JPH0951907A - Artificial joint stem assembly - Google Patents

Artificial joint stem assembly

Info

Publication number
JPH0951907A
JPH0951907A JP7206196A JP20619695A JPH0951907A JP H0951907 A JPH0951907 A JP H0951907A JP 7206196 A JP7206196 A JP 7206196A JP 20619695 A JP20619695 A JP 20619695A JP H0951907 A JPH0951907 A JP H0951907A
Authority
JP
Japan
Prior art keywords
stem
artificial joint
fixed
calcium phosphate
assembly
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.)
Pending
Application number
JP7206196A
Other languages
Japanese (ja)
Inventor
Satoshi Kojima
聡 小島
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 JP7206196A priority Critical patent/JPH0951907A/en
Priority to DE1996132266 priority patent/DE19632266A1/en
Publication of JPH0951907A publication Critical patent/JPH0951907A/en
Pending legal-status Critical Current

Links

Classifications

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    • 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
    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/02—Inorganic materials
    • A61L27/12—Phosphorus-containing materials, e.g. apatite
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    • 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
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    • 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
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    • 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
    • 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
    • A61F2220/0041—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws
    • 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
    • A61F2220/005—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using adhesives
    • 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
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • A61F2230/0006—Rounded shapes, e.g. with rounded corners circular
    • 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
    • A61F2230/0026—Angular shapes trapezoidal
    • 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
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0019—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in hardness, e.g. Vickers, Shore, Brinell
    • 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
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00179—Ceramics or ceramic-like structures
    • A61F2310/00293—Ceramics or ceramic-like structures containing a phosphorus-containing compound, e.g. apatite

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Engineering & Computer Science (AREA)
  • Vascular Medicine (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Biomedical Technology (AREA)
  • Cardiology (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Dermatology (AREA)
  • Medicinal Chemistry (AREA)
  • Epidemiology (AREA)
  • Prostheses (AREA)
  • Materials For Medical Uses (AREA)

Abstract

(57)【要約】 【目的】 人工関節のステムの人骨への固定性、特に長
期の固定性を改良する。 【構成】 一端部に球状体の固定部を有し、人骨内に埋
め込まれる人工関節のステムにおいて、ステムとは別部
材として、リン酸カルシウム系化合物の焼結体または硬
化体からなるステムパーツを設け、ステムには、このス
テムパーツの収容固定部を設け、この収容固定部に、ス
テムパーツを外面に露出させた状態で固定した人工関節
のステムアッセンブリ。 (57) [Summary] [Purpose] To improve the fixation of the stem of the artificial joint to the human bone, especially the long-term fixation. In a stem of an artificial joint having a spherical fixing part at one end and embedded in a human bone, a stem part made of a sintered body or a hardened body of a calcium phosphate compound is provided as a member separate from the stem, A stem assembly for an artificial joint in which the stem is provided with a housing fixing part for the stem part, and the stem part is fixed to the housing fixing part while being exposed to the outer surface.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【技術分野】本発明は、人工関節のステムアッセンブリ
に関する。TECHNICAL FIELD The present invention relates to a stem assembly for an artificial joint.

【０００２】[0002]

【従来技術およびその問題点】股関節（肩関節）は、ほ
ぼ完全な球形をした大腿骨頭（上腕骨頭）と、この大腿
骨等の約２／３が嵌まり込んでいる深いお椀型の寛骨臼
窩からなっている。人工股関節（人工肩関節）は、大腿
骨頭の代替品としてのセラミックス材料からなる球状体
を、金属材料からなるステムの上端部に設けて、このス
テムを大腿骨（上腕骨）内に埋込固定し、他方、寛骨臼
窩の代替品としての金属材料、または金属と合成樹脂材
料の複合材料から形成した半球状お椀を腰骨（肩甲骨）
内に埋込固定するという基本構造を有する。2. Description of the Related Art: The hip joint (shoulder joint) has a substantially perfect spherical femoral head (humeral head) and a deep bowl-shaped hip bone into which about 2/3 of the femur is fitted. It consists of mortars. In the artificial hip joint (artificial shoulder joint), a spherical body made of a ceramic material, which is a substitute for the femoral head, is provided at the upper end of a stem made of a metal material, and the stem is embedded and fixed in the femur (humerus). On the other hand, a hemispherical bowl made of a metal material as a substitute for the acetabular fossa or a composite material of a metal and a synthetic resin material is used as a hip bone (scapula).
It has the basic structure of being embedded and fixed inside.

