１
Ｃ図は本考案による固定プレート１０を示し、第２Ａ〜
２Ｃ図は固定ねじ２０を示す。
固定プレート１０は、全体として平板状をしており、そ
の両端部に、コーナ部を円弧とした略矩形の椎体固定部
１１を有する。この椎体固定部１１には、その裏面に厚
肉部１２が一体に形成されており、この厚肉部１２に、
先端の尖った固定突起１３が突出形成されている。
椎体固定部１１にはそれぞれ、略矩形状の椎体固定部１
１の対角線方向に離隔した一対のねじ孔１４，１５が形
成されている。この一対のねじ孔１４，１５はそれぞ
れ、第１Ｂ、１Ｄ図に示すように、椎体固定部１１の平
面方向と直交する方向に対し、椎体固定部１１の内側に
向けて傾斜（この実施例では約10゜）している。そして
このねじ孔１４とねじ孔１５のねじピッチはP2であり、
例えば1.5mm(p1.5)のピッチが設定される。
固定ねじ２０は、頭部の大径の螺合ねじ部２１と、これ
に続く小径の進入ねじ部２２とを有する。螺合ねじ部２
１はねじ孔１４，１５に螺合されるもので、従ってその
ねじピッチP2は、ねじ孔１４，１５と同じであり、上述
の例に従って、例えば1.5mm(p1.5)に形成されている。
これに対し、進入ねじ部２２は、このピッチP2より大き
いねじピッチP1(P1＞P2)に形成されている。このピッチ
P1は例えば、1.75mm(p1.75)に設定される。またこの進
入ねじ部２２は、第２Ｂ図に示すように、引き抜きに強
い形状をした医療用ねじとして形成されている。なお螺
合ねじ部２１の端部には、第２Ｃ図に示すように六角レ
ンチの挿入孔２３が形成されている。
なお固定プレート１０および固定ねじ２０は、例えばチ
タン系合金から構成することができ、さらに必要に応
じ、その表面にアパタイト等の生体親和性の材料をコー
ティングすることができる。
上記構成の本椎体固定用プレートは、第３図に示すよう
に用いられる。損傷した脊椎椎体の部位に、移植骨（ま
たは人工骨）３０を挿入し、この移植骨３０の上下の脊
椎椎体３１に、それぞれ固定プレート１０の椎体固定部
１１を合致させる。この状態において、椎体固定部１１
を軽く叩いてその固定突起１３を脊椎椎体３１に進入さ
せ、仮止めすることができる。次に、ねじ孔１４とねじ
孔１５にそれぞれ固定ねじ２０を進入させ、レンチ挿入
孔２３に挿入した六角レンチによりねじ込み方向に回転
させる。すると進入ねじ部２２が脊椎椎体３１内に進入
し、やがて螺合ねじ部２１がねじ孔１４，１５に螺合す
る。この状態において、さらに固定ねじ２０をねじ込み
方向に回転させると、螺合ねじ部２１と進入ねじ部２２
のピッチの差により、固定ねじ２０の単位回転角当たり
の進入ねじ部２２の進行量の方が、螺合ねじ部２１のそ
れより大きくなる。このため、固定プレート１０が強固
に脊椎椎体３１に結合される。
ねじ孔１４と１５の傾斜は、脊椎椎体３１内に位置する
神経束３２に固定ねじ２０が干渉しないようにするため
に設定されたものである。従って、このねじ孔１４と１
５の傾斜は、固定プレート１０および椎体固定部１１の
形状、該ねじ孔１４，１５の位置等の要素に応じ、適宜
設定することができる。
以上の作業は、固定ねじ２０をその頭部のレンチ挿入孔
２３に嵌めた六角レンチによって回転させることによっ
て行なうことができるから、非常に作業性がよく、短時
間で行なうことができる。また平板状の固定プレート１
０は、ねじりに強い断面形状であるから、固定プレート
１０がねじれ変形するおそれは皆無である。
「考案の効果」 以上のように本考案の椎体固定用プレートは、両端に椎
体固定部を有する固定プレートと、この椎体固定部に形
成したねじ孔に螺合させる固定ねじとからなるものであ
って、固定ねじには、ピッチが大小に異なる進入ねじ部
と螺合ねじ部が形成されており、進入ねじ部が椎体内
に、螺合ねじ部が固定プレートのねじ孔にそれぞれ螺合
されるものであるから、ピッチの違いにより、固定プレ
ートを強固に椎体に固定することができる。またその固
定作業は、固定ねじをその頭部を介して回動させて行な
うことができるから、非常に作業性がよく、従って手術
を簡単にすることができる。さらに請求項２に記載の椎
体固定用プレートによれば、固定ねじが椎体内の神経を
損傷するおそれをなくすことができる。
【図面の簡単な説明】
第１Ａ〜１Ｄ図は本考案の椎体固定用プレートの固定プ
レートを示すもので、第１Ａ図は平面図、第１Ｂ、１Ｄ
図はそれぞれ第１Ａ図のＢ−Ｂ線、Ｄ−Ｄ線に沿う断面
図、第１Ｃ図は第１Ａ図のＣ−Ｃ線に沿う断面を含む正
面図である。 第２Ａ〜２Ｃ図は固定ねじを示すもので、第２Ａ図は平
面図、第２Ｂ図は、第２Ａ図の上面図、第２Ｃ図は進入
ねじ部の拡大図、 第３図は本考案の椎体固定用プレートの使用態様を示す
正面図である。 １０……固定プレート、１１……椎体固定部、１２……
厚肉部、１３……固定突起、１４，１５……ねじ孔、２
０……固定ねじ、２１……螺合ねじ部、２２……進入ね
じ部、２３……レンチ挿入孔、３０……移植骨、３１…
…脊椎椎体、３２……神経束。

