JP2587625B2 - Hip prosthesis - Google Patents

Hip prosthesis

Info

Publication number
JP2587625B2
JP2587625B2 JP61311187A JP31118786A JP2587625B2 JP 2587625 B2 JP2587625 B2 JP 2587625B2 JP 61311187 A JP61311187 A JP 61311187A JP 31118786 A JP31118786 A JP 31118786A JP 2587625 B2 JP2587625 B2 JP 2587625B2
Authority
JP
Japan
Prior art keywords
porous body
joint
ceramic
hip joint
artificial hip
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
JP61311187A
Other languages
Japanese (ja)
Other versions
JPS63164947A (en
Inventor
明 照井
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.)
Kyocera Corp
Original Assignee
Kyocera Corp
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 Kyocera Corp filed Critical Kyocera Corp
Priority to JP61311187A priority Critical patent/JP2587625B2/en
Publication of JPS63164947A publication Critical patent/JPS63164947A/en
Application granted granted Critical
Publication of JP2587625B2 publication Critical patent/JP2587625B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • 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

Landscapes

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

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は高潤滑特性を有する人工股関節に関するもの
である。Description: TECHNICAL FIELD The present invention relates to an artificial hip joint having high lubrication characteristics.

〔従来技術及びその問題点〕[Prior art and its problems]

人工股関節は、リューマチや変形性関節症等の病変
や、障害などによって損なわれた関節機能を早期に回復
させる手段として有効かつ重要な役割を果している。19
61年チャンレー氏が現用されているステンレス鋼製ステ
ムと高密度ポリエチレン（HDP）製臼蓋ソケットの組合
せから成る人工股関節を実用化して以来、人工股関節を
成す摺動面の構成としては金属材−HDPの組合せによる
ものが現在なお主流をなしている。BACKGROUND ART Hip prostheses play an effective and important role as a means for early recovery of joint functions impaired by lesions such as rheumatism and osteoarthritis, and disorders. 19
Since the artificial hip joint consisting of a combination of a stainless steel stem and a high-density polyethylene (HDP) acetabular socket, which is currently in use in 61, was put into practical use, since the sliding surface that constitutes the artificial hip joint has been composed of metal materials, The combination of HDPs is still mainstream at present.

しかしながら、かかる人工関節において、摺動面の摩
擦により伝えられるトルクによって天然骨と人工関節部
材との境界面間に緩み（ルーズニング）が生じ易く、ま
た摺動面からの摩耗粉による周辺の生体組織に対する為
害性の問題はいまだに解決されていない。However, in such artificial joints, loosening (loosening) is likely to occur between the boundary surface between the natural bone and the artificial joint member due to torque transmitted by friction of the sliding surface, and the surrounding living body due to abrasion powder from the sliding surface. The problem of harm to the organization has not yet been resolved.

一方、アルミナなどのセラミックとHDPとの組合せか
ら成る人工関節では、金属−HDPの組合せのものに比較
して摩擦、摩耗特性の面から見れば優れているものの、
天然の関節が有する摺動特性にはほど遠いものであっ
た。On the other hand, an artificial joint made of a combination of ceramic such as alumina and HDP is superior in terms of friction and wear characteristics as compared with a metal-HDP combination,
It was far from the sliding characteristics of natural joints.

〔問題点を解決するための手段〕[Means for solving the problem]

上記問題点を解決すべく、人工股関節を構成する臼蓋
ソケットに摺動する骨頭球をセラミック製とし、その表
面部に凹部を設け、該凹部中に多孔体を設し、この多孔
体に貯留せしめられた関節液を関節摺動面に効率よく配
給することにより流体膜圧力を高め、より優れた関節特
性をもった人工股関節をもたらすものである。In order to solve the above problems, a caput ball which slides on an acetabular socket constituting an artificial hip joint is made of ceramic, a concave portion is provided on the surface thereof, a porous body is provided in the concave portion, and the porous body is stored in the porous body. By efficiently distributing the impregnated synovial fluid to the joint sliding surface, the fluid film pressure is increased, and an artificial hip joint having more excellent joint characteristics is obtained.