【０００３】この人工関節では、人骨へのステムの固定
方法として従来、セメント法とセメントレス法とが知ら
れている。セメント法は、大体骨に穿けた穴と、この穴
に挿入したステムとの間に何らかのセメント（接着剤）
を挿入して両者を固定する方法で、初期固定性には優れ
るが、長期の固定性には問題があり緩みが生じることが
ある。またＰＭＭＡ（ポリメチルメタクリレート）セメ
ントのモノマーによる感染の問題もある。一方、セメン
トレス法は、セメントを使用せず、金属表面（ステム）
にチタン溶射等その他の方法で凹凸をつけ、ここに骨を
誘導し固定する方法である。しかし、初期固定性がない
ことから術後長期の安静を必要とする。また、ステムの
表面に予め生体親和性の材料、例えばアパタイトを溶射
してコーティングし、このアパタイトと人骨との癒着性
に期待する方法も知られている。この方法は、セメント
レス法に比べ初期固定性には優れているが、実際には溶
射によるアパタイト層は、結晶性が低く溶解性が高いと
いう性質を持つため、アパタイト層が時間の経過ととも
に消失し、期待した長期の固定性が得られないという問
題があった。In this artificial joint, the cement method and the cementless method are conventionally known as methods for fixing the stem to the human bone. The cement method is a kind of cement (adhesive) between the hole drilled in the bone and the stem inserted in this hole.
It is a method of inserting both and fixing them, but the initial fixing property is excellent, but there is a problem in long-term fixing property and loosening may occur. There is also a problem of infection caused by PMMA (polymethylmethacrylate) cement monomer. On the other hand, the cementless method does not use cement, but uses a metal surface (stem).
It is a method of guiding and fixing bones here by making unevenness by other methods such as titanium spraying. However, since there is no initial fixation, long-term rest after surgery is required. Further, a method is also known in which a biocompatible material such as apatite is sprayed and coated on the surface of the stem in advance, and the adhesion between the apatite and a human bone is expected. This method is superior to the cementless method in terms of initial fixation, but in reality, the apatite layer formed by thermal spraying has the property of low crystallinity and high solubility, so the apatite layer disappears over time. However, there was a problem that the expected long-term fixability could not be obtained.

【０００４】[0004]

【発明の目的】本発明は、人工関節のステムの人骨への
固定性についての以上の問題を解決し、特に長期の固定
性を改良することを目的とする。OBJECTS OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems concerning the fixation of the stem of the artificial joint to the human bone, and particularly to improve the fixation in the long term.

【０００５】[0005]