Claims (2)

    【実用新案登録請求の範囲】
  1. 【請求項１】固定プレートの両端部に、それぞれ椎体へ
    の固定部を設け、 この椎体固定部にそれぞれねじ孔を形成し、 このねじ孔に挿入する固定ねじに、該ねじ孔に螺合する
    螺合ねじ部と、椎体内に進入する進入ねじ部とを設け、
    かつこの進入ねじ部のねじピッチ(P1)を螺合ねじ部のね
    じピッチ(P2)より大きく(P1＞P2)したことを特徴とする
    椎体固定用プレート。
  2. 【請求項２】請求項１において、固定プレートのねじ孔
    は、固定ねじが椎体内の神経束位置を避けるべく、固定
    プレートの平面方向と直交する方向に対して傾斜してい
    る椎体固定用プレート。
JP1989138193U 1989-11-29 1989-11-29 椎体固定用プレート Expired - Lifetime JPH066810Y2 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP1989138193U JPH066810Y2 (ja) 1989-11-29 1989-11-29 椎体固定用プレート
US07/619,492 US5147361A (en) 1989-11-29 1990-11-29 Vertebral connecting plate
DE4038082A DE4038082C2 (de) 1989-11-29 1990-11-29 Wirbelverbindungsanordnung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1989138193U JPH066810Y2 (ja) 1989-11-29 1989-11-29 椎体固定用プレート

Publications (2)

Publication Number Publication Date
JPH0375717U JPH0375717U (ja) 1991-07-30
JPH066810Y2 true JPH066810Y2 (ja) 1994-02-23

Family

ID=15216256

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1989138193U Expired - Lifetime JPH066810Y2 (ja) 1989-11-29 1989-11-29 椎体固定用プレート

Country Status (3)

Country Link
US (1) US5147361A (ja)
JP (1) JPH066810Y2 (ja)
DE (1) DE4038082C2 (ja)

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DE4038082C2 (de) 1993-11-11
US5147361A (en) 1992-09-15
JPH0375717U (ja) 1991-07-30
DE4038082A1 (de) 1991-06-06

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