JPH0363898B2 - - Google Patents

Info

Publication number
JPH0363898B2
JPH0363898B2 JP62295811A JP29581187A JPH0363898B2 JP H0363898 B2 JPH0363898 B2 JP H0363898B2 JP 62295811 A JP62295811 A JP 62295811A JP 29581187 A JP29581187 A JP 29581187A JP H0363898 B2 JPH0363898 B2 JP H0363898B2
Authority
JP
Japan
Prior art keywords
intervertebral disc
artificial intervertebral
synthetic polymer
end body
disc according
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
JP62295811A
Other languages
English (en)
Other versions
JPH01136655A (ja
Inventor
Yasuhiko Hirayama
Akiko Igata
Satoshi Kojima
Hiromi Matsuzaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo Co Ltd
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 Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Priority to JP62295811A priority Critical patent/JPH01136655A/ja
Priority to US07/274,960 priority patent/US4946378A/en
Priority to DE8888119477T priority patent/DE3869340D1/de
Priority to EP88119477A priority patent/EP0317972B1/en
Publication of JPH01136655A publication Critical patent/JPH01136655A/ja
Publication of JPH0363898B2 publication Critical patent/JPH0363898B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • 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
    • 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
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30138—Convex polygonal shapes
    • A61F2002/30153—Convex polygonal shapes rectangular
    • 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
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30159—Concave polygonal shapes
    • A61F2002/30164—Concave polygonal shapes dovetail-shaped
    • 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
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/30199—Three-dimensional shapes
    • A61F2002/30261—Three-dimensional shapes parallelepipedal
    • 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
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30405—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves
    • 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
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30563—Special structural features of bone or joint prostheses not otherwise provided for having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30879—Ribs
    • A61F2002/30883—Ribs dovetail-shaped
    • 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
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0017—Angular shapes
    • A61F2230/0019—Angular shapes rectangular
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0028—Shapes in the form of latin or greek characters
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0082—Three-dimensional shapes parallelepipedal
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00017—Iron- or Fe-based alloys, e.g. stainless steel
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00389—The prosthesis being coated or covered with a particular material
    • A61F2310/00592—Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • A61F2310/00796—Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S606/00—Surgery
    • Y10S606/907—Composed of particular material or coated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S606/00—Surgery
    • Y10S606/907—Composed of particular material or coated
    • Y10S606/91—Polymer

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Vascular Medicine (AREA)
  • Transplantation (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Cardiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Neurology (AREA)
  • Prostheses (AREA)