【発明の概要】本発明は、リン酸カルシウム系化合物の
化学的な安定性と低い溶解性に着目し、これをステムの
表面に露出させて固定するという着想に基づいて完成さ
れたものである。すなわち本発明の人工関節のステムア
ッセンブリは、一端部に球状体の固定部を有し、人骨内
に埋め込まれる人工関節のステムにおいて、ステムとは
別部材として、リン酸カルシウム系化合物の焼結体また
は硬化体からなるステムパーツを設け、ステムには、こ
のステムパーツの収容固定部を設け、この収容固定部
に、ステムパーツを外面に露出させた状態で固定したこ
とを特徴としている。このステムアッセンブリは、化学
的な安定性と低い溶解性を有するリン酸カルシウム系化
合物が、焼結体または硬化体として、ステムとは別部材
からなるステムパーツとして構成されていて、表面に露
出する態様でステムの収容固定部に固定されているため
に、人骨（大腿骨、肩甲骨）との優れた癒着性が得ら
れ、長期の固定性に優れる。SUMMARY OF THE INVENTION The present invention has been completed based on the idea of focusing on the chemical stability and low solubility of a calcium phosphate-based compound and exposing and fixing it on the surface of the stem. That is, the stem assembly of the artificial joint of the present invention has a spherical fixing portion at one end, and in the stem of the artificial joint to be embedded in the human bone, as a member separate from the stem, a sintered body of a calcium phosphate-based compound or a hardened body. The present invention is characterized in that a stem part composed of a body is provided, the stem is provided with a housing fixing portion for the stem part, and the stem part is fixed to the housing fixing portion while being exposed to the outer surface. In this stem assembly, a calcium phosphate compound having chemical stability and low solubility is formed as a sintered body or a hardened body as a stem part made of a member different from the stem, and exposed on the surface. Since it is fixed to the housing fixing portion of the stem, excellent adhesion with human bones (femur, scapula) is obtained, and long-term fixation is excellent.

【０００６】ステムパーツは、具体的には例えば、リン
酸カルシウム系化合物の焼結体または硬化体からなる板
状体から構成し、ステムの収容固定部は、この板状体を
収容し接着剤で固定する有底凹部から構成することがで
きる。ステムパーツはまた、リン酸カルシウム系化合物
の焼結体または硬化体からなるブロックから構成し、ス
テムの収容固定部は、このブロックを収容する貫通穴か
ら構成することができる。このブロックは、接着剤で貫
通穴に固定すると同時に、固定ピンを用いてステムに固
定することができる。ステムパーツの別の形態として、
リン酸カルシウム系化合物の焼結体または硬化体からな
る筒状体から構成し、ステムの収容固定部は、この筒状
体内に挿入されステムの端部に固定される有頭固定ピン
とすることができる。ステムパーツとステムは、人骨に
形成する穴への挿入性を考慮すれば、全体として滑らか
な表面を形成していることが好ましい。Specifically, the stem part is composed of, for example, a plate-shaped body made of a sintered body or a cured body of a calcium phosphate-based compound, and the stem housing / fixing portion houses the plate-shaped body and is fixed with an adhesive. It can be configured by a bottomed recessed portion. The stem part may be composed of a block made of a sintered body or a hardened body of a calcium phosphate-based compound, and the housing fixing portion may be composed of a through hole for housing this block. This block can be fixed to the through hole at the same time with an adhesive, and can be fixed to the stem using a fixing pin. As another form of stem parts,
The stem accommodating and fixing portion may be a headed fixing pin that is formed by a cylindrical body made of a sintered body or a cured body of a calcium phosphate-based compound, and is inserted into the cylindrical body and fixed to the end portion of the stem. Considering the insertability into the hole formed in the human bone, the stem parts and the stem preferably form a smooth surface as a whole.