〔実施例〕〔Example〕

以下、図によって具体的に本発明実施例を説明する。 Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

第１図には臼蓋ソケットを省略した人工股関節の斜視
図であって、Ｓはステムで、このステムＳは大腿骨の髄
腔中に挿入、固定されるもので、一般にステンレス鋼、
バイタリウム、チタン合金などで製作されている。FIG. 1 is a perspective view of an artificial hip joint in which an acetabular socket is omitted, where S is a stem, and the stem S is inserted and fixed in the medullary cavity of the femur.
It is made of Vitalium, Titanium alloy, etc.

このステムＳの先端には、不図示の臼蓋ソケットに滑
動（摺動）自在に収容される骨頭球Ｂが嵌着されてい
る。At the tip of the stem S, a head ball B which is slidably (slidably) accommodated in an acetabular socket (not shown) is fitted.

この骨頭球Ｂは、アルミナ、ジルコニアなど緻密質の
セラミック材で作られるが、このうちアルミナセラミッ
クでは、アルミニウムイオンの周りを完全に取り囲むよ
うに酸素イオンが配列されているため極めて安定で親水
性に優れ、そのため金属材に比較して摺動面において優
れた潤滑特性をもたらすことができる。This head ball B is made of a dense ceramic material such as alumina and zirconia. Among them, in alumina ceramic, oxygen ions are arranged so as to completely surround aluminum ions, so that they are extremely stable and hydrophilic. Excellent, and therefore, can provide excellent lubrication characteristics on the sliding surface as compared with the metal material.

上記骨頭球Ｂの表面近傍には複数個の凹部Ｃが要所に
設けられ、該凹部Ｃ中にはアルミナ、アパタイトなどの
多孔質体Ｅが充填されることにより微小孔が点在せしめ
てあり、また、骨頭球Ｂの表面Ｆは鏡面状に研磨されて
いる。なお、骨頭球Ｂの大きさは外径22mm,28mm程度で
凹部Ｃの孔径は１〜4mmで深さ１〜2mm,その凹部Ｃの底
部に設置する多孔質体Ｅの有する平均ポアサイズは30〜
400μｍが適当であり、しかも多孔質体Ｅの上面は表面
Ｆより低い（奥まった）位置に設置されることにより、
多孔質体Ｅの上面がソケットの摺動面を成すポリエチレ
ン表面と摺接し傷付けるのを回避する。In the vicinity of the surface of the head ball B, a plurality of concave portions C are provided at important points, and the concave portions C are filled with a porous body E such as alumina or apatite, so that micropores are dotted. The surface F of the head B is mirror-polished. The size of the cephalic ball B is about 22 mm and 28 mm in outer diameter, the hole diameter of the concave portion C is 1-4 mm, the depth is 1-2 mm, and the average pore size of the porous body E installed at the bottom of the concave portion C is 30-
400 μm is appropriate, and the upper surface of the porous body E is placed at a position lower (recessed) than the surface F,
The upper surface of the porous body E is slidably in contact with the polyethylene surface forming the sliding surface of the socket to avoid being damaged.

このように骨頭球Ｂの表面Ｆに凹部Ｃを形成し、その
中に多孔質体Ｅを設置したことから積極的に関節液を貯
留せしめる関節液を必要に応じて摺動時に放出すること
によって、鏡面研磨しただけの骨頭球よりも天然の関節
に近い優れた摩擦、摩耗特性を得ることができた。即
ち、本発明によるセラミック骨頭球Ｂを関節シミュレー
タを用いて摩擦トルクを測定したところ在来のセラミッ
ク骨頭球に比較し約20〜25％の低い結果が得られた。By forming the concave portion C on the surface F of the head ball B and placing the porous body E in the concave portion C, the synovial fluid that actively stores the synovial fluid is released as needed when sliding. As a result, it was possible to obtain excellent friction and wear characteristics closer to a natural joint than a head ball simply polished to a mirror surface. That is, when the friction torque of the ceramic head ball B according to the present invention was measured using a joint simulator, a result of about 20 to 25% lower than that of a conventional ceramic head ball was obtained.

〔発明の効果〕〔The invention's effect〕

叙上のように本発明によれば、セラミック製の骨頭球
の表面部に多孔質体により関節液が貯留されるようにし
たことから、骨頭球と臼蓋ソケットとの摺動面における
関節液による潤滑機能が向上し、摩擦、摩耗特性が優
れ、耐久性と高信頼性をもった高機能の人工股関節をも
たらし、人類の福祉向上に寄与するところ大である。As described above, according to the present invention, since the synovial fluid is stored by the porous body on the surface portion of the ceramic head ball, the synovial fluid on the sliding surface between the head head ball and the acetabular socket. The lubrication function is improved, the friction and wear characteristics are excellent, and a high-performance artificial hip joint with durability and high reliability is provided, which greatly contributes to the improvement of human welfare.