Description

【発明の詳細な説明】 「技術分野」 本発明は、椎間板ヘルニア、頚髄症などを外科
的に治療する場合に、椎間板の切除部に移植され
る人工椎間板（可動式椎体スペーサ）に関する。
「従来技術およびその問題点」 椎間板ヘルニアは、椎間板の退行変性によつて
中央の髄核が逸出して脊髄神経を圧迫し、激痛を
起こすことで良く知られている。最も一般的に
は、腰部椎間板ヘルニアが知られているが、頚部
の椎間板ヘルニアも転落、交通事故等、外傷によ
つて起こり、また日中あるいは夜間突然発症する
こともある。
椎間板ヘルニアは、軽い症状であれば、固定す
ることにより治療可能であるが、重い症状の場合
には、手術治療を行なう。従来の手術は、病変椎
間板を切除した上で、上下の椎体の間に骨移植を
行なう。骨移植には、患者自信の腸骨の一部を移
植するか、またはアルミナ、アパタイト等の人工
骨を移植する方法がある。しかしながら、これら
の方法では、いずれにしても、本来可動性である
椎体が完全に固定されてしまう。このため上下椎
間板に異常可動性が生じる。
したがつて、椎体の間で可動な移植物の開発が
望まれている。
「発明の目的」 本発明は、上記従来技術の欠点を解消し、椎体
の間に容易に移植でき、移植後に椎体の動きを可
能ならしめ、異和感を与えず、生体親和性の人工
椎間板を提供することを目的とする。
「発明の概要」 本発明の人工椎間板は、一体の端部体の間に、
ゴム弾性を有する医療用合成高分子中間部材が結
合部材を介して挟持され、この結合部材は、端部
体に当接する突起と、医療用合成高分子中間部材
中に埋設された埋込部とを含み、当該の各埋込部
を各突起より大径にすることにより、圧縮力及び
引張力がかかつたときに前記結合部材を通して抵
抗及び弾性が生じるように前記結合部材が前記医
療用合成高分子中間部材に結合されていることを
特徴とする。
本発明の人工椎間板は、強度を持たせるため、
端部材は金属材料から作成するが、これを生体親
和性とするために、その表面にアパタイト層を設
ける。このアパタイト層は例えば溶射によつて設
けることができる。このためアパタイトと金属と
が同等の熱膨張率を有することが望ましく、その
ような金属としてチタンを用いることが好まし
い。
そしてこの端部体は、椎体に適切に嵌合し、か
つ外れないように、突出部を有することが望まし
く、また端部体と医療溶合成高分子中間部材とを
結合する結合部材は圧縮力及び引張力がかかつた
ときに本結合部材を通して抵抗及び弾性が生じる
ように、結合部材の医療用合成高分子中間部材中
への埋込部を端部体に当接する突起より大径にす
ることが望ましい。
本発明において、ゴム弾性を有する医療用合成
高分子は、生体親和性を有するゴムであればよ
く、例えばシリコーンゴム、ポリビニルアルコー
ル、ポリウレタン等を使用することができる。な
お医療用合成高分子とは、化学的に不活性で、血
液や液体などの生体内組織液によつて変性を受け
ない、周囲に炎症や異物反応などの生体反応を起
こさない、発がん性がない、アレルギー反応を起
こさない、生体内に長期間に渡りさらされても、
引張力強さや弾性などの機械的能力を失わない、
煮沸、薬液、あるいはガス滅菌などの消毒により
編成しない、加工や造型が容易である、廉価であ
る、等の特徴を有するものである（『高分子辞
典』、高分子学会高分子辞典編集委員会編集、浅
倉書店発行）。
端部体と合成高分子中間部材を結合する結合部
材は、チタン、ステンレス鋼等、適当な強度を有
する任意の材料から形成することができる。
「発明の実施例」 以下図示実施例について本発明を説明する。本
発明の人工椎間板は、一対の端部体１の間に、結
合部材２によつてガム弾性を有する医療用合成高
分子３を挟持してなり、端部体１の外表面にはア
パタイト層４が設けられている。
チタンからなる端部体１は、偏平な直方体状を
なしていて、その中心に外方に向かう逆円錐体状
の突起１ａを有している。この突起１ａは、手術
によつて、隣り合う椎体に対向させて形成した孔
内に埋め込まれる。逆円錐体の突起１ａは、椎体
から外れるのを防止するために効果的である。
チタンまたはステンレス鋼からなる結合部材２
は、端部体１よりやや小さい偏平直方体状の埋込
部２ａと、この埋込部２ａの中心部に設けられ、
端部体１に当接する円柱状突起２ｂと、この円柱
状突起２ｂに設けられ、端部体１に螺合されるね
じ２ｃを有している。
この人工椎間板の端部体１の外表面に設けるア
パタイト層４は、例えば溶射によつて形成され
る。アパタイト層４の厚さは、一般に0.1〜0.5mm
である。
結合部材２とねじ２ｃによつて結合された一対
の端部材１は、適切な間隔を置いて対向して型内
に設置される。そしてその間に合成ゴムラテツク
スを流し込み、常法により硬化させると、内部に
結合部材２を埋め込んだ医療用合成高分子中間部
材３が形成され、本人工椎間板が得られる。医療
用合成高分子中間部材３は、結合部材２の埋込部
２ａと端部体１との間に進入し、埋込部２ａは、
端部体１とほぼ相似形で、これより僅かに小さい
だけなので、端部体１と強固に結合され、椎間板
に埋め込まれた後も剥離するおそれがない。
本発明の人工椎間板の可動性は、合成高分子の
柔軟性を利用するので、医療用合成高分子３はあ
る程度の厚さを必要とする。スペーサ全体の大き
さ結合部材２の大きさによつても左右されるが、
一般にこの合成高分子中間部材３を５〜35mm、好
ましくは、10〜30mmの厚さとするのがよい。
なお端部材１および結合部材２の形状は、種々
変形が可能であり、図示した形状に限定されるも
のではない。
「発明の効果」 本発明による人工椎間板は、柔軟性を有する医
療用合成高分子中間部材が端部体の間に挟まれて
いるので、椎体の動きに適合して弾性変形する。
したがつて本発明の人工椎間板を移植した脊髄部
分は固定されず、運動性を有し、健常な椎体に影
響を及ぼさない。この人工椎板は、特に頚部に移
植した場合に好適であり、患者は異和感を感じる
ことなく首を動かすことができる。さらに本発明
の人工椎間板は、端部体の外表面にアパタイト層
を設けて生体親和性とし、ゴム成形体として医療
用合成高分子を用いているので、生体組織に害を
及ぼさない。
【図面の簡単な説明】
図は本発明の人工椎間板の実施例を示すもの
で、第１図は第２図の−線に沿う断面図、第
２図は平面図である。 １……端部体、２……結合部材、３……医療用
合成高分子、４……アパタイト層。