【０００７】本発明のステムパーツに使用しうるリン酸
カルシウム系化合物としては、ハイドロキシアパタイ
ト、フッ素アパタイト等の各種のアパタイト、第一リン
酸カルシウム系化合物、第二リン酸カルシウム系化合
物、リン酸三カルシウム、リン酸四カルシウムなどが挙
げられ、これらは単独で又は混合物として使用すること
ができる。さらに具体的には、これらのリン酸カルシウ
ム系化合物粉体から所望の形状及び寸法を有する圧粉体
を作製し、これを焼結して、相対密度３０〜１００％、
好ましくは４０〜８０％の焼結体として用いるか、水硬
性リン酸カルシウム系化合物を硬化させて硬化体として
用いる。焼結体において相対密度が３０％未満である
と、強度が十分でない。また、相対密度が小さい多孔質
のものの方が骨伝導性には優れるが、相対密度１００％
の緻密質でも特別な問題はない。Examples of the calcium phosphate-based compound that can be used in the stem part of the present invention include various apatites such as hydroxyapatite, fluoroapatite, monocalcium phosphate-based compounds, dicalcium phosphate-based compounds, tricalcium phosphate, and tetracalcium phosphate. Etc., which can be used alone or as a mixture. More specifically, a powder compact having a desired shape and dimensions is prepared from these calcium phosphate compound powders, and the powder compact is sintered to obtain a relative density of 30 to 100%,
Preferably, it is used as a sintered body of 40 to 80% or is used as a hardened body by hardening a hydraulic calcium phosphate compound. If the relative density of the sintered body is less than 30%, the strength is insufficient. In addition, a porous material having a small relative density is superior in osteoconductivity, but a relative density of 100%
There is no special problem with the precise quality of.

【０００８】[0008]

【発明の実施の形態】以下図示実施態様について本発明
を説明する。図９は、本発明を人工股関節に適用した概
念図である。腰骨１１には、金属材料、または金属と合
成樹脂材料との複合材料からなる半球状お椀１２が埋込
固定され、大腿骨１３に穿けた穴１４には、本発明の対
象とするステムアッセンブリ２０が埋込固定されてい
る。ステムアッセンブリ２０の上端部には、通常セラミ
ックス材料からなる球状体２１が固定され、この球状体
２１が半球状お椀１２の凹球面１２ａに回動自在に支持
される。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the embodiments shown in the drawings. FIG. 9 is a conceptual diagram in which the present invention is applied to an artificial hip joint. A hemispherical bowl 12 made of a metal material or a composite material of a metal and a synthetic resin material is embedded and fixed in the hip bone 11, and a stem assembly 20 as a target of the present invention is provided in a hole 14 formed in the femur 13. Is embedded and fixed. A spherical body 21 usually made of a ceramic material is fixed to the upper end of the stem assembly 20, and the spherical body 21 is rotatably supported by the concave spherical surface 12a of the hemispherical bowl 12.

【０００９】図１ないし図３は、本発明によるステムア
ッセンブリ２０の第１の実施例を示す。本発明のステム
アッセンブリ２０は、金属材料、例えばチタンからなる
ステム２２と、このステム２２とは別部材からなり該ス
テム２２に固定される、リン酸カルシウム系化合物の焼
結体または硬化体からなる板状のステムパーツ２３とか
らなっている。ステム２２は、大腿骨１３への埋込部２
２ａの上端部（図１の左端部）から、側方に突出する球
状体固定部２２ｂを突出させた形状をしている。このス
テム２２の埋込部２２ａには、その両側面に、ステムパ
ーツ２３を収容固定する有底凹部２４が形成されてい
る。板状のステムパーツ２３と有底凹部２４は、その平
面形状及び厚さ（深さ）がほぼ一致していて、ステムパ
ーツ２３を有底凹部２４に嵌めると、ステムアッセンブ
リ２０は全体として滑らかな表面を構成する。ステムパ
ーツ２３は接着剤を用いて有底凹部２４に固定される。1 to 3 show a first embodiment of a stem assembly 20 according to the present invention. The stem assembly 20 of the present invention is a plate-like body made of a metal material such as titanium and a stem 22 made of a member different from the stem 22 and fixed to the stem 22 and made of a sintered body or a hardened body of a calcium phosphate compound. It consists of the stem part 23 of. The stem 22 is the implant part 2 in the femur 13.
It has a shape in which a spherical body fixing portion 22b protruding laterally is projected from the upper end portion (left end portion in FIG. 1) of 2a. The embedded portion 22a of the stem 22 has bottomed recesses 24 for accommodating and fixing the stem parts 23 on both side surfaces thereof. The planar shape and the thickness (depth) of the plate-shaped stem part 23 and the bottomed recess 24 are substantially the same, and when the stem part 23 is fitted into the bottomed recess 24, the stem assembly 20 becomes smooth as a whole. Make up the surface. The stem part 23 is fixed to the bottomed recess 24 using an adhesive.