【図面の簡単な説明】[Brief description of the drawings]

第１図は本発明実施例による人工股関節の側面図、第２
図は第１図のＸ−Ｘ線部における拡大断面図である。 B:骨頭球、S:ステム、F:表面 E:多孔質体FIG. 1 is a side view of an artificial hip joint according to an embodiment of the present invention, and FIG.
The figure is an enlarged sectional view taken along line XX of FIG. B: head cap, S: stem, F: surface E: porous body

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】ステムの先端に装着され、臼蓋ソケット中
にて滑動するセラミック製の骨頭球の表面部に複数の凹
部を形成し、該凹部にセラミック製の多孔質体が装填し
てなる人工股関節。1. A plurality of recesses are formed in the surface of a ceramic head ball that is mounted on the tip of a stem and slides in an acetabular socket, and a ceramic porous body is loaded in the recess. Artificial hip joint.
JP61311187A 1986-12-27 1986-12-27 Hip prosthesis Expired - Lifetime JP2587625B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61311187A JP2587625B2 (en) 1986-12-27 1986-12-27 Hip prosthesis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61311187A JP2587625B2 (en) 1986-12-27 1986-12-27 Hip prosthesis

Publications (2)

Publication Number Publication Date
JPS63164947A JPS63164947A (en) 1988-07-08
JP2587625B2 true JP2587625B2 (en) 1997-03-05

Family

ID=18014139

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61311187A Expired - Lifetime JP2587625B2 (en) 1986-12-27 1986-12-27 Hip prosthesis

Country Status (1)

Country Link
JP (1) JP2587625B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8475505B2 (en) 2008-08-13 2013-07-02 Smed-Ta/Td, Llc Orthopaedic screws
US9358056B2 (en) 2008-08-13 2016-06-07 Smed-Ta/Td, Llc Orthopaedic implant
US9561354B2 (en) 2008-08-13 2017-02-07 Smed-Ta/Td, Llc Drug delivery implants
US9616205B2 (en) 2008-08-13 2017-04-11 Smed-Ta/Td, Llc Drug delivery implants
US9700431B2 (en) 2008-08-13 2017-07-11 Smed-Ta/Td, Llc Orthopaedic implant with porous structural member
US10842645B2 (en) 2008-08-13 2020-11-24 Smed-Ta/Td, Llc Orthopaedic implant with porous structural member

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03489A (en) * 1989-05-24 1991-01-07 Nippon Sekigaisen Kogyo Kk Cracking method and cracking device for brittle material by using laser for which concentrated thermal stress generated in work is used as heat source
US6190417B1 (en) 1999-07-19 2001-02-20 Kyocera Corporation Femoral prosthesis device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5934252A (en) * 1982-08-23 1984-02-24 有限会社友信開発 Low friction artificial joint

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8475505B2 (en) 2008-08-13 2013-07-02 Smed-Ta/Td, Llc Orthopaedic screws
US8702767B2 (en) 2008-08-13 2014-04-22 Smed-Ta/Td, Llc Orthopaedic Screws
US9358056B2 (en) 2008-08-13 2016-06-07 Smed-Ta/Td, Llc Orthopaedic implant
US9561354B2 (en) 2008-08-13 2017-02-07 Smed-Ta/Td, Llc Drug delivery implants
US9616205B2 (en) 2008-08-13 2017-04-11 Smed-Ta/Td, Llc Drug delivery implants
US9700431B2 (en) 2008-08-13 2017-07-11 Smed-Ta/Td, Llc Orthopaedic implant with porous structural member
US10349993B2 (en) 2008-08-13 2019-07-16 Smed-Ta/Td, Llc Drug delivery implants
US10357298B2 (en) 2008-08-13 2019-07-23 Smed-Ta/Td, Llc Drug delivery implants
US10842645B2 (en) 2008-08-13 2020-11-24 Smed-Ta/Td, Llc Orthopaedic implant with porous structural member
US11426291B2 (en) 2008-08-13 2022-08-30 Smed-Ta/Td, Llc Orthopaedic implant with porous structural member

Also Published As

Publication number Publication date
JPS63164947A (en) 1988-07-08

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