Claims (1)

  1. 【特許請求の範囲】 １ 一対の端部体の間に、ゴム弾性を有する医用
    合成高分子中間部材が結合部材を介して挟持さ
    れ、前記結合部材は、端部体に当節する突起と、
    前記医療用合成高分子中間部材中に埋設された埋
    込部とを含み、前記の各埋込部を前記の各突起よ
    り大径にすることにより、圧縮力及び引張力がか
    かつたときに前記結合部材を通して抵抗及び弾性
    が生じるように前記結合部材が前記医療用合成高
    分子中間部材に結合されていることを特徴とする
    人工椎間板。 ２ 特許請求の範囲第１項において、端部体は外
    側表面にアパタイト層を有する人工椎間板。 ３ 特許請求の範囲第１項または第２項におい
    て、端部体はチタンからなつている人工椎間板。 ４ 特許請求の範囲第１項ないし第３項のいずれ
    か一において、結合部材がチタンまたはステンレ
    ス鋼からなり、端部体にねじ結合されている人工
    椎間板。 ５ 特許請求の範囲第１項ないし第４項のいずれ
    か一において、端部体は椎体と係合する突出部を
    有する人工椎間板 ６ 特許請求の範囲第１項ないし第５項のいずれ
    か一において、医療用合成高分子がシリコーンゴ
    ム、ポリビニルアルコール、ポリウレタンから選
    択されたものである人工椎間板。
JP62295811A 1987-11-24 1987-11-24 人工椎間板 Granted JPH01136655A (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP62295811A JPH01136655A (ja) 1987-11-24 1987-11-24 人工椎間板
US07/274,960 US4946378A (en) 1987-11-24 1988-11-22 Artificial intervertebral disc
DE8888119477T DE3869340D1 (de) 1987-11-24 1988-11-23 Kuenstliche zwischenwirbelscheibe.
EP88119477A EP0317972B1 (en) 1987-11-24 1988-11-23 Artificial intervertebral disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62295811A JPH01136655A (ja) 1987-11-24 1987-11-24 人工椎間板

Publications (2)

Publication Number Publication Date
JPH01136655A JPH01136655A (ja) 1989-05-29
JPH0363898B2 true JPH0363898B2 (ja) 1991-10-03

Family

ID=17825472

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62295811A Granted JPH01136655A (ja) 1987-11-24 1987-11-24 人工椎間板

Country Status (4)

Country Link
US (1) US4946378A (ja)
EP (1) EP0317972B1 (ja)
JP (1) JPH01136655A (ja)
DE (1) DE3869340D1 (ja)

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Also Published As

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US4946378A (en) 1990-08-07
JPH01136655A (ja) 1989-05-29
DE3869340D1 (de) 1992-04-23
EP0317972A1 (en) 1989-05-31
EP0317972B1 (en) 1992-03-18

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