【００１０】図４、図５は、本発明によるステムアッセ
ンブリ２０の第２の実施例を示す。この実施例は、第１
の実施例の構成に加え、ステム２２の埋込部２２ａの先
端にも、リン酸カルシウム系化合物の焼結体または硬化
体からなる別のステムパーツ２５を固定したものであ
る。ステムパーツ２５は、筒状体からなっていて、この
ステムパーツ２５は、有頭固定ピン２６によって、埋込
部２２ａの端部に固定されている。有頭固定ピン２６
は、ステムパーツ２５に挿入される軸部２６ａの両側
に、ねじ部２６ｂと、軸部２６ａより大径の頭部２６ｃ
とを一体に設けたもので、ねじ部２６ｂを埋込部２２ａ
に螺合することにより、ステムパーツ２５がステム２２
の端部に固定される。ねじ部２６ｂは、ステム２２に接
着される非ねじ軸に代えてもよい。ステムパーツ２５は
ステム２２と滑らかな表面を構成している。4 and 5 show a second embodiment of the stem assembly 20 according to the present invention. This embodiment is the first
In addition to the configuration of the embodiment, another stem part 25 made of a sintered body or a hardened body of a calcium phosphate compound is fixed to the tip of the embedded portion 22a of the stem 22. The stem part 25 is formed of a tubular body, and the stem part 25 is fixed to the end of the embedded portion 22a by a headed fixing pin 26. Headed fixed pin 26
On both sides of the shaft portion 26a inserted into the stem part 25, a screw portion 26b and a head portion 26c having a diameter larger than that of the shaft portion 26a.
And the screw portion 26b are embedded in the embedded portion 22a.
By screwing the stem part 25 into the stem 22
Is fixed to the end. The threaded portion 26b may be replaced with a non-threaded shaft that is bonded to the stem 22. The stem part 25 forms a smooth surface with the stem 22.

【００１１】図６ないし図８は、本発明によるステムア
ッセンブリ２０の第３の実施例を示す。この実施例は、
ステム２２の埋込部２２ａに、貫通穴２７を穿け、この
貫通穴２７に、ステム２２とは別体でリン酸カルシウム
系化合物の焼結体または硬化体からなるステムパーツ２
８を挿入固定したものである。埋込部２２ａとステムパ
ーツ２８には、固定ピンの挿入孔２９、２８ａが穿設さ
れ、この挿入孔に渡らせて、固定ピン３０が挿入されて
いる。ステムパーツ２８の固定には、接着剤を併用する
ことができる。ステムパーツ２８はステム２２と滑らか
な表面を構成している。FIGS. 6-8 show a third embodiment of a stem assembly 20 according to the present invention. This example is
A through hole 27 is formed in the embedded portion 22a of the stem 22, and the stem part 2 which is a separate body from the stem 22 and is made of a sintered body or a hardened body of a calcium phosphate compound is formed in the through hole 27.
8 is inserted and fixed. Fixing pin insertion holes 29 and 28a are formed in the embedded portion 22a and the stem part 28, and a fixing pin 30 is inserted across the insertion holes. An adhesive can be used together to fix the stem part 28. The stem part 28 forms a smooth surface with the stem 22.

【００１２】上記構成のステムアッセンブリ２０は、大
腿骨１３に形成した穴１４に挿入され固定される。固定
には、接着、機械的固定、あるいは単なる嵌め込み等の
手段を用いることができる。術後時間が経過するにつれ
て、リン酸カルシウム系化合物からなるステムパーツ２
３、２５、２８の微細孔内にやがて骨が導かれ、リン酸
カルシウム系化合物の持つ優れた生体親和性により大腿
骨１３と強固に接合される。リン酸カルシウム系化合物
は本来化学的に安定で溶解性が低く、しかもリン酸カル
シウム系化合物からなるステムパーツは、ステムとは別
部材からなっているから、骨への埋設後、容易に消失す
ることがない。The stem assembly 20 having the above structure is inserted and fixed in the hole 14 formed in the femur 13. For fixing, means such as adhesion, mechanical fixing, or simple fitting can be used. Stem parts 2 consisting of calcium phosphate compounds as the postoperative time passes
Bone is eventually introduced into the fine pores of 3, 25, 28, and is firmly joined to the femur 13 due to the excellent biocompatibility of the calcium phosphate compound. The calcium phosphate compound is inherently chemically stable and has low solubility, and since the stem part made of the calcium phosphate compound is a member separate from the stem, it does not easily disappear after being embedded in bone.

【００１３】本発明は、ステムパーツ２３、２５、２８
の成形方法を問うものではないが、次にこれらをハイド
ロキシアパタイトを原料として焼結体として製造する場
合、及び硬化体とし製造する場合の具体的な例を説明す
る。In the present invention, the stem parts 23, 25, 28 are used.
No particular limitation is imposed on the molding method, but a specific example of the case where these are produced as a sintered body using hydroxyapatite as a raw material and the case where they are produced as a cured body will be described.

【００１４】製造例１ 公知の方法でハイドロキシアパタイトスラリーを湿式合
成した。このスラリーをスプレードライヤで乾燥し、ハ
イドロキシアパタイト粉末を得た。得られた粉末を金型
プレスし、所要形状の圧粉体を作製した。圧粉体を焼成
収縮分を考慮してＮＣ旋盤で所望の寸法形状に加工し、
電気炉内で１１００℃で２時間焼成し、ステムパーツ２
３、２５、２８を得た。Production Example 1 Hydroxyapatite slurry was wet-synthesized by a known method. This slurry was dried with a spray dryer to obtain a hydroxyapatite powder. The obtained powder was pressed with a die to produce a green compact having a required shape. The green compact is processed into a desired size and shape with an NC lathe in consideration of the amount of shrinkage during firing.
Stem part 2 after firing in an electric furnace at 1100 ° C for 2 hours
3, 25, 28 were obtained.

【００１５】製造例２ リン酸水溶液と水酸化カルシウムの懸濁液を公知の方法
で反応させ、乾燥させてＣａ／Ｐ比１．６７のハイドロ
キシアパタイトを得た。このハイドロキシアパタイトを
温度１２００℃、圧力１．３×１０-4Ｐａで１時間焼成
した。その結果、ハイドロキシアパタイトの熱分解によ
って生じたα−リン酸三カルシウムとリン酸四カルシウ
ムの混合物を得た。このようにして得られたα−リン酸
三カルシウムとリン酸四カルシウムの混合物を粉剤と
し、クエン酸４５％、グルコース１５％、キトサン１％
を含む水溶液と、粉液比２：１で練和した。この練和物
を所望形状の型に入れて硬化させ、約１０分後完全硬化
した後に型から取り出し、ステムパーツ２３、２５、２
８を得た。このようにして得られたステムパーツは、別
途形成しておいたステム２２に各実施例に記載の方法で
固定され、ステムアッセンブリ２０が得られた。Production Example 2 Hydroxyapatite having a Ca / P ratio of 1.67 was obtained by reacting an aqueous solution of phosphoric acid and a suspension of calcium hydroxide by a known method and drying. This hydroxyapatite was calcined at a temperature of 1200 ° C. and a pressure of 1.3 × 10 −4 Pa for 1 hour. As a result, a mixture of α-tricalcium phosphate and tetracalcium phosphate produced by thermal decomposition of hydroxyapatite was obtained. The mixture of α-tricalcium phosphate and tetracalcium phosphate thus obtained was used as a powder, and citric acid 45%, glucose 15%, chitosan 1%
The mixture was kneaded with an aqueous solution containing 2: 1 at a powder / liquid ratio of 2: 1. The kneaded product is put into a mold having a desired shape and cured, and after about 10 minutes, it is completely cured, and then taken out from the mold.
Got 8. The stem parts thus obtained were fixed to the separately formed stem 22 by the method described in each example, and the stem assembly 20 was obtained.

【００１６】[0016]

【発明の効果】以上のように本発明の人工関節のステム
アッセンブリは、ステムとは別部材からなるステムパー
ツが化学的な安定性と低い溶解性を有するリン酸カルシ
ウム系化合物の焼結体または硬化体からなり、これが表
面に露出する態様でステムの収容固定部に固定されてい
るから、人骨に埋入したとき、骨との優れた癒着性が得
られ、長期の固定性に優れる。As described above, in the stem assembly of the artificial joint of the present invention, the stem part made of a member different from the stem has a chemical stability and a low solubility, and is a sintered body or a hardened body of a calcium phosphate compound. Since it is fixed to the accommodating and fixing portion of the stem in such a manner that it is exposed on the surface, when it is embedded in human bone, it has excellent adhesion to bone and is excellent in long-term fixation.

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

【図１】本発明による人工関節のステムの第１の実施例
を示す正面図である。FIG. 1 is a front view showing a first embodiment of a stem of an artificial joint according to the present invention.

【図２】図１の平面図である。FIG. 2 is a plan view of FIG.

【図３】リン酸カルシウム系化合物プレート単体の斜視
図である。FIG. 3 is a perspective view of a single calcium phosphate-based compound plate.

【図４】本発明による人工関節のステムの第２の実施例
を示す正面図である。FIG. 4 is a front view showing a second embodiment of the stem of the artificial joint according to the present invention.

【図５】図４のＶ−Ｖ線に沿う断面図である。FIG. 5 is a sectional view taken along line VV in FIG. 4;

【図６】本発明による人工関節のステムの第３の実施例
を示す正面図である。FIG. 6 is a front view showing a third embodiment of the stem of the artificial joint according to the present invention.

【図７】図６の平面図である。FIG. 7 is a plan view of FIG. 6;

【図８】リン酸カルシウム系化合物ブロック単体の斜視
図である。FIG. 8 is a perspective view of a single calcium phosphate compound block.

【図９】人工股関節の概念図である。FIG. 9 is a conceptual diagram of an artificial hip joint.

【符号の説明】[Explanation of symbols]

１１ 腰骨 １２ 半球状お椀 １３ 大腿骨 ２０ ステムアッセンブリ ２１ 球状体 ２２ ステム ２２ａ 埋込部 ２２ｂ 球状体固定部 ２３ ステムパーツ（板状体） ２４ 有底凹部 ２５ ステムパーツ（筒状体） ２６ 有頭固定ピン ２７ 貫通穴 ２８ ステムパーツ（ブロック） 11 Hip bone 12 Hemispherical bowl 13 Femur 20 Stem assembly 21 Spherical body 22 Stem 22a Embedded part 22b Spherical body fixing part 23 Stem part (plate body) 24 Bottomed recess 25 Stem part (cylindrical body) 26 Headed fixation Pin 27 Through hole 28 Stem parts (block)

Claims (6)

【特許請求の範囲】[Claims] 【請求項１】 一端部に球状体の固定部を有し、人骨内
に埋め込まれる人工関節のステムにおいて、 上記ステムとは別部材として、リン酸カルシウム系化合
物の焼結体または硬化体からなるステムパーツを設け、 上記ステムに、このステムパーツの収容固定部を設け、 この収容固定部に、上記ステムパーツを外面に露出させ
た状態で固定したことを特徴とする人工関節のステムア
ッセンブリ。1. A stem of an artificial joint having a spherical fixing part at one end, which is embedded in a human bone, as a member different from the above-mentioned stem, the stem part being made of a sintered body or a hardened body of a calcium phosphate compound. A stem assembly for an artificial joint, wherein the stem is provided with a housing fixing portion for the stem part, and the stem fixing portion is fixed to the housing fixing portion while being exposed to the outer surface. 【請求項２】 請求項１において、ステムパーツは、リ
ン酸カルシウム系化合物の焼結体または硬化体からなる
板状体からなり、ステムの収容固定部は、この板状体を
収容し接着剤で固定する有底凹部である人工関節のステ
ムアッセンブリ。2. The stem part according to claim 1, which is a plate-shaped body made of a sintered body or a hardened body of a calcium phosphate-based compound, and an accommodating and fixing portion of the stem accommodates the plate-shaped body and is fixed with an adhesive. A stem assembly for an artificial joint, which is a bottomed recess. 【請求項３】 請求項１において、ステムパーツは、リ
ン酸カルシウム系化合物の焼結体または硬化体からなる
ブロックからなり、ステムの収容固定部は、このブロッ
クを収容する貫通穴である人工関節のステムアッセンブ
リ。3. The stem of an artificial joint according to claim 1, wherein the stem part is a block made of a sintered body or a hardened body of a calcium phosphate-based compound, and the stem housing / fixing portion is a through hole for housing the block. Assembly. 【請求項４】 請求項３において、ブロックからなるス
テムパーツは、固定ピンによって、ステムの貫通穴に固
定されている人工関節のステムアッセンブリ。4. The stem assembly for an artificial joint according to claim 3, wherein the stem part made of a block is fixed to a through hole of the stem by a fixing pin. 【請求項５】 請求項１において、ステムパーツは、リ
ン酸カルシウム系化合物の焼結体または硬化体からなる
筒状体であり、ステムの収容固定部は、この筒状体内に
挿入されステムの端部に固定される有頭固定ピンである
人工関節のステムアッセンブリ。5. The stem part according to claim 1, which is a tubular body made of a sintered body or a hardened body of a calcium phosphate-based compound, and the stem holding and fixing portion is inserted into the tubular body, and an end portion of the stem is inserted. Stem assembly of artificial joint which is a fixed pin with a head fixed to the. 【請求項６】 請求項１ないし５のいずれか１項におい
て、ステムパーツとステムは、全体として滑らかな表面
を形成している人工関節のステムアッセンブリ。6. The stem assembly of an artificial joint according to claim 1, wherein the stem part and the stem form a smooth surface as a whole.
JP7206196A 1995-08-11 1995-08-11 Artificial joint stem assembly Pending JPH0951907A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP7206196A JPH0951907A (en) 1995-08-11 1995-08-11 Artificial joint stem assembly
DE1996132266 DE19632266A1 (en) 1995-08-11 1996-08-09 Artificial joint for bones - contains calcium phosphate cpd. shaft section fixed into shaft body and lying exposed on the surface of this body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7206196A JPH0951907A (en) 1995-08-11 1995-08-11 Artificial joint stem assembly

Publications (1)

Publication Number Publication Date
JPH0951907A true JPH0951907A (en) 1997-02-25

Family

ID=16519393

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7206196A Pending JPH0951907A (en) 1995-08-11 1995-08-11 Artificial joint stem assembly

Country Status (2)

Country Link
JP (1) JPH0951907A (en)
DE (1) DE19632266A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999066865A1 (en) * 1998-06-22 1999-12-29 Anatoly Dosta Base of a cement-free endoprosthesis for the hip joint
FR2793675B1 (en) * 1999-05-19 2001-08-17 Ile Octophoron Soc Civ SET OF FEMALE RODS
DE102007031663A1 (en) * 2006-08-04 2008-02-21 Ceramtec Ag Innovative Ceramic Engineering Asymmetrical design of prosthetic components for manipulation and suppression of natural frequencies

Also Published As

Publication number Publication date
DE19632266A1 (en) 1997-02-13

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